Initial revision

1 files changed, 2264 insertions, 0 deletions

diff --git a/generic/tkText.c b/generic/tkText.c
new file mode 100644
index 0000000..643aea0
--- /dev/null
+++ b/generic/tkText.c
@@ -0,0 +1,2264 @@
+/* 
+ * tkText.c --
+ *
+ *	This module provides a big chunk of the implementation of
+ *	multi-line editable text widgets for Tk.  Among other things,
+ *	it provides the Tcl command interfaces to text widgets and
+ *	the display code.  The B-tree representation of text is
+ *	implemented elsewhere.
+ *
+ * Copyright (c) 1992-1994 The Regents of the University of California.
+ * Copyright (c) 1994-1996 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) tkText.c 1.104 97/10/13 15:18:24
+ */
+
+#include "default.h"
+#include "tkPort.h"
+#include "tkInt.h"
+
+#ifdef MAC_TCL
+#define Style TkStyle
+#define DInfo TkDInfo
+#endif
+
+#include "tkText.h"
+
+/*
+ * Information used to parse text configuration options:
+ */
+
+static Tk_ConfigSpec configSpecs[] = {
+    {TK_CONFIG_BORDER, "-background", "background", "Background",
+	DEF_TEXT_BG_COLOR, Tk_Offset(TkText, border), TK_CONFIG_COLOR_ONLY},
+    {TK_CONFIG_BORDER, "-background", "background", "Background",
+	DEF_TEXT_BG_MONO, Tk_Offset(TkText, border), TK_CONFIG_MONO_ONLY},
+    {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
+	(char *) NULL, 0, 0},
+    {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
+	(char *) NULL, 0, 0},
+    {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
+	DEF_TEXT_BORDER_WIDTH, Tk_Offset(TkText, borderWidth), 0},
+    {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
+	DEF_TEXT_CURSOR, Tk_Offset(TkText, cursor), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_BOOLEAN, "-exportselection", "exportSelection",
+	"ExportSelection", DEF_TEXT_EXPORT_SELECTION,
+	Tk_Offset(TkText, exportSelection), 0},
+    {TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
+	(char *) NULL, 0, 0},
+    {TK_CONFIG_FONT, "-font", "font", "Font",
+	DEF_TEXT_FONT, Tk_Offset(TkText, tkfont), 0},
+    {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
+	DEF_TEXT_FG, Tk_Offset(TkText, fgColor), 0},
+    {TK_CONFIG_PIXELS, "-height", "height", "Height",
+	DEF_TEXT_HEIGHT, Tk_Offset(TkText, height), 0},
+    {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
+	"HighlightBackground", DEF_TEXT_HIGHLIGHT_BG,
+	Tk_Offset(TkText, highlightBgColorPtr), 0},
+    {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
+	DEF_TEXT_HIGHLIGHT, Tk_Offset(TkText, highlightColorPtr), 0},
+    {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
+	"HighlightThickness",
+	DEF_TEXT_HIGHLIGHT_WIDTH, Tk_Offset(TkText, highlightWidth), 0},
+    {TK_CONFIG_BORDER, "-insertbackground", "insertBackground", "Foreground",
+	DEF_TEXT_INSERT_BG, Tk_Offset(TkText, insertBorder), 0},
+    {TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
+	DEF_TEXT_INSERT_BD_COLOR, Tk_Offset(TkText, insertBorderWidth),
+	TK_CONFIG_COLOR_ONLY},
+    {TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
+	DEF_TEXT_INSERT_BD_MONO, Tk_Offset(TkText, insertBorderWidth),
+	TK_CONFIG_MONO_ONLY},
+    {TK_CONFIG_INT, "-insertofftime", "insertOffTime", "OffTime",
+	DEF_TEXT_INSERT_OFF_TIME, Tk_Offset(TkText, insertOffTime), 0},
+    {TK_CONFIG_INT, "-insertontime", "insertOnTime", "OnTime",
+	DEF_TEXT_INSERT_ON_TIME, Tk_Offset(TkText, insertOnTime), 0},
+    {TK_CONFIG_PIXELS, "-insertwidth", "insertWidth", "InsertWidth",
+	DEF_TEXT_INSERT_WIDTH, Tk_Offset(TkText, insertWidth), 0},
+    {TK_CONFIG_PIXELS, "-padx", "padX", "Pad",
+	DEF_TEXT_PADX, Tk_Offset(TkText, padX), 0},
+    {TK_CONFIG_PIXELS, "-pady", "padY", "Pad",
+	DEF_TEXT_PADY, Tk_Offset(TkText, padY), 0},
+    {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
+	DEF_TEXT_RELIEF, Tk_Offset(TkText, relief), 0},
+    {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
+	DEF_TEXT_SELECT_COLOR, Tk_Offset(TkText, selBorder),
+	TK_CONFIG_COLOR_ONLY},
+    {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
+	DEF_TEXT_SELECT_MONO, Tk_Offset(TkText, selBorder),
+	TK_CONFIG_MONO_ONLY},
+    {TK_CONFIG_STRING, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
+	DEF_TEXT_SELECT_BD_COLOR, Tk_Offset(TkText, selBdString),
+	TK_CONFIG_COLOR_ONLY|TK_CONFIG_NULL_OK},
+    {TK_CONFIG_STRING, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
+	DEF_TEXT_SELECT_BD_MONO, Tk_Offset(TkText, selBdString),
+	TK_CONFIG_MONO_ONLY|TK_CONFIG_NULL_OK},
+    {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
+	DEF_TEXT_SELECT_FG_COLOR, Tk_Offset(TkText, selFgColorPtr),
+	TK_CONFIG_COLOR_ONLY},
+    {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
+	DEF_TEXT_SELECT_FG_MONO, Tk_Offset(TkText, selFgColorPtr),
+	TK_CONFIG_MONO_ONLY},
+    {TK_CONFIG_BOOLEAN, "-setgrid", "setGrid", "SetGrid",
+	DEF_TEXT_SET_GRID, Tk_Offset(TkText, setGrid), 0},
+    {TK_CONFIG_PIXELS, "-spacing1", "spacing1", "Spacing",
+	DEF_TEXT_SPACING1, Tk_Offset(TkText, spacing1),
+	TK_CONFIG_DONT_SET_DEFAULT},
+    {TK_CONFIG_PIXELS, "-spacing2", "spacing2", "Spacing",
+	DEF_TEXT_SPACING2, Tk_Offset(TkText, spacing2),
+	TK_CONFIG_DONT_SET_DEFAULT},
+    {TK_CONFIG_PIXELS, "-spacing3", "spacing3", "Spacing",
+	DEF_TEXT_SPACING3, Tk_Offset(TkText, spacing3),
+	TK_CONFIG_DONT_SET_DEFAULT},
+    {TK_CONFIG_UID, "-state", "state", "State",
+	DEF_TEXT_STATE, Tk_Offset(TkText, state), 0},
+    {TK_CONFIG_STRING, "-tabs", "tabs", "Tabs",
+	DEF_TEXT_TABS, Tk_Offset(TkText, tabOptionString), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
+	DEF_TEXT_TAKE_FOCUS, Tk_Offset(TkText, takeFocus),
+	TK_CONFIG_NULL_OK},
+    {TK_CONFIG_INT, "-width", "width", "Width",
+	DEF_TEXT_WIDTH, Tk_Offset(TkText, width), 0},
+    {TK_CONFIG_UID, "-wrap", "wrap", "Wrap",
+	DEF_TEXT_WRAP, Tk_Offset(TkText, wrapMode), 0},
+    {TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
+	DEF_TEXT_XSCROLL_COMMAND, Tk_Offset(TkText, xScrollCmd),
+	TK_CONFIG_NULL_OK},
+    {TK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
+	DEF_TEXT_YSCROLL_COMMAND, Tk_Offset(TkText, yScrollCmd),
+	TK_CONFIG_NULL_OK},
+    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
+	(char *) NULL, 0, 0}
+};
+
+/*
+ * Tk_Uid's used to represent text states:
+ */
+
+Tk_Uid tkTextCharUid = NULL;
+Tk_Uid tkTextDisabledUid = NULL;
+Tk_Uid tkTextNoneUid = NULL;
+Tk_Uid tkTextNormalUid = NULL;
+Tk_Uid tkTextWordUid = NULL;
+
+/*
+ * Boolean variable indicating whether or not special debugging code
+ * should be executed.
+ */
+
+int tkTextDebug = 0;
+
+/*
+ * Forward declarations for procedures defined later in this file:
+ */
+
+static int		ConfigureText _ANSI_ARGS_((Tcl_Interp *interp,
+			    TkText *textPtr, int argc, char **argv, int flags));
+static int		DeleteChars _ANSI_ARGS_((TkText *textPtr,
+			    char *index1String, char *index2String));
+static void		DestroyText _ANSI_ARGS_((char *memPtr));
+static void		InsertChars _ANSI_ARGS_((TkText *textPtr,
+			    TkTextIndex *indexPtr, char *string));
+static void		TextBlinkProc _ANSI_ARGS_((ClientData clientData));
+static void		TextCmdDeletedProc _ANSI_ARGS_((
+			    ClientData clientData));
+static void		TextEventProc _ANSI_ARGS_((ClientData clientData,
+			    XEvent *eventPtr));
+static int		TextFetchSelection _ANSI_ARGS_((ClientData clientData,
+			    int offset, char *buffer, int maxBytes));
+static int		TextSearchCmd _ANSI_ARGS_((TkText *textPtr,
+			    Tcl_Interp *interp, int argc, char **argv));
+static int		TextWidgetCmd _ANSI_ARGS_((ClientData clientData,
+			    Tcl_Interp *interp, int argc, char **argv));
+static void		TextWorldChanged _ANSI_ARGS_((
+			    ClientData instanceData));
+static int		TextDumpCmd _ANSI_ARGS_((TkText *textPtr,
+			    Tcl_Interp *interp, int argc, char **argv));
+static void		DumpLine _ANSI_ARGS_((Tcl_Interp *interp, 
+			    TkText *textPtr, int what, TkTextLine *linePtr,
+			    int start, int end, int lineno, char *command));
+static int		DumpSegment _ANSI_ARGS_((Tcl_Interp *interp, char *key,
+			    char *value, char * command, int lineno, int offset,
+			    int what));
+
+/*
+ * The structure below defines text class behavior by means of procedures
+ * that can be invoked from generic window code.
