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ec4b0518 | 1 | /* Copyright (C) 1991, 1996 Free Software Foundation, Inc. |
28f540f4 RM |
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 | ||
cccda09f | 19 | #include <pwd.h> |
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20 | #include <stdio.h> |
21 | #include <string.h> | |
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22 | #include <unistd.h> |
23 | #include <sys/types.h> | |
28f540f4 | 24 | |
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25 | /* Return the username of the caller. |
26 | If S is not NULL, it points to a buffer of at least L_cuserid bytes | |
27 | into which the name is copied; otherwise, a static buffer is used. */ | |
28 | char * | |
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29 | cuserid (s) |
30 | char *s; | |
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31 | { |
32 | static char name[L_cuserid]; | |
ec4b0518 | 33 | struct passwd *pwent = getpwuid (geteuid ()); |
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34 | |
35 | if (pwent == NULL) | |
36 | { | |
37 | if (s != NULL) | |
38 | s[0] = '\0'; | |
39 | return NULL; | |
40 | } | |
41 | ||
42 | if (s == NULL) | |
43 | s = name; | |
ec4b0518 | 44 | return strcpy (s, pwent->pw_name); |
28f540f4 | 45 | } |