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  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28 
  29 #include "lint.h"
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <wchar.h>
  34 #include <assert.h>
  35 #include "collate.h"
  36 
  37 size_t
  38 strxfrm(char *_RESTRICT_KYWD xf, const char *_RESTRICT_KYWD src, size_t dlen)
  39 {
  40         size_t slen;
  41         size_t xlen;
  42         wchar_t *wcs = NULL;
  43 
  44         if (!*src) {
  45                 if (dlen > 0)
  46                         *xf = '\0';
  47                 return (0);
  48         }
  49 
  50         /*
  51          * The conversion from multibyte to wide character strings is
  52          * strictly reducing (one byte of an mbs cannot expand to more
  53          * than one wide character.)
  54          */
  55         slen = strlen(src);
  56 
  57         if (_collate_load_error)
  58                 goto error;
  59 
  60         if ((wcs = malloc((slen + 1) * sizeof (wchar_t))) == NULL)
  61                 goto error;
  62 
  63         if (mbstowcs(wcs, src, slen + 1) == (size_t)-1)
  64                 goto error;
  65 
  66         if ((xlen = _collate_sxfrm(wcs, xf, dlen)) == (size_t)-1)
  67                 goto error;
  68 
  69         if (wcs)
  70                 free(wcs);
  71 
  72         if (dlen > xlen) {
  73                 xf[xlen] = 0;
  74         } else if (dlen) {
  75                 xf[dlen-1] = 0;
  76         }
  77 
  78         return (xlen);
  79 
  80 error:
  81         /* errno should be set to ENOMEM if malloc failed */
  82         if (wcs)
  83                 free(wcs);
  84         (void) strlcpy(xf, src, dlen);
  85 
  86         return (slen);
  87 }