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Issue #7743: Add checks for zero inputs to the lshift and mult functions;

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this fixes the first bug described in issue #7743.
This commit is contained in:
Mark Dickinson 2010-01-23 20:48:56 +00:00
parent c64614e043
commit fc5290458d
1 changed files with 12 additions and 0 deletions
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12
Python/dtoa.c
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@ -622,6 +622,15 @@ mult(Bigint *a, Bigint *b)
ULong z2; ULong z2;
#endif #endif
if ((!a->x[0] && a->wds == 1) || (!b->x[0] && b->wds == 1)) {
c = Balloc(0);
if (c == NULL)
return NULL;
c->wds = 1;
c->x[0] = 0;
return c;
}
if (a->wds < b->wds) { if (a->wds < b->wds) {
c = a; c = a;
a = b; a = b;
@ -820,6 +829,9 @@ lshift(Bigint *b, int k)
Bigint *b1; Bigint *b1;
ULong *x, *x1, *xe, z; ULong *x, *x1, *xe, z;
if (!k || (!b->x[0] && b->wds == 1))
return b;
n = k >> 5; n = k >> 5;
k1 = b->k; k1 = b->k;
n1 = n + b->wds + 1; n1 = n + b->wds + 1;