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strxfrm.c revision 1.11 
      1 /*	$NetBSD: strxfrm.c,v 1.11 2003/08/07 16:43:53 agc 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 1.11 2003/08/07 16:43:53 agc Exp $");
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <assert.h>
     45 #include <string.h>
     46 
     47 /*
     48  * Transform src, storing the result in dst, such that
     49  * strcmp() on transformed strings returns what strcoll()
     50  * on the original untransformed strings would return.
     51  */
     52 size_t
     53 strxfrm(dst, src, n)
     54 	char *dst;
     55 	const char *src;
     56 	size_t n;
     57 {
     58 	size_t srclen, copysize;
     59 
     60 	_DIAGASSERT(src != NULL);
     61 
     62 	/*
     63 	 * Since locales are unimplemented, this is just a copy.
     64 	 */
     65 	srclen = strlen(src);
     66 	if (n != 0) {
     67 		_DIAGASSERT(dst != NULL);
     68 		copysize = srclen < n ? srclen : n - 1;
     69 		(void)memcpy(dst, src, copysize);
     70 		dst[copysize] = 0;
     71 	}
     72 	return (srclen);
     73 }
     74