getdirname.c

来自「一个C源代码分析器」· C语言 代码 · 共 46 行

/* Copyright (C) 1992 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>

/* Return a malloc'd string containing the current directory name.
   If the environment variable `PWD' is set, and its value is correct,
   that value is used.  */

char *
DEFUN_VOID(get_current_dir_name)
{
  char *pwd;
  struct stat dotstat, pwdstat;

  pwd = getenv ("PWD");
  if (pwd != NULL &&
      stat (".", &dotstat) == 0 &&
      stat (pwd, &pwdstat) == 0 &&
      pwdstat.st_dev == dotstat.st_dev &&
      pwdstat.st_ino == dotstat.st_ino)
    /* The PWD value is correct.  Use it.  */
    return strdup (pwd);

  return getcwd ((char *) NULL, 0);
}