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libc: Prevent infinite recursion when modf is called with NaN or Inf argument. (apply richard millers / modf-nan patch from sources)

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This commit is contained in:
cinap_lenrek 2013-08-14 18:49:45 +02:00
parent 508b53a29a
commit c23a2f6a79
1 changed files with 11 additions and 2 deletions
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13
sys/src/libc/port/frexp.c
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@ -89,6 +89,16 @@ modf(double d, double *ip)
FPdbleword x;
int e;
x.x = d;
e = (x.hi >> SHIFT) & MASK;
if(e == MASK){
*ip = d;
if(x.lo != 0 || (x.hi & 0xfffffL != 0)) /* NaN */
return d;
/* ±Inf */
x.hi &= 0x80000000L;
return x.x;
}
if(d < 1) {
if(d < 0) {
x.x = modf(-d, ip);
@ -98,8 +108,7 @@ modf(double d, double *ip)
*ip = 0;
return d;
}
x.x = d;
e = ((x.hi >> SHIFT) & MASK) - BIAS;
e -= BIAS;
if(e <= SHIFT+1) {
x.hi &= ~(0x1fffffL >> e);
x.lo = 0;