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 #include "libbb.h"
10 
11 /* A number of applets need to open a file for reading, where the filename
12  * is a command line arg.  Since often that arg is '-' (meaning stdin),
13  * we avoid testing everywhere by consolidating things in this routine.
14  */
15 
fopen_or_warn_stdin(const char * filename)16 FILE* FAST_FUNC fopen_or_warn_stdin(const char *filename)
17 {
18 	FILE *fp = stdin;
19 
20 	if (filename != bb_msg_standard_input
21 	 && NOT_LONE_DASH(filename)
22 	) {
23 		fp = fopen_or_warn(filename, "r");
24 	}
25 	return fp;
26 }
27 
xfopen_stdin(const char * filename)28 FILE* FAST_FUNC xfopen_stdin(const char *filename)
29 {
30 	FILE *fp = fopen_or_warn_stdin(filename);
31 	if (fp)
32 		return fp;
33 	xfunc_die();  /* We already output an error message. */
34 }
35 
open_or_warn_stdin(const char * filename)36 int FAST_FUNC open_or_warn_stdin(const char *filename)
37 {
38 	int fd = STDIN_FILENO;
39 
40 	if (filename != bb_msg_standard_input
41 	 && NOT_LONE_DASH(filename)
42 	) {
43 		fd = open_or_warn(filename, O_RDONLY);
44 	}
45 
46 	return fd;
47 }
48 
xopen_stdin(const char * filename)49 int FAST_FUNC xopen_stdin(const char *filename)
50 {
51 	int fd = open_or_warn_stdin(filename);
52 	if (fd >= 0)
53 		return fd;
54 	xfunc_die();  /* We already output an error message. */
55 }
56