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Annotation of src/lib/libc/gen/getlogin.c, Revision 1.3

1.1       cgd         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, 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. All advertising materials mentioning features or use of this software
                     14:  *    must display the following acknowledgement:
                     15:  *     This product includes software developed by the University of
                     16:  *     California, Berkeley and its contributors.
                     17:  * 4. Neither the name of the University nor the names of its contributors
                     18:  *    may be used to endorse or promote products derived from this software
                     19:  *    without specific prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     31:  * SUCH DAMAGE.
                     32:  */
                     33:
                     34: #if defined(LIBC_SCCS) && !defined(lint)
1.3     ! jtc        35: /*static char *sccsid = "from: @(#)getlogin.c  5.9 (Berkeley) 2/23/91";*/
        !            36: static char *rcsid = "$Id: getlogin.c,v 1.2 1993/07/30 08:22:28 mycroft Exp $";
1.1       cgd        37: #endif /* LIBC_SCCS and not lint */
                     38:
                     39: #include <sys/param.h>
                     40: #include <pwd.h>
                     41: #include <utmp.h>
                     42: #include <stdio.h>
                     43: #include <string.h>
                     44: #include <unistd.h>
                     45:
                     46: int    _logname_valid;         /* known to setlogin() */
                     47:
                     48: char *
                     49: getlogin()
                     50: {
                     51:        static char logname[MAXLOGNAME + 1];
                     52:
                     53:        if (_logname_valid == 0) {
                     54:                if (_getlogin(logname, sizeof(logname) - 1) < 0)
                     55:                        return ((char *)NULL);
                     56:                _logname_valid = 1;
                     57:        }
                     58:        return (*logname ? logname : (char *)NULL);
                     59: }
                     60:
                     61: char *
                     62: cuserid(s)
                     63:        char *s;
                     64: {
                     65:        register struct passwd *pwd;
                     66:
                     67:        if ((pwd = getpwuid(geteuid())) == NULL) {
                     68:                if (s)
                     69:                        *s = '\0';
                     70:                return (s);
                     71:        }
                     72:        if (s) {
                     73:                (void)strncpy(s, pwd->pw_name, L_cuserid);
                     74:                return (s);
                     75:        }
                     76:        return (pwd->pw_name);
                     77: }