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