win32/editline.c

/*
 * line edition function for Win32 console
 *
 * Copyright 2001 Eric Pouech
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"
#include "wine/port.h"

#include <string.h>

#include "windef.h"
#include "winbase.h"
#include "wincon.h"
#include "wine/unicode.h"
#include "winnls.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(console);

/* console.c */
extern int CONSOLE_GetHistory(int idx, WCHAR* buf, int buf_len);
extern BOOL CONSOLE_AppendHistory(const WCHAR *p);
extern unsigned int CONSOLE_GetNumHistoryEntries(void);

struct WCEL_Context;

typedef struct 
{
    WCHAR			val;		/* vk or unicode char */
    void			(*func)(struct WCEL_Context* ctx);
} KeyEntry;

typedef struct 
{
    DWORD			keyState;	/* keyState (from INPUT_RECORD) to match */
    BOOL			chkChar;	/* check vk or char */
    KeyEntry*			entries;	/* array of entries */
} KeyMap;

typedef struct WCEL_Context {
    WCHAR*			line;		/* the line being edited */
    size_t			alloc;		/* number of WCHAR in line */
    unsigned    		len;		/* number of chars in line */
    unsigned			ofs;		/* offset for cursor in current line */
    WCHAR*			yanked;		/* yanked line */
    unsigned			mark;		/* marked point (emacs mode only) */
    CONSOLE_SCREEN_BUFFER_INFO	csbi;		/* current state (initial cursor, window size, attribute) */
    HANDLE			hConIn;
    HANDLE			hConOut;
    unsigned			done : 1,	/* to 1 when we're done with editing */
	                        error : 1;	/* to 1 when an error occurred in the editing */
    unsigned			histSize;
    unsigned			histPos;
    WCHAR*			histCurr;
} WCEL_Context;

#if 0
static void WCEL_Dump(WCEL_Context* ctx, const char* pfx)
{
    MESSAGE("%s: [line=%s[alloc=%u] ofs=%u len=%u start=(%d,%d) mask=%c%c\n"
	    "\t\thist=(size=%u pos=%u curr=%s)\n", 
	    pfx, debugstr_w(ctx->line), ctx->alloc, ctx->ofs, ctx->len, 
	    ctx->csbi.dwCursorPosition.X, ctx->csbi.dwCursorPosition.Y, 
	    ctx->done ? 'D' : 'd', ctx->error ? 'E' : 'e',
	    ctx->histSize, ctx->histPos, debugstr_w(ctx->histCurr));
}
#endif

/* ====================================================================
 *
 * Console helper functions
 *
 * ====================================================================*/

static BOOL WCEL_Get(WCEL_Context* ctx, INPUT_RECORD* ir)
{
    DWORD		retv;

    for (;;) 
    {
	/* data available ? */
	if (ReadConsoleInputW(ctx->hConIn, ir, 1, &retv) && retv == 1)
	    return TRUE;
	/* then wait... */
	switch (WaitForSingleObject(ctx->hConIn, INFINITE)) 
	{
	case WAIT_OBJECT_0:
	    break;
	default:
	    /* we have checked that hConIn was a console handle (could be sb) */
	    ERR("Shouldn't happen\n");
	    /* fall thru */
	case WAIT_ABANDONED:
	case WAIT_TIMEOUT:
	    ctx->error = 1;
	    ERR("hmm bad situation\n");
	    return FALSE;
	}
    }
}

static inline void WCEL_Beep(WCEL_Context* ctx)
{
    Beep(400, 300);
}

static inline COORD WCEL_GetCoord(WCEL_Context* ctx, int ofs)
{
    COORD c;
    c.X = ctx->csbi.dwCursorPosition.X + ofs;
    c.Y = ctx->csbi.dwCursorPosition.Y;
    return c;
}

static inline void WCEL_GetRect(WCEL_Context* ctx, LPSMALL_RECT sr, int beg, int end)
{
    sr->Left = ctx->csbi.dwCursorPosition.X + beg;
    sr->Top = ctx->csbi.dwCursorPosition.Y;
    sr->Right = ctx->csbi.dwCursorPosition.X + end;
    sr->Bottom = ctx->csbi.dwCursorPosition.Y;
}

