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Repaired a comment and asserted a precondition.

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This commit is contained in:
Tim Peters 2000-10-12 19:42:00 +00:00
parent 20d529be26
commit 2bf405ad55
1 changed files with 2 additions and 1 deletions
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Modules/mathmodule.c
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@ -18,7 +18,7 @@ extern double modf (double, double *);
#endif #endif
/* RED_FLAG 12-Oct-2000 Tim /* RED_FLAG 12-Oct-2000 Tim
* What CHECK does if errno != 0 and x is a NaN is a platform-dependent crap * What CHECK does if errno == 0 and x is a NaN is a platform-dependent crap
* shoot. Most (but not all!) platforms will end up setting errno to ERANGE * shoot. Most (but not all!) platforms will end up setting errno to ERANGE
* then, but EDOM is probably better. * then, but EDOM is probably better.
*/ */
@ -38,6 +38,7 @@ static int
is_error(double x) is_error(double x)
{ {
int result = 1; /* presumption of guilt */ int result = 1; /* presumption of guilt */
assert(errno); /* non-zero errno is a precondition for calling */
if (errno == EDOM) if (errno == EDOM)
PyErr_SetString(PyExc_ValueError, "math domain error"); PyErr_SetString(PyExc_ValueError, "math domain error");
else if (errno == ERANGE) { else if (errno == ERANGE) {