+ */
+
+static TkClassProcs textClass = {
+    NULL,			/* createProc. */
+    TextWorldChanged,		/* geometryProc. */
+    NULL			/* modalProc. */
+};
+
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Tk_TextCmd --
+ *
+ *	This procedure is invoked to process the "text" 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_TextCmd(clientData, interp, argc, argv)
+    ClientData clientData;	/* Main window associated with
+				 * interpreter. */
+    Tcl_Interp *interp;		/* Current interpreter. */
+    int argc;			/* Number of arguments. */
+    char **argv;		/* Argument strings. */
+{
+    Tk_Window tkwin = (Tk_Window) clientData;
+    Tk_Window new;
+    register TkText *textPtr;
+    TkTextIndex startIndex;
+
+    if (argc < 2) {
+	Tcl_AppendResult(interp, "wrong # args: should be \"",
+		argv[0], " pathName ?options?\"", (char *) NULL);
+	return TCL_ERROR;
+    }
+
+    /*
+     * Perform once-only initialization:
+     */
+
+    if (tkTextNormalUid == NULL) {
+	tkTextCharUid = Tk_GetUid("char");
+	tkTextDisabledUid = Tk_GetUid("disabled");
+	tkTextNoneUid = Tk_GetUid("none");
+	tkTextNormalUid = Tk_GetUid("normal");
+	tkTextWordUid = Tk_GetUid("word");
+    }
+
+    /*
+     * Create the window.
+     */
+
+    new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
+    if (new == NULL) {
+	return TCL_ERROR;
+    }
+
+    textPtr = (TkText *) ckalloc(sizeof(TkText));
+    textPtr->tkwin = new;
+    textPtr->display = Tk_Display(new);
+    textPtr->interp = interp;
+    textPtr->widgetCmd = Tcl_CreateCommand(interp,
+	    Tk_PathName(textPtr->tkwin), TextWidgetCmd,
+	    (ClientData) textPtr, TextCmdDeletedProc);
+    textPtr->tree = TkBTreeCreate(textPtr);
+    Tcl_InitHashTable(&textPtr->tagTable, TCL_STRING_KEYS);
+    textPtr->numTags = 0;
+    Tcl_InitHashTable(&textPtr->markTable, TCL_STRING_KEYS);
+    Tcl_InitHashTable(&textPtr->windowTable, TCL_STRING_KEYS);
+    Tcl_InitHashTable(&textPtr->imageTable, TCL_STRING_KEYS);
+    textPtr->state = tkTextNormalUid;
+    textPtr->border = NULL;
+    textPtr->borderWidth = 0;
+    textPtr->padX = 0;
+    textPtr->padY = 0;
+    textPtr->relief = TK_RELIEF_FLAT;
+    textPtr->highlightWidth = 0;
+    textPtr->highlightBgColorPtr = NULL;
+    textPtr->highlightColorPtr = NULL;
+    textPtr->cursor = None;
+    textPtr->fgColor = NULL;
+    textPtr->tkfont = NULL;
+    textPtr->charWidth = 1;
+    textPtr->spacing1 = 0;
+    textPtr->spacing2 = 0;
+    textPtr->spacing3 = 0;
+    textPtr->tabOptionString = NULL;
+    textPtr->tabArrayPtr = NULL;
+    textPtr->wrapMode = tkTextCharUid;
+    textPtr->width = 0;
+    textPtr->height = 0;
+    textPtr->setGrid = 0;
+    textPtr->prevWidth = Tk_Width(new);
+    textPtr->prevHeight = Tk_Height(new);
+    TkTextCreateDInfo(textPtr);
+    TkTextMakeIndex(textPtr->tree, 0, 0, &startIndex);
+    TkTextSetYView(textPtr, &startIndex, 0);
+    textPtr->selTagPtr = NULL;
+    textPtr->selBorder = NULL;
+    textPtr->selBdString = NULL;
+    textPtr->selFgColorPtr = NULL;
+    textPtr->exportSelection = 1;
+    textPtr->abortSelections = 0;
+    textPtr->insertMarkPtr = NULL;
+    textPtr->insertBorder = NULL;
+    textPtr->insertWidth = 0;
+    textPtr->insertBorderWidth = 0;
+    textPtr->insertOnTime = 0;
+    textPtr->insertOffTime = 0;
+    textPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
+    textPtr->bindingTable = NULL;
+    textPtr->currentMarkPtr = NULL;
+    textPtr->pickEvent.type = LeaveNotify;
+    textPtr->pickEvent.xcrossing.x = 0;
+    textPtr->pickEvent.xcrossing.y = 0;
+    textPtr->numCurTags = 0;
+    textPtr->curTagArrayPtr = NULL;
+    textPtr->takeFocus = NULL;
+    textPtr->xScrollCmd = NULL;
+    textPtr->yScrollCmd = NULL;
+    textPtr->flags = 0;
+
+    /*
+     * Create the "sel" tag and the "current" and "insert" marks.
+     */
+
+    textPtr->selTagPtr = TkTextCreateTag(textPtr, "sel");
+    textPtr->selTagPtr->reliefString = (char *) ckalloc(7);
+    strcpy(textPtr->selTagPtr->reliefString, DEF_TEXT_SELECT_RELIEF);
+    textPtr->selTagPtr->relief = TK_RELIEF_RAISED;
+    textPtr->currentMarkPtr = TkTextSetMark(textPtr, "current", &startIndex);
+    textPtr->insertMarkPtr = TkTextSetMark(textPtr, "insert", &startIndex);
+
+    Tk_SetClass(textPtr->tkwin, "Text");
+    TkSetClassProcs(textPtr->tkwin, &textClass, (ClientData) textPtr);
+    Tk_CreateEventHandler(textPtr->tkwin,
+	    ExposureMask|StructureNotifyMask|FocusChangeMask,
+	    TextEventProc, (ClientData) textPtr);
+    Tk_CreateEventHandler(textPtr->tkwin, KeyPressMask|KeyReleaseMask
+	    |ButtonPressMask|ButtonReleaseMask|EnterWindowMask
+	    |LeaveWindowMask|PointerMotionMask|VirtualEventMask,
+	    TkTextBindProc, (ClientData) textPtr);
+    Tk_CreateSelHandler(textPtr->tkwin, XA_PRIMARY, XA_STRING,
+	    TextFetchSelection, (ClientData) textPtr, XA_STRING);
+    if (ConfigureText(interp, textPtr, argc-2, argv+2, 0) != TCL_OK) {
+	Tk_DestroyWindow(textPtr->tkwin);
+	return TCL_ERROR;
+    }
+    interp->result = Tk_PathName(textPtr->tkwin);
+
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * TextWidgetCmd --
+ *
+ *	This procedure is invoked to process the Tcl command
+ *	that corresponds to a text widget.  See the user
+ *	documentation for details on what it does.
+ *
+ * Results:
+ *	A standard Tcl result.
+ *
+ * Side effects:
+ *	See the user documentation.