/* ====================================================================
 *
 * context manipulation functions
 *
 * ====================================================================*/

static BOOL WCEL_Grow(WCEL_Context* ctx, size_t len)
{
    if (ctx->csbi.dwCursorPosition.X + ctx->ofs + len >= ctx->csbi.dwSize.X)
    {
	FIXME("Current implementation doesn't allow edition to spray across several lines\n");
	return FALSE;
    }

    if (ctx->len + len >= ctx->alloc)
    {
	WCHAR*	newline;
	newline = HeapReAlloc(GetProcessHeap(), 0, ctx->line, sizeof(WCHAR) * (ctx->alloc + 32));
	if (!newline) return FALSE;
	ctx->line = newline;
	ctx->alloc += 32;
    }
    return TRUE;
}

static void WCEL_DeleteString(WCEL_Context* ctx, int beg, int end)
{
    SMALL_RECT	scl, clp;
    CHAR_INFO	ci;

    if (end < ctx->len)
	memmove(&ctx->line[beg], &ctx->line[end], (ctx->len - end) * sizeof(WCHAR));
    /* make the source rect bigger than the actual rect to that the part outside the clip
     * rect (before the scroll) will get redrawn after the scroll
     */
    WCEL_GetRect(ctx, &scl, end, ctx->len + end - beg);
    WCEL_GetRect(ctx, &clp, beg, ctx->len);

    ci.Char.UnicodeChar = ' ';
    ci.Attributes = ctx->csbi.wAttributes;
    ScrollConsoleScreenBufferW(ctx->hConOut, &scl, &clp, WCEL_GetCoord(ctx, beg), &ci);

    ctx->len -= end - beg;
    ctx->line[ctx->len] = 0;
}

static void WCEL_InsertString(WCEL_Context* ctx, const WCHAR* str)
{
    size_t	len = lstrlenW(str);

    if (!len || !WCEL_Grow(ctx, len)) return;
    if (ctx->len > ctx->ofs)
	memmove(&ctx->line[ctx->ofs + len], &ctx->line[ctx->ofs], (ctx->len - ctx->ofs) * sizeof(WCHAR));
    memcpy(&ctx->line[ctx->ofs], str, len * sizeof(WCHAR));
    ctx->len += len;
    ctx->line[ctx->len] = 0;
    SetConsoleCursorPosition(ctx->hConOut, WCEL_GetCoord(ctx, ctx->ofs));
    WriteConsoleW(ctx->hConOut, &ctx->line[ctx->ofs], ctx->len - ctx->ofs, NULL, NULL);
    ctx->ofs += len;
}

static void WCEL_InsertChar(WCEL_Context* ctx, WCHAR c)
{
    WCHAR	buffer[2];

    /* do not insert 0..31 control characters */
    if (c < ' ') 
    {
	if (c != '\t') return;
    }
    buffer[0] = c;
    buffer[1] = 0;
    WCEL_InsertString(ctx, buffer);
}

static void WCEL_SaveYank(WCEL_Context* ctx, int beg, int end)
{
    int len = end - beg;
    ctx->yanked = HeapReAlloc(GetProcessHeap(), 0, ctx->yanked, (len + 1) * sizeof(WCHAR));
    if (!ctx->yanked) return;
    memcpy(ctx->yanked, &ctx->line[beg], len * sizeof(WCHAR));
    ctx->yanked[len] = 0;
}

