locale/FreeBSD/nextwctype.c

   1 /*-
   2  * Copyright (c) 2004 Tim J. Robbins.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: src/lib/libc/locale/nextwctype.c,v 1.1 2004/07/08 06:43:37 tjr Exp $");
  29
  30 #include <runetype.h>
  31 #include <wchar.h>
  32 #include <wctype.h>
  33
  34 wint_t
  35 nextwctype(wint_t wc, wctype_t wct)
  36 {
  37         size_t lim;
  38         _RuneRange *rr = &_CurrentRuneLocale->__runetype_ext;
  39         _RuneEntry *base, *re;
  40         int noinc;
  41
  42         noinc = 0;
  43         if (wc < _CACHED_RUNES) {
  44                 wc++;
  45                 while (wc < _CACHED_RUNES) {
  46                         if (_CurrentRuneLocale->__runetype[wc] & wct)
  47                                 return (wc);
  48                         wc++;
  49                 }
  50                 wc--;
  51         }
  52         if (rr->__ranges != NULL && wc < rr->__ranges[0].__min) {
  53                 wc = rr->__ranges[0].__min;
  54                 noinc = 1;
  55         }
  56
  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 <= wc && wc <= re->__max)
  62                         goto found;
  63                 else if (wc > re->__max) {
  64                         base = re + 1;
  65                         lim--;
  66                 }
  67         }
  68         return (-1);
  69 found:
  70         if (!noinc)
  71                 wc++;
  72         if (re->__min <= wc && wc <= re->__max) {
  73                 if (re->__types != NULL) {
  74                         for (; wc <= re->__max; wc++)
  75                                 if (re->__types[wc - re->__min] & wct)
  76                                         return (wc);
  77                 } else if (re->__map & wct)
  78                         return (wc);
  79         }
  80         while (++re < rr->__ranges + rr->__nranges) {
  81                 wc = re->__min;
  82                 if (re->__types != NULL) {
  83                         for (; wc <= re->__max; wc++)
  84                                 if (re->__types[wc - re->__min] & wct)
  85                                         return (wc);
  86                 } else if (re->__map & wct)
  87                         return (wc);
  88         }
  89         return (-1);
  90 }