* string.c (str_buf_cat): check for self concatenation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@17530 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 1 deletions

diff --git a/string.c b/string.c
index 5f1d95806d..4f0517938f 100644
--- a/string.c
+++ b/string.c
@@ -708,9 +708,13 @@ str_buf_cat(str, ptr, len)
     const char *ptr;
     long len;
 {
-    long capa, total;
+    long capa, total, off = -1;;
 
     rb_str_modify(str);
+    if (ptr >= RSTRING(str)->ptr && ptr <= RSTRING(str)->ptr + RSTRING(str)->len) {
+        off = ptr - RSTRING(str)->ptr;
+    }
+    if (len == 0) return 0;
     if (FL_TEST(str, STR_ASSOC)) {
 	FL_UNSET(str, STR_ASSOC);
 	capa = RSTRING(str)->aux.capa = RSTRING(str)->len;
@@ -732,6 +736,9 @@ str_buf_cat(str, ptr, len)
 	}
 	RESIZE_CAPA(str, capa);
     }
+    if (off != -1) {
+        ptr = RSTRING(str)->ptr + off;
+    }
     memcpy(RSTRING(str)->ptr + RSTRING(str)->len, ptr, len);
     RSTRING(str)->len = total;
     RSTRING(str)->ptr[total] = '\0'; /* sentinel */