util-src/windows.c

/* Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

-- 

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

*/

/*

* windows.c

* Windows support functions for Lua

*/

#include <stdio.h>

#include <windows.h>

#include <windns.h>

#include "lua.h"

#include "lauxlib.h"

static int Lget_nameservers(lua_State *L) {

	char stack_buffer[1024]; // stack allocated buffer

	IP4_ARRAY* ips = (IP4_ARRAY*) stack_buffer;

	DWORD len = sizeof(stack_buffer);

	DNS_STATUS status;

	status = DnsQueryConfig(DnsConfigDnsServerList, FALSE, NULL, NULL, ips, &len);

	if (status == 0) {

		DWORD i;

		lua_createtable(L, ips->AddrCount, 0);

		for (i = 0; i < ips->AddrCount; i++) {

			DWORD ip = ips->AddrArray[i];

			char ip_str[16] = "";

			sprintf_s(ip_str, sizeof(ip_str), "%d.%d.%d.%d", (ip >> 0) & 255, (ip >> 8) & 255, (ip >> 16) & 255, (ip >> 24) & 255);

			lua_pushstring(L, ip_str);

			lua_rawseti(L, -2, i+1);

		}

		return 1;

	} else {

		luaL_error(L, "DnsQueryConfig returned %d", status);

		return 0; // unreachable, but prevents a compiler warning

	}

}

static void lassert(lua_State *L, BOOL test, char* string) {

	if (!test) {

		luaL_error(L, "%s: %d", string, GetLastError());

	}

}

static int Lget_consolecolor(lua_State *L) {

	HWND console = GetStdHandle(STD_OUTPUT_HANDLE);

	WORD color; DWORD read_len;

	CONSOLE_SCREEN_BUFFER_INFO info;

	lassert(L, console != INVALID_HANDLE_VALUE, "GetStdHandle");

	lassert(L, GetConsoleScreenBufferInfo(console, &info), "GetConsoleScreenBufferInfo");

	lassert(L, ReadConsoleOutputAttribute(console, &color, sizeof(WORD), info.dwCursorPosition, &read_len), "ReadConsoleOutputAttribute");

	lua_pushnumber(L, color);

	return 1;

}

static int Lset_consolecolor(lua_State *L) {

	int color = luaL_checkint(L, 1);

	HWND console = GetStdHandle(STD_OUTPUT_HANDLE);

	lassert(L, console != INVALID_HANDLE_VALUE, "GetStdHandle");

	lassert(L, SetConsoleTextAttribute(console, color), "SetConsoleTextAttribute");

	return 0;

}

static const luaL_Reg Reg[] =

{

	{ "get_nameservers",	Lget_nameservers	},

	{ "get_consolecolor",	Lget_consolecolor	},

	{ "set_consolecolor",	Lset_consolecolor	},

	{ NULL,		NULL	}

};

LUALIB_API int luaopen_util_windows(lua_State *L) {

	luaL_register(L, "windows", Reg);

	lua_pushliteral(L, "version");			/** version */

	lua_pushliteral(L, "-3.14");

	lua_settable(L,-3);

	return 1;

}