LXR busybox/libbb/wfopen.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Utility routines.
   4 *
   5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   8 */
   9
  10#include "libbb.h"
  11
  12FILE* FAST_FUNC fopen_or_warn(const char *path, const char *mode)
  13{
  14        FILE *fp = fopen(path, mode);
  15        if (!fp) {
  16                bb_simple_perror_msg(path);
  17                //errno = 0; /* why? */
  18        }
  19        return fp;
  20}
  21
  22FILE* FAST_FUNC fopen_for_read(const char *path)
  23{
  24        return fopen(path, "r");
  25}
  26
  27FILE* FAST_FUNC xfopen_for_read(const char *path)
  28{
  29        return xfopen(path, "r");
  30}
  31
  32FILE* FAST_FUNC fopen_for_write(const char *path)
  33{
  34        return fopen(path, "w");
  35}
  36
  37FILE* FAST_FUNC xfopen_for_write(const char *path)
  38{
  39        return xfopen(path, "w");
  40}
  41
  42static FILE* xfdopen_helper(unsigned fd_and_rw_bit)
  43{
  44        FILE* fp = fdopen(fd_and_rw_bit >> 1, fd_and_rw_bit & 1 ? "w" : "r");
  45        if (!fp)
  46                bb_error_msg_and_die(bb_msg_memory_exhausted);
  47        return fp;
  48}
  49FILE* FAST_FUNC xfdopen_for_read(int fd)
  50{
  51        return xfdopen_helper(fd << 1);
  52}
  53FILE* FAST_FUNC xfdopen_for_write(int fd)
  54{
  55        return xfdopen_helper((fd << 1) + 1);
  56}
  57