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#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