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tclIOCmd.c

/* 
 * tclIOCmd.c --
 *
 *    Contains the definitions of most of the Tcl commands relating to IO.
 *
 * 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.
 *
 * RCS: @(#) $Id: tclIOCmd.c,v 1.3 1998/09/14 18:39:59 stanton Exp $
 */

#include    "tclInt.h"
#include    "tclPort.h"

/*
 * Return at most this number of bytes in one call to Tcl_Read:
 */

#define     TCL_READ_CHUNK_SIZE     4096

/*
 * Callback structure for accept callback in a TCP server.
 */

typedef struct AcceptCallback {
    char *script;             /* Script to invoke. */
    Tcl_Interp *interp;             /* Interpreter in which to run it. */
} AcceptCallback;

/*
 * Static functions for this file:
 */

static void AcceptCallbackProc _ANSI_ARGS_((ClientData callbackData,
                  Tcl_Channel chan, char *address, int port));
static void RegisterTcpServerInterpCleanup _ANSI_ARGS_((Tcl_Interp *interp,
                  AcceptCallback *acceptCallbackPtr));
static void TcpAcceptCallbacksDeleteProc _ANSI_ARGS_((
                ClientData clientData, Tcl_Interp *interp));
static void TcpServerCloseProc _ANSI_ARGS_((ClientData callbackData));
static void UnregisterTcpServerInterpCleanupProc _ANSI_ARGS_((
                Tcl_Interp *interp, AcceptCallback *acceptCallbackPtr));

/*
 *----------------------------------------------------------------------
 *
 * Tcl_PutsObjCmd --
 *
 *    This procedure is invoked to process the "puts" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    Produces output on a channel.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_PutsObjCmd(dummy, interp, objc, objv)
    ClientData dummy;         /* Not used. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tcl_Channel chan;               /* The channel to puts on. */
    int i;                    /* Counter. */
    int newline;              /* Add a newline at end? */
    char *channelId;                /* Name of channel for puts. */
    int result;                     /* Result of puts operation. */
    int mode;                       /* Mode in which channel is opened. */
    char *arg;
    int length;
    Tcl_Obj *resultPtr;

    i = 1;
    newline = 1;
    if ((objc >= 2) && (strcmp(Tcl_GetStringFromObj(objv[1], NULL),
          "-nonewline") == 0)) {
      newline = 0;
      i++;
    }
    if ((i < (objc-3)) || (i >= objc)) {
      Tcl_WrongNumArgs(interp, 1, objv, "?-nonewline? ?channelId? string");
      return TCL_ERROR;
    }

    /*
     * The code below provides backwards compatibility with an old
     * form of the command that is no longer recommended or documented.
     */

    resultPtr = Tcl_NewObj();
    if (i == (objc-3)) {
      arg = Tcl_GetStringFromObj(objv[i+2], &length);
      if (strncmp(arg, "nonewline", (size_t) length) != 0) {
          Tcl_AppendStringsToObj(resultPtr, "bad argument \"", arg,
                "\": should be \"nonewline\"", (char *) NULL);
            Tcl_SetObjResult(interp, resultPtr);
          return TCL_ERROR;
      }
      newline = 0;
    }
    if (i == (objc-1)) {
      channelId = "stdout";
    } else {
      channelId = Tcl_GetStringFromObj(objv[i], NULL);
      i++;
    }
    chan = Tcl_GetChannel(interp, channelId, &mode);
    if (chan == (Tcl_Channel) NULL) {
        Tcl_DecrRefCount(resultPtr);
        return TCL_ERROR;
    }
    if ((mode & TCL_WRITABLE) == 0) {
      Tcl_AppendStringsToObj(resultPtr, "channel \"", channelId,
                "\" wasn't opened for writing", (char *) NULL);
        Tcl_SetObjResult(interp, resultPtr);
        return TCL_ERROR;
    }

    arg = Tcl_GetStringFromObj(objv[i], &length);
    result = Tcl_Write(chan, arg, length);
    if (result < 0) {
        goto error;
    }
    if (newline != 0) {
        result = Tcl_Write(chan, "\n", 1);
        if (result < 0) {
            goto error;
        }
    }
    Tcl_SetObjResult(interp, resultPtr);
    return TCL_OK;
error:
    Tcl_AppendStringsToObj(resultPtr, "error writing \"",
          Tcl_GetChannelName(chan), "\": ", Tcl_PosixError(interp),
          (char *) NULL);
    Tcl_SetObjResult(interp, resultPtr);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FlushObjCmd --
 *
 *    This procedure is called to process the Tcl "flush" command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    May cause output to appear on the specified channel.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_FlushObjCmd(dummy, interp, objc, objv)
    ClientData dummy;         /* Not used. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tcl_Channel chan;               /* The channel to flush on. */
    char *arg;
    Tcl_Obj *resultPtr;
    int mode;

    if (objc != 2) {
      Tcl_WrongNumArgs(interp, 1, objv, "channelId");
      return TCL_ERROR;
    }
    arg = Tcl_GetStringFromObj(objv[1], NULL);
    chan = Tcl_GetChannel(interp, arg, &mode);
    if (chan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }
    resultPtr = Tcl_GetObjResult(interp);
    if ((mode & TCL_WRITABLE) == 0) {
      Tcl_AppendStringsToObj(resultPtr, "channel \"",
            Tcl_GetStringFromObj(objv[1], NULL), 
                "\" wasn't opened for writing", (char *) NULL);
        return TCL_ERROR;
    }
    
