[unix-history] / usr / src / lib / libc / gen / getlogin.c

/*
 * Copyright (c) 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getlogin.c	5.5 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <stdio.h>
#include <pwd.h>
#include <utmp.h>

static	char	logname[UT_NAMESIZE+1];

char *
getlogin()
{
	static int notcalled = 1;

	if (notcalled) {
		if (getlogname(logname, sizeof(logname) - 1) < 0)
			return((char *)NULL);
		notcalled = 0;
	}
	return(*logname ? logname : (char *)NULL);
}

uid_t	geteuid();

char *
cuserid(s)
	char	*s;
{
	register struct passwd *pwd;

	if ((pwd = getpwuid(geteuid())) == NULL) {
		if (s)
			*s = '\0';
		return(NULL);
	}
	if (s) {
		(void)strncpy(s, pwd->pw_name, L_cuserid);
		return(s);
	}
	return(pwd->pw_name);
}
Commit	Line	Data
05e7d7bc KF	1	/*
	2	* Copyright (c) 1988 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
	10	* by the University of California, Berkeley. The name of the
	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	16	*/
	17
2ce81398	18	#if defined(LIBC_SCCS) && !defined(lint)
e658abae	19	static char sccsid[] = "@(#)getlogin.c 5.5 (Berkeley) %G%";
05e7d7bc	20	#endif /* LIBC_SCCS and not lint */
056d5bbd	21
05e7d7bc KF	22	#include <sys/types.h>
	23	#include <stdio.h>
	24	#include <pwd.h>
d144c87e SL	25	#include <utmp.h>
d144c87e SL	26
05e7d7bc	27	static char logname[UT_NAMESIZE+1];
d144c87e SL	28
	29	char *
	30	getlogin()
	31	{
05e7d7bc KF	32	static int notcalled = 1;
	33
	34	if (notcalled) {
e658abae KB	35	if (getlogname(logname, sizeof(logname) - 1) < 0)
e658abae KB	36	return((char *)NULL);
05e7d7bc KF	37	notcalled = 0;
05e7d7bc KF	38	}
e658abae	39	return(logname ? logname : (char )NULL);
05e7d7bc KF	40	}
	41
	42	uid_t geteuid();
	43
	44	char *
	45	cuserid(s)
	46	char *s;
	47	{
	48	register struct passwd *pwd;
	49
e658abae KB	50	if ((pwd = getpwuid(geteuid())) == NULL) {
e658abae KB	51	if (s)
05e7d7bc KF	52	*s = '\0';
	53	return(NULL);
	54	}
e658abae KB	55	if (s) {
e658abae KB	56	(void)strncpy(s, pwd->pw_name, L_cuserid);
05e7d7bc	57	return(s);
056d5bbd	58	}
05e7d7bc	59	return(pwd->pw_name);
d144c87e	60	}