Robert de Bath has a better alternative to revs 1.47/48 [r582,r583];

[sgt/putty] / window.c

#include <windows.h>
#include <commctrl.h>
#ifndef AUTO_WINSOCK
#ifdef WINSOCK_TWO
#include <winsock2.h>
#else
#include <winsock.h>
#endif
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

#define PUTTY_DO_GLOBALS		       /* actually _define_ globals */
#include "putty.h"
#include "win_res.h"

#define IDM_SHOWLOG   0x0010
#define IDM_NEWSESS   0x0020
#define IDM_DUPSESS   0x0030
#define IDM_RECONF    0x0040
#define IDM_CLRSB     0x0050
#define IDM_RESET     0x0060
#define IDM_TEL_AYT   0x0070
#define IDM_TEL_BRK   0x0080
#define IDM_TEL_SYNCH 0x0090
#define IDM_TEL_EC    0x00a0
#define IDM_TEL_EL    0x00b0
#define IDM_TEL_GA    0x00c0
#define IDM_TEL_NOP   0x00d0
#define IDM_TEL_ABORT 0x00e0
#define IDM_TEL_AO    0x00f0
#define IDM_TEL_IP    0x0100
#define IDM_TEL_SUSP  0x0110
#define IDM_TEL_EOR   0x0120
#define IDM_TEL_EOF   0x0130
#define IDM_ABOUT     0x0140
#define IDM_SAVEDSESS 0x0150

#define IDM_SAVED_MIN 0x1000
#define IDM_SAVED_MAX 0x2000

#define WM_IGNORE_SIZE (WM_XUSER + 1)
#define WM_IGNORE_CLIP (WM_XUSER + 2)

static LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
static int TranslateKey(UINT message, WPARAM wParam, LPARAM lParam, unsigned char *output);
static void cfgtopalette(void);
static void init_palette(void);
static void init_fonts(int);

static int extra_width, extra_height;

static int pending_netevent = 0;
static WPARAM pend_netevent_wParam = 0;
static LPARAM pend_netevent_lParam = 0;
static void enact_pending_netevent(void);

#define FONT_NORMAL 0
#define FONT_BOLD 1
#define FONT_UNDERLINE 2
#define FONT_BOLDUND 3
#define FONT_OEM 4
#define FONT_OEMBOLD 5
#define FONT_OEMBOLDUND 6
#define FONT_OEMUND 7
static HFONT fonts[8];
static int font_needs_hand_underlining;
static enum {
    BOLD_COLOURS, BOLD_SHADOW, BOLD_FONT
} bold_mode;
static enum {
    UND_LINE, UND_FONT
} und_mode;
static int descent;

#define NCOLOURS 24
static COLORREF colours[NCOLOURS];
static HPALETTE pal;
static LPLOGPALETTE logpal;
static RGBTRIPLE defpal[NCOLOURS];

static HWND hwnd;

static int dbltime, lasttime, lastact;
static Mouse_Button lastbtn;

static char *window_name, *icon_name;

static Ldisc *real_ldisc;

void begin_session(void) {
    ldisc = real_ldisc;
}

int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
    static char appname[] = "PuTTY";
    WORD winsock_ver;
    WSADATA wsadata;
    WNDCLASS wndclass;
    MSG msg;
    int guess_width, guess_height;

    putty_inst = inst;
    flags = FLAG_VERBOSE | FLAG_INTERACTIVE;

    winsock_ver = MAKEWORD(1, 1);
    if (WSAStartup(winsock_ver, &wsadata)) {
	MessageBox(NULL, "Unable to initialise WinSock", "WinSock Error",
		   MB_OK | MB_ICONEXCLAMATION);
	return 1;
    }
    if (LOBYTE(wsadata.wVersion) != 1 || HIBYTE(wsadata.wVersion) != 1) {
	MessageBox(NULL, "WinSock version is incompatible with 1.1",
		   "WinSock Error", MB_OK | MB_ICONEXCLAMATION);
	WSACleanup();
	return 1;
    }
    /* WISHLIST: maybe allow config tweaking even if winsock not present? */

    InitCommonControls();

    /*
     * Process the command line.
     */
    {
	char *p;

	default_protocol = DEFAULT_PROTOCOL;
	default_port = DEFAULT_PORT;

	do_defaults(NULL);

	p = cmdline;
	while (*p && isspace(*p)) p++;

	/*
	 * Process command line options first. Yes, this can be
	 * done better, and it will be as soon as I have the
	 * energy...
	 */
	while (*p == '-') {
	    char *q = p + strcspn(p, " \t");
	    p++;
	    if (q == p + 3 &&
		tolower(p[0]) == 's' &&
		tolower(p[1]) == 's' &&
		tolower(p[2]) == 'h') {
		default_protocol = cfg.protocol = PROT_SSH;
		default_port = cfg.port = 22;
	    } else if (q == p + 3 &&
		tolower(p[0]) == 'l' &&
		tolower(p[1]) == 'o' &&
		tolower(p[2]) == 'g') {
                logfile = "putty.log";
	    }
	    p = q + strspn(q, " \t");
	}

	/*
	 * An initial @ means to activate a saved session.
	 */
	if (*p == '@') {
	    do_defaults (p+1);
	    if (!*cfg.host && !do_config()) {
		WSACleanup();
		return 0;
	    }
	} else if (*p == '&') {
	    /*
	     * An initial & means we've been given a command line
	     * containing the hex value of a HANDLE for a file
	     * mapping object, which we must then extract as a
	     * config.
	     */
	    HANDLE filemap;
	    Config *cp;
	    if (sscanf(p+1, "%p", &filemap) == 1 &&
		(cp = MapViewOfFile(filemap, FILE_MAP_READ,
				    0, 0, sizeof(Config))) != NULL) {
		cfg = *cp;
		UnmapViewOfFile(cp);
		CloseHandle(filemap);
	    } else if (!do_config()) {
		WSACleanup();
		return 0;
	    }
	} else if (*p) {
	    char *q = p;
            /*
             * If the hostname starts with "telnet:", set the
             * protocol to Telnet and process the string as a
             * Telnet URL.
             */
            if (!strncmp(q, "telnet:", 7)) {
                char c;

                q += 7;
		if (q[0] == '/' && q[1] == '/')
		    q += 2;
                cfg.protocol = PROT_TELNET;
                p = q;
                while (*p && *p != ':' && *p != '/') p++;
                c = *p;
                if (*p)
                    *p++ = '\0';
                if (c == ':')
                    cfg.port = atoi(p);
                else
                    cfg.port = -1;
                strncpy (cfg.host, q, sizeof(cfg.host)-1);
                cfg.host[sizeof(cfg.host)-1] = '\0';
            } else {
                while (*p && !isspace(*p)) p++;
                if (*p)
                    *p++ = '\0';
                strncpy (cfg.host, q, sizeof(cfg.host)-1);
                cfg.host[sizeof(cfg.host)-1] = '\0';
                while (*p && isspace(*p)) p++;
                if (*p)
                    cfg.port = atoi(p);
                else
                    cfg.port = -1;
            }
	} else {
	    if (!do_config()) {
		WSACleanup();
		return 0;
	    }
	}

	/* See if host is of the form user@host */
	if (cfg.host[0] != '\0') {
	    char *atsign = strchr(cfg.host, '@');
	    /* Make sure we're not overflowing the user field */
	    if (atsign) {
		if (atsign-cfg.host < sizeof cfg.username) {
		    strncpy (cfg.username, cfg.host, atsign-cfg.host);
		    cfg.username[atsign-cfg.host] = '\0';
		}
		memmove(cfg.host, atsign+1, 1+strlen(atsign+1));
	    }
	}
    }