    if (Tcl_Flush(chan) != TCL_OK) {
      Tcl_AppendStringsToObj(resultPtr, "error flushing \"",
            Tcl_GetChannelName(chan), "\": ", Tcl_PosixError(interp),
            (char *) NULL);
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetsObjCmd --
 *
 *    This procedure is called to process the Tcl "gets" command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    May consume input from channel.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_GetsObjCmd(dummy, interp, objc, objv)
    ClientData dummy;         /* Not used. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tcl_Channel chan;               /* The channel to read from. */
    int lineLen;              /* Length of line just read. */
    int mode;                       /* Mode in which channel is opened. */
    char *arg;
    Tcl_Obj *resultPtr, *objPtr;

    if ((objc != 2) && (objc != 3)) {
      Tcl_WrongNumArgs(interp, 1, objv, "channelId ?varName?");
      return TCL_ERROR;
    }
    arg = Tcl_GetStringFromObj(objv[1], NULL);
    chan = Tcl_GetChannel(interp, arg, &mode);
    if (chan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }
    resultPtr = Tcl_NewObj();
    if ((mode & TCL_READABLE) == 0) {
      Tcl_AppendStringsToObj(resultPtr, "channel \"", arg,
                "\" wasn't opened for reading", (char *) NULL);
        Tcl_SetObjResult(interp, resultPtr);
        return TCL_ERROR;
    }

    lineLen = Tcl_GetsObj(chan, resultPtr);
    if (lineLen < 0) {
        if (!Tcl_Eof(chan) && !Tcl_InputBlocked(chan)) {
          Tcl_SetObjLength(resultPtr, 0);
          Tcl_AppendStringsToObj(resultPtr, "error reading \"",
                Tcl_GetChannelName(chan), "\": ", Tcl_PosixError(interp),
                (char *) NULL);
            Tcl_SetObjResult(interp, resultPtr);
            return TCL_ERROR;
        }
        lineLen = -1;
    }
    if (objc == 3) {
      Tcl_ResetResult(interp);
      objPtr = Tcl_ObjSetVar2(interp, objv[2], NULL,
            resultPtr, TCL_LEAVE_ERR_MSG | TCL_PARSE_PART1);
      if (objPtr == NULL) {
            Tcl_DecrRefCount(resultPtr);
            return TCL_ERROR;
        }
        Tcl_ResetResult(interp);
      Tcl_SetIntObj(Tcl_GetObjResult(interp), lineLen);
        return TCL_OK;
    }
    Tcl_SetObjResult(interp, resultPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ReadObjCmd --
 *
 *    This procedure is invoked to process the Tcl "read" command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    May consume input from channel.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_ReadObjCmd(dummy, interp, objc, objv)
    ClientData dummy;         /* Not used. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tcl_Channel chan;               /* The channel to read from. */
    int newline, i;                 /* Discard newline at end? */
    int toRead;                     /* How many bytes to read? */
    int toReadNow;                  /* How many bytes to attempt to
                                         * read in the current iteration? */
    int charactersRead;             /* How many characters were read? */
    int charactersReadNow;          /* How many characters were read
                                         * in this iteration? */
    int mode;                       /* Mode in which channel is opened. */
    int bufSize;              /* Channel buffer size; used to decide
                                         * in what chunk sizes to read from
                                         * the channel. */
    char *arg;
    Tcl_Obj *resultPtr;

    if ((objc != 2) && (objc != 3)) {
argerror:
      Tcl_WrongNumArgs(interp, 1, objv, "channelId ?numBytes?");
      Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), " or \"",
            Tcl_GetStringFromObj(objv[0], NULL),
            " ?-nonewline? channelId\"", (char *) NULL);
      return TCL_ERROR;
    }
    i = 1;
    newline = 0;
    if (strcmp(Tcl_GetStringFromObj(objv[1], NULL), "-nonewline") == 0) {
      newline = 1;
      i++;
    }

    if (i == objc) {
        goto argerror;
    }

    arg =  Tcl_GetStringFromObj(objv[i], NULL);
    chan = Tcl_GetChannel(interp, arg, &mode);
    if (chan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }
    if ((mode & TCL_READABLE) == 0) {
      resultPtr = Tcl_GetObjResult(interp);
      Tcl_AppendStringsToObj(resultPtr, "channel \"", arg,
                "\" wasn't opened for reading", (char *) NULL);
        return TCL_ERROR;
    }
    
    i++;    /* Consumed channel name. */

    /*
     * Compute how many bytes to read, and see whether the final
     * newline should be dropped.
     */

    toRead = INT_MAX;
    if (i < objc) {
      arg = Tcl_GetStringFromObj(objv[i], NULL);
      if (isdigit((unsigned char) (arg[0]))) {
          if (Tcl_GetIntFromObj(interp, objv[i], &toRead) != TCL_OK) {
                return TCL_ERROR;
          }
          Tcl_ResetResult(interp);
      } else if (strcmp(arg, "nonewline") == 0) {
          newline = 1;
      } else {
          resultPtr = Tcl_GetObjResult(interp);
          Tcl_AppendStringsToObj(resultPtr, "bad argument \"", arg,
                "\": should be \"nonewline\"", (char *) NULL);
          return TCL_ERROR;
        }
    }

