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- /*
- * Copyright (c) 1988 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@(#)getlogin.c 5.9 (Berkeley) 2/23/91";
- #endif /* LIBC_SCCS and not lint */
-
- #include <sys/param.h>
- #include <pwd.h>
- #include <utmp.h>
- #include <stdio.h>
- #include <string.h>
- #include <unistd.h>
-
- int _logname_valid; /* known to setlogin() */
-
- char *
- getlogin()
- {
- static char logname[MAXLOGNAME + 1];
-
- if (_logname_valid == 0) {
- if (_getlogin(logname, sizeof(logname) - 1) < 0)
- return ((char *)NULL);
- _logname_valid = 1;
- }
- return (*logname ? logname : (char *)NULL);
- }
-
- char *
- cuserid(s)
- char *s;
- {
- register struct passwd *pwd;
-
- if ((pwd = getpwuid(geteuid())) == NULL) {
- if (s)
- *s = '\0';
- return (s);
- }
- if (s) {
- (void)strncpy(s, pwd->pw_name, L_cuserid);
- return (s);
- }
- return (pwd->pw_name);
- }
-