diff options
Diffstat (limited to 'missing')
| -rw-r--r-- | missing/acosh.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/missing/acosh.c b/missing/acosh.c index 41add2e4b6..c6695b599e 100644 --- a/missing/acosh.c +++ b/missing/acosh.c @@ -12,6 +12,7 @@ #include <errno.h> #include <float.h> #include <math.h> +#include "ruby.h" /* DBL_MANT_DIG must be less than 4 times of bits of int */ #ifndef DBL_MANT_DIG @@ -79,6 +80,14 @@ atanh(double x) if (z < SMALL_CRITERIA) return x; z = log(z > 1 ? -1 : (1 + z) / (1 - z)) / 2; if (neg) z = -z; + if (isinf(z)) +#if defined(ERANGE) + errno = ERANGE; +#elif defined(EDOM) + errno = EDOM; +#else + ; +#endif return z; } #endif |