/*
* tclIOCmd.c --
*
* Contains the definitions of most of the Tcl commands relating to IO.
*
* Copyright (c) 1995-1997 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: tclIOCmd.c,v 1.51.2.3 2010/02/11 15:25:25 dkf Exp $
*/
#include "tclInt.h"
/*
* 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;
/*
* Thread local storage used to maintain a per-thread stdout channel obj.
* It must be per-thread because of std channel limitations.
*/
typedef struct ThreadSpecificData {
int initialized; /* Set to 1 when the module is initialized. */
Tcl_Obj *stdoutObjPtr; /* Cached stdout channel Tcl_Obj */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;
/*
* Static functions for this file:
*/
static void FinalizeIOCmdTSD(ClientData clientData);
static void AcceptCallbackProc(ClientData callbackData,
Tcl_Channel chan, char *address, int port);
static int ChanPendingObjCmd(ClientData unused,
Tcl_Interp *interp, int objc,
Tcl_Obj *const objv[]);
static int ChanTruncateObjCmd(ClientData dummy,
Tcl_Interp *interp, int objc,
Tcl_Obj *const objv[]);
static void RegisterTcpServerInterpCleanup(Tcl_Interp *interp,
AcceptCallback *acceptCallbackPtr);
static void TcpAcceptCallbacksDeleteProc(ClientData clientData,
Tcl_Interp *interp);
static void TcpServerCloseProc(ClientData callbackData);
static void UnregisterTcpServerInterpCleanupProc(
Tcl_Interp *interp,
AcceptCallback *acceptCallbackPtr);
/*
*----------------------------------------------------------------------
*
* FinalizeIOCmdTSD --
*
* Release the storage associated with the per-thread cache.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
FinalizeIOCmdTSD(
ClientData clientData) /* Not used. */
{
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (tsdPtr->stdoutObjPtr != NULL) {
Tcl_DecrRefCount(tsdPtr->stdoutObjPtr);
tsdPtr->stdoutObjPtr = NULL;
}
tsdPtr->initialized = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_PutsObjCmd --
*
* This function 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(
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. */
Tcl_Obj *string; /* String to write. */
Tcl_Obj *chanObjPtr = NULL; /* channel object. */
int newline; /* Add a newline at end? */
int result; /* Result of puts operation. */
int mode; /* Mode in which channel is opened. */
ThreadSpecificData *tsdPtr;
switch (objc) {
case 2: /* [puts $x] */
string = objv[1];
newline = 1;
break;
case 3: /* [puts -nonewline $x] or [puts $chan $x] */
if (strcmp(TclGetString(objv[1]), "-nonewline") == 0) {
newline = 0;
} else {
newline = 1;
chanObjPtr = objv[1];
}
string = objv[2];
break;
case 4: /* [puts -nonewline $chan $x] or [puts $chan $x nonewline] */
if (strcmp(TclGetString(objv[1]), "-nonewline") == 0) {
chanObjPtr = objv[2];
string = objv[3];
} else {
/*
* The code below provides backwards compatibility with an old
* form of the command that is no longer recommended or
* documented.
*/
char *arg;
int length;
arg = TclGetStringFromObj(objv[3], &length);
if ((length != 9)
|| (strncmp(arg, "nonewline", (size_t) length) != 0)) {
Tcl_AppendResult(interp, "bad argument \"", arg,
"\": should be \"nonewline\"", NULL);
return TCL_ERROR;
}
chanObjPtr = objv[1];
string = objv[2];
}
newline = 0;
break;
default:
/* [puts] or [puts some bad number of arguments...] */
Tcl_WrongNumArgs(interp, 1, objv, "?-nonewline? ?channelId? string");
return TCL_ERROR;
}
if (chanObjPtr == NULL) {
tsdPtr = TCL_TSD_INIT(&dataKey);
if (!tsdPtr->initialized) {
tsdPtr->initialized = 1;
TclNewLiteralStringObj(tsdPtr->stdoutObjPtr, "stdout");
Tcl_IncrRefCount(tsdPtr->stdoutObjPtr);
Tcl_CreateThreadExitHandler(FinalizeIOCmdTSD, NULL);
}
chanObjPtr = tsdPtr->stdoutObjPtr;
}
if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
return TCL_ERROR;
}
if ((mode & TCL_WRITABLE) == 0) {
Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
"\" wasn't opened for writing", NULL);
return TCL_ERROR;
}
result = Tcl_WriteObj(chan, string);
if (result < 0) {
goto error;
}
if (newline != 0) {
result = Tcl_WriteChars(chan, "\n", 1);
if (result < 0) {
goto error;
}
}
return TCL_OK;
/*
* TIP #219.
* Capture error messages put by the driver into the bypass area and put
* them into the regular interpreter result. Fall back to the regular
* message if nothing was found in the bypass.