/* FIXME NTDLL doesn't export iswalnum, and I don't want to link in msvcrt when most
 * of the data lay in unicode lib
 */
static inline BOOL WCEL_iswalnum(WCHAR wc)
{
    return get_char_typeW(wc) & (C1_ALPHA|C1_DIGIT|C1_LOWER|C1_UPPER);
}

static int WCEL_GetLeftWordTransition(WCEL_Context* ctx, int ofs)
{
    ofs--;
    while (ofs >= 0 && !WCEL_iswalnum(ctx->line[ofs])) ofs--;
    while (ofs >= 0 && WCEL_iswalnum(ctx->line[ofs])) ofs--;
    if (ofs >= 0) ofs++;
    return max(ofs, 0);
}

static int WCEL_GetRightWordTransition(WCEL_Context* ctx, int ofs)
{
    ofs++;
    while (ofs <= ctx->len && !WCEL_iswalnum(ctx->line[ofs])) ofs++;
    while (ofs <= ctx->len && WCEL_iswalnum(ctx->line[ofs])) ofs++;
    return min(ofs, ctx->len);
}

static WCHAR* WCEL_GetHistory(WCEL_Context* ctx, int idx)
{
    WCHAR*	ptr;

    if (idx == ctx->histSize - 1) 
    {
	ptr = HeapAlloc(GetProcessHeap(), 0, (lstrlenW(ctx->histCurr) + 1) * sizeof(WCHAR));
	lstrcpyW(ptr, ctx->histCurr);
    }
    else
    {
	int	len = CONSOLE_GetHistory(idx, NULL, 0);
	
	if ((ptr = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR))))
	{
	    CONSOLE_GetHistory(idx, ptr, len);
	}
    }
    return ptr;
}

static void	WCEL_HistoryInit(WCEL_Context* ctx)
{
    ctx->histPos = CONSOLE_GetNumHistoryEntries();
    ctx->histSize = ctx->histPos + 1;
    ctx->histCurr = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(WCHAR));
}

static void    WCEL_MoveToHist(WCEL_Context* ctx, int idx)
{
    WCHAR*	data = WCEL_GetHistory(ctx, idx);
    int		len = lstrlenW(data) + 1;

    /* save current line edition for recall when needed (FIXME seems broken to me) */
    if (ctx->histPos == ctx->histSize - 1)
    {
	if (ctx->histCurr) HeapFree(GetProcessHeap(), 0, ctx->histCurr);
	ctx->histCurr = HeapAlloc(GetProcessHeap(), 0, (ctx->len + 1) * sizeof(WCHAR));
	memcpy(ctx->histCurr, ctx->line, (ctx->len + 1) * sizeof(WCHAR));
    }
    /* need to clean also the screen if new string is shorter than old one */
    WCEL_DeleteString(ctx, 0, ctx->len);
    ctx->ofs = 0;
    /* insert new string */
    if (WCEL_Grow(ctx, len))
    {
	WCEL_InsertString(ctx, data);
	HeapFree(GetProcessHeap(), 0, data);
	ctx->histPos = idx;
    }
}

/* ====================================================================
 *
 * basic edition functions
 *
 * ====================================================================*/

static void WCEL_Done(WCEL_Context* ctx)
{
    if (!WCEL_Grow(ctx, 1)) return;
    ctx->line[ctx->len++] = '\n';
    ctx->line[ctx->len] = 0;
    WriteConsoleA(ctx->hConOut, "\n", 1, NULL, NULL);
    ctx->done = 1;
}

static void WCEL_MoveLeft(WCEL_Context* ctx)
{
    if (ctx->ofs > 0) ctx->ofs--;
}

static void WCEL_MoveRight(WCEL_Context* ctx)
{
    if (ctx->ofs < ctx->len) ctx->ofs++;
}

static void WCEL_MoveToLeftWord(WCEL_Context* ctx)
{
    int	new_ofs = WCEL_GetLeftWordTransition(ctx, ctx->ofs);
    if (new_ofs != ctx->ofs) ctx->ofs = new_ofs;
}

static void WCEL_MoveToRightWord(WCEL_Context* ctx)
{
    int	new_ofs = WCEL_GetRightWordTransition(ctx, ctx->ofs);
    if (new_ofs != ctx->ofs) ctx->ofs = new_ofs;
}