    /*
     * Select protocol. This is farmed out into a table in a
     * separate file to enable an ssh-free variant.
     */
    {
        int i;
        back = NULL;
        for (i = 0; backends[i].backend != NULL; i++)
            if (backends[i].protocol == cfg.protocol) {
                back = backends[i].backend;
                break;
            }
        if (back == NULL) {
            MessageBox(NULL, "Unsupported protocol number found",
                       "PuTTY Internal Error", MB_OK | MB_ICONEXCLAMATION);
            WSACleanup();
            return 1;
        }
    }

    real_ldisc = (cfg.ldisc_term ? &ldisc_term : &ldisc_simple);
    /* To start with, we use the simple line discipline, so we can
     * type passwords etc without fear of them being echoed... */
    ldisc = &ldisc_simple;

    if (!prev) {
	wndclass.style         = 0;
	wndclass.lpfnWndProc   = WndProc;
	wndclass.cbClsExtra    = 0;
	wndclass.cbWndExtra    = 0;
	wndclass.hInstance     = inst;
	wndclass.hIcon         = LoadIcon (inst,
					   MAKEINTRESOURCE(IDI_MAINICON));
	wndclass.hCursor       = LoadCursor (NULL, IDC_IBEAM);
	wndclass.hbrBackground = GetStockObject (BLACK_BRUSH);
	wndclass.lpszMenuName  = NULL;
	wndclass.lpszClassName = appname;

	RegisterClass (&wndclass);
    }

    hwnd = NULL;

    savelines = cfg.savelines;
    term_init();

    cfgtopalette();

    /*
     * Guess some defaults for the window size. This all gets
     * updated later, so we don't really care too much. However, we
     * do want the font width/height guesses to correspond to a
     * large font rather than a small one...
     */
    
    font_width = 10;
    font_height = 20;
    extra_width = 25;
    extra_height = 28;
    term_size (cfg.height, cfg.width, cfg.savelines);
    guess_width = extra_width + font_width * cols;
    guess_height = extra_height + font_height * rows;
    {
	RECT r;
	HWND w = GetDesktopWindow();
	GetWindowRect (w, &r);
	if (guess_width > r.right - r.left)
	    guess_width = r.right - r.left;
	if (guess_height > r.bottom - r.top)
	    guess_height = r.bottom - r.top;
    }

    {
       int winmode = WS_OVERLAPPEDWINDOW|WS_VSCROLL;
       if (!cfg.scrollbar) winmode &= ~(WS_VSCROLL);
       if (cfg.locksize)   winmode &= ~(WS_THICKFRAME|WS_MAXIMIZEBOX);
       hwnd = CreateWindow (appname, appname,
			    winmode,
			    CW_USEDEFAULT, CW_USEDEFAULT,
			    guess_width, guess_height,
			    NULL, NULL, inst, NULL);
    }

    /*
     * Initialise the fonts, simultaneously correcting the guesses
     * for font_{width,height}.
     */
    bold_mode = cfg.bold_colour ? BOLD_COLOURS : BOLD_FONT;
    und_mode = UND_FONT;
    init_fonts(0);

    /*
     * Correct the guesses for extra_{width,height}.
     */
    {
	RECT cr, wr;
	GetWindowRect (hwnd, &wr);
	GetClientRect (hwnd, &cr);
	extra_width = wr.right - wr.left - cr.right + cr.left;
	extra_height = wr.bottom - wr.top - cr.bottom + cr.top;
    }

    /*
     * Resize the window, now we know what size we _really_ want it
     * to be.
     */
    guess_width = extra_width + font_width * cols;
    guess_height = extra_height + font_height * rows;
    SendMessage (hwnd, WM_IGNORE_SIZE, 0, 0);
    SetWindowPos (hwnd, NULL, 0, 0, guess_width, guess_height,
		  SWP_NOMOVE | SWP_NOREDRAW | SWP_NOZORDER);

    /*
     * Initialise the scroll bar.
     */
    {
	SCROLLINFO si;

	si.cbSize = sizeof(si);
	si.fMask = SIF_ALL | SIF_DISABLENOSCROLL;
	si.nMin = 0;
	si.nMax = rows-1;
	si.nPage = rows;
	si.nPos = 0;
	SetScrollInfo (hwnd, SB_VERT, &si, FALSE);
    }

    /*
     * Start up the telnet connection.
     */
    {
	char *error;
	char msg[1024];
	char *realhost;

	error = back->init (hwnd, cfg.host, cfg.port, &realhost);
	if (error) {
	    sprintf(msg, "Unable to open connection:\n%s", error);
	    MessageBox(NULL, msg, "PuTTY Error", MB_ICONERROR | MB_OK);
	    return 0;
	}
	window_name = icon_name = NULL;
	sprintf(msg, "%s - PuTTY", realhost);
	set_title (msg);
	set_icon (msg);
    }

    session_closed = FALSE;

    /*
     * Set up the input and output buffers.
     */
    inbuf_head = 0;
    outbuf_reap = outbuf_head = 0;

    /*
     * Prepare the mouse handler.
     */
    lastact = MA_NOTHING;
    lastbtn = MB_NOTHING;
    dbltime = GetDoubleClickTime();

    /*
     * Set up the session-control options on the system menu.
     */
    {
	HMENU m = GetSystemMenu (hwnd, FALSE);
	HMENU p,s;
	int i;

	AppendMenu (m, MF_SEPARATOR, 0, 0);
	if (cfg.protocol == PROT_TELNET) {
	    p = CreateMenu();
	    AppendMenu (p, MF_ENABLED, IDM_TEL_AYT, "Are You There");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_BRK, "Break");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_SYNCH, "Synch");
	    AppendMenu (p, MF_SEPARATOR, 0, 0);
	    AppendMenu (p, MF_ENABLED, IDM_TEL_EC, "Erase Character");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_EL, "Erase Line");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_GA, "Go Ahead");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_NOP, "No Operation");
	    AppendMenu (p, MF_SEPARATOR, 0, 0);
	    AppendMenu (p, MF_ENABLED, IDM_TEL_ABORT, "Abort Process");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_AO, "Abort Output");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_IP, "Interrupt Process");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_SUSP, "Suspend Process");
	    AppendMenu (p, MF_SEPARATOR, 0, 0);
	    AppendMenu (p, MF_ENABLED, IDM_TEL_EOR, "End Of Record");
	    AppendMenu (p, MF_ENABLED, IDM_TEL_EOF, "End Of File");
	    AppendMenu (m, MF_POPUP | MF_ENABLED, (UINT) p, "Telnet Command");
	    AppendMenu (m, MF_SEPARATOR, 0, 0);
	}
	AppendMenu (m, MF_ENABLED, IDM_SHOWLOG, "&Event Log");
	AppendMenu (m, MF_SEPARATOR, 0, 0);
	AppendMenu (m, MF_ENABLED, IDM_NEWSESS, "Ne&w Session");
	AppendMenu (m, MF_ENABLED, IDM_DUPSESS, "&Duplicate Session");
	s = CreateMenu();
	get_sesslist(TRUE);
	for (i = 1 ; i < ((nsessions < 256) ? nsessions : 256) ; i++)
	  AppendMenu (s, MF_ENABLED, IDM_SAVED_MIN + (16 * i) , sessions[i]);
	AppendMenu (m, MF_POPUP | MF_ENABLED, (UINT) s, "Sa&ved Sessions");
	AppendMenu (m, MF_ENABLED, IDM_RECONF, "Chan&ge Settings");
	AppendMenu (m, MF_SEPARATOR, 0, 0);
	AppendMenu (m, MF_ENABLED, IDM_CLRSB, "C&lear Scrollback");
	AppendMenu (m, MF_ENABLED, IDM_RESET, "Rese&t Terminal");
	AppendMenu (m, MF_SEPARATOR, 0, 0);
	AppendMenu (m, MF_ENABLED, IDM_ABOUT, "&About PuTTY");
    }

