/*-*- 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 mbsrtowcs(wchar_t *ws, const char **src, size_t wn, mbstate_t *st) { const unsigned char *s = (const void *)*src; size_t wn0 = wn; unsigned c = 0; if (st && (c = *(unsigned *)st)) { if (ws) { *(unsigned *)st = 0; goto resume; } else { goto resume0; } } 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--; } *ws = 0; *src = 0; return wn0 - wn; } 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; } } #endif if (*s - 1u < 0x7f) { s++; wn--; continue; } if (*s - SA > SB - SA) break; c = kMbBittab[*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++; } } 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; } } #endif if (*s - 1u < 0x7f) { *ws++ = *s++; wn--; continue; } if (*s - SA > SB - SA) break; c = kMbBittab[*s++ - SA]; resume: 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; if (c & (1U << 31)) { if (*s - 0x80u >= 0x40) { s -= 3; break; } c = (c << 6) | *s++ - 0x80; } } *ws++ = c; wn--; c = 0; } if (!c && !*s) { if (ws) { *ws = 0; *src = 0; } return wn0 - wn; } errno = EILSEQ; if (ws) *src = (const void *)s; return -1; }