diff options
author | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-08-25 15:02:05 +0000 |
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committer | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-08-25 15:02:05 +0000 |
commit | 0dc342de848a642ecce8db697b8fecd83a63e117 (patch) | |
tree | 2b7ed4724aff1f86073e4740134bda9c4aac1a39 /trunk/missing/isinf.c | |
parent | ef70cf7138ab8034b5b806f466e4b484b24f0f88 (diff) |
added tag v1_9_0_4
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'trunk/missing/isinf.c')
-rw-r--r-- | trunk/missing/isinf.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/trunk/missing/isinf.c b/trunk/missing/isinf.c new file mode 100644 index 0000000000..4aef51b213 --- /dev/null +++ b/trunk/missing/isinf.c @@ -0,0 +1,69 @@ +/* public domain rewrite of isinf(3) */ + +#ifdef __osf__ + +#define _IEEE 1 +#include <nan.h> + +int +isinf(double n) +{ + if (IsNANorINF(n) && IsINF(n)) { + return 1; + } + else { + return 0; + } +} + +#else + +#include "ruby/config.h" + +#if defined(HAVE_FINITE) && defined(HAVE_ISNAN) + +#include <math.h> +#ifdef HAVE_IEEEFP_H +#include <ieeefp.h> +#endif + +/* + * isinf may be provided only as a macro. + * ex. HP-UX, Solaris 10 + * http://www.gnu.org/software/automake/manual/autoconf/Function-Portability.html + */ +#ifndef isinf +int +isinf(double n) +{ + return (!finite(n) && !isnan(n)); +} +#endif + +#else + +#ifdef HAVE_STRING_H +# include <string.h> +#else +# include <strings.h> +#endif + +static double zero(void) { return 0.0; } +static double one (void) { return 1.0; } +static double inf (void) { return one() / zero(); } + +int +isinf(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 +#endif |