    /*
     * Finally show the window!
     */
    ShowWindow (hwnd, show);

    /*
     * Set the palette up.
     */
    pal = NULL;
    logpal = NULL;
    init_palette();

    has_focus = (GetForegroundWindow() == hwnd);
    UpdateWindow (hwnd);

    {
	int timer_id = 0, long_timer = 0;

	while (GetMessage (&msg, NULL, 0, 0) == 1) {
	    /* Sometimes DispatchMessage calls routines that use their own
	     * GetMessage loop, setup this timer so we get some control back.
	     *
	     * Also call term_update() from the timer so that if the host
	     * is sending data flat out we still do redraws.
	     */
	    if(timer_id && long_timer) {
		KillTimer(hwnd, timer_id);
		long_timer = timer_id = 0;
	    }
	    if(!timer_id)
		timer_id = SetTimer(hwnd, 1, 20, NULL);
	    DispatchMessage (&msg);

	    /* This is too fast, but I'll leave it for now 'cause it shows
	     * how often term_update is called (far too often at times!)
	     */
	    term_blink(0);

	    /* Send the paste buffer if there's anything to send */
	    term_paste();

	    /* If there's nothing new in the queue then we can do everything
	     * we've delayed, reading the socket, writing, and repainting
	     * the window.
	     */
	    if (!PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE)) {
		if (pending_netevent) {
		    enact_pending_netevent();

		    term_blink(1);
		}
	    } else continue;
	    if (!PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE)) {
		if (timer_id) {
		    KillTimer(hwnd, timer_id);
		    timer_id = 0;
		}
		if (inbuf_head)
		    term_out();
		term_update();
		if (!has_focus)
		   timer_id = SetTimer(hwnd, 1, 2000, NULL);
		else if (cfg.blinktext)
		   timer_id = SetTimer(hwnd, 1, 250, NULL);
		else
		   timer_id = SetTimer(hwnd, 1, 500, NULL);
		long_timer = 1;
	    }
	}
    }

    /*
     * Clean up.
     */
    {
	int i;
	for (i=0; i<8; i++)
	    if (fonts[i])
		DeleteObject(fonts[i]);
    }
    sfree(logpal);
    if (pal)
	DeleteObject(pal);
    WSACleanup();

    if (cfg.protocol == PROT_SSH) {
	random_save_seed();
#ifdef MSCRYPTOAPI
	crypto_wrapup();
#endif
    }

    return msg.wParam;
}

/*
 * Print a message box and close the connection.
 */
void connection_fatal(char *fmt, ...) {
    va_list ap;
    char stuff[200];

    va_start(ap, fmt);
    vsprintf(stuff, fmt, ap);
    va_end(ap);
    MessageBox(hwnd, stuff, "PuTTY Fatal Error", MB_ICONERROR | MB_OK);
    if (cfg.close_on_exit)
        PostQuitMessage(1);
    else {
        session_closed = TRUE;
        SetWindowText (hwnd, "PuTTY (inactive)");
    }
}

/*
 * Actually do the job requested by a WM_NETEVENT
 */
static void enact_pending_netevent(void) {
    int i;
    static int reentering = 0;

    if (reentering)
        return;                        /* don't unpend the pending */

    pending_netevent = FALSE;

    reentering = 1;
    i = back->msg (pend_netevent_wParam, pend_netevent_lParam);
    reentering = 0;

    if (i < 0) {
	char buf[1024];
	switch (WSABASEERR + (-i) % 10000) {
	  case WSAECONNRESET:
	    sprintf(buf, "Connection reset by peer");
	    break;
	  default:
	    sprintf(buf, "Unexpected network error %d", -i);
	    break;
	}
        connection_fatal(buf);
    }
    if (i <= 0) {
	if (cfg.close_on_exit)
	    PostQuitMessage(0);
	else {
	    session_closed = TRUE;
	    MessageBox(hwnd, "Connection closed by remote host",
		       "PuTTY", MB_OK | MB_ICONINFORMATION);
	    SetWindowText (hwnd, "PuTTY (inactive)");
	}
    }
}

/*
 * Copy the colour palette from the configuration data into defpal.
 * This is non-trivial because the colour indices are different.
 */
static void cfgtopalette(void) {
    int i;
    static const int ww[] = {
	6, 7, 8, 9, 10, 11, 12, 13,
	14, 15, 16, 17, 18, 19, 20, 21,
	0, 1, 2, 3, 4, 4, 5, 5
    };

    for (i=0; i<24; i++) {
	int w = ww[i];
	defpal[i].rgbtRed = cfg.colours[w][0];
	defpal[i].rgbtGreen = cfg.colours[w][1];
	defpal[i].rgbtBlue = cfg.colours[w][2];
    }
}

/*
 * Set up the colour palette.
 */
static void init_palette(void) {
    int i;
    HDC hdc = GetDC (hwnd);
    if (hdc) {
	if (cfg.try_palette &&
	    GetDeviceCaps (hdc, RASTERCAPS) & RC_PALETTE) {
	    logpal = smalloc(sizeof(*logpal)
			     - sizeof(logpal->palPalEntry)
			     + NCOLOURS * sizeof(PALETTEENTRY));
	    logpal->palVersion = 0x300;
	    logpal->palNumEntries = NCOLOURS;
	    for (i = 0; i < NCOLOURS; i++) {
		logpal->palPalEntry[i].peRed = defpal[i].rgbtRed;
		logpal->palPalEntry[i].peGreen = defpal[i].rgbtGreen;
		logpal->palPalEntry[i].peBlue = defpal[i].rgbtBlue;
		logpal->palPalEntry[i].peFlags = PC_NOCOLLAPSE;
	    }
	    pal = CreatePalette (logpal);
	    if (pal) {
		SelectPalette (hdc, pal, FALSE);
		RealizePalette (hdc);
		SelectPalette (hdc, GetStockObject (DEFAULT_PALETTE),
			       FALSE);
	    }
	}
	ReleaseDC (hwnd, hdc);
    }
    if (pal)
	for (i=0; i<NCOLOURS; i++)
	    colours[i] = PALETTERGB(defpal[i].rgbtRed,
				    defpal[i].rgbtGreen,
				    defpal[i].rgbtBlue);
    else
	for(i=0; i<NCOLOURS; i++)
	    colours[i] = RGB(defpal[i].rgbtRed,
			     defpal[i].rgbtGreen,
			     defpal[i].rgbtBlue);
}

/*
 * Initialise all the fonts we will need. There may be as many as
 * eight or as few as one. We also:
 *
 * - check the font width and height, correcting our guesses if
 *   necessary.
 *
 * - verify that the bold font is the same width as the ordinary
 *   one, and engage shadow bolding if not.
 * 
 * - verify that the underlined font is the same width as the
 *   ordinary one (manual underlining by means of line drawing can
 *   be done in a pinch).
 */
static void init_fonts(int pick_width) {
    TEXTMETRIC tm;
    int i;
    int fsize[8];
    HDC hdc;
    int fw_dontcare, fw_bold;
    int firstchar = ' ';

