pwd/getpw.c

   1 /* Copyright (C) 1991, 1992 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <pwd.h>
  23
  24
  25 /* Re-construct the password-file line for the given uid
  26    in the given buffer.  This knows the format that the caller
  27    will expect, but this need not be the format of the password file.  */
  28 int
  29 DEFUN(getpw, (uid, buf), __uid_t uid AND register char *buf)
  30 {
  31   register struct passwd *p;
  32
  33   if (buf == NULL)
  34     {
  35       errno = EINVAL;
  36       return -1;
  37     }
  38
  39   p = getpwuid (uid);
  40   if (p == NULL)
  41     return -1;
  42
  43   if (sprintf (buf, "%s:%s:%u:%u:%s:%s:%s", p->pw_name, p->pw_passwd,
  44                p->pw_uid, p->pw_gid, p->pw_gecos, p->pw_dir, p->pw_shell) < 0)
  45     return -1;
  46
  47   return 0;
  48 }