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121ce6e5 DJ |
1 | /* Host support routines for MinGW, for GDB, the GNU debugger. |
2 | ||
3 | Copyright (C) 2006 | |
4 | Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
21 | Boston, MA 02110-1301, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | ||
25 | #include "gdb_string.h" | |
26 | ||
27 | #include <windows.h> | |
28 | ||
29 | /* The strerror() function can return NULL for errno values that are | |
30 | out of range. Provide a "safe" version that always returns a | |
31 | printable string. | |
32 | ||
33 | The Windows runtime implementation of strerror never returns NULL, | |
34 | but does return a useless string for anything above sys_nerr; | |
35 | unfortunately this includes all socket-related error codes. | |
36 | This replacement tries to find a system-provided error message. */ | |
37 | ||
38 | char * | |
39 | safe_strerror (int errnum) | |
40 | { | |
41 | static char *buffer; | |
42 | int len; | |
43 | ||
44 | if (errnum >= 0 && errnum < sys_nerr) | |
45 | return strerror (errnum); | |
46 | ||
47 | if (buffer) | |
48 | { | |
49 | LocalFree (buffer); | |
50 | buffer = NULL; | |
51 | } | |
52 | ||
53 | if (FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER | |
54 | | FORMAT_MESSAGE_FROM_SYSTEM, | |
55 | NULL, errnum, | |
56 | MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), | |
57 | (LPTSTR) &buffer, 0, NULL) == 0) | |
58 | { | |
59 | static char buf[32]; | |
60 | xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum); | |
61 | return buf; | |
62 | } | |
63 | ||
64 | /* Windows error messages end with a period and a CR-LF; strip that | |
65 | out. */ | |
66 | len = strlen (buffer); | |
67 | if (len > 3 && strcmp (buffer + len - 3, ".\r\n") == 0) | |
68 | buffer[len - 3] = '\0'; | |
69 | ||
70 | return buffer; | |
71 | } |