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-rw-r--r--lib/malloc/scratch_buffer_dupfree.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/malloc/scratch_buffer_dupfree.c b/lib/malloc/scratch_buffer_dupfree.c
new file mode 100644
index 0000000..eb3b95c
--- /dev/null
+++ b/lib/malloc/scratch_buffer_dupfree.c
@@ -0,0 +1,41 @@
+/* Variable-sized buffer with on-stack default allocation.
+ Copyright (C) 2020-2022 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
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _LIBC
+# include <libc-config.h>
+#endif
+
+#include <scratch_buffer.h>
+#include <string.h>
+
+void *
+__libc_scratch_buffer_dupfree (struct scratch_buffer *buffer, size_t size)
+{
+ void *data = buffer->data;
+ if (data == buffer->__space.__c)
+ {
+ void *copy = malloc (size);
+ return copy != NULL ? memcpy (copy, data, size) : NULL;
+ }
+ else
+ {
+ void *copy = realloc (data, size);
+ return copy != NULL ? copy : data;
+ }
+}
+libc_hidden_def (__libc_scratch_buffer_dupfree)