#ifdef CHECKOEMFONT
font_messup:
#endif
    for (i=0; i<8; i++)
	fonts[i] = NULL;

    if (cfg.fontisbold) {
	fw_dontcare = FW_BOLD;
	fw_bold = FW_BLACK;
   } else {
	fw_dontcare = FW_DONTCARE;
	fw_bold = FW_BOLD;
    }

    hdc = GetDC(hwnd);

    font_height = cfg.fontheight;
    font_width = pick_width;

#define f(i,c,w,u) \
    fonts[i] = CreateFont (font_height, font_width, 0, 0, w, FALSE, u, FALSE, \
			   c, OUT_DEFAULT_PRECIS, \
		           CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, \
			   FIXED_PITCH | FF_DONTCARE, cfg.font)

    if (cfg.vtmode != VT_OEMONLY) {
	f(FONT_NORMAL, cfg.fontcharset, fw_dontcare, FALSE);

	SelectObject (hdc, fonts[FONT_NORMAL]);
	GetTextMetrics(hdc, &tm); 
	font_height = tm.tmHeight;
	font_width = tm.tmAveCharWidth;

	f(FONT_UNDERLINE, cfg.fontcharset, fw_dontcare, TRUE);

        /*
         * Some fonts, e.g. 9-pt Courier, draw their underlines
         * outside their character cell. We successfully prevent
         * screen corruption by clipping the text output, but then
         * we lose the underline completely. Here we try to work
         * out whether this is such a font, and if it is, we set a
         * flag that causes underlines to be drawn by hand.
         *
         * Having tried other more sophisticated approaches (such
         * as examining the TEXTMETRIC structure or requesting the
         * height of a string), I think we'll do this the brute
         * force way: we create a small bitmap, draw an underlined
         * space on it, and test to see whether any pixels are
         * foreground-coloured. (Since we expect the underline to
         * go all the way across the character cell, we only search
         * down a single column of the bitmap, half way across.)
         */
        {
            HDC und_dc;
            HBITMAP und_bm, und_oldbm;
            int i, gotit;
            COLORREF c;

            und_dc = CreateCompatibleDC(hdc);
            und_bm = CreateCompatibleBitmap(hdc, font_width, font_height);
            und_oldbm = SelectObject(und_dc, und_bm);
            SelectObject(und_dc, fonts[FONT_UNDERLINE]);
            SetTextAlign(und_dc, TA_TOP | TA_LEFT | TA_NOUPDATECP);
            SetTextColor (und_dc, RGB(255,255,255));
            SetBkColor (und_dc, RGB(0,0,0));
            SetBkMode (und_dc, OPAQUE);
            ExtTextOut (und_dc, 0, 0, ETO_OPAQUE, NULL, " ", 1, NULL);
            gotit = FALSE;
            for (i = 0; i < font_height; i++) {
                c = GetPixel(und_dc, font_width/2, i);
                if (c != RGB(0,0,0))
                    gotit = TRUE;
            }
            SelectObject(und_dc, und_oldbm);
            DeleteObject(und_bm);
            DeleteDC(und_dc);
            font_needs_hand_underlining = !gotit;
        }

        if (bold_mode == BOLD_FONT) {
	    f(FONT_BOLD, cfg.fontcharset, fw_bold, FALSE);
	    f(FONT_BOLDUND, cfg.fontcharset, fw_bold, TRUE);
	}

        if (cfg.vtmode == VT_OEMANSI) {
	    f(FONT_OEM, OEM_CHARSET, fw_dontcare, FALSE);
	    f(FONT_OEMUND, OEM_CHARSET, fw_dontcare, TRUE);

	    if (bold_mode == BOLD_FONT) {
		f(FONT_OEMBOLD, OEM_CHARSET, fw_bold, FALSE);
		f(FONT_OEMBOLDUND, OEM_CHARSET, fw_bold, TRUE);
	    }
        }
    }
    else
    {
	f(FONT_OEM, cfg.fontcharset, fw_dontcare, FALSE);

	SelectObject (hdc, fonts[FONT_OEM]);
	GetTextMetrics(hdc, &tm); 
	font_height = tm.tmHeight;
	font_width = tm.tmAveCharWidth;

	f(FONT_OEMUND, cfg.fontcharset, fw_dontcare, TRUE);

	if (bold_mode == BOLD_FONT) {
	    f(FONT_BOLD, cfg.fontcharset, fw_bold, FALSE);
	    f(FONT_BOLDUND, cfg.fontcharset, fw_bold, TRUE);
	}
    }
#undef f

    descent = tm.tmAscent + 1;
    if (descent >= font_height)
	descent = font_height - 1;
    firstchar = tm.tmFirstChar;

    for (i=0; i<8; i++) {
	if (fonts[i]) {
	    if (SelectObject (hdc, fonts[i]) &&
	        GetTextMetrics(hdc, &tm) )
	         fsize[i] = tm.tmAveCharWidth + 256 * tm.tmHeight;
	    else fsize[i] = -i;
	}
	else fsize[i] = -i;
    }

    ReleaseDC (hwnd, hdc);

    /* ... This is wrong in OEM only mode */
    if (fsize[FONT_UNDERLINE] != fsize[FONT_NORMAL] ||
	(bold_mode == BOLD_FONT &&
	 fsize[FONT_BOLDUND] != fsize[FONT_BOLD])) {
	und_mode = UND_LINE;
	DeleteObject (fonts[FONT_UNDERLINE]);
	if (bold_mode == BOLD_FONT)
	    DeleteObject (fonts[FONT_BOLDUND]);
    }

    if (bold_mode == BOLD_FONT &&
	fsize[FONT_BOLD] != fsize[FONT_NORMAL]) {
	bold_mode = BOLD_SHADOW;
	DeleteObject (fonts[FONT_BOLD]);
	if (und_mode == UND_FONT)
	    DeleteObject (fonts[FONT_BOLDUND]);
    }

#ifdef CHECKOEMFONT
    /* With the fascist font painting it doesn't matter if the linedraw font
     * isn't exactly the right size anymore so we don't have to check this.
     */
    if (cfg.vtmode == VT_OEMANSI && fsize[FONT_OEM] != fsize[FONT_NORMAL] ) {
	if( cfg.fontcharset == OEM_CHARSET )
	{
	    MessageBox(NULL, "The OEM and ANSI versions of this font are\n"
		   "different sizes. Using OEM-only mode instead",
		   "Font Size Mismatch", MB_ICONINFORMATION | MB_OK);
	    cfg.vtmode = VT_OEMONLY;
	}
	else if( firstchar < ' ' )
	{
	    MessageBox(NULL, "The OEM and ANSI versions of this font are\n"
		   "different sizes. Using XTerm mode instead",
		   "Font Size Mismatch", MB_ICONINFORMATION | MB_OK);
	    cfg.vtmode = VT_XWINDOWS;
	}
	else
	{
	    MessageBox(NULL, "The OEM and ANSI versions of this font are\n"
		   "different sizes. Using ISO8859-1 mode instead",
		   "Font Size Mismatch", MB_ICONINFORMATION | MB_OK);
	    cfg.vtmode = VT_POORMAN;
	}

	for (i=0; i<8; i++)
	    if (fonts[i])
		DeleteObject (fonts[i]);
	goto font_messup;
    }
#endif
}

void request_resize (int w, int h, int refont) {
    int width, height;

    /* If the window is maximized supress resizing attempts */
    if(IsZoomed(hwnd)) return;
    
