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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-10-07 14:44:17 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-10-07 14:46:40 +0200
commit267d5318e1cbf69a071b5188dda50310af2f2f8b (patch)
tree9b17035763ab4c69458f28fe37258713c45920a5 /lib/tar/padd_file.c
parent3a7d758d1d5a9b6499bdc3f75077932ba66f89d7 (diff)
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>
Diffstat (limited to 'lib/tar/padd_file.c')
-rw-r--r--lib/tar/padd_file.c40
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;
+}