-/*
- * 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 <stdint.h>
#include <wchar.h>
#include <errno.h>
-
+#include <string.h>
+#include <stdlib.h>
#include "internal.h"
size_t mbsrtowcs(wchar_t *restrict ws, const char **restrict src, size_t wn, mbstate_t *restrict st)
{
- unsigned c;
const unsigned char *s = (const void *)*src;
- const wchar_t *wsorig = ws;
+ size_t wn0 = wn;
+ unsigned c = 0;
- if (!st) st = (void *)&c, c = 0;
- else c = *(unsigned *)st;
-
- if (c) {
- *(unsigned *)st = 0;
- if (!ws) {
- wn = 0;
+ if (st && (c = *(unsigned *)st)) {
+ if (ws) {
+ *(unsigned *)st = 0;
+ goto resume;
+ } else {
goto resume0;
}
- goto resume;
}
- if (!ws) for (wn=0;;) {
- if (*s-SA >= SB-SA) {
- while (((uintptr_t)s&3) && *s-1u<0x7f) s++, wn++;
- while (!(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) s+=4, wn+=4;
- while (*s-1u<0x7f) s++, wn++;
- if (!*s) return wn;
- if (*s-SA >= SB-SA) goto ilseq2;
+ if (MB_CUR_MAX==1) {
+ if (!ws) return strlen((const char *)s);
+ for (;;) {
+ if (!wn) {
+ *src = (const void *)s;
+ return wn0;
+ }
+ if (!*s) break;
+ c = *s++;
+ *ws++ = CODEUNIT(c);
+ wn--;
}
- c = bittab[*s++-SA];
- do {
-resume0:
- if (OOB(c,*s)) goto ilseq2; s++;
- c <<= 6; if (!(c&(1U<<31))) break;
- if (*s++-0x80u >= 0x40) goto ilseq2;
- c <<= 6; if (!(c&(1U<<31))) break;
- if (*s++-0x80u >= 0x40) goto ilseq2;
- } while (0);
- wn++; c = 0;
+ *ws = 0;
+ *src = 0;
+ return wn0-wn;
}
- while (wn) {
- if (*s-SA >= SB-SA) {
- if (wn >= 7) {
- while (((uintptr_t)s&3) && *s-1u<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;
- }
+ if (!ws) for (;;) {
+#ifdef __GNUC__
+ typedef uint32_t __attribute__((__may_alias__)) w32;
+ if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
+ while (!(( *(w32*)s | *(w32*)s-0x01010101) & 0x80808080)) {
+ s += 4;
+ wn -= 4;
}
- while (wn && *s-1u<0x7f) {
- *ws++ = *s++;
- wn--;
+ }
+#endif
+ if (*s-1u < 0x7f) {
+ s++;
+ wn--;
+ continue;
+ }
+ if (*s-SA > SB-SA) break;
+ c = bittab[*s++-SA];
+resume0:
+ if (OOB(c,*s)) { s--; break; }
+ s++;
+ if (c&(1U<<25)) {
+ if (*s-0x80u >= 0x40) { s-=2; break; }
+ s++;
+ if (c&(1U<<19)) {
+ if (*s-0x80u >= 0x40) { s-=3; break; }
+ s++;
}
- if (!wn) break;
- if (!*s) {
- *ws = 0;
- *src = 0;
- return ws-wsorig;
+ }
+ wn--;
+ c = 0;
+ } else for (;;) {
+ if (!wn) {
+ *src = (const void *)s;
+ return wn0;
+ }
+#ifdef __GNUC__
+ typedef uint32_t __attribute__((__may_alias__)) w32;
+ if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
+ while (wn>=5 && !(( *(w32*)s | *(w32*)s-0x01010101) & 0x80808080)) {
+ *ws++ = *s++;
+ *ws++ = *s++;
+ *ws++ = *s++;
+ *ws++ = *s++;
+ wn -= 4;
}
- if (*s-SA >= SB-SA) goto ilseq;
}
+#endif
+ if (*s-1u < 0x7f) {
+ *ws++ = *s++;
+ wn--;
+ continue;
+ }
+ if (*s-SA > SB-SA) break;
c = bittab[*s++-SA];
- do {
resume:
- if (OOB(c,*s)) goto ilseq;
- c = (c<<6) | *s++-0x80;
- if (!(c&(1U<<31))) break;
-
- if (*s-0x80u >= 0x40) goto ilseq;
- c = (c<<6) | *s++-0x80;
- if (!(c&(1U<<31))) break;
-
- if (*s-0x80u >= 0x40) goto ilseq;
+ if (OOB(c,*s)) { s--; break; }
+ c = (c<<6) | *s++-0x80;
+ if (c&(1U<<31)) {
+ if (*s-0x80u >= 0x40) { s-=2; break; }
c = (c<<6) | *s++-0x80;
- } while (0);
+ if (c&(1U<<31)) {
+ if (*s-0x80u >= 0x40) { s-=3; break; }
+ c = (c<<6) | *s++-0x80;
+ }
+ }
+ *ws++ = c;
+ wn--;
+ c = 0;
+ }
- *ws++ = c; wn--; c = 0;
+ if (!c && !*s) {
+ if (ws) {
+ *ws = 0;
+ *src = 0;
+ }
+ return wn0-wn;
}
- *src = (const void *)s;
- return ws-wsorig;
-ilseq:
- *src = (const void *)s;
-ilseq2:
- /* enter permanently failing state */
- *(unsigned *)st = FAILSTATE;
errno = EILSEQ;
+ if (ws) *src = (const void *)s;
return -1;
}
projects / musl / blobdiff