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28f540f4 RM |
1 | /* Copyright (C) 1991 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
19 | #include <ansidecl.h> | |
20 | #include <stdio.h> | |
21 | #include <string.h> | |
22 | #include <pwd.h> | |
23 | ||
24 | extern int EXFUN(geteuid, (NOARGS)); | |
25 | ||
26 | ||
27 | /* Return the username of the caller. | |
28 | If S is not NULL, it points to a buffer of at least L_cuserid bytes | |
29 | into which the name is copied; otherwise, a static buffer is used. */ | |
30 | char * | |
31 | DEFUN(cuserid, (s), char *s) | |
32 | { | |
33 | static char name[L_cuserid]; | |
34 | struct passwd *pwent = getpwuid(geteuid()); | |
35 | ||
36 | if (pwent == NULL) | |
37 | { | |
38 | if (s != NULL) | |
39 | s[0] = '\0'; | |
40 | return NULL; | |
41 | } | |
42 | ||
43 | if (s == NULL) | |
44 | s = name; | |
45 | return strcpy(s, pwent->pw_name); | |
46 | } |