* string.c (rb_string_value_cstr): rb_str_modify can change

  RSTRING_PTR.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30648 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 20 insertions, 0 deletions

diff --git a/ext/-test-/string/cstr.c b/ext/-test-/string/cstr.c
new file mode 100644
index 0000000000..d4ff360575
--- /dev/null
+++ b/ext/-test-/string/cstr.c
@@ -0,0 +1,20 @@
+#include "ruby.h"
+
+static VALUE
+bug_str_cstr_term(VALUE str)
+{
+    long len;
+    char *s;
+    rb_str_modify(str);
+    len = RSTRING_LEN(str);
+    RSTRING_PTR(str)[len] = 'x';
+    s = StringValueCStr(str);
+    rb_gc();
+    return INT2NUM(s[len]);
+}
+
+void
+Init_cstr(VALUE klass)
+{
+    rb_define_method(klass, "cstr_term", bug_str_cstr_term, 0);
+}