+ *
+ *--------------------------------------------------------------
+ */
+
+static int
+TextWidgetCmd(clientData, interp, argc, argv)
+    ClientData clientData;	/* Information about text widget. */
+    Tcl_Interp *interp;		/* Current interpreter. */
+    int argc;			/* Number of arguments. */
+    char **argv;		/* Argument strings. */
+{
+    register TkText *textPtr = (TkText *) clientData;
+    int result = TCL_OK;
+    size_t length;
+    int c;
+    TkTextIndex index1, index2;
+
+    if (argc < 2) {
+	Tcl_AppendResult(interp, "wrong # args: should be \"",
+		argv[0], " option ?arg arg ...?\"", (char *) NULL);
+	return TCL_ERROR;
+    }
+    Tcl_Preserve((ClientData) textPtr);
+    c = argv[1][0];
+    length = strlen(argv[1]);
+    if ((c == 'b') && (strncmp(argv[1], "bbox", length) == 0)) {
+	int x, y, width, height;
+
+	if (argc != 3) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0], " bbox index\"", (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (TkTextCharBbox(textPtr, &index1, &x, &y, &width, &height) == 0) {
+	    sprintf(interp->result, "%d %d %d %d", x, y, width, height);
+	}
+    } else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
+	    && (length >= 2)) {
+	if (argc != 3) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0], " cget option\"",
+		    (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	result = Tk_ConfigureValue(interp, textPtr->tkwin, configSpecs,
+		(char *) textPtr, argv[2], 0);
+    } else if ((c == 'c') && (strncmp(argv[1], "compare", length) == 0)
+	    && (length >= 3)) {
+	int relation, value;
+	char *p;
+
+	if (argc != 5) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0], " compare index1 op index2\"", (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if ((TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK)
+		|| (TkTextGetIndex(interp, textPtr, argv[4], &index2)
+		!= TCL_OK)) {
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	relation = TkTextIndexCmp(&index1, &index2);
+	p = argv[3];
+	if (p[0] == '<') {
+		value = (relation < 0);
+	    if ((p[1] == '=') && (p[2] == 0)) {
+		value = (relation <= 0);
+	    } else if (p[1] != 0) {
+		compareError:
+		Tcl_AppendResult(interp, "bad comparison operator \"",
+			argv[3], "\": must be <, <=, ==, >=, >, or !=",
+			(char *) NULL);
+		result = TCL_ERROR;
+		goto done;
+	    }
+	} else if (p[0] == '>') {
+		value = (relation > 0);
+	    if ((p[1] == '=') && (p[2] == 0)) {
+		value = (relation >= 0);
+	    } else if (p[1] != 0) {
+		goto compareError;
+	    }
+	} else if ((p[0] == '=') && (p[1] == '=') && (p[2] == 0)) {
+	    value = (relation == 0);
+	} else if ((p[0] == '!') && (p[1] == '=') && (p[2] == 0)) {
+	    value = (relation != 0);
+	} else {
+	    goto compareError;
+	}
+	interp->result = (value) ? "1" : "0";
+    } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
+	    && (length >= 3)) {
+	if (argc == 2) {
+	    result = Tk_ConfigureInfo(interp, textPtr->tkwin, configSpecs,
+		    (char *) textPtr, (char *) NULL, 0);
+	} else if (argc == 3) {
+	    result = Tk_ConfigureInfo(interp, textPtr->tkwin, configSpecs,
+		    (char *) textPtr, argv[2], 0);
+	} else {
+	    result = ConfigureText(interp, textPtr, argc-2, argv+2,
+		    TK_CONFIG_ARGV_ONLY);
+	}
+    } else if ((c == 'd') && (strncmp(argv[1], "debug", length) == 0)
+	    && (length >= 3)) {
+	if (argc > 3) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0], " debug boolean\"", (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (argc == 2) {
+	    interp->result = (tkBTreeDebug) ? "1" : "0";
+	} else {
+	    if (Tcl_GetBoolean(interp, argv[2], &tkBTreeDebug) != TCL_OK) {
+		result = TCL_ERROR;
+		goto done;
+	    }
+	    tkTextDebug = tkBTreeDebug;
+	}
+    } else if ((c == 'd') && (strncmp(argv[1], "delete", length) == 0)
+	    && (length >= 3)) {
+	if ((argc != 3) && (argc != 4)) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0], " delete index1 ?index2?\"", (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (textPtr->state == tkTextNormalUid) {
+	    result = DeleteChars(textPtr, argv[2],
+		    (argc == 4) ? argv[3] : (char *) NULL);
+	}
+    } else if ((c == 'd') && (strncmp(argv[1], "dlineinfo", length) == 0)
+	    && (length >= 2)) {
+	int x, y, width, height, base;
+
+	if (argc != 3) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0], " dlineinfo index\"", (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (TkTextDLineInfo(textPtr, &index1, &x, &y, &width, &height, &base)
+		== 0) {
+	    sprintf(interp->result, "%d %d %d %d %d", x, y, width,
+		    height, base);
+	}
+    } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
+	if ((argc != 3) && (argc != 4)) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0], " get index1 ?index2?\"", (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (argc == 3) {
+	    index2 = index1;
+	    TkTextIndexForwChars(&index2, 1, &index2);
+	} else if (TkTextGetIndex(interp, textPtr, argv[3], &index2)
+		!= TCL_OK) {
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (TkTextIndexCmp(&index1, &index2) >= 0) {
+	    goto done;
+	}
+	while (1) {
+	    int offset, last, savedChar;
+	    TkTextSegment *segPtr;
+
+	    segPtr = TkTextIndexToSeg(&index1, &offset);
+	    last = segPtr->size;
+	    if (index1.linePtr == index2.linePtr) {
+		int last2;
+
+		if (index2.charIndex == index1.charIndex) {
+		    break;
+		}
+		last2 = index2.charIndex - index1.charIndex + offset;
+		if (last2 < last) {
+		    last = last2;
+		}
+	    }
+	    if (segPtr->typePtr == &tkTextCharType) {
+		savedChar = segPtr->body.chars[last];
+		segPtr->body.chars[last] = 0;
+		Tcl_AppendResult(interp, segPtr->body.chars + offset,
+			(char *) NULL);
+		segPtr->body.chars[last] = savedChar;
+	    }
+	    TkTextIndexForwChars(&index1, last-offset, &index1);
+	}
+    } else if ((c == 'i') && (strncmp(argv[1], "index", length) == 0)
+	    && (length >= 3)) {
+	if (argc != 3) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0], " index index\"",
+		    (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	TkTextPrintIndex(&index1, interp->result);
+    } else if ((c == 'i') && (strncmp(argv[1], "insert", length) == 0)
+	    && (length >= 3)) {
+	int i, j, numTags;
+	char **tagNames;
+	TkTextTag **oldTagArrayPtr;
+
+	if (argc < 4) {
+	    Tcl_AppendResult(interp, "wrong # args: should be \"",
+		    argv[0],
+		    " insert index chars ?tagList chars tagList ...?\"",
+		    (char *) NULL);
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
+	    result = TCL_ERROR;
+	    goto done;
+	}
+	if (textPtr->state == tkTextNormalUid) {
+	    for (j = 3;  j < argc; j += 2) {
+		InsertChars(textPtr, &index1, argv[j]);
+		if (argc > (j+1)) {
+		    TkTextIndexForwChars(&index1, (int) strlen(argv[j]),
+			    &index2);
+		    oldTagArrayPtr = TkBTreeGetTags(&index1, &numTags);
+		    if (oldTagArrayPtr != NULL) {
+			for (i = 0; i < numTags; i++) {
+			    TkBTreeTag(&index1, &index2, oldTagArrayPtr[i], 0);
+			}
+			ckfree((char *) oldTagArrayPtr);
+		    }
+		    if (Tcl_SplitList(interp, argv[j+1], &numTags, &tagNames)
+			    != TCL_OK) {
+			result = TCL_ERROR;
+			goto done;
+		    }
+		    for (i = 0; i < numTags; i++) {
+			TkBTreeTag(&index1, &index2,
+				TkTextCreateTag(textPtr, tagNames[i]), 1);
+		    }
+		    ckfree((char *) tagNames);
+		    index1 = index2;
+		}
+	    }
+	}
+    } else if ((c == 'd') && (strncmp(argv[1], "dump", length) == 0)) {
+	result = TextDumpCmd(textPtr, interp, argc, argv);
+    } else if ((c == 'i') && (strncmp(argv[1], "image", length) == 0)) {
+	result = TkTextImageCmd(textPtr, interp, argc, argv);
+    } else if ((c == 'm') && (strncmp(argv[1], "mark", length) == 0)) {
+	result = TkTextMarkCmd(textPtr, interp, argc, argv);
+    } else if ((c == 's') && (strcmp(argv[1], "scan") == 0) && (length >= 2)) {
+	result = TkTextScanCmd(textPtr, interp, argc, argv);
+    } else if ((c == 's') && (strcmp(argv[1], "search") == 0)
+	    && (length >= 3)) {
+	result = TextSearchCmd(textPtr, interp, argc, argv);
+    } else if ((c == 's') && (strcmp(argv[1], "see") == 0) && (length >= 3)) {
+	result = TkTextSeeCmd(textPtr, interp, argc, argv);
+    } else if ((c == 't') && (strcmp(argv[1], "tag") == 0)) {
+	result = TkTextTagCmd(textPtr, interp, argc, argv);
+    } else if ((c == 'w') && (strncmp(argv[1], "window", length) == 0)) {
+	result = TkTextWindowCmd(textPtr, interp, argc, argv);
+    } else if ((c == 'x') && (strncmp(argv[1], "xview", length) == 0)) {
+	result = TkTextXviewCmd(textPtr, interp, argc, argv);
+    } else if ((c == 'y') && (strncmp(argv[1], "yview", length) == 0)
+	    && (length >= 2)) {
+	result = TkTextYviewCmd(textPtr, interp, argc, argv);
+    } else {
+	Tcl_AppendResult(interp, "bad option \"", argv[1],
+		"\": must be bbox, cget, compare, configure, debug, delete, ",
+		"dlineinfo, get, image, index, insert, mark, scan, search, see, ",
+		"tag, window, xview, or yview",
+		(char *) NULL);
+	result = TCL_ERROR;
+    }
+
+    done:
+    Tcl_Release((ClientData) textPtr);
+    return result;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * DestroyText --
+ *
+ *	This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
+ *	to clean up the internal structure of a text at a safe time
+ *	(when no-one is using it anymore).
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	Everything associated with the text is freed up.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+DestroyText(memPtr)
+    char *memPtr;		/* Info about text widget. */
+{
+    register TkText *textPtr = (TkText *) memPtr;
+    Tcl_HashSearch search;
+    Tcl_HashEntry *hPtr;
+    TkTextTag *tagPtr;
+
+    /*
+     * Free up all the stuff that requires special handling, then
+     * let Tk_FreeOptions handle all the standard option-related
+     * stuff.  Special note:  free up display-related information
+     * before deleting the B-tree, since display-related stuff
+     * may refer to stuff in the B-tree.
+     */
+
+    TkTextFreeDInfo(textPtr);
+    TkBTreeDestroy(textPtr->tree);
+    for (hPtr = Tcl_FirstHashEntry(&textPtr->tagTable, &search);
+	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
+	tagPtr = (TkTextTag *) Tcl_GetHashValue(hPtr);
+	TkTextFreeTag(textPtr, tagPtr);
+    }
+    Tcl_DeleteHashTable(&textPtr->tagTable);
+    for (hPtr = Tcl_FirstHashEntry(&textPtr->markTable, &search);
+	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
+	ckfree((char *) Tcl_GetHashValue(hPtr));
+    }
+    Tcl_DeleteHashTable(&textPtr->markTable);
+    if (textPtr->tabArrayPtr != NULL) {
+	ckfree((char *) textPtr->tabArrayPtr);
+    }
+    if (textPtr->insertBlinkHandler != NULL) {
+	Tcl_DeleteTimerHandler(textPtr->insertBlinkHandler);
+    }
+    if (textPtr->bindingTable != NULL) {
+	Tk_DeleteBindingTable(textPtr->bindingTable);
+    }
+
+    /*
+     * NOTE: do NOT free up selBorder, selBdString, or selFgColorPtr:
+     * they are duplicates of information in the "sel" tag, which was
+     * freed up as part of deleting the tags above.
+     */
+
+    textPtr->selBorder = NULL;
+    textPtr->selBdString = NULL;
+    textPtr->selFgColorPtr = NULL;
+    Tk_FreeOptions(configSpecs, (char *) textPtr, textPtr->display, 0);
+    ckfree((char *) textPtr);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ConfigureText --
+ *
+ *	This procedure is called to process an argv/argc list, plus
+ *	the Tk option database, in order to configure (or
+ *	reconfigure) a text widget.
+ *
+ * Results:
+ *	The return value is a standard Tcl result.  If TCL_ERROR is
+ *	returned, then interp->result contains an error message.
