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/* Safe version of strerror for MinGW, for GDB, the GNU debugger.
Copyright (C) 2006-2019 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "common-defs.h"
#include <windows.h>
/* Implementation of safe_strerror as defined in common-utils.h.
The Windows runtime implementation of strerror never returns NULL,
but does return a useless string for anything above sys_nerr;
unfortunately this includes all socket-related error codes.
This replacement tries to find a system-provided error message. */
char *
safe_strerror (int errnum)
{
static char *buffer;
int len;
if (errnum >= 0 && errnum < sys_nerr)
return strerror (errnum);
if (buffer)
{
LocalFree (buffer);
buffer = NULL;
}
if (FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM,
NULL, errnum,
MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &buffer, 0, NULL) == 0)
{
static char buf[32];
xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum);
return buf;
}
/* Windows error messages end with a period and a CR-LF; strip that
out. */
len = strlen (buffer);
if (len > 3 && strcmp (buffer + len - 3, ".\r\n") == 0)
buffer[len - 3] = '\0';
return buffer;
}
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