/*
 * tclTrace.c --
 *
 *	This file contains code to handle most trace management.
 *
 * Copyright (c) 1987-1993 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 1998-2000 Scriptics Corporation.
 * Copyright (c) 2002 ActiveState Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclTrace.c,v 1.57 2009/10/21 13:36:23 dkf Exp $
 * RCS: @(#) $Id: tclTrace.c,v 1.58 2010/02/24 10:45:04 dkf Exp $
 */

#include "tclInt.h"

/*
 * Structures used to hold information about variable traces:
 */

    int optionIndex,		/* Add, info or remove */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    int commandLength, index;
    const char *name, *command;
    size_t length;
    ClientData clientData;
    enum traceOptions { TRACE_ADD, TRACE_INFO, TRACE_REMOVE };
    static const char *const opStrings[] = {
	"array", "read", "unset", "write", NULL
    };
    enum operations {
	TRACE_VAR_ARRAY, TRACE_VAR_READ, TRACE_VAR_UNSET, TRACE_VAR_WRITE
    };

	}
	command = Tcl_GetStringFromObj(objv[5], &commandLength);
	length = (size_t) commandLength;
	if ((enum traceOptions) optionIndex == TRACE_ADD) {
	    CombinedTraceVarInfo *ctvarPtr = (CombinedTraceVarInfo *)
		    ckalloc((unsigned) (sizeof(CombinedTraceVarInfo)
		    + length + 1 - sizeof(ctvarPtr->traceCmdInfo.command)));

	    ctvarPtr->traceCmdInfo.flags = flags;
	    if (objv[0] == NULL) {
		ctvarPtr->traceCmdInfo.flags |= TCL_TRACE_OLD_STYLE;
	    }
	    ctvarPtr->traceCmdInfo.length = length;
	    flags |= TCL_TRACE_UNSETS | TCL_TRACE_RESULT_OBJECT;
	    strcpy(ctvarPtr->traceCmdInfo.command, command);

	} else {
	    /*
	     * Search through all of our traces on this variable to see if
	     * there's one with the given command. If so, then delete the
	     * first one that matches.
	     */

	    ClientData clientData;

	    name = Tcl_GetString(objv[3]);
	    FOREACH_VAR_TRACE(interp, name, clientData) {
		TraceVarInfo *tvarPtr = clientData;

		if ((tvarPtr->length == length)
			&& ((tvarPtr->flags & ~TCL_TRACE_OLD_STYLE)==flags)
			&& (strncmp(command, tvarPtr->command,
				(size_t) length) == 0)) {
		    Tcl_UntraceVar2(interp, name, NULL,
			    flags | TCL_TRACE_UNSETS | TCL_TRACE_RESULT_OBJECT,
			    TraceVarProc, clientData);
		    break;
		}
	    }
	}
	break;
    }
    case TRACE_INFO: {
	ClientData clientData;
	Tcl_Obj *resultListPtr;

	if (objc != 4) {
	    Tcl_WrongNumArgs(interp, 3, objv, "name");
	    return TCL_ERROR;
	}