+ *
+ * Side effects:
+ *	Configuration information, such as text string, colors, font,
+ *	etc. get set for textPtr;  old resources get freed, if there
+ *	were any.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+ConfigureText(interp, textPtr, argc, argv, flags)
+    Tcl_Interp *interp;		/* Used for error reporting. */
+    register TkText *textPtr;	/* Information about widget;  may or may
+				 * not already have values for some fields. */
+    int argc;			/* Number of valid entries in argv. */
+    char **argv;		/* Arguments. */
+    int flags;			/* Flags to pass to Tk_ConfigureWidget. */
+{
+    int oldExport = textPtr->exportSelection;
+
+    if (Tk_ConfigureWidget(interp, textPtr->tkwin, configSpecs,
+	    argc, argv, (char *) textPtr, flags) != TCL_OK) {
+	return TCL_ERROR;
+    }
+
+    /*
+     * A few other options also need special processing, such as parsing
+     * the geometry and setting the background from a 3-D border.
+     */
+
+    if ((textPtr->state != tkTextNormalUid)
+	    && (textPtr->state != tkTextDisabledUid)) {
+	Tcl_AppendResult(interp, "bad state value \"", textPtr->state,
+		"\": must be normal or disabled", (char *) NULL);
+	textPtr->state = tkTextNormalUid;
+	return TCL_ERROR;
+    }
+
+    if ((textPtr->wrapMode != tkTextCharUid)
+	    && (textPtr->wrapMode != tkTextNoneUid)
+	    && (textPtr->wrapMode != tkTextWordUid)) {
+	Tcl_AppendResult(interp, "bad wrap mode \"", textPtr->wrapMode,
+		"\": must be char, none, or word", (char *) NULL);
+	textPtr->wrapMode = tkTextCharUid;
+	return TCL_ERROR;
+    }
+
+    Tk_SetBackgroundFromBorder(textPtr->tkwin, textPtr->border);
+
+    /*
+     * Don't allow negative spacings.
+     */
+
+    if (textPtr->spacing1 < 0) {
+	textPtr->spacing1 = 0;
+    }
+    if (textPtr->spacing2 < 0) {
+	textPtr->spacing2 = 0;
+    }
+    if (textPtr->spacing3 < 0) {
+	textPtr->spacing3 = 0;
+    }
+
+    /*
+     * Parse tab stops.
+     */
+
+    if (textPtr->tabArrayPtr != NULL) {
+	ckfree((char *) textPtr->tabArrayPtr);
+	textPtr->tabArrayPtr = NULL;
+    }
+    if (textPtr->tabOptionString != NULL) {
+	textPtr->tabArrayPtr = TkTextGetTabs(interp, textPtr->tkwin,
+		textPtr->tabOptionString);
+	if (textPtr->tabArrayPtr == NULL) {
+	    Tcl_AddErrorInfo(interp,"\n    (while processing -tabs option)");
+	    return TCL_ERROR;
+	}
+    }
+
+    /*
+     * Make sure that configuration options are properly mirrored
+     * between the widget record and the "sel" tags.  NOTE: we don't
+     * have to free up information during the mirroring;  old
+     * information was freed when it was replaced in the widget
+     * record.
+     */
+
+    textPtr->selTagPtr->border = textPtr->selBorder;
+    if (textPtr->selTagPtr->bdString != textPtr->selBdString) {
+	textPtr->selTagPtr->bdString = textPtr->selBdString;
+	if (textPtr->selBdString != NULL) {
+	    if (Tk_GetPixels(interp, textPtr->tkwin, textPtr->selBdString,
+		    &textPtr->selTagPtr->borderWidth) != TCL_OK) {
+		return TCL_ERROR;
+	    }
+	    if (textPtr->selTagPtr->borderWidth < 0) {
+		textPtr->selTagPtr->borderWidth = 0;
+	    }
+	}
+    }
+    textPtr->selTagPtr->fgColor = textPtr->selFgColorPtr;
+    textPtr->selTagPtr->affectsDisplay = 0;
+    if ((textPtr->selTagPtr->border != NULL)
+	    || (textPtr->selTagPtr->bdString != NULL)
+	    || (textPtr->selTagPtr->reliefString != NULL)
+	    || (textPtr->selTagPtr->bgStipple != None)
+	    || (textPtr->selTagPtr->fgColor != NULL)
+	    || (textPtr->selTagPtr->tkfont != None)
+	    || (textPtr->selTagPtr->fgStipple != None)
+	    || (textPtr->selTagPtr->justifyString != NULL)
+	    || (textPtr->selTagPtr->lMargin1String != NULL)
+	    || (textPtr->selTagPtr->lMargin2String != NULL)
+	    || (textPtr->selTagPtr->offsetString != NULL)
+	    || (textPtr->selTagPtr->overstrikeString != NULL)
+	    || (textPtr->selTagPtr->rMarginString != NULL)
+	    || (textPtr->selTagPtr->spacing1String != NULL)
+	    || (textPtr->selTagPtr->spacing2String != NULL)
+	    || (textPtr->selTagPtr->spacing3String != NULL)
+	    || (textPtr->selTagPtr->tabString != NULL)
+	    || (textPtr->selTagPtr->underlineString != NULL)
+	    || (textPtr->selTagPtr->wrapMode != NULL)) {
+	textPtr->selTagPtr->affectsDisplay = 1;
+    }
+    TkTextRedrawTag(textPtr, (TkTextIndex *) NULL, (TkTextIndex *) NULL,
+	    textPtr->selTagPtr, 1);
+
+    /*
+     * Claim the selection if we've suddenly started exporting it and there
+     * are tagged characters.
+     */
+
+    if (textPtr->exportSelection && (!oldExport)) {
+	TkTextSearch search;
+	TkTextIndex first, last;
+
+	TkTextMakeIndex(textPtr->tree, 0, 0, &first);
+	TkTextMakeIndex(textPtr->tree,
+		TkBTreeNumLines(textPtr->tree), 0, &last);
+	TkBTreeStartSearch(&first, &last, textPtr->selTagPtr, &search);
+	if (TkBTreeCharTagged(&first, textPtr->selTagPtr)
+		|| TkBTreeNextTag(&search)) {
+	    Tk_OwnSelection(textPtr->tkwin, XA_PRIMARY, TkTextLostSelection,
+		    (ClientData) textPtr);
+	    textPtr->flags |= GOT_SELECTION;
+	}
+    }
+
+    /*
+     * Register the desired geometry for the window, and arrange for
+     * the window to be redisplayed.
+     */
+
+    if (textPtr->width <= 0) {
+	textPtr->width = 1;
+    }
+    if (textPtr->height <= 0) {
+	textPtr->height = 1;
+    }
+    TextWorldChanged((ClientData) textPtr);
+    return TCL_OK;
+}
+
+/*
+ *---------------------------------------------------------------------------
+ *
+ * TextWorldChanged --
+ *
+ *      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:
+ *	Configures all tags in the Text with a empty argc/argv, for
+ *	the side effect of causing all the items to recompute their
+ *	geometry and to be redisplayed.
+ *
+ *---------------------------------------------------------------------------
+ */
+ 
+static void
+TextWorldChanged(instanceData)
+    ClientData instanceData;	/* Information about widget. */
+{
+    TkText *textPtr;
+    Tk_FontMetrics fm;
+
+    textPtr = (TkText *) instanceData;
+
+    textPtr->charWidth = Tk_TextWidth(textPtr->tkfont, "0", 1);
+    if (textPtr->charWidth <= 0) {
+	textPtr->charWidth = 1;
+    }
+    Tk_GetFontMetrics(textPtr->tkfont, &fm);
+    Tk_GeometryRequest(textPtr->tkwin,
+	    textPtr->width * textPtr->charWidth + 2*textPtr->borderWidth
+		    + 2*textPtr->padX + 2*textPtr->highlightWidth,
+	    textPtr->height * (fm.linespace + textPtr->spacing1
+		    + textPtr->spacing3) + 2*textPtr->borderWidth
+		    + 2*textPtr->padY + 2*textPtr->highlightWidth);
+    Tk_SetInternalBorder(textPtr->tkwin,
+	    textPtr->borderWidth + textPtr->highlightWidth);
+    if (textPtr->setGrid) {
+	Tk_SetGrid(textPtr->tkwin, textPtr->width, textPtr->height,
+		textPtr->charWidth, fm.linespace);
+    } else {
+	Tk_UnsetGrid(textPtr->tkwin);
+    }
+
+    TkTextRelayoutWindow(textPtr);
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * TextEventProc --
+ *
+ *	This procedure is invoked by the Tk dispatcher on
+ *	structure changes to a text.  For texts with 3D
+ *	borders, this procedure is also invoked for exposures.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	When the window gets deleted, internal structures get
+ *	cleaned up.  When it gets exposed, it is redisplayed.
