* string.c (rb_str_capitalize_bang): check length before upcase

  first character.  (ruby-bugs:PR#697)


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@3621 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/string.c b/string.c
index a273400d8..02abb90b0 100644
--- a/string.c
+++ b/string.c
@@ -2092,6 +2092,7 @@ rb_str_capitalize_bang(str)
     int modify = 0;
 
     rb_str_modify(str);
+    if (RSTRING(str)->len == 0 || !RSTRING(str)->ptr) return Qnil;
     s = RSTRING(str)->ptr; send = s + RSTRING(str)->len;
     if (ISLOWER(*s)) {
 	*s = toupper(*s);