xref: /freebsd/lib/libc/gen/getlogin.c (revision dc36d6f9)

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "namespace.h"
#include <pthread.h>
#include "un-namespace.h"

#include "libc_private.h"

extern int		_getlogin(char *, int);

char *
getlogin(void)
{
	static char logname[MAXLOGNAME];

	if (_getlogin(logname, sizeof(logname)) < 0)
		return (NULL);
	return (logname[0] != '\0' ? logname : NULL);
}

int
getlogin_r(char *logname, size_t namelen)
{
	char tmpname[MAXLOGNAME];
	int	len;

	if (namelen < 1)
		return (ERANGE);
	logname[0] = '\0';

	if (_getlogin(tmpname, sizeof(tmpname)) < 0)
		return (errno);
	len = strlen(tmpname) + 1;
	if (len > namelen)
		return (ERANGE);
	strlcpy(logname, tmpname, len);
	return (0);
}

/* FreeBSD 12 and earlier compat. */
int
__getlogin_r_fbsd12(char *logname, int namelen)
{
	if (namelen < 1)
		return (ERANGE);
	return (getlogin_r(logname, namelen));
}
__sym_compat(getlogin_r, __getlogin_r_fbsd12, FBSD_1.0);