mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
11ec99931b
These are standard functions that are needed to help support the Skull language. Note that normally this codebase uses libc/str/thompike.h See #105
85 lines
3.8 KiB
C
85 lines
3.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╚──────────────────────────────────────────────────────────────────────────────╝
|
|
│ │
|
|
│ Musl Libc │
|
|
│ Copyright © 2005-2014 Rich Felker, et al. │
|
|
│ │
|
|
│ 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 "libc/errno.h"
|
|
#include "libc/limits.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/str/mb.internal.h"
|
|
#include "libc/str/str.h"
|
|
|
|
asm(".ident\t\"\\n\\n\
|
|
Musl libc (MIT License)\\n\
|
|
Copyright 2005-2014 Rich Felker, et. al.\"");
|
|
asm(".include \"libc/disclaimer.inc\"");
|
|
|
|
size_t mbrtowc(wchar_t *wc, const char *src, size_t n, mbstate_t *st) {
|
|
static unsigned internal_state;
|
|
long wut;
|
|
unsigned c;
|
|
const unsigned char *s = (const void *)src;
|
|
const unsigned N = n;
|
|
wchar_t dummy;
|
|
if (!st) st = (void *)&internal_state;
|
|
c = *(unsigned *)st;
|
|
if (!s) {
|
|
if (c) goto ilseq;
|
|
return 0;
|
|
} else if (!wc) {
|
|
wc = &dummy;
|
|
}
|
|
if (!n) return -2;
|
|
if (!c) {
|
|
if (*s < 0x80) return !!(*wc = *s);
|
|
if (MB_CUR_MAX == 1) return (*wc = CODEUNIT(*s)), 1;
|
|
if (*s - SA > SB - SA) goto ilseq;
|
|
wut = *s++ - SA;
|
|
wut = MAX(0, MIN(ARRAYLEN(kMbBittab) - 1, wut));
|
|
c = kMbBittab[wut];
|
|
n--;
|
|
}
|
|
if (n) {
|
|
if (OOB(c, *s)) goto ilseq;
|
|
loop:
|
|
c = c << 6 | *s++ - 0x80;
|
|
n--;
|
|
if (!(c & (1U << 31))) {
|
|
*(unsigned *)st = 0;
|
|
*wc = c;
|
|
return N - n;
|
|
}
|
|
if (n) {
|
|
if (*s - 0x80u >= 0x40) goto ilseq;
|
|
goto loop;
|
|
}
|
|
}
|
|
*(unsigned *)st = c;
|
|
return -2;
|
|
ilseq:
|
|
*(unsigned *)st = 0;
|
|
errno = EILSEQ;
|
|
return -1;
|
|
}
|