*/
error:
if (!TclChanCaughtErrorBypass(interp, chan)) {
Tcl_AppendResult(interp, "error writing \"",
TclGetString(chanObjPtr), "\": ",
Tcl_PosixError(interp), NULL);
}
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FlushObjCmd --
*
* This function 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(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Obj *chanObjPtr;
Tcl_Channel chan; /* The channel to flush on. */
int mode;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "channelId");
return TCL_ERROR;
}
chanObjPtr = objv[1];
if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
return TCL_ERROR;
}
if ((mode & TCL_WRITABLE) == 0) {
Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
"\" wasn't opened for writing", NULL);
return TCL_ERROR;
}
if (Tcl_Flush(chan) != TCL_OK) {
/*
* TIP #219.
* Capture error messages put by the driver into the bypass area and
* put them into the regular interpreter result. Fall back to the
* regular message if nothing was found in the bypass.
*/
if (!TclChanCaughtErrorBypass(interp, chan)) {
Tcl_AppendResult(interp, "error flushing \"",
TclGetString(chanObjPtr), "\": ",
Tcl_PosixError(interp), NULL);
}
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetsObjCmd --
*
* This function 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(
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. */
Tcl_Obj *linePtr, *chanObjPtr;
if ((objc != 2) && (objc != 3)) {
Tcl_WrongNumArgs(interp, 1, objv, "channelId ?varName?");
return TCL_ERROR;
}
chanObjPtr = objv[1];
if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
return TCL_ERROR;
}
if ((mode & TCL_READABLE) == 0) {
Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
"\" wasn't opened for reading", NULL);
return TCL_ERROR;
}
linePtr = Tcl_NewObj();
lineLen = Tcl_GetsObj(chan, linePtr);
if (lineLen < 0) {
if (!Tcl_Eof(chan) && !Tcl_InputBlocked(chan)) {
Tcl_DecrRefCount(linePtr);
/*
* TIP #219. Capture error messages put by the driver into the
* bypass area and put them into the regular interpreter result.
* Fall back to the regular message if nothing was found in the
* bypass.
*/
if (!TclChanCaughtErrorBypass(interp, chan)) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "error reading \"",
TclGetString(chanObjPtr), "\": ",
Tcl_PosixError(interp), NULL);
}
return TCL_ERROR;
}
lineLen = -1;
}
if (objc == 3) {
if (Tcl_ObjSetVar2(interp, objv[2], NULL, linePtr,
TCL_LEAVE_ERR_MSG) == NULL) {
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(lineLen));
return TCL_OK;
} else {
Tcl_SetObjResult(interp, linePtr);
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ReadObjCmd --
*
* This function 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(
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 charactersRead; /* How many characters were read? */
int mode; /* Mode in which channel is opened. */
Tcl_Obj *resultPtr, *chanObjPtr;
if ((objc != 2) && (objc != 3)) {
Interp *iPtr;
argerror:
iPtr = (Interp *) interp;
Tcl_WrongNumArgs(interp, 1, objv, "channelId ?numChars?");
/*
* Do not append directly; that makes ensembles using this command as
* a subcommand produce the wrong message.
*/
iPtr->flags |= INTERP_ALTERNATE_WRONG_ARGS;
Tcl_WrongNumArgs(interp, 1, objv, "?-nonewline? channelId");
iPtr->flags &= ~INTERP_ALTERNATE_WRONG_ARGS;
return TCL_ERROR;
}
i = 1;
newline = 0;
if (strcmp(TclGetString(objv[1]), "-nonewline") == 0) {
newline = 1;
i++;
}
if (i == objc) {
goto argerror;
}
chanObjPtr = objv[i];
if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
return TCL_ERROR;
}
if ((mode & TCL_READABLE) == 0) {
Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
"\" wasn't opened for reading", NULL);
return TCL_ERROR;
}
i++; /* Consumed channel name. */
/*
* Compute how many bytes to read, and see whether the final newline
* should be dropped.
*/
toRead = -1;
if (i < objc) {
char *arg;
arg = TclGetString(objv[i]);
if (isdigit(UCHAR(arg[0]))) { /* INTL: digit */
if (TclGetIntFromObj(interp, objv[i], &toRead) != TCL_OK) {
return TCL_ERROR;
}
} else if (strcmp(arg, "nonewline") == 0) {
newline = 1;
} else {
Tcl_AppendResult(interp, "bad argument \"", arg,
"\": should be \"nonewline\"", NULL);
return TCL_ERROR;
}
}
resultPtr = Tcl_NewObj();
Tcl_IncrRefCount(resultPtr);
charactersRead = Tcl_ReadChars(chan, resultPtr, toRead, 0);
if (charactersRead < 0) {
/*
* TIP #219.
* Capture error messages put by the driver into the bypass area and
* put them into the regular interpreter result. Fall back to the
* regular message if nothing was found in the bypass.
*/
if (!TclChanCaughtErrorBypass(interp, chan)) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "error reading \"",
TclGetString(chanObjPtr), "\": ",
Tcl_PosixError(interp), NULL);
}
Tcl_DecrRefCount(resultPtr);
return TCL_ERROR;
}
/*
* If requested, remove the last newline in the channel if at EOF.
