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-rw-r--r--numeric.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/numeric.c b/numeric.c
index 2d6691de61f..bb554856695 100644
--- a/numeric.c
+++ b/numeric.c
@@ -521,7 +521,9 @@ rb_float_new(double d)
static VALUE
flo_to_s(VALUE flt)
{
- char buf[32];
+ enum {decimal_mant = DBL_MANT_DIG-DBL_DIG};
+ enum {float_dig = DBL_DIG+2};
+ char buf[float_dig + (decimal_mant + CHAR_BIT - 1) / CHAR_BIT + 10];
double value = RFLOAT_VALUE(flt);
char *p, *e;
@@ -530,12 +532,12 @@ flo_to_s(VALUE flt)
else if(isnan(value))
return rb_usascii_str_new2("NaN");
- snprintf(buf, sizeof(buf), "%#.15g", value); /* ensure to print decimal point */
+ snprintf(buf, sizeof(buf), "%#.*g", float_dig, value); /* ensure to print decimal point */
if (!(e = strchr(buf, 'e'))) {
e = buf + strlen(buf);
}
if (!ISDIGIT(e[-1])) { /* reformat if ended with decimal point (ex 111111111111111.) */
- snprintf(buf, sizeof(buf), "%#.14e", value);
+ snprintf(buf, sizeof(buf), "%#.*e", float_dig - 1, value);
if (!(e = strchr(buf, 'e'))) {
e = buf + strlen(buf);
}