lib/wind/bidi.c

   1 /*
   2  * Copyright (c) 2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  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  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "windlocl.h"
  35
  36 #include <stdlib.h>
  37
  38 #include "bidi_table.h"
  39
  40 static int
  41 range_entry_cmp(const void *a, const void *b)
  42 {
  43     const struct range_entry *ea = (const struct range_entry*)a;
  44     const struct range_entry *eb = (const struct range_entry*)b;
  45
  46     if (ea->start >= eb->start && ea->start < eb->start + eb->len)
  47         return 0;
  48     return ea->start - eb->start;
  49 }
  50
  51 static int
  52 is_ral(uint32_t cp)
  53 {
  54     struct range_entry ee = {cp, 0};
  55     void *s = bsearch(&ee, _wind_ral_table, _wind_ral_table_size,
  56                       sizeof(_wind_ral_table[0]),
  57                       range_entry_cmp);
  58     return s != NULL;
  59 }
  60
  61 static int
  62 is_l(uint32_t cp)
  63 {
  64     struct range_entry ee = {cp, 0};
  65     void *s = bsearch(&ee, _wind_l_table, _wind_l_table_size,
  66                       sizeof(_wind_l_table[0]),
  67                       range_entry_cmp);
  68     return s != NULL;
  69 }
  70
  71 int
  72 _wind_stringprep_testbidi(const uint32_t *in, size_t in_len, wind_profile_flags flags)
  73 {
  74     size_t i;
  75     unsigned ral = 0;
  76     unsigned l   = 0;
  77
  78     if ((flags & (WIND_PROFILE_NAME|WIND_PROFILE_SASL)) == 0)
  79         return 0;
  80
  81     for (i = 0; i < in_len; ++i) {
  82         ral |= is_ral(in[i]);
  83         l   |= is_l(in[i]);
  84     }
  85     if (ral) {
  86         if (l)
  87             return 1;
  88         if (!is_ral(in[0]) || !is_ral(in[in_len - 1]))
  89             return 1;
  90     }
  91     return 0;
  92 }