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janet/src/core/io.c

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/*
* Copyright (c) 2022 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef JANET_AMALG
#include "features.h"
#include <janet.h>
#include "util.h"
#endif
#include <stdio.h>
#include <errno.h>
#ifndef JANET_WINDOWS
#include <fcntl.h>
#include <sys/wait.h>
#include <unistd.h>
#endif
static int cfun_io_gc(void *p, size_t len);
static int io_file_get(void *p, Janet key, Janet *out);
static void io_file_marshal(void *p, JanetMarshalContext *ctx);
static void *io_file_unmarshal(JanetMarshalContext *ctx);
static Janet io_file_next(void *p, Janet key);
const JanetAbstractType janet_file_type = {
"core/file",
cfun_io_gc,
NULL,
io_file_get,
NULL,
io_file_marshal,
io_file_unmarshal,
NULL, /* tostring */
NULL, /* compare */
NULL, /* hash */
io_file_next,
JANET_ATEND_NEXT
};
/* Check arguments to fopen */
static int32_t checkflags(const uint8_t *str) {
int32_t flags = 0;
int32_t i;
int32_t len = janet_string_length(str);
if (!len || len > 10)
janet_panic("file mode must have a length between 1 and 10");
switch (*str) {
default:
janet_panicf("invalid flag %c, expected w, a, or r", *str);
break;
case 'w':
flags |= JANET_FILE_WRITE;
break;
case 'a':
flags |= JANET_FILE_APPEND;
break;
case 'r':
flags |= JANET_FILE_READ;
break;
}
for (i = 1; i < len; i++) {
switch (str[i]) {
default:
janet_panicf("invalid flag %c, expected +, b, or n", str[i]);
break;
case '+':
if (flags & JANET_FILE_UPDATE) return -1;
flags |= JANET_FILE_UPDATE;
break;
case 'b':
if (flags & JANET_FILE_BINARY) return -1;
flags |= JANET_FILE_BINARY;
break;
case 'n':
if (flags & JANET_FILE_NONIL) return -1;
flags |= JANET_FILE_NONIL;
break;
}
}
return flags;
}
static void *makef(FILE *f, int32_t flags) {
JanetFile *iof = (JanetFile *) janet_abstract(&janet_file_type, sizeof(JanetFile));
iof->file = f;
iof->flags = flags;
#ifndef JANET_WINDOWS
/* While we would like fopen to set cloexec by default (like O_CLOEXEC) with the e flag, that is
* not standard. */
if (!(flags & JANET_FILE_NOT_CLOSEABLE))
fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
#endif
return iof;
}
JANET_CORE_FN(cfun_io_temp,
"(file/temp)",
"Open an anonymous temporary file that is removed on close. "
"Raises an error on failure.") {
(void)argv;
janet_fixarity(argc, 0);
// XXX use mkostemp when we can to avoid CLOEXEC race.
