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