shared_source/c_tk_base_7_5_w_mods/tkentry.c

/* $Header$ */

/* 
 * tkEntry.c --
 *
 *      This module implements entry widgets for the Tk
 *      toolkit.  An entry displays a string and allows
 *      the string to be edited.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkentry.c,v 1.1.1.1 2001/06/13 04:59:57 dtashley Exp $
 */

#include "tkInt.h"
#include "default.h"

/*
 * A data structure of the following type is kept for each entry
 * widget managed by this file:
 */

typedef struct {
    Tk_Window tkwin;            /* Window that embodies the entry. NULL
                                 * means that the window has been destroyed
                                 * but the data structures haven't yet been
                                 * cleaned up.*/
    Display *display;           /* Display containing widget.  Used, among
                                 * other things, so that resources can be
                                 * freed even after tkwin has gone away. */
    Tcl_Interp *interp;         /* Interpreter associated with entry. */
    Tcl_Command widgetCmd;      /* Token for entry's widget command. */
    Tk_OptionTable optionTable; /* Table that defines configuration options
                                 * available for this widget. */


    /*
     * Fields that are set by widget commands other than "configure".
     */
     
    char *string;               /* Pointer to storage for string;
                                 * NULL-terminated;  malloc-ed. */
    int insertPos;              /* Character index before which next typed
                                 * character will be inserted. */

    /*
     * Information about what's selected, if any.
     */

    int selectFirst;            /* Character index of first selected
                                 * character (-1 means nothing selected. */
    int selectLast;             /* Character index just after last selected
                                 * character (-1 means nothing selected. */
    int selectAnchor;           /* Fixed end of selection (i.e. "select to"
                                 * operation will use this as one end of the
                                 * selection). */

    /*
     * Information for scanning:
     */

    int scanMarkX;              /* X-position at which scan started (e.g.
                                 * button was pressed here). */
    int scanMarkIndex;          /* Character index of character that was at
                                 * left of window when scan started. */

    /*
     * Configuration settings that are updated by Tk_ConfigureWidget.
     */

    Tk_3DBorder normalBorder;   /* Used for drawing border around whole
                                 * window, plus used for background. */
    int borderWidth;            /* Width of 3-D border around window. */
    Tk_Cursor cursor;           /* Current cursor for window, or None. */
    int exportSelection;        /* Non-zero means tie internal entry selection
                                 * to X selection. */
    Tk_Font tkfont;             /* Information about text font, or NULL. */
    XColor *fgColorPtr;         /* Text color in normal mode. */
    XColor *highlightBgColorPtr;/* Color for drawing traversal highlight
                                 * area when highlight is off. */
    XColor *highlightColorPtr;  /* Color for drawing traversal highlight. */
    int highlightWidth;         /* Width in pixels of highlight to draw
                                 * around widget when it has the focus.
                                 * <= 0 means don't draw a highlight. */
    Tk_3DBorder insertBorder;   /* Used to draw vertical bar for insertion
                                 * cursor. */
    int insertBorderWidth;      /* Width of 3-D border around insert cursor. */
    int insertOffTime;          /* Number of milliseconds cursor should spend
                                 * in "off" state for each blink. */
    int insertOnTime;           /* Number of milliseconds cursor should spend
                                 * in "on" state for each blink. */
    int insertWidth;            /* Total width of insert cursor. */
    Tk_Justify justify;         /* Justification to use for text within
                                 * window. */
    int relief;                 /* 3-D effect: TK_RELIEF_RAISED, etc. */
    Tk_3DBorder selBorder;      /* Border and background for selected
                                 * characters. */
    int selBorderWidth;         /* Width of border around selection. */
    XColor *selFgColorPtr;      /* Foreground color for selected text. */
    char *showChar;             /* Value of -show option.  If non-NULL, first
                                 * character is used for displaying all
                                 * characters in entry.  Malloc'ed. */
    int state;                  /* Normal or disabled.  Entry is read-only
                                 * when disabled. */
    char *textVarName;          /* Name of variable (malloc'ed) or NULL.
                                 * If non-NULL, entry's string tracks the
                                 * contents of this variable and vice versa. */
    char *takeFocus;            /* Value of -takefocus option;  not used in
                                 * the C code, but used by keyboard traversal
                                 * scripts.  Malloc'ed, but may be NULL. */
    int prefWidth;              /* Desired width of window, measured in
                                 * average characters. */
    char *scrollCmd;            /* Command prefix for communicating with
                                 * scrollbar(s).  Malloc'ed.  NULL means
                                 * no command to issue. */

    /*
     * Fields whose values are derived from the current values of the
     * configuration settings above.
     */

    int numBytes;               /* Length of string in bytes. */
    int numChars;               /* Length of string in characters.  Both
                                 * string and displayString have the same
                                 * character length, but may have different
                                 * byte lengths due to being made from
                                 * different UTF-8 characters. */
    char *displayString;        /* String to use when displaying.  This may
                                 * be a pointer to string, or a pointer to
                                 * malloced memory with the same character
                                 * length as string but whose characters
                                 * are all equal to showChar. */
    int numDisplayBytes;        /* Length of displayString in bytes. */
    int inset;                  /* Number of pixels on the left and right
                                 * sides that are taken up by XPAD, borderWidth
                                 * (if any), and highlightWidth (if any). */
    Tk_TextLayout textLayout;   /* Cached text layout information. */
    int layoutX, layoutY;       /* Origin for layout. */
    int leftX;                  /* X position at which character at leftIndex
                                 * is drawn (varies depending on justify). */
    int leftIndex;              /* Character index of left-most character
                                 * visible in window. */
    Tcl_TimerToken insertBlinkHandler;
                                /* Timer handler used to blink cursor on and
                                 * off. */
    GC textGC;                  /* For drawing normal text. */
    GC selTextGC;               /* For drawing selected text. */
    GC highlightGC;             /* For drawing traversal highlight. */
    int avgWidth;               /* Width of average character. */
    int flags;                  /* Miscellaneous flags;  see below for
                                 * definitions. */
    Tk_TSOffset tsoffset;

    char *validateCmd;          /* Command prefix to use when invoking
                                 * validate command.  NULL means don't
                                 * invoke commands.  Malloc'ed. */
    int validate;               /* Non-zero means try to validate */
    char *invalidCmd;           /* Command called when a validation returns 0
                                 * (successfully fails), defaults to {}. */
} Entry;

/*
 * Assigned bits of "flags" fields of Entry structures, and what those
 * bits mean:
 *
 * REDRAW_PENDING:              Non-zero means a DoWhenIdle handler has
 *                              already been queued to redisplay the entry.
 * BORDER_NEEDED:               Non-zero means 3-D border must be redrawn
 *                              around window during redisplay.  Normally
 *                              only text portion needs to be redrawn.
 * CURSOR_ON:                   Non-zero means insert cursor is displayed at
 *                              present.  0 means it isn't displayed.
 * GOT_FOCUS:                   Non-zero means this window has the input
 *                              focus.
 * UPDATE_SCROLLBAR:            Non-zero means scrollbar should be updated
 *                              during next redisplay operation.
 * GOT_SELECTION:               Non-zero means we've claimed the selection.
 * ENTRY_DELETED:               This entry has been effectively destroyed.
 * VALIDATING:                  Non-zero means we are in a validateCmd
 * VALIDATE_VAR:                Non-zero means we are attempting to validate
 *                              the entry's textvariable with validateCmd
 * VALIDATE_ABORT:              Non-zero if validatecommand signals an abort
 *                              for current procedure and make no changes
 */

#define REDRAW_PENDING          1
#define BORDER_NEEDED           2
#define CURSOR_ON               4
#define GOT_FOCUS               8
#define UPDATE_SCROLLBAR        0x10
#define GOT_SELECTION           0x20
#define ENTRY_DELETED           0x40
#define VALIDATING              0x80
#define VALIDATE_VAR            0x100
#define VALIDATE_ABORT          0x200

/*
 * The following macro defines how many extra pixels to leave on each
 * side of the text in the entry.
 */

#define XPAD 1
#define YPAD 1

/*
 * The following enum is used to define a type for the -state option
 * of the Entry widget.  These values are used as indices into the 
 * string table below.
 */

enum state {
    STATE_DISABLED, STATE_NORMAL
};

static char *stateStrings[] = {
    "disabled", "normal", (char *) NULL
};

/*
 * Definitions for -validate option values:
 */

static char *validateStrings[] = {
    "all", "key", "focus", "focusin", "focusout", "none", (char *) NULL
};
enum validateType {
    VALIDATE_ALL, VALIDATE_KEY, VALIDATE_FOCUS,
    VALIDATE_FOCUSIN, VALIDATE_FOCUSOUT, VALIDATE_NONE,
    /*
     * These extra enums are for use with EntryValidateChange
     */
    VALIDATE_FORCED, VALIDATE_DELETE, VALIDATE_INSERT
};
#define DEF_ENTRY_VALIDATE      "none"
#define DEF_ENTRY_INVALIDCMD    ""

