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)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 xfopen_stdin(const char * filename)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 open_or_warn_stdin(const char * filename)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 xopen_stdin(const char * filename)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