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 source tree.
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
15#include "libbb.h"
16
17FILE* FAST_FUNC fopen_or_warn_stdin(const char *filename)
18{
19	FILE *fp = stdin;
20
21	if (filename != bb_msg_standard_input
22	 && NOT_LONE_DASH(filename)
23	) {
24		fp = fopen_or_warn(filename, "r");
25	}
26	return fp;
27}
28
29FILE* FAST_FUNC xfopen_stdin(const char *filename)
30{
31	FILE *fp = fopen_or_warn_stdin(filename);
32	if (fp)
33		return fp;
34	xfunc_die();	/* We already output an error message. */
35}
36
37int FAST_FUNC open_or_warn_stdin(const char *filename)
38{
39	int fd = STDIN_FILENO;
40
41	if (filename != bb_msg_standard_input
42	 && NOT_LONE_DASH(filename)
43	) {
44		fd = open_or_warn(filename, O_RDONLY);
45	}
46
47	return fd;
48}
49
50int FAST_FUNC xopen_stdin(const char *filename)
51{
52	int fd = open_or_warn_stdin(filename);
53	if (fd >= 0)
54		return fd;
55	xfunc_die();	/* We already output an error message. */
56}
57