lib/libc/string/strxfrm.c

   1 /*
   2  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
   3  * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
   4  *              at Electronni Visti IA, Kiev, Ukraine.
   5  *                      All rights reserved.
   6  *
   7  * Copyright (c) 2011 The FreeBSD Foundation
   8  * All rights reserved.
   9  * Portions of this software were developed by David Chisnall
  10  * under sponsorship from the FreeBSD Foundation.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <errno.h>
  37 #include <wchar.h>
  38 #include "collate.h"
  39
  40 size_t
  41 strxfrm_l(char * __restrict dest, const char * __restrict src, size_t len, locale_t loc);
  42 size_t
  43 strxfrm(char * __restrict dest, const char * __restrict src, size_t len)
  44 {
  45         return strxfrm_l(dest, src, len, __get_locale());
  46 }
  47
  48 size_t
  49 strxfrm_l(char * __restrict dest, const char * __restrict src, size_t len, locale_t locale)
  50 {
  51         size_t slen;
  52         size_t xlen;
  53         wchar_t *wcs = NULL;
  54
  55         FIX_LOCALE(locale);
  56         struct xlocale_collate *table =
  57                 (struct xlocale_collate*)locale->components[XLC_COLLATE];
  58
  59         if (!*src) {
  60                 if (len > 0)
  61                         *dest = '\0';
  62                 return (0);
  63         }
  64
  65         /*
  66          * The conversion from multibyte to wide character strings is
  67          * strictly reducing (one byte of an mbs cannot expand to more
  68          * than one wide character.)
  69          */
  70         slen = strlen(src);
  71
  72         if (table->__collate_load_error)
  73                 goto error;
  74
  75         if ((wcs = malloc((slen + 1) * sizeof (wchar_t))) == NULL)
  76                 goto error;
  77
  78         if (mbstowcs_l(wcs, src, slen + 1, locale) == (size_t)-1)
  79                 goto error;
  80
  81         if ((xlen = _collate_sxfrm(table, wcs, dest, len)) == (size_t)-1)
  82                 goto error;
  83
  84         if (wcs)
  85                 free(wcs);
  86
  87         if (len > xlen) {
  88                 dest[xlen] = 0;
  89         } else if (len) {
  90                 dest[len-1] = 0;
  91         }
  92
  93         return (xlen);
  94
  95 error:
  96         /* errno should be set to ENOMEM if malloc failed */
  97         if (wcs)
  98                 free(wcs);
  99         (void) strlcpy(dest, src, len);
 100
 101         return (slen);
 102 }