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| author | Eric Blake <ebb9@byu.net> | 2007-04-03 21:06:16 +0000 |
|---|---|---|
| committer | Eric Blake <ebb9@byu.net> | 2007-10-06 07:08:21 -0600 |
| commit | 0272fa99f3cfa800daa5b8a8222611ad8d315937 (patch) | |
| tree | b3c4b421967663f188146d7b7e40d690350ea92b /modules/m4.c | |
| parent | 8b29cfdba57ed8308fcf6cebe8fafffe5f483d9d (diff) | |
| download | m4-0272fa99f3cfa800daa5b8a8222611ad8d315937.tar.gz | |
* modules/m4.c (numb_ratio, numb_divide, numb_modulo): Avoid
SIGFPE on x86 architectures.
Reported by Ralf Wildenhues.
Diffstat (limited to 'modules/m4.c')
| -rw-r--r-- | modules/m4.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/modules/m4.c b/modules/m4.c index c190240e..1cec2953 100644 --- a/modules/m4.c +++ b/modules/m4.c @@ -1095,9 +1095,13 @@ M4BUILTIN_HANDLER (translit) #define numb_negate(x) ((x) = (- (x))) #define numb_times(x, y) ((x) = ((x) * (y))) -#define numb_ratio(x, y) ((x) = ((x) / ((y)))) -#define numb_divide(x, y) (*(x) = (*(x) / (*(y)))) -#define numb_modulo(c, x, y) (*(x) = (*(x) % *(y))) +/* Be careful of x86 SIGFPE. */ +#define numb_ratio(x, y) \ + (((y) == -1) ? (numb_negate (x)) : ((x) /= (y))) +#define numb_divide(x, y) \ + ((*(y) == -1) ? (numb_negate (*(y))) : (*(x) /= *(y))) +#define numb_modulo(c, x, y) \ + ((*(y) == -1) ? (*(x) = numb_ZERO) : (*(x) %= *(y))) /* numb_invert is only used in the context of x**-y, which integral math does not support. */ #define numb_invert(x) return NEGATIVE_EXPONENT |