confstr.c 1.7 KB

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  1. /* Copyright (C) 1991, 1996, 1997, 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 Library General Public License as
  5. published by the Free Software Foundation; either version 2 of the
  6. 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. Library General Public License for more details.
  11. You should have received a copy of the GNU Library General Public
  12. License along with the GNU C Library; see the file COPYING.LIB. If not,
  13. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14. Boston, MA 02111-1307, USA. */
  15. #include <stddef.h>
  16. #include <errno.h>
  17. #include <unistd.h>
  18. #include <string.h>
  19. #define CS_PATH "/bin:/usr/bin"
  20. /* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes
  21. of BUF with the value corresponding to NAME and zero-terminate BUF.
  22. Return the number of bytes required to hold NAME's entire value. */
  23. size_t confstr ( int name, char *buf, size_t len)
  24. {
  25. const char *string;
  26. size_t string_len;
  27. switch (name)
  28. {
  29. case _CS_PATH:
  30. {
  31. static const char cs_path[] = CS_PATH;
  32. string = cs_path;
  33. string_len = sizeof (cs_path);
  34. }
  35. break;
  36. default:
  37. __set_errno (EINVAL);
  38. return 0;
  39. }
  40. if (len > 0 && buf != NULL)
  41. {
  42. if (string_len <= len)
  43. memcpy (buf, string, string_len);
  44. else
  45. {
  46. memcpy (buf, string, len - 1);
  47. buf[len - 1] = '\0';
  48. }
  49. }
  50. return string_len;
  51. }