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quickjs/cutils.c
Charlie Gordon 921c1eef50
Simpler utf8_decode (#414) 
- no longer pass the array length to `utf8_decode`
- add `utf8_decode_len` for border cases
- use switch based dispatch in `utf8_decode_len` to work around a gcc 12.2 optimizer bug
2024-05-27 08:15:52 +02:00

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/*
* C utilities
*
* Copyright (c) 2017 Fabrice Bellard
* Copyright (c) 2018 Charlie Gordon
*
* 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.
*/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#if !defined(_MSC_VER)
#include <sys/time.h>
#endif
#include "cutils.h"
#undef NANOSEC
#define NANOSEC ((uint64_t) 1e9)
#pragma GCC visibility push(default)
void pstrcpy(char *buf, int buf_size, const char *str)
{
int c;
char *q = buf;
if (buf_size <= 0)
return;
for(;;) {
c = *str++;
if (c == 0 || q >= buf + buf_size - 1)
break;
*q++ = c;
}
*q = '\0';
}
/* strcat and truncate. */
char *pstrcat(char *buf, int buf_size, const char *s)
{
int len;
len = strlen(buf);
if (len < buf_size)
pstrcpy(buf + len, buf_size - len, s);
return buf;
}
int strstart(const char *str, const char *val, const char **ptr)
{
const char *p, *q;
p = str;
q = val;
while (*q != '\0') {
if (*p != *q)
return 0;
p++;
q++;
}
if (ptr)
*ptr = p;
return 1;
}
int has_suffix(const char *str, const char *suffix)
{
size_t len = strlen(str);
size_t slen = strlen(suffix);
return (len >= slen && !memcmp(str + len - slen, suffix, slen));
}
/* Dynamic buffer package */
static void *dbuf_default_realloc(void *opaque, void *ptr, size_t size)
{
return realloc(ptr, size);
}
void dbuf_init2(DynBuf *s, void *opaque, DynBufReallocFunc *realloc_func)
{
memset(s, 0, sizeof(*s));
if (!realloc_func)
realloc_func = dbuf_default_realloc;
s->opaque = opaque;
s->realloc_func = realloc_func;
}
void dbuf_init(DynBuf *s)
{
dbuf_init2(s, NULL, NULL);
}
/* return < 0 if error */
int dbuf_realloc(DynBuf *s, size_t new_size)
{
size_t size;
uint8_t *new_buf;
if (new_size > s->allocated_size) {
if (s->error)
return -1;
size = s->allocated_size * 3 / 2;
if (size > new_size)
new_size = size;
new_buf = s->realloc_func(s->opaque, s->buf, new_size);
if (!new_buf) {
s->error = TRUE;
return -1;
}
s->buf = new_buf;
s->allocated_size = new_size;
}
return 0;
}
int dbuf_write(DynBuf *s, size_t offset, const void *data, size_t len)
{
size_t end;
end = offset + len;
if (dbuf_realloc(s, end))
return -1;
memcpy(s->buf + offset, data, len);
if (end > s->size)
s->size = end;
return 0;
}
int dbuf_put(DynBuf *s, const void *data, size_t len)
{
if (unlikely((s->size + len) > s->allocated_size)) {
if (dbuf_realloc(s, s->size + len))
return -1;
}
if (len > 0) {
memcpy(s->buf + s->size, data, len);
s->size += len;
}
return 0;
}
int dbuf_put_self(DynBuf *s, size_t offset, size_t len)
{
if (unlikely((s->size + len) > s->allocated_size)) {
if (dbuf_realloc(s, s->size + len))
return -1;
}
memcpy(s->buf + s->size, s->buf + offset, len);
s->size += len;
return 0;
}
int dbuf_putc(DynBuf *s, uint8_t c)
{
return dbuf_put(s, &c, 1);
}
int dbuf_putstr(DynBuf *s, const char *str)
{
return dbuf_put(s, (const uint8_t *)str, strlen(str));
}
int __attribute__((format(printf, 2, 3))) dbuf_printf(DynBuf *s,
const char *fmt, ...)
{
va_list ap;
char buf[128];
int len;
va_start(ap, fmt);
len = vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if (len < sizeof(buf)) {
/* fast case */
return dbuf_put(s, (uint8_t *)buf, len);
} else {
if (dbuf_realloc(s, s->size + len + 1))
return -1;
va_start(ap, fmt);
vsnprintf((char *)(s->buf + s->size), s->allocated_size - s->size,
fmt, ap);
va_end(ap);
s->size += len;
}
return 0;
}
void dbuf_free(DynBuf *s)
{
/* we test s->buf as a fail safe to avoid crashing if dbuf_free()
is called twice */
if (s->buf) {
s->realloc_func(s->opaque, s->buf, 0);
}
memset(s, 0, sizeof(*s));
}
/*--- UTF-8 utility functions --*/
/* Note: only encode valid codepoints (0x0000..0x10FFFF).
