1  /* Copyright (C) 1992-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <unistd.h>
      19  #include <include/sys/stat.h>
      20  #include <stdlib.h>
      21  #include <string.h>
      22  
      23  /* Return a malloc'd string containing the current directory name.
      24     If the environment variable `PWD' is set, and its value is correct,
      25     that value is used.  */
      26  
      27  char *
      28  get_current_dir_name (void)
      29  {
      30    char *pwd;
      31    struct __stat64_t64 dotstat, pwdstat;
      32  
      33    pwd = getenv ("PWD");
      34    if (pwd != NULL
      35        && __stat64_time64 (".", &dotstat) == 0
      36        && __stat64_time64 (pwd, &pwdstat) == 0
      37        && pwdstat.st_dev == dotstat.st_dev
      38        && pwdstat.st_ino == dotstat.st_ino)
      39      /* The PWD value is correct.  Use it.  */
      40      return __strdup (pwd);
      41  
      42    return __getcwd ((char *) NULL, 0);
      43  }