usr/src/lib/libc/port/locale/strxfrm.c

   1 /*
   2  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
   3  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
   4  * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
   5  *              at Electronni Visti IA, Kiev, Ukraine.
   6  *                      All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include "lint.h"
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <errno.h>
  34 #include <wchar.h>
  35 #include <assert.h>
  36 #include <xlocale.h>
  37 #include "collate.h"
  38
  39 size_t
  40 strxfrm_l(char *_RESTRICT_KYWD xf, const char *_RESTRICT_KYWD src,
  41     size_t dlen, locale_t loc)
  42 {
  43         size_t slen;
  44         size_t xlen;
  45         wchar_t *wcs = NULL;
  46
  47         if (!*src) {
  48                 if (dlen > 0)
  49                         *xf = '\0';
  50                 return (0);
  51         }
  52
  53         /*
  54          * The conversion from multibyte to wide character strings is
  55          * strictly reducing (one byte of an mbs cannot expand to more
  56          * than one wide character.)
  57          */
  58         slen = strlen(src);
  59
  60         if (loc->collate->lc_is_posix)
  61                 goto error;
  62
  63         if ((wcs = malloc((slen + 1) * sizeof (wchar_t))) == NULL)
  64                 goto error;
  65
  66         if (mbstowcs_l(wcs, src, slen + 1, loc) == (size_t)-1)
  67                 goto error;
  68
  69         if ((xlen = _collate_sxfrm(wcs, xf, dlen, loc)) == (size_t)-1)
  70                 goto error;
  71
  72         if (wcs)
  73                 free(wcs);
  74
  75         if (dlen > xlen) {
  76                 xf[xlen] = 0;
  77         } else if (dlen) {
  78                 xf[dlen-1] = 0;
  79         }
  80
  81         return (xlen);
  82
  83 error:
  84         /* errno should be set to ENOMEM if malloc failed */
  85         if (wcs)
  86                 free(wcs);
  87         (void) strlcpy(xf, src, dlen);
  88
  89         return (slen);
  90 }
  91
  92 size_t
  93 strxfrm(char *_RESTRICT_KYWD xf, const char *_RESTRICT_KYWD src, size_t dlen)
  94 {
  95         return (strxfrm_l(xf, src, dlen, uselocale(NULL)));
  96 }