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author | matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 1999-08-13 05:45:20 +0000 |
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committer | matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 1999-08-13 05:45:20 +0000 |
commit | 65a5162550f58047974793cdc8067a970b2435c0 (patch) | |
tree | 082bb7d5568f3b2e36e3fe166e9f3039394fcf44 /missing/isinf.c | |
parent | fcd020c83028f5610d382e85a2df00223e12bd7e (diff) | |
download | ruby-65a5162550f58047974793cdc8067a970b2435c0.tar.gz |
1.4.0
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'missing/isinf.c')
-rw-r--r-- | missing/isinf.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/missing/isinf.c b/missing/isinf.c new file mode 100644 index 0000000000..e0cd6ac1a2 --- /dev/null +++ b/missing/isinf.c @@ -0,0 +1,44 @@ +#ifdef __osf__ + +#define _IEEE 1 +#include <nan.h> + +int +isinf(n) + double n; +{ + if (IsNANorINF(n) && IsINF(n)) { + return 1; + } else { + return 0; + } +} + +#else + +#include "config.h" +#ifdef HAVE_STRING_H +# include <string.h> +#else +# include <strings.h> +#endif + +static double zero() { return 0.0; } +static double one() { return 1.0; } +static double inf() { return one() / zero(); } + +int +isinf(n) + double n; +{ + static double pinf = 0.0; + static double ninf = 0.0; + + if (pinf == 0.0) { + pinf = inf(); + ninf = -pinf; + } + return memcmp(&n, &pinf, sizeof n) == 0 + || memcmp(&n, &ninf, sizeof n) == 0; +} +#endif |