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Explicitly check for weird values after calling pow().

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Guido van Rossum 1991-12-16 15:43:14 +00:00
parent fb905c3ebf
commit 7fa52f84c7
1 changed files with 9 additions and 0 deletions
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9
Objects/floatobject.c
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@ -37,6 +37,14 @@ extern int errno;
#include <ctype.h> #include <ctype.h>
#include <math.h> #include <math.h>
#ifdef HUGE_VAL
#define CHECK(x) if (errno != 0) ; \
else if (-HUGE_VAL <= (x) && (x) <= HUGE_VAL) ; \
else errno = ERANGE
#else
#define CHECK(x) /* Don't know how to check */
#endif
#ifndef THINK_C #ifndef THINK_C
extern double fmod PROTO((double, double)); extern double fmod PROTO((double, double));
extern double pow PROTO((double, double)); extern double pow PROTO((double, double));
@ -262,6 +270,7 @@ float_pow(v, w)
} }
errno = 0; errno = 0;
ix = pow(iv, iw); ix = pow(iv, iw);
CHECK(ix);
if (errno != 0) { if (errno != 0) {
/* XXX could it be another type of error? */ /* XXX could it be another type of error? */
err_errno(OverflowError); err_errno(OverflowError);