Version bump to 1.28.0

Update short-fn to fix #1123
Symbols are renamed on expansion to avoid the issue.
2025-10-29 06:37:41 +00:00 · 2023-05-13 09:59:55 -05:00 · 2023-05-13 09:44:30 -05:00 · 2023-05-12 19:08:35 -05:00 · 2023-05-12 19:08:26 -05:00 · 2023-05-12 08:41:54 -05:00
44 changed files with 1061 additions and 330 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,35 @@
 # Changelog
 All notable changes to this project will be documented in this file.

-## ??? - Unreleased
- Add build-time detection for cygwin.
+## 1.28.0 - 2023-05-13
+- Various bug fixes
+- Make nested short-fn's behave a bit more predictably (it is still not recommended to nest short-fns).
+- Add `os/strftime` for date formatting.
+- Fix `ev/select` on threaded channels sometimes live-locking.
+- Support the `NO_COLOR` environment variable to turn off VT100 color codes in repl (and in scripts).
+  See http://no-color.org/
+- Disallow using `(splice x)` in contexts where it doesn't make sense rather than silently coercing to `x`.
+  Instead, raise a compiler error.
+- Change the names of `:user8` and `:user9` sigals to `:interrupt` and `:await`
+- Change the names of `:user8` and `:user9` fiber statuses to `:interrupted` and `:suspended`.
+- Add `ev/all-tasks` to see all currently suspended fibers.
+- Add `keep-syntax` and `keep-syntax!` functions to make writing macros easier.
+
+## 1.27.0 - 2023-03-05
+- Change semantics around bracket tuples to no longer be equal to regular tuples.
+- Add `index` argument to `ffi/write` for symmetry with `ffi/read`.
+- Add `buffer/push-at`
+- Add `ffi/pointer-buffer` to convert pointers to buffers the cannot be reallocated. This
+  allows easier manipulation of FFI memory, memory mapped files, and buffer memory shared between threads.
+- Calling `ev/cancel` on a fiber waiting on `ev/gather` will correctly
+  cancel the child fibers.
+- Add `(sandbox ...)` function to core for permission based security. Also add `janet_sandbox` to C API.
+  The sandbox allows limiting access to the file system, network, ffi, and OS resources at runtime.
+- Add `(.locals)` function to debugger to see currently bound local symbols.
+- Track symbol -> slot mapping so debugger can get symbolic information. This exposes local bindings
+  in `debug/stack` and `disasm`.
+- Add `os/compiler` to detect what host compiler was used to compile the interpreter
+- Add support for mingw and cygwin builds (mingw support also added in jpm).

 ## 1.26.0 - 2023-01-07
 - Add `ffi/malloc` and `ffi/free`. Useful as tools of last resort.
--- a/32
+++ b/32
@@ -31,6 +31,7 @@ LIBDIR?=$(PREFIX)/lib
 JANET_BUILD?="\"$(shell git log --pretty=format:'%h' -n 1 2> /dev/null || echo local)\""
 CLIBS=-lm -lpthread
 JANET_TARGET=build/janet
+JANET_BOOT=build/janet_boot
 JANET_IMPORT_LIB=build/janet.lib
 JANET_LIBRARY=build/libjanet.so
 JANET_STATIC_LIBRARY=build/libjanet.a
@@ -47,6 +48,7 @@ HOSTCC?=$(CC)
 HOSTAR?=$(AR)
 CFLAGS?=-O2
 LDFLAGS?=-rdynamic
+RUN:=$(RUN)

 COMMON_CFLAGS:=-std=c99 -Wall -Wextra -Isrc/include -Isrc/conf -fvisibility=hidden -fPIC
 BOOT_CFLAGS:=-DJANET_BOOTSTRAP -DJANET_BUILD=$(JANET_BUILD) -O0 -g $(COMMON_CFLAGS)
@@ -56,7 +58,7 @@ BUILD_CFLAGS:=$(CFLAGS) $(COMMON_CFLAGS)
 LDCONFIG:=ldconfig "$(LIBDIR)"

 # Check OS
-UNAME:=$(shell uname -s)
+UNAME?=$(shell uname -s)
 ifeq ($(UNAME), Darwin)
 	CLIBS:=$(CLIBS) -ldl
 	SONAME_SETTER:=-Wl,-install_name,
@@ -82,6 +84,8 @@ endif
 ifeq ($(findstring MINGW,$(UNAME)), MINGW)
 	CLIBS:=-lws2_32 -lpsapi -lwsock32
 	LDFLAGS:=-Wl,--out-implib,$(JANET_IMPORT_LIB)
+	JANET_TARGET:=$(JANET_TARGET).exe
+	JANET_BOOT:=$(JANET_BOOT).exe
 endif

 $(shell mkdir -p build/core build/c build/boot)
@@ -163,12 +167,12 @@ $(JANET_BOOT_OBJECTS): $(JANET_BOOT_HEADERS)
 build/%.boot.o: src/%.c $(JANET_HEADERS) $(JANET_LOCAL_HEADERS) Makefile
 	$(CC) $(BOOT_CFLAGS) -o $@ -c $<

-build/janet_boot: $(JANET_BOOT_OBJECTS)
+$(JANET_BOOT): $(JANET_BOOT_OBJECTS)
 	$(CC) $(BOOT_CFLAGS) -o $@ $(JANET_BOOT_OBJECTS) $(CLIBS)

 # Now the reason we bootstrap in the first place
-build/c/janet.c: build/janet_boot src/boot/boot.janet
-	build/janet_boot . JANET_PATH '$(JANET_PATH)' > $@
+build/c/janet.c: $(JANET_BOOT) src/boot/boot.janet
+	$(RUN) $(JANET_BOOT) . JANET_PATH '$(JANET_PATH)' > $@
 	cksum $@

 ########################
@@ -176,16 +180,16 @@ build/c/janet.c: build/janet_boot src/boot/boot.janet
 ########################

 ifeq ($(UNAME), Darwin)
-SONAME=libjanet.1.26.dylib
+SONAME=libjanet.1.28.dylib
 else
-SONAME=libjanet.so.1.26
+SONAME=libjanet.so.1.28
 endif

 build/c/shell.c: src/mainclient/shell.c
 	cp $< $@

 build/janet.h: $(JANET_TARGET) src/include/janet.h $(JANETCONF_HEADER)
-	./$(JANET_TARGET) tools/patch-header.janet src/include/janet.h $(JANETCONF_HEADER) $@
+	$(RUN) ./$(JANET_TARGET) tools/patch-header.janet src/include/janet.h $(JANETCONF_HEADER) $@

 build/janetconf.h: $(JANETCONF_HEADER)
 	cp $< $@
@@ -214,7 +218,7 @@ $(JANET_STATIC_LIBRARY): build/janet.o build/shell.o
 TEST_SCRIPTS=$(wildcard test/suite*.janet)

 repl: $(JANET_TARGET)
-	./$(JANET_TARGET)
+	$(RUN) ./$(JANET_TARGET)

 debug: $(JANET_TARGET)
 	$(DEBUGGER) ./$(JANET_TARGET)
@@ -225,8 +229,8 @@ valgrind: $(JANET_TARGET)
 	$(VALGRIND_COMMAND) ./$(JANET_TARGET)

 test: $(JANET_TARGET) $(TEST_PROGRAMS)
-	for f in test/suite*.janet; do ./$(JANET_TARGET) "$$f" || exit; done
-	for f in examples/*.janet; do ./$(JANET_TARGET) -k "$$f"; done
+	for f in test/suite*.janet; do $(RUN) ./$(JANET_TARGET) "$$f" || exit; done
+	for f in examples/*.janet; do $(RUN) ./$(JANET_TARGET) -k "$$f"; done

 valtest: $(JANET_TARGET) $(TEST_PROGRAMS)
 	for f in test/suite*.janet; do $(VALGRIND_COMMAND) ./$(JANET_TARGET) "$$f" || exit; done
@@ -265,7 +269,7 @@ build/janet-%.tar.gz: $(JANET_TARGET) \
 docs: build/doc.html

 build/doc.html: $(JANET_TARGET) tools/gendoc.janet
-	$(JANET_TARGET) tools/gendoc.janet > build/doc.html
+	$(RUN) $(JANET_TARGET) tools/gendoc.janet > build/doc.html

 ########################
 ##### Installation #####
@@ -281,7 +285,7 @@ build/janet.pc: $(JANET_TARGET)
 	echo "Name: janet" >> $@
 	echo "Url: https://janet-lang.org" >> $@
 	echo "Description: Library for the Janet programming language." >> $@
-	$(JANET_TARGET) -e '(print "Version: " janet/version)' >> $@
+	$(RUN) $(JANET_TARGET) -e '(print "Version: " janet/version)' >> $@
 	echo 'Cflags: -I$${includedir}' >> $@
 	echo 'Libs: -L$${libdir} -ljanet' >> $@
 	echo 'Libs.private: $(CLIBS)' >> $@
@@ -321,7 +325,7 @@ install-jpm-git: $(JANET_TARGET)
 		JANET_HEADERPATH='$(INCLUDEDIR)/janet' \
 		JANET_BINPATH='$(BINDIR)' \
 		JANET_LIBPATH='$(LIBDIR)' \
-		../../$(JANET_TARGET) ./bootstrap.janet
+		$(RUN) ../../$(JANET_TARGET) ./bootstrap.janet

 uninstall:
 	-rm '$(DESTDIR)$(BINDIR)/janet'
@@ -341,7 +345,7 @@ format:

 grammar: build/janet.tmLanguage
 build/janet.tmLanguage: tools/tm_lang_gen.janet $(JANET_TARGET)
-	$(JANET_TARGET) $< > $@
+	$(RUN) $(JANET_TARGET) $< > $@

 compile-commands:
 	# Requires pip install copmiledb
--- a/README.md
+++ b/README.md
@@ -7,14 +7,14 @@
 <img src="https://raw.githubusercontent.com/janet-lang/janet/master/assets/janet-w200.png" alt="Janet logo" width=200 align="left">

 **Janet** is a functional and imperative programming language and bytecode interpreter. It is a
-lisp-like language, but lists are replaced
+Lisp-like language, but lists are replaced
 by other data structures (arrays, tables (hash table), struct (immutable hash table), tuples).
 The language also supports bridging to native code written in C, meta-programming with macros, and bytecode assembly.

 There is a REPL for trying out the language, as well as the ability
 to run script files. This client program is separate from the core runtime, so
 Janet can be embedded in other programs. Try Janet in your browser at
-[https://janet-lang.org](https://janet-lang.org).
+<https://janet-lang.org>.

 If you'd like to financially support the ongoing development of Janet, consider
 [sponsoring its primary author](https://github.com/sponsors/bakpakin) through GitHub.
@@ -41,8 +41,8 @@ Lua, but smaller than GNU Guile or Python.
 * Macros
 * Multithreading
 * Per-thread event loop for efficient evented IO
-* Byte code interpreter with an assembly interface, as well as bytecode verification
-* Tail call Optimization
+* Bytecode interpreter with an assembly interface, as well as bytecode verification
+* Tail-call optimization
 * Direct interop with C via abstract types and C functions
 * Dynamically load C libraries
 * Functional and imperative standard library
@@ -57,7 +57,7 @@ Lua, but smaller than GNU Guile or Python.
 ## Documentation

 * For a quick tutorial, see [the introduction](https://janet-lang.org/docs/index.html) for more details.
-* For the full API for all functions in the core library, see [the core API doc](https://janet-lang.org/api/index.html)
+* For the full API for all functions in the core library, see [the core API doc](https://janet-lang.org/api/index.html).

 Documentation is also available locally in the REPL.
 Use the `(doc symbol-name)` macro to get API
@@ -65,7 +65,7 @@ documentation for symbols in the core library. For example,
 ```
 (doc apply)
 ```
-Shows documentation for the `apply` function.
+shows documentation for the `apply` function.

 To get a list of all bindings in the default
 environment, use the `(all-bindings)` function. You
@@ -84,7 +84,7 @@ the SourceHut mirror is actively maintained.

 The Makefile is non-portable and requires GNU-flavored make.

-```
+```sh
 cd somewhere/my/projects/janet
 make
 make test
@@ -100,7 +100,7 @@ Find out more about the available make targets by running `make help`.
 32-bit Haiku build instructions are the same as the UNIX-like build instructions,
 but you need to specify an alternative compiler, such as `gcc-x86`.

-```
+```sh
 cd somewhere/my/projects/janet
 make CC=gcc-x86
 make test
@@ -112,10 +112,9 @@ make install-jpm-git
 ### FreeBSD

 FreeBSD build instructions are the same as the UNIX-like build instructions,
-but you need `gmake` to compile. Alternatively, install directly from
-packages, using `pkg install lang/janet`.
+but you need `gmake` to compile. Alternatively, install the package directly with `pkg install lang/janet`.

-```
+```sh
 cd somewhere/my/projects/janet
 gmake
 gmake test
@@ -127,19 +126,19 @@ gmake install-jpm-git
 ### NetBSD

 NetBSD build instructions are the same as the FreeBSD build instructions.
-Alternatively, install directly from packages, using `pkgin install janet`.
+Alternatively, install the package directly with `pkgin install janet`.

 ### Windows

-1. Install [Visual Studio](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=Community&rel=15#) or [Visual Studio Build Tools](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools&rel=15#)
-2. Run a Visual Studio Command Prompt (cl.exe and link.exe need to be on the PATH) and cd to the directory with janet.
-3. Run `build_win` to compile janet.
+1. Install [Visual Studio](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=Community&rel=15#) or [Visual Studio Build Tools](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools&rel=15#).
+2. Run a Visual Studio Command Prompt (`cl.exe` and `link.exe` need to be on your PATH) and `cd` to the directory with Janet.
+3. Run `build_win` to compile Janet.
 4. Run `build_win test` to make sure everything is working.

 To build an `.msi` installer executable, in addition to the above steps, you will have to:

-5. Install, or otherwise add to your PATH the [WiX 3.11 Toolset](https://github.com/wixtoolset/wix3/releases)
-6. run `build_win dist`
+5. Install, or otherwise add to your PATH the [WiX 3.11 Toolset](https://github.com/wixtoolset/wix3/releases).
+6. Run `build_win dist`.

 Now you should have an `.msi`. You can run `build_win install` to install the `.msi`, or execute the file itself.

@@ -175,9 +174,9 @@ ninja -C build install

 Janet can be hacked on with pretty much any environment you like, but for IDE
 lovers, [Gnome Builder](https://wiki.gnome.org/Apps/Builder) is probably the
-best option, as it has excellent meson integration. It also offers code completion
+best option, as it has excellent Meson integration. It also offers code completion
 for Janet's C API right out of the box, which is very useful for exploring. VSCode, Vim,
-Emacs, and Atom will have syntax packages for the Janet language, though.
+Emacs, and Atom each have syntax packages for the Janet language, though.

 ## Installation

@@ -186,8 +185,8 @@ to try out the language, you don't need to install anything. You can also move t

 ## Usage

-A REPL is launched when the binary is invoked with no arguments. Pass the -h flag
-to display the usage information. Individual scripts can be run with `./janet myscript.janet`
+A REPL is launched when the binary is invoked with no arguments. Pass the `-h` flag
+to display the usage information. Individual scripts can be run with `./janet myscript.janet`.

 If you are looking to explore, you can print a list of all available macros, functions, and constants
 by entering the command `(all-bindings)` into the REPL.
@@ -202,20 +201,26 @@ Hello, World!
 nil
 janet:3:> (os/exit)
 $ janet -h
-usage: build/janet [options] script args...
+usage: janet [options] script args...
 Options are:
  -h : Show this help
  -v : Print the version string
  -s : Use raw stdin instead of getline like functionality
  -e code : Execute a string of janet
+  -E code arguments... : Evaluate an expression as a short-fn with arguments
+  -d : Set the debug flag in the REPL
  -r : Enter the REPL after running all scripts
+  -R : Disables loading profile.janet when JANET_PROFILE is present
  -p : Keep on executing if there is a top-level error (persistent)
-  -q : Hide prompt, logo, and REPL output (quiet)
+  -q : Hide logo (quiet)
  -k : Compile scripts but do not execute (flycheck)
  -m syspath : Set system path for loading global modules
  -c source output : Compile janet source code into an image
+  -i : Load the script argument as an image file instead of source code
  -n : Disable ANSI color output in the REPL
-  -l path : Execute code in a file before running the main script
+  -l lib : Use a module before processing more arguments
+  -w level : Set the lint warning level - default is "normal"
+  -x level : Set the lint error level - default is "none"
  -- : Stop handling options
 ```

@@ -226,8 +231,8 @@ If installed, you can also run `man janet` to get usage information.
 Janet can be embedded in a host program very easily. The normal build
 will create a file `build/janet.c`, which is a single C file
 that contains all the source to Janet. This file, along with
-`src/include/janet.h` and `src/conf/janetconf.h` can be dragged into any C
-project and compiled into the project. Janet should be compiled with `-std=c99`
+`src/include/janet.h` and `src/conf/janetconf.h`, can be dragged into any C
+project and compiled into it. Janet should be compiled with `-std=c99`
 on most compilers, and will need to be linked to the math library, `-lm`, and
 the dynamic linker, `-ldl`, if one wants to be able to load dynamic modules. If
 there is no need for dynamic modules, add the define
@@ -237,24 +242,24 @@ See the [Embedding Section](https://janet-lang.org/capi/embedding.html) on the w

 ## Examples

-See the examples directory for some example janet code.
+See the examples directory for some example Janet code.

 ## Discussion

-Feel free to ask questions and join the discussion on the [Janet Gitter Channel](https://gitter.im/janet-language/community).
-Gitter provides Matrix and irc bridges as well.
+Feel free to ask questions and join the discussion on the [Janet Gitter channel](https://gitter.im/janet-language/community).
+Gitter provides Matrix and IRC bridges as well.

 ## FAQ

 ### Where is (favorite feature from other language)?

-It may exist, it may not. If you want to propose major language features, go ahead and open an issue, but
-they will likely by closed as "will not implement". Often, such features make one usecase simpler at the expense
+It may exist, it may not. If you want to propose a major language feature, go ahead and open an issue, but
+it will likely be closed as "will not implement". Often, such features make one usecase simpler at the expense
 of 5 others by making the language more complicated.

 ### Is there a language spec?

-There is not currently a spec besides the documentation at https://janet-lang.org.
+There is not currently a spec besides the documentation at <https://janet-lang.org>.

 ### Is this Scheme/Common Lisp? Where are the cons cells?

@@ -270,13 +275,13 @@ Internally, Janet is not at all like Clojure.
 No. They are immutable arrays and hash tables. Don't try and use them like Clojure's vectors
 and maps, instead they work well as table keys or other identifiers.

-### Can I do Object Oriented programming with Janet?
+### Can I do object-oriented programming with Janet?

 To some extent, yes. However, it is not the recommended method of abstraction, and performance may suffer.
 That said, tables can be used to make mutable objects with inheritance and polymorphism, where object
-methods are implemeted with keywords.
+methods are implemented with keywords.

-```
+```clj
 (def Car @{:honk (fn [self msg] (print "car " self " goes " msg)) })
 (def my-car (table/setproto @{} Car))
 (:honk my-car "Beep!")
@@ -287,9 +292,9 @@ methods are implemeted with keywords.
 Usually, one of a few reasons:
 - Often, it already exists in a different form and the Clojure port would be redundant.
 - Clojure programs often generate a lot of garbage and rely on the JVM to clean it up.
-  Janet does not run on the JVM, and has a more primitive garbage collector.
- We want to keep the Janet core small. With Lisps, usually a feature can be added as a library
-  without feeling "bolted on", especially when compared to ALGOL like languages. Adding features
+  Janet does not run on the JVM and has a more primitive garbage collector.
+- We want to keep the Janet core small. With Lisps, a feature can usually be added as a library
+  without feeling "bolted on", especially when compared to ALGOL-like languages. Adding features
  to the core also makes it a bit more difficult to keep Janet maximally portable.

 ### Why is my terminal spitting out junk when I run the REPL?
@@ -297,7 +302,7 @@ Usually, one of a few reasons:
 Make sure your terminal supports ANSI escape codes. Most modern terminals will
 support these, but some older terminals, Windows consoles, or embedded terminals
 will not. If your terminal does not support ANSI escape codes, run the REPL with
-the `-n` flag, which disables color output. You can also try the `-s` if further issues
+the `-n` flag, which disables color output. You can also try the `-s` flag if further issues
 ensue.

 ## Why is it called "Janet"?
--- a/janet.1
+++ b/janet.1
@@ -183,6 +183,10 @@ default repl.
 .BR \-n
 Disable ANSI colors in the repl. Has no effect if no repl is run.

+.TP
+.BR \-N
+Enable ANSI colors in the repl. Has no effect if no repl is run.
+
 .TP
 .BR \-r
 Open a REPL (Read Eval Print Loop) after executing all sources. By default, if Janet is called with no
@@ -268,5 +272,11 @@ This variable does nothing in the default configuration of Janet, as PRF is disa
 cannot be defined for this variable to have an effect.
 .RE

+.B NO_COLOR
+.RS
+Turn off color by default in the repl and in the error handler of scripts. This can be changed at runtime
+via dynamic bindings *err-color* and *pretty-format*, or via the command line parameters -n and -N.
+.RE
+
 .SH AUTHOR
 Written by Calvin Rose <calsrose@gmail.com>
--- a/meson.build
+++ b/meson.build
@@ -20,7 +20,7 @@

 project('janet', 'c',
  default_options : ['c_std=c99', 'build.c_std=c99', 'b_lundef=false', 'default_library=both'],
-  version : '1.26.1')
+  version : '1.28.0')

 # Global settings
 janet_path = join_paths(get_option('prefix'), get_option('libdir'), 'janet')
--- a/src/boot/boot.janet
+++ b/src/boot/boot.janet
@@ -129,20 +129,18 @@
 # For macros, we define an imcomplete odd? function that will be overriden.
 (defn odd? [x] (= 1 (mod x 2)))

-(def idempotent?
-  ```
-  (idempotent? x)
+(def- non-atomic-types
+  {:array true
+   :tuple true
+   :table true
+   :buffer true
+   :symbol true
+   :struct true})

