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d4697bc9 | 1 | /* Copyright (C) 1991-2014 Free Software Foundation, Inc. |
2c6fe0bd | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
2c6fe0bd | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 8 | |
2c6fe0bd UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
cccda09f | 18 | #include <pwd.h> |
28f540f4 RM |
19 | #include <stdio.h> |
20 | #include <string.h> | |
cccda09f UD |
21 | #include <unistd.h> |
22 | #include <sys/types.h> | |
28f540f4 | 23 | |
28f540f4 RM |
24 | /* Return the username of the caller. |
25 | If S is not NULL, it points to a buffer of at least L_cuserid bytes | |
26 | into which the name is copied; otherwise, a static buffer is used. */ | |
27 | char * | |
ec4b0518 UD |
28 | cuserid (s) |
29 | char *s; | |
28f540f4 RM |
30 | { |
31 | static char name[L_cuserid]; | |
2c6fe0bd UD |
32 | char buf[NSS_BUFLEN_PASSWD]; |
33 | struct passwd pwent; | |
34 | struct passwd *pwptr; | |
28f540f4 | 35 | |
c5f57c58 UD |
36 | if (__getpwuid_r (__geteuid (), &pwent, buf, sizeof (buf), &pwptr) |
37 | || pwptr == NULL) | |
28f540f4 RM |
38 | { |
39 | if (s != NULL) | |
40 | s[0] = '\0'; | |
9b63f5b4 | 41 | return s; |
28f540f4 RM |
42 | } |
43 | ||
44 | if (s == NULL) | |
45 | s = name; | |
34b514df | 46 | s[L_cuserid - 1] = '\0'; |
fd8ccb04 | 47 | return strncpy (s, pwptr->pw_name, L_cuserid - 1); |
28f540f4 | 48 | } |