1/* vi: set sw=4 ts=4: */
2/*
3 * wfopen_input implementation for busybox
4 *
5 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10/* A number of applets need to open a file for reading, where the filename
11 * is a command line arg.  Since often that arg is '-' (meaning stdin),
12 * we avoid testing everywhere by consolidating things in this routine.
13 *
14 * Note: we also consider "" to mean stdin (for 'cmp' at least).
15 */
16
17#include "libbb.h"
18
19FILE *fopen_or_warn_stdin(const char *filename)
20{
21	FILE *fp = stdin;
22
23	if (filename != bb_msg_standard_input
24	 && filename[0]
25	 && NOT_LONE_DASH(filename)
26	) {
27		fp = fopen_or_warn(filename, "r");
28	}
29
30	return fp;
31}
32