+ *
+ *--------------------------------------------------------------
+ */
+
+static void
+TextEventProc(clientData, eventPtr)
+    ClientData clientData;	/* Information about window. */
+    register XEvent *eventPtr;	/* Information about event. */
+{
+    register TkText *textPtr = (TkText *) clientData;
+    TkTextIndex index, index2;
+
+    if (eventPtr->type == Expose) {
+	TkTextRedrawRegion(textPtr, eventPtr->xexpose.x,
+		eventPtr->xexpose.y, eventPtr->xexpose.width,
+		eventPtr->xexpose.height);
+    } else if (eventPtr->type == ConfigureNotify) {
+	if ((textPtr->prevWidth != Tk_Width(textPtr->tkwin))
+		|| (textPtr->prevHeight != Tk_Height(textPtr->tkwin))) {
+	    TkTextRelayoutWindow(textPtr);
+	    textPtr->prevWidth = Tk_Width(textPtr->tkwin);
+	    textPtr->prevHeight = Tk_Height(textPtr->tkwin);
+	}
+    } else if (eventPtr->type == DestroyNotify) {
+	if (textPtr->tkwin != NULL) {
+	    if (textPtr->setGrid) {
+		Tk_UnsetGrid(textPtr->tkwin);
+	    }
+	    textPtr->tkwin = NULL;
+	    Tcl_DeleteCommandFromToken(textPtr->interp,
+		    textPtr->widgetCmd);
+	}
+	Tcl_EventuallyFree((ClientData) textPtr, DestroyText);
+    } else if ((eventPtr->type == FocusIn) || (eventPtr->type == FocusOut)) {
+	if (eventPtr->xfocus.detail != NotifyInferior) {
+	    Tcl_DeleteTimerHandler(textPtr->insertBlinkHandler);
+	    if (eventPtr->type == FocusIn) {
+		textPtr->flags |= GOT_FOCUS | INSERT_ON;
+		if (textPtr->insertOffTime != 0) {
+		    textPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
+			    textPtr->insertOnTime, TextBlinkProc,
+			    (ClientData) textPtr);
+		}
+	    } else {
+		textPtr->flags &= ~(GOT_FOCUS | INSERT_ON);
+		textPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
+	    }
+#ifndef ALWAYS_SHOW_SELECTION
+	    TkTextRedrawTag(textPtr, NULL, NULL, textPtr->selTagPtr, 1);
+#endif
+	    TkTextMarkSegToIndex(textPtr, textPtr->insertMarkPtr, &index);
+	    TkTextIndexForwChars(&index, 1, &index2);
+	    TkTextChanged(textPtr, &index, &index2);
+	    if (textPtr->highlightWidth > 0) {
+		TkTextRedrawRegion(textPtr, 0, 0, textPtr->highlightWidth,
+			textPtr->highlightWidth);
+	    }
+	}
+    }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TextCmdDeletedProc --
+ *
+ *	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
+TextCmdDeletedProc(clientData)
+    ClientData clientData;	/* Pointer to widget record for widget. */
+{
+    TkText *textPtr = (TkText *) clientData;
+    Tk_Window tkwin = textPtr->tkwin;
+
+    /*
+     * 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 (tkwin != NULL) {
+	if (textPtr->setGrid) {
+	    Tk_UnsetGrid(textPtr->tkwin);
+	}
+	textPtr->tkwin = NULL;
+	Tk_DestroyWindow(tkwin);
+    }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * InsertChars --
+ *
+ *	This procedure implements most of the functionality of the
+ *	"insert" widget command.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The characters in "string" get added to the text just before
+ *	the character indicated by "indexPtr".
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+InsertChars(textPtr, indexPtr, string)
+    TkText *textPtr;		/* Overall information about text widget. */
+    TkTextIndex *indexPtr;	/* Where to insert new characters.  May be
+				 * modified and/or invalidated. */
+    char *string;		/* Null-terminated string containing new
+				 * information to add to text. */
+{
+    int lineIndex, resetView, offset;
+    TkTextIndex newTop;
+
+    /*
+     * Don't allow insertions on the last (dummy) line of the text.
+     */
+
+    lineIndex = TkBTreeLineIndex(indexPtr->linePtr);
+    if (lineIndex == TkBTreeNumLines(textPtr->tree)) {
+	lineIndex--;
+	TkTextMakeIndex(textPtr->tree, lineIndex, 1000000, indexPtr);
+    }
+
+    /*
+     * Notify the display module that lines are about to change, then do
+     * the insertion.  If the insertion occurs on the top line of the
+     * widget (textPtr->topIndex), then we have to recompute topIndex
+     * after the insertion, since the insertion could invalidate it.
+     */
+
+    resetView = offset = 0;
+    if (indexPtr->linePtr == textPtr->topIndex.linePtr) {
+	resetView = 1;
+	offset = textPtr->topIndex.charIndex;
+	if (offset > indexPtr->charIndex) {
+	    offset += strlen(string);
+	}
+    }
+    TkTextChanged(textPtr, indexPtr, indexPtr);
+    TkBTreeInsertChars(indexPtr, string);
+    if (resetView) {
+	TkTextMakeIndex(textPtr->tree, lineIndex, 0, &newTop);
+	TkTextIndexForwChars(&newTop, offset, &newTop);
+	TkTextSetYView(textPtr, &newTop, 0);
+    }
+
+    /*
+     * Invalidate any selection retrievals in progress.
+     */
+
+    textPtr->abortSelections = 1;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * DeleteChars --
+ *
+ *	This procedure implements most of the functionality of the
+ *	"delete" widget command.
+ *
+ * Results:
+ *	Returns a standard Tcl result, and leaves an error message
+ *	in textPtr->interp if there is an error.
+ *
+ * Side effects:
+ *	Characters get deleted from the text.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+DeleteChars(textPtr, index1String, index2String)
+    TkText *textPtr;		/* Overall information about text widget. */
+    char *index1String;		/* String describing location of first
+				 * character to delete. */
+    char *index2String;		/* String describing location of last
+				 * character to delete.  NULL means just
+				 * delete the one character given by
+				 * index1String. */
+{
+    int line1, line2, line, charIndex, resetView;
+    TkTextIndex index1, index2;
+
+    /*
+     * Parse the starting and stopping indices.
+     */
+
+    if (TkTextGetIndex(textPtr->interp, textPtr, index1String, &index1)
+	    != TCL_OK) {
+	return TCL_ERROR;
+    }
+    if (index2String != NULL) {
+	if (TkTextGetIndex(textPtr->interp, textPtr, index2String, &index2)
+		!= TCL_OK) {
+	    return TCL_ERROR;
+	}
+    } else {
+	index2 = index1;
+	TkTextIndexForwChars(&index2, 1, &index2);
+    }
+
+    /*
+     * Make sure there's really something to delete.
+     */
+
+    if (TkTextIndexCmp(&index1, &index2) >= 0) {
+	return TCL_OK;
+    }
+
+    /*
+     * The code below is ugly, but it's needed to make sure there
+     * is always a dummy empty line at the end of the text.  If the
+     * final newline of the file (just before the dummy line) is being
+     * deleted, then back up index to just before the newline.  If
+     * there is a newline just before the first character being deleted,
+     * then back up the first index too, so that an even number of lines
+     * gets deleted.  Furthermore, remove any tags that are present on
+     * the newline that isn't going to be deleted after all (this simulates
+     * deleting the newline and then adding a "clean" one back again).
+     */
+
+    line1 = TkBTreeLineIndex(index1.linePtr);
+    line2 = TkBTreeLineIndex(index2.linePtr);
+    if (line2 == TkBTreeNumLines(textPtr->tree)) {
+	TkTextTag **arrayPtr;
+	int arraySize, i;
+	TkTextIndex oldIndex2;
+
+	oldIndex2 = index2;
+	TkTextIndexBackChars(&oldIndex2, 1, &index2);
+	line2--;
+	if ((index1.charIndex == 0) && (line1 != 0)) {
+	    TkTextIndexBackChars(&index1, 1, &index1);
+	    line1--;
+	}
+	arrayPtr = TkBTreeGetTags(&index2, &arraySize);
+	if (arrayPtr != NULL) {
+	    for (i = 0; i < arraySize; i++) {
+		TkBTreeTag(&index2, &oldIndex2, arrayPtr[i], 0);
+	    }
+	    ckfree((char *) arrayPtr);
+	}
+    }
+
+    /*
+     * Tell the display what's about to happen so it can discard
+     * obsolete display information, then do the deletion.  Also,
+     * if the deletion involves the top line on the screen, then
+     * we have to reset the view (the deletion will invalidate
+     * textPtr->topIndex).  Compute what the new first character
+     * will be, then do the deletion, then reset the view.
+     */
+
+    TkTextChanged(textPtr, &index1, &index2);
+    resetView = line = charIndex = 0;
+    if (TkTextIndexCmp(&index2, &textPtr->topIndex) >= 0) {
+	if (TkTextIndexCmp(&index1, &textPtr->topIndex) <= 0) {
+	    /*
+	     * Deletion range straddles topIndex: use the beginning
+	     * of the range as the new topIndex.
+	     */
+
+	    resetView = 1;
+	    line = line1;
+	    charIndex = index1.charIndex;
+	} else if (index1.linePtr == textPtr->topIndex.linePtr) {
+	    /*
+	     * Deletion range starts on top line but after topIndex.
+	     * Use the current topIndex as the new one.
+	     */
+
+	    resetView = 1;
+	    line = line1;
+	    charIndex = textPtr->topIndex.charIndex;
+	}
+    } else if (index2.linePtr == textPtr->topIndex.linePtr) {
+	/*
+	 * Deletion range ends on top line but before topIndex.
+	 * Figure out what will be the new character index for
+	 * the character currently pointed to by topIndex.
+	 */
+
+	resetView = 1;
+	line = line2;
+	charIndex = textPtr->topIndex.charIndex;
+	if (index1.linePtr != index2.linePtr) {
+	    charIndex -= index2.charIndex;
+	} else {
+	    charIndex -= (index2.charIndex - index1.charIndex);
+	}
+    }
+    TkBTreeDeleteChars(&index1, &index2);
+    if (resetView) {
+	TkTextMakeIndex(textPtr->tree, line, charIndex, &index1);
+	TkTextSetYView(textPtr, &index1, 0);
+    }
+
+    /*
+     * Invalidate any selection retrievals in progress.
+     */
+
+    textPtr->abortSelections = 1;
+
+    return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TextFetchSelection --
+ *
+ *	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
+TextFetchSelection(clientData, offset, buffer, maxBytes)
+    ClientData clientData;		/* Information about text widget. */
+    int offset;				/* 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. */
+{
+    register TkText *textPtr = (TkText *) clientData;
+    TkTextIndex eof;
+    int count, chunkSize, offsetInSeg;
+    TkTextSearch search;
+    TkTextSegment *segPtr;
+
+    if (!textPtr->exportSelection) {
+	return -1;
+    }
+
+    /*
+     * Find the beginning of the next range of selected text.  Note:  if
+     * the selection is being retrieved in multiple pieces (offset != 0)
+     * and some modification has been made to the text that affects the
+     * selection then reject the selection request (make 'em start over
+     * again).
