kotovalexarian-likes-github/ruby--ruby
1
0
Fork 0
mirror of https://github.com/ruby/ruby.git synced 2022-11-09 12:17:21 -05:00
Code Releases Activity

* numeric.c (flo_to_s): make minimum string representation.

Browse source 
[ruby-core:30145]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27745 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2010-05-12 01:57:08 +00:00
parent 7abe8a5560
commit 07b314f07b
3 changed files with 55 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
ChangeLog
View file

@ -1,3 +1,8 @@
Wed May 12 10:57:04 2010 Nobuyoshi Nakada <nobu@ruby-lang.org>
* numeric.c (flo_to_s): make minimum string representation.
[ruby-core:30145]
Wed May 12 09:21:05 2010 NARUSE, Yui <naruse@ruby-lang.org>
* re.c (rb_reg_initialize_m): fix wrong index for the lang

59
numeric.c
View file

@ -558,35 +558,62 @@ rb_float_new(double d)
static VALUE
flo_to_s(VALUE flt)
{
char *ruby_dtoa(double d_, int mode, int ndigits, int *decpt, int *sign, char **rve);
enum {decimal_mant = DBL_MANT_DIG-DBL_DIG};
enum {float_dig = DBL_DIG+1};
char buf[float_dig + (decimal_mant + CHAR_BIT - 1) / CHAR_BIT + 10];
double value = RFLOAT_VALUE(flt);
VALUE s;
char *p, *e;
int sign, decpt, digs;
if (isinf(value))
return rb_usascii_str_new2(value < 0 ? "-Infinity" : "Infinity");
else if (isnan(value))
return rb_usascii_str_new2("NaN");
# define FLOFMT(buf, size, fmt, prec, val) snprintf(buf, size, fmt, prec, val), \
(void)((atof(buf) == val) || snprintf(buf, size, fmt, (prec)+1, val))
FLOFMT(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.) */
FLOFMT(buf, sizeof(buf), "%#.*e", float_dig - 1, value);
if (!(e = strchr(buf, 'e'))) {
e = buf + strlen(buf);
p = ruby_dtoa(value, 0, 0, &decpt, &sign, &e);
s = sign ? rb_usascii_str_new_cstr("-") : rb_usascii_str_new(0, 0);
if ((digs = (int)(e - p)) >= (int)sizeof(buf)) digs = (int)sizeof(buf) - 1;
memcpy(buf, p, digs);
xfree(p);
if (decpt > 0) {
if (decpt < digs) {
memmove(buf + decpt + 1, buf + decpt, digs - decpt);
buf[decpt] = '.';
rb_str_cat(s, buf, digs + 1);
}
else if (decpt - digs < float_dig) {
rb_str_cat(s, buf, digs);
rb_str_cat(s, ".0", 2);
}
else {
goto exp;
}
}
p = e;
while (p[-1]=='0' && ISDIGIT(p[-2]))
p--;
memmove(p, e, strlen(e)+1);
return rb_usascii_str_new2(buf);
else if (decpt > -4) {
long len;
char *ptr;
rb_str_cat(s, "0.", 2);
rb_str_resize(s, (len = RSTRING_LEN(s)) - decpt + digs);
ptr = RSTRING_PTR(s);
memset(ptr += len, '0', -decpt);
memcpy(ptr -= decpt, buf, digs);
}
else {
exp:
if (digs > 1) {
memmove(buf + 2, buf + 1, digs - 1);
}
else {
buf[2] = '0';
digs++;
}
buf[1] = '.';
rb_str_cat(s, buf, digs + 1);
rb_str_catf(s, "e%+d", decpt - 1);
}
return s;
}
/*

7
test/ruby/test_float.rb
View file

@ -136,6 +136,13 @@ class TestFloat < Test::Unit::TestCase
assert_equal("NaN", (inf / inf).to_s)
assert_equal("1.0e+18", 1000_00000_00000_00000.0.to_s)
bug3273 = '[ruby-core:30145]'
[0.21611564636388508, 0.56].each do |f|
s = f.to_s
assert_equal(f, s.to_f, bug3273)
assert_not_equal(f, s.chop.to_f, bug3273)
end
end
def test_coerce