chore: Add copyright headers to all source files

examples/list.c

@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2023, apio.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * list.c: Example utility which lists files in a tar archive.
+ */
+
 #include <minitar.h>
 #include <stdio.h>
 

examples/untar.c

@@ -1,4 +1,10 @@
-/* Simple untar example for POSIX systems using minitar. */
+/*
+ * Copyright (c) 2023, apio.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * untar.c: Example utility which extracts files from a tar archive (POSIX only).
+ */
 
 #include <errno.h>
 #include <fcntl.h>

minitar.h

@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2022-2023, apio.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * minitar.h: The minitar header.
+ */
+
 #ifndef MINITAR_H
 #define MINITAR_H
 #include <stddef.h>

src/tar.c

@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2022-2023, apio.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * tar.c: minitar API implementation.
+ */
+
 #include "tar.h"
 #include "minitar.h"
 #include <stdio.h>
@@ -26,8 +34,7 @@ int minitar_close(struct minitar* mp)
 
 // Try to read a valid header, and construct an entry from it. If the 512-byte block at the current read offset is not a
 // valid header, valid is set to 0 so we can try again with the next block. In any other case, valid is set to 1. This
-// helps distinguish valid return values, null pointers that should be returned to the user (for example, EOF), and
-// invalid headers where we should just try again until we find a valid one.
+// helps distinguish valid return values, EOF, and invalid headers that we should just skip.
 static int minitar_try_to_read_valid_entry(struct minitar* mp, struct minitar_entry* out, int* valid)
 {
     struct tar_header hdr;

src/tar.h

@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2022-2023, apio.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * tar.h: tar header structure.
+ */
+
 #ifndef MINITAR_TAR_H
 #define MINITAR_TAR_H
 

src/util.c

@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2022-2023, apio.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * util.c: Utility functions for minitar.
+ */
+
 #include "minitar.h"
 #include "tar.h"
 #include <ctype.h>