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Viewing changes to system/lib/libc/musl/src/multibyte/mbsrtowcs.c

  • Committer: Package Import Robot
  • Author(s): Sylvestre Ledru
  • Date: 2013-05-02 13:11:51 UTC
  • Revision ID: package-import@ubuntu.com-20130502131151-q8dvteqr1ef2x7xz
Tags: upstream-1.4.1~20130504~adb56cb
Import upstream version 1.4.1~20130504~adb56cb

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system/lib/libc/musl/src/multibyte/mbsrtowcs.c
 
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/* 
 
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 * This code was written by Rich Felker in 2010; no copyright is claimed.
 
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 * This code is in the public domain. Attribution is appreciated but
 
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 * unnecessary.
 
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 */
 
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#include <stdlib.h>
 
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#include <inttypes.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 mbsrtowcs(wchar_t *restrict ws, const char **restrict src, size_t wn, mbstate_t *restrict st)
 
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{
 
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        const unsigned char *s = (const void *)*src;
 
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        size_t wn0 = wn;
 
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        unsigned c = 0;
 
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        if (st && (c = *(unsigned *)st)) {
 
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                if (ws) {
 
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                        *(unsigned *)st = 0;
 
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                        goto resume;
 
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                } else {
 
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                        goto resume0;
 
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                }
 
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        }
 
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        if (!ws) for (;;) {
 
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                if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
 
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                        while (!(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
 
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                                s += 4;
 
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                                wn -= 4;
 
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                        }
 
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                }
 
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                if (*s-1u < 0x7f) {
 
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                        s++;
 
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                        wn--;
 
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                        continue;
 
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                }
 
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                if (*s-SA > SB-SA) break;
 
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                c = bittab[*s++-SA];
 
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resume0:
 
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                if (OOB(c,*s)) { s--; break; }
 
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                s++;
 
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                if (c&(1U<<25)) {
 
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                        if (*s-0x80u >= 0x40) { s-=2; break; }
 
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                        s++;
 
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                        if (c&(1U<<19)) {
 
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                                if (*s-0x80u >= 0x40) { s-=3; break; }
 
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                                s++;
 
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                        }
 
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                }
 
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                wn--;
 
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                c = 0;
 
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        } else for (;;) {
 
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                if (!wn) return wn0;
 
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                if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
 
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                        while (wn>=4 && !(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
 
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                                *ws++ = *s++;
 
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                                *ws++ = *s++;
 
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                                *ws++ = *s++;
 
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                                *ws++ = *s++;
 
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                                wn -= 4;
 
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                        }
 
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                }
 
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                if (*s-1u < 0x7f) {
 
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                        *ws++ = *s++;
 
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                        wn--;
 
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                        continue;
 
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                }
 
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                if (*s-SA > SB-SA) break;
 
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                c = bittab[*s++-SA];
 
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resume:
 
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                if (OOB(c,*s)) { s--; break; }
 
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                c = (c<<6) | *s++-0x80;
 
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                if (c&(1U<<31)) {
 
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                        if (*s-0x80u >= 0x40) { s-=2; break; }
 
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                        c = (c<<6) | *s++-0x80;
 
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                        if (c&(1U<<31)) {
 
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                                if (*s-0x80u >= 0x40) { s-=3; break; }
 
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                                c = (c<<6) | *s++-0x80;
 
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                        }
 
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                }
 
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                *ws++ = c;
 
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                wn--;
 
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                c = 0;
 
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        }
 
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        if (!c && !*s) {
 
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                if (ws) {
 
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                        *ws = 0;
 
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                        *src = 0;
 
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                }
 
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                return wn0-wn;
 
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        }
 
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        errno = EILSEQ;
 
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        if (ws) *src = (const void *)s;
 
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        return -1;
 
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}