#ifdef CHECKOEMFONT
    /* Don't do this in OEMANSI, you may get disable messages */
    if (refont && w != cols && (cols==80 || cols==132)
	  && cfg.vtmode != VT_OEMANSI)
#else
    if (refont && w != cols && (cols==80 || cols==132))
#endif
    {
       /* If font width too big for screen should we shrink the font more ? */
        if (w==132)
            font_width = ((font_width*cols+w/2)/w);
        else
	    font_width = 0;
	{
	    int i;
	    for (i=0; i<8; i++)
		if (fonts[i])
		    DeleteObject(fonts[i]);
	}
        bold_mode = cfg.bold_colour ? BOLD_COLOURS : BOLD_FONT;
        und_mode = UND_FONT;
        init_fonts(font_width);
    }
    else
    {
       static int first_time = 1;
       static RECT ss;

       switch(first_time)
       {
       case 1:
	     /* Get the size of the screen */
	     if (GetClientRect(GetDesktopWindow(),&ss))
		/* first_time = 0 */;
	     else { first_time = 2; break; }
       case 0:
	     /* Make sure the values are sane */
	     width  = (ss.right-ss.left-extra_width  ) / font_width;
	     height = (ss.bottom-ss.top-extra_height ) / font_height;

	     if (w>width)  w=width;
	     if (h>height) h=height;
	     if (w<15) w = 15;
	     if (h<1) w = 1;
       }
    }

    width = extra_width + font_width * w;
    height = extra_height + font_height * h;

    SetWindowPos (hwnd, NULL, 0, 0, width, height,
		  SWP_NOACTIVATE | SWP_NOCOPYBITS |
		  SWP_NOMOVE | SWP_NOZORDER);
}

static void click (Mouse_Button b, int x, int y) {
    int thistime = GetMessageTime();

    if (lastbtn == b && thistime - lasttime < dbltime) {
	lastact = (lastact == MA_CLICK ? MA_2CLK :
		   lastact == MA_2CLK ? MA_3CLK :
		   lastact == MA_3CLK ? MA_CLICK : MA_NOTHING);
    } else {
	lastbtn = b;
	lastact = MA_CLICK;
    }
    if (lastact != MA_NOTHING)
	term_mouse (b, lastact, x, y);
    lasttime = thistime;
}

static LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
                                 WPARAM wParam, LPARAM lParam) {
    HDC hdc;
    static int ignore_size = FALSE;
    static int ignore_clip = FALSE;
    static int just_reconfigged = FALSE;
    static int resizing = FALSE;

    switch (message) {
      case WM_TIMER:
	if (pending_netevent)
	    enact_pending_netevent();
	if (inbuf_head)
	    term_out();
	term_update();
	return 0;
      case WM_CREATE:
	break;
      case WM_CLOSE:
	if (!cfg.warn_on_close || session_closed ||
	    MessageBox(hwnd, "Are you sure you want to close this session?",
		       "PuTTY Exit Confirmation",
		       MB_ICONWARNING | MB_OKCANCEL) == IDOK)
	    DestroyWindow(hwnd);
	return 0;
      case WM_DESTROY:
	PostQuitMessage (0);
	return 0;
      case WM_SYSCOMMAND:
	switch (wParam & ~0xF) {       /* low 4 bits reserved to Windows */
	  case IDM_SHOWLOG:
	    showeventlog(hwnd);
	    break;
	  case IDM_NEWSESS:
	  case IDM_DUPSESS:
	  case IDM_SAVEDSESS:
	    {
		char b[2048];
		char c[30], *cl;
		int freecl = FALSE;
		STARTUPINFO si;
		PROCESS_INFORMATION pi;
		HANDLE filemap = NULL;

		if (wParam == IDM_DUPSESS) {
		    /*
		     * Allocate a file-mapping memory chunk for the
		     * config structure.
		     */
		    SECURITY_ATTRIBUTES sa;
		    Config *p;

		    sa.nLength = sizeof(sa);
		    sa.lpSecurityDescriptor = NULL;
		    sa.bInheritHandle = TRUE;
		    filemap = CreateFileMapping((HANDLE)0xFFFFFFFF,
						&sa,
						PAGE_READWRITE,
						0,
						sizeof(Config),
						NULL);
		    if (filemap) {
			p = (Config *)MapViewOfFile(filemap,
						    FILE_MAP_WRITE,
						    0, 0, sizeof(Config));
			if (p) {
			    *p = cfg;  /* structure copy */
			    UnmapViewOfFile(p);
			}
		    }
		    sprintf(c, "putty &%p", filemap);
		    cl = c;
		} else if (wParam == IDM_SAVEDSESS) {
		    char *session = sessions[(lParam - IDM_SAVED_MIN) / 16];
		    cl = malloc(16 + strlen(session)); /* 8, but play safe */
		    if (!cl)
			cl = NULL;     /* not a very important failure mode */
		    else {
			sprintf(cl, "putty @%s", session);
			freecl = TRUE;
		    }
		} else
		    cl = NULL;

		GetModuleFileName (NULL, b, sizeof(b)-1);
		si.cb = sizeof(si);
		si.lpReserved = NULL;
		si.lpDesktop = NULL;
		si.lpTitle = NULL;
		si.dwFlags = 0;
		si.cbReserved2 = 0;
		si.lpReserved2 = NULL;
		CreateProcess (b, cl, NULL, NULL, TRUE,
			       NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi);

		if (filemap)
		    CloseHandle(filemap);
		if (freecl)
		    free(cl);
	    }
	    break;
	  case IDM_RECONF:
	    if (!do_reconfig(hwnd))
		break;
	    just_reconfigged = TRUE;
	    {
		int i;
		for (i=0; i<8; i++)
		    if (fonts[i])
			DeleteObject(fonts[i]);
	    }
	    bold_mode = cfg.bold_colour ? BOLD_COLOURS : BOLD_FONT;
	    und_mode = UND_FONT;
	    init_fonts(0);
	    sfree(logpal);
	    /* Telnet will change local echo -> remote if the remote asks */
	    if (cfg.protocol != PROT_TELNET)
	        ldisc = (cfg.ldisc_term ? &ldisc_term : &ldisc_simple);
	    if (pal)
		DeleteObject(pal);
	    logpal = NULL;
	    pal = NULL;
	    cfgtopalette();
	    init_palette();

	    /* Enable or disable the scroll bar, etc */
	    {
		LONG nflg, flag = GetWindowLong(hwnd, GWL_STYLE);

		nflg = flag;
		if (cfg.scrollbar) nflg |=  WS_VSCROLL;
		else               nflg &= ~WS_VSCROLL;
		if (cfg.locksize) 
		   nflg &= ~(WS_THICKFRAME|WS_MAXIMIZEBOX);
		else              
		   nflg |= (WS_THICKFRAME|WS_MAXIMIZEBOX);

		if (nflg != flag)
		{
		    RECT cr, wr;

		    SetWindowLong(hwnd, GWL_STYLE, nflg);
		    SendMessage (hwnd, WM_IGNORE_SIZE, 0, 0);
	            SetWindowPos(hwnd, NULL, 0,0,0,0,
		         SWP_NOACTIVATE|SWP_NOCOPYBITS|
			 SWP_NOMOVE|SWP_NOSIZE| SWP_NOZORDER|
			 SWP_FRAMECHANGED);

