| #include "internal.h" |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <wchar.h> |
| |
| size_t mbrtowc(wchar_t* restrict wc, const char* restrict src, size_t n, mbstate_t* restrict st) { |
| static unsigned internal_state; |
| 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; |
| c = bittab[*s++ - SA]; |
| 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; |
| } |