-  Check if x is a value that evaluates to itself when compiled.
-  ```
-  (do
-    (def non-atomic-types
-      {:array true
-       :tuple true
-       :table true
-       :buffer true
-       :struct true})
-    (fn idempotent? [x] (not (in non-atomic-types (type x))))))
+(defn idempotent?
+  "Check if x is a value that evaluates to itself when compiled."
+  [x]
+  (not (in non-atomic-types (type x))))

 # C style macros and functions for imperative sugar. No bitwise though.
 (defn inc "Returns x + 1." [x] (+ x 1))
@@ -282,7 +280,7 @@
  (while (> i 0)
    (-- i)
    (def v (in forms i))
-    (set ret (if (= ret true)
+    (set ret (if (= i (- len 1))
               v
               (if (idempotent? v)
                 ['if v ret v]
@@ -613,6 +611,13 @@
  (def $accum (gensym))
  ~(do (def ,$accum @[]) (loop ,head (,array/push ,$accum (do ,;body))) ,$accum))

+(defmacro catseq
+  ``Similar to `loop`, but concatenates each element from the loop body into an array and returns that.
+  See `loop` for details.``
+  [head & body]
+  (def $accum (gensym))
+  ~(do (def ,$accum @[]) (loop ,head (,array/concat ,$accum (do ,;body))) ,$accum))
+
 (defmacro tabseq
  ``Similar to `loop`, but accumulates key value pairs into a table.
  See `loop` for details.``
@@ -1135,16 +1140,16 @@
  (take-until (complement pred) ind))

 (defn drop
-  ``Drop the first n elements in an indexed or bytes type. Returns a new tuple or string
-  instance, respectively.``
+  ``Drop the first `n elements in an indexed or bytes type. Returns a new tuple or string
+  instance, respectively. If `n` is negative, drops the last `n` elements instead.``
  [n ind]
  (def use-str (bytes? ind))
  (def f (if use-str string/slice tuple/slice))
  (def len (length ind))
-  # make sure start is in [0, len]
-  (def m (if (> n 0) n 0))
-  (def start (if (> m len) len m))
-  (f ind start -1))
+  (def negn (>= n 0))
+  (def start (if negn (min n len) 0))
+  (def end (if negn len (max 0 (+ len n))))
+  (f ind start end))

 (defn drop-until
  "Same as `(drop-while (complement pred) ind)`."
@@ -1234,6 +1239,29 @@
     (,eprintf (,dyn :pretty-format "%q") ,s)
     ,s))

+(defn keep-syntax
+  ``Creates a tuple with the tuple type and sourcemap of `before` but the
+  elements of `after`. If either one of its argements is not a tuple, returns
+  `after` unmodified. Useful to preserve syntactic information when transforming
+  an ast in macros.``
+  [before after]
+  (if (and (= :tuple (type before))
+           (= :tuple (type after)))
+    (do
+      (def res (if (= :parens (tuple/type before))
+                 (tuple/slice after)
+                 (tuple/brackets ;after)))
+      (tuple/setmap res ;(tuple/sourcemap before)))
+    after))
+
+(defn keep-syntax!
+  ``Like `keep-syntax`, but if `after` is an array, it is coerced into a tuple.
+  Useful to preserve syntactic information when transforming an ast in macros.``
+  [before after]
+  (keep-syntax before (if (= :array (type after))
+                        (tuple/slice after)
+                        after)))
+
 (defmacro ->
  ``Threading macro. Inserts x as the second value in the first form
  in `forms`, and inserts the modified first form into the second form
@@ -1244,7 +1272,7 @@
                 (tuple (in n 0) (array/slice n 1))
                 (tuple n @[])))
    (def parts (array/concat @[h last] t))
-    (tuple/slice parts 0))
+    (keep-syntax! n parts))
  (reduce fop x forms))

 (defmacro ->>
@@ -1257,7 +1285,7 @@
                 (tuple (in n 0) (array/slice n 1))
                 (tuple n @[])))
    (def parts (array/concat @[h] t @[last]))
-    (tuple/slice parts 0))
+    (keep-syntax! n parts))
  (reduce fop x forms))

 (defmacro -?>
@@ -1273,7 +1301,7 @@
                 (tuple n @[])))
    (def sym (gensym))
    (def parts (array/concat @[h sym] t))
-    ~(let [,sym ,last] (if ,sym ,(tuple/slice parts 0))))
+    ~(let [,sym ,last] (if ,sym ,(keep-syntax! n parts))))
  (reduce fop x forms))

 (defmacro -?>>
@@ -1289,7 +1317,7 @@
                 (tuple n @[])))
    (def sym (gensym))
    (def parts (array/concat @[h] t @[sym]))
-    ~(let [,sym ,last] (if ,sym ,(tuple/slice parts 0))))
+    ~(let [,sym ,last] (if ,sym ,(keep-syntax! n parts))))
  (reduce fop x forms))

 (defn- walk-ind [f form]
@@ -1313,10 +1341,7 @@
    :table (walk-dict f form)
    :struct (table/to-struct (walk-dict f form))
    :array (walk-ind f form)
-    :tuple (let [x (walk-ind f form)]
-             (if (= :parens (tuple/type form))
-               (tuple/slice x)
-               (tuple/brackets ;x)))
+    :tuple (keep-syntax! form (walk-ind f form))
    form))

 (defn postwalk
@@ -2184,6 +2209,7 @@
  (defn saw-special-arg
    [num]
    (set max-param-seen (max max-param-seen num)))
+  (def prefix (gensym))
  (defn on-binding
    [x]
    (if (string/has-prefix? '$ x)
@@ -2191,22 +2217,24 @@
        (= '$ x)
        (do
          (saw-special-arg 0)
-          '$0)
+          (symbol prefix '$0))
        (= '$& x)
        (do
          (set vararg true)
-          x)
+          (symbol prefix x))
        :else
        (do
          (def num (scan-number (string/slice x 1)))
          (if (nat? num)
-            (saw-special-arg num))
-          x))
+            (do
+              (saw-special-arg num)
+              (symbol prefix x))
+            x)))
      x))
  (def expanded (macex arg on-binding))
  (def name-splice (if name [name] []))
-  (def fn-args (seq [i :range [0 (+ 1 max-param-seen)]] (symbol '$ i)))
-  ~(fn ,;name-splice [,;fn-args ,;(if vararg ['& '$&] [])] ,expanded))
+  (def fn-args (seq [i :range [0 (+ 1 max-param-seen)]] (symbol prefix '$ i)))
+  ~(fn ,;name-splice [,;fn-args ,;(if vararg ['& (symbol prefix '$&)] [])] ,expanded))

 ###
 ###
@@ -3830,6 +3858,7 @@

  (if-let [jp (getenv-alias "JANET_PATH")] (setdyn *syspath* jp))
  (if-let [jprofile (getenv-alias "JANET_PROFILE")] (setdyn *profilepath* jprofile))
+  (set colorize (not (getenv-alias "NO_COLOR")))

  (defn- get-lint-level
    [i]
@@ -3847,7 +3876,7 @@
               -v : Print the version string
               -s : Use raw stdin instead of getline like functionality
               -e code : Execute a string of janet
-               -E code arguments... : Evaluate  an expression as a short-fn with arguments
+               -E code arguments... : Evaluate an expression as a short-fn with arguments
               -d : Set the debug flag in the REPL
               -r : Enter the REPL after running all scripts
               -R : Disables loading profile.janet when JANET_PROFILE is present
@@ -3858,6 +3887,7 @@
               -c source output : Compile janet source code into an image
               -i : Load the script argument as an image file instead of source code
               -n : Disable ANSI color output in the REPL
+               -N : Enable ANSI color output in the REPL
               -l lib : Use a module before processing more arguments
               -w level : Set the lint warning level - default is "normal"
               -x level : Set the lint error level - default is "none"
@@ -3873,6 +3903,7 @@
     "i" (fn [&] (set expect-image true) 1)
     "k" (fn [&] (set compile-only true) (set exit-on-error false) 1)
     "n" (fn [&] (set colorize false) 1)
+     "N" (fn [&] (set colorize true) 1)
     "m" (fn [i &] (setdyn *syspath* (in args (+ i 1))) 2)
     "c" (fn c-switch [i &]
           (def path (in args (+ i 1)))
--- a/src/conf/janetconf.h
+++ b/src/conf/janetconf.h
@@ -4,10 +4,10 @@
 #define JANETCONF_H

 #define JANET_VERSION_MAJOR 1
-#define JANET_VERSION_MINOR 26
-#define JANET_VERSION_PATCH 1
-#define JANET_VERSION_EXTRA "-dev"
-#define JANET_VERSION "1.26.1-dev"
+#define JANET_VERSION_MINOR 28
+#define JANET_VERSION_PATCH 0
+#define JANET_VERSION_EXTRA ""
+#define JANET_VERSION "1.28.0"

 /* #define JANET_BUILD "local" */

--- a/src/core/buffer.c
+++ b/src/core/buffer.c
@@ -28,6 +28,13 @@
 #include "state.h"
 #endif

+/* Allow for managed buffers that cannot realloc/free their backing memory */
+static void janet_buffer_can_realloc(JanetBuffer *buffer) {
+    if (buffer->gc.flags & JANET_BUFFER_FLAG_NO_REALLOC) {
+        janet_panic("buffer cannot reallocate foreign memory");
+    }
+}
+
 /* Initialize a buffer */
 static JanetBuffer *janet_buffer_init_impl(JanetBuffer *buffer, int32_t capacity) {
    uint8_t *data = NULL;
@@ -51,9 +58,23 @@ JanetBuffer *janet_buffer_init(JanetBuffer *buffer, int32_t capacity) {
    return buffer;
 }

+/* Initialize an unmanaged buffer */
+JanetBuffer *janet_pointer_buffer_unsafe(void *memory, int32_t capacity, int32_t count) {
+    if (count < 0) janet_panic("count < 0");
+    if (capacity < count) janet_panic("capacity < count");
+    JanetBuffer *buffer = janet_gcalloc(JANET_MEMORY_BUFFER, sizeof(JanetBuffer));
+    buffer->gc.flags |= JANET_BUFFER_FLAG_NO_REALLOC;
+    buffer->capacity = capacity;
+    buffer->count = count;
+    buffer->data = (uint8_t *) memory;
+    return buffer;
+}
+
 /* Deinitialize a buffer (free data memory) */
 void janet_buffer_deinit(JanetBuffer *buffer) {
-    janet_free(buffer->data);
+    if (!(buffer->gc.flags & JANET_BUFFER_FLAG_NO_REALLOC)) {
+        janet_free(buffer->data);
+    }
 }

 /* Initialize a buffer */
@@ -67,6 +88,7 @@ void janet_buffer_ensure(JanetBuffer *buffer, int32_t capacity, int32_t growth)
    uint8_t *new_data;
    uint8_t *old = buffer->data;
    if (capacity <= buffer->capacity) return;
+    janet_buffer_can_realloc(buffer);
    int64_t big_capacity = ((int64_t) capacity) * growth;
    capacity = big_capacity > INT32_MAX ? INT32_MAX : (int32_t) big_capacity;
    janet_gcpressure(capacity - buffer->capacity);
@@ -99,6 +121,7 @@ void janet_buffer_extra(JanetBuffer *buffer, int32_t n) {
    }
    int32_t new_size = buffer->count + n;
    if (new_size > buffer->capacity) {
+        janet_buffer_can_realloc(buffer);
        int32_t new_capacity = (new_size > (INT32_MAX / 2)) ? INT32_MAX : (new_size * 2);
        uint8_t *new_data = janet_realloc(buffer->data, new_capacity * sizeof(uint8_t));
        janet_gcpressure(new_capacity - buffer->capacity);
@@ -220,6 +243,7 @@ JANET_CORE_FN(cfun_buffer_trim,
              "modified buffer.") {
    janet_fixarity(argc, 1);
    JanetBuffer *buffer = janet_getbuffer(argv, 0);
+    janet_buffer_can_realloc(buffer);
    if (buffer->count < buffer->capacity) {
        int32_t newcap = buffer->count > 4 ? buffer->count : 4;
        uint8_t *newData = janet_realloc(buffer->data, newcap);
@@ -283,17 +307,8 @@ JANET_CORE_FN(cfun_buffer_chars,
    return argv[0];
 }

-JANET_CORE_FN(cfun_buffer_push,
-              "(buffer/push buffer & xs)",
-              "Push both individual bytes and byte sequences to a buffer. For each x in xs, "
-              "push the byte if x is an integer, otherwise push the bytesequence to the buffer. "
-              "Thus, this function behaves like both `buffer/push-string` and `buffer/push-byte`. "
-              "Returns the modified buffer. "
-              "Will throw an error if the buffer overflows.") {
-    int32_t i;
-    janet_arity(argc, 1, -1);
-    JanetBuffer *buffer = janet_getbuffer(argv, 0);
-    for (i = 1; i < argc; i++) {
+static void buffer_push_impl(JanetBuffer *buffer, Janet *argv, int32_t argc_offset, int32_t argc) {
+    for (int32_t i = argc_offset; i < argc; i++) {
        if (janet_checktype(argv[i], JANET_NUMBER)) {
            janet_buffer_push_u8(buffer, (uint8_t)(janet_getinteger(argv, i) & 0xFF));
        } else {
@@ -305,6 +320,36 @@ JANET_CORE_FN(cfun_buffer_push,
            janet_buffer_push_bytes(buffer, view.bytes, view.len);
        }
    }
+}
+
+JANET_CORE_FN(cfun_buffer_push_at,
+              "(buffer/push-at buffer index & xs)",
+              "Same as buffer/push, but inserts new data at index `index`.") {
+    janet_arity(argc, 2, -1);
+    JanetBuffer *buffer = janet_getbuffer(argv, 0);
+    int32_t index = janet_getinteger(argv, 1);
+    int32_t old_count = buffer->count;
+    if (index < 0 || index > old_count) {
+        janet_panicf("index out of range [0, %d)", old_count);
+    }
+    buffer->count = index;
+    buffer_push_impl(buffer, argv, 2, argc);
+    if (buffer->count < old_count) {
+        buffer->count = old_count;
+    }
+    return argv[0];
+}
+
+JANET_CORE_FN(cfun_buffer_push,
+              "(buffer/push buffer & xs)",
+              "Push both individual bytes and byte sequences to a buffer. For each x in xs, "
+              "push the byte if x is an integer, otherwise push the bytesequence to the buffer. "
+              "Thus, this function behaves like both `buffer/push-string` and `buffer/push-byte`. "
+              "Returns the modified buffer. "
+              "Will throw an error if the buffer overflows.") {
+    janet_arity(argc, 1, -1);
+    JanetBuffer *buffer = janet_getbuffer(argv, 0);
+    buffer_push_impl(buffer, argv, 1, argc);
    return argv[0];
 }

@@ -468,6 +513,7 @@ void janet_lib_buffer(JanetTable *env) {
        JANET_CORE_REG("buffer/push-word", cfun_buffer_word),
        JANET_CORE_REG("buffer/push-string", cfun_buffer_chars),
        JANET_CORE_REG("buffer/push", cfun_buffer_push),
+        JANET_CORE_REG("buffer/push-at", cfun_buffer_push_at),
        JANET_CORE_REG("buffer/popn", cfun_buffer_popn),
        JANET_CORE_REG("buffer/clear", cfun_buffer_clear),
        JANET_CORE_REG("buffer/slice", cfun_buffer_slice),
--- a/src/core/capi.c
+++ b/src/core/capi.c
@@ -209,14 +209,28 @@ const char *janet_optcstring(const Janet *argv, int32_t argc, int32_t n, const c
 #undef DEFINE_OPTLEN

 const char *janet_getcstring(const Janet *argv, int32_t n) {
-    const uint8_t *jstr = janet_getstring(argv, n);
-    const char *cstr = (const char *)jstr;
-    if (strlen(cstr) != (size_t) janet_string_length(jstr)) {
-        janet_panic("string contains embedded 0s");
+    if (!janet_checktype(argv[n], JANET_STRING)) {
+        janet_panic_type(argv[n], n, JANET_TFLAG_STRING);
+    }
+    return janet_getcbytes(argv, n);
+}
+
+const char *janet_getcbytes(const Janet *argv, int32_t n) {
+    JanetByteView view = janet_getbytes(argv, n);
+    const char *cstr = (const char *)view.bytes;
+    if (strlen(cstr) != (size_t) view.len) {
+        janet_panic("bytes contain embedded 0s");
    }
    return cstr;
 }

+const char *janet_optcbytes(const Janet *argv, int32_t argc, int32_t n, const char *dflt) {
+    if (n >= argc || janet_checktype(argv[n], JANET_NIL)) {
+        return dflt;
+    }
+    return janet_getcbytes(argv, n);
+}
+
 int32_t janet_getnat(const Janet *argv, int32_t n) {
    Janet x = argv[n];
    if (!janet_checkint(x)) goto bad;
--- a/src/core/compile.c
+++ b/src/core/compile.c
@@ -422,6 +422,7 @@ JanetSlot *janetc_toslots(JanetCompiler *c, const Janet *vals, int32_t len) {
    int32_t i;
    JanetSlot *ret = NULL;
    JanetFopts subopts = janetc_fopts_default(c);
+    subopts.flags |= JANET_FOPTS_ACCEPT_SPLICE;
    for (i = 0; i < len; i++) {
        janet_v_push(ret, janetc_value(subopts, vals[i]));
    }
@@ -432,6 +433,7 @@ JanetSlot *janetc_toslots(JanetCompiler *c, const Janet *vals, int32_t len) {
 JanetSlot *janetc_toslotskv(JanetCompiler *c, Janet ds) {
    JanetSlot *ret = NULL;
    JanetFopts subopts = janetc_fopts_default(c);
+    subopts.flags |= JANET_FOPTS_ACCEPT_SPLICE;
    const JanetKV *kvs = NULL;
    int32_t cap = 0, len = 0;
    janet_dictionary_view(ds, &kvs, &len, &cap);
--- a/src/core/compile.h
+++ b/src/core/compile.h
@@ -187,6 +187,7 @@ struct JanetCompiler {
 #define JANET_FOPTS_TAIL 0x10000
 #define JANET_FOPTS_HINT 0x20000
 #define JANET_FOPTS_DROP 0x40000
+#define JANET_FOPTS_ACCEPT_SPLICE 0x80000

 /* Options for compiling a single form */
 struct JanetFopts {
--- a/src/core/corelib.c
+++ b/src/core/corelib.c
@@ -43,6 +43,7 @@ extern size_t janet_core_image_size;
 #endif

 JanetModule janet_native(const char *name, const uint8_t **error) {
+    janet_sandbox_assert(JANET_SANDBOX_DYNAMIC_MODULES);
    char *processed_name = get_processed_name(name);
    Clib lib = load_clib(processed_name);
    JanetModule init;
@@ -652,7 +653,7 @@ JANET_CORE_FN(janet_core_signal,

 JANET_CORE_FN(janet_core_memcmp,
              "(memcmp a b &opt len offset-a offset-b)",
-              "Compare memory. Takes to byte sequences `a` and `b`, and "
+              "Compare memory. Takes two byte sequences `a` and `b`, and "
              "return 0 if they have identical contents, a negative integer if a is less than b, "
              "and a positive integer if a is greater than b. Optionally take a length and offsets "
              "to compare slices of the bytes sequences.") {
@@ -667,6 +668,64 @@ JANET_CORE_FN(janet_core_memcmp,
    return janet_wrap_integer(memcmp(a.bytes + offset_a, b.bytes + offset_b, (size_t) len));
 }

+typedef struct SandboxOption {
+    const char *name;
+    uint32_t flag;
+} SandboxOption;
+
+static const SandboxOption sandbox_options[] = {
+    {"all", JANET_SANDBOX_ALL},
+    {"env", JANET_SANDBOX_ENV},
+    {"ffi", JANET_SANDBOX_FFI},
+    {"fs", JANET_SANDBOX_FS},
+    {"fs-read", JANET_SANDBOX_FS_READ},
+    {"fs-temp", JANET_SANDBOX_FS_TEMP},
+    {"fs-write", JANET_SANDBOX_FS_WRITE},
+    {"hrtime", JANET_SANDBOX_HRTIME},
+    {"modules", JANET_SANDBOX_DYNAMIC_MODULES},
+    {"net", JANET_SANDBOX_NET},
+    {"net-connect", JANET_SANDBOX_NET_CONNECT},
+    {"net-listen", JANET_SANDBOX_NET_LISTEN},
+    {"sandbox", JANET_SANDBOX_SANDBOX},
+    {"subprocess", JANET_SANDBOX_SUBPROCESS},
+    {NULL, 0}
+};
+
+JANET_CORE_FN(janet_core_sandbox,
+              "(sandbox & forbidden-capabilities)",
+              "Disable feature sets to prevent the interpreter from using certain system resources. "
+              "Once a feature is disabled, there is no way to re-enable it. Capabilities can be:\n\n"
+              "* :all - disallow all (except IO to stdout, stderr, and stdin)\n"
+              "* :env - disallow reading and write env variables\n"
+              "* :ffi - disallow FFI (recommended if disabling anything else)\n"
+              "* :fs - disallow access to the file system\n"
+              "* :fs-read - disallow read access to the file system\n"
+              "* :fs-temp - disallow creating temporary files\n"
+              "* :fs-write - disallow write access to the file system\n"
+              "* :hrtime - disallow high-resolution timers\n"
+              "* :modules - disallow load dynamic modules (natives)\n"
+              "* :net - disallow network access\n"
+              "* :net-connect - disallow making outbound network connections\n"
+              "* :net-listen - disallow accepting inbound network connections\n"
+              "* :sandbox - disallow calling this function\n"
+              "* :subprocess - disallow running subprocesses") {
