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path: New DIR_BACK()

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Actually pathfind.c's rev_dir() turned into a macro, to make it
available elsewhere.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
This commit is contained in:
Markus Armbruster 2014-01-17 18:49:48 +01:00
parent 21b8add73e
commit 296f3272e2
2 changed files with 7 additions and 11 deletions
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4
include/path.h
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@ -27,7 +27,7 @@
* path.h: Definitions for directions, paths, etc.
*
* Known contributors to this file:
* Markus Armbruster, 2005-2011
* Markus Armbruster, 2005-2014
*/
#ifndef PATH_H
@ -49,6 +49,8 @@
#define DIR_FIRST 1
#define DIR_LAST 6
#define DIR_BACK(dir) ((dir) >= DIR_FIRST + 3 ? (dir) - 3 : (dir) + 3)
#define MOB_MOVE 0
#define MOB_MARCH 1
#define MOB_RAIL 2