string/FreeBSD/wcsxfrm.c

   1 /*-
   2  * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
   3  *              at Electronni Visti IA, Kiev, Ukraine.
   4  *                      All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #if 0
  30 __FBSDID("FreeBSD: src/lib/libc/string/strxfrm.c,v 1.15 2002/09/06 11:24:06 tjr Exp ");
  31 #endif
  32 __FBSDID("$FreeBSD: src/lib/libc/string/wcsxfrm.c,v 1.3 2004/04/07 09:47:56 tjr Exp $");
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <wchar.h>
  37 #include "collate.h"
  38
  39 static char *__mbsdup(const wchar_t *);
  40
  41 /*
  42  * Placeholder wcsxfrm() implementation. See wcscoll.c for a description of
  43  * the logic used.
  44  */
  45 size_t
  46 wcsxfrm(wchar_t * __restrict dest, const wchar_t * __restrict src, size_t len)
  47 {
  48         int prim, sec, l;
  49         size_t slen;
  50         char *mbsrc, *s, *ss;
  51
  52         if (*src == L'\0') {
  53                 if (len != 0)
  54                         *dest = L'\0';
  55                 return (0);
  56         }
  57
  58         if (__collate_load_error || MB_CUR_MAX > 1) {
  59                 slen = wcslen(src);
  60                 if (len > 0) {
  61                         if (slen < len)
  62                                 wcscpy(dest, src);
  63                         else {
  64                                 wcsncpy(dest, src, len - 1);
  65                                 dest[len - 1] = L'\0';
  66                         }
  67                 }
  68                 return (slen);
  69         }
  70
  71         mbsrc = __mbsdup(src);
  72         slen = 0;
  73         prim = sec = 0;
  74         ss = s = __collate_substitute(mbsrc);
  75         while (*s != '\0') {
  76                 while (*s != '\0' && prim == 0) {
  77                         __collate_lookup(s, &l, &prim, &sec);
  78                         s += l;
  79                 }
  80                 if (prim != 0) {
  81                         if (len > 1) {
  82                                 *dest++ = (wchar_t)prim;
  83                                 len--;
  84                         }
  85                         slen++;
  86                         prim = 0;
  87                 }
  88         }
  89         free(ss);
  90         free(mbsrc);
  91         if (len != 0)
  92                 *dest = L'\0';
  93
  94         return (slen);
  95 }
  96
  97 static char *
  98 __mbsdup(const wchar_t *ws)
  99 {
 100         static const mbstate_t initial;
 101         mbstate_t st;
 102         const wchar_t *wcp;
 103         size_t len;
 104         char *mbs;
 105
 106         wcp = ws;
 107         st = initial;
 108         if ((len = wcsrtombs(NULL, &wcp, 0, &st)) == (size_t)-1)
 109                 return (NULL);
 110         if ((mbs = malloc(len + 1)) == NULL)
 111                 return (NULL);
 112         st = initial;
 113         wcsrtombs(mbs, &ws, len + 1, &st);
 114
 115         return (mbs);
 116 }