GRASS GIS 8 Programmer's Manual 8.2.1(2023)-exported
whoami.c
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1/*!
2 * \file lib/gis/whoami.c
3 *
4 * \brief GIS Library - Login name functions.
5 *
6 * (C) 2001-2009 by the GRASS Development Team
7 *
8 * This program is free software under the GNU General Public License
9 * (>=v2). Read the file COPYING that comes with GRASS for details.
10 *
11 * \author Original author CERL
12 */
13
14#include <unistd.h>
15#include <stdlib.h>
16
17#ifndef __MINGW32__
18#include <pwd.h>
19#endif
20
21#include <grass/gis.h>
22
23/*!
24 * \brief Gets user's name.
25 *
26 * Returns a pointer to a string containing the user's login name.
27 *
28 * Tries getlogin() first, then goes to the password file.
29 * However, some masscomp getlogin() fails in ucb universe
30 * because the ttyname(0) rotuine fails in ucb universe.
31 * So we check for this, too.
32 *
33 * \return pointer to string ("anonymous" by default)
34 */
35const char *G_whoami(void)
36{
37 static int initialized;
38 static const char *name;
39
40 if (G_is_initialized(&initialized))
41 return name;
42
43#ifdef __MINGW32__
44 name = getenv("USERNAME");
45#endif
46 if (!name || !*name)
47 name = getenv("LOGNAME");
48
49 if (!name || !*name)
50 name = getenv("USER");
51
52#ifndef __MINGW32__
53 if (!name || !*name) {
54 struct passwd *p = getpwuid(getuid());
55 if (p && p->pw_name && *p->pw_name)
56 name = G_store(p->pw_name);
57 }
58#endif
59
60 if (!name || !*name)
61 name = "anonymous";
62
63 G_initialize_done(&initialized);
64
65 return name;
66}
void G_initialize_done(int *p)
Definition: counter.c:76
int G_is_initialized(int *p)
Definition: counter.c:59
const char * name
Definition: named_colr.c:7
char * G_store(const char *s)
Copy string to allocated memory.
Definition: strings.c:87
const char * G_whoami(void)
Gets user's name.
Definition: whoami.c:35