+     */
+
+    if (offset == 0) {
+	TkTextMakeIndex(textPtr->tree, 0, 0, &textPtr->selIndex);
+	textPtr->abortSelections = 0;
+    } else if (textPtr->abortSelections) {
+	return 0;
+    }
+    TkTextMakeIndex(textPtr->tree, TkBTreeNumLines(textPtr->tree), 0, &eof);
+    TkBTreeStartSearch(&textPtr->selIndex, &eof, textPtr->selTagPtr, &search);
+    if (!TkBTreeCharTagged(&textPtr->selIndex, textPtr->selTagPtr)) {
+	if (!TkBTreeNextTag(&search)) {
+	    if (offset == 0) {
+		return -1;
+	    } else {
+		return 0;
+	    }
+	}
+	textPtr->selIndex = search.curIndex;
+    }
+
+    /*
+     * Each iteration through the outer loop below scans one selected range.
+     * Each iteration through the inner loop scans one segment in the
+     * selected range.
+     */
+
+    count = 0;
+    while (1) {
+	/*
+	 * Find the end of the current range of selected text.
+	 */
+
+	if (!TkBTreeNextTag(&search)) {
+	    panic("TextFetchSelection couldn't find end of range");
+	}
+
+	/*
+	 * Copy information from character segments into the buffer
+	 * until either we run out of space in the buffer or we get
+	 * to the end of this range of text.
+	 */
+
+	while (1) {
+	    if (maxBytes == 0) {
+		goto done;
+	    }
+	    segPtr = TkTextIndexToSeg(&textPtr->selIndex, &offsetInSeg);
+	    chunkSize = segPtr->size - offsetInSeg;
+	    if (chunkSize > maxBytes) {
+		chunkSize = maxBytes;
+	    }
+	    if (textPtr->selIndex.linePtr == search.curIndex.linePtr) {
+		int leftInRange;
+
+		leftInRange = search.curIndex.charIndex
+			- textPtr->selIndex.charIndex;
+		if (leftInRange < chunkSize) {
+		    chunkSize = leftInRange;
+		    if (chunkSize <= 0) {
+			break;
+		    }
+		}
+	    }
+	    if (segPtr->typePtr == &tkTextCharType) {
+		memcpy((VOID *) buffer, (VOID *) (segPtr->body.chars
+			+ offsetInSeg), (size_t) chunkSize);
+		buffer += chunkSize;
+		maxBytes -= chunkSize;
+		count += chunkSize;
+	    }
+	    TkTextIndexForwChars(&textPtr->selIndex, chunkSize,
+		    &textPtr->selIndex);
+	}
+
+	/*
+	 * Find the beginning of the next range of selected text.
+	 */
+
+	if (!TkBTreeNextTag(&search)) {
+	    break;
+	}
+	textPtr->selIndex = search.curIndex;
+    }
+
+    done:
+    *buffer = 0;
+    return count;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkTextLostSelection --
+ *
+ *	This procedure is called back by Tk when the selection is
+ *	grabbed away from a text widget.  On Windows and Mac systems, we
+ *	want to remember the selection for the next time the focus
+ *	enters the window.  On Unix, just remove the "sel" tag from
+ *	everything in the widget.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	The "sel" tag is cleared from the window.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TkTextLostSelection(clientData)
+    ClientData clientData;		/* Information about text widget. */
+{
+    register TkText *textPtr = (TkText *) clientData;
+#ifdef ALWAYS_SHOW_SELECTION
+    TkTextIndex start, end;
+
+    if (!textPtr->exportSelection) {
+	return;
+    }
+
+    /*
+     * On Windows and Mac systems, we want to remember the selection
+     * for the next time the focus enters the window.  On Unix, 
+     * just remove the "sel" tag from everything in the widget.
+     */
+
+    TkTextMakeIndex(textPtr->tree, 0, 0, &start);
+    TkTextMakeIndex(textPtr->tree, TkBTreeNumLines(textPtr->tree), 0, &end);
+    TkTextRedrawTag(textPtr, &start, &end, textPtr->selTagPtr, 1);
+    TkBTreeTag(&start, &end, textPtr->selTagPtr, 0);
+#endif
+    textPtr->flags &= ~GOT_SELECTION;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TextBlinkProc --
+ *
+ *	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
+TextBlinkProc(clientData)
+    ClientData clientData;	/* Pointer to record describing text. */
+{
+    register TkText *textPtr = (TkText *) clientData;
+    TkTextIndex index;
+    int x, y, w, h;
+
+    if (!(textPtr->flags & GOT_FOCUS) || (textPtr->insertOffTime == 0)) {
+	return;
+    }
+    if (textPtr->flags & INSERT_ON) {
+	textPtr->flags &= ~INSERT_ON;
+	textPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
+		textPtr->insertOffTime, TextBlinkProc, (ClientData) textPtr);
+    } else {
+	textPtr->flags |= INSERT_ON;
+	textPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
+		textPtr->insertOnTime, TextBlinkProc, (ClientData) textPtr);
+    }
+    TkTextMarkSegToIndex(textPtr, textPtr->insertMarkPtr, &index);
+    TkTextCharBbox(textPtr, &index, &x, &y, &w, &h);
+    TkTextRedrawRegion(textPtr, x - textPtr->insertWidth / 2, y,
+	    textPtr->insertWidth, h);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TextSearchCmd --
+ *
+ *	This procedure is invoked to process the "search" widget command
+ *	for text widgets.  See the user documentation for details on what
+ *	it does.
+ *
+ * Results:
+ *	A standard Tcl result.
+ *
+ * Side effects:
+ *	See the user documentation.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+TextSearchCmd(textPtr, interp, argc, argv)
+    TkText *textPtr;		/* Information about text widget. */
+    Tcl_Interp *interp;		/* Current interpreter. */
+    int argc;			/* Number of arguments. */
+    char **argv;		/* Argument strings. */
+{
+    int backwards, exact, c, i, argsLeft, noCase, leftToScan;
+    size_t length;
+    int numLines, startingLine, startingChar, lineNum, firstChar, lastChar;
+    int code, matchLength, matchChar, passes, stopLine, searchWholeText;
+    int patLength;
+    char *arg, *pattern, *varName, *p, *startOfLine;
+    char buffer[20];
+    TkTextIndex index, stopIndex;
+    Tcl_DString line, patDString;
+    TkTextSegment *segPtr;
+    TkTextLine *linePtr;
+    Tcl_RegExp regexp = NULL;		/* Initialization needed only to
+					 * prevent compiler warning. */
+
+    /*
+     * Parse switches and other arguments.
+     */
+
+    exact = 1;
+    backwards = 0;
+    noCase = 0;
+    varName = NULL;
+    for (i = 2; i < argc; i++) {
+	arg = argv[i];
+	if (arg[0] != '-') {
+	    break;
+	}
+	length = strlen(arg);
+	if (length < 2) {
+	    badSwitch:
+	    Tcl_AppendResult(interp, "bad switch \"", arg,
+		    "\": must be -forward, -backward, -exact, -regexp, ",
+		    "-nocase, -count, or --", (char *) NULL);
+	    return TCL_ERROR;
+	}
+	c = arg[1];
+	if ((c == 'b') && (strncmp(argv[i], "-backwards", length) == 0)) {
+	    backwards = 1;
+	} else if ((c == 'c') && (strncmp(argv[i], "-count", length) == 0)) {
+	    if (i >= (argc-1)) {
+		interp->result = "no value given for \"-count\" option";
+		return TCL_ERROR;
+	    }
+	    i++;
+	    varName = argv[i];
+	} else if ((c == 'e') && (strncmp(argv[i], "-exact", length) == 0)) {
+	    exact = 1;
+	} else if ((c == 'f') && (strncmp(argv[i], "-forwards", length) == 0)) {
+	    backwards = 0;
+	} else if ((c == 'n') && (strncmp(argv[i], "-nocase", length) == 0)) {
+	    noCase = 1;
+	} else if ((c == 'r') && (strncmp(argv[i], "-regexp", length) == 0)) {
+	    exact = 0;
+	} else if ((c == '-') && (strncmp(argv[i], "--", length) == 0)) {
+	    i++;
+	    break;
+	} else {
+	    goto badSwitch;
+	}
+    }
+    argsLeft = argc - (i+2);
+    if ((argsLeft != 0) && (argsLeft != 1)) {
+	Tcl_AppendResult(interp, "wrong # args: should be \"",
+		argv[0], " search ?switches? pattern index ?stopIndex?",
+		(char *) NULL);
+	return TCL_ERROR;
+    }
+    pattern = argv[i];
+
+    /*
+     * Convert the pattern to lower-case if we're supposed to ignore case.
+     */
+
+    if (noCase) {
+	Tcl_DStringInit(&patDString);
+	Tcl_DStringAppend(&patDString, pattern, -1);
+	pattern = Tcl_DStringValue(&patDString);
+	for (p = pattern; *p != 0; p++) {
+	    if (isupper(UCHAR(*p))) {
+		*p = tolower(UCHAR(*p));
+	    }
+	}
+    }
+
+    if (TkTextGetIndex(interp, textPtr, argv[i+1], &index) != TCL_OK) {
+	return TCL_ERROR;
+    }
+    numLines = TkBTreeNumLines(textPtr->tree);
+    startingLine = TkBTreeLineIndex(index.linePtr);
+    startingChar = index.charIndex;
+    if (startingLine >= numLines) {
+	if (backwards) {
+	    startingLine = TkBTreeNumLines(textPtr->tree) - 1;
+	    startingChar = TkBTreeCharsInLine(TkBTreeFindLine(textPtr->tree,
+		    startingLine));
+	} else {
+	    startingLine = 0;
+	    startingChar = 0;
+	}
+    }
+    if (argsLeft == 1) {
+	if (TkTextGetIndex(interp, textPtr, argv[i+2], &stopIndex) != TCL_OK) {
+	    return TCL_ERROR;
+	}
+	stopLine = TkBTreeLineIndex(stopIndex.linePtr);
+	if (!backwards && (stopLine == numLines)) {
+	    stopLine = numLines-1;
+	}
+	searchWholeText = 0;
+    } else {
+	stopLine = 0;
+	searchWholeText = 1;
+    }
+
+    /*
+     * Scan through all of the lines of the text circularly, starting
+     * at the given index.
