52 lines
953 B
C
52 lines
953 B
C
#include <stdlib.h>
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#include <wchar.h>
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#include <errno.h>
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#include "internal.h"
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size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate_t *restrict st)
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{
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static unsigned internal_state;
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unsigned c;
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const unsigned char *s = (const void *)src;
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const unsigned N = n;
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wchar_t dummy;
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if (!st) st = (void *)&internal_state;
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c = *(unsigned *)st;
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if (!s) {
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if (c) goto ilseq;
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return 0;
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} else if (!wc) wc = &dummy;
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if (!n) return -2;
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if (!c) {
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if (*s < 0x80) return !!(*wc = *s);
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if (MB_CUR_MAX==1) return (*wc = CODEUNIT(*s)), 1;
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if (*s-SA > SB-SA) goto ilseq;
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c = bittab[*s++-SA]; n--;
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}
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if (n) {
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if (OOB(c,*s)) goto ilseq;
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loop:
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c = c<<6 | *s++-0x80; n--;
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if (!(c&(1U<<31))) {
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*(unsigned *)st = 0;
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*wc = c;
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return N-n;
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}
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if (n) {
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if (*s-0x80u >= 0x40) goto ilseq;
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goto loop;
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}
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}
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*(unsigned *)st = c;
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return -2;
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ilseq:
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*(unsigned *)st = 0;
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errno = EILSEQ;
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return -1;
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}
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