/*
 * Information used for argv parsing.
 */

static Tk_OptionSpec optionSpecs[] = {
    {TK_OPTION_BORDER, "-background", "background", "Background",
        DEF_ENTRY_BG_COLOR, -1, Tk_Offset(Entry, normalBorder),
        0, (ClientData) DEF_ENTRY_BG_MONO, 0},
    {TK_OPTION_SYNONYM, "-bd", (char *) NULL, (char *) NULL,
        (char *) NULL, 0, -1, 0, (ClientData) "-borderwidth", 0},
    {TK_OPTION_SYNONYM, "-bg", (char *) NULL, (char *) NULL,
        (char *) NULL, 0, -1, 0, (ClientData) "-background", 0},
    {TK_OPTION_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
        DEF_ENTRY_BORDER_WIDTH, -1, Tk_Offset(Entry, borderWidth), 
        0, 0, 0},
    {TK_OPTION_CURSOR, "-cursor", "cursor", "Cursor",
        DEF_ENTRY_CURSOR, -1, Tk_Offset(Entry, cursor),
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_BOOLEAN, "-exportselection", "exportSelection",
        "ExportSelection", DEF_ENTRY_EXPORT_SELECTION, -1, 
        Tk_Offset(Entry, exportSelection), 0, 0, 0},
    {TK_OPTION_SYNONYM, "-fg", "foreground", (char *) NULL,
        (char *) NULL, 0, -1, 0, (ClientData) "-foreground", 0},
    {TK_OPTION_FONT, "-font", "font", "Font",
        DEF_ENTRY_FONT, -1, Tk_Offset(Entry, tkfont), 0, 0, 0},
    {TK_OPTION_COLOR, "-foreground", "foreground", "Foreground",
        DEF_ENTRY_FG, -1, Tk_Offset(Entry, fgColorPtr), 0, 
        0, 0},
    {TK_OPTION_COLOR, "-highlightbackground", "highlightBackground",
        "HighlightBackground", DEF_ENTRY_HIGHLIGHT_BG,
        -1, Tk_Offset(Entry, highlightBgColorPtr), 
        0, 0, 0},
    {TK_OPTION_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
        DEF_ENTRY_HIGHLIGHT, -1, Tk_Offset(Entry, highlightColorPtr),
        0, 0, 0},
    {TK_OPTION_PIXELS, "-highlightthickness", "highlightThickness",
        "HighlightThickness", DEF_ENTRY_HIGHLIGHT_WIDTH, -1, 
        Tk_Offset(Entry, highlightWidth), 0, 0, 0},
    {TK_OPTION_BORDER, "-insertbackground", "insertBackground", "Foreground",
        DEF_ENTRY_INSERT_BG,
        -1, Tk_Offset(Entry, insertBorder), 
        0, 0, 0},
    {TK_OPTION_PIXELS, "-insertborderwidth", "insertBorderWidth", 
        "BorderWidth", DEF_ENTRY_INSERT_BD_COLOR, -1, 
        Tk_Offset(Entry, insertBorderWidth), 0, 
        (ClientData) DEF_ENTRY_INSERT_BD_MONO, 0},
    {TK_OPTION_INT, "-insertofftime", "insertOffTime", "OffTime",
        DEF_ENTRY_INSERT_OFF_TIME, -1, Tk_Offset(Entry, insertOffTime), 
        0, 0, 0},
    {TK_OPTION_INT, "-insertontime", "insertOnTime", "OnTime",
        DEF_ENTRY_INSERT_ON_TIME, -1, Tk_Offset(Entry, insertOnTime), 
        0, 0, 0},
    {TK_OPTION_PIXELS, "-insertwidth", "insertWidth", "InsertWidth",
        DEF_ENTRY_INSERT_WIDTH, -1, Tk_Offset(Entry, insertWidth), 
        0, 0, 0},
    {TK_OPTION_STRING, "-invalidcommand", "invalidCommand", "InvalidCommand",
        DEF_ENTRY_INVALIDCMD, -1, Tk_Offset(Entry, invalidCmd),
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_SYNONYM, "-invcmd", (char *) NULL, (char *) NULL,
        (char *) NULL, 0, -1, 0, (ClientData) "-invalidcommand", 0},
    {TK_OPTION_JUSTIFY, "-justify", "justify", "Justify",
        DEF_ENTRY_JUSTIFY, -1, Tk_Offset(Entry, justify), 0, 0, 0},
    {TK_OPTION_RELIEF, "-relief", "relief", "Relief",
        DEF_ENTRY_RELIEF, -1, Tk_Offset(Entry, relief), 
        0, 0, 0},
    {TK_OPTION_BORDER, "-selectbackground", "selectBackground", "Foreground",
        DEF_ENTRY_SELECT_COLOR, -1, Tk_Offset(Entry, selBorder),
        0, (ClientData) DEF_ENTRY_SELECT_MONO, 0},
    {TK_OPTION_PIXELS, "-selectborderwidth", "selectBorderWidth", 
        "BorderWidth", DEF_ENTRY_SELECT_BD_COLOR, -1, 
        Tk_Offset(Entry, selBorderWidth), 
        0, (ClientData) DEF_ENTRY_SELECT_BD_MONO, 0},
    {TK_OPTION_COLOR, "-selectforeground", "selectForeground", "Background",
        DEF_ENTRY_SELECT_FG_COLOR, -1, Tk_Offset(Entry, selFgColorPtr),
        0, (ClientData) DEF_ENTRY_SELECT_FG_MONO, 0},
    {TK_OPTION_STRING, "-show", "show", "Show",
        DEF_ENTRY_SHOW, -1, Tk_Offset(Entry, showChar), 
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_STRING_TABLE, "-state", "state", "State",
        DEF_ENTRY_STATE, -1, Tk_Offset(Entry, state), 
        0, (ClientData) stateStrings, 0},
    {TK_OPTION_STRING, "-takefocus", "takeFocus", "TakeFocus",
        DEF_ENTRY_TAKE_FOCUS, -1, Tk_Offset(Entry, takeFocus), 
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_STRING, "-textvariable", "textVariable", "Variable",
        DEF_ENTRY_TEXT_VARIABLE, -1, Tk_Offset(Entry, textVarName),
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_STRING_TABLE, "-validate", "validate", "Validate",
       DEF_ENTRY_VALIDATE, -1, Tk_Offset(Entry, validate),
       0, (ClientData) validateStrings, 0},
    {TK_OPTION_STRING, "-validatecommand", "validateCommand", "ValidateCommand",
       (char *) NULL, -1, Tk_Offset(Entry, validateCmd),
       TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_SYNONYM, "-vcmd", (char *) NULL, (char *) NULL,
        (char *) NULL, 0, -1, 0, (ClientData) "-validatecommand", 0},
    {TK_OPTION_INT, "-width", "width", "Width",
        DEF_ENTRY_WIDTH, -1, Tk_Offset(Entry, prefWidth), 0, 0, 0},
    {TK_OPTION_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
        DEF_ENTRY_SCROLL_COMMAND, -1, Tk_Offset(Entry, scrollCmd),
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_END, (char *) NULL, (char *) NULL, (char *) NULL,
        (char *) NULL, 0, -1, 0, 0, 0}
};

/*
 * Flags for GetEntryIndex procedure:
 */

#define ZERO_OK                 1
#define LAST_PLUS_ONE_OK        2

/*
 * The following tables define the entry widget commands (and sub-
 * commands) and map the indexes into the string tables into 
 * enumerated types used to dispatch the entry widget command.
 */

static char *commandNames[] = {
    "bbox", "cget", "configure", "delete", "get", "icursor", "index", 
    "insert", "scan", "selection", "validate", "xview", (char *) NULL
};

enum command {
    COMMAND_BBOX, COMMAND_CGET, COMMAND_CONFIGURE, COMMAND_DELETE, 
    COMMAND_GET, COMMAND_ICURSOR, COMMAND_INDEX, COMMAND_INSERT, 
    COMMAND_SCAN, COMMAND_SELECTION, COMMAND_VALIDATE, COMMAND_XVIEW
};

static char *selCommandNames[] = {
    "adjust", "clear", "from", "present", "range", "to", (char *) NULL
};

enum selcommand {
    SELECTION_ADJUST, SELECTION_CLEAR, SELECTION_FROM,
    SELECTION_PRESENT, SELECTION_RANGE, SELECTION_TO
};

/*
 * Forward declarations for procedures defined later in this file:
 */

static int              ConfigureEntry _ANSI_ARGS_((Tcl_Interp *interp,
                            Entry *entryPtr, int objc, 
                            Tcl_Obj *CONST objv[], int flags));
static void             DeleteChars _ANSI_ARGS_((Entry *entryPtr, int index,
                            int count));
static void             DestroyEntry _ANSI_ARGS_((char *memPtr));
static void             DisplayEntry _ANSI_ARGS_((ClientData clientData));
static void             EntryBlinkProc _ANSI_ARGS_((ClientData clientData));
static void             EntryCmdDeletedProc _ANSI_ARGS_((
                            ClientData clientData));
static void             EntryComputeGeometry _ANSI_ARGS_((Entry *entryPtr));
static void             EntryEventProc _ANSI_ARGS_((ClientData clientData,
                            XEvent *eventPtr));
static void             EntryFocusProc _ANSI_ARGS_ ((Entry *entryPtr,
                            int gotFocus));
static int              EntryFetchSelection _ANSI_ARGS_((ClientData clientData,
                            int offset, char *buffer, int maxBytes));
static void             EntryLostSelection _ANSI_ARGS_((
                            ClientData clientData));
static void             EventuallyRedraw _ANSI_ARGS_((Entry *entryPtr));
static void             EntryScanTo _ANSI_ARGS_((Entry *entryPtr, int y));
static void             EntrySetValue _ANSI_ARGS_((Entry *entryPtr,
                            char *value));
static void             EntrySelectTo _ANSI_ARGS_((
                            Entry *entryPtr, int index));
static char *           EntryTextVarProc _ANSI_ARGS_((ClientData clientData,
                            Tcl_Interp *interp, char *name1, char *name2,
                            int flags));
static void             EntryUpdateScrollbar _ANSI_ARGS_((Entry *entryPtr));
static int              EntryValidate _ANSI_ARGS_((Entry *entryPtr,
                            char *cmd));
static int              EntryValidateChange _ANSI_ARGS_((Entry *entryPtr,
                            char *change, char *new, int index, int type));
static void             ExpandPercents _ANSI_ARGS_((Entry *entryPtr,
                            char *before, char *change, char *new,
                            int index, int type, Tcl_DString *dsPtr));
static void             EntryValueChanged _ANSI_ARGS_((Entry *entryPtr));
static void             EntryVisibleRange _ANSI_ARGS_((Entry *entryPtr,
                            double *firstPtr, double *lastPtr));
static int              EntryWidgetObjCmd _ANSI_ARGS_((ClientData clientData,
                            Tcl_Interp *interp, int objc, 
                            Tcl_Obj *CONST objv[]));
static void             EntryWorldChanged _ANSI_ARGS_((
                            ClientData instanceData));
static int              GetEntryIndex _ANSI_ARGS_((Tcl_Interp *interp,
                            Entry *entryPtr, char *string, int *indexPtr));
static void             InsertChars _ANSI_ARGS_((Entry *entryPtr, int index,
                            char *string));

/*
 * The structure below defines entry class behavior by means of procedures
 * that can be invoked from generic window code.
 */

static TkClassProcs entryClass = {
    NULL,                       /* createProc. */
    EntryWorldChanged,          /* geometryProc. */
    NULL                        /* modalProc. */
};


/*
 *--------------------------------------------------------------
 *
 * Tk_EntryObjCmd --
 *
 *      This procedure is invoked to process the "entry" Tcl
 *      command.  See the user documentation for details on what
 *      it does.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      See the user documentation.
 *
 *--------------------------------------------------------------
 */

int
Tk_EntryObjCmd(clientData, interp, objc, objv)
    ClientData clientData;      /* Either NULL or pointer to option table. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    register Entry *entryPtr;
    Tk_OptionTable optionTable;
    Tk_Window tkwin;

    optionTable = (Tk_OptionTable) clientData;
    if (optionTable == NULL) {
        Tcl_CmdInfo info;
        char *name;

        /*
         * We haven't created the option table for this widget class
         * yet.  Do it now and save the table as the clientData for
         * the command, so we'll have access to it in future
         * invocations of the command.
         */

        optionTable = Tk_CreateOptionTable(interp, optionSpecs);
        name = Tcl_GetString(objv[0]);
        Tcl_GetCommandInfo(interp, name, &info);
        info.objClientData = (ClientData) optionTable;
        Tcl_SetCommandInfo(interp, name, &info);
    }

    if (objc < 2) {
        Tcl_WrongNumArgs(interp, 1, objv, "pathName ?options?");
        return TCL_ERROR;
    }

    tkwin = Tk_CreateWindowFromPath(interp, Tk_MainWindow(interp),
            Tcl_GetString(objv[1]), (char *) NULL);
    if (tkwin == NULL) {
        return TCL_ERROR;
    }

    /*
     * Initialize the fields of the structure that won't be initialized
     * by ConfigureEntry, or that ConfigureEntry requires to be
     * initialized already (e.g. resource pointers).
     */

    entryPtr                    = (Entry *) ckalloc(sizeof(Entry));
    entryPtr->tkwin             = tkwin;
    entryPtr->display           = Tk_Display(tkwin);
    entryPtr->interp            = interp;
    entryPtr->widgetCmd         = Tcl_CreateObjCommand(interp,
            Tk_PathName(entryPtr->tkwin), EntryWidgetObjCmd,
            (ClientData) entryPtr, EntryCmdDeletedProc);
    entryPtr->optionTable       = optionTable;
    entryPtr->string            = (char *) ckalloc(1);
    entryPtr->string[0]         = '\0';
    entryPtr->insertPos         = 0;
    entryPtr->selectFirst       = -1;
    entryPtr->selectLast        = -1;
    entryPtr->selectAnchor      = 0;
    entryPtr->scanMarkX         = 0;
    entryPtr->scanMarkIndex     = 0;

    entryPtr->normalBorder      = NULL;
    entryPtr->borderWidth       = 0;
    entryPtr->cursor            = None;
    entryPtr->exportSelection   = 1;
    entryPtr->tkfont            = NULL;
    entryPtr->fgColorPtr        = NULL;
    entryPtr->highlightBgColorPtr       = NULL;
    entryPtr->highlightColorPtr = NULL;
    entryPtr->highlightWidth    = 0;
    entryPtr->insertBorder      = NULL;
    entryPtr->insertBorderWidth = 0;
    entryPtr->insertOffTime     = 0;
    entryPtr->insertOnTime      = 0;
    entryPtr->insertWidth       = 0;
    entryPtr->justify           = TK_JUSTIFY_LEFT;
    entryPtr->relief            = TK_RELIEF_FLAT;
    entryPtr->selBorder         = NULL;
    entryPtr->selBorderWidth    = 0;
    entryPtr->selFgColorPtr     = NULL;
    entryPtr->showChar          = NULL;
    entryPtr->state             = STATE_NORMAL;
    entryPtr->textVarName       = NULL;
    entryPtr->takeFocus         = NULL;
    entryPtr->prefWidth         = 0;
    entryPtr->scrollCmd         = NULL;
    entryPtr->numBytes          = 0;
    entryPtr->numChars          = 0;
    entryPtr->displayString     = entryPtr->string;
    entryPtr->numDisplayBytes   = 0;
    entryPtr->inset             = XPAD;
    entryPtr->textLayout        = NULL;
    entryPtr->layoutX           = 0;
    entryPtr->layoutY           = 0;
    entryPtr->leftX             = 0;
    entryPtr->leftIndex         = 0;
    entryPtr->insertBlinkHandler        = (Tcl_TimerToken) NULL;
    entryPtr->textGC            = None;
    entryPtr->selTextGC         = None;
    entryPtr->highlightGC       = None;
    entryPtr->avgWidth          = 1;
    entryPtr->flags             = 0;
    entryPtr->validateCmd       = NULL;
    entryPtr->validate          = VALIDATE_NONE;
    entryPtr->invalidCmd        = NULL;