		    GetWindowRect (hwnd, &wr);
		    GetClientRect (hwnd, &cr);
		    extra_width = wr.right - wr.left - cr.right + cr.left;
		    extra_height = wr.bottom - wr.top - cr.bottom + cr.top;
		}
	    }

	    term_size(cfg.height, cfg.width, cfg.savelines);
	    InvalidateRect(hwnd, NULL, TRUE);
	    SetWindowPos (hwnd, NULL, 0, 0,
			  extra_width + font_width * cfg.width,
			  extra_height + font_height * cfg.height,
			  SWP_NOACTIVATE | SWP_NOCOPYBITS |
			  SWP_NOMOVE | SWP_NOZORDER);
	    if (IsIconic(hwnd)) {
		SetWindowText (hwnd,
			       cfg.win_name_always ? window_name : icon_name);
	    }
	    break;
	  case IDM_CLRSB:
	    term_clrsb();
	    break;
	  case IDM_RESET:
	    term_pwron();
	    break;
	  case IDM_TEL_AYT: back->special (TS_AYT); break;
	  case IDM_TEL_BRK: back->special (TS_BRK); break;
	  case IDM_TEL_SYNCH: back->special (TS_SYNCH); break;
	  case IDM_TEL_EC: back->special (TS_EC); break;
	  case IDM_TEL_EL: back->special (TS_EL); break;
	  case IDM_TEL_GA: back->special (TS_GA); break;
	  case IDM_TEL_NOP: back->special (TS_NOP); break;
	  case IDM_TEL_ABORT: back->special (TS_ABORT); break;
	  case IDM_TEL_AO: back->special (TS_AO); break;
	  case IDM_TEL_IP: back->special (TS_IP); break;
	  case IDM_TEL_SUSP: back->special (TS_SUSP); break;
	  case IDM_TEL_EOR: back->special (TS_EOR); break;
	  case IDM_TEL_EOF: back->special (TS_EOF); break;
	  case IDM_ABOUT:
	    showabout (hwnd);
	    break;
	default:
	  if (wParam >= IDM_SAVED_MIN && wParam <= IDM_SAVED_MAX) {
	    SendMessage(hwnd, WM_SYSCOMMAND, IDM_SAVEDSESS, wParam);
	  }
	}
	break;

#define X_POS(l) ((int)(short)LOWORD(l))
#define Y_POS(l) ((int)(short)HIWORD(l))

#define TO_CHR_X(x) (((x)<0 ? (x)-font_width+1 : (x)) / font_width)
#define TO_CHR_Y(y) (((y)<0 ? (y)-font_height+1: (y)) / font_height)

      case WM_LBUTTONDOWN:
	click (MB_SELECT, TO_CHR_X(X_POS(lParam)),
	       TO_CHR_Y(Y_POS(lParam)));
        SetCapture(hwnd);
	return 0;
      case WM_LBUTTONUP:
	term_mouse (MB_SELECT, MA_RELEASE, TO_CHR_X(X_POS(lParam)),
		    TO_CHR_Y(Y_POS(lParam)));
        ReleaseCapture();
	return 0;
      case WM_MBUTTONDOWN:
        SetCapture(hwnd);
	click (cfg.mouse_is_xterm ? MB_PASTE : MB_EXTEND,
	       TO_CHR_X(X_POS(lParam)),
	       TO_CHR_Y(Y_POS(lParam)));
	return 0;
      case WM_MBUTTONUP:
	term_mouse (cfg.mouse_is_xterm ? MB_PASTE : MB_EXTEND,
		    MA_RELEASE, TO_CHR_X(X_POS(lParam)),
		    TO_CHR_Y(Y_POS(lParam)));
        ReleaseCapture();
	return 0;
      case WM_RBUTTONDOWN:
        SetCapture(hwnd);
	click (cfg.mouse_is_xterm ? MB_EXTEND : MB_PASTE,
	       TO_CHR_X(X_POS(lParam)),
	       TO_CHR_Y(Y_POS(lParam)));
	return 0;
      case WM_RBUTTONUP:
	term_mouse (cfg.mouse_is_xterm ? MB_EXTEND : MB_PASTE,
		    MA_RELEASE, TO_CHR_X(X_POS(lParam)),
		    TO_CHR_Y(Y_POS(lParam)));
        ReleaseCapture();
	return 0;
      case WM_MOUSEMOVE:
	/*
	 * Add the mouse position and message time to the random
	 * number noise, if we're using ssh.
	 */
	if (cfg.protocol == PROT_SSH)
	    noise_ultralight(lParam);

	if (wParam & (MK_LBUTTON | MK_MBUTTON | MK_RBUTTON)) {
	    Mouse_Button b;
	    if (wParam & MK_LBUTTON)
		b = MB_SELECT;
	    else if (wParam & MK_MBUTTON)
		b = cfg.mouse_is_xterm ? MB_PASTE : MB_EXTEND;
	    else
		b = cfg.mouse_is_xterm ? MB_EXTEND : MB_PASTE;
	    term_mouse (b, MA_DRAG, TO_CHR_X(X_POS(lParam)),
			TO_CHR_Y(Y_POS(lParam)));
	}
	return 0;
      case WM_IGNORE_CLIP:
	ignore_clip = wParam;	       /* don't panic on DESTROYCLIPBOARD */
	break;
      case WM_DESTROYCLIPBOARD:
	if (!ignore_clip)
	    term_deselect();
	ignore_clip = FALSE;
	return 0;
      case WM_PAINT:
	{
	    PAINTSTRUCT p;
	    hdc = BeginPaint (hwnd, &p);
	    if (pal) {
		SelectPalette (hdc, pal, TRUE);
		RealizePalette (hdc);
	    }
	    term_paint (hdc, p.rcPaint.left, p.rcPaint.top,
			p.rcPaint.right, p.rcPaint.bottom);
	    SelectObject (hdc, GetStockObject(SYSTEM_FONT));
	    SelectObject (hdc, GetStockObject(WHITE_PEN));
	    EndPaint (hwnd, &p);
	}
	return 0;
      case WM_NETEVENT:
	/* Notice we can get multiple netevents, FD_READ, FD_WRITE etc
	 * but the only one that's likely to try to overload us is FD_READ.
	 * This means buffering just one is fine.
	 */
	if (pending_netevent)
	    enact_pending_netevent();

	pending_netevent = TRUE;
	pend_netevent_wParam=wParam;
	pend_netevent_lParam=lParam;
	return 0;
      case WM_SETFOCUS:
	has_focus = TRUE;
	term_out();
	term_update();
	break;
      case WM_KILLFOCUS:
	has_focus = FALSE;
	term_out();
	term_update();
	break;
      case WM_IGNORE_SIZE:
	ignore_size = TRUE;	       /* don't panic on next WM_SIZE msg */
	break;
      case WM_ENTERSIZEMOVE:
        EnableSizeTip(1);
        resizing = TRUE;
        break;
      case WM_EXITSIZEMOVE:
        EnableSizeTip(0);
        resizing = FALSE;
        back->size();
        break;
      case WM_SIZING:
	{
	    int width, height, w, h, ew, eh;
	    LPRECT r = (LPRECT)lParam;

