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 
fopen_or_warn_stdin(const char * filename)17 FILE* 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 
xfopen_stdin(const char * filename)29 FILE* 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 
open_or_warn_stdin(const char * filename)37 int 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 
xopen_stdin(const char * filename)50 int 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