    Tk_SetClass(entryPtr->tkwin, "Entry");
    TkSetClassProcs(entryPtr->tkwin, &entryClass, (ClientData) entryPtr);
    Tk_CreateEventHandler(entryPtr->tkwin,
            ExposureMask|StructureNotifyMask|FocusChangeMask,
            EntryEventProc, (ClientData) entryPtr);
    Tk_CreateSelHandler(entryPtr->tkwin, XA_PRIMARY, XA_STRING,
            EntryFetchSelection, (ClientData) entryPtr, XA_STRING);

    if ((Tk_InitOptions(interp, (char *) entryPtr, optionTable, tkwin)
            != TCL_OK) ||
            (ConfigureEntry(interp, entryPtr, objc-2, objv+2, 0) != TCL_OK)) {
        Tk_DestroyWindow(entryPtr->tkwin);
        return TCL_ERROR;
    }
    
    Tcl_SetResult(interp, Tk_PathName(entryPtr->tkwin), TCL_STATIC);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * EntryWidgetObjCmd --
 *
 *      This procedure is invoked to process the Tcl command
 *      that corresponds to a widget managed by this module.
 *      See the user documentation for details on what it does.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      See the user documentation.
 *
 *--------------------------------------------------------------
 */

static int
EntryWidgetObjCmd(clientData, interp, objc, objv)
    ClientData clientData;      /* Information about entry widget. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int objc;                   /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    Entry *entryPtr = (Entry *) clientData;
    int cmdIndex, selIndex, result;
    Tcl_Obj *objPtr;

    if (objc < 2) {
        Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
        return TCL_ERROR;
    }
    Tcl_Preserve((ClientData) entryPtr);

    /* 
     * Parse the widget command by looking up the second token in
     * the list of valid command names. 
     */

    result = Tcl_GetIndexFromObj(interp, objv[1], commandNames,
            "option", 0, &cmdIndex);
    if (result != TCL_OK) {
        return result;
    }

    switch (cmdIndex) {
        case COMMAND_BBOX: {
            int index, x, y, width, height;
            char buf[TCL_INTEGER_SPACE * 4];

            if (objc != 3) {
                Tcl_WrongNumArgs(interp, 2, objv, "index");
                goto error;
            }
            if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
                goto error;
            }
            if ((index == entryPtr->numChars) && (index > 0)) {
                index--;
            }
            Tk_CharBbox(entryPtr->textLayout, index, &x, &y, 
                    &width, &height);
            sprintf(buf, "%d %d %d %d", x + entryPtr->layoutX,
                    y + entryPtr->layoutY, width, height);
            Tcl_SetResult(interp, buf, TCL_VOLATILE);
            break;
        } 
        
        case COMMAND_CGET: {
            if (objc != 3) {
                Tcl_WrongNumArgs(interp, 2, objv, "option");
                goto error;
            }
            
            objPtr = Tk_GetOptionValue(interp, (char *) entryPtr,
                    entryPtr->optionTable, objv[2], entryPtr->tkwin);
            if (objPtr == NULL) {
                 goto error;
            } else {
                Tcl_SetObjResult(interp, objPtr);
            }
            break;
        }

        case COMMAND_CONFIGURE: {
            if (objc <= 3) {
                objPtr = Tk_GetOptionInfo(interp, (char *) entryPtr,
                        entryPtr->optionTable,
                        (objc == 3) ? objv[2] : (Tcl_Obj *) NULL,
                        entryPtr->tkwin);
                if (objPtr == NULL) {
                    goto error;
                } else {
                    Tcl_SetObjResult(interp, objPtr);
                }
            } else {
                result = ConfigureEntry(interp, entryPtr, objc-2, objv+2, 0);
            }
            break;
        }

        case COMMAND_DELETE: {
            int first, last;

            if ((objc < 3) || (objc > 4)) {
                Tcl_WrongNumArgs(interp, 2, objv, "firstIndex ?lastIndex?");
                goto error;
            }
            if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &first) != TCL_OK) {
                goto error;
            }
            if (objc == 3) {
                last = first + 1;
            } else {
                if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[3]), 
                        &last) != TCL_OK) {
                    goto error;
                }
            }
            if ((last >= first) && (entryPtr->state == STATE_NORMAL)) {
                DeleteChars(entryPtr, first, last - first);
            }
            break;
        }

        case COMMAND_GET: {
            if (objc != 2) {
                Tcl_WrongNumArgs(interp, 2, objv, (char *) NULL);
                goto error;
            }
            Tcl_SetResult(interp, entryPtr->string, TCL_STATIC);
            break;
        }

        case COMMAND_ICURSOR: {
            if (objc != 3) {
                Tcl_WrongNumArgs(interp, 2, objv, "pos");
                goto error;
            }
            if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]),
                    &entryPtr->insertPos) != TCL_OK) {
                goto error;
            }
            EventuallyRedraw(entryPtr);
            break;
        }
        
        case COMMAND_INDEX: {
            int index;

            if (objc != 3) {
                Tcl_WrongNumArgs(interp, 2, objv, "string");
                goto error;
            }
            if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
                goto error;
            }
            Tcl_SetObjResult(interp, Tcl_NewIntObj(index));
            break;
        }

        case COMMAND_INSERT: {
            int index;

            if (objc != 4) {
                Tcl_WrongNumArgs(interp, 2, objv, "index text");
                goto error;
            }
            if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
                goto error;
            }
            if (entryPtr->state == STATE_NORMAL) {
                InsertChars(entryPtr, index, Tcl_GetString(objv[3]));
            }
            break;
        }

        case COMMAND_SCAN: {
            int x;
            char *minorCmd;

            if (objc != 4) {
                Tcl_WrongNumArgs(interp, 2, objv, "mark|dragto x");
                goto error;
            }
            if (Tcl_GetIntFromObj(interp, objv[3], &x) != TCL_OK) {
                goto error;
            }

            minorCmd = Tcl_GetString(objv[2]);
            if (minorCmd[0] == 'm' 
                    && (strncmp(minorCmd, "mark", strlen(minorCmd)) == 0)) {
                entryPtr->scanMarkX = x;
                entryPtr->scanMarkIndex = entryPtr->leftIndex;
            } else if ((minorCmd[0] == 'd')
                && (strncmp(minorCmd, "dragto", strlen(minorCmd)) == 0)) {
                EntryScanTo(entryPtr, x);
            } else {
                Tcl_AppendResult(interp, "bad scan option \"", 
                        Tcl_GetString(objv[2]), "\": must be mark or dragto", 
                        (char *) NULL);
                goto error;
            }
            break;
        }
            
        case COMMAND_SELECTION: {
            int index, index2;

            if (objc < 3) {
                Tcl_WrongNumArgs(interp, 2, objv, "option ?index?");
                goto error;
            }

            /* 
             * Parse the selection sub-command, using the command
             * table "selCommandNames" defined above.
             */
            
            result = Tcl_GetIndexFromObj(interp, objv[2], selCommandNames,
                    "selection option", 0, &selIndex);
            if (result != TCL_OK) {
                goto error;
            }

            switch(selIndex) {
                case SELECTION_ADJUST: {
                    if (objc != 4) {
                        Tcl_WrongNumArgs(interp, 3, objv, "index");
                        goto error;
                    }
                    if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                        goto error;
                    }
                    if (entryPtr->selectFirst >= 0) {
                        int half1, half2;
                
                        half1 = (entryPtr->selectFirst 
                                + entryPtr->selectLast)/2;
                        half2 = (entryPtr->selectFirst 
                                + entryPtr->selectLast + 1)/2;
                        if (index < half1) {
                            entryPtr->selectAnchor = entryPtr->selectLast;
                        } else if (index > half2) {
                            entryPtr->selectAnchor = entryPtr->selectFirst;
                        } else {
                          /*
                           * We're at about the halfway point in the 
                           * selection; just keep the existing anchor.
                           */
                        }
                    }
                    EntrySelectTo(entryPtr, index);
                    break;
                }

                case SELECTION_CLEAR: {
                    if (objc != 3) {
                        Tcl_WrongNumArgs(interp, 3, objv, (char *) NULL);
                        goto error;
                    }
                    if (entryPtr->selectFirst >= 0) {
                        entryPtr->selectFirst = -1;
                        entryPtr->selectLast = -1;
                        EventuallyRedraw(entryPtr);
                    }
                    goto done;
                }

                case SELECTION_FROM: {
                    if (objc != 4) {
                        Tcl_WrongNumArgs(interp, 3, objv, "index");
                        goto error;
                    }
                    if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                        goto error;
                    }
                    entryPtr->selectAnchor = index;
                    break;
                }

                case SELECTION_PRESENT: {
                    if (objc != 3) {
                        Tcl_WrongNumArgs(interp, 3, objv, (char *) NULL);
                        goto error;
                    }
                    if (entryPtr->selectFirst < 0) {
                        Tcl_SetResult(interp, "0", TCL_STATIC);
                    } else {
                        Tcl_SetResult(interp, "1", TCL_STATIC);
                    }
                    goto done;
                }

                case SELECTION_RANGE: {
                    if (objc != 5) {
                        Tcl_WrongNumArgs(interp, 3, objv, "start end");
                        goto error;
                    }
                    if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                        goto error;
                    }
                    if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[4]),& index2) != TCL_OK) {
                        goto error;
                    }
                    if (index >= index2) {
                        entryPtr->selectFirst = -1;
                        entryPtr->selectLast = -1;
                    } else {
                        entryPtr->selectFirst = index;
                        entryPtr->selectLast = index2;
                    }
                    if (!(entryPtr->flags & GOT_SELECTION)
                            && (entryPtr->exportSelection)) {
                        Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, 
                                EntryLostSelection, (ClientData) entryPtr);
                        entryPtr->flags |= GOT_SELECTION;
                    }
                    EventuallyRedraw(entryPtr);
                    break;
                }
                
                case SELECTION_TO: {
                    if (objc != 4) {
                        Tcl_WrongNumArgs(interp, 3, objv, "index");
                        goto error;
                    }
                    if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                        goto error;
                    }
                    EntrySelectTo(entryPtr, index);
                    break;
                }
            }
            break;
        }

        case COMMAND_VALIDATE: {
            int code;

            if (objc != 2) {
                Tcl_WrongNumArgs(interp, 2, objv, (char *) NULL);
                goto error;
            }
            selIndex = entryPtr->validate;
            entryPtr->validate = VALIDATE_ALL;
            code = EntryValidateChange(entryPtr, (char *) NULL,
                                       entryPtr->string, -1, VALIDATE_FORCED);
            if (entryPtr->validate != VALIDATE_NONE) {
                entryPtr->validate = selIndex;
            }
            Tcl_SetObjResult(interp, Tcl_NewBooleanObj((code == TCL_OK)));
            break;
        }

        case COMMAND_XVIEW: {
            int index;

            if (objc == 2) {
                double first, last;
                char buf[TCL_DOUBLE_SPACE * 2];
            
