string.c: expand heap

nobu · nobu · commit b3626b3ee7d8 · 2015-04-17T03:26:21.000Z
* string.c (str_buf_cat): expand the heap buffer at making
  str independent, not only just copying.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50336 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
diff --git a/string.c b/string.c
@@ -2194,7 +2194,7 @@ str_buf_cat(VALUE str, const char *ptr, long len)
     if (ptr >= sptr && ptr <= sptr + olen) {
         off = ptr - sptr;
     }
-    rb_str_modify(str);
+    rb_str_modify_expand(str, len);
     if (len == 0) return 0;
     if (STR_EMBED_P(str)) {
 	capa = RSTRING_EMBED_LEN_MAX;

Original file line number	Diff line number	Diff line change
`@@ -2194,7 +2194,7 @@ str_buf_cat(VALUE str, const char *ptr, long len)`
`2194`	`2194`	`if (ptr >= sptr && ptr <= sptr + olen) {`
`2195`	`2195`	`off = ptr - sptr;`
`2196`	`2196`	`}`
`2197`		`- rb_str_modify(str);`
	`2197`	`+ rb_str_modify_expand(str, len);`
`2198`	`2198`	`if (len == 0) return 0;`
`2199`	`2199`	`if (STR_EMBED_P(str)) {`
`2200`	`2200`	`capa = RSTRING_EMBED_LEN_MAX;`