getpwnam.c 1.7 KB

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  1. /*
  2. * getpwnam.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 <unistd.h>
  21. #include <string.h>
  22. #include <errno.h>
  23. #include <fcntl.h>
  24. #include <pwd.h>
  25. #include <paths.h>
  26. #include "config.h"
  27. #define PWD_BUFFER_SIZE 256
  28. /* file descriptor for the password file currently open */
  29. static char line_buff[PWD_BUFFER_SIZE];
  30. static struct passwd pwd;
  31. int getpwnam_r (const char *name, struct passwd *password,
  32. char *buff, size_t buflen, struct passwd **crap)
  33. {
  34. int passwd_fd;
  35. if (name == NULL) {
  36. __set_errno(EINVAL);
  37. return -1;
  38. }
  39. if ((passwd_fd = open(_PATH_PASSWD, O_RDONLY)) < 0)
  40. return -1;
  41. while (__getpwent_r(password, buff, buflen, passwd_fd) != -1)
  42. if (!strcmp(password->pw_name, name)) {
  43. close(passwd_fd);
  44. return 0;
  45. }
  46. close(passwd_fd);
  47. return -1;
  48. }
  49. struct passwd *getpwnam(const char *name)
  50. {
  51. if (getpwnam_r(name, &pwd, line_buff, PWD_BUFFER_SIZE, NULL) != -1) {
  52. return &pwd;
  53. }
  54. return NULL;
  55. }