    /*
     * Create a new object and use that instead of the interpreter
     * result. We cannot use the interpreter's result object because
     * it may get smashed at any time by recursive calls.
     */
    
    resultPtr = Tcl_NewObj();
    
    bufSize = Tcl_GetChannelBufferSize(chan);

    /*
     * If the caller specified a maximum length to read, then that is
     * a good size to preallocate.
     */
    
    if ((toRead != INT_MAX) && (toRead > bufSize)) {
        Tcl_SetObjLength(resultPtr, toRead);
    }
    
    for (charactersRead = 0; charactersRead < toRead; ) {
        toReadNow = toRead - charactersRead;
        if (toReadNow > bufSize) {
            toReadNow = bufSize;
        }

        /*
         * NOTE: This is a NOOP if we set the size (above) to the
         * number of bytes we expect to read. In the degenerate
         * case, however, it will grow the buffer by the channel
         * buffersize, which is 4K in most cases. This will result
         * in inefficient copying for large files. This will be
         * fixed in a future release.
         */
        
      Tcl_SetObjLength(resultPtr, charactersRead + toReadNow);
        charactersReadNow =
            Tcl_Read(chan, Tcl_GetStringFromObj(resultPtr, NULL)
                + charactersRead, toReadNow);
        if (charactersReadNow < 0) {
          Tcl_SetObjLength(resultPtr, 0);
            Tcl_AppendStringsToObj(resultPtr, "error reading \"",
                Tcl_GetChannelName(chan), "\": ",
                Tcl_PosixError(interp), (char *) NULL);
            Tcl_SetObjResult(interp, resultPtr);

            return TCL_ERROR;
        }

        /*
         * If we had a short read it means that we have either EOF
         * or BLOCKED on the channel, so break out.
         */
        
        charactersRead += charactersReadNow;

        /*
         * Do not call the driver again if we got a short read
         */
        
        if (charactersReadNow < toReadNow) {
            break;      /* Out of "for" loop. */
        }
    }
    
    /*
     * If requested, remove the last newline in the channel if at EOF.
     */
    
    if ((charactersRead > 0) && (newline) &&
          (Tcl_GetStringFromObj(resultPtr, NULL)[charactersRead-1] == '\n')) {
      charactersRead--;
    }
    Tcl_SetObjLength(resultPtr, charactersRead);

    /*
     * Now set the object into the interpreter result and release our
     * hold on it by decrrefing it.
     */

    Tcl_SetObjResult(interp, resultPtr);
    
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SeekCmd --
 *
 *    This procedure is invoked to process the Tcl "seek" command. See
 *    the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    Moves the position of the access point on the specified channel.
 *    May flush queued output.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_SeekCmd(clientData, interp, argc, argv)
    ClientData clientData;          /* Not used. */
    Tcl_Interp *interp;             /* Current interpreter. */
    int argc;                       /* Number of arguments. */
    char **argv;              /* Argument strings. */
{
    Tcl_Channel chan;               /* The channel to tell on. */
    int offset, mode;               /* Where to seek? */
    int result;                     /* Of calling Tcl_Seek. */

    if ((argc != 3) && (argc != 4)) {
      Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
            " channelId offset ?origin?\"", (char *) NULL);
      return TCL_ERROR;
    }
    chan = Tcl_GetChannel(interp, argv[1], NULL);
    if (chan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }
    if (Tcl_GetInt(interp, argv[2], &offset) != TCL_OK) {
      return TCL_ERROR;
    }
    mode = SEEK_SET;
    if (argc == 4) {
      size_t length;
      int c;

      length = strlen(argv[3]);
      c = argv[3][0];
      if ((c == 's') && (strncmp(argv[3], "start", length) == 0)) {
          mode = SEEK_SET;
      } else if ((c == 'c') && (strncmp(argv[3], "current", length) == 0)) {
          mode = SEEK_CUR;
      } else if ((c == 'e') && (strncmp(argv[3], "end", length) == 0)) {
          mode = SEEK_END;
      } else {
          Tcl_AppendResult(interp, "bad origin \"", argv[3],
                "\": should be start, current, or end", (char *) NULL);
          return TCL_ERROR;
      }
    }

    result = Tcl_Seek(chan, offset, mode);
    if (result == -1) {
        Tcl_AppendResult(interp, "error during seek on \"", 
            Tcl_GetChannelName(chan), "\": ",
                Tcl_PosixError(interp), (char *) NULL);
        return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_TellCmd --
 *
 *    This procedure is invoked to process the Tcl "tell" command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_TellCmd(clientData, interp, argc, argv)
    ClientData clientData;          /* Not used. */
    Tcl_Interp *interp;             /* Current interpreter. */
    int argc;                       /* Number of arguments. */
    char **argv;              /* Argument strings. */
{
    Tcl_Channel chan;               /* The channel to tell on. */
    char buf[40];

    if (argc != 2) {
      Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
            " channelId\"", (char *) NULL);
      return TCL_ERROR;
    }
    /*
     * Try to find a channel with the right name and permissions in
     * the IO channel table of this interpreter.
     */
    
    chan = Tcl_GetChannel(interp, argv[1], NULL);
    if (chan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }
    TclFormatInt(buf, Tcl_Tell(chan));
    Tcl_SetResult(interp, buf, TCL_VOLATILE);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CloseObjCmd --
 *
 *    This procedure is invoked to process the Tcl "close" command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    May discard queued input; may flush queued output.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_CloseObjCmd(clientData, interp, objc, objv)
    ClientData clientData;    /* Not used. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tcl_Channel chan;               /* The channel to close. */
    int len;                        /* Length of error output. */
    char *arg;

