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Fix an underlying bug. flodivmod() will be crashed in case ((y == 0) && ((divp == NULL) || (modp == NULL))).

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This commit is contained in:
Masaki Muranaka
2013-02-23 10:47:13 +09:00
parent 82313b6ec7
commit 9ea0b4b7d1
1 changed files with 15 additions and 12 deletions
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src/numeric.c
+15 -12
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@@ -244,22 +244,25 @@ flo_mul(mrb_state *mrb, mrb_value x)
static void
flodivmod(mrb_state *mrb, mrb_float x, mrb_float y, mrb_float *divp, mrb_float *modp)
{
mrb_float div, mod;
mrb_float div;
mrb_float mod;
if (y == 0.0) {
*divp = str_to_mrb_float("inf");
*modp = str_to_mrb_float("nan");
return;
div = str_to_mrb_float("inf");
mod = str_to_mrb_float("nan");
}
mod = fmod(x, y);
if (isinf(x) && !isinf(y) && !isnan(y))
div = x;
else
div = (x - mod) / y;
if (y*mod < 0) {
mod += y;
div -= 1.0;
else {
mod = fmod(x, y);
if (isinf(x) && !isinf(y) && !isnan(y))
div = x;
else
div = (x - mod) / y;
if (y*mod < 0) {
mod += y;
div -= 1.0;
}
}
if (modp) *modp = mod;
if (divp) *divp = div;
}