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Add Musl multibyte functions

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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
This commit is contained in:
Justine Tunney 2021-03-06 09:52:29 -08:00
parent cfd453d125
commit 11ec99931b
28 changed files with 1064 additions and 131 deletions
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94
libc/str/mbsnrtowcs.c Normal file
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/*-*- 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 mbsnrtowcs(wchar_t *wcs, const char **src, size_t n, size_t wn,
mbstate_t *st) {
size_t l, cnt = 0, n2;
wchar_t *ws, wbuf[256];
const char *s = *src;
const char *tmp_s;
if (!wcs) {
ws = wbuf, wn = sizeof(wbuf) / sizeof(*wbuf);
} else {
ws = wcs;
}
/* making sure output buffer size is at most n/4 will ensure
* that mbsrtowcs never reads more than n input bytes. thus
* we can use mbsrtowcs as long as it's practical.. */
while (s && wn && ((n2 = n / 4) >= wn || n2 > 32)) {
if (n2 >= wn) n2 = wn;
tmp_s = s;
l = mbsrtowcs(ws, &s, n2, st);
if (!(l + 1)) {
cnt = l;
wn = 0;
break;
}
if (ws != wbuf) {
ws += l;
wn -= l;
}
n = s ? n - (s - tmp_s) : 0;
cnt += l;
}
if (s)
while (wn && n) {
l = mbrtowc(ws, s, n, st);
if (l + 2 <= 2) {
if (!(l + 1)) {
cnt = l;
break;
}
if (!l) {
s = 0;
break;
}
/* have to roll back partial character */
*(unsigned *)st = 0;
break;
}
s += l;
n -= l;
/* safe - this loop runs fewer than sizeof(wbuf)/8 times */
ws++;
wn--;
cnt++;
}
if (wcs) *src = s;
return cnt;
}