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FreeBSD/Linux Kernel Cross Reference
sys/locale/tolower.c

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    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  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: stable/6/lib/libc/locale/tolower.c 132820 2004-07-29 06:16:19Z tjr $");
   39 
   40 #include <stdio.h>
   41 #include <runetype.h>
   42 
   43 __ct_rune_t
   44 ___tolower(c)
   45         __ct_rune_t c;
   46 {
   47         size_t lim;
   48         _RuneRange *rr = &_CurrentRuneLocale->__maplower_ext;
   49         _RuneEntry *base, *re;
   50 
   51         if (c < 0 || c == EOF)
   52                 return(c);
   53 
   54         /* Binary search -- see bsearch.c for explanation. */
   55         base = rr->__ranges;
   56         for (lim = rr->__nranges; lim != 0; lim >>= 1) {
   57                 re = base + (lim >> 1);
   58                 if (re->__min <= c && c <= re->__max)
   59                         return (re->__map + c - re->__min);
   60                 else if (c > re->__max) {
   61                         base = re + 1;
   62                         lim--;
   63                 }
   64         }
   65 
   66         return(c);
   67 }

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