Cleanup: Move padd_file function to libtar

It's only ever used for padding tarballs.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 40 insertions, 0 deletions

diff --git a/lib/tar/padd_file.c b/lib/tar/padd_file.c
new file mode 100644
index 0000000..471370d
--- /dev/null
+++ b/lib/tar/padd_file.c
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * padd_file.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "tar.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+int padd_file(int outfd, sqfs_u64 size)
+{
+	size_t padd_sz = size % TAR_RECORD_SIZE;
+	int status = -1;
+	sqfs_u8 *buffer;
+
+	if (padd_sz == 0)
+		return 0;
+
+	padd_sz = TAR_RECORD_SIZE - padd_sz;
+
+	buffer = calloc(1, padd_sz);
+	if (buffer == NULL)
+		goto fail_errno;
+
+	if (write_data("padding output file to block size",
+		       outfd, buffer, padd_sz)) {
+		goto out;
+	}
+
+	status = 0;
+out:
+	free(buffer);
+	return status;
+fail_errno:
+	perror("padding output file to block size");
+	goto out;
+}