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/*
* This code was written by Rich Felker in 2010; no copyright is claimed.
* This code is in the public domain. Attribution is appreciated but
* unnecessary.
*/
#include <stdlib.h>
#include <inttypes.h>
#include <wchar.h>
#include <errno.h>
#include "internal.h"
size_t mbsrtowcs(wchar_t *ws, const char **src, size_t wn, mbstate_t *st)
{
unsigned c;
const unsigned char *s = *src;
const wchar_t *wsorig = ws;
if (!st) st = (void *)&c, c = 0;
else c = *(unsigned *)st;
if (c) {
*(unsigned *)st = 0;
if (!ws) {
wn = 0;
goto resume0;
}
goto resume;
}
if (!ws) for (wn=0;;) {
if ((unsigned)*s-SA >= SB-SA) {
while (((unsigned)s&3) && (unsigned)*s-1<0x7f) s++, wn++;
while (!(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) s+=4, wn+=4;
while ((unsigned)*s-1<0x7f) s++, wn++;
if (!*s) return wn;
if ((unsigned)*s-SA >= SB-SA) goto ilseq2;
}
c = bittab[*s++-SA];
do {
resume0:
if (OOB(c,*s)) goto ilseq2; s++;
c <<= 6; if (!(c&(1U<<31))) break;
#ifdef I_FAILED_TO_RTFM_RFC3629
if ((unsigned)*s++-0x80 >= 0x40) goto ilseq2;
c <<= 6; if (!(c&(1U<<31))) break;
if ((unsigned)*s++-0x80 >= 0x40) goto ilseq2;
c <<= 6; if (!(c&(1U<<31))) break;
#endif
if ((unsigned)*s++-0x80 >= 0x40) goto ilseq2;
c <<= 6; if (!(c&(1U<<31))) break;
if ((unsigned)*s++-0x80 >= 0x40) goto ilseq2;
} while (0);
wn++; c = 0;
}
while (wn) {
if ((unsigned)*s-SA >= SB-SA) {
if (wn >= 7) {
while (((unsigned)s&3) && (unsigned)*s-1<0x7f) {
*ws++ = *s++;
wn--;
}
while (wn>=4 && !(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
*ws++ = *s++;
*ws++ = *s++;
*ws++ = *s++;
*ws++ = *s++;
wn -= 4;
}
}
while (wn && (unsigned)*s-1<0x7f) {
*ws++ = *s++;
wn--;
}
if (!wn) break;
if (!*s) {
*ws = 0;
*src = 0;
return ws-wsorig;
}
if ((unsigned)*s-SA >= SB-SA) goto ilseq;
}
c = bittab[*s++-SA];
do {
resume:
if (OOB(c,*s)) goto ilseq;
c = (c<<6) | *s++-0x80;
if (!(c&(1U<<31))) break;
#ifdef I_FAILED_TO_RTFM_RFC3629
if ((unsigned)*s-0x80 >= 0x40) goto ilseq;
c = (c<<6) | *s++-0x80;
if (!(c&(1U<<31))) break;
if ((unsigned)*s-0x80 >= 0x40) goto ilseq;
c = (c<<6) | *s++-0x80;
if (!(c&(1U<<31))) break;
#endif
if ((unsigned)*s-0x80 >= 0x40) goto ilseq;
c = (c<<6) | *s++-0x80;
if (!(c&(1U<<31))) break;
if ((unsigned)*s-0x80 >= 0x40) goto ilseq;
c = (c<<6) | *s++-0x80;
} while (0);
*ws++ = c; wn--; c = 0;
}
*src = s;
return ws-wsorig;
ilseq:
*src = s;
ilseq2:
/* enter permanently failing state */
*(unsigned *)st = FAILSTATE;
errno = EILSEQ;
return -1;
}
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