	    width = r->right - r->left - extra_width;
	    height = r->bottom - r->top - extra_height;
	    w = (width + font_width/2) / font_width; if (w < 1) w = 1;
	    h = (height + font_height/2) / font_height; if (h < 1) h = 1;
            UpdateSizeTip(hwnd, w, h);
	    ew = width - w * font_width;
	    eh = height - h * font_height;
	    if (ew != 0) {
		if (wParam == WMSZ_LEFT ||
		    wParam == WMSZ_BOTTOMLEFT ||
		    wParam == WMSZ_TOPLEFT)
		    r->left += ew;
		else
		    r->right -= ew;
	    }
	    if (eh != 0) {
		if (wParam == WMSZ_TOP ||
		    wParam == WMSZ_TOPRIGHT ||
		    wParam == WMSZ_TOPLEFT)
		    r->top += eh;
		else
		    r->bottom -= eh;
	    }
	    if (ew || eh)
		return 1;
	    else
		return 0;
	}
        /* break;  (never reached) */
      case WM_SIZE:
	if (wParam == SIZE_MINIMIZED) {
	    SetWindowText (hwnd,
			   cfg.win_name_always ? window_name : icon_name);
	    break;
	}
	if (wParam == SIZE_RESTORED || wParam == SIZE_MAXIMIZED)
	    SetWindowText (hwnd, window_name);
	if (!ignore_size) {
	    int width, height, w, h;
#if 0 /* we have fixed this using WM_SIZING now */
            int ew, eh;
#endif

	    width = LOWORD(lParam);
	    height = HIWORD(lParam);
	    w = width / font_width; if (w < 1) w = 1;
	    h = height / font_height; if (h < 1) h = 1;
#if 0 /* we have fixed this using WM_SIZING now */
	    ew = width - w * font_width;
	    eh = height - h * font_height;
	    if (ew != 0 || eh != 0) {
		RECT r;
		GetWindowRect (hwnd, &r);
		SendMessage (hwnd, WM_IGNORE_SIZE, 0, 0);
		SetWindowPos (hwnd, NULL, 0, 0,
			      r.right - r.left - ew, r.bottom - r.top - eh,
			      SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOZORDER);
	    }
#endif
	    if (w != cols || h != rows || just_reconfigged) {
		term_invalidate();
		term_size (h, w, cfg.savelines);
                /*
                 * Don't call back->size in mid-resize. (To prevent
                 * massive numbers of resize events getting sent
                 * down the connection during an NT opaque drag.)
                 */
                if (!resizing)
                    back->size();
		just_reconfigged = FALSE;
	    }
	}
	ignore_size = FALSE;
	return 0;
      case WM_VSCROLL:
	switch (LOWORD(wParam)) {
	  case SB_BOTTOM: term_scroll(-1, 0); break;
	  case SB_TOP: term_scroll(+1, 0); break;
	  case SB_LINEDOWN: term_scroll (0, +1); break;
	  case SB_LINEUP: term_scroll (0, -1); break;
	  case SB_PAGEDOWN: term_scroll (0, +rows/2); break;
	  case SB_PAGEUP: term_scroll (0, -rows/2); break;
	  case SB_THUMBPOSITION: case SB_THUMBTRACK:
	    term_scroll (1, HIWORD(wParam)); break;
	}
	break; 
     case WM_PALETTECHANGED:
	if ((HWND) wParam != hwnd && pal != NULL) {
	    HDC hdc = get_ctx();
	    if (hdc) {
		if (RealizePalette (hdc) > 0)
		    UpdateColors (hdc);
		free_ctx (hdc);
	    }
	}
	break;
      case WM_QUERYNEWPALETTE:
	if (pal != NULL) {
	    HDC hdc = get_ctx();
	    if (hdc) {
		if (RealizePalette (hdc) > 0)
		    UpdateColors (hdc);
		free_ctx (hdc);
		return TRUE;
	    }
	}
	return FALSE;
      case WM_KEYDOWN:
      case WM_SYSKEYDOWN:
      case WM_KEYUP:
      case WM_SYSKEYUP:
	/*
	 * Add the scan code and keypress timing to the random
	 * number noise, if we're using ssh.
	 */
	if (cfg.protocol == PROT_SSH)
	    noise_ultralight(lParam);

	/*
	 * We don't do TranslateMessage since it disassociates the
	 * resulting CHAR message from the KEYDOWN that sparked it,
	 * which we occasionally don't want. Instead, we process
	 * KEYDOWN, and call the Win32 translator functions so that
	 * we get the translations under _our_ control.
	 */
	{
	    unsigned char buf[20];
	    int len;

	    len = TranslateKey (message, wParam, lParam, buf);
	    if (len == -1)
		return DefWindowProc (hwnd, message, wParam, lParam);
	    ldisc->send (buf, len);
	}
	return 0;
      case WM_CHAR:
      case WM_SYSCHAR:
	/*
	 * Nevertheless, we are prepared to deal with WM_CHAR
	 * messages, should they crop up. So if someone wants to
	 * post the things to us as part of a macro manoeuvre,
	 * we're ready to cope.
	 */
	{
	    char c = xlat_kbd2tty((unsigned char)wParam);
	    ldisc->send (&c, 1);
	}
	return 0;
    }

    return DefWindowProc (hwnd, message, wParam, lParam);
}

/*
 * Draw a line of text in the window, at given character
 * coordinates, in given attributes.
 *
 * We are allowed to fiddle with the contents of `text'.
 */
void do_text (Context ctx, int x, int y, char *text, int len,
	      unsigned long attr, int lattr) {
    COLORREF fg, bg, t;
    int nfg, nbg, nfont;
    HDC hdc = ctx;
    RECT line_box;
    int force_manual_underline = 0;
    int fnt_width = font_width*(1+(lattr!=LATTR_NORM));
    static int *IpDx = 0, IpDxLEN = 0;;

    if (len>IpDxLEN || IpDx[0] != fnt_width) {
	int i;
	if (len>IpDxLEN) {
	    sfree(IpDx);
	    IpDx = smalloc((len+16)*sizeof(int));
	    IpDxLEN = (len+16);
	}
	for(i=0; i<IpDxLEN; i++)
	    IpDx[i] = fnt_width;
    }

    x *= fnt_width;
    y *= font_height;

    if (attr & ATTR_ACTCURS) {
	attr &= (bold_mode == BOLD_COLOURS ? 0x300200 : 0x300300);
	attr ^= ATTR_CUR_XOR;
    }

    nfont = 0;
    if (cfg.vtmode == VT_OEMONLY)
	nfont |= FONT_OEM;

    /*
     * Map high-half characters in order to approximate ISO using
     * OEM character set. No characters are missing if the OEM codepage
     * is CP850.
     */
    if (nfont & FONT_OEM) {
	int i;
	for (i=0; i<len; i++)
	    if (text[i] >= '\xA0' && text[i] <= '\xFF') {
#if 0
		/* This is CP850 ... perfect translation */
		static const char oemhighhalf[] =
		    "\x20\xAD\xBD\x9C\xCF\xBE\xDD\xF5" /* A0-A7 */
		    "\xF9\xB8\xA6\xAE\xAA\xF0\xA9\xEE" /* A8-AF */
		    "\xF8\xF1\xFD\xFC\xEF\xE6\xF4\xFA" /* B0-B7 */
		    "\xF7\xFB\xA7\xAF\xAC\xAB\xF3\xA8" /* B8-BF */
		    "\xB7\xB5\xB6\xC7\x8E\x8F\x92\x80" /* C0-C7 */
		    "\xD4\x90\xD2\xD3\xDE\xD6\xD7\xD8" /* C8-CF */
		    "\xD1\xA5\xE3\xE0\xE2\xE5\x99\x9E" /* D0-D7 */
		    "\x9D\xEB\xE9\xEA\x9A\xED\xE8\xE1" /* D8-DF */
		    "\x85\xA0\x83\xC6\x84\x86\x91\x87" /* E0-E7 */
		    "\x8A\x82\x88\x89\x8D\xA1\x8C\x8B" /* E8-EF */
		    "\xD0\xA4\x95\xA2\x93\xE4\x94\xF6" /* F0-F7 */
		    "\x9B\x97\xA3\x96\x81\xEC\xE7\x98" /* F8-FF */
		    ;
#endif
		/* This is CP437 ... junk translation */
		static const unsigned char oemhighhalf[] = {
		    0xff, 0xad, 0x9b, 0x9c, 0x6f, 0x9d, 0x7c, 0x15,
		    0x22, 0x43, 0xa6, 0xae, 0xaa, 0x2d, 0x52, 0xc4,
		    0xf8, 0xf1, 0xfd, 0x33, 0x27, 0xe6, 0x14, 0xfa,
		    0x2c, 0x31, 0xa7, 0xaf, 0xac, 0xab, 0x2f, 0xa8,
		    0x41, 0x41, 0x41, 0x41, 0x8e, 0x8f, 0x92, 0x80,
		    0x45, 0x90, 0x45, 0x45, 0x49, 0x49, 0x49, 0x49,
		    0x44, 0xa5, 0x4f, 0x4f, 0x4f, 0x4f, 0x99, 0x78,
		    0xed, 0x55, 0x55, 0x55, 0x9a, 0x59, 0x50, 0xe1,
		    0x85, 0xa0, 0x83, 0x61, 0x84, 0x86, 0x91, 0x87,
		    0x8a, 0x82, 0x88, 0x89, 0x8d, 0xa1, 0x8c, 0x8b,
		    0x0b, 0xa4, 0x95, 0xa2, 0x93, 0x6f, 0x94, 0xf6,
		    0xed, 0x97, 0xa3, 0x96, 0x81, 0x79, 0x70, 0x98
		};

