/* Error handling for Windows
Copyright (C) 1996-2012 Free Software Foundation, Inc.
This file is part of GNU Make.

GNU Make 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.

GNU Make 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 <stdlib.h>
#include <windows.h>
#include "make.h"
#include "w32err.h"

/*
 * Description: the windows32 version of perror()
 *
 * Returns:  a pointer to a static error
 *
 * Notes/Dependencies:  I got this from
 *      comp.os.ms-windows.programmer.win32
 */
const char *
map_windows32_error_to_string (DWORD ercode) {
/*
 * We used to have an MSVC-specific '__declspec (thread)' qualifier
 * here, with the following comment:
 *
 * __declspec (thread) necessary if you will use multiple threads on MSVC
 *
 * However, Make was never multithreaded on Windows (except when
 * Ctrl-C is hit, in which case the main thread is stopped
 * immediately, so it doesn't matter in this context).  The functions
 * on sub_proc.c that started and stopped additional threads were
 * never used, and are now #ifdef'ed away.  Until we need more than
 * one thread, we have no problems with the following buffer being
 * static.  (If and when we do need it to be in thread-local storage,
 * the corresponding GCC qualifier is '__thread'.)
 */
    static char szMessageBuffer[128];
	/* Fill message buffer with a default message in
	 * case FormatMessage fails
	 */
    wsprintf (szMessageBuffer, "Error %ld\n", ercode);

	/*
	 *  Special code for winsock error handling.
	 */
	if (ercode > WSABASEERR) {
#if 0
		HMODULE hModule = GetModuleHandle("wsock32");
		if (hModule != NULL) {
			FormatMessage(FORMAT_MESSAGE_FROM_HMODULE,
				hModule,
				ercode,
				LANG_NEUTRAL,
				szMessageBuffer,
				sizeof(szMessageBuffer),
				NULL);
			FreeLibrary(hModule);
		}
#else
		fatal(NILF, szMessageBuffer);
#endif
	} else {
		/*
		 *  Default system message handling
		 */
    	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,
                  NULL,
                  ercode,
                  LANG_NEUTRAL,
                  szMessageBuffer,
                  sizeof(szMessageBuffer),
                  NULL);
	}
    return szMessageBuffer;
}