LXR busybox/libbb/wfopen

   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