		text[i] = oemhighhalf[(unsigned char)text[i] - 0xA0];
	    }
    }

    if (attr & ATTR_GBCHR) {
	int i;
	/*
	 * GB mapping: map # to pound, and everything else stays
	 * normal.
	 */
	for (i=0; i<len; i++)
	    if (text[i] == '#')
		text[i] = cfg.vtmode == VT_OEMONLY ? '\x9C' : '\xA3';
    } else if (attr & ATTR_LINEDRW) {
	int i;
	/* ISO 8859-1 */
	static const char poorman[] =
	    "*#****\xB0\xB1**+++++-----++++|****\xA3\xB7";

	/* CP437 */
	static const char oemmap_437[] =
	    "\x04\xB1****\xF8\xF1**\xD9\xBF\xDA\xC0\xC5"
	    "\xC4\xC4\xC4\xC4\xC4\xC3\xB4\xC1\xC2\xB3\xF3\xF2\xE3*\x9C\xFA";

	/* CP850 */
	static const char oemmap_850[] =
	    "\x04\xB1****\xF8\xF1**\xD9\xBF\xDA\xC0\xC5"
	    "\xC4\xC4\xC4\xC4\xC4\xC3\xB4\xC1\xC2\xB3****\x9C\xFA";

	/* Poor windows font ... eg: windows courier */
	static const char oemmap[] =
	    "*\xB1****\xF8\xF1**\xD9\xBF\xDA\xC0\xC5"
	    "\xC4\xC4\xC4\xC4\xC4\xC3\xB4\xC1\xC2\xB3****\x9C\xFA";

	/*
	 * Line drawing mapping: map ` thru ~ (0x60 thru 0x7E) to
	 * VT100 line drawing chars; everything else stays normal.
	 */
	switch (cfg.vtmode) {
	  case VT_XWINDOWS:
	    for (i=0; i<len; i++)
		if (text[i] >= '\x60' && text[i] <= '\x7E')
		    text[i] += '\x01' - '\x60';
	    break;
	  case VT_OEMANSI:
	    /* Make sure we actually have an OEM font */
	    if (fonts[nfont|FONT_OEM]) { 
	  case VT_OEMONLY:
	        nfont |= FONT_OEM;
	        for (i=0; i<len; i++)
		    if (text[i] >= '\x60' && text[i] <= '\x7E')
		        text[i] = oemmap[(unsigned char)text[i] - 0x60];
	        break;
	    }
	  case VT_POORMAN:
	    for (i=0; i<len; i++)
		if (text[i] >= '\x60' && text[i] <= '\x7E')
		    text[i] = poorman[(unsigned char)text[i] - 0x60];
	    break;
	}
    }

    nfg = 2 * ((attr & ATTR_FGMASK) >> ATTR_FGSHIFT);
    nbg = 2 * ((attr & ATTR_BGMASK) >> ATTR_BGSHIFT);
    if (bold_mode == BOLD_FONT && (attr & ATTR_BOLD))
	nfont |= FONT_BOLD;
    if (und_mode == UND_FONT && (attr & ATTR_UNDER))
	nfont |= FONT_UNDERLINE;
    if (!fonts[nfont]) 
    {
	if (nfont&FONT_UNDERLINE)
	    force_manual_underline = 1;
	/* Don't do the same for manual bold, it could be bad news. */

	nfont &= ~(FONT_BOLD|FONT_UNDERLINE);
    }
    if (font_needs_hand_underlining && (attr & ATTR_UNDER))
        force_manual_underline = 1;
    if (attr & ATTR_REVERSE) {
	t = nfg; nfg = nbg; nbg = t;
    }
    if (bold_mode == BOLD_COLOURS && (attr & ATTR_BOLD))
	nfg++;
    if (bold_mode == BOLD_COLOURS && (attr & ATTR_BLINK))
	nbg++;
    fg = colours[nfg];
    bg = colours[nbg];
    SelectObject (hdc, fonts[nfont]);
    SetTextColor (hdc, fg);
    SetBkColor (hdc, bg);
    SetBkMode (hdc, OPAQUE);
    line_box.left   = x;
    line_box.top    = y;
    line_box.right  = x+fnt_width*len;
    line_box.bottom = y+font_height;
    ExtTextOut (hdc, x, y, ETO_CLIPPED|ETO_OPAQUE, &line_box, text, len, IpDx);
    if (bold_mode == BOLD_SHADOW && (attr & ATTR_BOLD)) {
	SetBkMode (hdc, TRANSPARENT);

       /* GRR: This draws the character outside it's box and can leave
	* 'droppings' even with the clip box! I suppose I could loop it
	* one character at a time ... yuk. 
	* 
	* Or ... I could do a test print with "W", and use +1 or -1 for this
	* shift depending on if the leftmost column is blank...
	*/
        ExtTextOut (hdc, x-1, y, ETO_CLIPPED, &line_box, text, len, IpDx);
    }
    if (force_manual_underline || 
	    (und_mode == UND_LINE && (attr & ATTR_UNDER))) {
        HPEN oldpen;
	oldpen = SelectObject (hdc, CreatePen(PS_SOLID, 0, fg));
	MoveToEx (hdc, x, y+descent, NULL);
	LineTo (hdc, x+len*fnt_width, y+descent);
        oldpen = SelectObject (hdc, oldpen);
        DeleteObject (oldpen);
    }
    if (attr & ATTR_PASCURS) {
	POINT pts[5];
        HPEN oldpen;
	pts[0].x = pts[1].x = pts[4].x = x;
	pts[2].x = pts[3].x = x+fnt_width-1;
	pts[0].y = pts[3].y = pts[4].y = y;
	pts[1].y = pts[2].y = y+font_height-1;
	oldpen = SelectObject (hdc, CreatePen(PS_SOLID, 0, colours[23]));
	Polyline (hdc, pts, 5);
        oldpen = SelectObject (hdc, oldpen);
        DeleteObject (oldpen);
    }
}

static int check_compose(int first, int second) {

    static char * composetbl[] = {