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Assert on rand_s failure in rand_r #3

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7 changes: 4 additions & 3 deletions link-grammar/utilities.c
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Original file line number Diff line number Diff line change
Expand Up @@ -228,14 +228,15 @@ size_t lg_mbrtowc(wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
* Emulate rand_r() using rand_s() in a way that is enough for our needs.
* Windows doesn't have rand_r(), and its rand_s() is different: It
* returns an error indication and not the random number like rand_r().
* The value it returns is through its argument.
* The value it returns is through its argument. Failure is fatal and
* triggers an assert.
*
* Note that "#define _CRT_RAND_S" is needed before "#include <stdlib.h>".
*/
int rand_r(unsigned int *s)
{
rand_s(s);
if (*s > INT_MAX) *s -= INT_MAX;
assert(0 == rand_s(s), "rand_s() failed");
if (*s > INT_MAX) *s -= INT_MAX;

return *s;
}
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