* include/ruby/ruby.h (ALLOCV): new API for exception-safe

  temporary buffer.  [ruby-core:34844]
* string.c (rb_alloc_tmp_buffer, rb_free_tmp_buffer):
  implementation of the API.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30661 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/string.c b/string.c
index f7c0ff7762..d4d1c9f7da 100644
--- a/string.c
+++ b/string.c
@@ -45,6 +45,8 @@
 #undef rb_str_buf_cat2
 #undef rb_str_cat2
 
+static VALUE rb_str_clear(VALUE str);
+
 VALUE rb_cString;
 VALUE rb_cSymbol;
 
@@ -765,6 +767,22 @@ rb_str_tmp_new(long len)
     return str_new(0, 0, len);
 }
 
+void *
+rb_alloc_tmp_buffer(volatile VALUE *store, long len)
+{
+    VALUE s = rb_str_tmp_new(len);
+    *store = s;
+    return RSTRING_PTR(s);
+}
+
+void
+rb_free_tmp_buffer(volatile VALUE *store)
+{
+    VALUE s = *store;
+    *store = 0;
+    if (s) rb_str_clear(s);
+}
+
 void
 rb_str_free(VALUE str)
 {