    if (objc != 2) {
      Tcl_WrongNumArgs(interp, 1, objv, "channelId");
      return TCL_ERROR;
    }

    arg = Tcl_GetStringFromObj(objv[1], NULL);
    chan = Tcl_GetChannel(interp, arg, NULL);
    if (chan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }

    if (Tcl_UnregisterChannel(interp, chan) != TCL_OK) {
        /*
         * If there is an error message and it ends with a newline, remove
         * the newline. This is done for command pipeline channels where the
         * error output from the subprocesses is stored in interp->result.
         *
         * NOTE: This is likely to not have any effect on regular error
         * messages produced by drivers during the closing of a channel,
         * because the Tcl convention is that such error messages do not
         * have a terminating newline.
         */

        len = strlen(interp->result);
        if ((len > 0) && (interp->result[len - 1] == '\n')) {
            interp->result[len - 1] = '\0';
        }
        
        return TCL_ERROR;
    }

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FconfigureCmd --
 *
 *    This procedure is invoked to process the Tcl "fconfigure" command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    May modify the behavior of an IO channel.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_FconfigureCmd(clientData, interp, argc, argv)
    ClientData clientData;          /* Not used. */
    Tcl_Interp *interp;             /* Current interpreter. */
    int argc;                       /* Number of arguments. */
    char **argv;              /* Argument strings. */
{
    Tcl_Channel chan;               /* The channel to set a mode on. */
    int i;                    /* Iterate over arg-value pairs. */
    Tcl_DString ds;                 /* DString to hold result of
                                         * calling Tcl_GetChannelOption. */

    if ((argc < 2) || (((argc % 2) == 1) && (argc != 3))) {
        Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
                " channelId ?optionName? ?value? ?optionName value?...\"",
                (char *) NULL);
        return TCL_ERROR;
    }
    chan = Tcl_GetChannel(interp, argv[1], NULL);
    if (chan == (Tcl_Channel) NULL) {
        return TCL_ERROR;
    }
    if (argc == 2) {
        Tcl_DStringInit(&ds);
        if (Tcl_GetChannelOption(interp, chan, (char *) NULL, &ds) != TCL_OK) {
          Tcl_DStringFree(&ds);
          return TCL_ERROR;
        }
        Tcl_DStringResult(interp, &ds);
        return TCL_OK;
    }
    if (argc == 3) {
        Tcl_DStringInit(&ds);
        if (Tcl_GetChannelOption(interp, chan, argv[2], &ds) != TCL_OK) {
            Tcl_DStringFree(&ds);
            return TCL_ERROR;
        }
        Tcl_DStringResult(interp, &ds);
        return TCL_OK;
    }
    for (i = 3; i < argc; i += 2) {
        if (Tcl_SetChannelOption(interp, chan, argv[i-1], argv[i]) != TCL_OK) {
            return TCL_ERROR;
        }
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EofObjCmd --
 *
 *    This procedure is invoked to process the Tcl "eof" command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    Sets interp->result to "0" or "1" depending on whether the
 *    specified channel has an EOF condition.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_EofObjCmd(unused, interp, objc, objv)
    ClientData unused;        /* Not used. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tcl_Channel chan;               /* The channel to query for EOF. */
    int mode;                       /* Mode in which channel is opened. */
    char buf[40];
    char *arg;

    if (objc != 2) {
      Tcl_WrongNumArgs(interp, 1, objv, "channelId");
        return TCL_ERROR;
    }

    arg = Tcl_GetStringFromObj(objv[1], NULL);
    chan = Tcl_GetChannel(interp, arg, &mode);
    if (chan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }

    TclFormatInt(buf, Tcl_Eof(chan) ? 1 : 0);
    Tcl_SetResult(interp, buf, TCL_VOLATILE);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ExecCmd --
 *
 *    This procedure is invoked to process the "exec" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_ExecCmd(dummy, interp, argc, argv)
    ClientData dummy;               /* Not used. */
    Tcl_Interp *interp;             /* Current interpreter. */
    int argc;                       /* Number of arguments. */
    char **argv;              /* Argument strings. */
{
#ifdef MAC_TCL
    Tcl_AppendResult(interp, "exec not implemented under Mac OS",
            (char *)NULL);
    return TCL_ERROR;
#else /* !MAC_TCL */
    int keepNewline, firstWord, background, length, result;
    Tcl_Channel chan;
    Tcl_DString ds;
    int readSoFar, readNow, bufSize;

    /*
     * Check for a leading "-keepnewline" argument.
     */

    keepNewline = 0;
    for (firstWord = 1; (firstWord < argc) && (argv[firstWord][0] == '-');
        firstWord++) {
      if (strcmp(argv[firstWord], "-keepnewline") == 0) {
          keepNewline = 1;
      } else if (strcmp(argv[firstWord], "--") == 0) {
          firstWord++;
          break;
      } else {
          Tcl_AppendResult(interp, "bad switch \"", argv[firstWord],
                "\": must be -keepnewline or --", (char *) NULL);
          return TCL_ERROR;
      }
    }

    if (argc <= firstWord) {
      Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
            " ?switches? arg ?arg ...?\"", (char *) NULL);
      return TCL_ERROR;
    }

