* process.c (rb_exec_fillarg): bail out a loop eagerly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35919 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Tue Jun  5 19:21:10 2012  Tanaka Akira  <akr@fsij.org>
+
+	* process.c (rb_exec_fillarg): bail out a loop eagerly.
+
 Tue Jun  5 19:15:14 2012  Tanaka Akira  <akr@fsij.org>
 
 	* process.c: add comments about async-signal-safe.

process.c

@@ -1805,10 +1805,12 @@ rb_exec_fillarg(VALUE prog, int argc, VALUE *argv, VALUE env, VALUE opthash, str
         int has_meta = 0;
         int has_nonspace = 0;
         for (p = RSTRING_PTR(prog); *p; p++) {
-            if (*p != ' ' && *p != '\t')
+            if (!has_nonspace && *p != ' ' && *p != '\t')
                 has_nonspace = 1;
-            if (strchr("*?{}[]<>()~&|\\$;'`\"\n", *p))
+            if (!has_meta && strchr("*?{}[]<>()~&|\\$;'`\"\n", *p))
                 has_meta = 1;
+            if (has_nonspace && has_meta)
+                break;
         }
         if (has_nonspace && !has_meta) {
             /* avoid shell since no shell meta charactor found. */