tkconsole.c

linux系统下的音频通信

/* 
 * tkConsole.c --
 *
 *	This file implements a Tcl console for systems that may not
 *	otherwise have access to a console.  It uses the Text widget
 *	and provides special access via a console command.
 *
 * Copyright (c) 1995-1996 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: @(#) tkConsole.c 1.54 97/10/17 10:46:08
 */

#include "tk.h"
#include <string.h>

/*
 * A data structure of the following type holds information for each console
 * which a handler (i.e. a Tcl command) has been defined for a particular
 * top-level window.
 */

typedef struct ConsoleInfo {
    Tcl_Interp *consoleInterp;	/* Interpreter for the console. */
    Tcl_Interp *interp;		/* Interpreter to send console commands. */
} ConsoleInfo;

static Tcl_Interp *gStdoutInterp = NULL;

/*
 * Forward declarations for procedures defined later in this file:
 *
 * The first three will be used in the tk app shells...
 */
 
void	TkConsoleCreate _ANSI_ARGS_((void));
int	TkConsoleInit _ANSI_ARGS_((Tcl_Interp *interp));
void	TkConsolePrint _ANSI_ARGS_((Tcl_Interp *interp,
			    int devId, char *buffer, long size));

static int	ConsoleCmd _ANSI_ARGS_((ClientData clientData,
		    Tcl_Interp *interp, int argc, char **argv));
static void	ConsoleDeleteProc _ANSI_ARGS_((ClientData clientData));
static void	ConsoleEventProc _ANSI_ARGS_((ClientData clientData,
		    XEvent *eventPtr));
static int	InterpreterCmd _ANSI_ARGS_((ClientData clientData,
		    Tcl_Interp *interp, int argc, char **argv));

static int	ConsoleInput _ANSI_ARGS_((ClientData instanceData,
		    char *buf, int toRead, int *errorCode));
static int	ConsoleOutput _ANSI_ARGS_((ClientData instanceData,
		    char *buf, int toWrite, int *errorCode));
static int	ConsoleClose _ANSI_ARGS_((ClientData instanceData,
		    Tcl_Interp *interp));
static void	ConsoleWatch _ANSI_ARGS_((ClientData instanceData,
		    int mask));
static int	ConsoleHandle _ANSI_ARGS_((ClientData instanceData,
		    int direction, ClientData *handlePtr));

/*
 * This structure describes the channel type structure for file based IO:
 */

static Tcl_ChannelType consoleChannelType = {
    "console",			/* Type name. */
    NULL,			/* Always non-blocking.*/
    ConsoleClose,		/* Close proc. */
    ConsoleInput,		/* Input proc. */
    ConsoleOutput,		/* Output proc. */
    NULL,			/* Seek proc. */
    NULL,			/* Set option proc. */
    NULL,			/* Get option proc. */
    ConsoleWatch,		/* Watch for events on console. */
    ConsoleHandle,		/* Get a handle from the device. */
};

/*
 *----------------------------------------------------------------------
 *
 * TkConsoleCreate --
 *
 * 	Create the console channels and install them as the standard
 * 	channels.  All I/O will be discarded until TkConsoleInit is
 * 	called to attach the console to a text widget.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates the console channel and installs it as the standard
 *	channels.
 *
 *----------------------------------------------------------------------
 */

void
TkConsoleCreate()
{
    Tcl_Channel consoleChannel;

    consoleChannel = Tcl_CreateChannel(&consoleChannelType, "console0",
	    (ClientData) TCL_STDIN, TCL_READABLE);
    if (consoleChannel != NULL) {
	Tcl_SetChannelOption(NULL, consoleChannel, "-translation", "lf");
	Tcl_SetChannelOption(NULL, consoleChannel, "-buffering", "none");
    }
    Tcl_SetStdChannel(consoleChannel, TCL_STDIN);
    consoleChannel = Tcl_CreateChannel(&consoleChannelType, "console1",
	    (ClientData) TCL_STDOUT, TCL_WRITABLE);
    if (consoleChannel != NULL) {
	Tcl_SetChannelOption(NULL, consoleChannel, "-translation", "lf");
	Tcl_SetChannelOption(NULL, consoleChannel, "-buffering", "none");
    }
    Tcl_SetStdChannel(consoleChannel, TCL_STDOUT);
    consoleChannel = Tcl_CreateChannel(&consoleChannelType, "console2",
	    (ClientData) TCL_STDERR, TCL_WRITABLE);
    if (consoleChannel != NULL) {
	Tcl_SetChannelOption(NULL, consoleChannel, "-translation", "lf");
	Tcl_SetChannelOption(NULL, consoleChannel, "-buffering", "none");
    }
    Tcl_SetStdChannel(consoleChannel, TCL_STDERR);
}

