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quickjs/cutils.c
bellard 7c312df422 2020-09-06 release
2020-09-06 19:10:15 +02:00

632 lines
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C
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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 <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include "cutils.h"
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 uint8_t *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 uint8_t *data, 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, 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));
}
/* Note: at most 31 bits are encoded. At most UTF8_CHAR_LEN_MAX bytes
are output. */
int unicode_to_utf8(uint8_t *buf, unsigned int c)
{
uint8_t *q = buf;
if (c < 0x80) {
*q++ = c;
} else {
if (c < 0x800) {
*q++ = (c >> 6) | 0xc0;
} else {
if (c < 0x10000) {
*q++ = (c >> 12) | 0xe0;
} else {
if (c < 0x00200000) {
*q++ = (c >> 18) | 0xf0;
} else {
if (c < 0x04000000) {
*q++ = (c >> 24) | 0xf8;
} else if (c < 0x80000000) {
*q++ = (c >> 30) | 0xfc;
*q++ = ((c >> 24) & 0x3f) | 0x80;
} else {
return 0;
}
*q++ = ((c >> 18) & 0x3f) | 0x80;
}
*q++ = ((c >> 12) & 0x3f) | 0x80;
}
*q++ = ((c >> 6) & 0x3f) | 0x80;
}
*q++ = (c & 0x3f) | 0x80;
}
return q - buf;
}
static const unsigned int utf8_min_code[5] = {
0x80, 0x800, 0x10000, 0x00200000, 0x04000000,
};
static const unsigned char utf8_first_code_mask[5] = {
0x1f, 0xf, 0x7, 0x3, 0x1,
};
/* return -1 if error. *pp is not updated in this case. max_len must
be >= 1. The maximum length for a UTF8 byte sequence is 6 bytes. */
int unicode_from_utf8(const uint8_t *p, int max_len, const uint8_t **pp)
{
int l, c, b, i;
c = *p++;
if (c < 0x80) {
*pp = p;
return c;
}
switch(c) {
case 0xc0: case 0xc1: 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:
l = 1;
break;
case 0xe0: 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:
l = 2;
break;
case 0xf0: case 0xf1: case 0xf2: case 0xf3:
case 0xf4: case 0xf5: case 0xf6: case 0xf7:
l = 3;
break;
case 0xf8: case 0xf9: case 0xfa: case 0xfb:
l = 4;
break;
case 0xfc: case 0xfd:
l = 5;
break;
default:
return -1;
}
/* check that we have enough characters */
if (l > (max_len - 1))
return -1;
c &= utf8_first_code_mask[l - 1];
for(i = 0; i < l; i++) {
b = *p++;
if (b < 0x80 || b >= 0xc0)
return -1;
c = (c << 6) | (b & 0x3f);
}
if (c < utf8_min_code[l - 1])
return -1;
*pp = p;
return c;
}
#if 0
#if defined(EMSCRIPTEN) || defined(__ANDROID__)
static void *rqsort_arg;
static int (*rqsort_cmp)(const void *, const void *, void *);
static int rqsort_cmp2(const void *p1, const void *p2)
{
return rqsort_cmp(p1, p2, rqsort_arg);
}
/* not reentrant, but not needed with emscripten */
void rqsort(void *base, size_t nmemb, size_t size,
int (*cmp)(const void *, const void *, void *),
void *arg)
{
rqsort_arg = arg;
rqsort_cmp = cmp;
qsort(base, nmemb, size, rqsort_cmp2);
}
#endif
#else
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);
}
}
}
#endif
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