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cuserid.c revision 1.6 
      1 /*-
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. Neither the name of the University nor the names of its contributors
     14  *    may be used to endorse or promote products derived from this software
     15  *    without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 #if defined(LIBC_SCCS) && !defined(lint)
     32 #if 0
     33 static char sccsid[] = "@(#)cuserid.c	8.1 (Berkeley) 6/4/93";
     34 #else
     35 __RCSID("$NetBSD: cuserid.c,v 1.6 2003/08/07 16:44:17 agc Exp $");
     36 #endif
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <pwd.h>
     40 #include <stdio.h>
     41 #include <string.h>
     42 #include <unistd.h>
     43 
     44 char *
     45 cuserid(s)
     46 	char *s;
     47 {
     48 	struct passwd *pw;
     49 	static char buf[L_cuserid];
     50 
     51 	/* s may be NULL */
     52 
     53 	if ((pw = getpwuid(geteuid())) == NULL) {
     54 		if (s)
     55 			*s = '\0';
     56 		return (s);
     57 	}
     58 	if (!s)
     59 		s = buf;
     60 	(void)strncpy(s, pw->pw_name, L_cuserid);
     61 	return (s);
     62 }
     63