tclHistory.c Go to the documentation of this file. /* * tclHistory.c -- * * This module and the Tcl library file history.tcl together implement * Tcl command history. Tcl_RecordAndEval(Obj) can be called to record * commands ("events") before they are executed. Commands defined in * history.tcl may be used to perform history substitutions. * * Copyright (c) 1990-1993 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: tclHistory.c,v 1.10 2007/04/10 14:47:15 dkf Exp $ */ #include "tclInt.h"  /* *---------------------------------------------------------------------- * * Tcl_RecordAndEval -- * * This procedure adds its command argument to the current list of * recorded events and then executes the command by calling Tcl_Eval. * * Results: * The return value is a standard Tcl return value, the result of * executing cmd. * * Side effects: * The command is recorded and executed. * *---------------------------------------------------------------------- */ int Tcl_RecordAndEval( Tcl_Interp *interp, /* Token for interpreter in which command will * be executed. */ CONST char *cmd, /* Command to record. */ int flags) /* Additional flags. TCL_NO_EVAL means only * record: don't execute command. * TCL_EVAL_GLOBAL means use Tcl_GlobalEval * instead of Tcl_Eval. */ { register Tcl_Obj *cmdPtr; int length = strlen(cmd); int result; if (length > 0) { /* * Call Tcl_RecordAndEvalObj to do the actual work. */ cmdPtr = Tcl_NewStringObj(cmd, length); Tcl_IncrRefCount(cmdPtr); result = Tcl_RecordAndEvalObj(interp, cmdPtr, flags); /* * Move the interpreter's object result to the string result, then * reset the object result. */ (void) Tcl_GetStringResult(interp); /* * Discard the Tcl object created to hold the command. */ Tcl_DecrRefCount(cmdPtr); } else { /* * An empty string. Just reset the interpreter's result. */ Tcl_ResetResult(interp); result = TCL_OK; } return result; }  /* *---------------------------------------------------------------------- * * Tcl_RecordAndEvalObj -- * * This procedure adds the command held in its argument object to the * current list of recorded events and then executes the command by * calling Tcl_EvalObj. * * Results: * The return value is a standard Tcl return value, the result of * executing the command. * * Side effects: * The command is recorded and executed. * *---------------------------------------------------------------------- */ int Tcl_RecordAndEvalObj( Tcl_Interp *interp, /* Token for interpreter in which command will * be executed. */ Tcl_Obj *cmdPtr, /* Points to object holding the command to * record and execute. */ int flags) /* Additional flags. TCL_NO_EVAL means record * only: don't execute the command. * TCL_EVAL_GLOBAL means evaluate the script * in global variable context instead of the * current procedure. */ { int result, call = 1; Tcl_Obj *list[3]; register Tcl_Obj *objPtr; Tcl_CmdInfo info; /* * Do not call [history] if it has been replaced by an empty proc */ result = Tcl_GetCommandInfo(interp, "history", &info); if (result && (info.objProc == TclObjInterpProc)) { Proc *procPtr = (Proc *)(info.objClientData); call = (procPtr->cmdPtr->compileProc != TclCompileNoOp); } if (call) { /* * Do recording by eval'ing a tcl history command: history add $cmd. */ TclNewLiteralStringObj(list[0], "history"); TclNewLiteralStringObj(list[1], "add"); list[2] = cmdPtr; objPtr = Tcl_NewListObj(3, list); Tcl_IncrRefCount(objPtr); (void) Tcl_EvalObjEx(interp, objPtr, TCL_EVAL_GLOBAL); Tcl_DecrRefCount(objPtr); /* * One possible failure mode above: exceeding a resource limit. */ if (Tcl_LimitExceeded(interp)) { return TCL_ERROR; } } /* * Execute the command. */ result = TCL_OK; if (!(flags & TCL_NO_EVAL)) { result = Tcl_EvalObjEx(interp, cmdPtr, flags & TCL_EVAL_GLOBAL); } return result; }  /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */

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