static void WCEL_MoveToBeg(WCEL_Context* ctx)
{
    ctx->ofs = 0;
}

static void WCEL_MoveToEnd(WCEL_Context* ctx)
{
    ctx->ofs = ctx->len;
}

static void WCEL_SetMark(WCEL_Context* ctx)
{
    ctx->mark = ctx->ofs;
}

static void WCEL_ExchangeMark(WCEL_Context* ctx)
{   
    unsigned tmp;

    if (ctx->mark > ctx->len) return;
    tmp = ctx->ofs;
    ctx->ofs = ctx->mark;
    ctx->mark = tmp;
}

static void WCEL_CopyMarkedZone(WCEL_Context* ctx)
{
    unsigned beg, end;

    if (ctx->mark > ctx->len || ctx->mark == ctx->ofs) return;
    if (ctx->mark > ctx->ofs)
    {
	beg = ctx->ofs;		end = ctx->mark;
    }
    else
    {
	beg = ctx->mark;	end = ctx->ofs;
    }
    WCEL_SaveYank(ctx, beg, end);
}

static void WCEL_TransposeChar(WCEL_Context* ctx)
{
    WCHAR	c;

    if (!ctx->ofs || ctx->ofs == ctx->len) return;

    c = ctx->line[ctx->ofs];
    ctx->line[ctx->ofs] = ctx->line[ctx->ofs - 1];
    ctx->line[ctx->ofs - 1] = c;

    WriteConsoleOutputCharacterW(ctx->hConOut, &ctx->line[ctx->ofs - 1], 2, WCEL_GetCoord(ctx, ctx->ofs - 1), NULL);
    ctx->ofs++;
}

static void WCEL_TransposeWords(WCEL_Context* ctx)
{
    FIXME("NIY\n");
}

static void WCEL_LowerCaseWord(WCEL_Context* ctx)
{
    int	new_ofs = WCEL_GetRightWordTransition(ctx, ctx->ofs);
    if (new_ofs != ctx->ofs)
    {
	int	i;
	for (i = ctx->ofs; i <= new_ofs; i++)
	    ctx->line[i] = tolowerW(ctx->line[i]);
	WriteConsoleOutputCharacterW(ctx->hConOut, &ctx->line[ctx->ofs], new_ofs - ctx->ofs + 1, 
				     WCEL_GetCoord(ctx, ctx->ofs), NULL);
	ctx->ofs = new_ofs;
    }
}

static void WCEL_UpperCaseWord(WCEL_Context* ctx)
{
    int	new_ofs = WCEL_GetRightWordTransition(ctx, ctx->ofs);
    if (new_ofs != ctx->ofs)
    {
	int	i;
	for (i = ctx->ofs; i <= new_ofs; i++)
	    ctx->line[i] = toupperW(ctx->line[i]);
	WriteConsoleOutputCharacterW(ctx->hConOut, &ctx->line[ctx->ofs], new_ofs - ctx->ofs + 1, 
				     WCEL_GetCoord(ctx, ctx->ofs), NULL);
	ctx->ofs = new_ofs;
    }
}

static void WCEL_CapitalizeWord(WCEL_Context* ctx)
{
    int	new_ofs = WCEL_GetRightWordTransition(ctx, ctx->ofs);
    if (new_ofs != ctx->ofs)
    {
	int	i;
	
	ctx->line[ctx->ofs] = toupperW(ctx->line[ctx->ofs]);
	for (i = ctx->ofs + 1; i <= new_ofs; i++)
	    ctx->line[i] = tolowerW(ctx->line[i]);
	WriteConsoleOutputCharacterW(ctx->hConOut, &ctx->line[ctx->ofs], new_ofs - ctx->ofs + 1, 
				     WCEL_GetCoord(ctx, ctx->ofs), NULL);
	ctx->ofs = new_ofs;
    }
}

static void WCEL_Yank(WCEL_Context* ctx)
{
    WCEL_InsertString(ctx, ctx->yanked);
    HeapFree(GetProcessHeap(), 0, ctx->yanked);
    ctx->yanked = NULL;
}

