string/FreeBSD/strcoll.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/strcoll.c,v 1.14 2009/02/03 17:58:20 danger Exp $");
  30
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include "collate.h"
  34
  35 int
  36 strcoll(const char *s, const char *s2)
  37 {
  38         int len, len2, prim, prim2, sec, sec2, ret, ret2;
  39         const char *t, *t2;
  40         char *tt, *tt2;
  41
  42         if (__collate_load_error)
  43                 return strcmp(s, s2);
  44
  45         len = len2 = 1;
  46         ret = ret2 = 0;
  47         if (__collate_substitute_nontrivial) {
  48                 t = tt = __collate_substitute(s);
  49                 t2 = tt2 = __collate_substitute(s2);
  50         } else {
  51                 tt = tt2 = NULL;
  52                 t = s;
  53                 t2 = s2;
  54         }
  55         while(*t && *t2) {
  56                 prim = prim2 = 0;
  57                 while(*t && !prim) {
  58                         __collate_lookup(t, &len, &prim, &sec);
  59                         t += len;
  60                 }
  61                 while(*t2 && !prim2) {
  62                         __collate_lookup(t2, &len2, &prim2, &sec2);
  63                         t2 += len2;
  64                 }
  65                 if(!prim || !prim2)
  66                         break;
  67                 if(prim != prim2) {
  68                         ret = prim - prim2;
  69                         goto end;
  70                 }
  71                 if(!ret2)
  72                         ret2 = sec - sec2;
  73         }
  74         if(!*t && *t2)
  75                 ret = -(int)((u_char)*t2);
  76         else if(*t && !*t2)
  77                 ret = (u_char)*t;
  78         else if(!*t && !*t2)
  79                 ret = ret2;
  80   end:
  81         free(tt);
  82         free(tt2);
  83
  84         return ret;
  85 }