merges r21298 from trunk into ruby_1_9_1.

* numeric.c (ruby_float_step): extracted from num_step().

* range.c (range_step): uses ruby_float_step() for float range.
  [ruby-dev:37691]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21322 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 41 insertions, 21 deletions

diff --git a/ChangeLog b/ChangeLog
index 09367b17af..d5cc2e5d5e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Sun Jan  4 11:58:43 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* numeric.c (ruby_float_step): extracted from num_step().
+
+	* range.c (range_step): uses ruby_float_step() for float range.
+	  [ruby-dev:37691]
+
 Sun Jan  4 11:11:31 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/extmk.rb (extmake): does not use both of makefile.rb and
diff --git a/numeric.c b/numeric.c
index df942b302f..4fe06d2d4b 100644
--- a/numeric.c
+++ b/numeric.c
@@ -1424,6 +1424,34 @@ num_truncate(VALUE num)
 }
 
 
+int
+ruby_float_step(VALUE from, VALUE to, VALUE step, int excl)
+{
+    if (TYPE(from) == T_FLOAT || TYPE(to) == T_FLOAT || TYPE(step) == T_FLOAT) {
+	const double epsilon = DBL_EPSILON;
+	double beg = NUM2DBL(from);
+	double end = NUM2DBL(to);
+	double unit = NUM2DBL(step);
+	double n = (end - beg)/unit;
+	double err = (fabs(beg) + fabs(end) + fabs(end-beg)) / fabs(unit) * epsilon;
+	long i;
+
+	if (isinf(unit)) {
+	    if (unit > 0) rb_yield(DBL2NUM(beg));
+	}
+	else {
+	    if (err>0.5) err=0.5;
+	    n = floor(n + err);
+	    if (!excl) n++;
+	    for (i=0; i<n; i++) {
+		rb_yield(DBL2NUM(i*unit+beg));
+	    }
+	}
+	return Qtrue;
+    }
+    return Qfalse;
+}
+
 /*
  *  call-seq:
  *     num.step(limit, step ) {|i| block }     => num
@@ -1494,27 +1522,7 @@ num_step(int argc, VALUE *argv, VALUE from)
 	    }
 	}
     }
-    else if (TYPE(from) == T_FLOAT || TYPE(to) == T_FLOAT || TYPE(step) == T_FLOAT) {
-	const double epsilon = DBL_EPSILON;
-	double beg = NUM2DBL(from);
-	double end = NUM2DBL(to);
-	double unit = NUM2DBL(step);
-	double n = (end - beg)/unit;
-	double err = (fabs(beg) + fabs(end) + fabs(end-beg)) / fabs(unit) * epsilon;
-	long i;
-
-	if (isinf(unit)) {
-	    if (unit > 0) rb_yield(DBL2NUM(beg));
-	}
-	else {
-	    if (err>0.5) err=0.5;
-	    n = floor(n + err) + 1;
-	    for (i=0; i<n; i++) {
-		rb_yield(DBL2NUM(i*unit+beg));
-	    }
-	}
-    }
-    else {
+    else if (!ruby_float_step(from, to, step, Qfalse)) {
 	VALUE i = from;
 	ID cmp;
 
diff --git a/range.c b/range.c
index 0e9b390c39..bcbb9d9218 100644
--- a/range.c
+++ b/range.c
@@ -267,6 +267,8 @@ step_i(VALUE i, void *arg)
     return Qnil;
 }
 
+extern int ruby_float_step(VALUE from, VALUE to, VALUE step, int excl);
+
 /*
  *  call-seq:
  *     rng.step(n=1) {| obj | block }    => rng
@@ -334,6 +336,9 @@ range_step(int argc, VALUE *argv, VALUE range)
 	}
 
     }
+    else if (ruby_float_step(b, e, step, EXCL(range))) {
+	/* done */
+    }
     else if (rb_obj_is_kind_of(b, rb_cNumeric) ||
 	     !NIL_P(rb_check_to_integer(b, "to_int")) ||
 	     !NIL_P(rb_check_to_integer(e, "to_int"))) {