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strxfrm.c revision 1.5 
      1 /*	$NetBSD: strxfrm.c,v 1.5 1997/07/13 20:24:37 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 #if 0
     42 static char *sccsid = "@(#)strxfrm.c	5.2 (Berkeley) 1/26/91";
     43 #else
     44 __RCSID("$NetBSD: strxfrm.c,v 1.5 1997/07/13 20:24:37 christos Exp $");
     45 #endif
     46 #endif /* LIBC_SCCS and not lint */
     47 
     48 #include <string.h>
     49 
     50 /*
     51  * Transform src, storing the result in dst, such that
     52  * strcmp() on transformed strings returns what strcoll()
     53  * on the original untransformed strings would return.
     54  */
     55 size_t
     56 strxfrm(dst, src, n)
     57 	register char *dst;
     58 	register const char *src;
     59 	register size_t n;
     60 {
     61 	register size_t r = 0;
     62 	register int c;
     63 
     64 	/*
     65 	 * Since locales are unimplemented, this is just a copy.
     66 	 */
     67 	if (n != 0) {
     68 		while ((c = *src++) != 0) {
     69 			r++;
     70 			if (--n == 0) {
     71 				while (*src++ != 0)
     72 					r++;
     73 				break;
     74 			}
     75 			*dst++ = c;
     76 		}
     77 		*dst = 0;
     78 	}
     79 	return (r);
     80 }
     81