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strxfrm.c revision 1.13 
      1 /*	$NetBSD: strxfrm.c,v 1.13 2013/04/19 23:28:47 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 1.13 2013/04/19 23:28:47 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 	if (loc == NULL)
     66 		loc = _C_locale;
     67 	/* XXX: LC_COLLATE should be implemented. */
     68 	/* LINTED */(void)loc;
     69 
     70 	/*
     71 	 * Since locales are unimplemented, this is just a copy.
     72 	 */
     73 	srclen = strlen(src);
     74 	if (n != 0) {
     75 		_DIAGASSERT(dst != NULL);
     76 		copysize = srclen < n ? srclen : n - 1;
     77 		(void)memcpy(dst, src, copysize);
     78 		dst[copysize] = 0;
     79 	}
     80 	return (srclen);
     81 }
     82 
     83 size_t
     84 strxfrm(char *dst, const char *src, size_t n)
     85 {
     86 	return strxfrm_l(dst, src, n, *_current_locale());
     87 }
     88