diff options
Diffstat (limited to 'FICS')
| -rw-r--r-- | FICS/ratings.c | 12 | ||||
| -rw-r--r-- | FICS/ratings.h | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/FICS/ratings.c b/FICS/ratings.c index 8fd683c..5f06ccc 100644 --- a/FICS/ratings.c +++ b/FICS/ratings.c @@ -1304,6 +1304,18 @@ com_statistics(int p, param_list param) return COM_OK; } +/* + * Return the difference of 'a - b' + */ +PUBLIC int +int_diff(const char *fn, const int a, const int b) +{ + if ((b > 0 && a < INT_MIN + b) || + (b < 0 && a > INT_MAX + b)) + errx(1, "%s: integer overflow (%d - %d)", fn, a, b); + return (a - b); +} + PUBLIC int com_fixrank(int p, param_list param) { diff --git a/FICS/ratings.h b/FICS/ratings.h index 4cf47a8..5461cd4 100644 --- a/FICS/ratings.h +++ b/FICS/ratings.h @@ -61,6 +61,7 @@ extern int com_hbest(int, param_list); extern int com_hrank(int, param_list); extern int com_rank(int, param_list); extern int com_statistics(int, param_list); +extern int int_diff(const char *, const int, const int); extern int is_active(int); extern int rating_delta(int, int, int, int, int); extern int rating_update(int); |