At most UTF8_CHAR_LEN_MAX bytes are output. */
/* Compute the number of bytes of the UTF-8 encoding for a codepoint
`c` is a code-point.
Returns the number of bytes. If a codepoint is beyond 0x10FFFF the
return value is 3 as the codepoint would be encoded as 0xFFFD.
*/
size_t utf8_encode_len(uint32_t c)
{
if (c < 0x80)
return 1;
if (c < 0x800)
return 2;
if (c < 0x10000)
return 3;
if (c < 0x110000)
return 4;
return 3;
}
/* Encode a codepoint in UTF-8
`buf` points to an array of at least `UTF8_CHAR_LEN_MAX` bytes
`c` is a code-point.
Returns the number of bytes. If a codepoint is beyond 0x10FFFF the
return value is 3 and the codepoint is encoded as 0xFFFD.
No null byte is stored after the encoded bytes.
Return value is in range 1..4
*/
size_t utf8_encode(uint8_t *buf, uint32_t c)
{
if (c < 0x80) {
buf[0] = c;
return 1;
}
if (c < 0x800) {
buf[0] = (c >> 6) | 0xC0;
buf[1] = (c & 0x3F) | 0x80;
return 2;
}
if (c < 0x10000) {
buf[0] = (c >> 12) | 0xE0;
buf[1] = ((c >> 6) & 0x3F) | 0x80;
buf[2] = (c & 0x3F) | 0x80;
return 3;
}
if (c < 0x110000) {
buf[0] = (c >> 18) | 0xF0;
buf[1] = ((c >> 12) & 0x3F) | 0x80;
buf[2] = ((c >> 6) & 0x3F) | 0x80;
buf[3] = (c & 0x3F) | 0x80;
return 4;
}
buf[0] = (0xFFFD >> 12) | 0xE0;
buf[1] = ((0xFFFD >> 6) & 0x3F) | 0x80;
buf[2] = (0xFFFD & 0x3F) | 0x80;
return 3;
}
/* Decode a single code point from a UTF-8 encoded array of bytes
`p` is a valid pointer to an array of bytes
`pp` is a valid pointer to a `const uint8_t *` to store a pointer
to the byte following the current sequence.
Return the code point at `p`, in the range `0..0x10FFFF`
Return 0xFFFD on error. Only a single byte is consumed in this case
The maximum length for a UTF-8 byte sequence is 4 bytes.
This implements the algorithm specified in whatwg.org, except it accepts
UTF-8 encoded surrogates as JavaScript allows them in strings.
The source string is assumed to have at least UTF8_CHAR_LEN_MAX bytes
or be null terminated.
If `p[0]` is '\0', the return value is `0` and the byte is consumed.
cf: https://encoding.spec.whatwg.org/#utf-8-encoder
*/
uint32_t utf8_decode(const uint8_t *p, const uint8_t **pp)
{
uint32_t c;
uint8_t lower, upper;
c = *p++;
if (c < 0x80) {
*pp = p;
return c;
}
switch(c) {
case 0xC2: case 0xC3:
case 0xC4: case 0xC5: case 0xC6: case 0xC7:
case 0xC8: case 0xC9: case 0xCA: case 0xCB:
case 0xCC: case 0xCD: case 0xCE: case 0xCF:
case 0xD0: case 0xD1: case 0xD2: case 0xD3:
case 0xD4: case 0xD5: case 0xD6: case 0xD7:
case 0xD8: case 0xD9: case 0xDA: case 0xDB:
case 0xDC: case 0xDD: case 0xDE: case 0xDF:
if (*p >= 0x80 && *p <= 0xBF) {
*pp = p + 1;
return ((c - 0xC0) << 6) + (*p - 0x80);
}
// otherwise encoding error
break;
case 0xE0:
lower = 0xA0; /* reject invalid encoding */
goto need2;
case 0xE1: case 0xE2: case 0xE3:
case 0xE4: case 0xE5: case 0xE6: case 0xE7:
case 0xE8: case 0xE9: case 0xEA: case 0xEB:
case 0xEC: case 0xED: case 0xEE: case 0xEF:
lower = 0x80;
need2:
if (*p >= lower && *p <= 0xBF && p[1] >= 0x80 && p[1] <= 0xBF) {
*pp = p + 2;
return ((c - 0xE0) << 12) + ((*p - 0x80) << 6) + (p[1] - 0x80);
}
// otherwise encoding error
break;
case 0xF0:
lower = 0x90; /* reject invalid encoding */
upper = 0xBF;
goto need3;
case 0xF4:
lower = 0x80;
upper = 0x8F; /* reject values above 0x10FFFF */
goto need3;
case 0xF1: case 0xF2: case 0xF3:
lower = 0x80;
upper = 0xBF;
need3:
if (*p >= lower && *p <= upper && p[1] >= 0x80 && p[1] <= 0xBF
&& p[2] >= 0x80 && p[2] <= 0xBF) {
*pp = p + 3;
return ((c - 0xF0) << 18) + ((*p - 0x80) << 12) +
((p[1] - 0x80) << 6) + (p[2] - 0x80);
}
// otherwise encoding error
break;
default:
// invalid lead byte
break;
}
*pp = p;
return 0xFFFD;
}
uint32_t utf8_decode_len(const uint8_t *p, size_t max_len, const uint8_t **pp) {
switch (max_len) {
case 0:
*pp = p;
return 0xFFFD;
case 1:
if (*p < 0x80)
goto good;
break;
case 2:
if (*p < 0xE0)
goto good;
break;
case 3:
if (*p < 0xF0)
goto good;
break;
default:
good:
return utf8_decode(p, pp);
}
*pp = p + 1;
return 0xFFFD;
}
/* Scan a UTF-8 encoded buffer for content type
`buf` is a valid pointer to a UTF-8 encoded string
`len` is the number of bytes to scan
`plen` points to a `size_t` variable to receive the number of units
Return value is a mask of bits.
