File: putpwent.c

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/* Copyright (C) 1991-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <stdio.h>
#include <pwd.h>

#define _S(x)	x ?: ""

/* Write an entry to the given stream.
   This must know the format of the password file.  */
int
putpwent (p, stream)
     const struct passwd *p;
     FILE *stream;
{
  if (p == NULL || stream == NULL)
    {
      __set_errno (EINVAL);
      return -1;
    }

  if (p->pw_name[0] == '+' || p->pw_name[0] == '-')
    {
      if (fprintf (stream, "%s:%s:::%s:%s:%s\n",
		   p->pw_name, _S (p->pw_passwd),
		   _S (p->pw_gecos), _S (p->pw_dir), _S (p->pw_shell)) < 0)
	return -1;
    }
  else
    {
      if (fprintf (stream, "%s:%s:%lu:%lu:%s:%s:%s\n",
		   p->pw_name, _S (p->pw_passwd),
		   (unsigned long int) p->pw_uid,
		   (unsigned long int) p->pw_gid,
		   _S (p->pw_gecos), _S (p->pw_dir), _S (p->pw_shell)) < 0)
	return -1;
    }
  return 0;
}