+     */
+
+    matchLength = patLength = 0;	/* Only needed to prevent compiler
+					 * warnings. */
+    if (exact) {
+	patLength = strlen(pattern);
+    } else {
+	regexp = Tcl_RegExpCompile(interp, pattern);
+	if (regexp == NULL) {
+	    return TCL_ERROR;
+	}
+    }
+    lineNum = startingLine;
+    code = TCL_OK;
+    Tcl_DStringInit(&line);
+    for (passes = 0; passes < 2; ) {
+	if (lineNum >= numLines) {
+	    /*
+	     * Don't search the dummy last line of the text.
+	     */
+
+	    goto nextLine;
+	}
+
+	/*
+	 * Extract the text from the line.  If we're doing regular
+	 * expression matching, drop the newline from the line, so
+	 * that "$" can be used to match the end of the line.
+	 */
+
+	linePtr = TkBTreeFindLine(textPtr->tree, lineNum);
+	for (segPtr = linePtr->segPtr; segPtr != NULL;
+		segPtr = segPtr->nextPtr) {
+	    if (segPtr->typePtr != &tkTextCharType) {
+		continue;
+	    }
+	    Tcl_DStringAppend(&line, segPtr->body.chars, segPtr->size);
+	}
+	if (!exact) {
+	    Tcl_DStringSetLength(&line, Tcl_DStringLength(&line)-1);
+	}
+	startOfLine = Tcl_DStringValue(&line);
+
+	/*
+	 * If we're ignoring case, convert the line to lower case.
+	 */
+
+	if (noCase) {
+	    for (p = Tcl_DStringValue(&line); *p != 0; p++) {
+		if (isupper(UCHAR(*p))) {
+		    *p = tolower(UCHAR(*p));
+		}
+	    }
+	}
+
+	/*
+	 * Check for matches within the current line.  If so, and if we're
+	 * searching backwards, repeat the search to find the last match
+	 * in the line.
+	 */
+
+	matchChar = -1;
+	firstChar = 0;
+	lastChar = INT_MAX;
+	if (lineNum == startingLine) {
+	    int indexInDString;
+
+	    /*
+	     * The starting line is tricky: the first time we see it
+	     * we check one part of the line, and the second pass through
+	     * we check the other part of the line.  We have to be very
+	     * careful here because there could be embedded windows or
+	     * other things that are not in the extracted line.  Rescan
+	     * the original line to compute the index in it of the first
+	     * character.
+	     */
+
+	    indexInDString = startingChar;
+	    for (segPtr = linePtr->segPtr, leftToScan = startingChar;
+		    leftToScan > 0; segPtr = segPtr->nextPtr) {
+		if (segPtr->typePtr != &tkTextCharType) {
+		    indexInDString -= segPtr->size;
+		}
+		leftToScan -= segPtr->size;
+	    }
+
+	    passes++;
+	    if ((passes == 1) ^ backwards) {
+		/*
+		 * Only use the last part of the line.
+		 */
+
+		firstChar = indexInDString;
+		if (firstChar >= Tcl_DStringLength(&line)) {
+		    goto nextLine;
+		}
+	    } else {
+		/*
+		 * Use only the first part of the line.
+		 */
+
+		lastChar = indexInDString;
+	    }
+	}
+	do {
+	    int thisLength;
+	    if (exact) {
+		p = strstr(startOfLine + firstChar, pattern);
+		if (p == NULL) {
+		    break;
+		}
+		i = p - startOfLine;
+		thisLength = patLength;
+	    } else {
+		char *start, *end;
+		int match;
+
+		match = Tcl_RegExpExec(interp, regexp,
+			startOfLine + firstChar, startOfLine);
+		if (match < 0) {
+		    code = TCL_ERROR;
+		    goto done;
+		}
+		if (!match) {
+		    break;
+		}
+		Tcl_RegExpRange(regexp, 0, &start, &end);
+		i = start - startOfLine;
+		thisLength = end - start;
+	    }
+	    if (i >= lastChar) {
+		break;
+	    }
+	    matchChar = i;
+	    matchLength = thisLength;
+	    firstChar = matchChar+1;
+	} while (backwards);
+
+	/*
+	 * If we found a match then we're done.  Make sure that
+	 * the match occurred before the stopping index, if one was
+	 * specified.
+	 */
+
+	if (matchChar >= 0) {
+	    /*
+	     * The index information returned by the regular expression
+	     * parser only considers textual information:  it doesn't
+	     * account for embedded windows or any other non-textual info.
+	     * Scan through the line's segments again to adjust both
+	     * matchChar and matchCount.
+	     */
+
+	    for (segPtr = linePtr->segPtr, leftToScan = matchChar;
+		    leftToScan >= 0; segPtr = segPtr->nextPtr) {
+		if (segPtr->typePtr != &tkTextCharType) {
+		    matchChar += segPtr->size;
+		    continue;
+		}
+		leftToScan -= segPtr->size;
+	    }
+	    for (leftToScan += matchLength; leftToScan > 0;
+		    segPtr = segPtr->nextPtr) {
+		if (segPtr->typePtr != &tkTextCharType) {
+		    matchLength += segPtr->size;
+		    continue;
+		}
+		leftToScan -= segPtr->size;
+	    }
+	    TkTextMakeIndex(textPtr->tree, lineNum, matchChar, &index);
+	    if (!searchWholeText) {
+		if (!backwards && (TkTextIndexCmp(&index, &stopIndex) >= 0)) {
+		    goto done;
+		}
+		if (backwards && (TkTextIndexCmp(&index, &stopIndex) < 0)) {
+		    goto done;
+		}
+	    }
+	    if (varName != NULL) {
+		sprintf(buffer, "%d", matchLength);
+		if (Tcl_SetVar(interp, varName, buffer, TCL_LEAVE_ERR_MSG)
+			== NULL) {
+		    code = TCL_ERROR;
+		    goto done;
+		}
+	    }
+	    TkTextPrintIndex(&index, interp->result);
+	    goto done;
+	}
+
+	/*
+	 * Go to the next (or previous) line;
+	 */
+
+	nextLine:
+	if (backwards) {
+	    lineNum--;
+	    if (!searchWholeText) {
+		if (lineNum < stopLine) {
+		    break;
+		}
+	    } else if (lineNum < 0) {
+		lineNum = numLines-1;
+	    }
+	} else {
+	    lineNum++;
+	    if (!searchWholeText) {
+		if (lineNum > stopLine) {
+		    break;
+		}
+	    } else if (lineNum >= numLines) {
+		lineNum = 0;
+	    }
+	}
+	Tcl_DStringSetLength(&line, 0);
+    }
+    done:
+    Tcl_DStringFree(&line);
+    if (noCase) {
+	Tcl_DStringFree(&patDString);
+    }
+    return code;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkTextGetTabs --
+ *
+ *	Parses a string description of a set of tab stops.
+ *
+ * Results:
+ *	The return value is a pointer to a malloc'ed structure holding
+ *	parsed information about the tab stops.  If an error occurred
+ *	then the return value is NULL and an error message is left in
+ *	interp->result.
+ *
+ * Side effects:
+ *	Memory is allocated for the structure that is returned.  It is
+ *	up to the caller to free this structure when it is no longer
+ *	needed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+TkTextTabArray *
+TkTextGetTabs(interp, tkwin, string)
+    Tcl_Interp *interp;			/* Used for error reporting. */
+    Tk_Window tkwin;			/* Window in which the tabs will be
+					 * used. */
+    char *string;			/* Description of the tab stops.  See
+					 * the text manual entry for details. */
+{
+    int argc, i, count, c;
+    char **argv;
+    TkTextTabArray *tabArrayPtr;
+    TkTextTab *tabPtr;
+
+    if (Tcl_SplitList(interp, string, &argc, &argv) != TCL_OK) {
+	return NULL;
+    }
+
+    /*
+     * First find out how many entries we need to allocate in the
+     * tab array.
+     */
+
+    count = 0;
+    for (i = 0; i < argc; i++) {
+	c = argv[i][0];
+	if ((c != 'l') && (c != 'r') && (c != 'c') && (c != 'n')) {
+	    count++;
+	}
+    }
+
+    /*
+     * Parse the elements of the list one at a time to fill in the
+     * array.
+     */
+
+    tabArrayPtr = (TkTextTabArray *) ckalloc((unsigned)
+	    (sizeof(TkTextTabArray) + (count-1)*sizeof(TkTextTab)));
+    tabArrayPtr->numTabs = 0;
+    for (i = 0, tabPtr = &tabArrayPtr->tabs[0]; i  < argc; i++, tabPtr++) {
+	if (Tk_GetPixels(interp, tkwin, argv[i], &tabPtr->location)
+		!= TCL_OK) {
+	    goto error;
+	}
+	tabArrayPtr->numTabs++;
+
+	/*
+	 * See if there is an explicit alignment in the next list
+	 * element.  Otherwise just use "left".
+	 */
+
+	tabPtr->alignment = LEFT;
+	if ((i+1) == argc) {
+	    continue;
+	}
+	c = UCHAR(argv[i+1][0]);
+	if (!isalpha(c)) {
+	    continue;
+	}
+	i += 1;
+	if ((c == 'l') && (strncmp(argv[i], "left",
+		strlen(argv[i])) == 0)) {
+	    tabPtr->alignment = LEFT;
+	} else if ((c == 'r') && (strncmp(argv[i], "right",
+		strlen(argv[i])) == 0)) {
+	    tabPtr->alignment = RIGHT;
+	} else if ((c == 'c') && (strncmp(argv[i], "center",
+		strlen(argv[i])) == 0)) {
+	    tabPtr->alignment = CENTER;
+	} else if ((c == 'n') && (strncmp(argv[i],
+		"numeric", strlen(argv[i])) == 0)) {
+	    tabPtr->alignment = NUMERIC;
+	} else {
+	    Tcl_AppendResult(interp, "bad tab alignment \"",
+		    argv[i], "\": must be left, right, center, or numeric",
+		    (char *) NULL);
+	    goto error;
+	}
+    }
+    ckfree((char *) argv);
+    return tabArrayPtr;
+
+    error:
+    ckfree((char *) tabArrayPtr);
+    ckfree((char *) argv);
+    return NULL;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TextDumpCmd --
+ *
+ *	Return information about the text, tags, marks, and embedded windows
+ *	and images in a text widget.  See the man page for the description
+ *	of the text dump operation for all the details.
