getdirname.c 1.4 KB

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  1. /* Copyright (C) 1992, 1997, 1998, 2000 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, see
  13. <http://www.gnu.org/licenses/>. */
  14. #include <features.h>
  15. #ifdef __USE_GNU
  16. #include <unistd.h>
  17. #include <sys/stat.h>
  18. #include <stdlib.h>
  19. #include <string.h>
  20. /* Return a malloc'd string containing the current directory name.
  21. If the environment variable `PWD' is set, and its value is correct,
  22. that value is used. */
  23. char *
  24. get_current_dir_name (void)
  25. {
  26. char *pwd;
  27. struct stat64 dotstat, pwdstat;
  28. pwd = getenv ("PWD");
  29. if (pwd != NULL
  30. && stat64 (".", &dotstat) == 0
  31. && stat64 (pwd, &pwdstat) == 0
  32. && pwdstat.st_dev == dotstat.st_dev
  33. && pwdstat.st_ino == dotstat.st_ino)
  34. /* The PWD value is correct. Use it. */
  35. return strdup (pwd);
  36. return getcwd ((char *) NULL, 0);
  37. }
  38. #endif