                EntryVisibleRange(entryPtr, &first, &last);
                sprintf(buf, "%g %g", first, last);
                Tcl_SetResult(interp, buf, TCL_VOLATILE);
                goto done;
            } else if (objc == 3) {
                if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                        &index) != TCL_OK) {
                    goto error;
                }
            } else {
                double fraction;
                int count;

                index = entryPtr->leftIndex;
                switch (Tk_GetScrollInfoObj(interp, objc, objv, &fraction, 
                        &count)) {
                    case TK_SCROLL_ERROR: {
                        goto error;
                    }
                    case TK_SCROLL_MOVETO: {
                        index = (int) ((fraction * entryPtr->numChars) + 0.5);
                        break;
                    }
                    case TK_SCROLL_PAGES: {
                        int charsPerPage;
                    
                        charsPerPage = ((Tk_Width(entryPtr->tkwin)
                                - 2 * entryPtr->inset) 
                                / entryPtr->avgWidth) - 2;
                        if (charsPerPage < 1) {
                            charsPerPage = 1;
                        }
                        index += count * charsPerPage;
                        break;
                    }
                    case TK_SCROLL_UNITS: {
                        index += count;
                        break;
                    }
                }
            }
            if (index >= entryPtr->numChars) {
                index = entryPtr->numChars - 1;
            }
            if (index < 0) {
                index = 0;
            }
            entryPtr->leftIndex = index;
            entryPtr->flags |= UPDATE_SCROLLBAR;
            EntryComputeGeometry(entryPtr);
            EventuallyRedraw(entryPtr);
            break;
        }
    }

    done:
    Tcl_Release((ClientData) entryPtr);
    return result;

    error:
    Tcl_Release((ClientData) entryPtr);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * DestroyEntry --
 *
 *      This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
 *      to clean up the internal structure of an entry at a safe time
 *      (when no-one is using it anymore).
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Everything associated with the entry is freed up.
 *
 *----------------------------------------------------------------------
 */

static void
DestroyEntry(memPtr)
    char *memPtr;               /* Info about entry widget. */
{
    Entry *entryPtr = (Entry *) memPtr;
    entryPtr->flags |= ENTRY_DELETED;

    Tcl_DeleteCommandFromToken(entryPtr->interp, entryPtr->widgetCmd);
    if (entryPtr->flags & REDRAW_PENDING) {
        Tcl_CancelIdleCall(DisplayEntry, (ClientData) entryPtr);
    }

    /*
     * Free up all the stuff that requires special handling, then
     * let Tk_FreeOptions handle all the standard option-related
     * stuff.
     */

    ckfree(entryPtr->string);
    if (entryPtr->textVarName != NULL) {
        Tcl_UntraceVar(entryPtr->interp, entryPtr->textVarName,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                EntryTextVarProc, (ClientData) entryPtr);
    }
    if (entryPtr->textGC != None) {
        Tk_FreeGC(entryPtr->display, entryPtr->textGC);
    }
    if (entryPtr->selTextGC != None) {
        Tk_FreeGC(entryPtr->display, entryPtr->selTextGC);
    }
    Tcl_DeleteTimerHandler(entryPtr->insertBlinkHandler);
    if (entryPtr->displayString != entryPtr->string) {
        ckfree(entryPtr->displayString);
    }
    Tk_FreeTextLayout(entryPtr->textLayout);
    Tk_FreeConfigOptions((char *) entryPtr, entryPtr->optionTable,
            entryPtr->tkwin);
    entryPtr->tkwin = NULL;
    ckfree((char *) entryPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * ConfigureEntry --
 *
 *      This procedure is called to process an argv/argc list, plus
 *      the Tk option database, in order to configure (or reconfigure)
 *      an entry widget.
 *
 * Results:
 *      The return value is a standard Tcl result.  If TCL_ERROR is
 *      returned, then the interp's result contains an error message.
 *
 * Side effects:
 *      Configuration information, such as colors, border width,
 *      etc. get set for entryPtr;  old resources get freed,
 *      if there were any.
 *
 *----------------------------------------------------------------------
 */

static int
ConfigureEntry(interp, entryPtr, objc, objv, flags)
    Tcl_Interp *interp;         /* Used for error reporting. */
    Entry *entryPtr;            /* Information about widget; may or may not
                                 * already have values for some fields. */
    int objc;                   /* Number of valid entries in argv. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
    int flags;                  /* Flags to pass to Tk_ConfigureWidget. */
{
    Tk_SavedOptions savedOptions;
    Tcl_Obj *errorResult = NULL;
    int error;
    int oldExport;

    /*
     * Eliminate any existing trace on a variable monitored by the entry.
     */

    if (entryPtr->textVarName != NULL) {
        Tcl_UntraceVar(interp, entryPtr->textVarName, 
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                EntryTextVarProc, (ClientData) entryPtr);
    }

    oldExport = entryPtr->exportSelection;

    for (error = 0; error <= 1; error++) {
        if (!error) {
            /*
             * First pass: set options to new values.
             */

            if (Tk_SetOptions(interp, (char *) entryPtr,
                    entryPtr->optionTable, objc, objv,
                    entryPtr->tkwin, &savedOptions, (int *) NULL) != TCL_OK) {
                continue;
            }
        } else {
            /*
             * Second pass: restore options to old values.
             */

            errorResult = Tcl_GetObjResult(interp);
            Tcl_IncrRefCount(errorResult);
            Tk_RestoreSavedOptions(&savedOptions);
        }

        /*
         * A few other options also need special processing, such as parsing
         * the geometry and setting the background from a 3-D border.
         */

        Tk_SetBackgroundFromBorder(entryPtr->tkwin, entryPtr->normalBorder);

        if (entryPtr->insertWidth <= 0) {
            entryPtr->insertWidth = 2;
        }
        if (entryPtr->insertBorderWidth > entryPtr->insertWidth/2) {
            entryPtr->insertBorderWidth = entryPtr->insertWidth/2;
        }

        /*
         * Restart the cursor timing sequence in case the on-time or 
         * off-time just changed.  Set validate temporarily to none,
         * so the configure doesn't cause it to be triggered.
         */

        if (entryPtr->flags & GOT_FOCUS) {
            int validate = entryPtr->validate;
            entryPtr->validate = VALIDATE_NONE;
            EntryFocusProc(entryPtr, 1);
            entryPtr->validate = validate;
        }

        /*
         * Claim the selection if we've suddenly started exporting it.
         */

        if (entryPtr->exportSelection && (!oldExport)
                && (entryPtr->selectFirst != -1)
                && !(entryPtr->flags & GOT_SELECTION)) {
            Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection,
                    (ClientData) entryPtr);
            entryPtr->flags |= GOT_SELECTION;
        }

        /*
         * Recompute the window's geometry and arrange for it to be
         * redisplayed.
         */

        Tk_SetInternalBorder(entryPtr->tkwin,
                entryPtr->borderWidth + entryPtr->highlightWidth);
        if (entryPtr->highlightWidth <= 0) {
            entryPtr->highlightWidth = 0;
        }
        entryPtr->inset = entryPtr->highlightWidth 
                + entryPtr->borderWidth + XPAD;
        break;
    }
    if (!error) {
        Tk_FreeSavedOptions(&savedOptions);
    }

    /*
     * If the entry is tied to the value of a variable, then set up
     * a trace on the variable's value, create the variable if it doesn't
     * exist, and set the entry's value from the variable's value.
     */

    if (entryPtr->textVarName != NULL) {
        char *value;

        value = Tcl_GetVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY);
        if (value == NULL) {
            EntryValueChanged(entryPtr);
        } else {
            EntrySetValue(entryPtr, value);
        }
        Tcl_TraceVar(interp, entryPtr->textVarName,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                EntryTextVarProc, (ClientData) entryPtr);
    }

    EntryWorldChanged((ClientData) entryPtr);
    if (error) {
        Tcl_SetObjResult(interp, errorResult);
        Tcl_DecrRefCount(errorResult);
        return TCL_ERROR;
    } else {
        return TCL_OK;
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * EntryWorldChanged --
 *
 *      This procedure is called when the world has changed in some
 *      way and the widget needs to recompute all its graphics contexts
 *      and determine its new geometry.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Entry will be relayed out and redisplayed.
 *
 *---------------------------------------------------------------------------
 */
 
static void
EntryWorldChanged(instanceData)
    ClientData instanceData;    /* Information about widget. */
{
    XGCValues gcValues;
    GC gc = None;
    unsigned long mask;
    Entry *entryPtr;

    entryPtr = (Entry *) instanceData;

    entryPtr->avgWidth = Tk_TextWidth(entryPtr->tkfont, "0", 1);
    if (entryPtr->avgWidth == 0) {
        entryPtr->avgWidth = 1;
    }

    if (entryPtr->normalBorder != NULL) {
        Tk_SetBackgroundFromBorder(entryPtr->tkwin, entryPtr->normalBorder);
    }

    gcValues.foreground = entryPtr->fgColorPtr->pixel;
    gcValues.font = Tk_FontId(entryPtr->tkfont);
    gcValues.graphics_exposures = False;
    mask = GCForeground | GCFont | GCGraphicsExposures;
    gc = Tk_GetGC(entryPtr->tkwin, mask, &gcValues);
    if (entryPtr->textGC != None) {
        Tk_FreeGC(entryPtr->display, entryPtr->textGC);
    }
    entryPtr->textGC = gc;

    gcValues.foreground = entryPtr->selFgColorPtr->pixel;
    gcValues.font = Tk_FontId(entryPtr->tkfont);
    mask = GCForeground | GCFont;
    gc = Tk_GetGC(entryPtr->tkwin, mask, &gcValues);
    if (entryPtr->selTextGC != None) {
        Tk_FreeGC(entryPtr->display, entryPtr->selTextGC);
    }
    entryPtr->selTextGC = gc;

    /*
     * Recompute the window's geometry and arrange for it to be
     * redisplayed.
     */

    EntryComputeGeometry(entryPtr);
    entryPtr->flags |= UPDATE_SCROLLBAR;
    EventuallyRedraw(entryPtr);
}

/*
 *--------------------------------------------------------------
 *
 * DisplayEntry --
 *
 *      This procedure redraws the contents of an entry window.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Information appears on the screen.
 *
 *--------------------------------------------------------------
 */

static void
DisplayEntry(clientData)
    ClientData clientData;      /* Information about window. */
{
    Entry *entryPtr = (Entry *) clientData;
    Tk_Window tkwin = entryPtr->tkwin;
    int baseY, selStartX, selEndX, cursorX;
    int xBound;
    Tk_FontMetrics fm;
    Pixmap pixmap;
    int showSelection;

    entryPtr->flags &= ~REDRAW_PENDING;
    if ((entryPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
        return;
    }

    Tk_GetFontMetrics(entryPtr->tkfont, &fm);

    /*
     * Update the scrollbar if that's needed.
     */

    if (entryPtr->flags & UPDATE_SCROLLBAR) {
        entryPtr->flags &= ~UPDATE_SCROLLBAR;
        EntryUpdateScrollbar(entryPtr);
    }

    /*
     * In order to avoid screen flashes, this procedure redraws the
     * textual area of the entry into off-screen memory, then copies
     * it back on-screen in a single operation.  This means there's
     * no point in time where the on-screen image has been cleared.
     */

    pixmap = Tk_GetPixmap(entryPtr->display, Tk_WindowId(tkwin),
            Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));

    /*
     * Compute x-coordinate of the pixel just after last visible
     * one, plus vertical position of baseline of text.
     */

    xBound = Tk_Width(tkwin) - entryPtr->inset;
    baseY = (Tk_Height(tkwin) + fm.ascent - fm.descent) / 2;

    /*
     * On Windows and Mac, we need to hide the selection whenever we
     * don't have the focus.
     */

#ifdef ALWAYS_SHOW_SELECTION
    showSelection = 1;
#else
    showSelection = (entryPtr->flags & GOT_FOCUS);
#endif

    /*
     * Draw the background in three layers.  From bottom to top the
     * layers are:  normal background, selection background, and
     * insertion cursor background.
     */

    Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->normalBorder,
                0, 0, Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);

    if (showSelection
            && (entryPtr->selectLast > entryPtr->leftIndex)) {
        if (entryPtr->selectFirst <= entryPtr->leftIndex) {
            selStartX = entryPtr->leftX;
        } else {
            Tk_CharBbox(entryPtr->textLayout, entryPtr->selectFirst,
                    &selStartX, NULL, NULL, NULL);
            selStartX += entryPtr->layoutX;
        }
        if ((selStartX - entryPtr->selBorderWidth) < xBound) {
            Tk_CharBbox(entryPtr->textLayout, entryPtr->selectLast,
                    &selEndX, NULL, NULL, NULL);
            selEndX += entryPtr->layoutX;
            Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->selBorder,
                    selStartX - entryPtr->selBorderWidth,
                    baseY - fm.ascent - entryPtr->selBorderWidth,
                    (selEndX - selStartX) + 2*entryPtr->selBorderWidth,
                    (fm.ascent + fm.descent) + 2*entryPtr->selBorderWidth,
                    entryPtr->selBorderWidth, TK_RELIEF_RAISED);
        } 
    }

    /*
     * Draw a special background for the insertion cursor, overriding
     * even the selection background.  As a special hack to keep the
     * cursor visible when the insertion cursor color is the same as
     * the color for selected text (e.g., on mono displays), write
     * background in the cursor area (instead of nothing) when the
     * cursor isn't on.  Otherwise the selection would hide the cursor.
     */

    if ((entryPtr->insertPos >= entryPtr->leftIndex)
            && (entryPtr->state == STATE_NORMAL)
            && (entryPtr->flags & GOT_FOCUS)) {
        Tk_CharBbox(entryPtr->textLayout, entryPtr->insertPos, &cursorX, NULL,
                NULL, NULL);
        cursorX += entryPtr->layoutX;
        cursorX -= (entryPtr->insertWidth)/2;
        if (cursorX < xBound) {
            if (entryPtr->flags & CURSOR_ON) {
                Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->insertBorder,
                        cursorX, baseY - fm.ascent, entryPtr->insertWidth,
                        fm.ascent + fm.descent, entryPtr->insertBorderWidth,
                        TK_RELIEF_RAISED);
            } else if (entryPtr->insertBorder == entryPtr->selBorder) {
                Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->normalBorder,
                        cursorX, baseY - fm.ascent, entryPtr->insertWidth,
                        fm.ascent + fm.descent, 0, TK_RELIEF_FLAT);
            }
        }
    }

    /*
     * Draw the text in two pieces:  first the unselected portion, then the
     * selected portion on top of it.
     */

    Tk_DrawTextLayout(entryPtr->display, pixmap, entryPtr->textGC,
            entryPtr->textLayout, entryPtr->layoutX, entryPtr->layoutY,
            entryPtr->leftIndex, entryPtr->numChars);

    if (showSelection
            && (entryPtr->selTextGC != entryPtr->textGC)
            && (entryPtr->selectFirst < entryPtr->selectLast)) {
        int selFirst;

        if (entryPtr->selectFirst < entryPtr->leftIndex) {
            selFirst = entryPtr->leftIndex;
        } else {
            selFirst = entryPtr->selectFirst;
        }
        Tk_DrawTextLayout(entryPtr->display, pixmap, entryPtr->selTextGC,
                entryPtr->textLayout, entryPtr->layoutX, entryPtr->layoutY,
                selFirst, entryPtr->selectLast);
    }

    /*
     * Draw the border and focus highlight last, so they will overwrite
     * any text that extends past the viewable part of the window.
     */

    if (entryPtr->relief != TK_RELIEF_FLAT) {
        Tk_Draw3DRectangle(tkwin, pixmap, entryPtr->normalBorder,
                entryPtr->highlightWidth, entryPtr->highlightWidth,
                Tk_Width(tkwin) - 2 * entryPtr->highlightWidth,
                Tk_Height(tkwin) - 2 * entryPtr->highlightWidth,
                entryPtr->borderWidth, entryPtr->relief);
    }
    if (entryPtr->highlightWidth != 0) {
        GC fgGC, bgGC;

        bgGC = Tk_GCForColor(entryPtr->highlightBgColorPtr, pixmap);
        if (entryPtr->flags & GOT_FOCUS) {
            fgGC = Tk_GCForColor(entryPtr->highlightColorPtr, pixmap);
            TkpDrawHighlightBorder(tkwin, fgGC, bgGC, 
                    entryPtr->highlightWidth, pixmap);
        } else {
            TkpDrawHighlightBorder(tkwin, bgGC, bgGC, 
                    entryPtr->highlightWidth, pixmap);
        }
    }

    /*
     * Everything's been redisplayed;  now copy the pixmap onto the screen
     * and free up the pixmap.
     */

    XCopyArea(entryPtr->display, pixmap, Tk_WindowId(tkwin), entryPtr->textGC,
            0, 0, (unsigned) Tk_Width(tkwin), (unsigned) Tk_Height(tkwin),
            0, 0);
    Tk_FreePixmap(entryPtr->display, pixmap);
    entryPtr->flags &= ~BORDER_NEEDED;
}

/*
 *----------------------------------------------------------------------
 *
 * EntryComputeGeometry --
 *
 *      This procedure is invoked to recompute information about where
 *      in its window an entry's string will be displayed.  It also
 *      computes the requested size for the window.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The leftX and tabOrigin fields are recomputed for entryPtr,
 *      and leftIndex may be adjusted.  Tk_GeometryRequest is called
 *      to register the desired dimensions for the window.
 *
 *----------------------------------------------------------------------
 */

static void
EntryComputeGeometry(entryPtr)
    Entry *entryPtr;            /* Widget record for entry. */
{
    int totalLength, overflow, maxOffScreen, rightX;
    int height, width, i;
    Tk_FontMetrics fm;
    char *p;

    if (entryPtr->displayString != entryPtr->string) {
        ckfree(entryPtr->displayString);
        entryPtr->displayString = entryPtr->string;
        entryPtr->numDisplayBytes = entryPtr->numBytes;
    }

    /*
     * If we're displaying a special character instead of the value of
     * the entry, recompute the displayString.
     */

    if (entryPtr->showChar != NULL) {
        Tcl_UniChar ch;
        char buf[TCL_UTF_MAX];
        int size;

        /*
         * Normalize the special character so we can safely duplicate it
         * in the display string.  If we didn't do this, then two malformed
         * characters might end up looking like one valid UTF character in
         * the resulting string.
         */

        Tcl_UtfToUniChar(entryPtr->showChar, &ch);
        size = Tcl_UniCharToUtf(ch, buf);

        entryPtr->numDisplayBytes = entryPtr->numChars * size;
        entryPtr->displayString =
                (char *) ckalloc((unsigned) (entryPtr->numDisplayBytes + 1));

        p = entryPtr->displayString;
        for (i = entryPtr->numChars; --i >= 0; ) {
            p += Tcl_UniCharToUtf(ch, p);
        }
        *p = '\0';
    }
    Tk_FreeTextLayout(entryPtr->textLayout);
    entryPtr->textLayout = Tk_ComputeTextLayout(entryPtr->tkfont,
            entryPtr->displayString, entryPtr->numChars, 0,
            entryPtr->justify, TK_IGNORE_NEWLINES, &totalLength, &height);

    entryPtr->layoutY = (Tk_Height(entryPtr->tkwin) - height) / 2;

    /*
     * Recompute where the leftmost character on the display will
     * be drawn (entryPtr->leftX) and adjust leftIndex if necessary
     * so that we don't let characters hang off the edge of the
     * window unless the entire window is full.
     */

    overflow = totalLength - (Tk_Width(entryPtr->tkwin) - 2*entryPtr->inset);
    if (overflow <= 0) {
        entryPtr->leftIndex = 0;
        if (entryPtr->justify == TK_JUSTIFY_LEFT) {
            entryPtr->leftX = entryPtr->inset;
        } else if (entryPtr->justify == TK_JUSTIFY_RIGHT) {
            entryPtr->leftX = Tk_Width(entryPtr->tkwin) - entryPtr->inset
                    - totalLength;
        } else {
            entryPtr->leftX = (Tk_Width(entryPtr->tkwin) - totalLength)/2;
        }
        entryPtr->layoutX = entryPtr->leftX;
    } else {
        /*
         * The whole string can't fit in the window.  Compute the
         * maximum number of characters that may be off-screen to
         * the left without leaving empty space on the right of the
         * window, then don't let leftIndex be any greater than that.
         */

        maxOffScreen = Tk_PointToChar(entryPtr->textLayout, overflow, 0);
        Tk_CharBbox(entryPtr->textLayout, maxOffScreen,
                &rightX, NULL, NULL, NULL);
        if (rightX < overflow) {
            maxOffScreen++;
        }
        if (entryPtr->leftIndex > maxOffScreen) {
            entryPtr->leftIndex = maxOffScreen;
        }
        Tk_CharBbox(entryPtr->textLayout, entryPtr->leftIndex, &rightX,
                NULL, NULL, NULL);
        entryPtr->leftX = entryPtr->inset;
        entryPtr->layoutX = entryPtr->leftX - rightX;
    }

    Tk_GetFontMetrics(entryPtr->tkfont, &fm);
    height = fm.linespace + 2*entryPtr->inset + 2*(YPAD-XPAD);
    if (entryPtr->prefWidth > 0) {
        width = entryPtr->prefWidth*entryPtr->avgWidth + 2*entryPtr->inset;
    } else {
        if (totalLength == 0) {
            width = entryPtr->avgWidth + 2*entryPtr->inset;
        } else {
            width = totalLength + 2*entryPtr->inset;
        }
    }
    Tk_GeometryRequest(entryPtr->tkwin, width, height);
}

/*
 *----------------------------------------------------------------------
 *
 * InsertChars --
 *
 *      Add new characters to an entry widget.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      New information gets added to entryPtr;  it will be redisplayed
 *      soon, but not necessarily immediately.
 *
 *----------------------------------------------------------------------
 */

static void
InsertChars(entryPtr, index, value)
    Entry *entryPtr;            /* Entry that is to get the new elements. */
    int index;                  /* Add the new elements before this
                                 * character index. */
    char *value;                /* New characters to add (NULL-terminated
                                 * string). */
{
    int byteIndex, byteCount, oldChars, charsAdded, newByteCount;
    char *new, *string;

    string = entryPtr->string;
    byteIndex = Tcl_UtfAtIndex(string, index) - string;
    byteCount = strlen(value);
    if (byteCount == 0) {
        return;
    }

    newByteCount = entryPtr->numBytes + byteCount + 1;
    new = (char *) ckalloc((unsigned) newByteCount);
    memcpy(new, string, (size_t) byteIndex);
    strcpy(new + byteIndex, value);
    strcpy(new + byteIndex + byteCount, string + byteIndex);

    if ((entryPtr->validate == VALIDATE_KEY ||
         entryPtr->validate == VALIDATE_ALL) &&
        EntryValidateChange(entryPtr, value, new, index,
                            VALIDATE_INSERT) != TCL_OK) {
        ckfree(new);
        return;
    }

    ckfree(string);
    entryPtr->string = new;

    /*
     * The following construction is used because inserting improperly
     * formed UTF-8 sequences between other improperly formed UTF-8
     * sequences could result in actually forming valid UTF-8 sequences;
     * the number of characters added may not be Tcl_NumUtfChars(string, -1),
     * because of context.  The actual number of characters added is how
     * many characters are in the string now minus the number that
     * used to be there.
     */

    oldChars = entryPtr->numChars;
    entryPtr->numChars = Tcl_NumUtfChars(new, -1);
    charsAdded = entryPtr->numChars - oldChars;
    entryPtr->numBytes += byteCount;

    if (entryPtr->displayString == string) {
        entryPtr->displayString = new;
        entryPtr->numDisplayBytes = entryPtr->numBytes;
    }