static void WCEL_KillToEndOfLine(WCEL_Context* ctx)
{
    WCEL_SaveYank(ctx, ctx->ofs, ctx->len);
    WCEL_DeleteString(ctx, ctx->ofs, ctx->len);
}

static void WCEL_KillMarkedZone(WCEL_Context* ctx)
{
    unsigned beg, end;

    if (ctx->mark > ctx->len || ctx->mark == ctx->ofs) return;
    if (ctx->mark > ctx->ofs)
    {
	beg = ctx->ofs;		end = ctx->mark;
    }
    else
    {
	beg = ctx->mark;	end = ctx->ofs;
    }
    WCEL_SaveYank(ctx, beg, end);
    WCEL_DeleteString(ctx, beg, end);
    ctx->ofs = beg;
}

static void WCEL_DeletePrevChar(WCEL_Context* ctx)
{
    if (ctx->ofs)
    {
	WCEL_DeleteString(ctx, ctx->ofs - 1, ctx->ofs);
	ctx->ofs--;
    }
}

static void WCEL_DeleteCurrChar(WCEL_Context* ctx)
{
    if (ctx->ofs < ctx->len)
	WCEL_DeleteString(ctx, ctx->ofs, ctx->ofs + 1);
}

static void WCEL_DeleteLeftWord(WCEL_Context* ctx)
{
    int	new_ofs = WCEL_GetLeftWordTransition(ctx, ctx->ofs);
    if (new_ofs != ctx->ofs)
    {
	WCEL_DeleteString(ctx, new_ofs, ctx->ofs);
	ctx->ofs = new_ofs;
    }
}

static void WCEL_DeleteRightWord(WCEL_Context* ctx)
{
    int	new_ofs = WCEL_GetRightWordTransition(ctx, ctx->ofs);
    if (new_ofs != ctx->ofs)
    {
	WCEL_DeleteString(ctx, ctx->ofs, new_ofs);
    }
}

static void WCEL_MoveToPrevHist(WCEL_Context* ctx)
{
    if (ctx->histPos) WCEL_MoveToHist(ctx, ctx->histPos - 1);
}

static void WCEL_MoveToNextHist(WCEL_Context* ctx)
{
    if (ctx->histPos < ctx->histSize - 1) WCEL_MoveToHist(ctx, ctx->histPos + 1);
}

static void WCEL_MoveToFirstHist(WCEL_Context* ctx)
{
    if (ctx->histPos != 0) WCEL_MoveToHist(ctx, 0);
}

static void WCEL_MoveToLastHist(WCEL_Context* ctx)
{
    if (ctx->histPos != ctx->histSize - 1) WCEL_MoveToHist(ctx, ctx->histSize - 1);
}

/* ====================================================================
 *
 * 		Key Maps
 *
 * ====================================================================*/

#define CTRL(x)	((x) - '@')
static KeyEntry StdKeyMap[] = 
{
    {/*BACK*/0x08,	WCEL_DeletePrevChar 	},
    {/*RETURN*/0x0d,	WCEL_Done		},
    {/*DEL*/127,	WCEL_DeleteCurrChar 	},
    {	0,		NULL			}
};

static	KeyEntry EmacsKeyMapCtrl[] = 
{
    {	CTRL('@'),	WCEL_SetMark		},
    {	CTRL('A'),	WCEL_MoveToBeg		},
    {	CTRL('B'),	WCEL_MoveLeft		},
    /* C */
    {	CTRL('D'),	WCEL_DeleteCurrChar	},
    {	CTRL('E'),	WCEL_MoveToEnd		},
    {	CTRL('F'),	WCEL_MoveRight		},
    {	CTRL('G'),	WCEL_Beep		},
    {	CTRL('H'),	WCEL_DeletePrevChar	},
    /* I: meaningless (or tab ???) */
    {	CTRL('J'),	WCEL_Done		},
    {	CTRL('K'),	WCEL_KillToEndOfLine	},
    /* L: [NIY] redraw the whole stuff */
    {	CTRL('M'),	WCEL_Done		},
    {	CTRL('N'),	WCEL_MoveToNextHist	},
    /* O; insert line... meaningless */
    {	CTRL('P'),	WCEL_MoveToPrevHist	},
    /* Q: [NIY] quoting... */
    /* R: [NIY] search backwards... */
    /* S: [NIY] search forwards... */
    {	CTRL('T'),	WCEL_TransposeChar	},
    /* U: [NIY] set repeat count... */
    /* V: paragraph down... meaningless */
    {	CTRL('W'),	WCEL_KillMarkedZone	},
    {	CTRL('X'),	WCEL_ExchangeMark	},
    {	CTRL('Y'),	WCEL_Yank		},
    /* Z: meaningless */
    {	0,		NULL			}
};

