GDB (xrefs)

mingw-strerror.c
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1 /* Safe version of strerror for MinGW, for GDB, the GNU debugger.
2
3 Copyright (C) 2006-2018 Free Software Foundation, Inc.
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 }
safe_strerror
char * safe_strerror(int errnum)
Definition: mingw-strerror.c:32
common-defs.h
xsnprintf
int xsnprintf(char *str, size_t size, const char *format,...)
Definition: common-utils.c:134
buffer
Definition: buffer.h:23