FILE *tmp = tmpfile();
if (!tmp)
janet_panicf("unable to create temporary file - %s", strerror(errno));
return janet_makefile(tmp, JANET_FILE_WRITE | JANET_FILE_READ | JANET_FILE_BINARY);
}
JANET_CORE_FN(cfun_io_fopen,
"(file/open path &opt mode)",
"Open a file. `path` is an absolute or relative path, and "
"`mode` is a set of flags indicating the mode to open the file in. "
"`mode` is a keyword where each character represents a flag. If the file "
"cannot be opened, returns nil, otherwise returns the new file handle. "
"Mode flags:\n\n"
"* r - allow reading from the file\n\n"
"* w - allow writing to the file\n\n"
"* a - append to the file\n\n"
"Following one of the initial flags, 0 or more of the following flags can be appended:\n\n"
"* b - open the file in binary mode (rather than text mode)\n\n"
"* + - append to the file instead of overwriting it\n\n"
"* n - error if the file cannot be opened instead of returning nil") {
janet_arity(argc, 1, 2);
const uint8_t *fname = janet_getstring(argv, 0);
const uint8_t *fmode;
int32_t flags;
if (argc == 2) {
fmode = janet_getkeyword(argv, 1);
flags = checkflags(fmode);
} else {
fmode = (const uint8_t *)"r";
flags = JANET_FILE_READ;
}
FILE *f = fopen((const char *)fname, (const char *)fmode);
return f ? janet_makefile(f, flags)
: (flags & JANET_FILE_NONIL) ? (janet_panicf("failed to open file %s: %s", fname, strerror(errno)), janet_wrap_nil())
: janet_wrap_nil();
}
/* Read up to n bytes into buffer. */
static void read_chunk(JanetFile *iof, JanetBuffer *buffer, int32_t nBytesMax) {
if (!(iof->flags & (JANET_FILE_READ | JANET_FILE_UPDATE)))
janet_panic("file is not readable");
janet_buffer_extra(buffer, nBytesMax);
size_t ntoread = nBytesMax;
size_t nread = fread((char *)(buffer->data + buffer->count), 1, ntoread, iof->file);
if (nread != ntoread && ferror(iof->file))
janet_panic("could not read file");
buffer->count += (int32_t) nread;
}
/* Read a certain number of bytes into memory */
JANET_CORE_FN(cfun_io_fread,
"(file/read f what &opt buf)",
"Read a number of bytes from a file `f` into a buffer. A buffer `buf` can "
"be provided as an optional third argument, otherwise a new buffer "
"is created. `what` can either be an integer or a keyword. Returns the "
"buffer with file contents. "
"Values for `what`:\n\n"
"* :all - read the whole file\n\n"
"* :line - read up to and including the next newline character\n\n"
"* n (integer) - read up to n bytes from the file") {
janet_arity(argc, 2, 3);
JanetFile *iof = janet_getabstract(argv, 0, &janet_file_type);
if (iof->flags & JANET_FILE_CLOSED) janet_panic("file is closed");
JanetBuffer *buffer;
if (argc == 2) {
buffer = janet_buffer(0);
} else {
buffer = janet_getbuffer(argv, 2);
}
int32_t bufstart = buffer->count;
if (janet_checktype(argv[1], JANET_KEYWORD)) {
const uint8_t *sym = janet_unwrap_keyword(argv[1]);
if (!janet_cstrcmp(sym, "all")) {
int32_t sizeBefore;
do {
sizeBefore = buffer->count;
read_chunk(iof, buffer, 4096);
} while (sizeBefore < buffer->count);
/* Never return nil for :all */
return janet_wrap_buffer(buffer);
} else if (!janet_cstrcmp(sym, "line")) {
for (;;) {
int x = fgetc(iof->file);
if (x != EOF) janet_buffer_push_u8(buffer, (uint8_t)x);
if (x == EOF || x == '\n') break;
}
} else {