static KeyEntry EmacsKeyMapAlt[] = 
{
    {/*DEL*/127,	WCEL_DeleteLeftWord	},
    {	'<',		WCEL_MoveToFirstHist	},
    {	'>',		WCEL_MoveToLastHist	},
    {	'?',		WCEL_Beep		},
    {	'b',		WCEL_MoveToLeftWord	},
    {   'c',		WCEL_CapitalizeWord	},
    {	'd',		WCEL_DeleteRightWord	},
    {	'f',		WCEL_MoveToRightWord	},
    {	'l',		WCEL_LowerCaseWord	},
    {   't',		WCEL_TransposeWords	},
    {	'u',		WCEL_UpperCaseWord	},
    {	'w', 		WCEL_CopyMarkedZone	},
    {	0,		NULL			}
};

static KeyEntry EmacsKeyMapExtended[] = 
{
    {/*RETURN*/  0x0d,	WCEL_Done },
    {/*VK_PRIOR*/0x21, 	WCEL_MoveToPrevHist	},
    {/*VK_NEXT*/0x22,	WCEL_MoveToNextHist 	},
    {/*VK_END*/  0x23,	WCEL_MoveToEnd		},
    {/*VK_HOME*/ 0x24,	WCEL_MoveToBeg		},
    {/*VK_RIGHT*/0x27,	WCEL_MoveRight 		},
    {/*VK_LEFT*/0x25,	WCEL_MoveLeft 		},
    {	0,		NULL 			}
};

static KeyMap	EmacsKeyMap[] = 
{
    {0x00000000, 1, StdKeyMap},
    {0x00000001, 1, EmacsKeyMapAlt},	/* left  alt  */
    {0x00000002, 1, EmacsKeyMapAlt},	/* right alt  */
    {0x00000004, 1, EmacsKeyMapCtrl},	/* left  ctrl */
    {0x00000008, 1, EmacsKeyMapCtrl},	/* right ctrl */
    {0x00000100, 0, EmacsKeyMapExtended},
    {0,		 0, 0}
};

static	KeyEntry Win32KeyMapExtended[] = 
{
    {/*VK_LEFT*/ 0x25, 	WCEL_MoveLeft 		},
    {/*VK_RIGHT*/0x27,	WCEL_MoveRight		},
    {/*VK_HOME*/ 0x24,	WCEL_MoveToBeg 		},
    {/*VK_END*/  0x23,	WCEL_MoveToEnd 		},
    {/*VK_UP*/   0x26, 	WCEL_MoveToPrevHist 	},
    {/*VK_DOWN*/ 0x28,	WCEL_MoveToNextHist	},
    {	0,		NULL 			}
};

static	KeyEntry Win32KeyMapCtrlExtended[] = 
{
    {/*VK_LEFT*/ 0x25, 	WCEL_MoveToLeftWord 	},
    {/*VK_RIGHT*/0x27,	WCEL_MoveToRightWord	},
    {	0,		NULL 			}
};

KeyMap	Win32KeyMap[] = 
{
    {0x00000000, 1, StdKeyMap},
    {0x00000100, 0, Win32KeyMapExtended},
    {0x00000104, 0, Win32KeyMapCtrlExtended},
    {0x00000108, 0, Win32KeyMapCtrlExtended},
    {0,		 0, 0}
};
#undef CTRL