- `UTF8_PLAIN_ASCII`: return value for 7-bit ASCII plain text
- `UTF8_NON_ASCII`: bit for non ASCII code points (8-bit or more)
- `UTF8_HAS_16BIT`: bit for 16-bit code points
- `UTF8_HAS_NON_BMP1`: bit for non-BMP1 code points, needs UTF-16 surrogate pairs
- `UTF8_HAS_ERRORS`: bit for encoding errors
*/
int utf8_scan(const char *buf, size_t buf_len, size_t *plen)
{
const uint8_t *p, *p_end, *p_next;
size_t i, len;
int kind;
uint8_t cbits;
kind = UTF8_PLAIN_ASCII;
cbits = 0;
len = buf_len;
// TODO: handle more than 1 byte at a time
for (i = 0; i < buf_len; i++)
cbits |= buf[i];
if (cbits >= 0x80) {
p = (const uint8_t *)buf;
p_end = p + buf_len;
kind = UTF8_NON_ASCII;
len = 0;
while (p < p_end) {
len++;
if (*p++ >= 0x80) {
/* parse UTF-8 sequence, check for encoding error */
uint32_t c = utf8_decode_len(p - 1, p_end - (p - 1), &p_next);
if (p_next == p)
kind |= UTF8_HAS_ERRORS;
p = p_next;
if (c > 0xFF) {
kind |= UTF8_HAS_16BIT;
if (c > 0xFFFF) {
len++;
kind |= UTF8_HAS_NON_BMP1;
}
}
}
}
}
*plen = len;
return kind;
}
/* Decode a string encoded in UTF-8 into an array of bytes
`src` points to the source string. It is assumed to be correctly encoded
and only contains code points below 0x800
`src_len` is the length of the source string
`dest` points to the destination array, it can be null if `dest_len` is `0`
`dest_len` is the length of the destination array. A null
terminator is stored at the end of the array unless `dest_len` is `0`.
*/
size_t utf8_decode_buf8(uint8_t *dest, size_t dest_len, const char *src, size_t src_len)
{
const uint8_t *p, *p_end;
size_t i;
p = (const uint8_t *)src;
p_end = p + src_len;
for (i = 0; p < p_end; i++) {
uint32_t c = *p++;
if (c >= 0xC0)
c = (c << 6) + *p++ - ((0xC0 << 6) + 0x80);
if (i < dest_len)
dest[i] = c;
}
if (i < dest_len)
dest[i] = '\0';
else if (dest_len > 0)
dest[dest_len - 1] = '\0';
return i;
}
/* Decode a string encoded in UTF-8 into an array of 16-bit words
`src` points to the source string. It is assumed to be correctly encoded.
`src_len` is the length of the source string
`dest` points to the destination array, it can be null if `dest_len` is `0`
`dest_len` is the length of the destination array. No null terminator is
stored at the end of the array.
*/
size_t utf8_decode_buf16(uint16_t *dest, size_t dest_len, const char *src, size_t src_len)
{
const uint8_t *p, *p_end;
size_t i;
p = (const uint8_t *)src;
p_end = p + src_len;
for (i = 0; p < p_end; i++) {
uint32_t c = *p++;
if (c >= 0x80) {
/* parse utf-8 sequence */
c = utf8_decode_len(p - 1, p_end - (p - 1), &p);
/* encoding errors are converted as 0xFFFD and use a single byte */
if (c > 0xFFFF) {
if (i < dest_len)
dest[i] = get_hi_surrogate(c);
i++;
c = get_lo_surrogate(c);
}
}
if (i < dest_len)
dest[i] = c;
}
return i;
}
/* Encode a buffer of 8-bit bytes as a UTF-8 encoded string
`src` points to the source buffer.
`src_len` is the length of the source buffer
`dest` points to the destination array, it can be null if `dest_len` is `0`
`dest_len` is the length in bytes of the destination array. A null
terminator is stored at the end of the array unless `dest_len` is `0`.