    /*
     * Inserting characters invalidates all indexes into the string.
     * Touch up the indexes so that they still refer to the same
     * characters (at new positions).  When updating the selection
     * end-points, don't include the new text in the selection unless
     * it was completely surrounded by the selection.
     */

    if (entryPtr->selectFirst >= index) {
        entryPtr->selectFirst += charsAdded;
    }
    if (entryPtr->selectLast > index) {
        entryPtr->selectLast += charsAdded;
    }
    if ((entryPtr->selectAnchor > index)
            || (entryPtr->selectFirst >= index)) {
        entryPtr->selectAnchor += charsAdded;
    }
    if (entryPtr->leftIndex > index) {
        entryPtr->leftIndex += charsAdded;
    }
    if (entryPtr->insertPos >= index) {
        entryPtr->insertPos += charsAdded;
    }
    EntryValueChanged(entryPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * DeleteChars --
 *
 *      Remove one or more characters from an entry widget.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Memory gets freed, the entry gets modified and (eventually)
 *      redisplayed.
 *
 *----------------------------------------------------------------------
 */

static void
DeleteChars(entryPtr, index, count)
    Entry *entryPtr;            /* Entry widget to modify. */
    int index;                  /* Index of first character to delete. */
    int count;                  /* How many characters to delete. */
{
    int byteIndex, byteCount, newByteCount;
    char *new, *string, *todelete;

    if ((index + count) > entryPtr->numChars) {
        count = entryPtr->numChars - index;
    }
    if (count <= 0) {
        return;
    }

    string = entryPtr->string;
    byteIndex = Tcl_UtfAtIndex(string, index) - string;
    byteCount = Tcl_UtfAtIndex(string + byteIndex, count) - (string + byteIndex);

    newByteCount = entryPtr->numBytes + 1 - byteCount;
    new = (char *) ckalloc((unsigned) newByteCount);
    memcpy(new, string, (size_t) byteIndex);
    strcpy(new + byteIndex, string + byteIndex + byteCount);

    todelete = (char *) ckalloc((unsigned) (byteCount + 1));
    memcpy(todelete, string + byteIndex, (size_t) byteCount);
    todelete[byteCount] = '\0';

    if ((entryPtr->validate == VALIDATE_KEY ||
         entryPtr->validate == VALIDATE_ALL) &&
        EntryValidateChange(entryPtr, todelete, new, index,
                            VALIDATE_DELETE) != TCL_OK) {
        ckfree(new);
        ckfree(todelete);
        return;
    }

    ckfree(todelete);
    ckfree(entryPtr->string);
    entryPtr->string = new;
    entryPtr->numChars -= count;
    entryPtr->numBytes -= byteCount;

    if (entryPtr->displayString == string) {
        entryPtr->displayString = new;
        entryPtr->numDisplayBytes = entryPtr->numBytes;
    }

    /*
     * Deleting characters results in the remaining characters being
     * renumbered.  Update the various indexes into the string to reflect
     * this change.
     */

    if (entryPtr->selectFirst >= index) {
        if (entryPtr->selectFirst >= (index + count)) {
            entryPtr->selectFirst -= count;
        } else {
            entryPtr->selectFirst = index;
        }
    }
    if (entryPtr->selectLast >= index) {
        if (entryPtr->selectLast >= (index + count)) {
            entryPtr->selectLast -= count;
        } else {
            entryPtr->selectLast = index;
        }
    }
    if (entryPtr->selectLast <= entryPtr->selectFirst) {
        entryPtr->selectFirst = -1;
        entryPtr->selectLast = -1;
    }
    if (entryPtr->selectAnchor >= index) {
        if (entryPtr->selectAnchor >= (index+count)) {
            entryPtr->selectAnchor -= count;
        } else {
            entryPtr->selectAnchor = index;
        }
    }
    if (entryPtr->leftIndex > index) {
        if (entryPtr->leftIndex >= (index + count)) {
            entryPtr->leftIndex -= count;
        } else {
            entryPtr->leftIndex = index;
        }
    }
    if (entryPtr->insertPos >= index) {
        if (entryPtr->insertPos >= (index + count)) {
            entryPtr->insertPos -= count;
        } else {
            entryPtr->insertPos = index;
        }
    }
    EntryValueChanged(entryPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * EntryValueChanged --
 *
 *      This procedure is invoked when characters are inserted into
 *      an entry or deleted from it.  It updates the entry's associated
 *      variable, if there is one, and does other bookkeeping such
 *      as arranging for redisplay.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

static void
EntryValueChanged(entryPtr)
    Entry *entryPtr;            /* Entry whose value just changed. */
{
    char *newValue;

    if (entryPtr->textVarName == NULL) {
        newValue = NULL;
    } else {
        newValue = Tcl_SetVar(entryPtr->interp, entryPtr->textVarName,
                entryPtr->string, TCL_GLOBAL_ONLY);
    }

    if ((newValue != NULL) && (strcmp(newValue, entryPtr->string) != 0)) {
        /*
         * The value of the variable is different than what we asked for.
         * This means that a trace on the variable modified it.  In this
         * case our trace procedure wasn't invoked since the modification
         * came while a trace was already active on the variable.  So,
         * update our value to reflect the variable's latest value.
         */

        EntrySetValue(entryPtr, newValue);
    } else {
        /*
         * Arrange for redisplay.
         */

        entryPtr->flags |= UPDATE_SCROLLBAR;
        EntryComputeGeometry(entryPtr);
        EventuallyRedraw(entryPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntrySetValue --
 *
 *      Replace the contents of a text entry with a given value.  This
 *      procedure is invoked when updating the entry from the entry's
 *      associated variable.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The string displayed in the entry will change.  The selection,
 *      insertion point, and view may have to be adjusted to keep them
 *      within the bounds of the new string.  Note: this procedure does
 *      *not* update the entry's associated variable, since that could
 *      result in an infinite loop.
 *
 *----------------------------------------------------------------------
 */

static void
EntrySetValue(entryPtr, value)
    Entry *entryPtr;            /* Entry whose value is to be changed. */
    char *value;                /* New text to display in entry. */
{
    char *oldSource;
    int code, valueLen, malloced = 0;

    if (strcmp(value, entryPtr->string) == 0) {
        return;
    }
    valueLen = strlen(value);

    if (entryPtr->flags & VALIDATE_VAR) {
        entryPtr->flags |= VALIDATE_ABORT;
    } else {
        /*
         * If we validate, we create a copy of the value, as it may
         * point to volatile memory, like the value of the -textvar
         * which may get freed during validation
         */
        oldSource = (char *) ckalloc((unsigned) (valueLen + 1));
        strcpy(oldSource, value);
        value = oldSource;
        malloced = 1;

        entryPtr->flags |= VALIDATE_VAR;
        code = EntryValidateChange(entryPtr, (char *) NULL, value, -1,
                VALIDATE_FORCED);
        entryPtr->flags &= ~VALIDATE_VAR;
        /*
         * If VALIDATE_ABORT has been set, then this operation should be
         * aborted because the validatecommand did something else instead
         */
        if (entryPtr->flags & VALIDATE_ABORT) {
            entryPtr->flags &= ~VALIDATE_ABORT;
            ckfree(value);
            return;
        }
    }

    oldSource = entryPtr->string;
    ckfree(entryPtr->string);

    if (malloced) {
        entryPtr->string = value;
    } else {
        entryPtr->string   = (char *) ckalloc((unsigned) (valueLen + 1));
        strcpy(entryPtr->string, value);
    }
    entryPtr->numBytes = valueLen;
    entryPtr->numChars = Tcl_NumUtfChars(value, valueLen);

    if (entryPtr->displayString == oldSource) {
        entryPtr->displayString = entryPtr->string;
        entryPtr->numDisplayBytes = entryPtr->numBytes;
    }

    if (entryPtr->selectFirst >= 0) {
        if (entryPtr->selectFirst >= entryPtr->numChars) {
            entryPtr->selectFirst = -1;
            entryPtr->selectLast = -1;
        } else if (entryPtr->selectLast > entryPtr->numChars) {
            entryPtr->selectLast = entryPtr->numChars;
        }
    }
    if (entryPtr->leftIndex >= entryPtr->numChars) {
        if (entryPtr->numChars > 0) {
            entryPtr->leftIndex = entryPtr->numChars - 1;
        } else {
            entryPtr->leftIndex = 0;
        }
    }
    if (entryPtr->insertPos > entryPtr->numChars) {
        entryPtr->insertPos = entryPtr->numChars;
    }

    entryPtr->flags |= UPDATE_SCROLLBAR;
    EntryComputeGeometry(entryPtr);
    EventuallyRedraw(entryPtr);
}

/*
 *--------------------------------------------------------------
 *
 * EntryEventProc --
 *
 *      This procedure is invoked by the Tk dispatcher for various
 *      events on entryes.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      When the window gets deleted, internal structures get
 *      cleaned up.  When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

static void
EntryEventProc(clientData, eventPtr)
    ClientData clientData;      /* Information about window. */
    XEvent *eventPtr;           /* Information about event. */
{
    Entry *entryPtr = (Entry *) clientData;
    if (eventPtr->type == Expose) {
        EventuallyRedraw(entryPtr);
        entryPtr->flags |= BORDER_NEEDED;
    } else if (eventPtr->type == DestroyNotify) {
        DestroyEntry((char *) clientData);
    } else if (eventPtr->type == ConfigureNotify) {
        Tcl_Preserve((ClientData) entryPtr);
        entryPtr->flags |= UPDATE_SCROLLBAR;
        EntryComputeGeometry(entryPtr);
        EventuallyRedraw(entryPtr);
        Tcl_Release((ClientData) entryPtr);
    } else if (eventPtr->type == FocusIn) {
        if (eventPtr->xfocus.detail != NotifyInferior) {
            EntryFocusProc(entryPtr, 1);
        }
    } else if (eventPtr->type == FocusOut) {
        if (eventPtr->xfocus.detail != NotifyInferior) {
            EntryFocusProc(entryPtr, 0);
        }
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntryCmdDeletedProc --
 *
 *      This procedure is invoked when a widget command is deleted.  If
 *      the widget isn't already in the process of being destroyed,
 *      this command destroys it.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The widget is destroyed.
 *
 *----------------------------------------------------------------------
 */

static void
EntryCmdDeletedProc(clientData)
    ClientData clientData;      /* Pointer to widget record for widget. */
{
    Entry *entryPtr = (Entry *) clientData;

    /*
     * This procedure could be invoked either because the window was
     * destroyed and the command was then deleted (in which case tkwin
     * is NULL) or because the command was deleted, and then this procedure
     * destroys the widget.
     */

    if (!(entryPtr->flags & ENTRY_DELETED)) {
        Tk_DestroyWindow(entryPtr->tkwin);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * GetEntryIndex --
 *
 *      Parse an index into an entry and return either its value
 *      or an error.
 *
 * Results:
 *      A standard Tcl result.  If all went well, then *indexPtr is
 *      filled in with the character index (into entryPtr) corresponding to
 *      string.  The index value is guaranteed to lie between 0 and
 *      the number of characters in the string, inclusive.  If an
 *      error occurs then an error message is left in the interp's result.
 *
 * Side effects:
 *      None.
 *
 *---------------------------------------------------------------------------
 */

static int
GetEntryIndex(interp, entryPtr, string, indexPtr)
    Tcl_Interp *interp;         /* For error messages. */
    Entry *entryPtr;            /* Entry for which the index is being
                                 * specified. */
    char *string;               /* Specifies character in entryPtr. */
    int *indexPtr;              /* Where to store converted character
                                 * index. */
{
    size_t length;

    length = strlen(string);

    if (string[0] == 'a') {
        if (strncmp(string, "anchor", length) == 0) {
            *indexPtr = entryPtr->selectAnchor;
        } else {
            badIndex:

            /*
             * Some of the paths here leave messages in the interp's result,
             * so we have to clear it out before storing our own message.
             */

            Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
            Tcl_AppendResult(interp, "bad entry index \"", string,
                    "\"", (char *) NULL);
            return TCL_ERROR;
        }
    } else if (string[0] == 'e') {
        if (strncmp(string, "end", length) == 0) {
            *indexPtr = entryPtr->numChars;
        } else {
            goto badIndex;
        }
    } else if (string[0] == 'i') {
        if (strncmp(string, "insert", length) == 0) {
            *indexPtr = entryPtr->insertPos;
        } else {
            goto badIndex;
        }
    } else if (string[0] == 's') {
        if (entryPtr->selectFirst < 0) {
            Tcl_SetResult(interp, "selection isn't in entry", TCL_STATIC);
            return TCL_ERROR;
        }
        if (length < 5) {
            goto badIndex;
        }
        if (strncmp(string, "sel.first", length) == 0) {
            *indexPtr = entryPtr->selectFirst;
        } else if (strncmp(string, "sel.last", length) == 0) {
            *indexPtr = entryPtr->selectLast;
        } else {
            goto badIndex;
        }
    } else if (string[0] == '@') {
        int x, roundUp;

        if (Tcl_GetInt(interp, string + 1, &x) != TCL_OK) {
            goto badIndex;
        }
        if (x < entryPtr->inset) {
            x = entryPtr->inset;
        }
        roundUp = 0;
        if (x >= (Tk_Width(entryPtr->tkwin) - entryPtr->inset)) {
            x = Tk_Width(entryPtr->tkwin) - entryPtr->inset - 1;
            roundUp = 1;
        }
        *indexPtr = Tk_PointToChar(entryPtr->textLayout,
                x - entryPtr->layoutX, 0);

