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 source tree.
   8 */
   9#include "libbb.h"
  10
  11FILE* FAST_FUNC fopen_or_warn(const char *path, const char *mode)
  12{
  13        FILE *fp = fopen(path, mode);
  14        if (!fp) {
  15                bb_simple_perror_msg(path);
  16                //errno = 0; /* why? */
  17        }
  18        return fp;
  19}
  20
  21FILE* FAST_FUNC fopen_for_read(const char *path)
  22{
  23        return fopen(path, "r");
  24}
  25
  26FILE* FAST_FUNC xfopen_for_read(const char *path)
  27{
  28        return xfopen(path, "r");
  29}
  30
  31FILE* FAST_FUNC fopen_for_write(const char *path)
  32{
  33        return fopen(path, "w");
  34}
  35
  36FILE* FAST_FUNC xfopen_for_write(const char *path)
  37{
  38        return xfopen(path, "w");
  39}
  40
  41static FILE* xfdopen_helper(unsigned fd_and_rw_bit)
  42{
  43        FILE* fp = fdopen(fd_and_rw_bit >> 1, fd_and_rw_bit & 1 ? "w" : "r");
  44        if (!fp)
  45                bb_die_memory_exhausted();
  46        return fp;
  47}
  48FILE* FAST_FUNC xfdopen_for_read(int fd)
  49{
  50        return xfdopen_helper(fd << 1);
  51}
  52FILE* FAST_FUNC xfdopen_for_write(int fd)
  53{
  54        return xfdopen_helper((fd << 1) + 1);
  55}
  56