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fb23d554 SDJ |
1 | /* Safe version of strerror for MinGW, for GDB, the GNU debugger. |
2 | ||
618f726f | 3 | Copyright (C) 2006-2016 Free Software Foundation, Inc. |
fb23d554 SDJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "common-defs.h" | |
21 | ||
22 | #include <windows.h> | |
23 | ||
24 | /* Implementation of safe_strerror as defined in common-utils.h. | |
25 | ||
26 | The Windows runtime implementation of strerror never returns NULL, | |
27 | but does return a useless string for anything above sys_nerr; | |
28 | unfortunately this includes all socket-related error codes. | |
29 | This replacement tries to find a system-provided error message. */ | |
30 | ||
31 | char * | |
32 | safe_strerror (int errnum) | |
33 | { | |
34 | static char *buffer; | |
35 | int len; | |
36 | ||
37 | if (errnum >= 0 && errnum < sys_nerr) | |
38 | return strerror (errnum); | |
39 | ||
40 | if (buffer) | |
41 | { | |
42 | LocalFree (buffer); | |
43 | buffer = NULL; | |
44 | } | |
45 | ||
46 | if (FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER | |
47 | | FORMAT_MESSAGE_FROM_SYSTEM, | |
48 | NULL, errnum, | |
49 | MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), | |
50 | (LPTSTR) &buffer, 0, NULL) == 0) | |
51 | { | |
52 | static char buf[32]; | |
53 | xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum); | |
54 | return buf; | |
55 | } | |
56 | ||
57 | /* Windows error messages end with a period and a CR-LF; strip that | |
58 | out. */ | |
59 | len = strlen (buffer); | |
60 | if (len > 3 && strcmp (buffer + len - 3, ".\r\n") == 0) | |
61 | buffer[len - 3] = '\0'; | |
62 | ||
63 | return buffer; | |
64 | } |