janet_panicf("expected one of :all, :line, got %v", argv[1]);
}
} else {
int32_t len = janet_getinteger(argv, 1);
if (len < 0) janet_panic("expected positive integer");
read_chunk(iof, buffer, len);
}
if (bufstart == buffer->count) return janet_wrap_nil();
return janet_wrap_buffer(buffer);
}
/* Write bytes to a file */
JANET_CORE_FN(cfun_io_fwrite,
"(file/write f bytes)",
"Writes to a file. 'bytes' must be string, buffer, or symbol. Returns the "
"file.") {
janet_arity(argc, 1, -1);
JanetFile *iof = janet_getabstract(argv, 0, &janet_file_type);
if (iof->flags & JANET_FILE_CLOSED)
janet_panic("file is closed");
if (!(iof->flags & (JANET_FILE_WRITE | JANET_FILE_APPEND | JANET_FILE_UPDATE)))
janet_panic("file is not writeable");
int32_t i;
/* Verify all arguments before writing to file */
for (i = 1; i < argc; i++)
janet_getbytes(argv, i);
for (i = 1; i < argc; i++) {
JanetByteView view = janet_getbytes(argv, i);
if (view.len) {
if (!fwrite(view.bytes, view.len, 1, iof->file)) {
janet_panic("error writing to file");
}
}
}
return argv[0];
}
/* Flush the bytes in the file */
JANET_CORE_FN(cfun_io_fflush,
"(file/flush f)",
"Flush any buffered bytes to the file system. In most files, writes are "
"buffered for efficiency reasons. Returns the file handle.") {
janet_fixarity(argc, 1);
JanetFile *iof = janet_getabstract(argv, 0, &janet_file_type);
if (iof->flags & JANET_FILE_CLOSED)
janet_panic("file is closed");
if (!(iof->flags & (JANET_FILE_WRITE | JANET_FILE_APPEND | JANET_FILE_UPDATE)))
janet_panic("file is not writeable");
if (fflush(iof->file))
janet_panic("could not flush file");
return argv[0];
}
#ifdef JANET_WINDOWS
#define WEXITSTATUS(x) x
#endif
/* For closing files from C API */
int janet_file_close(JanetFile *file) {
int ret = 0;
if (!(file->flags & (JANET_FILE_NOT_CLOSEABLE | JANET_FILE_CLOSED))) {
ret = fclose(file->file);
file->flags |= JANET_FILE_CLOSED;
return ret;
}
return 0;
}
/* Cleanup a file */
static int cfun_io_gc(void *p, size_t len) {
(void) len;
JanetFile *iof = (JanetFile *)p;
janet_file_close(iof);
return 0;
}
/* Close a file */
JANET_CORE_FN(cfun_io_fclose,
"(file/close f)",
"Close a file and release all related resources. When you are "
"done reading a file, close it to prevent a resource leak and let "
"other processes read the file.") {
janet_fixarity(argc, 1);
JanetFile *iof = janet_getabstract(argv, 0, &janet_file_type);
if (iof->flags & JANET_FILE_CLOSED)
return janet_wrap_nil();
if (iof->flags & (JANET_FILE_NOT_CLOSEABLE))
janet_panic("file not closable");
if (fclose(iof->file)) {
iof->flags |= JANET_FILE_NOT_CLOSEABLE;
janet_panic("could not close file");
}
iof->flags |= JANET_FILE_CLOSED;
return janet_wrap_nil();
}
/* Seek a file */
JANET_CORE_FN(cfun_io_fseek,
"(file/seek f &opt whence n)",
"Jump to a relative location in the file `f`. `whence` must be one of:\n\n"
"* :cur - jump relative to the current file location\n\n"
"* :set - jump relative to the beginning of the file\n\n"
"* :end - jump relative to the end of the file\n\n"
"By default, `whence` is :cur. Optionally a value `n` may be passed "
"for the relative number of bytes to seek in the file. `n` may be a real "
"number to handle large files of more than 4GB. Returns the file handle.") {
janet_arity(argc, 2, 3);
