getpwuid.c 1.6 KB

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  1. /*
  2. * getpwuid.c - This file is part of the libc-8086/pwd package for ELKS,
  3. * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
  4. *
  5. * This library is free software; you can redistribute it and/or
  6. * modify it under the terms of the GNU Library General Public
  7. * License as published by the Free Software Foundation; either
  8. * version 2 of the License, or (at your option) any later version.
  9. *
  10. * This library is distributed in the hope that it will be useful,
  11. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. * Library General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU Library General Public
  16. * License along with this library; if not, write to the Free
  17. * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18. *
  19. */
  20. #include <stdlib.h>
  21. #include <unistd.h>
  22. #include <fcntl.h>
  23. #include <pwd.h>
  24. #define PWD_BUFFER_SIZE 256
  25. /* file descriptor for the password file currently open */
  26. static char line_buff[PWD_BUFFER_SIZE];
  27. static struct passwd pwd;
  28. int getpwuid_r (uid_t uid, struct passwd *password,
  29. char *buff, size_t buflen, struct passwd **crap)
  30. {
  31. int passwd_fd;
  32. if ((passwd_fd = open("/etc/passwd", O_RDONLY)) < 0)
  33. return -1;
  34. while (__getpwent_r(password, buff, buflen, passwd_fd) != -1)
  35. if (password->pw_uid == uid) {
  36. close(passwd_fd);
  37. return 0;
  38. }
  39. close(passwd_fd);
  40. return -1;
  41. }
  42. struct passwd *getpwuid(uid_t uid)
  43. {
  44. if (getpwuid_r(uid, &pwd, line_buff, PWD_BUFFER_SIZE, NULL) != -1) {
  45. return &pwd;
  46. }
  47. return NULL;
  48. }