        /*
         * Special trick:  if the x-position was off-screen to the right,
         * round the index up to refer to the character just after the
         * last visible one on the screen.  This is needed to enable the
         * last character to be selected, for example.
         */

        if (roundUp && (*indexPtr < entryPtr->numChars)) {
            *indexPtr += 1;
        }
    } else {
        if (Tcl_GetInt(interp, string, indexPtr) != TCL_OK) {
            goto badIndex;
        }
        if (*indexPtr < 0){
            *indexPtr = 0;
        } else if (*indexPtr > entryPtr->numChars) {
            *indexPtr = entryPtr->numChars;
        } 
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * EntryScanTo --
 *
 *      Given a y-coordinate (presumably of the curent mouse location)
 *      drag the view in the window to implement the scan operation.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The view in the window may change.
 *
 *----------------------------------------------------------------------
 */

static void
EntryScanTo(entryPtr, x)
    Entry *entryPtr;            /* Information about widget. */
    int x;                      /* X-coordinate to use for scan operation. */
{
    int newLeftIndex;

    /*
     * Compute new leftIndex for entry by amplifying the difference
     * between the current position and the place where the scan
     * started (the "mark" position).  If we run off the left or right
     * side of the entry, then reset the mark point so that the current
     * position continues to correspond to the edge of the window.
     * This means that the picture will start dragging as soon as the
     * mouse reverses direction (without this reset, might have to slide
     * mouse a long ways back before the picture starts moving again).
     */

    newLeftIndex = entryPtr->scanMarkIndex
            - (10 * (x - entryPtr->scanMarkX)) / entryPtr->avgWidth;
    if (newLeftIndex >= entryPtr->numChars) {
        newLeftIndex = entryPtr->scanMarkIndex = entryPtr->numChars - 1;
        entryPtr->scanMarkX = x;
    }
    if (newLeftIndex < 0) {
        newLeftIndex = entryPtr->scanMarkIndex = 0;
        entryPtr->scanMarkX = x;
    } 

    if (newLeftIndex != entryPtr->leftIndex) {
        entryPtr->leftIndex = newLeftIndex;
        entryPtr->flags |= UPDATE_SCROLLBAR;
        EntryComputeGeometry(entryPtr);
        if (newLeftIndex != entryPtr->leftIndex) {
            entryPtr->scanMarkIndex = entryPtr->leftIndex;
            entryPtr->scanMarkX = x;
        }
        EventuallyRedraw(entryPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntrySelectTo --
 *
 *      Modify the selection by moving its un-anchored end.  This could
 *      make the selection either larger or smaller.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The selection changes.
 *
 *----------------------------------------------------------------------
 */

static void
EntrySelectTo(entryPtr, index)
    Entry *entryPtr;            /* Information about widget. */
    int index;                  /* Character index of element that is to
                                 * become the "other" end of the selection. */
{
    int newFirst, newLast;

    /*
     * Grab the selection if we don't own it already.
     */

    if (!(entryPtr->flags & GOT_SELECTION) && (entryPtr->exportSelection)) {
        Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection,
                (ClientData) entryPtr);
        entryPtr->flags |= GOT_SELECTION;
    }

    /*
     * Pick new starting and ending points for the selection.
     */

    if (entryPtr->selectAnchor > entryPtr->numChars) {
        entryPtr->selectAnchor = entryPtr->numChars;
    }
    if (entryPtr->selectAnchor <= index) {
        newFirst = entryPtr->selectAnchor;
        newLast = index;
    } else {
        newFirst = index;
        newLast = entryPtr->selectAnchor;
        if (newLast < 0) {
            newFirst = newLast = -1;
        }
    }
    if ((entryPtr->selectFirst == newFirst)
            && (entryPtr->selectLast == newLast)) {
        return;
    }
    entryPtr->selectFirst = newFirst;
    entryPtr->selectLast = newLast;
    EventuallyRedraw(entryPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * EntryFetchSelection --
 *
 *      This procedure is called back by Tk when the selection is
 *      requested by someone.  It returns part or all of the selection
 *      in a buffer provided by the caller.
 *
 * Results:
 *      The return value is the number of non-NULL bytes stored
 *      at buffer.  Buffer is filled (or partially filled) with a
 *      NULL-terminated string containing part or all of the selection,
 *      as given by offset and maxBytes.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

static int
EntryFetchSelection(clientData, offset, buffer, maxBytes)
    ClientData clientData;      /* Information about entry widget. */
    int offset;                 /* Byte offset within selection of first
                                 * character to be returned. */
    char *buffer;               /* Location in which to place selection. */
    int maxBytes;               /* Maximum number of bytes to place at
                                 * buffer, not including terminating NULL
                                 * character. */
{
    Entry *entryPtr = (Entry *) clientData;
    int byteCount;
    char *string, *selStart, *selEnd;

    if ((entryPtr->selectFirst < 0) || !(entryPtr->exportSelection)) {
        return -1;
    }
    string = entryPtr->displayString;
    selStart = Tcl_UtfAtIndex(string, entryPtr->selectFirst);
    selEnd = Tcl_UtfAtIndex(selStart,
            entryPtr->selectLast - entryPtr->selectFirst);
    byteCount = selEnd - selStart - offset;
    if (byteCount > maxBytes) {
        byteCount = maxBytes;
    }
    if (byteCount <= 0) {
        return 0;
    }
    memcpy(buffer, selStart + offset, (size_t) byteCount);
    buffer[byteCount] = '\0';
    return byteCount;
}

/*
 *----------------------------------------------------------------------
 *
 * EntryLostSelection --
 *
 *      This procedure is called back by Tk when the selection is
 *      grabbed away from an entry widget.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The existing selection is unhighlighted, and the window is
 *      marked as not containing a selection.
 *
 *----------------------------------------------------------------------
 */

static void
EntryLostSelection(clientData)
    ClientData clientData;      /* Information about entry widget. */
{
    Entry *entryPtr = (Entry *) clientData;

    entryPtr->flags &= ~GOT_SELECTION;

    /*
     * On Windows and Mac systems, we want to remember the selection
     * for the next time the focus enters the window.  On Unix, we need
     * to clear the selection since it is always visible.
     */

#ifdef ALWAYS_SHOW_SELECTION
    if ((entryPtr->selectFirst >= 0) && entryPtr->exportSelection) {
        entryPtr->selectFirst = -1;
        entryPtr->selectLast = -1;
        EventuallyRedraw(entryPtr);
    }
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * EventuallyRedraw --
 *
 *      Ensure that an entry is eventually redrawn on the display.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Information gets redisplayed.  Right now we don't do selective
 *      redisplays:  the whole window will be redrawn.  This doesn't
 *      seem to hurt performance noticeably, but if it does then this
 *      could be changed.
 *
 *----------------------------------------------------------------------
 */

static void
EventuallyRedraw(entryPtr)
    Entry *entryPtr;            /* Information about widget. */
{
    if ((entryPtr->tkwin == NULL) || !Tk_IsMapped(entryPtr->tkwin)) {
        return;
    }

    /*
     * Right now we don't do selective redisplays:  the whole window
     * will be redrawn.  This doesn't seem to hurt performance noticeably,
     * but if it does then this could be changed.
     */

    if (!(entryPtr->flags & REDRAW_PENDING)) {
        entryPtr->flags |= REDRAW_PENDING;
        Tcl_DoWhenIdle(DisplayEntry, (ClientData) entryPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntryVisibleRange --
 *
 *      Return information about the range of the entry that is
 *      currently visible.
 *
 * Results:
 *      *firstPtr and *lastPtr are modified to hold fractions between
 *      0 and 1 identifying the range of characters visible in the
 *      entry.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

static void
EntryVisibleRange(entryPtr, firstPtr, lastPtr)
    Entry *entryPtr;            /* Information about widget. */
    double *firstPtr;           /* Return position of first visible
                                 * character in widget. */
    double *lastPtr;            /* Return position of char just after last
                                 * visible one. */
{
    int charsInWindow;

    if (entryPtr->numChars == 0) {
        *firstPtr = 0.0;
        *lastPtr = 1.0;
    } else {
        charsInWindow = Tk_PointToChar(entryPtr->textLayout,
                Tk_Width(entryPtr->tkwin) - entryPtr->inset
                        - entryPtr->layoutX - 1, 0);
        if (charsInWindow < entryPtr->numChars) {
            charsInWindow++;
        }
        charsInWindow -= entryPtr->leftIndex;
        if (charsInWindow == 0) {
            charsInWindow = 1;
        }

        *firstPtr = (double) entryPtr->leftIndex / entryPtr->numChars;
        *lastPtr = (double) (entryPtr->leftIndex + charsInWindow)
                / entryPtr->numChars;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntryUpdateScrollbar --
 *
 *      This procedure is invoked whenever information has changed in
 *      an entry in a way that would invalidate a scrollbar display.
 *      If there is an associated scrollbar, then this procedure updates
 *      it by invoking a Tcl command.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      A Tcl command is invoked, and an additional command may be
 *      invoked to process errors in the command.
 *
 *----------------------------------------------------------------------
 */

static void
EntryUpdateScrollbar(entryPtr)
    Entry *entryPtr;                    /* Information about widget. */
{
    char args[TCL_DOUBLE_SPACE * 2];
    int code;
    double first, last;
    Tcl_Interp *interp;

    if (entryPtr->scrollCmd == NULL) {
        return;
    }

    interp = entryPtr->interp;
    Tcl_Preserve((ClientData) interp);
    EntryVisibleRange(entryPtr, &first, &last);
    sprintf(args, " %g %g", first, last);
    code = Tcl_VarEval(interp, entryPtr->scrollCmd, args, (char *) NULL);
    if (code != TCL_OK) {
        Tcl_AddErrorInfo(interp,
                "\n    (horizontal scrolling command executed by entry)");
        Tcl_BackgroundError(interp);
    }
    Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
    Tcl_Release((ClientData) interp);
}

/*
 *----------------------------------------------------------------------
 *
 * EntryBlinkProc --
 *
 *      This procedure is called as a timer handler to blink the
 *      insertion cursor off and on.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The cursor gets turned on or off, redisplay gets invoked,
 *      and this procedure reschedules itself.
 *
 *----------------------------------------------------------------------
 */

static void
EntryBlinkProc(clientData)
    ClientData clientData;      /* Pointer to record describing entry. */
{
    Entry *entryPtr = (Entry *) clientData;

    if ((entryPtr->state == STATE_DISABLED) ||
            !(entryPtr->flags & GOT_FOCUS) || (entryPtr->insertOffTime == 0)) {
        return;
    }
    if (entryPtr->flags & CURSOR_ON) {
        entryPtr->flags &= ~CURSOR_ON;
        entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                entryPtr->insertOffTime, EntryBlinkProc, (ClientData) entryPtr);
    } else {
        entryPtr->flags |= CURSOR_ON;
        entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                entryPtr->insertOnTime, EntryBlinkProc, (ClientData) entryPtr);
    }
    EventuallyRedraw(entryPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * EntryFocusProc --
 *
 *      This procedure is called whenever the entry gets or loses the
 *      input focus.  It's also called whenever the window is reconfigured
 *      while it has the focus.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The cursor gets turned on or off.
 *
 *----------------------------------------------------------------------
 */

static void
EntryFocusProc(entryPtr, gotFocus)
    Entry *entryPtr;            /* Entry that got or lost focus. */
    int gotFocus;               /* 1 means window is getting focus, 0 means
                                 * it's losing it. */
{
    Tcl_DeleteTimerHandler(entryPtr->insertBlinkHandler);
    if (gotFocus) {
        entryPtr->flags |= GOT_FOCUS | CURSOR_ON;
        if (entryPtr->insertOffTime != 0) {
            entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                    entryPtr->insertOnTime, EntryBlinkProc,
                    (ClientData) entryPtr);
        }
        if (entryPtr->validate == VALIDATE_ALL ||
            entryPtr->validate == VALIDATE_FOCUS ||
            entryPtr->validate == VALIDATE_FOCUSIN) {
            EntryValidateChange(entryPtr, (char *) NULL,
                                entryPtr->string, -1, VALIDATE_FOCUSIN);
        }
    } else {
        entryPtr->flags &= ~(GOT_FOCUS | CURSOR_ON);
        entryPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
        if (entryPtr->validate == VALIDATE_ALL ||
            entryPtr->validate == VALIDATE_FOCUS ||
            entryPtr->validate == VALIDATE_FOCUSOUT) {
            EntryValidateChange(entryPtr, (char *) NULL,
                                entryPtr->string, -1, VALIDATE_FOCUSOUT);
        }
    }
    EventuallyRedraw(entryPtr);
}