    /*
     * See if the command is to be run in background.
     */

    background = 0;
    if ((argv[argc-1][0] == '&') && (argv[argc-1][1] == 0)) {
      argc--;
      argv[argc] = NULL;
        background = 1;
    }
    
    chan = Tcl_OpenCommandChannel(interp, argc-firstWord,
            argv+firstWord,
          (background ? 0 : TCL_STDOUT | TCL_STDERR));

    if (chan == (Tcl_Channel) NULL) {
        return TCL_ERROR;
    }

    if (background) {

        /*
         * Get the list of PIDs from the pipeline into interp->result and
         * detach the PIDs (instead of waiting for them).
         */

        TclGetAndDetachPids(interp, chan);
        
        if (Tcl_Close(interp, chan) != TCL_OK) {
            return TCL_ERROR;
        }
        return TCL_OK;
    }

    if (Tcl_GetChannelHandle(chan, TCL_READABLE, NULL) == TCL_OK) {
#define     EXEC_BUFFER_SIZE 4096

        Tcl_DStringInit(&ds);
        readSoFar = 0; bufSize = 0;
        while (1) {
            bufSize += EXEC_BUFFER_SIZE;
            Tcl_DStringSetLength(&ds, bufSize);
            readNow = Tcl_Read(chan, Tcl_DStringValue(&ds) + readSoFar,
                    EXEC_BUFFER_SIZE);
            if (readNow < 0) {
                Tcl_DStringFree(&ds);
            Tcl_AppendResult(interp,
                  "error reading output from command: ",
                  Tcl_PosixError(interp), (char *) NULL);
                return TCL_ERROR;
            }
            readSoFar += readNow;
            if (readNow < EXEC_BUFFER_SIZE) {
                break;  /* Out of "while (1)" loop. */
            }
        }
        Tcl_DStringSetLength(&ds, readSoFar);
        Tcl_DStringResult(interp, &ds);
    }

    result = Tcl_Close(interp, chan);

    /*
     * If the last character of interp->result is a newline, then remove
     * the newline character (the newline would just confuse things).
     * Special hack: must replace the old terminating null character
     * as a signal to Tcl_AppendResult et al. that we've mucked with
     * the string.
     */
    
    length = strlen(interp->result);
    if (!keepNewline && (length > 0) &&
        (interp->result[length-1] == '\n')) {
        interp->result[length-1] = '\0';
        interp->result[length] = 'x';
    }

    return result;
#endif /* !MAC_TCL */
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FblockedObjCmd --
 *
 *    This procedure is invoked to process the Tcl "fblocked" command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    Sets interp->result to "0" or "1" depending on whether the
 *    a preceding input operation on the channel would have blocked.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_FblockedObjCmd(unused, interp, objc, objv)
    ClientData unused;        /* Not used. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tcl_Channel chan;               /* The channel to query for blocked. */
    int mode;                       /* Mode in which channel was opened. */
    char buf[40];
    char *arg;

    if (objc != 2) {
      Tcl_WrongNumArgs(interp, 1, objv, "channelId");
        return TCL_ERROR;
    }

    arg = Tcl_GetStringFromObj(objv[1], NULL);
    chan = Tcl_GetChannel(interp, arg, &mode);
    if (chan == (Tcl_Channel) NULL) {
        return TCL_ERROR;
    }
    if ((mode & TCL_READABLE) == 0) {
      Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "channel \"",
            Tcl_GetStringFromObj(objv[1], NULL), 
                "\" wasn't opened for reading", (char *) NULL);
        return TCL_ERROR;
    }
        
    TclFormatInt(buf, Tcl_InputBlocked(chan) ? 1 : 0);
    Tcl_SetResult(interp, buf, TCL_VOLATILE);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_OpenCmd --
 *
 *    This procedure is invoked to process the "open" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_OpenCmd(notUsed, interp, argc, argv)
    ClientData notUsed;             /* Not used. */
    Tcl_Interp *interp;             /* Current interpreter. */
    int argc;                       /* Number of arguments. */
    char **argv;              /* Argument strings. */
{
    int pipeline, prot;
    char *modeString;
    Tcl_Channel chan;

    if ((argc < 2) || (argc > 4)) {
      Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
            " fileName ?access? ?permissions?\"", (char *) NULL);
      return TCL_ERROR;
    }
    prot = 0666;
    if (argc == 2) {
      modeString = "r";
    } else {
      modeString = argv[2];
      if (argc == 4) {
          if (Tcl_GetInt(interp, argv[3], &prot) != TCL_OK) {
            return TCL_ERROR;
          }
      }
    }

    pipeline = 0;
    if (argv[1][0] == '|') {
      pipeline = 1;
    }

    /*
     * Open the file or create a process pipeline.
     */

    if (!pipeline) {
        chan = Tcl_OpenFileChannel(interp, argv[1], modeString, prot);
    } else {
#ifdef MAC_TCL
      Tcl_AppendResult(interp,
            "command pipelines not supported on Macintosh OS",
            (char *)NULL);
      return TCL_ERROR;
#else
      int mode, seekFlag, cmdArgc;
      char **cmdArgv;

        if (Tcl_SplitList(interp, argv[1]+1, &cmdArgc, &cmdArgv) != TCL_OK) {
            return TCL_ERROR;
        }

