lib/unictype/joininggroup_byname.c

   1 /* Arabic joining group of Unicode characters.
   2    Copyright (C) 2011-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2011.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "unictype.h"
  22
  23 #include <string.h>
  24
  25 #include "unictype/joininggroup_byname.h"
  26
  27 int
  28 uc_joining_group_byname (const char *joining_group_name)
  29 {
  30   size_t len;
  31
  32   len = strlen (joining_group_name);
  33   if (len <= MAX_WORD_LENGTH)
  34     {
  35       char buf[MAX_WORD_LENGTH + 1];
  36       const struct named_joining_group *found;
  37
  38       /* Copy joining_group_name into buf, converting '_' and '-' to ' '.  */
  39       {
  40         const char *p = joining_group_name;
  41         char *q = buf;
  42
  43         for (;; p++, q++)
  44           {
  45             char c = *p;
  46
  47             if (c == '_' || c == '-')
  48               c = ' ';
  49             *q = c;
  50             if (c == '\0')
  51               break;
  52           }
  53       }
  54       /* Here q == buf + len.  */
  55
  56       /* Do a hash table lookup, with case-insensitive comparison.  */
  57       found = uc_joining_group_lookup (buf, len);
  58       if (found != NULL)
  59         return found->joining_group;
  60     }
  61   /* Invalid joining group name.  */
  62   return -1;
  63 }