*/
size_t utf8_encode_buf8(char *dest, size_t dest_len, const uint8_t *src, size_t src_len)
{
size_t i, j;
uint32_t c;
for (i = j = 0; i < src_len; i++) {
c = src[i];
if (c < 0x80) {
if (j + 1 >= dest_len)
goto overflow;
dest[j++] = c;
} else {
if (j + 2 >= dest_len)
goto overflow;
dest[j++] = (c >> 6) | 0xC0;
dest[j++] = (c & 0x3F) | 0x80;
}
}
if (j < dest_len)
dest[j] = '\0';
return j;
overflow:
if (j < dest_len)
dest[j] = '\0';
while (i < src_len)
j += 1 + (src[i++] >= 0x80);
return j;
}
/* Encode a buffer of 16-bit code points as a UTF-8 encoded string
`src` points to the source buffer.
`src_len` is the length of the source buffer
`dest` points to the destination array, it can be null if `dest_len` is `0`
`dest_len` is the length in bytes of the destination array. A null
terminator is stored at the end of the array unless `dest_len` is `0`.
*/
size_t utf8_encode_buf16(char *dest, size_t dest_len, const uint16_t *src, size_t src_len)
{
size_t i, j;
uint32_t c;
for (i = j = 0; i < src_len;) {
c = src[i++];
if (c < 0x80) {
if (j + 1 >= dest_len)
goto overflow;
dest[j++] = c;
} else {
if (is_hi_surrogate(c) && i < src_len && is_lo_surrogate(src[i]))
c = from_surrogate(c, src[i++]);
if (j + utf8_encode_len(c) >= dest_len)
goto overflow;
j += utf8_encode((uint8_t *)dest + j, c);
}
}
if (j < dest_len)
dest[j] = '\0';
return j;
overflow:
i -= 1 + (c > 0xFFFF);
if (j < dest_len)
dest[j] = '\0';
while (i < src_len) {
c = src[i++];
if (c < 0x80) {
j++;
} else {
if (is_hi_surrogate(c) && i < src_len && is_lo_surrogate(src[i]))
c = from_surrogate(c, src[i++]);
j += utf8_encode_len(c);
}
}
return j;
}
/*--- integer to string conversions --*/
/* All conversion functions:
- require a destination array `buf` of sufficient length
- write the string representation at the beginning of `buf`
- null terminate the string
- return the string length
*/
/* 2 <= base <= 36 */
char const digits36[36] = "0123456789abcdefghijklmnopqrstuvwxyz";
#define USE_SPECIAL_RADIX_10 1 // special case base 10 radix conversions
#define USE_SINGLE_CASE_FAST 1 // special case single digit numbers
/* using u32toa_shift variant */
#define gen_digit(buf, c) if (is_be()) \
buf = (buf >> 8) | ((uint64_t)(c) << ((sizeof(buf) - 1) * 8)); \
else \
buf = (buf << 8) | (c)
size_t u7toa_shift(char dest[minimum_length(8)], uint32_t n)
{
size_t len = 1;
uint64_t buf = 0;
while (n >= 10) {
uint32_t quo = n % 10;
n /= 10;
gen_digit(buf, '0' + quo);
len++;
}
gen_digit(buf, '0' + n);
memcpy(dest, &buf, sizeof buf);
return len;
}
size_t u07toa_shift(char dest[minimum_length(8)], uint32_t n, size_t len)
{
size_t i;
dest += len;
dest[7] = '\0';
for (i = 7; i-- > 1;) {
uint32_t quo = n % 10;
n /= 10;
dest[i] = (char)('0' + quo);
}
dest[i] = (char)('0' + n);
return len + 7;
}
size_t u32toa(char buf[minimum_length(11)], uint32_t n)
{
#ifdef USE_SINGLE_CASE_FAST /* 10% */
if (n < 10) {
buf[0] = (char)('0' + n);
buf[1] = '\0';
return 1;
}
#endif
#define TEN_POW_7 10000000
if (n >= TEN_POW_7) {
uint32_t quo = n / TEN_POW_7;
n %= TEN_POW_7;
size_t len = u7toa_shift(buf, quo);
return u07toa_shift(buf, n, len);
}
return u7toa_shift(buf, n);
}
size_t u64toa(char buf[minimum_length(21)], uint64_t n)
{
if (likely(n < 0x100000000))
return u32toa(buf, n);
size_t len;
if (n >= TEN_POW_7) {
uint64_t n1 = n / TEN_POW_7;
n %= TEN_POW_7;
if (n1 >= TEN_POW_7) {