+    uint32_t flags = 0;
+    for (int32_t i = 0; i < argc; i++) {
+        JanetKeyword kw = janet_getkeyword(argv, i);
+        const SandboxOption *opt = sandbox_options;
+        while (opt->name != NULL) {
+            if (janet_cstrcmp(kw, opt->name) == 0) {
+                flags |= opt->flag;
+                break;
+            }
+            opt++;
+        }
+        if (opt->name == NULL) janet_panicf("unknown capability %v", argv[i]);
+    }
+    janet_sandbox(flags);
+    return janet_wrap_nil();
+}
+
 #ifdef JANET_BOOTSTRAP

 /* Utility for inline assembly */
@@ -970,6 +1029,7 @@ static void janet_load_libs(JanetTable *env) {
        JANET_CORE_REG("signal", janet_core_signal),
        JANET_CORE_REG("memcmp", janet_core_memcmp),
        JANET_CORE_REG("getproto", janet_core_getproto),
+        JANET_CORE_REG("sandbox", janet_core_sandbox),
        JANET_REG_END
    };
    janet_core_cfuns_ext(env, NULL, corelib_cfuns);
--- a/src/core/ev.c
+++ b/src/core/ev.c
@@ -472,8 +472,12 @@ const JanetAbstractType janet_stream_type = {
 /* Register a fiber to resume with value */
 void janet_schedule_signal(JanetFiber *fiber, Janet value, JanetSignal sig) {
    if (fiber->gc.flags & JANET_FIBER_EV_FLAG_CANCELED) return;
-    fiber->gc.flags |= JANET_FIBER_FLAG_ROOT;
+    if (!(fiber->gc.flags & JANET_FIBER_FLAG_ROOT)) {
+        Janet task_element = janet_wrap_fiber(fiber);
+        janet_table_put(&janet_vm.active_tasks, task_element, janet_wrap_true());
+    }
    JanetTask t = { fiber, value, sig, ++fiber->sched_id };
+    fiber->gc.flags |= JANET_FIBER_FLAG_ROOT;
    if (sig == JANET_SIGNAL_ERROR) fiber->gc.flags |= JANET_FIBER_EV_FLAG_CANCELED;
    janet_q_push(&janet_vm.spawn, &t, sizeof(t));
 }
@@ -559,6 +563,7 @@ void janet_ev_init_common(void) {
    janet_vm.tq_count = 0;
    janet_vm.tq_capacity = 0;
    janet_table_init_raw(&janet_vm.threaded_abstracts, 0);
+    janet_table_init_raw(&janet_vm.active_tasks, 0);
    janet_rng_seed(&janet_vm.ev_rng, 0);
 #ifndef JANET_WINDOWS
    pthread_attr_init(&janet_vm.new_thread_attr);
@@ -573,13 +578,15 @@ void janet_ev_deinit_common(void) {
    janet_free(janet_vm.listeners);
    janet_vm.listeners = NULL;
    janet_table_deinit(&janet_vm.threaded_abstracts);
+    janet_table_deinit(&janet_vm.active_tasks);
 #ifndef JANET_WINDOWS
    pthread_attr_destroy(&janet_vm.new_thread_attr);
 #endif
 }

-/* Short hand to yield to event loop */
+/* Shorthand to yield to event loop */
 void janet_await(void) {
+    /* Store the fiber in a gobal table */
    janet_signalv(JANET_SIGNAL_EVENT, janet_wrap_nil());
 }

@@ -665,19 +672,6 @@ static void janet_chan_init(JanetChannel *chan, int32_t limit, int threaded) {
    janet_os_mutex_init((JanetOSMutex *) &chan->lock);
 }

-static void janet_chan_deinit(JanetChannel *chan) {
-    janet_q_deinit(&chan->read_pending);
-    janet_q_deinit(&chan->write_pending);
-    if (janet_chan_is_threaded(chan)) {
-        Janet item;
-        while (!janet_q_pop(&chan->items, &item, sizeof(item))) {
-            janet_chan_unpack(chan, &item, 1);
-        }
-    }
-    janet_q_deinit(&chan->items);
-    janet_os_mutex_deinit((JanetOSMutex *) &chan->lock);
-}
-
 static void janet_chan_lock(JanetChannel *chan) {
    if (!janet_chan_is_threaded(chan)) return;
    janet_os_mutex_lock((JanetOSMutex *) &chan->lock);
@@ -688,6 +682,25 @@ static void janet_chan_unlock(JanetChannel *chan) {
    janet_os_mutex_unlock((JanetOSMutex *) &chan->lock);
 }

+static void janet_chan_deinit(JanetChannel *chan) {
+    if (janet_chan_is_threaded(chan)) {
+        Janet item;
+        janet_chan_lock(chan);
+        janet_q_deinit(&chan->read_pending);
+        janet_q_deinit(&chan->write_pending);
+        while (!janet_q_pop(&chan->items, &item, sizeof(item))) {
+            janet_chan_unpack(chan, &item, 1);
+        }
+        janet_q_deinit(&chan->items);
+        janet_chan_unlock(chan);
+    } else {
+        janet_q_deinit(&chan->read_pending);
+        janet_q_deinit(&chan->write_pending);
+        janet_q_deinit(&chan->items);
+    }
+    janet_os_mutex_deinit((JanetOSMutex *) &chan->lock);
+}
+
 /*
 * Janet Channel abstract type
 */
@@ -764,6 +777,7 @@ static void janet_thread_chan_cb(JanetEVGenericMessage msg) {
    int mode = msg.tag;
    JanetChannel *channel = (JanetChannel *) msg.argp;
    Janet x = msg.argj;
+    janet_chan_lock(channel);
    if (fiber->sched_id == sched_id) {
        if (mode == JANET_CP_MODE_CHOICE_READ) {
            janet_assert(!janet_chan_unpack(channel, &x, 0), "packing error");
@@ -784,7 +798,6 @@ static void janet_thread_chan_cb(JanetEVGenericMessage msg) {
        int is_read = (mode == JANET_CP_MODE_CHOICE_READ) || (mode == JANET_CP_MODE_READ);
        if (is_read) {
            JanetChannelPending reader;
-            janet_chan_lock(channel);
            if (!janet_q_pop(&channel->read_pending, &reader, sizeof(reader))) {
                JanetVM *vm = reader.thread;
                JanetEVGenericMessage msg;
@@ -795,10 +808,8 @@ static void janet_thread_chan_cb(JanetEVGenericMessage msg) {
                msg.argj = x;
                janet_ev_post_event(vm, janet_thread_chan_cb, msg);
            }
-            janet_chan_unlock(channel);
        } else {
            JanetChannelPending writer;
-            janet_chan_lock(channel);
            if (!janet_q_pop(&channel->write_pending, &writer, sizeof(writer))) {
                JanetVM *vm = writer.thread;
                JanetEVGenericMessage msg;
@@ -809,21 +820,21 @@ static void janet_thread_chan_cb(JanetEVGenericMessage msg) {
                msg.argj = janet_wrap_nil();
                janet_ev_post_event(vm, janet_thread_chan_cb, msg);
            }
-            janet_chan_unlock(channel);
        }
    }
+    janet_chan_unlock(channel);
 }

 /* Push a value to a channel, and return 1 if channel should block, zero otherwise.
 * If the push would block, will add to the write_pending queue in the channel.
 * Handles both threaded and unthreaded channels. */
-static int janet_channel_push(JanetChannel *channel, Janet x, int mode) {
+static int janet_channel_push_with_lock(JanetChannel *channel, Janet x, int mode) {
    JanetChannelPending reader;
    int is_empty;
    if (janet_chan_pack(channel, &x)) {
+        janet_chan_unlock(channel);
        janet_panicf("failed to pack value for channel: %v", x);
    }
-    janet_chan_lock(channel);
    if (channel->closed) {
        janet_chan_unlock(channel);
        janet_panic("cannot write to closed channel");
@@ -884,12 +895,16 @@ static int janet_channel_push(JanetChannel *channel, Janet x, int mode) {
    return 0;
 }

+static int janet_channel_push(JanetChannel *channel, Janet x, int mode) {
+    janet_chan_lock(channel);
+    return janet_channel_push_with_lock(channel, x, mode);
+}
+
 /* Pop from a channel - returns 1 if item was obtained, 0 otherwise. The item
 * is returned by reference. If the pop would block, will add to the read_pending
 * queue in the channel. */
-static int janet_channel_pop(JanetChannel *channel, Janet *item, int is_choice) {
+static int janet_channel_pop_with_lock(JanetChannel *channel, Janet *item, int is_choice) {
    JanetChannelPending writer;
-    janet_chan_lock(channel);
    if (channel->closed) {
        janet_chan_unlock(channel);
        *item = janet_wrap_nil();
@@ -934,6 +949,11 @@ static int janet_channel_pop(JanetChannel *channel, Janet *item, int is_choice)
    return 1;
 }

+static int janet_channel_pop(JanetChannel *channel, Janet *item, int is_choice) {
+    janet_chan_lock(channel);
+    return janet_channel_pop_with_lock(channel, item, is_choice);
+}
+
 JanetChannel *janet_channel_unwrap(void *abstract) {
    return abstract;
 }
@@ -976,13 +996,32 @@ JANET_CORE_FN(cfun_channel_pop,
    janet_await();
 }

+static void chan_unlock_args(const Janet *argv, int32_t n) {
+    for (int32_t i = 0; i < n; i++) {
+        int32_t len;
+        const Janet *data;
+        JanetChannel *chan;
+        if (janet_indexed_view(argv[i], &data, &len) && len == 2) {
+            chan = janet_getchannel(data, 0);
+        } else {
+            chan = janet_getchannel(argv, i);
+        }
+        janet_chan_unlock(chan);
+    }
+}
+
 JANET_CORE_FN(cfun_channel_choice,
              "(ev/select & clauses)",
-              "Block until the first of several channel operations occur. Returns a tuple of the form [:give chan], [:take chan x], or [:close chan], where "
-              "a :give tuple is the result of a write and :take tuple is the result of a read. Each clause must be either a channel (for "
-              "a channel take operation) or a tuple [channel x] for a channel give operation. Operations are tried in order, such that the first "
-              "clauses will take precedence over later clauses. Both and give and take operations can return a [:close chan] tuple, which indicates that "
-              "the specified channel was closed while waiting, or that the channel was already closed.") {
+              "Block until the first of several channel operations occur. Returns a "
+              "tuple of the form [:give chan], [:take chan x], or [:close chan], "
+              "where a :give tuple is the result of a write and a :take tuple is the "
+              "result of a read. Each clause must be either a channel (for a channel "
+              "take operation) or a tuple [channel x] (for a channel give operation). "
+              "Operations are tried in order such that earlier clauses take "
+              "precedence over later clauses. Both give and take operations can "
+              "return a [:close chan] tuple, which indicates that the specified "
+              "channel was closed while waiting, or that the channel was already "
+              "closed.") {
    janet_arity(argc, 1, -1);
    int32_t len;
    const Janet *data;
@@ -995,29 +1034,29 @@ JANET_CORE_FN(cfun_channel_choice,
            janet_chan_lock(chan);
            if (chan->closed) {
                janet_chan_unlock(chan);
+                chan_unlock_args(argv, i);
                return make_close_result(chan);
            }
            if (janet_q_count(&chan->items) < chan->limit) {
-                janet_chan_unlock(chan);
-                janet_channel_push(chan, data[1], 1);
+                janet_channel_push_with_lock(chan, data[1], 1);
+                chan_unlock_args(argv, i);
                return make_write_result(chan);
            }
-            janet_chan_unlock(chan);
        } else {
            /* Read */
            JanetChannel *chan = janet_getchannel(argv, i);
            janet_chan_lock(chan);
            if (chan->closed) {
                janet_chan_unlock(chan);
+                chan_unlock_args(argv, i);
                return make_close_result(chan);
            }
            if (chan->items.head != chan->items.tail) {
                Janet item;
-                janet_chan_unlock(chan);
-                janet_channel_pop(chan, &item, 1);
+                janet_channel_pop_with_lock(chan, &item, 1);
+                chan_unlock_args(argv, i);
                return make_read_result(chan, item);
            }
-            janet_chan_unlock(chan);
        }
    }

@@ -1026,12 +1065,12 @@ JANET_CORE_FN(cfun_channel_choice,
        if (janet_indexed_view(argv[i], &data, &len) && len == 2) {
            /* Write */
            JanetChannel *chan = janet_getchannel(data, 0);
-            janet_channel_push(chan, data[1], 1);
+            janet_channel_push_with_lock(chan, data[1], 1);
        } else {
            /* Read */
            Janet item;
            JanetChannel *chan = janet_getchannel(argv, i);
-            janet_channel_pop(chan, &item, 1);
+            janet_channel_pop_with_lock(chan, &item, 1);
        }
    }

@@ -1252,16 +1291,7 @@ JanetFiber *janet_loop1(void) {
    while (peek_timeout(&to) && to.when <= now) {
        pop_timeout(0);
        if (to.curr_fiber != NULL) {
-            /* This is a deadline (for a fiber, not a function call) */
-            JanetFiberStatus s = janet_fiber_status(to.curr_fiber);
-            int isFinished = (s == JANET_STATUS_DEAD ||
-                              s == JANET_STATUS_ERROR ||
-                              s == JANET_STATUS_USER0 ||
-                              s == JANET_STATUS_USER1 ||
-                              s == JANET_STATUS_USER2 ||
-                              s == JANET_STATUS_USER3 ||
-                              s == JANET_STATUS_USER4);
-            if (!isFinished) {
+            if (janet_fiber_can_resume(to.curr_fiber)) {
                janet_cancel(to.fiber, janet_cstringv("deadline expired"));
            }
        } else {
@@ -1285,6 +1315,9 @@ JanetFiber *janet_loop1(void) {
        if (task.expected_sched_id != task.fiber->sched_id) continue;
        Janet res;
        JanetSignal sig = janet_continue_signal(task.fiber, task.value, &res, task.sig);
+        if (!janet_fiber_can_resume(task.fiber)) {
+            janet_table_remove(&janet_vm.active_tasks, janet_wrap_fiber(task.fiber));
+        }
        void *sv = task.fiber->supervisor_channel;
        int is_suspended = sig == JANET_SIGNAL_EVENT || sig == JANET_SIGNAL_YIELD || sig == JANET_SIGNAL_INTERRUPT;
        if (is_suspended) {
@@ -1316,15 +1349,8 @@ JanetFiber *janet_loop1(void) {
        /* Drop timeouts that are no longer needed */
        while ((has_timeout = peek_timeout(&to))) {
            if (to.curr_fiber != NULL) {
-                JanetFiberStatus s = janet_fiber_status(to.curr_fiber);
-                int is_finished = (s == JANET_STATUS_DEAD ||
-                                   s == JANET_STATUS_ERROR ||
-                                   s == JANET_STATUS_USER0 ||
-                                   s == JANET_STATUS_USER1 ||
-                                   s == JANET_STATUS_USER2 ||
-                                   s == JANET_STATUS_USER3 ||
-                                   s == JANET_STATUS_USER4);
-                if (is_finished) {
+                if (!janet_fiber_can_resume(to.curr_fiber)) {
+                    janet_table_remove(&janet_vm.active_tasks, janet_wrap_fiber(to.curr_fiber));
                    pop_timeout(0);
                    continue;
                }
@@ -2778,6 +2804,7 @@ static JanetEVGenericMessage janet_go_thread_subr(JanetEVGenericMessage args) {
    uint32_t flags = args.tag;
    args.tag = 0;
    janet_init();
+    janet_vm.sandbox_flags = (uint32_t) args.argi;
    JanetTryState tstate;
    JanetSignal signal = janet_try(&tstate);
    if (!signal) {
@@ -2930,13 +2957,13 @@ JANET_CORE_FN(cfun_ev_thread,
        JanetEVGenericMessage arguments;
        memset(&arguments, 0, sizeof(arguments));
        arguments.tag = (uint32_t) flags;
-        arguments.argi = argc;
+        arguments.argi = (uint32_t) janet_vm.sandbox_flags;
        arguments.argp = buffer;
        arguments.fiber = NULL;
        janet_ev_threaded_call(janet_go_thread_subr, arguments, janet_ev_default_threaded_callback);
        return janet_wrap_nil();
    } else {
-        janet_ev_threaded_await(janet_go_thread_subr, (uint32_t) flags, argc, buffer);
+        janet_ev_threaded_await(janet_go_thread_subr, (uint32_t) flags, (uint32_t) janet_vm.sandbox_flags, buffer);
    }
 }

@@ -3173,6 +3200,20 @@ JANET_CORE_FN(janet_cfun_rwlock_write_release,
    return argv[0];
 }

+JANET_CORE_FN(janet_cfun_ev_all_tasks,
+              "(ev/all-tasks)",
+              "Get an array of all active fibers that are being used by the scheduler.") {
+    janet_fixarity(argc, 0);
+    (void) argv;
+    JanetArray *array = janet_array(janet_vm.active_tasks.count);
+    for (int32_t i = 0; i < janet_vm.active_tasks.capacity; i++) {
+        if (!janet_checktype(janet_vm.active_tasks.data[i].key, JANET_NIL)) {
+            janet_array_push(array, janet_vm.active_tasks.data[i].key);
+        }
+    }
+    return janet_wrap_array(array);
+}
+
 void janet_lib_ev(JanetTable *env) {
    JanetRegExt ev_cfuns_ext[] = {
        JANET_CORE_REG("ev/give", cfun_channel_push),
@@ -3203,6 +3244,7 @@ void janet_lib_ev(JanetTable *env) {
        JANET_CORE_REG("ev/acquire-wlock", janet_cfun_rwlock_write_lock),
        JANET_CORE_REG("ev/release-rlock", janet_cfun_rwlock_read_release),
        JANET_CORE_REG("ev/release-wlock", janet_cfun_rwlock_write_release),
+        JANET_CORE_REG("ev/all-tasks", janet_cfun_ev_all_tasks),
        JANET_REG_END
    };

--- a/src/core/features.h
+++ b/src/core/features.h
@@ -61,4 +61,9 @@
 #define _NETBSD_SOURCE
 #endif

+/* Needed for several things when building with -std=c99. */
+#if !__BSD_VISIBLE && defined(__DragonFly__)
+#define __BSD_VISIBLE 1
+#endif
+
 #endif
--- a/src/core/ffi.c
+++ b/src/core/ffi.c
@@ -24,6 +24,7 @@
 #include "features.h"
 #include <janet.h>
 #include "util.h"
+#include "gc.h"
 #endif

 #ifdef JANET_FFI
@@ -309,6 +310,7 @@ static JanetFFIPrimType decode_ffi_prim(const uint8_t *name) {
    if (!janet_cstrcmp(name, "void")) return JANET_FFI_TYPE_VOID;
    if (!janet_cstrcmp(name, "bool")) return JANET_FFI_TYPE_BOOL;
    if (!janet_cstrcmp(name, "ptr")) return JANET_FFI_TYPE_PTR;
+    if (!janet_cstrcmp(name, "pointer")) return JANET_FFI_TYPE_PTR;
    if (!janet_cstrcmp(name, "string")) return JANET_FFI_TYPE_STRING;
    if (!janet_cstrcmp(name, "float")) return JANET_FFI_TYPE_FLOAT;
    if (!janet_cstrcmp(name, "double")) return JANET_FFI_TYPE_DOUBLE;
@@ -1301,6 +1303,7 @@ JANET_CORE_FN(cfun_ffi_jitfn,
              "(ffi/jitfn bytes)",
              "Create an abstract type that can be used as the pointer argument to `ffi/call`. The content "
              "of `bytes` is architecture specific machine code that will be copied into executable memory.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
    janet_fixarity(argc, 1);
    JanetByteView bytes = janet_getbytes(argv, 0);

@@ -1308,7 +1311,11 @@ JANET_CORE_FN(cfun_ffi_jitfn,
    size_t alloc_size = ((size_t) bytes.len + FFI_PAGE_MASK) & ~FFI_PAGE_MASK;

 #ifdef JANET_FFI_JIT
+#ifdef JANET_EV
    JanetFFIJittedFn *fn = janet_abstract_threaded(&janet_type_ffijit, sizeof(JanetFFIJittedFn));
+#else
+    JanetFFIJittedFn *fn = janet_abstract(&janet_type_ffijit, sizeof(JanetFFIJittedFn));
+#endif
    fn->function_pointer = NULL;
    fn->size = 0;
 #ifdef JANET_WINDOWS
@@ -1349,6 +1356,7 @@ JANET_CORE_FN(cfun_ffi_call,
              "(ffi/call pointer signature & args)",
              "Call a raw pointer as a function pointer. The function signature specifies "
              "how Janet values in `args` are converted to native machine types.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
    janet_arity(argc, 2, -1);
    void *function_pointer = janet_ffi_get_callable_pointer(argv, 0);