JanetFile *iof = janet_getabstract(argv, 0, &janet_file_type);
if (iof->flags & JANET_FILE_CLOSED)
janet_panic("file is closed");
long int offset = 0;
int whence = SEEK_CUR;
if (argc >= 2) {
const uint8_t *whence_sym = janet_getkeyword(argv, 1);
if (!janet_cstrcmp(whence_sym, "cur")) {
whence = SEEK_CUR;
} else if (!janet_cstrcmp(whence_sym, "set")) {
whence = SEEK_SET;
} else if (!janet_cstrcmp(whence_sym, "end")) {
whence = SEEK_END;
} else {
janet_panicf("expected one of :cur, :set, :end, got %v", argv[1]);
}
if (argc == 3) {
offset = (long) janet_getinteger64(argv, 2);
}
}
if (fseek(iof->file, offset, whence)) janet_panic("error seeking file");
return argv[0];
}
static JanetMethod io_file_methods[] = {
{"close", cfun_io_fclose},
{"flush", cfun_io_fflush},
{"read", cfun_io_fread},
{"seek", cfun_io_fseek},
{"write", cfun_io_fwrite},
{NULL, NULL}
};
static int io_file_get(void *p, Janet key, Janet *out) {
(void) p;
if (!janet_checktype(key, JANET_KEYWORD))
return 0;
return janet_getmethod(janet_unwrap_keyword(key), io_file_methods, out);
}
static Janet io_file_next(void *p, Janet key) {
(void) p;
return janet_nextmethod(io_file_methods, key);
}
static void io_file_marshal(void *p, JanetMarshalContext *ctx) {
JanetFile *iof = (JanetFile *)p;
if (ctx->flags & JANET_MARSHAL_UNSAFE) {
janet_marshal_abstract(ctx, p);
#ifdef JANET_WINDOWS
janet_marshal_int(ctx, _fileno(iof->file));
#else
janet_marshal_int(ctx, fileno(iof->file));
#endif
janet_marshal_int(ctx, iof->flags);
} else {
janet_panic("cannot marshal file in safe mode");
}
}
static void *io_file_unmarshal(JanetMarshalContext *ctx) {
if (ctx->flags & JANET_MARSHAL_UNSAFE) {
JanetFile *iof = janet_unmarshal_abstract(ctx, sizeof(JanetFile));
int32_t fd = janet_unmarshal_int(ctx);
int32_t flags = janet_unmarshal_int(ctx);
char fmt[4] = {0};
int index = 0;
if (flags & JANET_FILE_READ) fmt[index++] = 'r';
if (flags & JANET_FILE_APPEND) {
fmt[index++] = 'a';
} else if (flags & JANET_FILE_WRITE) {
fmt[index++] = 'w';
}
#ifdef JANET_WINDOWS
iof->file = _fdopen(fd, fmt);
#else
iof->file = fdopen(fd, fmt);
#endif
if (iof->file == NULL) {
iof->flags = JANET_FILE_CLOSED;
} else {
iof->flags = flags;
}
return iof;
} else {
janet_panic("cannot unmarshal file in safe mode");
}
}
FILE *janet_dynfile(const char *name, FILE *def) {
Janet x = janet_dyn(name);
if (!janet_checktype(x, JANET_ABSTRACT)) return def;
void *abstract = janet_unwrap_abstract(x);
if (janet_abstract_type(abstract) != &janet_file_type) return def;
JanetFile *iofile = abstract;
return iofile->file;
}
static Janet cfun_io_print_impl_x(int32_t argc, Janet *argv, int newline,
FILE *dflt_file, int32_t offset, Janet x) {
FILE *f;
switch (janet_type(x)) {
default:
janet_panicf("cannot print to %v", x);
case JANET_BUFFER: {
/* Special case buffer */
JanetBuffer *buf = janet_unwrap_buffer(x);
for (int32_t i = offset; i < argc; ++i) {
janet_to_string_b(buf, argv[i]);
}
if (newline)
janet_buffer_push_u8(buf, '\n');
return janet_wrap_nil();
}
case JANET_FUNCTION: {
/* Special case function */
JanetFunction *fun = janet_unwrap_function(x);
JanetBuffer *buf = janet_buffer(0);
for (int32_t i = offset; i < argc; ++i) {
janet_to_string_b(buf, argv[i]);
}
if (newline)
janet_buffer_push_u8(buf, '\n');