uint32_t quo = n1 / TEN_POW_7;
n1 %= TEN_POW_7;
len = u7toa_shift(buf, quo);
len = u07toa_shift(buf, n1, len);
} else {
len = u7toa_shift(buf, n1);
}
return u07toa_shift(buf, n, len);
}
return u7toa_shift(buf, n);
}
size_t i32toa(char buf[minimum_length(12)], int32_t n)
{
if (likely(n >= 0))
return u32toa(buf, n);
buf[0] = '-';
return 1 + u32toa(buf + 1, -(uint32_t)n);
}
size_t i64toa(char buf[minimum_length(22)], int64_t n)
{
if (likely(n >= 0))
return u64toa(buf, n);
buf[0] = '-';
return 1 + u64toa(buf + 1, -(uint64_t)n);
}
/* using u32toa_radix_length variant */
static uint8_t const radix_shift[64] = {
0, 0, 1, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0,
4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
size_t u32toa_radix(char buf[minimum_length(33)], uint32_t n, unsigned base)
{
int shift;
#ifdef USE_SPECIAL_RADIX_10
if (likely(base == 10))
return u32toa(buf, n);
#endif
if (n < base) {
buf[0] = digits36[n];
buf[1] = '\0';
return 1;
}
shift = radix_shift[base & 63];
if (shift) {
uint32_t mask = (1 << shift) - 1;
size_t len = (32 - clz32(n) + shift - 1) / shift;
size_t last = n & mask;
char *end = buf + len;
n >>= shift;
*end-- = '\0';
*end-- = digits36[last];
while (n >= base) {
size_t quo = n & mask;
n >>= shift;
*end-- = digits36[quo];
}
*end = digits36[n];
return len;
} else {
size_t len = 2;
size_t last = n % base;
n /= base;
uint32_t nbase = base;
while (n >= nbase) {
nbase *= base;
len++;
}
char *end = buf + len;
*end-- = '\0';
*end-- = digits36[last];
while (n >= base) {
size_t quo = n % base;
n /= base;
*end-- = digits36[quo];
}
*end = digits36[n];
return len;
}
}
size_t u64toa_radix(char buf[minimum_length(65)], uint64_t n, unsigned base)
{
int shift;
#ifdef USE_SPECIAL_RADIX_10
if (likely(base == 10))
return u64toa(buf, n);
#endif
shift = radix_shift[base & 63];
if (shift) {
if (n < base) {
buf[0] = digits36[n];
buf[1] = '\0';
return 1;
}
uint64_t mask = (1 << shift) - 1;
size_t len = (64 - clz64(n) + shift - 1) / shift;
size_t last = n & mask;
char *end = buf + len;
n >>= shift;
*end-- = '\0';
*end-- = digits36[last];
while (n >= base) {
size_t quo = n & mask;
n >>= shift;
*end-- = digits36[quo];
}
*end = digits36[n];
return len;
} else {
if (likely(n < 0x100000000))
return u32toa_radix(buf, n, base);
size_t last = n % base;
n /= base;
uint64_t nbase = base;
size_t len = 2;
while (n >= nbase) {
nbase *= base;
len++;
}
char *end = buf + len;
*end-- = '\0';
*end-- = digits36[last];
while (n >= base) {
size_t quo = n % base;
n /= base;
*end-- = digits36[quo];
}
*end = digits36[n];
return len;
}
}
size_t i32toa_radix(char buf[minimum_length(34)], int32_t n, unsigned int base)
{
if (likely(n >= 0))
return u32toa_radix(buf, n, base);
buf[0] = '-';
return 1 + u32toa_radix(buf + 1, -(uint32_t)n, base);
}
size_t i64toa_radix(char buf[minimum_length(66)], int64_t n, unsigned int base)
{
if (likely(n >= 0))
return u64toa_radix(buf, n, base);
buf[0] = '-';
return 1 + u64toa_radix(buf + 1, -(uint64_t)n, base);
}
#undef gen_digit
#undef TEN_POW_7
#undef USE_SPECIAL_RADIX_10
#undef USE_SINGLE_CASE_FAST
/*---- sorting with opaque argument ----*/
typedef void (*exchange_f)(void *a, void *b, size_t size);
typedef int (*cmp_f)(const void *, const void *, void *opaque);
static void exchange_bytes(void *a, void *b, size_t size) {
uint8_t *ap = (uint8_t *)a;
uint8_t *bp = (uint8_t *)b;