    JanetFFISignature *signature = janet_getabstract(argv, 1, &janet_signature_type);
@@ -1369,18 +1377,25 @@ JANET_CORE_FN(cfun_ffi_call,
 }

 JANET_CORE_FN(cfun_ffi_buffer_write,
-              "(ffi/write ffi-type data &opt buffer)",
-              "Append a native tyep to a buffer such as it would appear in memory. This can be used "
+              "(ffi/write ffi-type data &opt buffer index)",
+              "Append a native type to a buffer such as it would appear in memory. This can be used "
              "to pass pointers to structs in the ffi, or send C/C++/native structs over the network "
              "or to files. Returns a modifed buffer or a new buffer if one is not supplied.") {
-    janet_arity(argc, 2, 3);
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
+    janet_arity(argc, 2, 4);
    JanetFFIType type = decode_ffi_type(argv[0]);
    uint32_t el_size = (uint32_t) type_size(type);
    JanetBuffer *buffer = janet_optbuffer(argv, argc, 2, el_size);
+    int32_t index = janet_optnat(argv, argc, 3, 0);
+    int32_t old_count = buffer->count;
+    if (index > old_count) janet_panic("index out of bounds");
+    buffer->count = index;
    janet_buffer_extra(buffer, el_size);
-    memset(buffer->data, 0, el_size);
-    janet_ffi_write_one(buffer->data, argv, 1, type, JANET_FFI_MAX_RECUR);
-    buffer->count += el_size;
+    buffer->count = old_count;
+    memset(buffer->data + index, 0, el_size);
+    janet_ffi_write_one(buffer->data + index, argv, 1, type, JANET_FFI_MAX_RECUR);
+    index += el_size;
+    if (buffer->count < index) buffer->count = index;
    return janet_wrap_buffer(buffer);
 }

@@ -1389,6 +1404,7 @@ JANET_CORE_FN(cfun_ffi_buffer_read,
              "Parse a native struct out of a buffer and convert it to normal Janet data structures. "
              "This function is the inverse of `ffi/write`. `bytes` can also be a raw pointer, although "
              "this is unsafe.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
    janet_arity(argc, 2, 3);
    JanetFFIType type = decode_ffi_type(argv[0]);
    size_t offset = (size_t) janet_optnat(argv, argc, 2, 0);
@@ -1435,6 +1451,7 @@ JANET_CORE_FN(janet_core_raw_native,
              " or run any code from it. This is different than `native`, which will "
              "run initialization code to get a module table. If `path` is nil, opens the current running binary. "
              "Returns a `core/native`.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
    janet_arity(argc, 0, 1);
    const char *path = janet_optcstring(argv, argc, 0, NULL);
    Clib lib = load_clib(path);
@@ -1450,6 +1467,7 @@ JANET_CORE_FN(janet_core_native_lookup,
              "(ffi/lookup native symbol-name)",
              "Lookup a symbol from a native object. All symbol lookups will return a raw pointer "
              "if the symbol is found, else nil.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
    janet_fixarity(argc, 2);
    JanetAbstractNative *anative = janet_getabstract(argv, 0, &janet_native_type);
    const char *sym = janet_getcstring(argv, 1);
@@ -1463,6 +1481,7 @@ JANET_CORE_FN(janet_core_native_close,
              "(ffi/close native)",
              "Free a native object. Dereferencing pointers to symbols in the object will have undefined "
              "behavior after freeing.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
    janet_fixarity(argc, 1);
    JanetAbstractNative *anative = janet_getabstract(argv, 0, &janet_native_type);
    if (anative->closed) janet_panic("native object already closed");
@@ -1474,23 +1493,42 @@ JANET_CORE_FN(janet_core_native_close,

 JANET_CORE_FN(cfun_ffi_malloc,
              "(ffi/malloc size)",
-              "Allocates memory directly using the system memory allocator. Memory allocated in this way must be freed manually! Returns a raw pointer, or nil if size = 0.") {
+              "Allocates memory directly using the janet memory allocator. Memory allocated in this way must be freed manually! Returns a raw pointer, or nil if size = 0.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
    janet_fixarity(argc, 1);
    size_t size = janet_getsize(argv, 0);
    if (size == 0) return janet_wrap_nil();
-    return janet_wrap_pointer(malloc(size));
+    return janet_wrap_pointer(janet_malloc(size));
 }

 JANET_CORE_FN(cfun_ffi_free,
              "(ffi/free pointer)",
-              "Free memory allocated with `ffi/malloc`.") {
+              "Free memory allocated with `ffi/malloc`. Returns nil.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
    janet_fixarity(argc, 1);
    if (janet_checktype(argv[0], JANET_NIL)) return janet_wrap_nil();
    void *pointer = janet_getpointer(argv, 0);
-    free(pointer);
+    janet_free(pointer);
    return janet_wrap_nil();
 }

+JANET_CORE_FN(cfun_ffi_pointer_buffer,
+              "(ffi/pointer-buffer pointer capacity &opt count offset)",
+              "Create a buffer from a pointer. The underlying memory of the buffer will not be "
+              "reallocated or freed by the garbage collector, allowing unmanaged, mutable memory "
+              "to be manipulated with buffer functions. Attempts to resize or extend the buffer "
+              "beyond its initial capacity will raise an error. As with many FFI functions, this is memory "
+              "unsafe and can potentially allow out of bounds memory access. Returns a new buffer.") {
+    janet_sandbox_assert(JANET_SANDBOX_FFI);
+    janet_arity(argc, 2, 4);
+    void *pointer = janet_getpointer(argv, 0);
+    int32_t capacity = janet_getnat(argv, 1);
+    int32_t count = janet_optnat(argv, argc, 2, 0);
+    int64_t offset = janet_optinteger64(argv, argc, 3, 0);
+    uint8_t *offset_pointer = ((uint8_t *) pointer) + offset;
+    return janet_wrap_buffer(janet_pointer_buffer_unsafe(offset_pointer, capacity, count));
+}
+
 void janet_lib_ffi(JanetTable *env) {
    JanetRegExt ffi_cfuns[] = {
        JANET_CORE_REG("ffi/native", janet_core_raw_native),
@@ -1507,6 +1545,7 @@ void janet_lib_ffi(JanetTable *env) {
        JANET_CORE_REG("ffi/jitfn", cfun_ffi_jitfn),
        JANET_CORE_REG("ffi/malloc", cfun_ffi_malloc),
        JANET_CORE_REG("ffi/free", cfun_ffi_free),
+        JANET_CORE_REG("ffi/pointer-buffer", cfun_ffi_pointer_buffer),
        JANET_REG_END
    };
    janet_core_cfuns_ext(env, NULL, ffi_cfuns);
--- a/src/core/fiber.c
+++ b/src/core/fiber.c
@@ -495,6 +495,8 @@ JANET_CORE_FN(cfun_fiber_new,
              "* :t - block termination signals: error + user[0-4]\n"
              "* :u - block user signals\n"
              "* :y - block yield signals\n"
+              "* :w - block await signals (user9)\n"
+              "* :r - block interrupt signals (user8)\n"
              "* :0-9 - block a specific user signal\n\n"
              "The sigmask argument also can take environment flags. If any mutually "
              "exclusive flags are present, the last flag takes precedence.\n\n"
@@ -518,7 +520,7 @@ JANET_CORE_FN(cfun_fiber_new,
            } else {
                switch (view.bytes[i]) {
                    default:
-                        janet_panicf("invalid flag %c, expected a, t, d, e, u, y, i, or p", view.bytes[i]);
+                        janet_panicf("invalid flag %c, expected a, t, d, e, u, y, w, r, i, or p", view.bytes[i]);
                        break;
                    case 'a':
                        fiber->flags |=
@@ -548,6 +550,12 @@ JANET_CORE_FN(cfun_fiber_new,
                    case 'y':
                        fiber->flags |= JANET_FIBER_MASK_YIELD;
                        break;
+                    case 'w':
+                        fiber->flags |= JANET_FIBER_MASK_USER9;
+                        break;
+                    case 'r':
+                        fiber->flags |= JANET_FIBER_MASK_USER8;
+                        break;
                    case 'i':
                        if (!janet_vm.fiber->env) {
                            janet_vm.fiber->env = janet_table(0);
@@ -575,7 +583,9 @@ JANET_CORE_FN(cfun_fiber_status,
              "* :error - the fiber has errored out\n"
              "* :debug - the fiber is suspended in debug mode\n"
              "* :pending - the fiber has been yielded\n"
-              "* :user(0-9) - the fiber is suspended by a user signal\n"
+              "* :user(0-7) - the fiber is suspended by a user signal\n"
+              "* :interrupted - the fiber was interrupted\n"
+              "* :suspended - the fiber is waiting to be resumed by the scheduler\n"
              "* :alive - the fiber is currently running and cannot be resumed\n"
              "* :new - the fiber has just been created and not yet run") {
    janet_fixarity(argc, 1);
@@ -625,11 +635,7 @@ JANET_CORE_FN(cfun_fiber_setmaxstack,
    return argv[0];
 }

-JANET_CORE_FN(cfun_fiber_can_resume,
-              "(fiber/can-resume? fiber)",
-              "Check if a fiber is finished and cannot be resumed.") {
-    janet_fixarity(argc, 1);
-    JanetFiber *fiber = janet_getfiber(argv, 0);
+int janet_fiber_can_resume(JanetFiber *fiber) {
    JanetFiberStatus s = janet_fiber_status(fiber);
    int isFinished = s == JANET_STATUS_DEAD ||
                     s == JANET_STATUS_ERROR ||
@@ -638,7 +644,15 @@ JANET_CORE_FN(cfun_fiber_can_resume,
                     s == JANET_STATUS_USER2 ||
                     s == JANET_STATUS_USER3 ||
                     s == JANET_STATUS_USER4;
-    return janet_wrap_boolean(!isFinished);
+    return !isFinished;
+}
+
+JANET_CORE_FN(cfun_fiber_can_resume,
+              "(fiber/can-resume? fiber)",
+              "Check if a fiber is finished and cannot be resumed.") {
+    janet_fixarity(argc, 1);
+    JanetFiber *fiber = janet_getfiber(argv, 0);
+    return janet_wrap_boolean(janet_fiber_can_resume(fiber));
 }

 JANET_CORE_FN(cfun_fiber_last_value,
--- a/src/core/inttypes.c
+++ b/src/core/inttypes.c
@@ -502,6 +502,18 @@ static Janet cfun_it_s64_mod(int32_t argc, Janet *argv) {
    return janet_wrap_abstract(box);
 }

+static Janet cfun_it_s64_modi(int32_t argc, Janet *argv) {
+    janet_fixarity(argc, 2);
+    int64_t *box = janet_abstract(&janet_s64_type, sizeof(int64_t));
+    int64_t op2 = janet_unwrap_s64(argv[0]);
+    int64_t op1 = janet_unwrap_s64(argv[1]);
+    int64_t x = op1 % op2;
+    *box = (op1 > 0)
+           ? ((op2 > 0) ? x : (0 == x ? x : x + op2))
+           : ((op2 > 0) ? (0 == x ? x : x + op2) : x);
+    return janet_wrap_abstract(box);
+}
+
 OPMETHOD(int64_t, s64, add, +)
 OPMETHOD(int64_t, s64, sub, -)
 OPMETHODINVERT(int64_t, s64, subi, -)
@@ -509,6 +521,7 @@ OPMETHOD(int64_t, s64, mul, *)
 DIVMETHOD_SIGNED(int64_t, s64, div, /)
 DIVMETHOD_SIGNED(int64_t, s64, rem, %)
 DIVMETHODINVERT_SIGNED(int64_t, s64, divi, /)
+DIVMETHODINVERT_SIGNED(int64_t, s64, remi, %)
 OPMETHOD(int64_t, s64, and, &)
 OPMETHOD(int64_t, s64, or, |)
 OPMETHOD(int64_t, s64, xor, ^)
@@ -521,6 +534,7 @@ OPMETHOD(uint64_t, u64, mul, *)
 DIVMETHOD(uint64_t, u64, div, /)
 DIVMETHOD(uint64_t, u64, mod, %)
 DIVMETHODINVERT(uint64_t, u64, divi, /)
+DIVMETHODINVERT(uint64_t, u64, modi, %)
 OPMETHOD(uint64_t, u64, and, &)
 OPMETHOD(uint64_t, u64, or, |)
 OPMETHOD(uint64_t, u64, xor, ^)
@@ -542,9 +556,9 @@ static JanetMethod it_s64_methods[] = {
    {"/", cfun_it_s64_div},
    {"r/", cfun_it_s64_divi},
    {"mod", cfun_it_s64_mod},
-    {"rmod", cfun_it_s64_mod},
+    {"rmod", cfun_it_s64_modi},
    {"%", cfun_it_s64_rem},
-    {"r%", cfun_it_s64_rem},
+    {"r%", cfun_it_s64_remi},
    {"&", cfun_it_s64_and},
    {"r&", cfun_it_s64_and},
    {"|", cfun_it_s64_or},
@@ -567,9 +581,9 @@ static JanetMethod it_u64_methods[] = {
    {"/", cfun_it_u64_div},
    {"r/", cfun_it_u64_divi},
    {"mod", cfun_it_u64_mod},
-    {"rmod", cfun_it_u64_mod},
+    {"rmod", cfun_it_u64_modi},
    {"%", cfun_it_u64_mod},
-    {"r%", cfun_it_u64_mod},
+    {"r%", cfun_it_u64_modi},
    {"&", cfun_it_u64_and},
    {"r&", cfun_it_u64_and},
    {"|", cfun_it_u64_or},
--- a/src/core/io.c
+++ b/src/core/io.c
@@ -69,12 +69,15 @@ static int32_t checkflags(const uint8_t *str) {
            break;
        case 'w':
            flags |= JANET_FILE_WRITE;
+            janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
            break;
        case 'a':
            flags |= JANET_FILE_APPEND;
+            janet_sandbox_assert(JANET_SANDBOX_FS);
            break;
        case 'r':
            flags |= JANET_FILE_READ;
+            janet_sandbox_assert(JANET_SANDBOX_FS_READ);
            break;
    }
    for (i = 1; i < len; i++) {
@@ -84,6 +87,7 @@ static int32_t checkflags(const uint8_t *str) {
                break;
            case '+':
                if (flags & JANET_FILE_UPDATE) return -1;
+                janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
                flags |= JANET_FILE_UPDATE;
                break;
            case 'b':
@@ -116,6 +120,7 @@ JANET_CORE_FN(cfun_io_temp,
              "(file/temp)",
              "Open an anonymous temporary file that is removed on close. "
              "Raises an error on failure.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_TEMP);
    (void)argv;
    janet_fixarity(argc, 0);
    // XXX use mkostemp when we can to avoid CLOEXEC race.
@@ -148,6 +153,7 @@ JANET_CORE_FN(cfun_io_fopen,
        flags = checkflags(fmode);
    } else {
        fmode = (const uint8_t *)"r";
+        janet_sandbox_assert(JANET_SANDBOX_FS_READ);
        flags = JANET_FILE_READ;
    }
    FILE *f = fopen((const char *)fname, (const char *)fmode);
@@ -342,11 +348,24 @@ JANET_CORE_FN(cfun_io_fseek,
    return argv[0];
 }

+JANET_CORE_FN(cfun_io_ftell,
+              "(file/tell f)",
+              "Get the current value of the file position for file `f`.") {
+    janet_fixarity(argc, 1);
+    JanetFile *iof = janet_getabstract(argv, 0, &janet_file_type);
+    if (iof->flags & JANET_FILE_CLOSED)
+        janet_panic("file is closed");
+    long pos = ftell(iof->file);
+    if (pos == -1) janet_panic("error getting position in file");
+    return janet_wrap_number((double)pos);
+}
+
 static JanetMethod io_file_methods[] = {
    {"close", cfun_io_fclose},
    {"flush", cfun_io_fflush},
    {"read", cfun_io_fread},
    {"seek", cfun_io_fseek},
+    {"tell", cfun_io_ftell},
    {"write", cfun_io_fwrite},
    {NULL, NULL}
 };
@@ -777,6 +796,7 @@ void janet_lib_io(JanetTable *env) {
        JANET_CORE_REG("file/write", cfun_io_fwrite),
        JANET_CORE_REG("file/flush", cfun_io_fflush),
        JANET_CORE_REG("file/seek", cfun_io_fseek),
+        JANET_CORE_REG("file/tell", cfun_io_ftell),
        JANET_REG_END
    };
    janet_core_cfuns_ext(env, NULL, io_cfuns);
--- a/src/core/marsh.c
+++ b/src/core/marsh.c
@@ -67,7 +67,8 @@ enum {
    LB_UNSAFE_POINTER, /* 222 */
    LB_STRUCT_PROTO, /* 223 */
 #ifdef JANET_EV
-    LB_THREADED_ABSTRACT/* 224 */
+    LB_THREADED_ABSTRACT, /* 224 */
+    LB_POINTER_BUFFER, /* 224 */
 #endif
 } LeadBytes;

@@ -153,6 +154,10 @@ static void pushbytes(MarshalState *st, const uint8_t *bytes, int32_t len) {
    janet_buffer_push_bytes(st->buf, bytes, len);
 }

+static void pushpointer(MarshalState *st, void *ptr) {
+    janet_buffer_push_bytes(st->buf, (const uint8_t *) &ptr, sizeof(ptr));
+}
+
 /* Marshal a size_t onto the buffer */
 static void push64(MarshalState *st, uint64_t x) {
    if (x <= 0xF0) {
@@ -511,6 +516,16 @@ static void marshal_one(MarshalState *st, Janet x, int flags) {
            JanetBuffer *buffer = janet_unwrap_buffer(x);
            /* Record reference */
            MARK_SEEN();
+#ifdef JANET_EV
+            if ((flags & JANET_MARSHAL_UNSAFE) &&
+                    (buffer->gc.flags & JANET_BUFFER_FLAG_NO_REALLOC)) {
+                pushbyte(st, LB_POINTER_BUFFER);
+                pushint(st, buffer->count);
+                pushint(st, buffer->capacity);
+                pushpointer(st, buffer->data);
+                return;
+            }
+#endif
            pushbyte(st, LB_BUFFER);
            pushint(st, buffer->count);
            pushbytes(st, buffer->data, buffer->count);
@@ -606,8 +621,7 @@ static void marshal_one(MarshalState *st, Janet x, int flags) {
            if (!(flags & JANET_MARSHAL_UNSAFE)) goto no_registry;
            MARK_SEEN();
            pushbyte(st, LB_UNSAFE_POINTER);
-            void *ptr = janet_unwrap_pointer(x);
-            pushbytes(st, (uint8_t *) &ptr, sizeof(void *));
+            pushpointer(st, janet_unwrap_pointer(x));
            return;
        }
    no_registry:
@@ -1415,6 +1429,29 @@ static const uint8_t *unmarshal_one(
            janet_v_push(st->lookup, *out);
            return data;
        }
+#ifdef JANET_EV
+        case LB_POINTER_BUFFER: {
+            data++;
+            int32_t count = readnat(st, &data);
+            int32_t capacity = readnat(st, &data);
+            MARSH_EOS(st, data + sizeof(void *));
+            union {
+                void *ptr;
+                uint8_t bytes[sizeof(void *)];
+            } u;
+            if (!(flags & JANET_MARSHAL_UNSAFE)) {
+                janet_panicf("unsafe flag not given, "
+                             "will not unmarshal raw pointer at index %d",
+                             (int)(data - st->start));
+            }
+            memcpy(u.bytes, data, sizeof(void *));
+            data += sizeof(void *);
+            JanetBuffer *buffer = janet_pointer_buffer_unsafe(u.ptr, capacity, count);
+            *out = janet_wrap_buffer(buffer);
+            janet_v_push(st->lookup, *out);
+            return data;
+        }
+#endif
        case LB_UNSAFE_CFUNCTION: {
            MARSH_EOS(st, data + sizeof(JanetCFunction));
            data++;
--- a/src/core/math.c
+++ b/src/core/math.c
@@ -150,8 +150,8 @@ JANET_CORE_FN(cfun_rng_uniform,

 JANET_CORE_FN(cfun_rng_int,
              "(math/rng-int rng &opt max)",
-              "Extract a random random integer in the range [0, max] from the RNG. If "
-              "no max is given, the default is 2^31 - 1."
+              "Extract a random integer in the range [0, max) for max > 0 from the RNG.  "
+              "If max is 0, return 0.  If no max is given, the default is 2^31 - 1."
             ) {
    janet_arity(argc, 1, 2);
    JanetRNG *rng = janet_getabstract(argv, 0, &janet_rng_type);
@@ -254,45 +254,45 @@ JANET_CORE_FN(janet_srand,
    return janet_wrap_nil();
 }

-#define JANET_DEFINE_NAMED_MATHOP(c_name, janet_name, fop, doc)\
-JANET_CORE_FN(janet_##c_name, "(math/" #janet_name " x)", doc) {\
+#define JANET_DEFINE_NAMED_MATHOP(janet_name, fop, doc)\
+JANET_CORE_FN(janet_##fop, "(math/" janet_name " x)", doc) {\
    janet_fixarity(argc, 1); \
    double x = janet_getnumber(argv, 0); \
    return janet_wrap_number(fop(x)); \
 }

