busybox/libbb/my_getpwuid.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

 /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
  * flexible :
  *
  * if bufsize is > 0 char *user can not be set to NULL
  *                   on success username is written on static allocated buffer
  *                   on failure uid as string is written to buffer and NULL is returned
  * if bufsize is = 0 char *user can be set to NULL
  *                   on success username is returned 
  *                   on failure NULL is returned
  * if bufsize is < 0 char *user can be set to NULL
  *                   on success username is returned
  *                   on failure an error message is printed and the program exits   
  */
  
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "libbb.h"
#include "pwd_.h"
#include "grp_.h"



/* gets a username given a uid */
char * my_getpwuid(char *name, long uid, int bufsize)
{
	struct passwd *myuser;

	myuser  = getpwuid(uid);
	if (myuser==NULL) {
		if(bufsize > 0) {
			assert(name != NULL);
			snprintf(name, bufsize, "%ld", (long)uid);
		}
		if (bufsize < 0 ) {
			bb_error_msg_and_die("unknown uid %ld", (long)uid); 
		}
		return NULL;
	} else {
		if(bufsize > 0 )
		{
			assert(name != NULL);
			return safe_strncpy(name, myuser->pw_name, bufsize);
		}
		return myuser->pw_name;
	}
}

/* END CODE */
/*
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*/