diff options
Diffstat (limited to 'random.c')
| -rw-r--r-- | random.c | 10 |
1 files changed, 7 insertions, 3 deletions
@@ -760,10 +760,11 @@ make_mask(unsigned long x) static unsigned long limited_rand(struct MT *mt, unsigned long limit) { - unsigned long mask = make_mask(limit); int i; - unsigned long val; + unsigned long val, mask; + if (!limit) return 0; + mask = make_mask(limit); retry: val = 0; for (i = SIZEOF_LONG/SIZEOF_INT32-1; 0 <= i; i--) { @@ -1016,7 +1017,7 @@ random_rand(int argc, VALUE *argv, VALUE obj) v = Qnil; if (FIXNUM_P(vmax)) { fixnum: - if ((max = FIX2LONG(vmax) - excl) > 0) { + if ((max = FIX2LONG(vmax) - excl) >= 0) { unsigned long r = limited_rand(&rnd->mt, (unsigned long)max); v = ULONG2NUM(r); } @@ -1042,6 +1043,9 @@ random_rand(int argc, VALUE *argv, VALUE obj) } v = rb_float_new(r * max); } + else if (max == 0.0 && !excl) { + v = rb_float_new(0.0); + } } } else { |