-#define JANET_DEFINE_MATHOP(name, fop, doc) JANET_DEFINE_NAMED_MATHOP(name, name, fop, doc)
+#define JANET_DEFINE_MATHOP(fop, doc) JANET_DEFINE_NAMED_MATHOP(#fop, fop, doc)

-JANET_DEFINE_MATHOP(acos, acos, "Returns the arccosine of x.")
-JANET_DEFINE_MATHOP(asin, asin, "Returns the arcsin of x.")
-JANET_DEFINE_MATHOP(atan, atan, "Returns the arctangent of x.")
-JANET_DEFINE_MATHOP(cos, cos, "Returns the cosine of x.")
-JANET_DEFINE_MATHOP(cosh, cosh, "Returns the hyperbolic cosine of x.")
-JANET_DEFINE_MATHOP(acosh, acosh, "Returns the hyperbolic arccosine of x.")
-JANET_DEFINE_MATHOP(sin, sin, "Returns the sine of x.")
-JANET_DEFINE_MATHOP(sinh, sinh, "Returns the hyperbolic sine of x.")
-JANET_DEFINE_MATHOP(asinh, asinh, "Returns the hyperbolic arcsine of x.")
-JANET_DEFINE_MATHOP(tan, tan, "Returns the tangent of x.")
-JANET_DEFINE_MATHOP(tanh, tanh, "Returns the hyperbolic tangent of x.")
-JANET_DEFINE_MATHOP(atanh, atanh, "Returns the hyperbolic arctangent of x.")
-JANET_DEFINE_MATHOP(exp, exp, "Returns e to the power of x.")
-JANET_DEFINE_MATHOP(exp2, exp2, "Returns 2 to the power of x.")
-JANET_DEFINE_MATHOP(expm1, expm1, "Returns e to the power of x minus 1.")
-JANET_DEFINE_MATHOP(log, log, "Returns the natural logarithm of x.")
-JANET_DEFINE_MATHOP(log10, log10, "Returns the log base 10 of x.")
-JANET_DEFINE_MATHOP(log2, log2, "Returns the log base 2 of x.")
-JANET_DEFINE_MATHOP(sqrt, sqrt, "Returns the square root of x.")
-JANET_DEFINE_MATHOP(cbrt, cbrt, "Returns the cube root of x.")
-JANET_DEFINE_MATHOP(ceil, ceil, "Returns the smallest integer value number that is not less than x.")
-JANET_DEFINE_MATHOP(abs, fabs, "Return the absolute value of x.")
-JANET_DEFINE_MATHOP(floor, floor, "Returns the largest integer value number that is not greater than x.")
-JANET_DEFINE_MATHOP(trunc, trunc, "Returns the integer between x and 0 nearest to x.")
-JANET_DEFINE_MATHOP(round, round, "Returns the integer nearest to x.")
-JANET_DEFINE_MATHOP(gamma, tgamma, "Returns gamma(x).")
-JANET_DEFINE_NAMED_MATHOP(lgamma, "log-gamma", lgamma, "Returns log-gamma(x).")
-JANET_DEFINE_MATHOP(log1p, log1p, "Returns (log base e of x) + 1 more accurately than (+ (math/log x) 1)")
-JANET_DEFINE_MATHOP(erf, erf, "Returns the error function of x.")
-JANET_DEFINE_MATHOP(erfc, erfc, "Returns the complementary error function of x.")
+JANET_DEFINE_MATHOP(acos, "Returns the arccosine of x.")
+JANET_DEFINE_MATHOP(asin, "Returns the arcsin of x.")
+JANET_DEFINE_MATHOP(atan, "Returns the arctangent of x.")
+JANET_DEFINE_MATHOP(cos, "Returns the cosine of x.")
+JANET_DEFINE_MATHOP(cosh, "Returns the hyperbolic cosine of x.")
+JANET_DEFINE_MATHOP(acosh, "Returns the hyperbolic arccosine of x.")
+JANET_DEFINE_MATHOP(sin, "Returns the sine of x.")
+JANET_DEFINE_MATHOP(sinh, "Returns the hyperbolic sine of x.")
+JANET_DEFINE_MATHOP(asinh, "Returns the hyperbolic arcsine of x.")
+JANET_DEFINE_MATHOP(tan, "Returns the tangent of x.")
+JANET_DEFINE_MATHOP(tanh, "Returns the hyperbolic tangent of x.")
+JANET_DEFINE_MATHOP(atanh, "Returns the hyperbolic arctangent of x.")
+JANET_DEFINE_MATHOP(exp, "Returns e to the power of x.")
+JANET_DEFINE_MATHOP(exp2, "Returns 2 to the power of x.")
+JANET_DEFINE_MATHOP(expm1, "Returns e to the power of x minus 1.")
+JANET_DEFINE_MATHOP(log, "Returns the natural logarithm of x.")
+JANET_DEFINE_MATHOP(log10, "Returns the log base 10 of x.")
+JANET_DEFINE_MATHOP(log2, "Returns the log base 2 of x.")
+JANET_DEFINE_MATHOP(sqrt, "Returns the square root of x.")
+JANET_DEFINE_MATHOP(cbrt, "Returns the cube root of x.")
+JANET_DEFINE_MATHOP(ceil, "Returns the smallest integer value number that is not less than x.")
+JANET_DEFINE_MATHOP(floor, "Returns the largest integer value number that is not greater than x.")
+JANET_DEFINE_MATHOP(trunc, "Returns the integer between x and 0 nearest to x.")
+JANET_DEFINE_MATHOP(round, "Returns the integer nearest to x.")
+JANET_DEFINE_MATHOP(log1p, "Returns (log base e of x) + 1 more accurately than (+ (math/log x) 1)")
+JANET_DEFINE_MATHOP(erf, "Returns the error function of x.")
+JANET_DEFINE_MATHOP(erfc, "Returns the complementary error function of x.")
+JANET_DEFINE_NAMED_MATHOP("log-gamma", lgamma, "Returns log-gamma(x).")
+JANET_DEFINE_NAMED_MATHOP("abs", fabs, "Return the absolute value of x.")
+JANET_DEFINE_NAMED_MATHOP("gamma", tgamma, "Returns gamma(x).")

 #define JANET_DEFINE_MATH2OP(name, fop, signature, doc)\
 JANET_CORE_FN(janet_##name, signature, doc) {\
@@ -317,7 +317,7 @@ static double janet_gcd(double x, double y) {
 #ifdef NAN
        return NAN;
 #else
-        return 0.0 \ 0.0;
+        return 0.0 / 0.0;
 #endif
    }
    if (isinf(x) || isinf(y)) return INFINITY;
@@ -370,7 +370,7 @@ void janet_lib_math(JanetTable *env) {
        JANET_CORE_REG("math/floor", janet_floor),
        JANET_CORE_REG("math/ceil", janet_ceil),
        JANET_CORE_REG("math/pow", janet_pow),
-        JANET_CORE_REG("math/abs", janet_abs),
+        JANET_CORE_REG("math/abs", janet_fabs),
        JANET_CORE_REG("math/sinh", janet_sinh),
        JANET_CORE_REG("math/cosh", janet_cosh),
        JANET_CORE_REG("math/tanh", janet_tanh),
@@ -385,7 +385,7 @@ void janet_lib_math(JanetTable *env) {
        JANET_CORE_REG("math/hypot", janet_hypot),
        JANET_CORE_REG("math/exp2", janet_exp2),
        JANET_CORE_REG("math/log1p", janet_log1p),
-        JANET_CORE_REG("math/gamma", janet_gamma),
+        JANET_CORE_REG("math/gamma", janet_tgamma),
        JANET_CORE_REG("math/log-gamma", janet_lgamma),
        JANET_CORE_REG("math/erfc", janet_erfc),
        JANET_CORE_REG("math/erf", janet_erf),
--- a/src/core/net.c
+++ b/src/core/net.c
@@ -334,6 +334,7 @@ JANET_CORE_FN(cfun_net_sockaddr,
              "given in the port argument. On Linux, abstract "
              "unix domain sockets are specified with a leading '@' character in port. If `multi` is truthy, will "
              "return all address that match in an array instead of just the first.") {
+    janet_sandbox_assert(JANET_SANDBOX_NET_CONNECT); /* connect OR listen */
    janet_arity(argc, 2, 4);
    int socktype = janet_get_sockettype(argv, argc, 2);
    int is_unix = 0;
@@ -379,6 +380,7 @@ JANET_CORE_FN(cfun_net_connect,
              "to specify a connection type, either :stream or :datagram. The default is :stream. "
              "Bindhost is an optional string to select from what address to make the outgoing "
              "connection, with the default being the same as using the OS's preferred address. ") {
+    janet_sandbox_assert(JANET_SANDBOX_NET_CONNECT);
    janet_arity(argc, 2, 5);

    /* Check arguments */
@@ -573,6 +575,7 @@ JANET_CORE_FN(cfun_net_listen,
              "The type parameter specifies the type of network connection, either "
              "a :stream (usually tcp), or :datagram (usually udp). If not specified, the default is "
              ":stream. The host and port arguments are the same as in net/address.") {
+    janet_sandbox_assert(JANET_SANDBOX_NET_LISTEN);
    janet_arity(argc, 2, 3);

    /* Get host, port, and handler*/
--- a/src/core/os.c
+++ b/src/core/os.c
@@ -126,6 +126,8 @@ JANET_CORE_FN(os_which,
              "* :freebsd\n\n"
              "* :openbsd\n\n"
              "* :netbsd\n\n"
+              "* :dragonfly\n\n"
+              "* :bsd\n\n"
              "* :posix - A POSIX compatible system (default)\n\n"
              "May also return a custom keyword specified at build time.") {
    janet_fixarity(argc, 0);
@@ -150,6 +152,8 @@ JANET_CORE_FN(os_which,
    return janet_ckeywordv("netbsd");
 #elif defined(__OpenBSD__)
    return janet_ckeywordv("openbsd");
+#elif defined(__DragonFly__)
+    return janet_ckeywordv("dragonfly");
 #elif defined(JANET_BSD)
    return janet_ckeywordv("bsd");
 #else
@@ -878,6 +882,7 @@ static JanetFile *get_stdio_for_handle(JanetHandle handle, void *orig, int iswri
 #endif

 static Janet os_execute_impl(int32_t argc, Janet *argv, int is_spawn) {
+    janet_sandbox_assert(JANET_SANDBOX_SUBPROCESS);
    janet_arity(argc, 1, 3);

    /* Get flags */
@@ -1038,21 +1043,21 @@ static Janet os_execute_impl(int32_t argc, Janet *argv, int is_spawn) {
    if (pipe_in != JANET_HANDLE_NONE) {
        posix_spawn_file_actions_adddup2(&actions, pipe_in, 0);
        posix_spawn_file_actions_addclose(&actions, pipe_in);
-    } else if (new_in != JANET_HANDLE_NONE) {
+    } else if (new_in != JANET_HANDLE_NONE && new_in != 0) {
        posix_spawn_file_actions_adddup2(&actions, new_in, 0);
        posix_spawn_file_actions_addclose(&actions, new_in);
    }
    if (pipe_out != JANET_HANDLE_NONE) {
        posix_spawn_file_actions_adddup2(&actions, pipe_out, 1);
        posix_spawn_file_actions_addclose(&actions, pipe_out);
-    } else if (new_out != JANET_HANDLE_NONE) {
+    } else if (new_out != JANET_HANDLE_NONE && new_out != 1) {
        posix_spawn_file_actions_adddup2(&actions, new_out, 1);
        posix_spawn_file_actions_addclose(&actions, new_out);
    }
    if (pipe_err != JANET_HANDLE_NONE) {
        posix_spawn_file_actions_adddup2(&actions, pipe_err, 2);
        posix_spawn_file_actions_addclose(&actions, pipe_err);
-    } else if (new_err != JANET_HANDLE_NONE) {
+    } else if (new_err != JANET_HANDLE_NONE && new_err != 2) {
        posix_spawn_file_actions_adddup2(&actions, new_err, 2);
        posix_spawn_file_actions_addclose(&actions, new_err);
    }
@@ -1080,7 +1085,8 @@ static Janet os_execute_impl(int32_t argc, Janet *argv, int is_spawn) {

    os_execute_cleanup(envp, child_argv);
    if (status) {
-        janet_panicf("%p: %s", argv[0], strerror(errno));
+        /* correct for macos bug where errno is not set */
+        janet_panicf("%p: %s", argv[0], strerror(errno ? errno : ENOENT));
    }

 #endif
@@ -1171,6 +1177,7 @@ static JanetEVGenericMessage os_shell_subr(JanetEVGenericMessage args) {
 JANET_CORE_FN(os_shell,
              "(os/shell str)",
              "Pass a command string str directly to the system shell.") {
+    janet_sandbox_assert(JANET_SANDBOX_SUBPROCESS);
    janet_arity(argc, 0, 1);
    const char *cmd = argc
                      ? janet_getcstring(argv, 0)
@@ -1190,6 +1197,7 @@ JANET_CORE_FN(os_shell,
 JANET_CORE_FN(os_environ,
              "(os/environ)",
              "Get a copy of the OS environment table.") {
+    janet_sandbox_assert(JANET_SANDBOX_ENV);
    (void) argv;
    janet_fixarity(argc, 0);
    int32_t nenv = 0;
@@ -1221,6 +1229,7 @@ JANET_CORE_FN(os_environ,
 JANET_CORE_FN(os_getenv,
              "(os/getenv variable &opt dflt)",
              "Get the string value of an environment variable.") {
+    janet_sandbox_assert(JANET_SANDBOX_ENV);
    janet_arity(argc, 1, 2);
    const char *cstr = janet_getcstring(argv, 0);
    const char *res = getenv(cstr);
@@ -1244,6 +1253,7 @@ JANET_CORE_FN(os_setenv,
 #define SETENV(K,V) setenv(K, V, 1)
 #define UNSETENV(K) unsetenv(K)
 #endif
+    janet_sandbox_assert(JANET_SANDBOX_ENV);
    janet_arity(argc, 1, 2);
    const char *ks = janet_getcstring(argv, 0);
    const char *vs = janet_optcstring(argv, argc, 1, NULL);
@@ -1271,6 +1281,7 @@ JANET_CORE_FN(os_clock,
              "(os/clock)",
              "Return the number of whole + fractional seconds since some fixed point in time. The clock "
              "is guaranteed to be non-decreasing in real time.") {
+    janet_sandbox_assert(JANET_SANDBOX_HRTIME);
    janet_fixarity(argc, 0);
    (void) argv;
    struct timespec tv;
@@ -1340,6 +1351,40 @@ JANET_CORE_FN(os_cryptorand,
    return janet_wrap_buffer(buffer);
 }

+/* Helper function to get given or current time as local or UTC struct tm.
+ * - arg n+0: optional time_t to be converted, uses current time if not given
+ * - arg n+1: optional truthy to indicate the convnersion uses local time */
+static struct tm *time_to_tm(const Janet *argv, int32_t argc, int32_t n, struct tm *t_infos) {
+    time_t t;
+    if (argc > n && !janet_checktype(argv[n], JANET_NIL)) {
+        int64_t integer = janet_getinteger64(argv, n);
+        t = (time_t) integer;
+    } else {
+        time(&t);
+    }
+    struct tm *t_info = NULL;
+    if (argc > n + 1 && janet_truthy(argv[n + 1])) {
+        /* local time */
+#ifdef JANET_WINDOWS
+        _tzset();
+        localtime_s(t_infos, &t);
+        t_info = t_infos;
+#else
+        tzset();
+        t_info = localtime_r(&t, t_infos);
+#endif
+    } else {
+        /* utc time */
+#ifdef JANET_WINDOWS
+        gmtime_s(t_infos, &t);
+        t_info = t_infos;
+#else
+        t_info = gmtime_r(&t, t_infos);
+#endif
+    }
+    return t_info;
+}
+
 JANET_CORE_FN(os_date,
              "(os/date &opt time local)",
              "Returns the given time as a date struct, or the current time if `time` is not given. "
@@ -1357,34 +1402,8 @@ JANET_CORE_FN(os_date,
              "* :dst - if Day Light Savings is in effect") {
    janet_arity(argc, 0, 2);
    (void) argv;
-    time_t t;
    struct tm t_infos;
-    struct tm *t_info = NULL;
-    if (argc && !janet_checktype(argv[0], JANET_NIL)) {
-        int64_t integer = janet_getinteger64(argv, 0);
-        t = (time_t) integer;
-    } else {
-        time(&t);
-    }
-    if (argc >= 2 && janet_truthy(argv[1])) {
-        /* local time */
-#ifdef JANET_WINDOWS
-        _tzset();
-        localtime_s(&t_infos, &t);
-        t_info = &t_infos;
-#else
-        tzset();
-        t_info = localtime_r(&t, &t_infos);
-#endif
-    } else {
-        /* utc time */
-#ifdef JANET_WINDOWS
-        gmtime_s(&t_infos, &t);
-        t_info = &t_infos;
-#else
-        t_info = gmtime_r(&t, &t_infos);
-#endif
-    }
+    struct tm *t_info = time_to_tm(argv, argc, 0, &t_infos);
    JanetKV *st = janet_struct_begin(9);
    janet_struct_put(st, janet_ckeywordv("seconds"), janet_wrap_number(t_info->tm_sec));
    janet_struct_put(st, janet_ckeywordv("minutes"), janet_wrap_number(t_info->tm_min));
@@ -1398,6 +1417,34 @@ JANET_CORE_FN(os_date,
    return janet_wrap_struct(janet_struct_end(st));
 }

+#define SIZETIMEFMT     250
+
+JANET_CORE_FN(os_strftime,
+              "(os/strftime fmt &opt time local)",
+              "Format the given time as a string, or the current time if `time` is not given. "
+              "The time is formatted according to the same rules as the ISO C89 function strftime(). "
+              "The time is formatted in UTC unless `local` is truthy, in which case the date is formatted for "
+              "the local timezone.") {
+    janet_arity(argc, 1, 3);
+    const char *fmt = janet_getcstring(argv, 0);
+    /* ANSI X3.159-1989, section 4.12.3.5 "The strftime function" */
+    static const char *valid = "aAbBcdHIjmMpSUwWxXyYZ%";
+    const char *p = fmt;
+    while (*p) {
+        if (*p++ == '%') {
+            if (!strchr(valid, *p)) {
+                janet_panicf("invalid conversion specifier '%%%c'", *p);
+            }
+            p++;
+        }
+    }
+    struct tm t_infos;
+    struct tm *t_info = time_to_tm(argv, argc, 1, &t_infos);
+    char buf[SIZETIMEFMT];
+    (void)strftime(buf, SIZETIMEFMT, fmt, t_info);
+    return janet_cstringv(buf);
+}
+
 static int entry_getdst(Janet env_entry) {
    Janet v;
    if (janet_checktype(env_entry, JANET_TABLE)) {
@@ -1512,6 +1559,7 @@ JANET_CORE_FN(os_link,
              "Iff symlink is truthy, creates a symlink. "
              "Iff symlink is falsey or not provided, "
              "creates a hard link. Does not work on Windows.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
    janet_arity(argc, 2, 3);
 #ifdef JANET_WINDOWS
    (void) argc;
@@ -1530,6 +1578,7 @@ JANET_CORE_FN(os_link,
 JANET_CORE_FN(os_symlink,
              "(os/symlink oldpath newpath)",
              "Create a symlink from oldpath to newpath, returning nil. Same as `(os/link oldpath newpath true)`.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
    janet_fixarity(argc, 2);
 #ifdef JANET_WINDOWS
    (void) argc;
@@ -1552,6 +1601,7 @@ JANET_CORE_FN(os_mkdir,
              "Create a new directory. The path will be relative to the current directory if relative, otherwise "
              "it will be an absolute path. Returns true if the directory was created, false if the directory already exists, and "
              "errors otherwise.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
    janet_fixarity(argc, 1);
    const char *path = janet_getcstring(argv, 0);
 #ifdef JANET_WINDOWS
@@ -1567,6 +1617,7 @@ JANET_CORE_FN(os_mkdir,
 JANET_CORE_FN(os_rmdir,
              "(os/rmdir path)",
              "Delete a directory. The directory must be empty to succeed.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
    janet_fixarity(argc, 1);
    const char *path = janet_getcstring(argv, 0);
 #ifdef JANET_WINDOWS
@@ -1581,6 +1632,7 @@ JANET_CORE_FN(os_rmdir,
 JANET_CORE_FN(os_cd,
              "(os/cd path)",
              "Change current directory to path. Returns nil on success, errors on failure.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_READ);
    janet_fixarity(argc, 1);
    const char *path = janet_getcstring(argv, 0);
 #ifdef JANET_WINDOWS
@@ -1596,6 +1648,7 @@ JANET_CORE_FN(os_touch,
              "(os/touch path &opt actime modtime)",
              "Update the access time and modification times for a file. By default, sets "
              "times to the current time.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
    janet_arity(argc, 1, 3);
    const char *path = janet_getcstring(argv, 0);
    struct utimbuf timebuf, *bufp;
@@ -1845,6 +1898,7 @@ static const struct OsStatGetter os_stat_getters[] = {
 };

 static Janet os_stat_or_lstat(int do_lstat, int32_t argc, Janet *argv) {
+    janet_sandbox_assert(JANET_SANDBOX_FS_READ);
    janet_arity(argc, 1, 2);
    const char *path = janet_getcstring(argv, 0);
    JanetTable *tab = NULL;
@@ -1926,6 +1980,7 @@ JANET_CORE_FN(os_chmod,
              "`os/perm-string`, or an integer as returned by `os/perm-int`. "
              "When `mode` is an integer, it is interpreted as a Unix permission value, best specified in octal, like "
              "8r666 or 8r400. Windows will not differentiate between user, group, and other permissions, and thus will combine all of these permissions. Returns nil.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
    janet_fixarity(argc, 2);
    const char *path = janet_getcstring(argv, 0);
 #ifdef JANET_WINDOWS
@@ -1941,6 +1996,7 @@ JANET_CORE_FN(os_chmod,
 JANET_CORE_FN(os_umask,
              "(os/umask mask)",
              "Set a new umask, returns the old umask.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
    janet_fixarity(argc, 1);
    int mask = (int) os_getmode(argv, 0);
 #ifdef JANET_WINDOWS
@@ -1956,6 +2012,7 @@ JANET_CORE_FN(os_dir,
              "(os/dir dir &opt array)",
              "Iterate over files and subdirectories in a directory. Returns an array of paths parts, "