        mode = TclGetOpenMode(interp, modeString, &seekFlag);
        if (mode == -1) {
          chan = NULL;
        } else {
          int flags = TCL_STDERR | TCL_ENFORCE_MODE;
          switch (mode & (O_RDONLY | O_WRONLY | O_RDWR)) {
            case O_RDONLY:
                flags |= TCL_STDOUT;
                break;
            case O_WRONLY:
                flags |= TCL_STDIN;
                break;
            case O_RDWR:
                flags |= (TCL_STDIN | TCL_STDOUT);
                break;
            default:
                panic("Tcl_OpenCmd: invalid mode value");
                break;
          }
          chan = Tcl_OpenCommandChannel(interp, cmdArgc, cmdArgv, flags);
      }
        ckfree((char *) cmdArgv);
#endif
    }
    if (chan == (Tcl_Channel) NULL) {
        return TCL_ERROR;
    }
#ifdef KANJI
    (void) Tcl_SetChannelOption(NULL, chan, "-inputCode",
                Tcl_KanjiCodeStr[((Interp *)interp)->kanjiInputCode]);
    (void) Tcl_SetChannelOption(NULL, chan, "-outputCode",
                Tcl_KanjiCodeStr[((Interp *)interp)->kanjiOutputCode]);
#endif /* KANJI */
    Tcl_RegisterChannel(interp, chan);
    Tcl_AppendResult(interp, Tcl_GetChannelName(chan), (char *) NULL);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TcpAcceptCallbacksDeleteProc --
 *
 *    Assocdata cleanup routine called when an interpreter is being
 *    deleted to set the interp field of all the accept callback records
 *    registered with   the interpreter to NULL. This will prevent the
 *    interpreter from being used in the future to eval accept scripts.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Deallocates memory and sets the interp field of all the accept
 *    callback records to NULL to prevent this interpreter from being
 *    used subsequently to eval accept scripts.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
static void
TcpAcceptCallbacksDeleteProc(clientData, interp)
    ClientData clientData;    /* Data which was passed when the assocdata
                                 * was registered. */
    Tcl_Interp *interp;       /* Interpreter being deleted - not used. */
{
    Tcl_HashTable *hTblPtr;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch hSearch;
    AcceptCallback *acceptCallbackPtr;

    hTblPtr = (Tcl_HashTable *) clientData;
    for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch);
             hPtr != (Tcl_HashEntry *) NULL;
             hPtr = Tcl_NextHashEntry(&hSearch)) {
        acceptCallbackPtr = (AcceptCallback *) Tcl_GetHashValue(hPtr);
        acceptCallbackPtr->interp = (Tcl_Interp *) NULL;
    }
    Tcl_DeleteHashTable(hTblPtr);
    ckfree((char *) hTblPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * RegisterTcpServerInterpCleanup --
 *
 *    Registers an accept callback record to have its interp
 *    field set to NULL when the interpreter is deleted.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    When, in the future, the interpreter is deleted, the interp
 *    field of the accept callback data structure will be set to
 *    NULL. This will prevent attempts to eval the accept script
 *    in a deleted interpreter.
 *
 *----------------------------------------------------------------------
 */

static void
RegisterTcpServerInterpCleanup(interp, acceptCallbackPtr)
    Tcl_Interp *interp;       /* Interpreter for which we want to be
                                 * informed of deletion. */
    AcceptCallback *acceptCallbackPtr;
                        /* The accept callback record whose
                                 * interp field we want set to NULL when
                                 * the interpreter is deleted. */
{
    Tcl_HashTable *hTblPtr;   /* Hash table for accept callback
                                 * records to smash when the interpreter
                                 * will be deleted. */
    Tcl_HashEntry *hPtr;      /* Entry for this record. */
    int new;                  /* Is the entry new? */

    hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp,
            "tclTCPAcceptCallbacks",
            NULL);
    if (hTblPtr == (Tcl_HashTable *) NULL) {
        hTblPtr = (Tcl_HashTable *) ckalloc((unsigned) sizeof(Tcl_HashTable));
        Tcl_InitHashTable(hTblPtr, TCL_ONE_WORD_KEYS);
        (void) Tcl_SetAssocData(interp, "tclTCPAcceptCallbacks",
                TcpAcceptCallbacksDeleteProc, (ClientData) hTblPtr);
    }
    hPtr = Tcl_CreateHashEntry(hTblPtr, (char *) acceptCallbackPtr, &new);
    if (!new) {
        panic("RegisterTcpServerCleanup: damaged accept record table");
    }
    Tcl_SetHashValue(hPtr, (ClientData) acceptCallbackPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * UnregisterTcpServerInterpCleanupProc --
 *
 *    Unregister a previously registered accept callback record. The
 *    interp field of this record will no longer be set to NULL in
 *    the future when the interpreter is deleted.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Prevents the interp field of the accept callback record from
 *    being set to NULL in the future when the interpreter is deleted.
 *
 *----------------------------------------------------------------------
 */

static void
UnregisterTcpServerInterpCleanupProc(interp, acceptCallbackPtr)
    Tcl_Interp *interp;       /* Interpreter in which the accept callback
                                 * record was registered. */
    AcceptCallback *acceptCallbackPtr;
                        /* The record for which to delete the
                                 * registration. */
{
    Tcl_HashTable *hTblPtr;
    Tcl_HashEntry *hPtr;

    hTblPtr = (Tcl_HashTable *) Tcl_GetAssocData(interp,
            "tclTCPAcceptCallbacks", NULL);
    if (hTblPtr == (Tcl_HashTable *) NULL) {
        return;
    }
    hPtr = Tcl_FindHashEntry(hTblPtr, (char *) acceptCallbackPtr);
    if (hPtr == (Tcl_HashEntry *) NULL) {
        return;
    }
    Tcl_DeleteHashEntry(hPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * AcceptCallbackProc --
 *
 *    This callback is invoked by the TCP channel driver when it
 *    accepts a new connection from a client on a server socket.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Whatever the script does.
 *
 *----------------------------------------------------------------------
 */

