* numeric.c (flo_to_s): reduce fragments if no precision lost.

c.f. [ruby-core:23075]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23144 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Apr  7 01:08:21 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* numeric.c (flo_to_s): reduce fragments if no precision lost.
+	  c.f. [ruby-core:23075]
+
 Mon Apr  6 23:16:08 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in (CFLAGS, CXXFLAGS): override with $cflags and

numeric.c

@@ -522,7 +522,7 @@ static VALUE
 flo_to_s(VALUE flt)
 {
     enum {decimal_mant = DBL_MANT_DIG-DBL_DIG};
-    enum {float_dig = DBL_DIG+2};
+    enum {float_dig = DBL_DIG+1};
     char buf[float_dig + (decimal_mant + CHAR_BIT - 1) / CHAR_BIT + 10];
     double value = RFLOAT_VALUE(flt);
     char *p, *e;
@@ -532,12 +532,15 @@ flo_to_s(VALUE flt)
     else if(isnan(value))
 	return rb_usascii_str_new2("NaN");
 
-    snprintf(buf, sizeof(buf), "%#.*g", float_dig, value); /* ensure to print decimal point */
+# 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.) */
-	snprintf(buf, sizeof(buf), "%#.*e", float_dig - 1, value);
+	FLOFMT(buf, sizeof(buf), "%#.*e", float_dig - 1, value);
 	if (!(e = strchr(buf, 'e'))) {
 	    e = buf + strlen(buf);
 	}

version.h

@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.2"
-#define RUBY_RELEASE_DATE "2009-04-06"
+#define RUBY_RELEASE_DATE "2009-04-07"
 #define RUBY_PATCHLEVEL -1
 #define RUBY_BRANCH_NAME "trunk"
 
@@ -8,7 +8,7 @@
 #define RUBY_VERSION_TEENY 1
 #define RUBY_RELEASE_YEAR 2009
 #define RUBY_RELEASE_MONTH 4
-#define RUBY_RELEASE_DAY 6
+#define RUBY_RELEASE_DAY 7
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];