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 16FILE* 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 28FILE* 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 36int 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 49int 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