while (size-- != 0) {
uint8_t t = *ap;
*ap++ = *bp;
*bp++ = t;
}
}
static void exchange_one_byte(void *a, void *b, size_t size) {
uint8_t *ap = (uint8_t *)a;
uint8_t *bp = (uint8_t *)b;
uint8_t t = *ap;
*ap = *bp;
*bp = t;
}
static void exchange_int16s(void *a, void *b, size_t size) {
uint16_t *ap = (uint16_t *)a;
uint16_t *bp = (uint16_t *)b;
for (size /= sizeof(uint16_t); size-- != 0;) {
uint16_t t = *ap;
*ap++ = *bp;
*bp++ = t;
}
}
static void exchange_one_int16(void *a, void *b, size_t size) {
uint16_t *ap = (uint16_t *)a;
uint16_t *bp = (uint16_t *)b;
uint16_t t = *ap;
*ap = *bp;
*bp = t;
}
static void exchange_int32s(void *a, void *b, size_t size) {
uint32_t *ap = (uint32_t *)a;
uint32_t *bp = (uint32_t *)b;
for (size /= sizeof(uint32_t); size-- != 0;) {
uint32_t t = *ap;
*ap++ = *bp;
*bp++ = t;
}
}
static void exchange_one_int32(void *a, void *b, size_t size) {
uint32_t *ap = (uint32_t *)a;
uint32_t *bp = (uint32_t *)b;
uint32_t t = *ap;
*ap = *bp;
*bp = t;
}
static void exchange_int64s(void *a, void *b, size_t size) {
uint64_t *ap = (uint64_t *)a;
uint64_t *bp = (uint64_t *)b;
for (size /= sizeof(uint64_t); size-- != 0;) {
uint64_t t = *ap;
*ap++ = *bp;
*bp++ = t;
}
}
static void exchange_one_int64(void *a, void *b, size_t size) {
uint64_t *ap = (uint64_t *)a;
uint64_t *bp = (uint64_t *)b;
uint64_t t = *ap;
*ap = *bp;
*bp = t;
}
static void exchange_int128s(void *a, void *b, size_t size) {
uint64_t *ap = (uint64_t *)a;
uint64_t *bp = (uint64_t *)b;
for (size /= sizeof(uint64_t) * 2; size-- != 0; ap += 2, bp += 2) {
uint64_t t = ap[0];
uint64_t u = ap[1];
ap[0] = bp[0];
ap[1] = bp[1];
bp[0] = t;
bp[1] = u;
}
}
static void exchange_one_int128(void *a, void *b, size_t size) {
uint64_t *ap = (uint64_t *)a;
uint64_t *bp = (uint64_t *)b;
uint64_t t = ap[0];
uint64_t u = ap[1];
ap[0] = bp[0];
ap[1] = bp[1];
bp[0] = t;
bp[1] = u;
}
static inline exchange_f exchange_func(const void *base, size_t size) {
switch (((uintptr_t)base | (uintptr_t)size) & 15) {
case 0:
if (size == sizeof(uint64_t) * 2)
return exchange_one_int128;
else
return exchange_int128s;
case 8:
if (size == sizeof(uint64_t))
return exchange_one_int64;
else
return exchange_int64s;
case 4:
case 12:
if (size == sizeof(uint32_t))
return exchange_one_int32;
else
return exchange_int32s;
case 2:
case 6:
case 10:
case 14:
if (size == sizeof(uint16_t))
return exchange_one_int16;
else
return exchange_int16s;
default:
if (size == 1)
return exchange_one_byte;
else
return exchange_bytes;
}
}
static void heapsortx(void *base, size_t nmemb, size_t size, cmp_f cmp, void *opaque)
{
uint8_t *basep = (uint8_t *)base;
size_t i, n, c, r;
exchange_f swap = exchange_func(base, size);
if (nmemb > 1) {
i = (nmemb / 2) * size;
n = nmemb * size;
while (i > 0) {
i -= size;
for (r = i; (c = r * 2 + size) < n; r = c) {
if (c < n - size && cmp(basep + c, basep + c + size, opaque) <= 0)
c += size;
if (cmp(basep + r, basep + c, opaque) > 0)
break;
swap(basep + r, basep + c, size);
}
}
for (i = n - size; i > 0; i -= size) {
swap(basep, basep + i, size);
for (r = 0; (c = r * 2 + size) < i; r = c) {
if (c < i - size && cmp(basep + c, basep + c + size, opaque) <= 0)
c += size;
if (cmp(basep + r, basep + c, opaque) > 0)
break;
swap(basep + r, basep + c, size);
}
}
}
}
static inline void *med3(void *a, void *b, void *c, cmp_f cmp, void *opaque)
{
return cmp(a, b, opaque) < 0 ?