/* ====================================================================
 *
 * 		Read line master function
 *
 * ====================================================================*/

WCHAR* CONSOLE_Readline(HANDLE hConsoleIn, int use_emacs)
{
    WCEL_Context	ctx;
    INPUT_RECORD	ir;
    KeyMap*		km;
    KeyEntry*		ke;
    unsigned		ofs;
    void		(*func)(struct WCEL_Context* ctx);
    DWORD               ks;

    memset(&ctx, 0, sizeof(ctx));
    ctx.hConIn = hConsoleIn;
    WCEL_HistoryInit(&ctx);
    if ((ctx.hConOut = CreateFileA("CONOUT$", GENERIC_READ|GENERIC_WRITE, 0, NULL, 
				    OPEN_EXISTING, 0, 0 )) == INVALID_HANDLE_VALUE ||
	!GetConsoleScreenBufferInfo(ctx.hConOut, &ctx.csbi))
	return NULL;
    if (!WCEL_Grow(&ctx, 1))
    {
	CloseHandle(ctx.hConOut);
	return NULL;
    }
    ctx.line[0] = 0;

/* EPP     WCEL_Dump(&ctx, "init"); */

    while (!ctx.done && !ctx.error && WCEL_Get(&ctx, &ir))
    {	
	if (ir.EventType != KEY_EVENT || !ir.Event.KeyEvent.bKeyDown) continue;
	TRACE("key%s repeatCount=%u, keyCode=%02x scanCode=%02x char=%02x keyState=%08lx\n",
	      ir.Event.KeyEvent.bKeyDown ? "Down" : "Up  ", ir.Event.KeyEvent.wRepeatCount,
	      ir.Event.KeyEvent.wVirtualKeyCode, ir.Event.KeyEvent.wVirtualScanCode,
	      ir.Event.KeyEvent.uChar.UnicodeChar, ir.Event.KeyEvent.dwControlKeyState);

/* EPP 	WCEL_Dump(&ctx, "before func"); */
	ofs = ctx.ofs;
        /* mask out some bits which don't interest us */
        ks = ir.Event.KeyEvent.dwControlKeyState & ~(NUMLOCK_ON|SCROLLLOCK_ON|CAPSLOCK_ON);

	func = NULL;
	for (km = (use_emacs) ? EmacsKeyMap : Win32KeyMap; km->entries != NULL; km++)
	{	
	    if (km->keyState != ks)
		continue;
	    if (km->chkChar)
	    {
		for (ke = &km->entries[0]; ke->func != 0; ke++)
		    if (ke->val == ir.Event.KeyEvent.uChar.UnicodeChar) break;
	    }
	    else
	    {
		for (ke = &km->entries[0]; ke->func != 0; ke++)
		    if (ke->val == ir.Event.KeyEvent.wVirtualKeyCode) break;

	    }
	    if (ke->func)
	    {
		func = ke->func;
		break;
	    }
	}

	if (func)
	    (func)(&ctx);
	else if (!(ir.Event.KeyEvent.dwControlKeyState & (ENHANCED_KEY|LEFT_ALT_PRESSED)))
	    WCEL_InsertChar(&ctx, ir.Event.KeyEvent.uChar.UnicodeChar);
	else TRACE("Dropped event\n");

/* EPP 	WCEL_Dump(&ctx, "after func"); */
	if (ctx.ofs != ofs)
	    SetConsoleCursorPosition(ctx.hConOut, WCEL_GetCoord(&ctx, ctx.ofs));
    }
    if (ctx.error) 
    {
	HeapFree(GetProcessHeap(), 0, ctx.line);
	ctx.line = NULL;
    }
    if (ctx.line)
	CONSOLE_AppendHistory(ctx.line);

    CloseHandle(ctx.hConOut);
    if (ctx.histCurr) HeapFree(GetProcessHeap(), 0, ctx.histCurr);
    return ctx.line;
}