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 "xlocale_private.h"
  31
  32 #include <runetype.h>
  33 #include <wchar.h>
  34 #include <wctype.h>
  35
  36 wint_t
  37 nextwctype_l(wint_t wc, wctype_t wct, locale_t loc)
  38 {
  39         size_t lim;
  40         _RuneRange *rr;
  41         _RuneEntry *base, *re;
  42         int noinc;
  43         _RuneLocale *rl = &loc->__lc_ctype->_CurrentRuneLocale;
  44
  45         noinc = 0;
  46         if (wc < _CACHED_RUNES) {
  47                 wc++;
  48                 while (wc < _CACHED_RUNES) {
  49                         if (rl->__runetype[wc] & wct)
  50                                 return (wc);
  51                         wc++;
  52                 }
  53                 wc--;
  54         }
  55         rr = &rl->__runetype_ext;
  56         if (rr->__ranges != NULL && wc < rr->__ranges[0].__min) {
  57                 wc = rr->__ranges[0].__min;
  58                 noinc = 1;
  59         }
  60
  61         /* Binary search -- see bsearch.c for explanation. */
  62         base = rr->__ranges;
  63         for (lim = rr->__nranges; lim != 0; lim >>= 1) {
  64                 re = base + (lim >> 1);
  65                 if (re->__min <= wc && wc <= re->__max)
  66                         goto found;
  67                 else if (wc > re->__max) {
  68                         base = re + 1;
  69                         lim--;
  70                 }
  71         }
  72         return (-1);
  73 found:
  74         if (!noinc)
  75                 wc++;
  76         if (re->__min <= wc && wc <= re->__max) {
  77                 if (re->__types != NULL) {
  78                         for (; wc <= re->__max; wc++)
  79                                 if (re->__types[wc - re->__min] & wct)
  80                                         return (wc);
  81                 } else if (re->__map & wct)
  82                         return (wc);
  83         }
  84         while (++re < rr->__ranges + rr->__nranges) {
  85                 wc = re->__min;
  86                 if (re->__types != NULL) {
  87                         for (; wc <= re->__max; wc++)
  88                                 if (re->__types[wc - re->__min] & wct)
  89                                         return (wc);
  90                 } else if (re->__map & wct)
  91                         return (wc);
  92         }
  93         return (-1);
  94 }
  95
  96 wint_t
  97 nextwctype(wint_t wc, wctype_t wct)
  98 {
  99         return nextwctype_l(wc, wct, __current_locale());
 100 }