              "with only the file name or directory name and no prefix.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_READ);
    janet_arity(argc, 1, 2);
    const char *dir = janet_getcstring(argv, 0);
    JanetArray *paths = (argc == 2) ? janet_getarray(argv, 1) : janet_array(0);
@@ -1993,6 +2050,7 @@ JANET_CORE_FN(os_dir,
 JANET_CORE_FN(os_rename,
              "(os/rename oldname newname)",
              "Rename a file on disk to a new path. Returns nil.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
    janet_fixarity(argc, 2);
    const char *src = janet_getcstring(argv, 0);
    const char *dest = janet_getcstring(argv, 1);
@@ -2007,6 +2065,7 @@ JANET_CORE_FN(os_realpath,
              "(os/realpath path)",
              "Get the absolute path for a given path, following ../, ./, and symlinks. "
              "Returns an absolute path as a string.") {
+    janet_sandbox_assert(JANET_SANDBOX_FS_READ);
    janet_fixarity(argc, 1);
    const char *src = janet_getcstring(argv, 0);
 #ifdef JANET_NO_REALPATH
@@ -2101,19 +2160,23 @@ JANET_CORE_FN(os_open,
            case 'r':
                desiredAccess |= GENERIC_READ;
                stream_flags |= JANET_STREAM_READABLE;
+                janet_sandbox_assert(JANET_SANDBOX_FS_READ);
                break;
            case 'w':
                desiredAccess |= GENERIC_WRITE;
                stream_flags |= JANET_STREAM_WRITABLE;
+                janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
                break;
            case 'c':
                creatUnix |= OCREAT;
+                janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
                break;
            case 'e':
                creatUnix |= OEXCL;
                break;
            case 't':
                creatUnix |= OTRUNC;
+                janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
                break;
            /* Windows only flags */
            case 'D':
@@ -2183,19 +2246,23 @@ JANET_CORE_FN(os_open,
            case 'r':
                read_flag = 1;
                stream_flags |= JANET_STREAM_READABLE;
+                janet_sandbox_assert(JANET_SANDBOX_FS_READ);
                break;
            case 'w':
                write_flag = 1;
                stream_flags |= JANET_STREAM_WRITABLE;
+                janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
                break;
            case 'c':
                open_flags |= O_CREAT;
+                janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
                break;
            case 'e':
                open_flags |= O_EXCL;
                break;
            case 't':
                open_flags |= O_TRUNC;
+                janet_sandbox_assert(JANET_SANDBOX_FS_WRITE);
                break;
            /* posix only */
            case 'x':
@@ -2270,48 +2337,66 @@ void janet_lib_os(JanetTable *env) {
        JANET_CORE_REG("os/arch", os_arch),
        JANET_CORE_REG("os/compiler", os_compiler),
 #ifndef JANET_REDUCED_OS
+
+        /* misc (un-sandboxed) */
+        JANET_CORE_REG("os/cpu-count", os_cpu_count),
+        JANET_CORE_REG("os/cwd", os_cwd),
+        JANET_CORE_REG("os/cryptorand", os_cryptorand),
+        JANET_CORE_REG("os/perm-string", os_permission_string),
+        JANET_CORE_REG("os/perm-int", os_permission_int),
+        JANET_CORE_REG("os/mktime", os_mktime),
+        JANET_CORE_REG("os/time", os_time), /* not high resolution */
+        JANET_CORE_REG("os/date", os_date), /* not high resolution */
+        JANET_CORE_REG("os/strftime", os_strftime),
+        JANET_CORE_REG("os/sleep", os_sleep),
+
+        /* env functions */
        JANET_CORE_REG("os/environ", os_environ),
        JANET_CORE_REG("os/getenv", os_getenv),
+        JANET_CORE_REG("os/setenv", os_setenv),
+
+        /* fs read */
        JANET_CORE_REG("os/dir", os_dir),
        JANET_CORE_REG("os/stat", os_stat),
        JANET_CORE_REG("os/lstat", os_lstat),
        JANET_CORE_REG("os/chmod", os_chmod),
        JANET_CORE_REG("os/touch", os_touch),
+        JANET_CORE_REG("os/realpath", os_realpath),
        JANET_CORE_REG("os/cd", os_cd),
-        JANET_CORE_REG("os/cpu-count", os_cpu_count),
 #ifndef JANET_NO_UMASK
        JANET_CORE_REG("os/umask", os_umask),
 #endif
+#ifndef JANET_NO_SYMLINKS
+        JANET_CORE_REG("os/readlink", os_readlink),
+#endif
+
+        /* fs write */
        JANET_CORE_REG("os/mkdir", os_mkdir),
        JANET_CORE_REG("os/rmdir", os_rmdir),
        JANET_CORE_REG("os/rm", os_remove),
        JANET_CORE_REG("os/link", os_link),
+        JANET_CORE_REG("os/rename", os_rename),
 #ifndef JANET_NO_SYMLINKS
        JANET_CORE_REG("os/symlink", os_symlink),
-        JANET_CORE_REG("os/readlink", os_readlink),
 #endif
+
+        /* processes */
 #ifndef JANET_NO_PROCESSES
        JANET_CORE_REG("os/execute", os_execute),
        JANET_CORE_REG("os/spawn", os_spawn),
        JANET_CORE_REG("os/shell", os_shell),
+        /* no need to sandbox process management if you can't create processes
+         * (allows for limited functionality if use exposes C-functions to create specific processes) */
        JANET_CORE_REG("os/proc-wait", os_proc_wait),
        JANET_CORE_REG("os/proc-kill", os_proc_kill),
        JANET_CORE_REG("os/proc-close", os_proc_close),
 #endif
-        JANET_CORE_REG("os/setenv", os_setenv),
-        JANET_CORE_REG("os/time", os_time),
-        JANET_CORE_REG("os/mktime", os_mktime),
+
+        /* high resolution timers */
        JANET_CORE_REG("os/clock", os_clock),
-        JANET_CORE_REG("os/sleep", os_sleep),
-        JANET_CORE_REG("os/cwd", os_cwd),
-        JANET_CORE_REG("os/cryptorand", os_cryptorand),
-        JANET_CORE_REG("os/date", os_date),
-        JANET_CORE_REG("os/rename", os_rename),
-        JANET_CORE_REG("os/realpath", os_realpath),
-        JANET_CORE_REG("os/perm-string", os_permission_string),
-        JANET_CORE_REG("os/perm-int", os_permission_int),
+
 #ifdef JANET_EV
-        JANET_CORE_REG("os/open", os_open),
+        JANET_CORE_REG("os/open", os_open), /* fs read and write */
        JANET_CORE_REG("os/pipe", os_pipe),
 #endif
 #endif
--- a/src/core/parse.c
+++ b/src/core/parse.c
@@ -1194,7 +1194,8 @@ static Janet parser_state_delimiters(const JanetParser *_p) {
            }
        }
    }
-    str = janet_string(p->buf + oldcount, (int32_t)(p->bufcount - oldcount));
+    /* avoid ptr arithmetic on NULL */
+    str = janet_string(oldcount ? p->buf + oldcount : p->buf, (int32_t)(p->bufcount - oldcount));
    p->bufcount = oldcount;
    return janet_wrap_string(str);
 }
@@ -1205,10 +1206,11 @@ static Janet parser_state_frames(const JanetParser *p) {
    states->count = count;
    uint8_t *buf = p->buf;
    /* Iterate arg stack backwards */
-    Janet *args = p->args + p->argcount;
+    Janet *args = p->argcount ? p->args + p->argcount : p->args; /* avoid ptr arithmetic on NULL */
    for (int32_t i = count - 1; i >= 0; --i) {
        JanetParseState *s = p->states + i;
-        if (s->flags & PFLAG_CONTAINER) {
+        /* avoid ptr arithmetic on args if NULL */
+        if ((s->flags & PFLAG_CONTAINER) && s->argn) {
            args -= s->argn;
        }
        states->data[i] = janet_wrap_parse_state(s, args, buf, (uint32_t) p->bufcount);
--- a/src/core/peg.c
+++ b/src/core/peg.c
@@ -1034,7 +1034,7 @@ static void spec_capture_number(Builder *b, int32_t argc, const Janet *argv) {
    emit_3(r, RULE_CAPTURE_NUM, rule, base, tag);
    return;
 error:
-    peg_panicf(b, "expected integer between 2 and 36, got %v", argv[2]);
+    peg_panicf(b, "expected integer between 2 and 36, got %v", argv[1]);
 }

 static void spec_reference(Builder *b, int32_t argc, const Janet *argv) {
@@ -1637,7 +1637,7 @@ typedef struct {
    JanetPeg *peg;
    PegState s;
    JanetByteView bytes;
-    JanetByteView repl;
+    Janet subst;
    int32_t start;
 } PegCall;

@@ -1653,7 +1653,7 @@ static PegCall peg_cfun_init(int32_t argc, Janet *argv, int get_replace) {
        ret.peg = compile_peg(argv[0]);
    }
    if (get_replace) {
-        ret.repl = janet_getbytes(argv, 1);
+        ret.subst = argv[1];
        ret.bytes = janet_getbytes(argv, 2);
    } else {
        ret.bytes = janet_getbytes(argv, 1);
@@ -1738,7 +1738,8 @@ static Janet cfun_peg_replace_generic(int32_t argc, Janet *argv, int only_one) {
                trail = i;
            }
            int32_t nexti = (int32_t)(result - c.bytes.bytes);
-            janet_buffer_push_bytes(ret, c.repl.bytes, c.repl.len);
+            JanetByteView subst = janet_text_substitution(&c.subst, c.bytes.bytes + i, nexti - i, c.s.captures);
+            janet_buffer_push_bytes(ret, subst.bytes, subst.len);
            trail = nexti;
            if (nexti == i) nexti++;
            i = nexti;
@@ -1754,14 +1755,20 @@ static Janet cfun_peg_replace_generic(int32_t argc, Janet *argv, int only_one) {
 }

 JANET_CORE_FN(cfun_peg_replace_all,
-              "(peg/replace-all peg repl text &opt start & args)",
-              "Replace all matches of peg in text with repl, returning a new buffer. The peg does not need to make captures to do replacement.") {
+              "(peg/replace-all peg subst text &opt start & args)",
+              "Replace all matches of `peg` in `text` with `subst`, returning a new buffer. "
+              "The peg does not need to make captures to do replacement. "
+              "If `subst` is a function, it will be called with the "
+              "matching text followed by any captures.") {
    return cfun_peg_replace_generic(argc, argv, 0);
 }

 JANET_CORE_FN(cfun_peg_replace,
              "(peg/replace peg repl text &opt start & args)",
-              "Replace first match of peg in text with repl, returning a new buffer. The peg does not need to make captures to do replacement. "
+              "Replace first match of `peg` in `text` with `subst`, returning a new buffer. "
+              "The peg does not need to make captures to do replacement. "
+              "If `subst` is a function, it will be called with the "
+              "matching text followed by any captures. "
              "If no matches are found, returns the input string in a new buffer.") {
    return cfun_peg_replace_generic(argc, argv, 1);
 }
--- a/src/core/pp.c
+++ b/src/core/pp.c
@@ -637,7 +637,7 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
                    }
                }

-                janet_sorted_keys(kvs, cap, S->keysort_buffer + ks_start);
+                janet_sorted_keys(kvs, cap, S->keysort_buffer == NULL ? NULL : S->keysort_buffer + ks_start);
                S->keysort_start += len;
                if (!(S->flags & JANET_PRETTY_NOTRUNC) && (len > JANET_PRETTY_DICT_LIMIT)) {
                    len = JANET_PRETTY_DICT_LIMIT;
@@ -809,7 +809,8 @@ static const char *scanformat(
    *(form++) = '%';
    const char *p2 = strfrmt;
    while (p2 <= p) {
-        if (strchr(FMT_REPLACE_INTTYPES, *p2) != NULL) {
+        char *loc = strchr(FMT_REPLACE_INTTYPES, *p2);
+        if (loc != NULL && *loc != '\0') {
            const char *mapping = get_fmt_mapping(*p2++);
            size_t len = strlen(mapping);
            strcpy(form, mapping);
--- a/src/core/specials.c
+++ b/src/core/specials.c
@@ -39,6 +39,10 @@ static JanetSlot janetc_quote(JanetFopts opts, int32_t argn, const Janet *argv)

 static JanetSlot janetc_splice(JanetFopts opts, int32_t argn, const Janet *argv) {
    JanetSlot ret;
+    if (!(opts.flags & JANET_FOPTS_ACCEPT_SPLICE)) {
+        janetc_cerror(opts.compiler, "splice can only be used in function parameters and data constructors, it has no effect here");
+        return janetc_cslot(janet_wrap_nil());
+    }
    if (argn != 1) {
        janetc_cerror(opts.compiler, "expected 1 argument to splice");
        return janetc_cslot(janet_wrap_nil());
@@ -75,7 +79,9 @@ static JanetSlot quasiquote(JanetFopts opts, Janet x, int depth, int level) {
                const uint8_t *head = janet_unwrap_symbol(tup[0]);
                if (!janet_cstrcmp(head, "unquote")) {
                    if (level == 0) {
-                        return janetc_value(janetc_fopts_default(opts.compiler), tup[1]);
+                        JanetFopts subopts = janetc_fopts_default(opts.compiler);
+                        subopts.flags |= JANET_FOPTS_ACCEPT_SPLICE;
+                        return janetc_value(subopts, tup[1]);
                    } else {
                        level--;
                    }
@@ -203,8 +209,9 @@ static int destructure(JanetCompiler *c,
                    janetc_emit(c, JOP_JUMP);
                    int32_t label_loop_exit = janet_v_count(c->buffer);

-                    c->buffer[label_loop_cond_jump] |= (label_loop_exit - label_loop_cond_jump) << 16;
-                    c->buffer[label_loop_loop] |= (label_loop_start - label_loop_loop) << 8;
+                    /* avoid shifting negative numbers */
+                    c->buffer[label_loop_cond_jump] |= (uint32_t)(label_loop_exit - label_loop_cond_jump) << 16;
+                    c->buffer[label_loop_loop] |= (uint32_t)(label_loop_start - label_loop_loop) << 8;

                    janetc_freeslot(c, argi);
                    janetc_freeslot(c, arg);
@@ -487,6 +494,7 @@ static JanetSlot janetc_if(JanetFopts opts, int32_t argn, const Janet *argv) {
    /* Get options */
    condopts = janetc_fopts_default(c);
    bodyopts = opts;
+    bodyopts.flags &= ~JANET_FOPTS_ACCEPT_SPLICE;

    /* Set target for compilation */
    target = (drop || tail)
@@ -563,6 +571,7 @@ static JanetSlot janetc_do(JanetFopts opts, int32_t argn, const Janet *argv) {
            subopts.flags = JANET_FOPTS_DROP;
        } else {
            subopts = opts;
+            subopts.flags &= ~JANET_FOPTS_ACCEPT_SPLICE;
        }
        ret = janetc_value(subopts, argv[i]);
        if (i != argn - 1) {
@@ -586,6 +595,7 @@ static JanetSlot janetc_upscope(JanetFopts opts, int32_t argn, const Janet *argv
            subopts.flags = JANET_FOPTS_DROP;
        } else {
            subopts = opts;
+            subopts.flags &= ~JANET_FOPTS_ACCEPT_SPLICE;
        }
        ret = janetc_value(subopts, argv[i]);
        if (i != argn - 1) {
@@ -958,12 +968,26 @@ static JanetSlot janetc_fn(JanetFopts opts, int32_t argn, const Janet *argv) {
    max_arity = (vararg || allow_extra) ? INT32_MAX : arity;
    if (!seenopt) min_arity = arity;

-    /* Check for self ref */
+    /* Check for self ref (also avoid if arguments shadow own name) */
    if (selfref) {
-        JanetSlot slot = janetc_farslot(c);
-        slot.flags = JANET_SLOT_NAMED | JANET_FUNCTION;
-        janetc_emit_s(c, JOP_LOAD_SELF, slot, 1);
-        janetc_nameslot(c, janet_unwrap_symbol(head), slot);
+        /* Check if the parameters shadow the function name. If so, don't
+         * emit JOP_LOAD_SELF and add a binding since that most users
+         * seem to expect that function parameters take precedence over the
+         * function name */
+        const uint8_t *sym = janet_unwrap_symbol(head);
+        int32_t len = janet_v_count(c->scope->syms);
+        int found = 0;
+        for (int32_t i = 0; i < len; i++) {
+            if (c->scope->syms[i].sym == sym) {
+                found = 1;
+            }
+        }
+        if (!found) {
+            JanetSlot slot = janetc_farslot(c);
+            slot.flags = JANET_SLOT_NAMED | JANET_FUNCTION;
+            janetc_emit_s(c, JOP_LOAD_SELF, slot, 1);
+            janetc_nameslot(c, sym, slot);
+        }
    }

    /* Compile function body */
--- a/src/core/state.h
+++ b/src/core/state.h
@@ -23,6 +23,7 @@
 #ifndef JANET_STATE_H_defined
 #define JANET_STATE_H_defined

+#include <janet.h>
 #include <stdint.h>

 #ifdef JANET_EV
@@ -135,6 +136,9 @@ struct JanetVM {
    size_t scratch_cap;
    size_t scratch_len;

+    /* Sandbox flags */
+    uint32_t sandbox_flags;
+
    /* Random number generator */
    JanetRNG rng;

@@ -155,6 +159,7 @@ struct JanetVM {
    size_t listener_cap;
    size_t extra_listeners;
    JanetTable threaded_abstracts; /* All abstract types that can be shared between threads (used in this thread) */
+    JanetTable active_tasks; /* All possibly live task fibers - used just for tracking */
 #ifdef JANET_WINDOWS
    void **iocp;
 #elif defined(JANET_EV_EPOLL)
--- a/src/core/string.c
+++ b/src/core/string.c
@@ -364,14 +364,13 @@ JANET_CORE_FN(cfun_string_findall,

 struct replace_state {
    struct kmp_state kmp;
-    const uint8_t *subst;
-    int32_t substlen;
+    Janet subst;
 };

 static void replacesetup(int32_t argc, Janet *argv, struct replace_state *s) {
    janet_arity(argc, 3, 4);
    JanetByteView pat = janet_getbytes(argv, 0);
-    JanetByteView subst = janet_getbytes(argv, 1);
+    Janet subst = argv[1];
    JanetByteView text = janet_getbytes(argv, 2);
    int32_t start = 0;
    if (argc == 4) {
@@ -380,13 +379,14 @@ static void replacesetup(int32_t argc, Janet *argv, struct replace_state *s) {
    }
    kmp_init(&s->kmp, text.bytes, text.len, pat.bytes, pat.len);
    s->kmp.i = start;
-    s->subst = subst.bytes;
-    s->substlen = subst.len;
+    s->subst = subst;
 }

 JANET_CORE_FN(cfun_string_replace,
              "(string/replace patt subst str)",
              "Replace the first occurrence of `patt` with `subst` in the string `str`. "
+              "If `subst` is a function, it will be called with `patt` only if a match is found, "
+              "and should return the actual replacement text to use. "
              "Will return the new string if `patt` is found, otherwise returns `str`.") {
    int32_t result;
    struct replace_state s;
@@ -397,10 +397,11 @@ JANET_CORE_FN(cfun_string_replace,
        kmp_deinit(&s.kmp);
        return janet_stringv(s.kmp.text, s.kmp.textlen);
    }
-    buf = janet_string_begin(s.kmp.textlen - s.kmp.patlen + s.substlen);
+    JanetByteView subst = janet_text_substitution(&s.subst, s.kmp.text + result, s.kmp.patlen, NULL);
+    buf = janet_string_begin(s.kmp.textlen - s.kmp.patlen + subst.len);
    safe_memcpy(buf, s.kmp.text, result);
-    safe_memcpy(buf + result, s.subst, s.substlen);
-    safe_memcpy(buf + result + s.substlen,
+    safe_memcpy(buf + result, subst.bytes, subst.len);
+    safe_memcpy(buf + result + subst.len,
                s.kmp.text + result + s.kmp.patlen,
                s.kmp.textlen - result - s.kmp.patlen);
    kmp_deinit(&s.kmp);
@@ -411,6 +412,8 @@ JANET_CORE_FN(cfun_string_replaceall,
              "(string/replace-all patt subst str)",
              "Replace all instances of `patt` with `subst` in the string `str`. Overlapping "
              "matches will not be counted, only the first match in such a span will be replaced. "
