64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
#include "LongDouble.h"
|
|
#include <stdio.h>
|
|
#include <stdarg.h>
|
|
#include <float.h>
|
|
|
|
#if defined (__CYGWIN__) || defined(__INTERIX)
|
|
# define strtold(str, endptr) ((long double) strtod((str), (endptr)))
|
|
#endif /* defined (__CYGWIN__) */
|
|
|
|
static VALUE rb_cBigDecimal = Qnil;
|
|
static VALUE bigdecimal_load(VALUE unused);
|
|
static VALUE bigdecimal_failed(VALUE value);
|
|
|
|
VALUE
|
|
rbffi_longdouble_new(long double ld)
|
|
{
|
|
if (!RTEST(rb_cBigDecimal)) {
|
|
/* allow fallback if the bigdecimal library is unavailable in future ruby versions */
|
|
rb_cBigDecimal = rb_rescue(bigdecimal_load, Qnil, bigdecimal_failed, rb_cObject);
|
|
}
|
|
|
|
if (RTEST(rb_cBigDecimal) && rb_cBigDecimal != rb_cObject) {
|
|
char buf[128];
|
|
return rb_funcall(rb_cBigDecimal, rb_intern("new"), 1, rb_str_new(buf, sprintf(buf, "%.35Le", ld)));
|
|
}
|
|
|
|
/* Fall through to handling as a float */
|
|
return rb_float_new(ld);
|
|
}
|
|
|
|
long double
|
|
rbffi_num2longdouble(VALUE value)
|
|
{
|
|
if (TYPE(value) == T_FLOAT) {
|
|
return rb_num2dbl(value);
|
|
}
|
|
|
|
if (!RTEST(rb_cBigDecimal) && rb_const_defined(rb_cObject, rb_intern("BigDecimal"))) {
|
|
rb_cBigDecimal = rb_const_get(rb_cObject, rb_intern("BigDecimal"));
|
|
}
|
|
|
|
if (RTEST(rb_cBigDecimal) && rb_cBigDecimal != rb_cObject && RTEST(rb_obj_is_kind_of(value, rb_cBigDecimal))) {
|
|
VALUE s = rb_funcall(value, rb_intern("to_s"), 1, rb_str_new2("E"));
|
|
return strtold(RSTRING_PTR(s), NULL);
|
|
}
|
|
|
|
/* Fall through to handling as a float */
|
|
return rb_num2dbl(value);
|
|
}
|
|
|
|
|
|
static VALUE
|
|
bigdecimal_load(VALUE unused)
|
|
{
|
|
rb_require("bigdecimal");
|
|
return rb_const_get(rb_cObject, rb_intern("BigDecimal"));
|
|
}
|
|
|
|
static VALUE
|
|
bigdecimal_failed(VALUE value)
|
|
{
|
|
return value;
|
|
}
|