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

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2004, 2005, 2007, 2008, 2013 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.h
  19  * @brief Generic binary search
  20  */
  21 #ifndef TABLE_H
  22 #define TABLE_H
  23
  24 #include <stddef.h>
  25
  26 #if _WIN32
  27 #define OFFSETOF_IN_OBJECT(OBJECT,FIELD) ((char *)&(OBJECT).FIELD - (char *)&(OBJECT))
  28 #else
  29 #define OFFSETOF_IN_OBJECT(OBJECT,FIELD) offsetof(typeof(OBJECT),FIELD)
  30 #endif
  31
  32 #define TABLE_FIND(TABLE, FIELD, NAME)                  \
  33   table_find((void *)TABLE,                             \
  34              OFFSETOF_IN_OBJECT(TABLE[0], FIELD),       \
  35              sizeof ((TABLE)[0]),                       \
  36              sizeof TABLE / sizeof ((TABLE)[0]),        \
  37              NAME)
  38 /* Search TABLE[] for an element where TABLE[N].FIELD matches NAME
  39  * Returns the index N on success or -1 if not found
  40  * The table must be lexically sorted on FIELD
  41  */
  42
  43 int table_find(const void *table, size_t offset, size_t eltsize, size_t nelts,
  44                const char *name);
  45
  46 #endif /* TABLE_H */
  47
  48 /*
  49 Local Variables:
  50 c-basic-offset:2
  51 comment-column:40
  52 End:
  53 */