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6ec2e0f5 SDJ |
1 | /* Provide a working getlogin_r for systems which lack it. |
2 | ||
5e8754f9 | 3 | Copyright (C) 2005-2007, 2010-2016 Free Software Foundation, Inc. |
6ec2e0f5 SDJ |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3, or (at your option) | |
8 | any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
5e8754f9 | 16 | along with this program; if not, see <http://www.gnu.org/licenses/>. */ |
6ec2e0f5 SDJ |
17 | |
18 | /* Written by Paul Eggert, Derek Price, and Bruno Haible. */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | /* Specification. */ | |
23 | #include <unistd.h> | |
24 | ||
25 | #include <errno.h> | |
26 | #include <string.h> | |
27 | ||
5e8754f9 | 28 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
6ec2e0f5 SDJ |
29 | # define WIN32_LEAN_AND_MEAN |
30 | # include <windows.h> | |
31 | #else | |
32 | # if !HAVE_DECL_GETLOGIN | |
33 | extern char *getlogin (void); | |
34 | # endif | |
35 | #endif | |
36 | ||
37 | /* See unistd.in.h for documentation. */ | |
38 | int | |
39 | getlogin_r (char *name, size_t size) | |
40 | { | |
41 | #undef getlogin_r | |
5e8754f9 | 42 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
6ec2e0f5 SDJ |
43 | /* Native Windows platform. */ |
44 | DWORD sz; | |
45 | ||
46 | /* When size > 0x7fff, the doc says that GetUserName will fail. | |
47 | Actually, on Windows XP SP3, it succeeds. But let's be safe, | |
48 | for the sake of older Windows versions. */ | |
49 | if (size > 0x7fff) | |
50 | size = 0x7fff; | |
51 | sz = size; | |
52 | if (!GetUserName (name, &sz)) | |
53 | { | |
54 | if (GetLastError () == ERROR_INSUFFICIENT_BUFFER) | |
55 | /* In this case, the doc says that sz contains the required size, but | |
56 | actually, on Windows XP SP3, it contains 2 * the required size. */ | |
57 | return ERANGE; | |
58 | else | |
59 | return ENOENT; | |
60 | } | |
61 | return 0; | |
62 | #elif HAVE_GETLOGIN_R | |
63 | /* Platform with a getlogin_r() function. */ | |
64 | int ret = getlogin_r (name, size); | |
65 | ||
5e8754f9 SDJ |
66 | if (ret == 0 && memchr (name, '\0', size) == NULL) |
67 | /* name contains a truncated result. */ | |
68 | return ERANGE; | |
6ec2e0f5 SDJ |
69 | return ret; |
70 | #else | |
71 | /* Platform with a getlogin() function. */ | |
72 | char *n; | |
73 | size_t nlen; | |
74 | ||
75 | errno = 0; | |
76 | n = getlogin (); | |
77 | if (!n) | |
78 | /* ENOENT is a reasonable errno value if getlogin returns NULL. */ | |
79 | return (errno != 0 ? errno : ENOENT); | |
80 | ||
81 | nlen = strlen (n); | |
82 | if (size <= nlen) | |
83 | return ERANGE; | |
84 | memcpy (name, n, nlen + 1); | |
85 | return 0; | |
86 | #endif | |
87 | } |