string/FreeBSD/strxfrm.c

   1 /*-
   2  * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
   3  *              at Electronni Visti IA, Kiev, Ukraine.
   4  *                      All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD: src/lib/libc/string/strxfrm.c,v 1.15 2002/09/06 11:24:06 tjr Exp $");
  30
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include "collate.h"
  34
  35 size_t
  36 strxfrm(char * __restrict dest, const char * __restrict src, size_t len)
  37 {
  38         int prim, sec, l;
  39         size_t slen;
  40         char *s, *ss;
  41
  42         if (!*src) {
  43                 if (len > 0)
  44                         *dest = '\0';
  45                 return 0;
  46         }
  47
  48         if (__collate_load_error) {
  49                 slen = strlen(src);
  50                 if (len > 0) {
  51                         if (slen < len)
  52                                 strcpy(dest, src);
  53                         else {
  54                                 strncpy(dest, src, len - 1);
  55                                 dest[len - 1] = '\0';
  56                         }
  57                 }
  58                 return slen;
  59         }
  60
  61         slen = 0;
  62         prim = sec = 0;
  63         ss = s = __collate_substitute(src);
  64         while (*s) {
  65                 while (*s && !prim) {
  66                         __collate_lookup(s, &l, &prim, &sec);
  67                         s += l;
  68                 }
  69                 if (prim) {
  70                         if (len > 1) {
  71                                 *dest++ = (char)prim;
  72                                 len--;
  73                         }
  74                         slen++;
  75                         prim = 0;
  76                 }
  77         }
  78         free(ss);
  79         if (len > 0)
  80                 *dest = '\0';
  81
  82         return slen;
  83 }