new copyright notice

[unix-history] / usr / src / lib / libc / gen / getlogin.c

/*
* Copyright (c) 1988 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getlogin.c  5.7 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <stdio.h>
#include <pwd.h>
#include <utmp.h>

int     _logname_valid;         /* known to setlogin() */

char *
getlogin()
{
       static char logname[UT_NAMESIZE+1];

       if (_logname_valid == 0) {
               if (_getlogin(logname, sizeof(logname) - 1) < 0)
                       return ((char *)NULL);
               _logname_valid = 1;
       }
       return (*logname ? logname : (char *)NULL);
}

uid_t   geteuid();

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);
}