Janet args[1] = { janet_wrap_buffer(buf) };
janet_call(fun, 1, args);
return janet_wrap_nil();
}
case JANET_NIL:
f = dflt_file;
if (f == NULL) janet_panic("cannot print to nil");
break;
case JANET_ABSTRACT: {
void *abstract = janet_unwrap_abstract(x);
if (janet_abstract_type(abstract) != &janet_file_type)
return janet_wrap_nil();
JanetFile *iofile = abstract;
f = iofile->file;
break;
}
}
for (int32_t i = offset; i < argc; ++i) {
int32_t len;
const uint8_t *vstr;
if (janet_checktype(argv[i], JANET_BUFFER)) {
JanetBuffer *b = janet_unwrap_buffer(argv[i]);
vstr = b->data;
len = b->count;
} else {
vstr = janet_to_string(argv[i]);
len = janet_string_length(vstr);
}
if (len) {
if (1 != fwrite(vstr, len, 1, f)) {
if (f == dflt_file) {
janet_panicf("cannot print %d bytes", len);
} else {
janet_panicf("cannot print %d bytes to %v", len, x);
}
}
}
}
if (newline)
putc('\n', f);
return janet_wrap_nil();
}
static Janet cfun_io_print_impl(int32_t argc, Janet *argv,
int newline, const char *name, FILE *dflt_file) {
Janet x = janet_dyn(name);
return cfun_io_print_impl_x(argc, argv, newline, dflt_file, 0, x);
}
JANET_CORE_FN(cfun_io_print,
"(print & xs)",
"Print values to the console (standard out). Value are converted "
"to strings if they are not already. After printing all values, a "
"newline character is printed. Use the value of `(dyn :out stdout)` to determine "
"what to push characters to. Expects `(dyn :out stdout)` to be either a core/file or "
"a buffer. Returns nil.") {
return cfun_io_print_impl(argc, argv, 1, "out", stdout);
}
JANET_CORE_FN(cfun_io_prin,
"(prin & xs)",
"Same as `print`, but does not add trailing newline.") {
return cfun_io_print_impl(argc, argv, 0, "out", stdout);
}
JANET_CORE_FN(cfun_io_eprint,
"(eprint & xs)",
"Same as `print`, but uses `(dyn :err stderr)` instead of `(dyn :out stdout)`.") {
return cfun_io_print_impl(argc, argv, 1, "err", stderr);
}
JANET_CORE_FN(cfun_io_eprin,
"(eprin & xs)",
"Same as `prin`, but uses `(dyn :err stderr)` instead of `(dyn :out stdout)`.") {
return cfun_io_print_impl(argc, argv, 0, "err", stderr);
}
JANET_CORE_FN(cfun_io_xprint,
"(xprint to & xs)",
"Print to a file or other value explicitly (no dynamic bindings) with a trailing "
"newline character. The value to print "
"to is the first argument, and is otherwise the same as `print`. Returns nil.") {
janet_arity(argc, 1, -1);
return cfun_io_print_impl_x(argc, argv, 1, NULL, 1, argv[0]);
}
JANET_CORE_FN(cfun_io_xprin,
"(xprin to & xs)",
"Print to a file or other value explicitly (no dynamic bindings). The value to print "
"to is the first argument, and is otherwise the same as `prin`. Returns nil.") {
janet_arity(argc, 1, -1);
return cfun_io_print_impl_x(argc, argv, 0, NULL, 1, argv[0]);
}
static Janet cfun_io_printf_impl_x(int32_t argc, Janet *argv, int newline,
FILE *dflt_file, int32_t offset, Janet x) {
FILE *f;
const char *fmt = janet_getcstring(argv, offset);
switch (janet_type(x)) {
default:
janet_panicf("cannot print to %v", x);
case JANET_BUFFER: {
/* Special case buffer */
JanetBuffer *buf = janet_unwrap_buffer(x);
janet_buffer_format(buf, fmt, offset, argc, argv);
if (newline) janet_buffer_push_u8(buf, '\n');
return janet_wrap_nil();
}
case JANET_FUNCTION: {
/* Special case function */
JanetFunction *fun = janet_unwrap_function(x);
JanetBuffer *buf = janet_buffer(0);
janet_buffer_format(buf, fmt, offset, argc, argv);
if (newline) janet_buffer_push_u8(buf, '\n');
Janet args[1] = { janet_wrap_buffer(buf) };
janet_call(fun, 1, args);
return janet_wrap_nil();
}
case JANET_NIL:
f = dflt_file;
if (f == NULL) janet_panic("cannot print to nil");
break;
case JANET_ABSTRACT: {
void *abstract = janet_unwrap_abstract(x);
if (janet_abstract_type(abstract) != &janet_file_type)
return janet_wrap_nil();
JanetFile *iofile = abstract;
f = iofile->file;
break;
}
}
JanetBuffer *buf = janet_buffer(10);
janet_buffer_format(buf, fmt, offset, argc, argv);
if (newline) janet_buffer_push_u8(buf, '\n');
if (buf->count) {
if (1 != fwrite(buf->data, buf->count, 1, f)) {
janet_panicf("could not print %d bytes to file", buf->count);
}
}
/* Clear buffer to make things easier for GC */
buf->count = 0;
buf->capacity = 0;
janet_free(buf->data);
buf->data = NULL;
return janet_wrap_nil();
}
static Janet cfun_io_printf_impl(int32_t argc, Janet *argv, int newline,
const char *name, FILE *dflt_file) {
janet_arity(argc, 1, -1);
Janet x = janet_dyn(name);
return cfun_io_printf_impl_x(argc, argv, newline, dflt_file, 0, x);
}
JANET_CORE_FN(cfun_io_printf,
"(printf fmt & xs)",
"Prints output formatted as if with `(string/format fmt ;xs)` to `(dyn :out stdout)` with a trailing newline.") {
return cfun_io_printf_impl(argc, argv, 1, "out", stdout);
}
JANET_CORE_FN(cfun_io_prinf,
"(prinf fmt & xs)",
"Like `printf` but with no trailing newline.") {
return cfun_io_printf_impl(argc, argv, 0, "out", stdout);
}
JANET_CORE_FN(cfun_io_eprintf,
"(eprintf fmt & xs)",
"Prints output formatted as if with `(string/format fmt ;xs)` to `(dyn :err stderr)` with a trailing newline.") {
return cfun_io_printf_impl(argc, argv, 1, "err", stderr);
}
JANET_CORE_FN(cfun_io_eprinf,
"(eprinf fmt & xs)",
"Like `eprintf` but with no trailing newline.") {
return cfun_io_printf_impl(argc, argv, 0, "err", stderr);
}
JANET_CORE_FN(cfun_io_xprintf,
"(xprintf to fmt & xs)",
"Like `printf` but prints to an explicit file or value `to`. Returns nil.") {
janet_arity(argc, 2, -1);
return cfun_io_printf_impl_x(argc, argv, 1, NULL, 1, argv[0]);
}
JANET_CORE_FN(cfun_io_xprinf,
"(xprinf to fmt & xs)",
"Like `prinf` but prints to an explicit file or value `to`. Returns nil.") {
janet_arity(argc, 2, -1);
return cfun_io_printf_impl_x(argc, argv, 0, NULL, 1, argv[0]);
}
static void janet_flusher(const char *name, FILE *dflt_file) {
Janet x = janet_dyn(name);
switch (janet_type(x)) {
default:
break;
case JANET_NIL:
fflush(dflt_file);
break;
case JANET_ABSTRACT: {
void *abstract = janet_unwrap_abstract(x);
if (janet_abstract_type(abstract) != &janet_file_type) break;
JanetFile *iofile = abstract;
fflush(iofile->file);
break;
}
}
}
JANET_CORE_FN(cfun_io_flush,
"(flush)",
"Flush `(dyn :out stdout)` if it is a file, otherwise do nothing.") {
janet_fixarity(argc, 0);
(void) argv;
janet_flusher("out", stdout);
return janet_wrap_nil();
}
JANET_CORE_FN(cfun_io_eflush,
"(eflush)",
"Flush `(dyn :err stderr)` if it is a file, otherwise do nothing.") {
janet_fixarity(argc, 0);
(void) argv;
janet_flusher("err", stderr);
return janet_wrap_nil();
}
void janet_dynprintf(const char *name, FILE *dflt_file, const char *format, ...) {
