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janet/src/core/buffer.c

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/*
* Copyright (c) 2023 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 "gc.h"
#include "util.h"
#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;
if (capacity < 4) capacity = 4;
janet_gcpressure(capacity);
data = janet_malloc(sizeof(uint8_t) * (size_t) capacity);
if (NULL == data) {
JANET_OUT_OF_MEMORY;
}
buffer->count = 0;
buffer->capacity = capacity;
buffer->data = data;
return buffer;
}
/* Initialize a buffer */
JanetBuffer *janet_buffer_init(JanetBuffer *buffer, int32_t capacity) {
janet_buffer_init_impl(buffer, capacity);
buffer->gc.data.next = NULL;
buffer->gc.flags = JANET_MEM_DISABLED;
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) {
if (!(buffer->gc.flags & JANET_BUFFER_FLAG_NO_REALLOC)) {
janet_free(buffer->data);
}
}
/* Initialize a buffer */
JanetBuffer *janet_buffer(int32_t capacity) {
JanetBuffer *buffer = janet_gcalloc(JANET_MEMORY_BUFFER, sizeof(JanetBuffer));
return janet_buffer_init_impl(buffer, capacity);
}
/* Ensure that the buffer has enough internal capacity */
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);
new_data = janet_realloc(old, (size_t) capacity * sizeof(uint8_t));
if (NULL == new_data) {
JANET_OUT_OF_MEMORY;
}
buffer->data = new_data;
buffer->capacity = capacity;
}
/* Ensure that the buffer has enough internal capacity */
void janet_buffer_setcount(JanetBuffer *buffer, int32_t count) {
if (count < 0)
return;
if (count > buffer->count) {
int32_t oldcount = buffer->count;
janet_buffer_ensure(buffer, count, 1);
memset(buffer->data + oldcount, 0, count - oldcount);
}
buffer->count = count;
}
/* Adds capacity for enough extra bytes to the buffer. Ensures that the
* next n bytes pushed to the buffer will not cause a reallocation */
void janet_buffer_extra(JanetBuffer *buffer, int32_t n) {
/* Check for buffer overflow */
if ((int64_t)n + buffer->count > INT32_MAX) {
janet_panic("buffer overflow");
}
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);
if (NULL == new_data) {
JANET_OUT_OF_MEMORY;
}
buffer->data = new_data;
buffer->capacity = new_capacity;
}
}
/* Push a cstring to buffer */
void janet_buffer_push_cstring(JanetBuffer *buffer, const char *cstring) {
int32_t len = (int32_t) strlen(cstring);
janet_buffer_push_bytes(buffer, (const uint8_t *) cstring, len);
}
/* Push multiple bytes into the buffer */
void janet_buffer_push_bytes(JanetBuffer *buffer, const uint8_t *string, int32_t length) {
if (0 == length) return;
janet_buffer_extra(buffer, length);
memcpy(buffer->data + buffer->count, string, length);
buffer->count += length;
}
void janet_buffer_push_string(JanetBuffer *buffer, const uint8_t *string) {
janet_buffer_push_bytes(buffer, string, janet_string_length(string));
}
/* Push a single byte to the buffer */
void janet_buffer_push_u8(JanetBuffer *buffer, uint8_t byte) {
janet_buffer_extra(buffer, 1);
buffer->data[buffer->count] = byte;
buffer->count++;
}
/* Push a 16 bit unsigned integer to the buffer */
void janet_buffer_push_u16(JanetBuffer *buffer, uint16_t x) {
janet_buffer_extra(buffer, 2);
buffer->data[buffer->count] = x & 0xFF;
buffer->data[buffer->count + 1] = (x >> 8) & 0xFF;
buffer->count += 2;
}
/* Push a 32 bit unsigned integer to the buffer */
void janet_buffer_push_u32(JanetBuffer *buffer, uint32_t x) {
janet_buffer_extra(buffer, 4);
buffer->data[buffer->count] = x & 0xFF;
buffer->data[buffer->count + 1] = (x >> 8) & 0xFF;
