From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001 From: Jari Vetoniemi Date: Mon, 16 Mar 2020 18:49:26 +0900 Subject: Fresh start --- jni/ruby/missing/signbit.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 jni/ruby/missing/signbit.c (limited to 'jni/ruby/missing/signbit.c') 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 +#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); +} -- cgit v1.2.3