projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 05e7d7bc KF |
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 | |
| 6 | * provided that the above copyright notice and this paragraph are | |
| 7 | * duplicated in all such forms and that any documentation, | |
| 8 | * advertising materials, and other materials related to such | |
| 9 | * distribution and use acknowledge that the software was developed | |
| 10 | * by the University of California, Berkeley. The name of the | |
| 11 | * University may not be used to endorse or promote products derived | |
| 12 | * from this software without specific prior written permission. | |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
| 16 | */ | |
| 17 | ||
| 2ce81398 | 18 | #if defined(LIBC_SCCS) && !defined(lint) |
| e24b3d64 | 19 | static char sccsid[] = "@(#)getlogin.c 5.6 (Berkeley) %G%"; |
| 05e7d7bc | 20 | #endif /* LIBC_SCCS and not lint */ |
| 056d5bbd | 21 | |
| 05e7d7bc KF |
22 | #include <sys/types.h> |
| 23 | #include <stdio.h> | |
| 24 | #include <pwd.h> | |
| d144c87e SL |
25 | #include <utmp.h> |
| 26 | ||
| e24b3d64 | 27 | int _logname_valid; /* known to setlogin() */ |
| d144c87e SL |
28 | |
| 29 | char * | |
| 30 | getlogin() | |
| 31 | { | |
| e24b3d64 | 32 | static char logname[UT_NAMESIZE+1]; |
| 05e7d7bc | 33 | |
| e24b3d64 MK |
34 | if (_logname_valid == 0) { |
| 35 | if (_getlogin(logname, sizeof(logname) - 1) < 0) | |
| 36 | return ((char *)NULL); | |
| 37 | _logname_valid = 1; | |
| 05e7d7bc | 38 | } |
| e24b3d64 | 39 | return (*logname ? logname : (char *)NULL); |
| 05e7d7bc KF |
40 | } |
| 41 | ||
| 42 | uid_t geteuid(); | |
| 43 | ||
| 44 | char * | |
| 45 | cuserid(s) | |
| e24b3d64 | 46 | char *s; |
| 05e7d7bc KF |
47 | { |
| 48 | register struct passwd *pwd; | |
| 49 | ||
| e658abae KB |
50 | if ((pwd = getpwuid(geteuid())) == NULL) { |
| 51 | if (s) | |
| 05e7d7bc | 52 | *s = '\0'; |
| e24b3d64 | 53 | return (s); |
| 05e7d7bc | 54 | } |
| e658abae KB |
55 | if (s) { |
| 56 | (void)strncpy(s, pwd->pw_name, L_cuserid); | |
| e24b3d64 | 57 | return (s); |
| 056d5bbd | 58 | } |
| e24b3d64 | 59 | return (pwd->pw_name); |
| d144c87e | 60 | } |