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Annotation of 43BSDReno/lib/libc/gen/getlogin.c, revision 1.1.1.1

1.1       root        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 provided
                      6:  * that: (1) source distributions retain this entire copyright notice and
                      7:  * comment, and (2) distributions including binaries display the following
                      8:  * acknowledgement:  ``This product includes software developed by the
                      9:  * University of California, Berkeley and its contributors'' in the
                     10:  * documentation or other materials provided with the distribution and in
                     11:  * all advertising materials mentioning features or use of this software.
                     12:  * Neither the name of the University nor the names of its contributors may
                     13:  * be used to endorse or promote products derived from this software without
                     14:  * specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)getlogin.c 5.8 (Berkeley) 6/24/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/param.h>
                     25: #include <stdio.h>
                     26: #include <pwd.h>
                     27: #include <utmp.h>
                     28: 
                     29: int    _logname_valid;         /* known to setlogin() */
                     30: 
                     31: char *
                     32: getlogin()
                     33: {
                     34:        static char logname[MAXLOGNAME + 1];
                     35: 
                     36:        if (_logname_valid == 0) {
                     37:                if (_getlogin(logname, sizeof(logname) - 1) < 0)
                     38:                        return ((char *)NULL);
                     39:                _logname_valid = 1;
                     40:        }
                     41:        return (*logname ? logname : (char *)NULL);
                     42: }
                     43: 
                     44: uid_t  geteuid();
                     45: 
                     46: char *
                     47: cuserid(s)
                     48:        char *s;
                     49: {
                     50:        register struct passwd *pwd;
                     51: 
                     52:        if ((pwd = getpwuid(geteuid())) == NULL) {
                     53:                if (s)
                     54:                        *s = '\0';
                     55:                return (s);
                     56:        }
                     57:        if (s) {
                     58:                (void)strncpy(s, pwd->pw_name, L_cuserid);
                     59:                return (s);
                     60:        }
                     61:        return (pwd->pw_name);
                     62: }

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