(cmp(b, c, opaque) < 0 ? b : (cmp(a, c, opaque) < 0 ? c : a )) :
(cmp(b, c, opaque) > 0 ? b : (cmp(a, c, opaque) < 0 ? a : c ));
}
/* pointer based version with local stack and insertion sort threshhold */
void rqsort(void *base, size_t nmemb, size_t size, cmp_f cmp, void *opaque)
{
struct { uint8_t *base; size_t count; int depth; } stack[50], *sp = stack;
uint8_t *ptr, *pi, *pj, *plt, *pgt, *top, *m;
size_t m4, i, lt, gt, span, span2;
int c, depth;
exchange_f swap = exchange_func(base, size);
exchange_f swap_block = exchange_func(base, size | 128);
if (nmemb < 2 || size <= 0)
return;
sp->base = (uint8_t *)base;
sp->count = nmemb;
sp->depth = 0;
sp++;
while (sp > stack) {
sp--;
ptr = sp->base;
nmemb = sp->count;
depth = sp->depth;
while (nmemb > 6) {
if (++depth > 50) {
/* depth check to ensure worst case logarithmic time */
heapsortx(ptr, nmemb, size, cmp, opaque);
nmemb = 0;
break;
}
/* select median of 3 from 1/4, 1/2, 3/4 positions */
/* should use median of 5 or 9? */
m4 = (nmemb >> 2) * size;
m = med3(ptr + m4, ptr + 2 * m4, ptr + 3 * m4, cmp, opaque);
swap(ptr, m, size); /* move the pivot to the start or the array */
i = lt = 1;
pi = plt = ptr + size;
gt = nmemb;
pj = pgt = top = ptr + nmemb * size;
for (;;) {
while (pi < pj && (c = cmp(ptr, pi, opaque)) >= 0) {
if (c == 0) {
swap(plt, pi, size);
lt++;
plt += size;
}
i++;
pi += size;
}
while (pi < (pj -= size) && (c = cmp(ptr, pj, opaque)) <= 0) {
if (c == 0) {
gt--;
pgt -= size;
swap(pgt, pj, size);
}
}
if (pi >= pj)
break;
swap(pi, pj, size);
i++;
pi += size;
}
/* array has 4 parts:
* from 0 to lt excluded: elements identical to pivot
* from lt to pi excluded: elements smaller than pivot
* from pi to gt excluded: elements greater than pivot
* from gt to n excluded: elements identical to pivot
*/
/* move elements identical to pivot in the middle of the array: */
/* swap values in ranges [0..lt[ and [i-lt..i[
swapping the smallest span between lt and i-lt is sufficient
*/
span = plt - ptr;
span2 = pi - plt;
lt = i - lt;
if (span > span2)
span = span2;
swap_block(ptr, pi - span, span);
/* swap values in ranges [gt..top[ and [i..top-(top-gt)[
swapping the smallest span between top-gt and gt-i is sufficient
*/
span = top - pgt;
span2 = pgt - pi;
pgt = top - span2;
gt = nmemb - (gt - i);
if (span > span2)
span = span2;
swap_block(pi, top - span, span);
/* now array has 3 parts:
* from 0 to lt excluded: elements smaller than pivot
* from lt to gt excluded: elements identical to pivot
* from gt to n excluded: elements greater than pivot
*/
/* stack the larger segment and keep processing the smaller one
to minimize stack use for pathological distributions */
if (lt > nmemb - gt) {
sp->base = ptr;
sp->count = lt;
sp->depth = depth;
sp++;
ptr = pgt;
nmemb -= gt;
} else {
sp->base = pgt;
sp->count = nmemb - gt;
sp->depth = depth;
sp++;
nmemb = lt;
}
}
/* Use insertion sort for small fragments */
for (pi = ptr + size, top = ptr + nmemb * size; pi < top; pi += size) {
for (pj = pi; pj > ptr && cmp(pj - size, pj, opaque) > 0; pj -= size)
swap(pj, pj - size, size);
}
}
}
/*---- Portable time functions ----*/
#if defined(_MSC_VER)
// From: https://stackoverflow.com/a/26085827
static int gettimeofday_msvc(struct timeval *tp, struct timezone *tzp)
{
static const uint64_t EPOCH = ((uint64_t)116444736000000000ULL);
SYSTEMTIME system_time;
FILETIME file_time;
uint64_t time;
GetSystemTime(&system_time);
SystemTimeToFileTime(&system_time, &file_time);
time = ((uint64_t)file_time.dwLowDateTime);
time += ((uint64_t)file_time.dwHighDateTime) << 32;
tp->tv_sec = (long)((time - EPOCH) / 10000000L);
tp->tv_usec = (long)(system_time.wMilliseconds * 1000);
return 0;
}
uint64_t js__hrtime_ns(void) {
LARGE_INTEGER counter, frequency;
double scaled_freq;
double result;
if (!QueryPerformanceFrequency(&frequency))
abort();
assert(frequency.QuadPart != 0);
if (!QueryPerformanceCounter(&counter))
abort();
assert(counter.QuadPart != 0);
/* Because we have no guarantee about the order of magnitude of the
* performance counter interval, integer math could cause this computation
* to overflow. Therefore we resort to floating point math.