/*
 *--------------------------------------------------------------
 *
 * EntryTextVarProc --
 *
 *      This procedure is invoked when someone changes the variable
 *      whose contents are to be displayed in an entry.
 *
 * Results:
 *      NULL is always returned.
 *
 * Side effects:
 *      The text displayed in the entry will change to match the
 *      variable.
 *
 *--------------------------------------------------------------
 */

        /* ARGSUSED */
static char *
EntryTextVarProc(clientData, interp, name1, name2, flags)
    ClientData clientData;      /* Information about button. */
    Tcl_Interp *interp;         /* Interpreter containing variable. */
    char *name1;                /* Not used. */
    char *name2;                /* Not used. */
    int flags;                  /* Information about what happened. */
{
    Entry *entryPtr = (Entry *) clientData;
    char *value;

    /*
     * If the variable is unset, then immediately recreate it unless
     * the whole interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
        if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
            Tcl_SetVar(interp, entryPtr->textVarName, entryPtr->string,
                    TCL_GLOBAL_ONLY);
            Tcl_TraceVar(interp, entryPtr->textVarName,
                    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                    EntryTextVarProc, clientData);
        }
        return (char *) NULL;
    }

    /*
     * Update the entry's text with the value of the variable, unless
     * the entry already has that value (this happens when the variable
     * changes value because we changed it because someone typed in
     * the entry).
     */

    value = Tcl_GetVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY);
    if (value == NULL) {
        value = "";
    }
    EntrySetValue(entryPtr, value);
    return (char *) NULL;
}

/*
 *--------------------------------------------------------------
 *
 * EntryValidate --
 *
 *      This procedure is invoked when any character is added or
 *      removed from the entry widget, or a focus has trigerred validation.
 *
 * Results:
 *      TCL_OK if the validatecommand passes the new string.
 *      TCL_BREAK if the vcmd executed OK, but rejects the string.
 *      TCL_ERROR if an error occurred while executing the vcmd
 *      or a valid Tcl_Bool is not returned.
 *
 * Side effects:
 *      An error condition may arise
 *
 *--------------------------------------------------------------
 */

static int
EntryValidate(entryPtr, cmd)
     register Entry *entryPtr;  /* Entry that needs validation. */
     register char *cmd;        /* Validation command (NULL-terminated
                                 * string). */
{
    register Tcl_Interp *interp = entryPtr->interp;
    int code, bool;

    code = Tcl_EvalEx(interp, cmd, -1, TCL_EVAL_GLOBAL | TCL_EVAL_DIRECT);

    if (code != TCL_OK && code != TCL_RETURN) {
        Tcl_AddErrorInfo(interp,
                         "\n\t(in validation command executed by entry)");
        Tcl_BackgroundError(interp);
        return TCL_ERROR;
    }

    if (Tcl_GetBooleanFromObj(interp, Tcl_GetObjResult(interp),
                              &bool) != TCL_OK) {
        Tcl_AddErrorInfo(interp,
                 "\nvalid boolean not returned by validation command");
        Tcl_BackgroundError(interp);
        Tcl_SetResult(interp, NULL, 0);
        return TCL_ERROR;
    }

    Tcl_SetResult(interp, NULL, 0);
    return (bool ? TCL_OK : TCL_BREAK);
}

/*
 *--------------------------------------------------------------
 *
 * EntryValidateChange --
 *
 *      This procedure is invoked when any character is added or
 *      removed from the entry widget, or a focus has trigerred validation.
 *
 * Results:
 *      TCL_OK if the validatecommand accepts the new string,
 *      TCL_ERROR if any problems occured with validatecommand.
 *
 * Side effects:
 *      The insertion/deletion may be aborted, and the
 *      validatecommand might turn itself off (if an error
 *      or loop condition arises).
 *
 *--------------------------------------------------------------
 */

static int
EntryValidateChange(entryPtr, change, new, index, type)
     register Entry *entryPtr;  /* Entry that needs validation. */
     char *change;              /* Characters to be added/deleted
                                 * (NULL-terminated string). */
     char *new;                 /* Potential new value of entry string */
     int index;                 /* index of insert/delete, -1 otherwise */
     int type;                  /* forced, delete, insert,
                                 * focusin or focusout */
{
    int code, varValidate = (entryPtr->flags & VALIDATE_VAR);
    char *p;
    Tcl_DString script;
    
    if (entryPtr->validateCmd == NULL ||
        entryPtr->validate == VALIDATE_NONE) {
        return (varValidate ? TCL_ERROR : TCL_OK);
    }

    /*
     * If we're already validating, then we're hitting a loop condition
     * Return and set validate to 0 to disallow further validations
     * and prevent current validation from finishing
     */
    if (entryPtr->flags & VALIDATING) {
        entryPtr->validate = VALIDATE_NONE;
        return (varValidate ? TCL_ERROR : TCL_OK);
    }

    entryPtr->flags |= VALIDATING;

    /*
     * Now form command string and run through the -validatecommand
     */

    Tcl_DStringInit(&script);
    ExpandPercents(entryPtr, entryPtr->validateCmd,
            change, new, index, type, &script);
    Tcl_DStringAppend(&script, "", 1);

    p = Tcl_DStringValue(&script);
    code = EntryValidate(entryPtr, p);
    Tcl_DStringFree(&script);

    /*
     * If e->validate has become VALIDATE_NONE during the validation, or
     * we now have VALIDATE_VAR set (from EntrySetValue) and didn't before,
     * it means that a loop condition almost occured.  Do not allow
     * this validation result to finish.
     */
    if (entryPtr->validate == VALIDATE_NONE
            || (!varValidate && (entryPtr->flags & VALIDATE_VAR))) {
        code = TCL_ERROR;
    }
    /*
     * If validate will return ERROR, then disallow further validations
     * Otherwise, if it didn't accept the new string (returned TCL_BREAK)
     * then eval the invalidCmd (if it's set)
     */
    if (code == TCL_ERROR) {
        entryPtr->validate = VALIDATE_NONE;
    } else if (code == TCL_BREAK) {
        /*
         * If we were doing forced validation (like via a variable
         * trace) and the command returned 0, the we turn off validation
         * because we assume that textvariables have precedence in
         * managing the value.  We also don't call the invcmd, as it
         * may want to do entry manipulation which the setting of the
         * var will later wipe anyway.
         */
        if (varValidate) {
            entryPtr->validate = VALIDATE_NONE;
        } else if (entryPtr->invalidCmd != NULL) {
            Tcl_DStringInit(&script);
            ExpandPercents(entryPtr, entryPtr->invalidCmd,
                           change, new, index, type, &script);
            Tcl_DStringAppend(&script, "", 1);
            p = Tcl_DStringValue(&script);
            if (Tcl_EvalEx(entryPtr->interp, p, -1,
                    TCL_EVAL_GLOBAL | TCL_EVAL_DIRECT) != TCL_OK) {
                Tcl_AddErrorInfo(entryPtr->interp,
                                 "\n\t(in invalidcommand executed by entry)");
                Tcl_BackgroundError(entryPtr->interp);
                code = TCL_ERROR;
                entryPtr->validate = VALIDATE_NONE;
            }
            Tcl_DStringFree(&script);
        }
    }

    entryPtr->flags &= ~VALIDATING;

    return code;
}

/*
 *--------------------------------------------------------------
 *
 * ExpandPercents --
 *
 *      Given a command and an event, produce a new command
 *      by replacing % constructs in the original command
 *      with information from the X event.
 *
 * Results:
 *      The new expanded command is appended to the dynamic string
 *      given by dsPtr.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

static void
ExpandPercents(entryPtr, before, change, new, index, type, dsPtr)
     register Entry *entryPtr;  /* Entry that needs validation. */
     register char *before;     /* Command containing percent
                                 * expressions to be replaced. */
     char *change;              /* Characters to added/deleted
                                 * (NULL-terminated string). */
     char *new;                 /* Potential new value of entry string */
     int index;                 /* index of insert/delete */
     int type;                  /* INSERT or DELETE */
     Tcl_DString *dsPtr;        /* Dynamic string in which to append
                                 * new command. */
{
    int spaceNeeded, cvtFlags;  /* Used to substitute string as proper Tcl
                                 * list element. */
    int number, length;
    register char *string;
    Tcl_UniChar ch;
    char numStorage[2*TCL_INTEGER_SPACE];

    while (1) {
        if (*before == '\0') {
            break;
        }
        /*
         * Find everything up to the next % character and append it
         * to the result string.
         */

        string = before;
        /* No need to convert '%', as it is in ascii range */
        string = Tcl_UtfFindFirst(before, '%');
        if (string == (char *) NULL) {
            Tcl_DStringAppend(dsPtr, before, -1);
            break;
        } else if (string != before) {
            Tcl_DStringAppend(dsPtr, before, string-before);
            before = string;
        }

        /*
         * There's a percent sequence here.  Process it.
         */

        before++; /* skip over % */
        if (*before != '\0') {
            before += Tcl_UtfToUniChar(before, &ch);
        } else {
            ch = '%';
        }
        switch (ch) {
        case 'd': /* Type of call that caused validation */
            switch (type) {
            case VALIDATE_INSERT:
                number = 1;
                break;
            case VALIDATE_DELETE:
                number = 0;
                break;
            default:
                number = -1;
                break;
            }
            sprintf(numStorage, "%d", number);
            string = numStorage;
            break;
        case 'i': /* index of insert/delete */
            sprintf(numStorage, "%d", index);
            string = numStorage;
            break;
        case 'P': /* 'Peeked' new value of the string */
            string = new;
            break;
        case 's': /* Current string value of entry */
            string = entryPtr->string;
            break;
        case 'S': /* string to be inserted/deleted, if any */
            string = change;
            break;
        case 'v': /* type of validation currently set */
            string = validateStrings[entryPtr->validate];
            break;
        case 'V': /* type of validation in effect */
            switch (type) {
            case VALIDATE_INSERT:
            case VALIDATE_DELETE:
                string = validateStrings[VALIDATE_KEY];
                break;
            case VALIDATE_FORCED:
                string = "forced";
                break;
            default:
                string = validateStrings[type];
                break;
            }
            break;
        case 'W': /* widget name */
            string = Tk_PathName(entryPtr->tkwin);
            break;
        default:
            length = Tcl_UniCharToUtf(ch, numStorage);
            numStorage[length] = '\0';
            string = numStorage;
            break;
        }

        spaceNeeded = Tcl_ScanCountedElement(string, -1, &cvtFlags);
        length = Tcl_DStringLength(dsPtr);
        Tcl_DStringSetLength(dsPtr, length + spaceNeeded);
        spaceNeeded = Tcl_ConvertCountedElement(string, -1,
                Tcl_DStringValue(dsPtr) + length,
                cvtFlags | TCL_DONT_USE_BRACES);
        Tcl_DStringSetLength(dsPtr, length + spaceNeeded);
    }
}

/* End of tkentry.c */