static void
AcceptCallbackProc(callbackData, chan, address, port)
    ClientData callbackData;        /* The data stored when the callback
                                         * was created in the call to
                                         * Tcl_OpenTcpServer. */
    Tcl_Channel chan;               /* Channel for the newly accepted
                                         * connection. */
    char *address;                  /* Address of client that was
                                         * accepted. */
    int port;                       /* Port of client that was accepted. */
{
    AcceptCallback *acceptCallbackPtr;
    Tcl_Interp *interp;
    char *script;
    char portBuf[10];
    int result;

    acceptCallbackPtr = (AcceptCallback *) callbackData;

    /*
     * Check if the callback is still valid; the interpreter may have gone
     * away, this is signalled by setting the interp field of the callback
     * data to NULL.
     */
    
    if (acceptCallbackPtr->interp != (Tcl_Interp *) NULL) {

        script = acceptCallbackPtr->script;
        interp = acceptCallbackPtr->interp;
        
        Tcl_Preserve((ClientData) script);
        Tcl_Preserve((ClientData) interp);

      TclFormatInt(portBuf, port);
        Tcl_RegisterChannel(interp, chan);

        /*
         * Artificially bump the refcount to protect the channel from
         * being deleted while the script is being evaluated.
         */

        Tcl_RegisterChannel((Tcl_Interp *) NULL,  chan);
        
        result = Tcl_VarEval(interp, script, " ", Tcl_GetChannelName(chan),
                " ", address, " ", portBuf, (char *) NULL);
        if (result != TCL_OK) {
            Tcl_BackgroundError(interp);
          Tcl_UnregisterChannel(interp, chan);
        }

        /*
         * Decrement the artificially bumped refcount. After this it is
         * not safe anymore to use "chan", because it may now be deleted.
         */

        Tcl_UnregisterChannel((Tcl_Interp *) NULL, chan);
        
        Tcl_Release((ClientData) interp);
        Tcl_Release((ClientData) script);
    } else {

        /*
         * The interpreter has been deleted, so there is no useful
         * way to utilize the client socket - just close it.
         */

        Tcl_Close((Tcl_Interp *) NULL, chan);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TcpServerCloseProc --
 *
 *    This callback is called when the TCP server channel for which it
 *    was registered is being closed. It informs the interpreter in
 *    which the accept script is evaluated (if that interpreter still
 *    exists) that this channel no longer needs to be informed if the
 *    interpreter is deleted.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    In the future, if the interpreter is deleted this channel will
 *    no longer be informed.
 *
 *----------------------------------------------------------------------
 */

static void
TcpServerCloseProc(callbackData)
    ClientData callbackData;  /* The data passed in the call to
                                 * Tcl_CreateCloseHandler. */
{
    AcceptCallback *acceptCallbackPtr;
                        /* The actual data. */

    acceptCallbackPtr = (AcceptCallback *) callbackData;
    if (acceptCallbackPtr->interp != (Tcl_Interp *) NULL) {
        UnregisterTcpServerInterpCleanupProc(acceptCallbackPtr->interp,
                acceptCallbackPtr);
    }
    Tcl_EventuallyFree((ClientData) acceptCallbackPtr->script, TCL_DYNAMIC);
    ckfree((char *) acceptCallbackPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SocketCmd --
 *
 *    This procedure is invoked to process the "socket" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    Creates a socket based channel.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_SocketCmd(notUsed, interp, argc, argv)
    ClientData notUsed;             /* Not used. */
    Tcl_Interp *interp;             /* Current interpreter. */
    int argc;                       /* Number of arguments. */
    char **argv;              /* Argument strings. */
{
    int a, server, port;
    char *arg, *copyScript, *host, *script;
    char *myaddr = NULL;
    int myport = 0;
    int async = 0;
    Tcl_Channel chan;
    AcceptCallback *acceptCallbackPtr;
    
    server = 0;
    script = NULL;