buffer->data[buffer->count + 2] = (x >> 16) & 0xFF;
buffer->data[buffer->count + 3] = (x >> 24) & 0xFF;
buffer->count += 4;
}
/* Push a 64 bit unsigned integer to the buffer */
void janet_buffer_push_u64(JanetBuffer *buffer, uint64_t x) {
janet_buffer_extra(buffer, 8);
buffer->data[buffer->count] = x & 0xFF;
buffer->data[buffer->count + 1] = (x >> 8) & 0xFF;
buffer->data[buffer->count + 2] = (x >> 16) & 0xFF;
buffer->data[buffer->count + 3] = (x >> 24) & 0xFF;
buffer->data[buffer->count + 4] = (x >> 32) & 0xFF;
buffer->data[buffer->count + 5] = (x >> 40) & 0xFF;
buffer->data[buffer->count + 6] = (x >> 48) & 0xFF;
buffer->data[buffer->count + 7] = (x >> 56) & 0xFF;
buffer->count += 8;
}
/* C functions */
JANET_CORE_FN(cfun_buffer_new,
"(buffer/new capacity)",
"Creates a new, empty buffer with enough backing memory for `capacity` bytes. "
"Returns a new buffer of length 0.") {
janet_fixarity(argc, 1);
int32_t cap = janet_getinteger(argv, 0);
JanetBuffer *buffer = janet_buffer(cap);
return janet_wrap_buffer(buffer);
}
JANET_CORE_FN(cfun_buffer_new_filled,
"(buffer/new-filled count &opt byte)",
"Creates a new buffer of length `count` filled with `byte`. By default, `byte` is 0. "
"Returns the new buffer.") {
janet_arity(argc, 1, 2);
int32_t count = janet_getinteger(argv, 0);
if (count < 0) count = 0;
int32_t byte = 0;
if (argc == 2) {
byte = janet_getinteger(argv, 1) & 0xFF;
}
JanetBuffer *buffer = janet_buffer(count);
if (buffer->data && count > 0)
memset(buffer->data, byte, count);
buffer->count = count;
return janet_wrap_buffer(buffer);
}
JANET_CORE_FN(cfun_buffer_frombytes,
"(buffer/from-bytes & byte-vals)",
"Creates a buffer from integer parameters with byte values. All integers "
"will be coerced to the range of 1 byte 0-255.") {
int32_t i;
JanetBuffer *buffer = janet_buffer(argc);
for (i = 0; i < argc; i++) {
int32_t c = janet_getinteger(argv, i);
buffer->data[i] = c & 0xFF;
}
buffer->count = argc;
return janet_wrap_buffer(buffer);
}
JANET_CORE_FN(cfun_buffer_fill,
"(buffer/fill buffer &opt byte)",
"Fill up a buffer with bytes, defaulting to 0s. Does not change the buffer's length. "
"Returns the modified buffer.") {
janet_arity(argc, 1, 2);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
int32_t byte = 0;
if (argc == 2) {
byte = janet_getinteger(argv, 1) & 0xFF;
}
if (buffer->count) {
memset(buffer->data, byte, buffer->count);
}
return argv[0];
}
JANET_CORE_FN(cfun_buffer_trim,
"(buffer/trim buffer)",
"Set the backing capacity of the buffer to the current length of the buffer. Returns the "
"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);
if (NULL == newData) {
JANET_OUT_OF_MEMORY;
}
buffer->data = newData;
buffer->capacity = newcap;
}
return argv[0];
}
JANET_CORE_FN(cfun_buffer_u8,
"(buffer/push-byte buffer & xs)",
"Append bytes to a buffer. Will expand the buffer as necessary. "
"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++) {
janet_buffer_push_u8(buffer, (uint8_t)(janet_getinteger(argv, i) & 0xFF));
}
return argv[0];
}
JANET_CORE_FN(cfun_buffer_word,
"(buffer/push-word buffer & xs)",
"Append machine words to a buffer. The 4 bytes of the integer are appended "
"in twos complement, little endian order, unsigned for all x. 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++) {
double number = janet_getnumber(argv, i);
uint32_t word = (uint32_t) number;
if (word != number)
janet_panicf("cannot convert %v to machine word", argv[i]);
janet_buffer_push_u32(buffer, word);
}
return argv[0];
}
JANET_CORE_FN(cfun_buffer_chars,
"(buffer/push-string buffer & xs)",
"Push byte sequences onto the end of a buffer. "
"Will accept any of strings, keywords, symbols, and buffers. "
"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++) {
JanetByteView view = janet_getbytes(argv, i);
if (view.bytes == buffer->data) {
janet_buffer_ensure(buffer, buffer->count + view.len, 2);
view.bytes = buffer->data;
}
janet_buffer_push_bytes(buffer, view.bytes, view.len);
}
return argv[0];
}
static int should_reverse_bytes(const Janet *argv, int32_t argc) {
JanetKeyword order_kw = janet_getkeyword(argv, argc);
if (!janet_cstrcmp(order_kw, "le")) {
#if JANET_BIG_ENDIAN
return 1;
#endif
} else if (!janet_cstrcmp(order_kw, "be")) {
#if JANET_LITTLE_ENDIAN
return 1;
#endif
} else if (!janet_cstrcmp(order_kw, "native")) {
return 0;
} else {
janet_panicf("expected endianness :le, :be or :native, got %v", argv[1]);
}
return 0;
}
static void reverse_u32(uint8_t bytes[4]) {
uint8_t temp;
temp = bytes[3];
bytes[3] = bytes[0];
bytes[0] = temp;
temp = bytes[2];
bytes[2] = bytes[1];
bytes[1] = temp;
}
static void reverse_u64(uint8_t bytes[8]) {
uint8_t temp;
temp = bytes[7];
bytes[7] = bytes[0];
bytes[0] = temp;
temp = bytes[6];
bytes[6] = bytes[1];
bytes[1] = temp;
temp = bytes[5];
bytes[5] = bytes[2];
bytes[2] = temp;
temp = bytes[4];
bytes[4] = bytes[3];
bytes[3] = temp;
}
JANET_CORE_FN(cfun_buffer_push_uint16,
"(buffer/push-uint16 buffer order data)",
"Push a 16 bit unsigned integer data onto the end of the buffer. "
"Returns the modified buffer.") {
janet_fixarity(argc, 3);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
int reverse = should_reverse_bytes(argv, 1);
union {
uint16_t data;
uint8_t bytes[2];
} u;
u.data = (uint16_t) janet_getinteger(argv, 2);
if (reverse) {
uint8_t temp = u.bytes[1];
u.bytes[1] = u.bytes[0];
u.bytes[0] = temp;
}
janet_buffer_push_u16(buffer, *(uint16_t *) u.bytes);
return argv[0];
}
JANET_CORE_FN(cfun_buffer_push_uint32,
"(buffer/push-uint32 buffer order data)",
"Push a 32 bit unsigned integer data onto the end of the buffer. "
"Returns the modified buffer.") {
janet_fixarity(argc, 3);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
int reverse = should_reverse_bytes(argv, 1);
union {
uint32_t data;
uint8_t bytes[4];
} u;
u.data = (uint32_t) janet_getinteger(argv, 2);
if (reverse)
reverse_u32(u.bytes);
janet_buffer_push_u32(buffer, *(uint32_t *) u.bytes);
return argv[0];
}
JANET_CORE_FN(cfun_buffer_push_uint64,
"(buffer/push-uint64 buffer order data)",
"Push a 64 bit unsigned integer data onto the end of the buffer. "
"Returns the modified buffer.") {
janet_fixarity(argc, 3);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
int reverse = should_reverse_bytes(argv, 1);
union {
uint64_t data;
uint8_t bytes[8];
} u;
u.data = (uint64_t) janet_getuinteger64(argv, 2);
if (reverse)
reverse_u64(u.bytes);
janet_buffer_push_u64(buffer, *(uint64_t *) u.bytes);
return argv[0];
}
JANET_CORE_FN(cfun_buffer_push_float32,
"(buffer/push-float32 buffer order data)",
"Push the underlying bytes of a 32 bit float data onto the end of the buffer. "
"Returns the modified buffer.") {
janet_fixarity(argc, 3);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
int reverse = should_reverse_bytes(argv, 1);
union {
float data;
uint8_t bytes[4];
} u;
u.data = (float) janet_getnumber(argv, 2);
if (reverse)
reverse_u32(u.bytes);
janet_buffer_push_u32(buffer, *(uint32_t *) u.bytes);
return argv[0];
}
JANET_CORE_FN(cfun_buffer_push_float64,
"(buffer/push-float64 buffer order data)",
"Push the underlying bytes of a 64 bit float data onto the end of the buffer. "
"Returns the modified buffer.") {
janet_fixarity(argc, 3);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
int reverse = should_reverse_bytes(argv, 1);
union {
double data;
uint8_t bytes[8];
} u;
u.data = janet_getnumber(argv, 2);
if (reverse)
reverse_u64(u.bytes);
janet_buffer_push_u64(buffer, *(uint64_t *) u.bytes);
return argv[0];
}
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 {
JanetByteView view = janet_getbytes(argv, i);
if (view.bytes == buffer->data) {
janet_buffer_ensure(buffer, buffer->count + view.len, 2);
view.bytes = buffer->data;
}
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 copies the new data into the buffer "
" 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];
}
JANET_CORE_FN(cfun_buffer_clear,
"(buffer/clear buffer)",
"Sets the size of a buffer to 0 and empties it. The buffer retains "
"its memory so it can be efficiently refilled. Returns the modified buffer.") {
janet_fixarity(argc, 1);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
buffer->count = 0;
return argv[0];
}
JANET_CORE_FN(cfun_buffer_popn,
"(buffer/popn buffer n)",
"Removes the last `n` bytes from the buffer. Returns the modified buffer.") {
janet_fixarity(argc, 2);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
int32_t n = janet_getinteger(argv, 1);
if (n < 0) janet_panic("n must be non-negative");
if (buffer->count < n) {
buffer->count = 0;
} else {
buffer->count -= n;
}
return argv[0];
}
JANET_CORE_FN(cfun_buffer_slice,
"(buffer/slice bytes &opt start end)",
"Takes a slice of a byte sequence from `start` to `end`. The range is half open, "
"[start, end). Indexes can also be negative, indicating indexing from the end of the "
"end of the array. By default, `start` is 0 and `end` is the length of the buffer. "
"Returns a new buffer.") {
JanetByteView view = janet_getbytes(argv, 0);
JanetRange range = janet_getslice(argc, argv);
JanetBuffer *buffer = janet_buffer(range.end - range.start);
if (buffer->data)
memcpy(buffer->data, view.bytes + range.start, range.end - range.start);
buffer->count = range.end - range.start;
return janet_wrap_buffer(buffer);
}
static void bitloc(int32_t argc, Janet *argv, JanetBuffer **b, int32_t *index, int *bit) {
janet_fixarity(argc, 2);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
double x = janet_getnumber(argv, 1);
int64_t bitindex = (int64_t) x;
int64_t byteindex = bitindex >> 3;
int which_bit = bitindex & 7;
if (bitindex != x || bitindex < 0 || byteindex >= buffer->count)
janet_panicf("invalid bit index %v", argv[1]);
*b = buffer;
*index = (int32_t) byteindex;
*bit = which_bit;
}
JANET_CORE_FN(cfun_buffer_bitset,
"(buffer/bit-set buffer index)",
"Sets the bit at the given bit-index. Returns the buffer.") {
int bit;
int32_t index;
JanetBuffer *buffer;
bitloc(argc, argv, &buffer, &index, &bit);
buffer->data[index] |= 1 << bit;
return argv[0];
}
JANET_CORE_FN(cfun_buffer_bitclear,
"(buffer/bit-clear buffer index)",
"Clears the bit at the given bit-index. Returns the buffer.") {
int bit;
int32_t index;
JanetBuffer *buffer;
bitloc(argc, argv, &buffer, &index, &bit);
buffer->data[index] &= ~(1 << bit);
return argv[0];
}
JANET_CORE_FN(cfun_buffer_bitget,
"(buffer/bit buffer index)",
"Gets the bit at the given bit-index. Returns true if the bit is set, false if not.") {
int bit;
int32_t index;
JanetBuffer *buffer;
bitloc(argc, argv, &buffer, &index, &bit);
return janet_wrap_boolean(buffer->data[index] & (1 << bit));
}
JANET_CORE_FN(cfun_buffer_bittoggle,