*/
scaled_freq = (double) frequency.QuadPart / NANOSEC;
result = (double) counter.QuadPart / scaled_freq;
return (uint64_t) result;
}
#else
uint64_t js__hrtime_ns(void) {
struct timespec t;
if (clock_gettime(CLOCK_MONOTONIC, &t))
abort();
return t.tv_sec * NANOSEC + t.tv_nsec;
}
#endif
int64_t js__gettimeofday_us(void) {
struct timeval tv;
#if defined(_MSC_VER)
gettimeofday_msvc(&tv, NULL);
#else
gettimeofday(&tv, NULL);
#endif
return ((int64_t)tv.tv_sec * 1000000) + tv.tv_usec;
}
/*--- Cross-platform threading APIs. ----*/
#if !defined(EMSCRIPTEN) && !defined(__wasi__)
#if defined(_WIN32)
typedef void (*js__once_cb)(void);
typedef struct {
js__once_cb callback;
} js__once_data_t;
static BOOL WINAPI js__once_inner(INIT_ONCE *once, void *param, void **context) {
js__once_data_t *data = param;
data->callback();
return TRUE;
}
void js_once(js_once_t *guard, js__once_cb callback) {
js__once_data_t data = { .callback = callback };
InitOnceExecuteOnce(guard, js__once_inner, (void*) &data, NULL);
}
void js_mutex_init(js_mutex_t *mutex) {
InitializeCriticalSection(mutex);
}
void js_mutex_destroy(js_mutex_t *mutex) {
DeleteCriticalSection(mutex);
}
void js_mutex_lock(js_mutex_t *mutex) {
EnterCriticalSection(mutex);
}
void js_mutex_unlock(js_mutex_t *mutex) {
LeaveCriticalSection(mutex);
}
void js_cond_init(js_cond_t *cond) {
InitializeConditionVariable(cond);
}
void js_cond_destroy(js_cond_t *cond) {
/* nothing to do */
(void) cond;
}
void js_cond_signal(js_cond_t *cond) {
WakeConditionVariable(cond);
}
void js_cond_broadcast(js_cond_t *cond) {
WakeAllConditionVariable(cond);
}
void js_cond_wait(js_cond_t *cond, js_mutex_t *mutex) {
if (!SleepConditionVariableCS(cond, mutex, INFINITE))
abort();
}
int js_cond_timedwait(js_cond_t *cond, js_mutex_t *mutex, uint64_t timeout) {
if (SleepConditionVariableCS(cond, mutex, (DWORD)(timeout / 1e6)))
return 0;
if (GetLastError() != ERROR_TIMEOUT)
abort();
return -1;
}
#else /* !defined(_WIN32) */
void js_once(js_once_t *guard, void (*callback)(void)) {
if (pthread_once(guard, callback))
abort();
}
void js_mutex_init(js_mutex_t *mutex) {
if (pthread_mutex_init(mutex, NULL))
abort();
}
void js_mutex_destroy(js_mutex_t *mutex) {
if (pthread_mutex_destroy(mutex))
abort();
}
void js_mutex_lock(js_mutex_t *mutex) {
if (pthread_mutex_lock(mutex))
abort();
}
void js_mutex_unlock(js_mutex_t *mutex) {
if (pthread_mutex_unlock(mutex))
abort();
}
void js_cond_init(js_cond_t *cond) {
#if defined(__APPLE__) && defined(__MACH__)
if (pthread_cond_init(cond, NULL))
abort();
#else
pthread_condattr_t attr;
if (pthread_condattr_init(&attr))
abort();
if (pthread_condattr_setclock(&attr, CLOCK_MONOTONIC))
abort();
if (pthread_cond_init(cond, &attr))
abort();
if (pthread_condattr_destroy(&attr))
abort();
#endif
}
void js_cond_destroy(js_cond_t *cond) {
#if defined(__APPLE__) && defined(__MACH__)
/* It has been reported that destroying condition variables that have been
* signalled but not waited on can sometimes result in application crashes.
* See https://codereview.chromium.org/1323293005.
*/
pthread_mutex_t mutex;
struct timespec ts;
int err;
if (pthread_mutex_init(&mutex, NULL))
abort();
if (pthread_mutex_lock(&mutex))
abort();
ts.tv_sec = 0;
ts.tv_nsec = 1;
err = pthread_cond_timedwait_relative_np(cond, &mutex, &ts);
if (err != 0 && err != ETIMEDOUT)
abort();
if (pthread_mutex_unlock(&mutex))
abort();
if (pthread_mutex_destroy(&mutex))
abort();
#endif /* defined(__APPLE__) && defined(__MACH__) */
if (pthread_cond_destroy(cond))
abort();
}
void js_cond_signal(js_cond_t *cond) {
if (pthread_cond_signal(cond))
abort();
}
void js_cond_broadcast(js_cond_t *cond) {
if (pthread_cond_broadcast(cond))
abort();
}
void js_cond_wait(js_cond_t *cond, js_mutex_t *mutex) {
#if defined(__APPLE__) && defined(__MACH__)
int r;
errno = 0;
r = pthread_cond_wait(cond, mutex);
/* Workaround for a bug in OS X at least up to 13.6
* See https://github.com/libuv/libuv/issues/4165
*/
if (r == EINVAL && errno == EBUSY)
return;
if (r)
abort();
#else
if (pthread_cond_wait(cond, mutex))
abort();
#endif
}
int js_cond_timedwait(js_cond_t *cond, js_mutex_t *mutex, uint64_t timeout) {
int r;
struct timespec ts;
#if !defined(__APPLE__)
timeout += js__hrtime_ns();
#endif
ts.tv_sec = timeout / NANOSEC;
ts.tv_nsec = timeout % NANOSEC;
#if defined(__APPLE__) && defined(__MACH__)
r = pthread_cond_timedwait_relative_np(cond, mutex, &ts);
#else
r = pthread_cond_timedwait(cond, mutex, &ts);
#endif
if (r == 0)
return 0;
if (r == ETIMEDOUT)
return -1;
abort();
/* Pacify some compilers. */
return -1;
}
#endif
#endif /* !defined(EMSCRIPTEN) && !defined(__wasi__) */
#pragma GCC visibility pop
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