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catch invalid ld80 bit patterns and treat them as nan

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this should not be necessary - the invalid bit patterns cannot be
created except through type punning. however, some broken gnu software
is passing them to printf and triggering dangerous stack-smashing, so
let's catch them anyway...
This commit is contained in:
Rich Felker 2011-06-30 16:31:43 -04:00
parent e5cb55fedd
commit f6fd351c70
1 changed files with 2 additions and 2 deletions
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4
src/math/__fpclassifyl.c
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@ -7,10 +7,10 @@ int __fpclassifyl(long double __x)
union { union {
long double __ld; long double __ld;
__uint16_t __hw[5]; __uint16_t __hw[5];
__uint64_t __m; __int64_t __m;
} __y = { __x }; } __y = { __x };
int __ee = __y.__hw[4]&0x7fff; int __ee = __y.__hw[4]&0x7fff;
if (!__ee) return __y.__m ? FP_SUBNORMAL : FP_ZERO; if (!__ee) return __y.__m ? FP_SUBNORMAL : FP_ZERO;
if (__ee==0x7fff) return __y.__m ? FP_NAN : FP_INFINITE; if (__ee==0x7fff) return __y.__m ? FP_NAN : FP_INFINITE;
return FP_NORMAL; return __y.__m < 0 ? FP_NORMAL : FP_NAN;
} }