+ *
+ * Results:
+ *	A standard Tcl result.
+ *
+ * Side effects:
+ *	Memory is allocated for the result, if needed (standard Tcl result
+ *	side effects).
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+TextDumpCmd(textPtr, interp, argc, argv)
+    register TkText *textPtr;	/* Information about text widget. */
+    Tcl_Interp *interp;		/* Current interpreter. */
+    int argc;			/* Number of arguments. */
+    char **argv;		/* Argument strings.  Someone else has already
+				 * parsed this command enough to know that
+				 * argv[1] is "dump". */
+{
+    TkTextIndex index1, index2;
+    int arg;
+    int lineno;			/* Current line number */
+    int what = 0;		/* bitfield to select segment types */
+    int atEnd;			/* True if dumping up to logical end */
+    TkTextLine *linePtr;
+    char *command = NULL;	/* Script callback to apply to segments */
+#define TK_DUMP_TEXT	0x1
+#define TK_DUMP_MARK	0x2
+#define TK_DUMP_TAG	0x4
+#define TK_DUMP_WIN	0x8
+#define TK_DUMP_IMG	0x10
+#define TK_DUMP_ALL	(TK_DUMP_TEXT|TK_DUMP_MARK|TK_DUMP_TAG| \
+	TK_DUMP_WIN|TK_DUMP_IMG)
+
+    for (arg=2 ; argv[arg] != (char *) NULL ; arg++) {
+	size_t len;
+	if (argv[arg][0] != '-') {
+	    break;
+	}
+	len = strlen(argv[arg]);
+	if (strncmp("-all", argv[arg], len) == 0) {
+	    what = TK_DUMP_ALL;
+	} else if (strncmp("-text", argv[arg], len) == 0) {
+	    what |= TK_DUMP_TEXT;
+	} else if (strncmp("-tag", argv[arg], len) == 0) {
+	    what |= TK_DUMP_TAG;
+	} else if (strncmp("-mark", argv[arg], len) == 0) {
+	    what |= TK_DUMP_MARK;
+	} else if (strncmp("-image", argv[arg], len) == 0) {
+	    what |= TK_DUMP_IMG;
+	} else if (strncmp("-window", argv[arg], len) == 0) {
+	    what |= TK_DUMP_WIN;
+	} else if (strncmp("-command", argv[arg], len) == 0) {
+	    arg++;
+	    if (arg >= argc) {
+		Tcl_AppendResult(interp, "Usage: ", argv[0], " dump ?-all -image -text -mark -tag -window? ?-command script? index ?index2?", NULL);
+		return TCL_ERROR;
+	    }
+	    command = argv[arg];
+	} else {
+	    Tcl_AppendResult(interp, "Usage: ", argv[0], " dump ?-all -image -text -mark -tag -window? ?-command script? index ?index2?", NULL);
+	    return TCL_ERROR;
+	}
+    }
+    if (arg >= argc) {
+	Tcl_AppendResult(interp, "Usage: ", argv[0], " dump ?-all -image -text -mark -tag -window? ?-command script? index ?index2?", NULL);
+	return TCL_ERROR;
+    }
+    if (what == 0) {
+	what = TK_DUMP_ALL;
+    }
+    if (TkTextGetIndex(interp, textPtr, argv[arg], &index1) != TCL_OK) {
+	return TCL_ERROR;
+    }
+    lineno = TkBTreeLineIndex(index1.linePtr) + 1;
+    arg++;
+    atEnd = 0;
+    if (argc == arg) {
+	TkTextIndexForwChars(&index1, 1, &index2);
+    } else {
+	if (TkTextGetIndex(interp, textPtr, argv[arg], &index2) != TCL_OK) {
+	    return TCL_ERROR;
+	}
+	if (strncmp(argv[arg], "end", strlen(argv[arg])) == 0) {
+	    atEnd = 1;
+	}
+    }
+    if (TkTextIndexCmp(&index1, &index2) >= 0) {
+	return TCL_OK;
+    }
+    if (index1.linePtr == index2.linePtr) {
+	DumpLine(interp, textPtr, what, index1.linePtr,
+	    index1.charIndex, index2.charIndex, lineno, command);
+    } else {
+	DumpLine(interp, textPtr, what, index1.linePtr,
+		index1.charIndex, 32000000, lineno, command);
+	linePtr = index1.linePtr;
+	while ((linePtr = TkBTreeNextLine(linePtr)) != (TkTextLine *)NULL) {
+	    lineno++;
+	    if (linePtr == index2.linePtr) {
+		break;
+	    }
+	    DumpLine(interp, textPtr, what, linePtr, 0, 32000000,
+		    lineno, command);
+	}
+	DumpLine(interp, textPtr, what, index2.linePtr, 0,
+		index2.charIndex, lineno, command);
+    }
+    /*
+     * Special case to get the leftovers hiding at the end mark.
+     */
+    if (atEnd) {
+	DumpLine(interp, textPtr, what & ~TK_DUMP_TEXT, index2.linePtr,
+		0, 1, lineno, command);
+
+    }
+    return TCL_OK;
+}
+
+/*
+ * DumpLine
+ * 	Return information about a given text line from character
+ *	position "start" up to, but not including, "end".
+ *
+ * Results:
+ *	A standard Tcl result.
+ *
+ * Side effects:
+ *	None, but see DumpSegment.
+ */
+static void
+DumpLine(interp, textPtr, what, linePtr, start, end, lineno, command)
+    Tcl_Interp *interp;
+    TkText *textPtr;
+    int what;			/* bit flags to select segment types */
+    TkTextLine *linePtr;	/* The current line */
+    int start, end;		/* Character range to dump */
+    int lineno;			/* Line number for indices dump */
+    char *command;		/* Script to apply to the segment */
+{
+    int offset;
+    TkTextSegment *segPtr;
+    /*
+     * Must loop through line looking at its segments.
+     * character
+     * toggleOn, toggleOff
+     * mark
+     * image
+     * window
+     */
+    for (offset = 0, segPtr = linePtr->segPtr ;
+	    (offset < end) && (segPtr != (TkTextSegment *)NULL) ;
+	    offset += segPtr->size, segPtr = segPtr->nextPtr) {
+	if ((what & TK_DUMP_TEXT) && (segPtr->typePtr == &tkTextCharType) &&
+		(offset + segPtr->size > start)) {
+	    char savedChar;			/* Last char used in the seg */
+	    int last = segPtr->size;		/* Index of savedChar */
+	    int first = 0;			/* Index of first char in seg */
+	    if (offset + segPtr->size > end) {
+		last = end - offset;
+	    }
+	    if (start > offset) {
+		first = start - offset;
+	    }
+	    savedChar = segPtr->body.chars[last];
+	    segPtr->body.chars[last] = '\0';
+	    DumpSegment(interp, "text", segPtr->body.chars + first,
+		    command, lineno, offset + first, what);
+	    segPtr->body.chars[last] = savedChar;
+	} else if ((offset >= start)) {
+	    if ((what & TK_DUMP_MARK) && (segPtr->typePtr->name[0] == 'm')) {
+		TkTextMark *markPtr = (TkTextMark *)&segPtr->body;
+		char *name = Tcl_GetHashKey(&textPtr->markTable, markPtr->hPtr);
+		DumpSegment(interp, "mark", name,
+			command, lineno, offset, what);
+	    } else if ((what & TK_DUMP_TAG) &&
+			(segPtr->typePtr == &tkTextToggleOnType)) {
+		DumpSegment(interp, "tagon",
+			segPtr->body.toggle.tagPtr->name,
+			command, lineno, offset, what);
+	    } else if ((what & TK_DUMP_TAG) && 
+			(segPtr->typePtr == &tkTextToggleOffType)) {
+		DumpSegment(interp, "tagoff",
+			segPtr->body.toggle.tagPtr->name,
+			command, lineno, offset, what);
+	    } else if ((what & TK_DUMP_IMG) && 
+			(segPtr->typePtr->name[0] == 'i')) {
+		TkTextEmbImage *eiPtr = (TkTextEmbImage *)&segPtr->body;
+		char *name = (eiPtr->name ==  NULL) ? "" : eiPtr->name;
+		DumpSegment(interp, "image", name,
+			command, lineno, offset, what);
+	    } else if ((what & TK_DUMP_WIN) && 
+			(segPtr->typePtr->name[0] == 'w')) {
+		TkTextEmbWindow *ewPtr = (TkTextEmbWindow *)&segPtr->body;
+		char *pathname;
+		if (ewPtr->tkwin == (Tk_Window) NULL) {
+		    pathname = "";
+		} else {
+		    pathname = Tk_PathName(ewPtr->tkwin);
+		}
+		DumpSegment(interp, "window", pathname,
+			command, lineno, offset, what);
+	    }
+	}
+    }
+}
+
+/*
+ * DumpSegment
+ *	Either append information about the current segment to the result,
+ *	or make a script callback with that information as arguments.
+ *
+ * Results:
+ *	None
+ *
+ * Side effects:
+ *	Either evals the callback or appends elements to the result string.
+ */
+static int
+DumpSegment(interp, key, value, command, lineno, offset, what)
+    Tcl_Interp *interp;
+    char *key;			/* Segment type key */
+    char *value;		/* Segment value */
+    char *command;		/* Script callback */
+    int lineno;			/* Line number for indices dump */
+    int offset;			/* Character position */
+    int what;			/* Look for TK_DUMP_INDEX bit */
+{
+    char buffer[30];
+    sprintf(buffer, "%d.%d", lineno, offset);
+    if (command == (char *) NULL) {
+	Tcl_AppendElement(interp, key);
+	Tcl_AppendElement(interp, value);
+	Tcl_AppendElement(interp, buffer);
+	return TCL_OK;
+    } else {
+	char *argv[4];
+	char *list;
+	int result;
+	argv[0] = key;
+	argv[1] = value;
+	argv[2] = buffer;
+	argv[3] = (char *) NULL;
+	list = Tcl_Merge(3, argv);
+	result = Tcl_VarEval(interp, command, " ", list, (char *) NULL);
+	ckfree(list);
+	return result;
+    }
+}
+