1 /*
   2  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
   3  * Copyright (c) 1989, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  * (c) UNIX System Laboratories, Inc.
   6  * All or some portions of this file are derived from material licensed
   7  * to the University of California by American Telephone and Telegraph
   8  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   9  * the permission of UNIX System Laboratories, Inc.
  10  *
  11  * This code is derived from software contributed to Berkeley by
  12  * Paul Borman at Krystal Technologies.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  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 "lint.h"
  40 #include <wctype.h>
  41 #include <stdio.h>
  42 #include "runetype.h"
  43 
  44 static wint_t
  45 __change_case_ext(wint_t c, int lower)
  46 {
  47         size_t lim;
  48         _RuneRange *rr;
  49         _RuneEntry *base, *re;
  50 
  51         if (c < 0 || c == EOF)
  52                 return (c);
  53 
  54         rr = lower ?
  55             &_CurrentRuneLocale->__maplower_ext :
  56             &_CurrentRuneLocale->__mapupper_ext;
  57         /* Binary search -- see bsearch.c for explanation. */
  58         base = rr->__ranges;
  59         for (lim = rr->__nranges; lim != 0; lim >>= 1) {
  60                 re = base + (lim >> 1);
  61                 if (re->__min <= c && c <= re->__max) {
  62                         return (re->__map + c - re->__min);
  63                 } else if (c > re->__max) {
  64                         base = re + 1;
  65                         lim--;
  66                 }
  67         }
  68 
  69         return (c);
  70 }
  71 
  72 #undef towlower
  73 wint_t
  74 towlower(wint_t wc)
  75 {
  76         return ((wc < 0 || wc >= _CACHED_RUNES) ?
  77             __change_case_ext(wc, 1) :
  78             _CurrentRuneLocale->__maplower[wc]);
  79 }
  80 
  81 #undef towupper
  82 wint_t
  83 towupper(wint_t wc)
  84 {
  85         return ((wc < 0 || wc >= _CACHED_RUNES) ?
  86             __change_case_ext(wc, 0) :
  87             _CurrentRuneLocale->__mapupper[wc]);
  88 }