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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
View file

@ -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

14
src/lib/common/pathfind.c
View file

@ -27,7 +27,7 @@
* pathfind.c: Find cheapest paths
*
* Known contributors to this file:
* Markus Armbruster, 2011
* Markus Armbruster, 2014
*/
#include <config.h>
@ -325,13 +325,6 @@ y_in_dir(coord y, int dir)
return yy;
}
static int
rev_dir(int dir)
{
assert(DIR_FIRST <= dir && dir <= DIR_LAST);
return dir >= DIR_FIRST + 3 ? dir - 3 : dir + 3;
}
/*
* Set the current source and cost function.
* SX,SY is the source.
@ -456,8 +449,9 @@ path_find_route(char *buf, size_t bufsz,
i = bufsz;
buf[--i] = dirch[d];
len++;
x = x_in_dir(x, rev_dir(d));
y = y_in_dir(y, rev_dir(d));
assert(DIR_FIRST <= d && d <= DIR_LAST);
x = x_in_dir(x, DIR_BACK(d));
y = y_in_dir(y, DIR_BACK(d));
}
assert(x == sx && y == sy);