"(buffer/bit-toggle buffer index)",
"Toggles the bit at the given bit index in buffer. Returns the buffer.") {
int bit;
int32_t index;
JanetBuffer *buffer;
bitloc(argc, argv, &buffer, &index, &bit);
buffer->data[index] ^= (1 << bit);
return argv[0];
}
JANET_CORE_FN(cfun_buffer_blit,
"(buffer/blit dest src &opt dest-start src-start src-end)",
"Insert the contents of `src` into `dest`. Can optionally take indices that "
"indicate which part of `src` to copy into which part of `dest`. Indices can be "
"negative in order to index from the end of `src` or `dest`. Returns `dest`.") {
janet_arity(argc, 2, 5);
JanetBuffer *dest = janet_getbuffer(argv, 0);
JanetByteView src = janet_getbytes(argv, 1);
int same_buf = src.bytes == dest->data;
int32_t offset_dest = 0;
int32_t offset_src = 0;
if (argc > 2 && !janet_checktype(argv[2], JANET_NIL))
offset_dest = janet_gethalfrange(argv, 2, dest->count, "dest-start");
if (argc > 3 && !janet_checktype(argv[3], JANET_NIL))
offset_src = janet_gethalfrange(argv, 3, src.len, "src-start");
int32_t length_src;
if (argc > 4) {
int32_t src_end = src.len;
if (!janet_checktype(argv[4], JANET_NIL))
src_end = janet_gethalfrange(argv, 4, src.len, "src-end");
length_src = src_end - offset_src;
if (length_src < 0) length_src = 0;
} else {
length_src = src.len - offset_src;
}
int64_t last = (int64_t) offset_dest + length_src;
if (last > INT32_MAX)
janet_panic("buffer blit out of range");
int32_t last32 = (int32_t) last;
janet_buffer_ensure(dest, last32, 2);
if (last32 > dest->count) dest->count = last32;
if (length_src) {
if (same_buf) {
/* janet_buffer_ensure may have invalidated src */
src.bytes = dest->data;
memmove(dest->data + offset_dest, src.bytes + offset_src, length_src);
} else {
memcpy(dest->data + offset_dest, src.bytes + offset_src, length_src);
}
}
return argv[0];
}
JANET_CORE_FN(cfun_buffer_format,
"(buffer/format buffer format & args)",
"Snprintf like functionality for printing values into a buffer. Returns "
"the modified buffer.") {
janet_arity(argc, 2, -1);
JanetBuffer *buffer = janet_getbuffer(argv, 0);
const char *strfrmt = (const char *) janet_getstring(argv, 1);
janet_buffer_format(buffer, strfrmt, 1, argc, argv);
return argv[0];
}
void janet_lib_buffer(JanetTable *env) {
JanetRegExt buffer_cfuns[] = {
JANET_CORE_REG("buffer/new", cfun_buffer_new),
JANET_CORE_REG("buffer/new-filled", cfun_buffer_new_filled),
JANET_CORE_REG("buffer/from-bytes", cfun_buffer_frombytes),
JANET_CORE_REG("buffer/fill", cfun_buffer_fill),
JANET_CORE_REG("buffer/trim", cfun_buffer_trim),
JANET_CORE_REG("buffer/push-byte", cfun_buffer_u8),
JANET_CORE_REG("buffer/push-word", cfun_buffer_word),
JANET_CORE_REG("buffer/push-string", cfun_buffer_chars),
JANET_CORE_REG("buffer/push-uint16", cfun_buffer_push_uint16),
JANET_CORE_REG("buffer/push-uint32", cfun_buffer_push_uint32),
JANET_CORE_REG("buffer/push-uint64", cfun_buffer_push_uint64),
JANET_CORE_REG("buffer/push-float32", cfun_buffer_push_float32),
JANET_CORE_REG("buffer/push-float64", cfun_buffer_push_float64),
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),
JANET_CORE_REG("buffer/bit-set", cfun_buffer_bitset),
JANET_CORE_REG("buffer/bit-clear", cfun_buffer_bitclear),
JANET_CORE_REG("buffer/bit", cfun_buffer_bitget),
JANET_CORE_REG("buffer/bit-toggle", cfun_buffer_bittoggle),
JANET_CORE_REG("buffer/blit", cfun_buffer_blit),
JANET_CORE_REG("buffer/format", cfun_buffer_format),
JANET_REG_END
};
janet_core_cfuns_ext(env, NULL, buffer_cfuns);
}
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