+              "If `subst` is a function, it will be called with `patt` once for each match, "
+              "and should return the actual replacement text to use. "
              "Will return the new string if `patt` is found, otherwise returns `str`.") {
    int32_t result;
    struct replace_state s;
@@ -419,8 +422,9 @@ JANET_CORE_FN(cfun_string_replaceall,
    replacesetup(argc, argv, &s);
    janet_buffer_init(&b, s.kmp.textlen);
    while ((result = kmp_next(&s.kmp)) >= 0) {
+        JanetByteView subst = janet_text_substitution(&s.subst, s.kmp.text + result, s.kmp.patlen, NULL);
        janet_buffer_push_bytes(&b, s.kmp.text + lastindex, result - lastindex);
-        janet_buffer_push_bytes(&b, s.subst, s.substlen);
+        janet_buffer_push_bytes(&b, subst.bytes, subst.len);
        lastindex = result + s.kmp.patlen;
        kmp_seti(&s.kmp, lastindex);
    }
--- a/src/core/util.c
+++ b/src/core/util.c
@@ -92,8 +92,8 @@ const char *const janet_signal_names[14] = {
    "user5",
    "user6",
    "user7",
-    "user8",
-    "user9"
+    "interrupt",
+    "await"
 };

 const char *const janet_status_names[16] = {
@@ -109,8 +109,8 @@ const char *const janet_status_names[16] = {
    "user5",
    "user6",
    "user7",
-    "user8",
-    "user9",
+    "interrupted",
+    "suspended",
    "new",
    "alive"
 };
@@ -118,6 +118,7 @@ const char *const janet_status_names[16] = {
 #ifndef JANET_PRF

 int32_t janet_string_calchash(const uint8_t *str, int32_t len) {
+    if (NULL == str) return 5381;
    const uint8_t *end = str + len;
    uint32_t hash = 5381;
    while (str < end)
@@ -662,6 +663,59 @@ JanetBinding janet_binding_from_entry(Janet entry) {
    return binding;
 }

+/* If the value at the given address can be coerced to a byte view,
+   return that byte view. If it can't, replace the value at the address
+   with the result of janet_to_string, and return a byte view over that
+   string. */
+static JanetByteView memoize_byte_view(Janet *value) {
+    JanetByteView result;
+    if (!janet_bytes_view(*value, &result.bytes, &result.len)) {
+        JanetString str = janet_to_string(*value);
+        *value = janet_wrap_string(str);
+        result.bytes = str;
+        result.len = janet_string_length(str);
+    }
+    return result;
+}
+
+static JanetByteView to_byte_view(Janet value) {
+    JanetByteView result;
+    if (!janet_bytes_view(value, &result.bytes, &result.len)) {
+        JanetString str = janet_to_string(value);
+        result.bytes = str;
+        result.len = janet_string_length(str);
+    }
+    return result;
+}
+
+JanetByteView janet_text_substitution(
+    Janet *subst,
+    const uint8_t *bytes,
+    uint32_t len,
+    JanetArray *extra_argv) {
+    int32_t extra_argc = extra_argv == NULL ? 0 : extra_argv->count;
+    JanetType type = janet_type(*subst);
+    switch (type) {
+        case JANET_FUNCTION:
+        case JANET_CFUNCTION: {
+            int32_t argc = 1 + extra_argc;
+            Janet *argv = janet_tuple_begin(argc);
+            argv[0] = janet_stringv(bytes, len);
+            for (int32_t i = 0; i < extra_argc; i++) {
+                argv[i + 1] = extra_argv->data[i];
+            }
+            janet_tuple_end(argv);
+            if (type == JANET_FUNCTION) {
+                return to_byte_view(janet_call(janet_unwrap_function(*subst), argc, argv));
+            } else {
+                return to_byte_view(janet_unwrap_cfunction(*subst)(argc, argv));
+            }
+        }
+        default:
+            return memoize_byte_view(subst);
+    }
+}
+
 JanetBinding janet_resolve_ext(JanetTable *env, const uint8_t *sym) {
    Janet entry = janet_table_get(env, janet_wrap_symbol(sym));
    return janet_binding_from_entry(entry);
--- a/src/core/util.h
+++ b/src/core/util.h
@@ -93,6 +93,11 @@ void janet_buffer_format(
    Janet *argv);
 Janet janet_next_impl(Janet ds, Janet key, int is_interpreter);
 JanetBinding janet_binding_from_entry(Janet entry);
+JanetByteView janet_text_substitution(
+    Janet *subst,
+    const uint8_t *bytes,
+    uint32_t len,
+    JanetArray *extra_args);

 /* Registry functions */
 void janet_registry_put(
--- a/src/core/value.c
+++ b/src/core/value.c
@@ -272,6 +272,7 @@ int janet_equals(Janet x, Janet y) {
                const Janet *t1 = janet_unwrap_tuple(x);
                const Janet *t2 = janet_unwrap_tuple(y);
                if (t1 == t2) break;
+                if (JANET_TUPLE_FLAG_BRACKETCTOR & (janet_tuple_flag(t1) ^ janet_tuple_flag(t2))) return 0;
                if (janet_tuple_hash(t1) != janet_tuple_hash(t2)) return 0;
                if (janet_tuple_length(t1) != janet_tuple_length(t2)) return 0;
                push_traversal_node(janet_tuple_head(t1), janet_tuple_head(t2), 0);
@@ -321,6 +322,7 @@ int32_t janet_hash(Janet x) {
            break;
        case JANET_TUPLE:
            hash = janet_tuple_hash(janet_unwrap_tuple(x));
+            hash += (janet_tuple_flag(janet_unwrap_tuple(x)) & JANET_TUPLE_FLAG_BRACKETCTOR) ? 1 : 0;
            break;
        case JANET_STRUCT:
            hash = janet_struct_hash(janet_unwrap_struct(x));
@@ -412,6 +414,9 @@ int janet_compare(Janet x, Janet y) {
            case JANET_TUPLE: {
                const Janet *lhs = janet_unwrap_tuple(x);
                const Janet *rhs = janet_unwrap_tuple(y);
+                if (JANET_TUPLE_FLAG_BRACKETCTOR & (janet_tuple_flag(lhs) ^ janet_tuple_flag(rhs))) {
+                    return (janet_tuple_flag(lhs) & JANET_TUPLE_FLAG_BRACKETCTOR) ? 1 : -1;
+                }
                push_traversal_node(janet_tuple_head(lhs), janet_tuple_head(rhs), 1);
                break;
            }
--- a/src/core/vm.c
+++ b/src/core/vm.c
@@ -1559,6 +1559,9 @@ int janet_init(void) {
    janet_vm.scratch_len = 0;
    janet_vm.scratch_cap = 0;

+    /* Sandbox flags */
+    janet_vm.sandbox_flags = 0;
+
    /* Initialize registry */
    janet_vm.registry = NULL;
    janet_vm.registry_cap = 0;
@@ -1600,6 +1603,18 @@ int janet_init(void) {
    return 0;
 }

+/* Disable some features at runtime with no way to re-enable them */
+void janet_sandbox(uint32_t flags) {
+    janet_sandbox_assert(JANET_SANDBOX_SANDBOX);
+    janet_vm.sandbox_flags |= flags;
+}
+
+void janet_sandbox_assert(uint32_t forbidden_flags) {
+    if (forbidden_flags & janet_vm.sandbox_flags) {
+        janet_panic("operation forbidden by sandbox");
+    }
+}
+
 /* Clear all memory associated with the VM */
 void janet_deinit(void) {
    janet_clear_memory();
--- a/src/include/janet.h
+++ b/src/include/janet.h
@@ -280,10 +280,11 @@ extern "C" {
 #ifndef JANET_NO_NANBOX
 #ifdef JANET_32
 #define JANET_NANBOX_32
-#elif defined(__x86_64__) || defined(_WIN64)
+#elif defined(__x86_64__) || defined(_WIN64) || defined(__riscv)
 /* We will only enable nanboxing by default on 64 bit systems
- * on x86. This is mainly because the approach is tied to the
- * implicit 47 bit address space. */
+ * for x64 and risc-v. This is mainly because the approach is tied to the
+ * implicit 47 bit address space. Many arches allow/require this, but not all,
+ * and it requires cooperation from the OS. ARM should also work in many configurations. */
 #define JANET_NANBOX_64
 #endif
 #endif
@@ -1584,8 +1585,10 @@ JANET_API Janet janet_array_pop(JanetArray *array);
 JANET_API Janet janet_array_peek(JanetArray *array);

 /* Buffer functions */
+#define JANET_BUFFER_FLAG_NO_REALLOC 0x10000
 JANET_API JanetBuffer *janet_buffer(int32_t capacity);
 JANET_API JanetBuffer *janet_buffer_init(JanetBuffer *buffer, int32_t capacity);
+JANET_API JanetBuffer *janet_pointer_buffer_unsafe(void *memory, int32_t capacity, int32_t count);
 JANET_API void janet_buffer_deinit(JanetBuffer *buffer);
 JANET_API void janet_buffer_ensure(JanetBuffer *buffer, int32_t capacity, int32_t growth);
 JANET_API void janet_buffer_setcount(JanetBuffer *buffer, int32_t count);
@@ -1684,6 +1687,7 @@ JANET_API void janet_table_clear(JanetTable *table);
 JANET_API JanetFiber *janet_fiber(JanetFunction *callee, int32_t capacity, int32_t argc, const Janet *argv);
 JANET_API JanetFiber *janet_fiber_reset(JanetFiber *fiber, JanetFunction *callee, int32_t argc, const Janet *argv);
 JANET_API JanetFiberStatus janet_fiber_status(JanetFiber *fiber);
+JANET_API int janet_fiber_can_resume(JanetFiber *fiber);
 JANET_API JanetFiber *janet_current_fiber(void);
 JANET_API JanetFiber *janet_root_fiber(void);

@@ -1798,6 +1802,24 @@ JANET_API Janet janet_mcall(const char *name, int32_t argc, Janet *argv);
 JANET_API void janet_stacktrace(JanetFiber *fiber, Janet err);
 JANET_API void janet_stacktrace_ext(JanetFiber *fiber, Janet err, const char *prefix);

+/* Sandboxing API */
+#define JANET_SANDBOX_SANDBOX 1
+#define JANET_SANDBOX_SUBPROCESS 2
+#define JANET_SANDBOX_NET_CONNECT 4
+#define JANET_SANDBOX_NET_LISTEN 8
+#define JANET_SANDBOX_FFI 16
+#define JANET_SANDBOX_FS_WRITE 32
+#define JANET_SANDBOX_FS_READ 64
+#define JANET_SANDBOX_HRTIME 128
+#define JANET_SANDBOX_ENV 256
+#define JANET_SANDBOX_DYNAMIC_MODULES 512
+#define JANET_SANDBOX_FS_TEMP 1024
+#define JANET_SANDBOX_FS (JANET_SANDBOX_FS_WRITE | JANET_SANDBOX_FS_READ | JANET_SANDBOX_FS_TEMP)
+#define JANET_SANDBOX_NET (JANET_SANDBOX_NET_CONNECT | JANET_SANDBOX_NET_LISTEN)
+#define JANET_SANDBOX_ALL (UINT32_MAX)
+JANET_API void janet_sandbox(uint32_t flags);
+JANET_API void janet_sandbox_assert(uint32_t forbidden_flags);
+
 /* Scratch Memory API */
 typedef void (*JanetScratchFinalizer)(void *);

@@ -1856,7 +1878,7 @@ JANET_API Janet janet_resolve_core(const char *name);
 /* sourcemaps only */
 #define JANET_REG_S(JNAME, CNAME) {JNAME, CNAME, NULL, __FILE__, CNAME##_sourceline_}
 #define JANET_FN_S(CNAME, USAGE, DOCSTRING) \
-    static int32_t CNAME##_sourceline_ = __LINE__; \
+    static const int32_t CNAME##_sourceline_ = __LINE__; \
    Janet CNAME (int32_t argc, Janet *argv)
 #define JANET_DEF_S(ENV, JNAME, VAL, DOC) \
    janet_def_sm(ENV, JNAME, VAL, NULL, __FILE__, __LINE__)
@@ -1872,7 +1894,7 @@ JANET_API Janet janet_resolve_core(const char *name);
 /* sourcemaps and docstrings */
 #define JANET_REG_SD(JNAME, CNAME) {JNAME, CNAME, CNAME##_docstring_, __FILE__, CNAME##_sourceline_}
 #define JANET_FN_SD(CNAME, USAGE, DOCSTRING) \
-    static int32_t CNAME##_sourceline_ = __LINE__; \
+    static const int32_t CNAME##_sourceline_ = __LINE__; \
    static const char CNAME##_docstring_[] = USAGE "\n\n" DOCSTRING; \
    Janet CNAME (int32_t argc, Janet *argv)
 #define JANET_DEF_SD(ENV, JNAME, VAL, DOC) \
@@ -1946,6 +1968,7 @@ JANET_API JanetTable *janet_gettable(const Janet *argv, int32_t n);
 JANET_API JanetStruct janet_getstruct(const Janet *argv, int32_t n);
 JANET_API JanetString janet_getstring(const Janet *argv, int32_t n);
 JANET_API const char *janet_getcstring(const Janet *argv, int32_t n);
+JANET_API const char *janet_getcbytes(const Janet *argv, int32_t n);
 JANET_API JanetSymbol janet_getsymbol(const Janet *argv, int32_t n);
 JANET_API JanetKeyword janet_getkeyword(const Janet *argv, int32_t n);
 JANET_API JanetBuffer *janet_getbuffer(const Janet *argv, int32_t n);
@@ -1975,6 +1998,7 @@ JANET_API JanetTuple janet_opttuple(const Janet *argv, int32_t argc, int32_t n,
 JANET_API JanetStruct janet_optstruct(const Janet *argv, int32_t argc, int32_t n, JanetStruct dflt);
 JANET_API JanetString janet_optstring(const Janet *argv, int32_t argc, int32_t n, JanetString dflt);
 JANET_API const char *janet_optcstring(const Janet *argv, int32_t argc, int32_t n, const char *dflt);
+JANET_API const char *janet_optcbytes(const Janet *argv, int32_t argc, int32_t n, const char *dflt);
 JANET_API JanetSymbol janet_optsymbol(const Janet *argv, int32_t argc, int32_t n, JanetString dflt);
 JANET_API JanetKeyword janet_optkeyword(const Janet *argv, int32_t argc, int32_t n, JanetString dflt);
 JANET_API JanetFiber *janet_optfiber(const Janet *argv, int32_t argc, int32_t n, JanetFiber *dflt);
--- a/src/mainclient/shell.c
+++ b/src/mainclient/shell.c
@@ -30,6 +30,7 @@
 #ifdef _WIN32
 #include <windows.h>
 #include <shlwapi.h>
+#include <versionhelpers.h>
 #ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
 #define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
 #endif
@@ -146,9 +147,13 @@ static void setup_console_output(void) {
    HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
    DWORD dwMode = 0;
    GetConsoleMode(hOut, &dwMode);
-    dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+    if (IsWindows10OrGreater()) {
+        dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+    }
    SetConsoleMode(hOut, dwMode);
-    SetConsoleOutputCP(65001);
+    if (IsValidCodePage(65001)) {
+        SetConsoleOutputCP(65001);
+    }
 }

 /* Ansi terminal raw mode */
@@ -160,8 +165,10 @@ static int rawmode(void) {
    dwMode &= ~ENABLE_LINE_INPUT;
    dwMode &= ~ENABLE_INSERT_MODE;
    dwMode &= ~ENABLE_ECHO_INPUT;
-    dwMode |= ENABLE_VIRTUAL_TERMINAL_INPUT;
-    dwMode &= ~ENABLE_PROCESSED_INPUT;
+    if (IsWindows10OrGreater()) {
+        dwMode |= ENABLE_VIRTUAL_TERMINAL_INPUT;
+        dwMode &= ~ENABLE_PROCESSED_INPUT;
+    }
    if (!SetConsoleMode(hOut, dwMode)) return 1;
    gbl_israwmode = 1;
    return 0;
@@ -176,8 +183,10 @@ static void norawmode(void) {
    dwMode |= ENABLE_LINE_INPUT;
    dwMode |= ENABLE_INSERT_MODE;
    dwMode |= ENABLE_ECHO_INPUT;
-    dwMode &= ~ENABLE_VIRTUAL_TERMINAL_INPUT;
-    dwMode |= ENABLE_PROCESSED_INPUT;
+    if (IsWindows10OrGreater()) {
+        dwMode &= ~ENABLE_VIRTUAL_TERMINAL_INPUT;
+        dwMode |= ENABLE_PROCESSED_INPUT;
+    }
    SetConsoleMode(hOut, dwMode);
    gbl_israwmode = 0;
 }
--- a/test/helper.janet
+++ b/test/helper.janet
@@ -24,6 +24,11 @@
  (def errsym (keyword (gensym)))
  ~(assert (= ,errsym (try (do ,;forms) ([_] ,errsym))) ,msg))

+(defn check-compile-error
+  [form]
+  (def result (compile form))
+  (assert (table? result) (string/format "expected compilation error for %j, but compiled without error" form)))
+
 (defmacro assert-no-error
  [msg & forms]
  (def errsym (keyword (gensym)))
--- a/test/suite0001.janet
+++ b/test/suite0001.janet
@@ -228,7 +228,7 @@

 (assert (= 14 (sum (map inc @[1 2 3 4]))) "sum map")
 (def myfun (juxt + - * /))
-(assert (= '[2 -2 2 0.5] (myfun 2)) "juxt")
+(assert (= [2 -2 2 0.5] (myfun 2)) "juxt")

 # Case statements
 (assert
@@ -252,6 +252,9 @@
 (def xs (apply tuple (seq [x :down [8 -2] :when (even? x)] (tuple (/ x 2) x))))
 (assert (= xs '((4 8) (3 6) (2 4) (1 2) (0 0))) "seq macro 2")

+(def xs (catseq [x :range [0 3]] [x x]))
+(assert (deep= xs @[0 0 1 1 2 2]) "catseq")
+
 # :range-to and :down-to
 (assert (deep= (seq [x :range-to [0 10]] x) (seq [x :range [0 11]] x)) "loop :range-to")
 (assert (deep= (seq [x :down-to [10 0]] x) (seq [x :down [10 -1]] x)) "loop :down-to")
@@ -342,6 +345,8 @@
 (assert (= (and 0 1 nil) nil) "and 0 1 nil")
 (assert (= (and 1) 1) "and 1")
 (assert (= (and) true) "and with no arguments")
+(assert (= (and 1 true) true) "and with trailing true")
+(assert (= (and 1 true 2) 2) "and with internal true")

 (assert (= (or true true) true) "or true true")
 (assert (= (or true false) true) "or true false")
--- a/test/suite0002.janet
+++ b/test/suite0002.janet
@@ -41,10 +41,10 @@

 # Looping idea
 (def xs
-  (seq [x :in '[-1 0 1] y :in '[-1 0 1] :when (not= x y 0)] (tuple x y)))
+  (seq [x :in [-1 0 1] y :in [-1 0 1] :when (not= x y 0)] (tuple x y)))
 (def txs (apply tuple xs))

-(assert (= txs '[[-1 -1] [-1 0] [-1 1] [0 -1] [0 1] [1 -1] [1 0] [1 1]]) "nested seq")
+(assert (= txs [[-1 -1] [-1 0] [-1 1] [0 -1] [0 1] [1 -1] [1 0] [1 1]]) "nested seq")

 # Generators
 (def gen (generate [x :range [0 100] :when (pos? (% x 4))] x))
@@ -72,6 +72,10 @@
 (assert (= (string/replace "X" "." "XXX...XXX...XXX")  ".XX...XXX...XXX") "string/replace 1")
 (assert (= (string/replace-all "X" "." "XXX...XXX...XXX") "...............") "string/replace-all 1")
 (assert (= (string/replace-all "XX" "." "XXX...XXX...XXX") ".X....X....X") "string/replace-all 2")
+(assert (= (string/replace "xx" string/ascii-upper "xxyxyxyxxxy") "XXyxyxyxxxy") "string/replace function")
+(assert (= (string/replace-all "xx" string/ascii-upper "xxyxyxyxxxy") "XXyxyxyXXxy") "string/replace-all function")
+(assert (= (string/replace "x" 12 "xyx") "12yx") "string/replace stringable")
+(assert (= (string/replace-all "x" 12 "xyx") "12y12") "string/replace-all stringable")
 (assert (= (string/ascii-lower "ABCabc&^%!@:;.") "abcabc&^%!@:;.") "string/ascii-lower")
 (assert (= (string/ascii-upper "ABCabc&^%!@:;.") "ABCABC&^%!@:;.") "string/ascii-lower")
 (assert (= (string/reverse "") "") "string/reverse 1")
--- a/test/suite0003.janet
+++ b/test/suite0003.janet
@@ -349,7 +349,7 @@
 (def janet-longstring
  ~{:delim (some "`")
    :open (capture :delim :n)
-    :close (cmt (* (not (> -1 "`")) (-> :n) (<- :delim)) ,=)
+    :close (cmt (* (not (> -1 "`")) (-> :n) (<- (backmatch :n))) ,=)
    :main (* :open (any (if-not :close 1)) :close -1)})

 (check-match janet-longstring "`john" false)
@@ -359,6 +359,7 @@
 (check-match janet-longstring "``  ``" true)
 (check-match janet-longstring "``` `` ```" true)
 (check-match janet-longstring "``  ```" false)
+(check-match janet-longstring "`a``b`" false)

 # Line and column capture

--- a/test/suite0005.janet
+++ b/test/suite0005.janet
@@ -83,8 +83,13 @@
 (assert (deep= (drop 10 []) []) "drop 2")
 (assert (deep= (drop 0 [1 2 3 4 5]) [1 2 3 4 5]) "drop 3")
 (assert (deep= (drop 10 [1 2 3]) []) "drop 4")
-(assert (deep= (drop -2 [:a :b :c]) [:a :b :c]) "drop 5")
-(assert-error :invalid-type (drop 3 {}) "drop 6")
+(assert (deep= (drop -1 [1 2 3]) [1 2]) "drop 5")
+(assert (deep= (drop -10 [1 2 3]) []) "drop 6")
+(assert (deep= (drop 1 "abc") "bc") "drop 7")
+(assert (deep= (drop 10 "abc") "") "drop 8")
+(assert (deep= (drop -1 "abc") "ab") "drop 9")
+(assert (deep= (drop -10 "abc") "") "drop 10")
+(assert-error :invalid-type (drop 3 {}) "drop 11")

 # drop-until

@@ -98,4 +103,18 @@
 # Quasiquote bracketed tuples
 (assert (= (tuple/type ~[1 2 3]) (tuple/type '[1 2 3])) "quasiquote bracket tuples")

+# No useless splices
+(check-compile-error '((splice [1 2 3]) 0))
+(check-compile-error '(if ;[1 2] 5))
+(check-compile-error '(while ;[1 2 3] (print :hi)))
+(check-compile-error '(def x ;[1 2 3]))
+(check-compile-error '(fn [x] ;[x 1 2 3]))
+
+# No splice propagation
+(check-compile-error '(+ 1 (do ;[2 3 4]) 5))
+(check-compile-error '(+ 1 (upscope ;[2 3 4]) 5))
+# compiler inlines when condition is constant, ensure that optimization doesn't break
+(check-compile-error '(+ 1 (if true ;[3 4])))
+(check-compile-error '(+ 1 (if false nil ;[3 4])))
+
 (end-suite)
--- a/test/suite0006.janet
+++ b/test/suite0006.janet
@@ -261,4 +261,12 @@
 (modcheck -10 3)
 (modcheck -10 -3)

+# Check for issue #1130
+(var d (int/s64 7))
+(mod 0 d)
