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| author | Ben Longbons <b.r.longbons@gmail.com> | 2011-09-30 23:53:23 -0700 |
|---|---|---|
| committer | Ben Longbons <b.r.longbons@gmail.com> | 2011-10-01 00:27:37 -0700 |
| commit | d5cdae1592522e330bac0e197a449d8328c1d5dc (patch) | |
| tree | 9094e556d00665b564687c37609b987cc23744ba | |
| parent | 840420f4014e03318d4258f934110ddb11c11942 (diff) | |
| download | tmwa-d5cdae1592522e330bac0e197a449d8328c1d5dc.tar.gz tmwa-d5cdae1592522e330bac0e197a449d8328c1d5dc.tar.bz2 tmwa-d5cdae1592522e330bac0e197a449d8328c1d5dc.tar.xz tmwa-d5cdae1592522e330bac0e197a449d8328c1d5dc.zip | |
Fix negative chances wrapping to high (Another bug in the language)
| -rw-r--r-- | src/common/mt_rand.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/common/mt_rand.h b/src/common/mt_rand.h index 95f30e5..84d32e5 100644 --- a/src/common/mt_rand.h +++ b/src/common/mt_rand.h @@ -15,7 +15,10 @@ uint32_t mt_random (void); * MRAND(10) returns 0..9 * MPRAND(5,10) returns 5..14 */ -# define MRAND(mod) (mt_random() % (mod)) +// The cast is essential because the result is sometimes +// compared with a possibly negative number. +// Because it's using modulus, high numbers shouldn't happen anyway. +# define MRAND(mod) ((int)(mt_random() % (mod))) # define MPRAND(add, mod) ((add) + MRAND(mod)) #endif // MT_RAND_H |