mdw@git.distorted.org.uk Git - disorder/blob - lib/table.c

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2004, 2007, 2008 Richard Kettlewell
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * 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
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file lib/table.c
  19  * @brief Generic binary search
  20  */
  21 #include "common.h"
  22
  23 #include "table.h"
  24
  25 int table_find(const void *table, size_t offset, size_t eltsize, size_t nelts,
  26                const char *name) {
  27   int l = 0, r = (int)nelts - 1, c, m;
  28   const char *k;
  29
  30   while(l <= r) {
  31     k = *(const char **)((char *)table + offset + eltsize * (m = (l + r) / 2));
  32     if(!(c = strcmp(name, k)))
  33       return m;
  34     if(c < 0)
  35       r = m - 1;
  36     else
  37       l = m + 1;
  38   }
  39   return -1;
  40 }
  41
  42 /*
  43 Local Variables:
  44 c-basic-offset:2
  45 comment-column:40
  46 End:
  47 */