+
+(var d (int/s64 7))
+(def result (seq [n :in (range -21 0)] (mod n d)))
+(assert (deep= result (map int/s64 @[0 1 2 3 4 5 6 0 1 2 3 4 5 6 0 1 2 3 4 5 6])) "issue #1130")
+
 (end-suite)
--- a/test/suite0007.janet
+++ b/test/suite0007.janet
@@ -60,7 +60,7 @@
    :buffer (/ '(* "@" :bytes) (constant :string))
    :long-bytes {:delim (some "`")
                 :open (capture :delim :n)
-                 :close (cmt (* (not (> -1 "`")) (-> :n) ':delim) ,=)
+                 :close (cmt (* (not (> -1 "`")) (-> :n) '(backmatch :n)) ,=)
                 :main (drop (* :open (any (if-not :close 1)) :close))}
    :long-string (/ ':long-bytes (constant :string))
    :long-buffer (/ '(* "@" :long-bytes) (constant :string))
@@ -239,6 +239,12 @@
 (assert (= (os/mktime (os/date now true) true) now) "local os/mktime")
 (assert (= (os/mktime {:year 1970}) 0) "os/mktime default values")

+# OS strftime test
+
+(assert (= (os/strftime "%Y-%m-%d %H:%M:%S" 0) "1970-01-01 00:00:00") "strftime UTC epoch")
+(assert (= (os/strftime "%Y-%m-%d %H:%M:%S" 1388608200) "2014-01-01 20:30:00") "strftime january 2014")
+(assert (= (try (os/strftime "%%%d%t") ([err] err)) "invalid conversion specifier '%t'") "invalid conversion specifier")
+
 # Appending buffer to self

 (with-dyns [:out @""]
@@ -294,9 +300,12 @@
 (assert-error "comptime issue" (eval '(comptime (error "oops"))))

 (with [f (file/temp)]
+  (assert (= 0 (file/tell f)) "start of file")
  (file/write f "foo\n")
+  (assert (= 4 (file/tell f)) "after written string")
  (file/flush f)
  (file/seek f :set 0)
+  (assert (= 0 (file/tell f)) "start of file again")
  (assert (= (string (file/read f :all)) "foo\n") "temp files work"))

 (var counter 0)
--- a/test/suite0008.janet
+++ b/test/suite0008.janet
@@ -330,7 +330,6 @@ neldb\0\0\0\xD8\x05printG\x01\0\xDE\xDE\xDE'\x03\0marshal_tes/\x02
 (assert (deep= (peg/find-all '"/" p) @[0 4 10 14]) "peg find-all")

 # Peg replace and replace-all
-(var ti 0)
 (defn check-replacer
  [x y z]
  (assert (= (string/replace x y z) (string (peg/replace x y z))) "replacer test replace")
@@ -339,6 +338,32 @@ neldb\0\0\0\xD8\x05printG\x01\0\xDE\xDE\xDE'\x03\0marshal_tes/\x02
 (check-replacer "abc" "Z" "")
 (check-replacer "aba" "ZZZZZZ" "ababababababa")
 (check-replacer "aba" "" "ababababababa")
+(check-replacer "aba" string/ascii-upper "ababababababa")
+(check-replacer "aba" 123 "ababababababa")
+
+(assert (= (string (peg/replace-all ~(set "ab") string/ascii-upper "abcaa"))
+           "ABcAA")
+        "peg/replace-all cfunction")
+(assert (= (string (peg/replace-all ~(set "ab") |$ "abcaa"))
+           "abcaa")
+        "peg/replace-all function")
+
+(defn peg-test [name f peg subst text expected]
+  (assert (= (string (f peg subst text)) expected) name))
+
+(peg-test "peg/replace has access to captures"
+  peg/replace
+  ~(sequence "." (capture (set "ab")))
+  (fn [str char] (string/format "%s -> %s, " str (string/ascii-upper char)))
+  ".a.b.c"
+  ".a -> A, .b.c")
+
+(peg-test "peg/replace-all has access to captures"
+  peg/replace-all
+  ~(sequence "." (capture (set "ab")))
+  (fn [str char] (string/format "%s -> %s, " str (string/ascii-upper char)))
+  ".a.b.c"
+  ".a -> A, .b -> B, .c")

 # Peg bug
 (assert (deep= @[] (peg/match '(any 1) @"")) "peg empty pattern 1")
--- a/test/suite0010.janet
+++ b/test/suite0010.janet
@@ -44,6 +44,43 @@
 (assert (= :brackets (tuple/type (1 (macex1 '~[1 2 3 4])))) "macex1 qq bracket tuple")
 (assert (deep= (macex1 '~@[1 2 3 4 ,blah]) '~@[1 2 3 4 ,blah]) "macex1 qq array")

+# Sourcemaps in threading macros
+(defn check-threading [macro expansion]
+  (def expanded (macex1 (tuple macro 0 '(x) '(y))))
+  (assert (= expanded expansion) (string macro " expansion value"))
+  (def smap-x (tuple/sourcemap (get expanded 1)))
+  (def smap-y (tuple/sourcemap expanded))
+  (def line first)
+  (defn column [t] (t 1))
+  (assert (not= smap-x [-1 -1]) (string macro " x sourcemap existence"))
+  (assert (not= smap-y [-1 -1]) (string macro " y sourcemap existence"))
+  (assert (or (< (line smap-x) (line smap-y))
+              (and (= (line smap-x) (line smap-y))
+                   (< (column smap-x) (column smap-y))))
+          (string macro " relation between x and y sourcemap")))
+
+(check-threading '-> '(y (x 0)))
+(check-threading '->> '(y (x 0)))
+
+# keep-syntax
+(let [brak '[1 2 3]
+      par '(1 2 3)]
+
+  (tuple/setmap brak 2 1)
+
+  (assert (deep= (keep-syntax brak @[1 2 3]) @[1 2 3]) "keep-syntax brackets ignore array")
+  (assert (= (keep-syntax! brak @[1 2 3]) '[1 2 3]) "keep-syntax! brackets replace array")
+
+  (assert (= (keep-syntax! par (map inc @[1 2 3])) '(2 3 4)) "keep-syntax! parens coerce array")
+  (assert (not= (keep-syntax! brak @[1 2 3]) '(1 2 3)) "keep-syntax! brackets not parens")
+  (assert (not= (keep-syntax! par @[1 2 3]) '[1 2 3]) "keep-syntax! parens not brackets")
+  (assert (= (tuple/sourcemap brak)
+             (tuple/sourcemap (keep-syntax! brak @[1 2 3]))) "keep-syntax! brackets source map")
+
+  (keep-syntax par brak)
+  (assert (not= (tuple/sourcemap brak) (tuple/sourcemap par)) "keep-syntax no mutate")
+  (assert (= (keep-syntax 1 brak) brak) "keep-syntax brackets ignore type"))
+
 # Cancel test
 (def f (fiber/new (fn [&] (yield 1) (yield 2) (yield 3) 4) :yti))
 (assert (= 1 (resume f)) "cancel resume 1")
--- a/test/suite0015.janet
+++ b/test/suite0015.janet
@@ -19,7 +19,6 @@
               symbolslots)
        "symbolslots survive disasm/asm")

-# need to fix upvalues
 (comment
  (setdyn *debug* true)
  (setdyn :pretty-format "%.40M")
@@ -41,4 +40,9 @@
                 [3 7 4 'z]])
        "arg & inner symbolslots")

+# buffer/push-at
+(assert (deep= @"abc456" (buffer/push-at @"abc123" 3 "456")) "buffer/push-at 1")
+(assert (deep= @"abc456789" (buffer/push-at @"abc123" 3 "456789")) "buffer/push-at 2")
+(assert (deep= @"abc423" (buffer/push-at @"abc123" 3 "4")) "buffer/push-at 3")
+
 (end-suite)
Author	SHA1	Message	Date
Calvin Rose	358f5a03bf	Version bump to 1.28.0	2023-05-13 09:59:55 -05:00
Calvin Rose	fba1fdabe4	Update short-fn to fix #1123 Symbols are renamed on expansion to avoid the issue.	2023-05-13 09:44:30 -05:00
Calvin Rose	d42afd21e5	Merge branch 'master' of github.com:janet-lang/janet	2023-05-12 19:08:35 -05:00
Calvin Rose	20ada86761	Fix NAN typo.	2023-05-12 19:08:26 -05:00
Calvin Rose	3b353f1855	Merge pull request #1133 from zevv/cross Updated Makefile for better cross-compilation support.	2023-05-12 08:41:54 -05:00
Calvin Rose	1467ab4f93	Copy paste error.	2023-05-11 20:56:12 -05:00
Calvin Rose	7e65c2bdad	Fix #1130 - mod flipped for signed integers.	2023-05-11 18:15:37 -05:00
Calvin Rose	84a4e3e98a	Update CHANGELOG. and format.	2023-05-11 18:03:38 -05:00
Calvin Rose	bcbeedb001	Merge pull request #1128 from zevv/master Added os.strftime()	2023-05-11 18:01:39 -05:00
Calvin Rose	e04b103b5d	Merge pull request #1134 from CosmicToast/const_sourceline Make JANET_FN_S* sourceline const	2023-05-11 17:59:27 -05:00
Chloe Kudryavtsev	ac75b94679	Make JANET_FN_S* sourceline const Otherwise attempts to use it on some platforms cause the following error `error: initializer element is not a compile-time constant` when attempting to use the corresponding `JANET_REG`.	2023-05-11 16:07:34 -04:00
Ico Doornekamp	d3bb06cfd6	Updated Makefile for better cross-compilation support. Building janet requires janet_boot to be run on the host at build time; - $(UNAME) can now be overridden from the make cmdline - Added $(RUN) variable to allow a emulator to be specified - Added ".exe" extension to binaries when using MINGW Examples: Cross compiling for win32 and running under wine: ``` make test \ CC=i686-w64-mingw32-gcc \ LD=i686-w64-mingw32-gcc \ UNAME=MINGW \ RUN=wine Janet 1.27.0-ad7c3bed mingw/x86/gcc - '(doc)' for help ``` Cross compiling for aarch64 and running under qemu: ``` make repl \ CC=aarch64-none-linux-gnu-gcc \ LD=aarch64-none-linux-gnu-gcc \ RUN="qemu-aarch64 -L /tmp/aarch64/" Janet 1.27.0-ad7c3bed linux/aarch64/gcc - '(doc)' for help ```	2023-05-11 07:46:36 +02:00
Ico Doornekamp	5cd729c4c1	Added os.strftime()	2023-05-11 06:08:19 +02:00
Calvin Rose	c9fd2bdf39	Merge branch 'master' of github.com:janet-lang/janet	2023-05-10 18:46:42 -05:00
Calvin Rose	e4be5992b3	Address issue with #1131	2023-05-10 18:43:33 -05:00
Calvin Rose	2ac4988f1b	Merge pull request #1124 from sogaiu/tweak-ev-select-docstring Tweak ev/select docstring	2023-05-08 04:17:25 -05:00
Calvin Rose	19f14adb9e	Update changelog.	2023-05-07 21:07:22 -05:00
Calvin Rose	86de039492	Merge branch 'master' of github.com:janet-lang/janet	2023-05-07 11:54:20 -05:00
Calvin Rose	2360164e4f	Address #1125 - fix ev/select to only take and release locks once. By take and releasing locks twice per channel in the case where nothing is reading, there was an opportunity for ev/select to hang in the multithreaded case. Also silence valgrind/helgrind errors.	2023-05-07 11:54:06 -05:00
Calvin Rose	c93ddceadb	Merge pull request #1122 from CosmicToast/getcbytes Add get/opt cbytes	2023-05-07 10:33:09 -05:00
sogaiu	cd19dec44a	Tweak ev/select docstring	2023-05-07 22:22:33 +09:00
Chloe Kudryavtsev	53ba9c800a	Add get/opt cbytes Like getcstring, but operates on a byteview. When writing bindings (i.e what capi.c is primarily used for), it's common to want to accept a buffer or a string rather than just a string. For this, a byteview is perfect (and why not accept keywords while you're at it?). However, there's no built-in function for getting a cstring out of a byteview, this adds one. This also reformulates getcstring to be an edge-case of getcbytes (simply adding an explicit check for stringness).	2023-05-06 22:13:53 -04:00
Calvin Rose	cabbaded68	Add support for the NO_COLOR environment variable.	2023-05-06 16:33:45 -05:00
Calvin Rose	9bb589f827	update readme	2023-05-06 15:56:27 -05:00
Calvin Rose	c3a06686c2	Merge branch 'shell-win-feature-check'	2023-05-06 15:53:02 -05:00
Calvin Rose	7d57f87007	Address #1121 - disallow extra splices. This turns splices that are ignored into compiler errors. Other alternatives here should also be considered, for example making this a compiler warning rather than an error. For example, the latest spork as of a3ee63c137ee3234987dbbca71b566994ff8ae8c has an error of this kind, but the resulting program does work correctly. Also disallow splice propagation - code of the form (+ 1 (do ;[2 3 4]) 5).	2023-05-06 13:12:31 -05:00
Calvin Rose	4cc4a9d38b	(and ... <truthy-value> true) will return `true` as per docs.	2023-05-06 10:16:05 -05:00
Calvin Rose	02c7cd0194	Merge pull request #1116 from sogaiu/tweak-long-string-peg Tweak long-string\|bytes peg in test suite files	2023-04-30 16:21:12 -05:00
Calvin Rose	696efcb9e2	Add header file.	2023-04-30 12:19:55 -05:00
Calvin Rose	6e9cde8ac1	Add feature check for windows version shell.c Tried to get console working on windows 7 and below	2023-04-30 10:36:42 -05:00
sogaiu	a9fae49671	Tweak long-string\|bytes peg in test suite files	2023-04-30 21:55:43 +09:00
Calvin Rose	440af9fd64	Remove extra allocation in drop.	2023-04-24 09:41:33 -05:00
Calvin Rose	347721ae40	Fix macos behavior - Closes #1097 , Fixes #1015	2023-04-24 09:37:49 -05:00
Calvin Rose	daea91044c	Give different names to the user9 and user8 fiber statuses. These now have semantic menaings that are pretty difficult to work around. Code that tries to maniuplate user8 and user9 signals right now may be affected	2023-04-24 09:19:15 -05:00
Calvin Rose	4ed3f2c662	Merge pull request #1114 from ianthehenry/drop-from-end drop with a negative count now drops from the end	2023-04-24 09:16:10 -05:00
Calvin Rose	3641c8f60a	Merge pull request #1108 from wackbyte/read README grammar and formatting changes	2023-04-24 09:15:07 -05:00
Calvin Rose	e4b68cd940	Merge pull request #1109 from wackbyte/remove-double-space Remove double space in help message	2023-04-24 09:11:45 -05:00
Calvin Rose	b8c936e2fe	Merge pull request #1113 from ianthehenry/catseq add catseq	2023-04-24 09:07:38 -05:00
Calvin Rose	83cd519702	Merge pull request #1112 from ianthehenry/dynamic-replace string and peg replacement functions can now take functions	2023-04-24 09:07:03 -05:00
Ian Henry	54b54f85f3	drop with a negative count now drops from the end	2023-04-23 21:39:14 -07:00
Ian Henry	ccd874fe4e	add catseq	2023-04-23 21:20:01 -07:00
Ian Henry	9dc7e8ed3a	peg replacement functions have access to captures When peg/replace or peg/replace-all are given a function to serve as the text replacement, any captures produced by the PEG are passed as additional arguments to that function.	2023-04-23 09:15:46 -07:00
Ian Henry	485099fd6e	string and peg replacement functions can now take functions Functions will be invoked with the matched text, and their result will be coerced to a string and used as the new replacement text. This also allows passing non-function, non-byteviewable values, which will be converted into strings during replacement (only once, and only if at least one match is found).	2023-04-23 08:36:17 -07:00
wackbyte	d359c6b43e	Remove double space in help message	2023-04-22 21:46:24 -04:00
Calvin Rose	d9ed7a77f8	Merge pull request #1106 from CosmicToast/1105 handle null-byte case in scanformat (fixes #1105)	2023-04-22 15:25:48 -05:00
wackbyte	4238a4ca6a	README grammar and formatting changes	2023-04-20 21:06:33 -04:00
Chloe Kudryavtsev	0902a5a981	improve null format handling there was a request to improve the error message, but the whole function has non-informative errors. (both functions, actually, since the code is duplicated) as such, instead of catching it directly, address the assumption that led to the SIGSEGV and let it be caught by the functions themselves, thus reusing existing error messages (which can then be improved separately).	2023-04-20 11:51:11 -04:00
Chloe Kudryavtsev	f3192303ab	check for NULL in get_fmt_mapping (fixes #1105 ) When there is no format to be found after a %, get_fmt_mapping returns NULL. It then gets called against strlen, which is a typical SEGV. Check for NULL aginst mapping, which signals a null format being specified.	2023-04-19 12:55:25 -04:00
Calvin Rose	bef5bd72c2	Merge pull request #1095 from ml-2/ml Add `keep-syntax` and `keep-syntax!` functions	2023-04-08 10:46:47 -05:00
ML	b6175e4296	Add `keep-syntax` and `keep-syntax!` functions These functions are designed to make it easier to properly preserve the sourcemap and tuple type in macros. This commit also modifies the threading macros to make use of these functions.	2023-04-07 21:09:52 -04:00
Calvin Rose	3858b2e177	Add `ev/all-tasks` to get running and pending root fibers.	2023-04-01 18:57:13 -05:00
Calvin Rose	9a76e77981	Update for undefined behavior sanitizer.	2023-03-24 18:49:21 -05:00
Calvin Rose	8182d640cd	Merge branch 'master' of github.com:janet-lang/janet	2023-03-12 10:33:06 -05:00
Calvin Rose	1c6fda1a5c	Address #1076 - unexpected shadowing behavior While the old behavior was reasonable, it is not spelled out anywhere in the documentation and was incidental rather than intentional. Parameters of the same name of the function should probably take precedence on name collision, following the principle of least surprise.	2023-03-12 10:30:59 -05:00
Calvin Rose	c51db1cf2f	Merge pull request #1081 from ianthehenry/log-gamma-docstring remove quotes in math/log-gamma docstring	2023-03-12 10:17:51 -05:00
Ian Henry	4e7930fc4c	remove quotes around log-gamma	2023-03-11 12:26:45 -08:00
Calvin Rose	3563f8ccdb	Merge pull request #1079 from dressupgeekout/charlotte_dragonfly Some basic fixes for DragonFly	2023-03-08 15:05:51 -06:00
Charlotte Koch	575af763f6	os/which can return :dragonfly While here, document that :bsd is another possible return value.	2023-03-07 06:45:31 -08:00
Charlotte Koch	8b16b9b246	Need to enable __BSD_VISIBLE on DragonFly in conjunction with -std=c99	2023-03-07 06:40:58 -08:00
Calvin Rose	01aab66667	Prepare for 1.27.0 release.	2023-03-05 09:48:25 -06:00
Calvin Rose	aa5c987a94	Change semantics of bracketed tuple equality. Comparison between different bracket and normal tuples will now take into account the delimiter type. This solves strange non-locality issues in the compiler due to this false equality, and is more consistent with Janet's otherwise strong equality philosophy.	2023-03-03 18:24:02 -06:00
Calvin Rose	75229332c8	Merge pull request #1075 from sogaiu/math-rng-int-docs Tweak math/rng-int docs	2023-03-03 18:09:11 -06:00
sogaiu	9d5b1ba838	Tweak math/rng-int docs	2023-02-24 19:55:47 +09:00
Calvin Rose	f27b225b34	Merge pull request #1072 from sogaiu/ftell Add file/tell	2023-02-21 07:13:00 -06:00
sogaiu	3c523d66e9	Add file/tell	2023-02-21 20:19:17 +09:00
Calvin Rose	1144c27c54	Merge pull request #1071 from ianthehenry/number-pegfault fix a segfault in the (number) special	2023-02-20 21:01:33 -06:00
Ian Henry	b442b21d3f	fix a segfault in the (number) special This was an error about the base argument that referenced the tag argument, which might not exist.	2023-02-20 17:07:42 -08:00
Calvin Rose	746ff5307d	Update for more minimal builds.	2023-02-12 12:14:11 -06:00
Calvin Rose	ef85b24d8f	Add optional offset to ffi/write.	2023-02-12 12:08:28 -06:00
Calvin Rose	c55d93512b	Add buffer/push-at for easier manipulation of buffers buffer/blit is difficult to use, and while buffer/push is the easiet buffer manipulation function to use it only appends to the buffer. buffer/push-at lets users manipulate buffers at any index - useful for buffers used as an in-memory databases, for example.	2023-02-12 11:26:00 -06:00
Calvin Rose	2e38f9ba61	Allow passing pointer-buffers to other threads.	2023-02-12 11:07:45 -06:00
Calvin Rose	1cadff8e58	Add ffi/pointer-buffer for easier memory manipulation in FFI. Added underlying buffer support for buffer instances that cannot reallocated underlying memory - useful for (small) memory mapped files and other FFI utilties.	2023-02-12 09:20:05 -06:00
Calvin Rose	d1eba60ba8	Add separate sandbox flag for file/temp Doesn't really impart (much) file systtem information when used, and can be used for a lot of things where file functions are used to process in a stream.	2023-02-09 08:57:53 -06:00
Calvin Rose	057dccad8f	Turn on nanboxing by default for risc-v 64.	2023-02-09 03:09:53 -06:00
Calvin Rose	4285200b4b	Add a sandbox option to disable native modules. Also sort the sandbox docstring list.	2023-02-09 00:19:56 -06:00
Calvin Rose	73c2fbbc2a	Check sandbox capabilities instead of ignoring unknown ones.	2023-02-06 17:38:00 -06:00
Calvin Rose	37b7e170fa	Update changelist.	2023-02-06 12:31:49 -06:00
Calvin Rose	b032d94877	Add sandboxing API. The sandboxing API is meant to make janet a bit more attractive for certain application embedding use cases. The sandboxing API puts limits on what system resources the interpreter can access.	2023-02-06 09:05:57 -06:00