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mingw-strerror.c
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1 /* Safe version of strerror for MinGW, for GDB, the GNU debugger.
2 
3  Copyright (C) 2006-2015 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 }
char * safe_strerror(int errnum)
int xsnprintf(char *str, size_t size, const char *format,...)
Definition: common-utils.c:134
Definition: buffer.h:23
char * strerror(int)