locale/FreeBSD/tolower.c

   1 /*-
   2  * Copyright (c) 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Paul Borman at Krystal Technologies.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/locale/tolower.c,v 1.13 2007/01/09 00:28:01 imp Exp $");
  35
  36 #include "xlocale_private.h"
  37
  38 #include <ctype.h>
  39 #include <stdio.h>
  40 #include <runetype.h>
  41
  42 __ct_rune_t
  43 ___tolower_l(c, loc)
  44         __ct_rune_t c;
  45         locale_t loc;
  46 {
  47         size_t lim;
  48         _RuneRange *rr;
  49         _RuneEntry *base, *re;
  50
  51         if (c < 0 || c == EOF)
  52                 return(c);
  53
  54         NORMALIZE_LOCALE(loc);
  55         /*
  56          * the following is not used by tolower(), but can be used by
  57          * tolower_l().  This provides the oppurtunity to optimize tolower()
  58          * when compatibility for Panther and lower is no longer needed
  59          */
  60         if (c < _CACHED_RUNES)
  61                 return loc->__lc_ctype->_CurrentRuneLocale.__maplower[c];
  62         rr = &loc->__lc_ctype->_CurrentRuneLocale.__maplower_ext;
  63         /* Binary search -- see bsearch.c for explanation. */
  64         base = rr->__ranges;
  65         for (lim = rr->__nranges; lim != 0; lim >>= 1) {
  66                 re = base + (lim >> 1);
  67                 if (re->__min <= c && c <= re->__max)
  68                         return (re->__map + c - re->__min);
  69                 else if (c > re->__max) {
  70                         base = re + 1;
  71                         lim--;
  72                 }
  73         }
  74
  75         return(c);
  76 }
  77
  78 __ct_rune_t
  79 ___tolower(c)
  80         __ct_rune_t c;
  81 {
  82         return ___tolower_l(c, __current_locale());
  83 }