    if (TclHasSockets(interp) != TCL_OK) {
      return TCL_ERROR;
    }

    for (a = 1; a < argc; a++) {
        arg = argv[a];
      if (arg[0] == '-') {
          if (strcmp(arg, "-server") == 0) {
                if (async == 1) {
                    Tcl_AppendResult(interp,
                            "cannot set -async option for server sockets",
                            (char *) NULL);
                    return TCL_ERROR;
                }
            server = 1;
            a++;
            if (a >= argc) {
                Tcl_AppendResult(interp,
                      "no argument given for -server option",
                            (char *) NULL);
                return TCL_ERROR;
            }
                script = argv[a];
            } else if (strcmp(arg, "-myaddr") == 0) {
            a++;
                if (a >= argc) {
                Tcl_AppendResult(interp,
                      "no argument given for -myaddr option",
                            (char *) NULL);
                return TCL_ERROR;
            }
                myaddr = argv[a];
            } else if (strcmp(arg, "-myport") == 0) {
            a++;
                if (a >= argc) {
                Tcl_AppendResult(interp,
                      "no argument given for -myport option",
                            (char *) NULL);
                return TCL_ERROR;
            }
            if (TclSockGetPort(interp, argv[a], "tcp", &myport)
                    != TCL_OK) {
                return TCL_ERROR;
            }
            } else if (strcmp(arg, "-async") == 0) {
                if (server == 1) {
                    Tcl_AppendResult(interp,
                            "cannot set -async option for server sockets",
                            (char *) NULL);
                    return TCL_ERROR;
                }
                async = 1;
          } else {
            Tcl_AppendResult(interp, "bad option \"", arg,
                        "\", must be -async, -myaddr, -myport, or -server",
                        (char *) NULL);
            return TCL_ERROR;
          }
      } else {
          break;
      }
    }
    if (server) {
        host = myaddr;        /* NULL implies INADDR_ANY */
      if (myport != 0) {
          Tcl_AppendResult(interp, "Option -myport is not valid for servers",
                NULL);
          return TCL_ERROR;
      }
    } else if (a < argc) {
      host = argv[a];
      a++;
    } else {
wrongNumArgs:
      Tcl_AppendResult(interp, "wrong # args: should be either:\n",
            argv[0],
                " ?-myaddr addr? ?-myport myport? ?-async? host port\n",
            argv[0],
                " -server command ?-myaddr addr? port",
                (char *) NULL);
        return TCL_ERROR;
    }

    if (a == argc-1) {
      if (TclSockGetPort(interp, argv[a], "tcp", &port) != TCL_OK) {
          return TCL_ERROR;
      }
    } else {
      goto wrongNumArgs;
    }

    if (server) {
        acceptCallbackPtr = (AcceptCallback *) ckalloc((unsigned)
                sizeof(AcceptCallback));
        copyScript = ckalloc((unsigned) strlen(script) + 1);
        strcpy(copyScript, script);
        acceptCallbackPtr->script = copyScript;
        acceptCallbackPtr->interp = interp;
        chan = Tcl_OpenTcpServer(interp, port, host, AcceptCallbackProc,
                (ClientData) acceptCallbackPtr);
        if (chan == (Tcl_Channel) NULL) {
            ckfree(copyScript);
            ckfree((char *) acceptCallbackPtr);
            return TCL_ERROR;
        }

        /*
         * Register with the interpreter to let us know when the
         * interpreter is deleted (by having the callback set the
         * acceptCallbackPtr->interp field to NULL). This is to
         * avoid trying to eval the script in a deleted interpreter.
         */

        RegisterTcpServerInterpCleanup(interp, acceptCallbackPtr);
        
        /*
         * Register a close callback. This callback will inform the
         * interpreter (if it still exists) that this channel does not
         * need to be informed when the interpreter is deleted.
         */
        
        Tcl_CreateCloseHandler(chan, TcpServerCloseProc,
                (ClientData) acceptCallbackPtr);
    } else {
        chan = Tcl_OpenTcpClient(interp, port, host, myaddr, myport, async);
        if (chan == (Tcl_Channel) NULL) {
            return TCL_ERROR;
        }
    }
    Tcl_RegisterChannel(interp, chan);            
    Tcl_AppendResult(interp, Tcl_GetChannelName(chan), (char *) NULL);
    
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FcopyObjCmd --
 *
 *    This procedure is invoked to process the "fcopy" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    Moves data between two channels and possibly sets up a
 *    background copy handler.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_FcopyObjCmd(dummy, interp, objc, objv)
    ClientData dummy;         /* Not used. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tcl_Channel inChan, outChan;
    char *arg;
    int mode, i;
    int toRead;
    Tcl_Obj *cmdPtr;
    static char* switches[] = { "-size", "-command", NULL };
    enum { FcopySize, FcopyCommand } index;

    if ((objc < 3) || (objc > 7) || (objc == 4) || (objc == 6)) {
      Tcl_WrongNumArgs(interp, 1, objv,
            "input output ?-size size? ?-command callback?");
      return TCL_ERROR;
    }

    /*
     * Parse the channel arguments and verify that they are readable
     * or writable, as appropriate.
     */

    arg = Tcl_GetStringFromObj(objv[1], NULL);
    inChan = Tcl_GetChannel(interp, arg, &mode);
    if (inChan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }
    if ((mode & TCL_READABLE) == 0) {
      Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "channel \"",
            Tcl_GetStringFromObj(objv[1], NULL), 
                "\" wasn't opened for reading", (char *) NULL);
        return TCL_ERROR;
    }
    arg = Tcl_GetStringFromObj(objv[2], NULL);
    outChan = Tcl_GetChannel(interp, arg, &mode);
    if (outChan == (Tcl_Channel) NULL) {
      return TCL_ERROR;
    }
    if ((mode & TCL_WRITABLE) == 0) {
      Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "channel \"",
            Tcl_GetStringFromObj(objv[1], NULL), 
                "\" wasn't opened for writing", (char *) NULL);
        return TCL_ERROR;
    }

    toRead = -1;
    cmdPtr = NULL;
    for (i = 3; i < objc; i += 2) {
      if (Tcl_GetIndexFromObj(interp, objv[i], switches, "switch", 0,
            (int *) &index) != TCL_OK) {
          return TCL_ERROR;
      }
      switch (index) {
          case FcopySize:
            if (Tcl_GetIntFromObj(interp, objv[i+1], &toRead) != TCL_OK) {
                return TCL_ERROR;
            }
            break;
          case FcopyCommand:
            cmdPtr = objv[i+1];
            break;
      }
    }

    return TclCopyChannel(interp, inChan, outChan, toRead, cmdPtr);
}

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