/*
 *----------------------------------------------------------------------
 *
 * TkConsoleInit --
 *
 *	Initialize the console.  This code actually creates a new
 *	application and associated interpreter.  This effectivly hides
 *	the implementation from the main application.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	A new console it created.
 *
 *----------------------------------------------------------------------
 */

int 
TkConsoleInit(interp)
    Tcl_Interp *interp;			/* Interpreter to use for prompting. */
{
    Tcl_Interp *consoleInterp;
    ConsoleInfo *info;
    Tk_Window mainWindow = Tk_MainWindow(interp);
#ifdef MAC_TCL
    static char initCmd[] = "source -rsrc {Console}";
#else
    static char initCmd[] = "source $tk_library/console.tcl";
#endif
    
    consoleInterp = Tcl_CreateInterp();
    if (consoleInterp == NULL) {
	goto error;
    }
    
    /*
     * Initialized Tcl and Tk.
     */

    if (Tcl_Init(consoleInterp) != TCL_OK) {
	goto error;
    }
    if (Tk_Init(consoleInterp) != TCL_OK) {
	goto error;
    }
    gStdoutInterp = interp;
    
    /* 
     * Add console commands to the interp 
     */
    info = (ConsoleInfo *) ckalloc(sizeof(ConsoleInfo));
    info->interp = interp;
    info->consoleInterp = consoleInterp;
    Tcl_CreateCommand(interp, "console", ConsoleCmd, (ClientData) info,
	    (Tcl_CmdDeleteProc *) ConsoleDeleteProc);
    Tcl_CreateCommand(consoleInterp, "consoleinterp", InterpreterCmd,
	    (ClientData) info, (Tcl_CmdDeleteProc *) NULL);

    Tk_CreateEventHandler(mainWindow, StructureNotifyMask, ConsoleEventProc,
	    (ClientData) info);

    Tcl_Preserve((ClientData) consoleInterp);
    if (Tcl_Eval(consoleInterp, initCmd) == TCL_ERROR) {
	/* goto error; -- no problem for now... */
	printf("Eval error: %s", consoleInterp->result);
    }
    Tcl_Release((ClientData) consoleInterp);
    return TCL_OK;
    
    error:
    if (consoleInterp != NULL) {
    	Tcl_DeleteInterp(consoleInterp);
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * ConsoleOutput--
 *
 *	Writes the given output on the IO channel. Returns count of how
 *	many characters were actually written, and an error indication.
 *
 * Results:
 *	A count of how many characters were written is returned and an
 *	error indication is returned in an output argument.
 *
 * Side effects:
 *	Writes output on the actual channel.
 *
 *----------------------------------------------------------------------
 */

static int
ConsoleOutput(instanceData, buf, toWrite, errorCode)
    ClientData instanceData;		/* Indicates which device to use. */
    char *buf;				/* The data buffer. */
    int toWrite;			/* How many bytes to write? */
    int *errorCode;			/* Where to store error code. */
{
    *errorCode = 0;
    Tcl_SetErrno(0);

    if (gStdoutInterp != NULL) {
	TkConsolePrint(gStdoutInterp, (int) instanceData, buf, toWrite);
    }
    
    return toWrite;
}

/*
 *----------------------------------------------------------------------
 *
 * ConsoleInput --
 *
 *	Read input from the console.  Not currently implemented.
 *
 * Results:
 *	Always returns EOF.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
static int
ConsoleInput(instanceData, buf, bufSize, errorCode)
    ClientData instanceData;		/* Unused. */
    char *buf;				/* Where to store data read. */
    int bufSize;			/* How much space is available
                                         * in the buffer? */
    int *errorCode;			/* Where to store error code. */
{
    return 0;			/* Always return EOF. */
}

/*
 *----------------------------------------------------------------------
 *
 * ConsoleClose --
 *
 *	Closes the IO channel.
 *
 * Results:
 *	Always returns 0 (success).
 *
 * Side effects:
 *	Frees the dummy file associated with the channel.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
static int
ConsoleClose(instanceData, interp)
    ClientData instanceData;	/* Unused. */
    Tcl_Interp *interp;		/* Unused. */
{
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * ConsoleWatch --
 *
 *	Called by the notifier to set up the console device so that
 *	events will be noticed. Since there are no events on the
 *	console, this routine just returns without doing anything.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */