usr/src/lib/libc/port/locale/runetype.c

   1 /*
   2  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
   3  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
   4  * Copyright (c) 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Paul Borman at Krystal Technologies.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 4. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "lint.h"
  36 #include <ctype.h>
  37 #include <stdio.h>
  38 #include "runetype.h"
  39
  40 unsigned int
  41 __runetype(const _RuneLocale *rl, __ct_rune_t c)
  42 {
  43         size_t lim;
  44         const _RuneRange *rr = &rl->__runetype_ext;
  45         const _RuneEntry *base, *re;
  46
  47         if (c < 0 || c == EOF)
  48                 return (0L);
  49
  50         /* Binary search -- see bsearch.c for explanation. */
  51         base = rr->__ranges;
  52         for (lim = rr->__nranges; lim != 0; lim >>= 1) {
  53                 re = base + (lim >> 1);
  54                 if (re->__min <= c && c <= re->__max) {
  55                         if (re->__types)
  56                                 return (re->__types[c - re->__min]);
  57                         else
  58                                 return (re->__map);
  59                 } else if (c > re->__max) {
  60                         base = re + 1;
  61                         lim--;
  62                 }
  63         }
  64
  65         return (0L);
  66 }