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author | Jari Vetoniemi <jari.vetoniemi@indooratlas.com> | 2020-03-16 18:49:26 +0900 |
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committer | Jari Vetoniemi <jari.vetoniemi@indooratlas.com> | 2020-03-30 00:39:06 +0900 |
commit | fcbf63e62c627deae76c1b8cb8c0876c536ed811 (patch) | |
tree | 64cb17de3f41a2b6fef2368028fbd00349946994 /jni/ruby/missing/signbit.c |
Fresh start
Diffstat (limited to 'jni/ruby/missing/signbit.c')
-rw-r--r-- | jni/ruby/missing/signbit.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/jni/ruby/missing/signbit.c b/jni/ruby/missing/signbit.c new file mode 100644 index 0000000..2f7ce8c --- /dev/null +++ b/jni/ruby/missing/signbit.c @@ -0,0 +1,19 @@ +#include <limits.h> +#include "ruby.h" + +int +signbit(double x) +{ + enum {double_per_long = sizeof(double) / sizeof(long)}; + enum {long_msb = sizeof(long) * CHAR_BIT - 1}; + union {double d; unsigned long i[double_per_long];} u; + unsigned long l; + + u.d = x; +#ifdef WORDS_BIGENDIAN + l = u.i[0]; +#else + l = u.i[double_per_long - 1]; +#endif + return (int)(l >> long_msb); +} |