va_list args;
va_start(args, format);
Janet x = janet_dyn(name);
JanetType xtype = janet_type(x);
switch (xtype) {
default:
/* Other values simply do nothing */
break;
case JANET_NIL:
case JANET_ABSTRACT: {
FILE *f = dflt_file;
JanetBuffer buffer;
int32_t len = 0;
while (format[len]) len++;
janet_buffer_init(&buffer, len);
janet_formatbv(&buffer, format, args);
if (xtype == JANET_ABSTRACT) {
void *abstract = janet_unwrap_abstract(x);
if (janet_abstract_type(abstract) != &janet_file_type)
break;
JanetFile *iofile = abstract;
f = iofile->file;
}
fwrite(buffer.data, buffer.count, 1, f);
janet_buffer_deinit(&buffer);
break;
}
case JANET_FUNCTION: {
JanetFunction *fun = janet_unwrap_function(x);
int32_t len = 0;
while (format[len]) len++;
JanetBuffer *buf = janet_buffer(len);
janet_formatbv(buf, format, args);
Janet args[1] = { janet_wrap_buffer(buf) };
janet_call(fun, 1, args);
break;
}
case JANET_BUFFER:
janet_formatbv(janet_unwrap_buffer(x), format, args);
break;
}
va_end(args);
return;
}
/* C API */
JanetFile *janet_getjfile(const Janet *argv, int32_t n) {
return janet_getabstract(argv, n, &janet_file_type);
}
FILE *janet_getfile(const Janet *argv, int32_t n, int *flags) {
JanetFile *iof = janet_getabstract(argv, n, &janet_file_type);
if (NULL != flags) *flags = iof->flags;
return iof->file;
}
JanetFile *janet_makejfile(FILE *f, int flags) {
return makef(f, flags);
}
Janet janet_makefile(FILE *f, int flags) {
return janet_wrap_abstract(makef(f, flags));
}
JanetAbstract janet_checkfile(Janet j) {
return janet_checkabstract(j, &janet_file_type);
}
FILE *janet_unwrapfile(Janet j, int *flags) {
JanetFile *iof = janet_unwrap_abstract(j);
if (NULL != flags) *flags = iof->flags;
return iof->file;
}
/* Module entry point */
void janet_lib_io(JanetTable *env) {
JanetRegExt io_cfuns[] = {
JANET_CORE_REG("print", cfun_io_print),
JANET_CORE_REG("prin", cfun_io_prin),
JANET_CORE_REG("printf", cfun_io_printf),
JANET_CORE_REG("prinf", cfun_io_prinf),
JANET_CORE_REG("eprin", cfun_io_eprin),
JANET_CORE_REG("eprint", cfun_io_eprint),
JANET_CORE_REG("eprintf", cfun_io_eprintf),
JANET_CORE_REG("eprinf", cfun_io_eprinf),
JANET_CORE_REG("xprint", cfun_io_xprint),
JANET_CORE_REG("xprin", cfun_io_xprin),
JANET_CORE_REG("xprintf", cfun_io_xprintf),
JANET_CORE_REG("xprinf", cfun_io_xprinf),
JANET_CORE_REG("flush", cfun_io_flush),
JANET_CORE_REG("eflush", cfun_io_eflush),
JANET_CORE_REG("file/temp", cfun_io_temp),
JANET_CORE_REG("file/open", cfun_io_fopen),
JANET_CORE_REG("file/close", cfun_io_fclose),
JANET_CORE_REG("file/read", cfun_io_fread),
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_REG_END
};
janet_core_cfuns_ext(env, NULL, io_cfuns);
janet_register_abstract_type(&janet_file_type);
int default_flags = JANET_FILE_NOT_CLOSEABLE | JANET_FILE_SERIALIZABLE;
/* stdout */
JANET_CORE_DEF(env, "stdout",
janet_makefile(stdout, JANET_FILE_APPEND | default_flags),
"The standard output file.");
/* stderr */
JANET_CORE_DEF(env, "stderr",
janet_makefile(stderr, JANET_FILE_APPEND | default_flags),
"The standard error file.");
/* stdin */
JANET_CORE_DEF(env, "stdin",
janet_makefile(stdin, JANET_FILE_READ | default_flags),
"The standard input file.");
}
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