Add struct scratch_buffer and its internal helper functions

These will be used from NSS modules, so they have to be exported.

1 files changed, 52 insertions, 0 deletions

diff --git a/malloc/scratch_buffer_grow.c b/malloc/scratch_buffer_grow.c
new file mode 100644
index 0000000000..3f27e0e03c
--- /dev/null
+++ b/malloc/scratch_buffer_grow.c
@@ -0,0 +1,52 @@
+/* Variable-sized buffer with on-stack default allocation.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <scratch_buffer.h>
+#include <errno.h>
+
+bool
+__libc_scratch_buffer_grow (struct scratch_buffer *buffer)
+{
+  void *new_ptr;
+  size_t new_length = buffer->length * 2;
+
+  /* Discard old buffer.  */
+  scratch_buffer_free (buffer);
+
+  /* Check for overflow.  */
+  if (__glibc_likely (new_length >= buffer->length))
+    new_ptr = malloc (new_length);
+  else
+    {
+      __set_errno (ENOMEM);
+      new_ptr = NULL;
+    }
+
+  if (__glibc_unlikely (new_ptr == NULL))
+    {
+      /* Buffer must remain valid to free.  */
+      scratch_buffer_init (buffer);
+      return false;
+    }
+
+  /* Install new heap-based buffer.  */
+  buffer->data = new_ptr;
+  buffer->length = new_length;
+  return true;
+}
+libc_hidden_def (__libc_scratch_buffer_grow);