lib/libc/string/strxfrm.c

   1 /*      $NetBSD: strxfrm.c,v 1.14 2013/05/17 12:55:57 joerg Exp $       */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 #if 0
  38 static char sccsid[] = "@(#)strxfrm.c   8.1 (Berkeley) 6/4/93";
  39 #else
  40 __RCSID("$NetBSD: strxfrm.c,v 1.14 2013/05/17 12:55:57 joerg Exp $");
  41 #endif
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 #include "namespace.h"
  45
  46 #include <assert.h>
  47 #include <locale.h>
  48 #include <string.h>
  49 #include "setlocale_local.h"
  50
  51 __weak_alias(strxfrm_l, _strxfrm_l)
  52
  53 /*
  54  * Transform src, storing the result in dst, such that
  55  * strcmp() on transformed strings returns what strcoll()
  56  * on the original untransformed strings would return.
  57  */
  58 size_t
  59 strxfrm_l(char *dst, const char *src, size_t n, locale_t loc)
  60 {
  61         size_t srclen, copysize;
  62
  63         _DIAGASSERT(src != NULL);
  64
  65         /* XXX: LC_COLLATE should be implemented. */
  66         /* LINTED */(void)loc;
  67
  68         /*
  69          * Since locales are unimplemented, this is just a copy.
  70          */
  71         srclen = strlen(src);
  72         if (n != 0) {
  73                 _DIAGASSERT(dst != NULL);
  74                 copysize = srclen < n ? srclen : n - 1;
  75                 (void)memcpy(dst, src, copysize);
  76                 dst[copysize] = 0;
  77         }
  78         return (srclen);
  79 }
  80
  81 size_t
  82 strxfrm(char *dst, const char *src, size_t n)
  83 {
  84         return strxfrm_l(dst, src, n, _current_locale());
  85 }