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Fix an off-by-one bug in the macros GALAXY_MAP_RIGHT and GALAXY_MAP_DOWN

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This bug has been present since commit e2dbe549b2
dated Sat Jul 16 13:34:13 2011 +1000: almost six years ago!
This commit is contained in:
John Zaitseff 2017-05-17 09:12:52 +10:00
parent 793ef176c9
commit e6493b4184
1 changed files with 4 additions and 4 deletions
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8
src/move.c
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@ -37,10 +37,10 @@
// Calculate positions near (x,y), taking the edge of the galaxy into account
#define GALAXY_MAP_LEFT(x, y) (((x) <= 0) ? MAP_EMPTY : galaxy_map[(x) - 1][(y)])
#define GALAXY_MAP_RIGHT(x, y) (((x) >= MAX_X) ? MAP_EMPTY : galaxy_map[(x) + 1][(y)])
#define GALAXY_MAP_UP(x, y) (((y) <= 0) ? MAP_EMPTY : galaxy_map[(x)][(y) - 1])
#define GALAXY_MAP_DOWN(x, y) (((y) >= MAX_Y) ? MAP_EMPTY : galaxy_map[(x)][(y) + 1])
#define GALAXY_MAP_LEFT(x, y) (((x) <= 0) ? MAP_EMPTY : galaxy_map[(x) - 1][(y)])
#define GALAXY_MAP_RIGHT(x, y) (((x) >= (MAX_X - 1)) ? MAP_EMPTY : galaxy_map[(x) + 1][(y)])
#define GALAXY_MAP_UP(x, y) (((y) <= 0) ? MAP_EMPTY : galaxy_map[(x)][(y) - 1])
#define GALAXY_MAP_DOWN(x, y) (((y) >= (MAX_Y - 1)) ? MAP_EMPTY : galaxy_map[(x)][(y) + 1])
#define assign_vals(x, y, left, right, up, down) \
do { \