mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-12-04 16:43:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 10

Fix core dump from pow(x,y,0).

Browse source 
Make gcc -Wall happy.
This commit is contained in:
Guido van Rossum 1996-12-06 20:14:43 +00:00
parent d560605ae6
commit 9478dd40c2
1 changed files with 9 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

16
Objects/intobject.c
View file

@ -342,7 +342,7 @@ int_mul(v, w)
b = -b; b = -b;
if (b < 0) { if (b < 0) {
/* Largest negative */ /* Largest negative */
if (a == 0 || a == 1 && s == 1) { if (a == 0 || (a == 1 && s == 1)) {
x = a*b; x = a*b;
goto ok; goto ok;
} }
@ -427,7 +427,7 @@ i_divmod(x, y, p_xdivy, p_xmody)
xdivy = xi / yi; xdivy = xi / yi;
} }
xmody = xi - xdivy*yi; xmody = xi - xdivy*yi;
if (xmody < 0 && yi > 0 || xmody > 0 && yi < 0) { if ((xmody < 0 && yi > 0) || (xmody > 0 && yi < 0)) {
xmody += yi; xmody += yi;
xdivy -= 1; xdivy -= 1;
} }
@ -476,8 +476,7 @@ int_pow(v, w, z)
intobject *z; intobject *z;
{ {
#if 1 #if 1
register long iv, iw, iz, ix, temp, prev; register long iv, iw, iz=0, ix, temp, prev;
int zset = 0;
iv = v->ob_ival; iv = v->ob_ival;
iw = w->ob_ival; iw = w->ob_ival;
if (iw < 0) { if (iw < 0) {
@ -486,7 +485,10 @@ int_pow(v, w, z)
} }
if ((object *)z != None) { if ((object *)z != None) {
iz = z->ob_ival; iz = z->ob_ival;
zset = 1; if (iz == 0) {
err_setstr(ValueError, "pow(x, y, z) with z==0");
return NULL;
}
} }
/* /*
* XXX: The original exponentiation code stopped looping * XXX: The original exponentiation code stopped looping
@ -513,13 +515,13 @@ int_pow(v, w, z)
temp *= temp; /* Square the value of temp */ temp *= temp; /* Square the value of temp */
if (prev!=0 && temp/prev!=prev) if (prev!=0 && temp/prev!=prev)
return err_ovf("integer pow()"); return err_ovf("integer pow()");
if (zset) { if (iz) {
/* If we did a multiplication, perform a modulo */ /* If we did a multiplication, perform a modulo */
ix = ix % iz; ix = ix % iz;
temp = temp % iz; temp = temp % iz;
} }
} }
if (zset) { if (iz) {
object *t1, *t2; object *t1, *t2;
long int div, mod; long int div, mod;
t1=newintobject(ix); t1=newintobject(ix);