*/
if ((charactersRead > 0) && (newline != 0)) {
char *result;
int length;
result = TclGetStringFromObj(resultPtr, &length);
if (result[length - 1] == '\n') {
Tcl_SetObjLength(resultPtr, length - 1);
}
}
Tcl_SetObjResult(interp, resultPtr);
Tcl_DecrRefCount(resultPtr);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SeekObjCmd --
*
* This function 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_SeekObjCmd(
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 tell on. */
Tcl_WideInt offset; /* Where to seek? */
int mode; /* How to seek? */
Tcl_WideInt result; /* Of calling Tcl_Seek. */
int optionIndex;
static const char *originOptions[] = {
"start", "current", "end", NULL
};
static int modeArray[] = {SEEK_SET, SEEK_CUR, SEEK_END};
if ((objc != 3) && (objc != 4)) {
Tcl_WrongNumArgs(interp, 1, objv, "channelId offset ?origin?");
return TCL_ERROR;
}
if (TclGetChannelFromObj(interp, objv[1], &chan, NULL, 0) != TCL_OK) {
return TCL_ERROR;
}
if (Tcl_GetWideIntFromObj(interp, objv[2], &offset) != TCL_OK) {
return TCL_ERROR;
}
mode = SEEK_SET;
if (objc == 4) {
if (Tcl_GetIndexFromObj(interp, objv[3], originOptions, "origin", 0,
&optionIndex) != TCL_OK) {
return TCL_ERROR;
}
mode = modeArray[optionIndex];
}
result = Tcl_Seek(chan, offset, mode);
if (result == Tcl_LongAsWide(-1)) {
/*
* TIP #219.
* Capture error messages put by the driver into the bypass area and
* put them into the regular interpreter result. Fall back to the
* regular message if nothing was found in the bypass.
*/
if (!TclChanCaughtErrorBypass(interp, chan)) {
Tcl_AppendResult(interp, "error during seek on \"",
TclGetString(objv[1]), "\": ",
Tcl_PosixError(interp), NULL);
}
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_TellObjCmd --
*
* This function 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_TellObjCmd(
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 tell on. */
Tcl_WideInt newLoc;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "channelId");
return TCL_ERROR;
}
/*
* Try to find a channel with the right name and permissions in the IO
* channel table of this interpreter.
*/
if (TclGetChannelFromObj(interp, objv[1], &chan, NULL, 0) != TCL_OK) {
return TCL_ERROR;
}
newLoc = Tcl_Tell(chan);
/*
* TIP #219.
* Capture error messages put by the driver into the bypass area and put
* them into the regular interpreter result.
*/
if (TclChanCaughtErrorBypass(interp, chan)) {
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(newLoc));
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_CloseObjCmd --
*
* This function 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 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. */
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "channelId");
return TCL_ERROR;
}
if (TclGetChannelFromObj(interp, objv[1], &chan, NULL, 0) != TCL_OK) {
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's 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.
*/
Tcl_Obj *resultPtr = Tcl_GetObjResult(interp);
char *string;
int len;
if (Tcl_IsShared(resultPtr)) {
resultPtr = Tcl_DuplicateObj(resultPtr);
Tcl_SetObjResult(interp, resultPtr);
}
string = TclGetStringFromObj(resultPtr, &len);
if ((len > 0) && (string[len - 1] == '\n')) {
Tcl_SetObjLength(resultPtr, len - 1);
}
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FconfigureObjCmd --
*
* This function 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_FconfigureObjCmd(
ClientData clientData, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
char *optionName, *valueName;
Tcl_Channel chan; /* The channel to set a mode on. */
int i; /* Iterate over arg-value pairs. */
if ((objc < 2) || (((objc % 2) == 1) && (objc != 3))) {
Tcl_WrongNumArgs(interp, 1, objv,
"channelId ?optionName? ?value? ?optionName value?...");
return TCL_ERROR;
}
if (TclGetChannelFromObj(interp, objv[1], &chan, NULL, 0) != TCL_OK) {
return TCL_ERROR;
}
if (objc == 2) {
Tcl_DString ds; /* DString to hold result of calling
* Tcl_GetChannelOption. */
Tcl_DStringInit(&ds);
if (Tcl_GetChannelOption(interp, chan, NULL, &ds) != TCL_OK) {
Tcl_DStringFree(&ds);
return TCL_ERROR;
}
Tcl_DStringResult(interp, &ds);
return TCL_OK;
} else if (objc == 3) {
Tcl_DString ds; /* DString to hold result of calling
* Tcl_GetChannelOption. */
Tcl_DStringInit(&ds);
optionName = TclGetString(objv[2]);
if (Tcl_GetChannelOption(interp, chan, optionName, &ds) != TCL_OK) {
Tcl_DStringFree(&ds);
return TCL_ERROR;
}
Tcl_DStringResult(interp, &ds);
return TCL_OK;
}
for (i = 3; i < objc; i += 2) {
optionName = TclGetString(objv[i-1]);
valueName = TclGetString(objv[i]);
if (Tcl_SetChannelOption(interp, chan, optionName, valueName)
!= TCL_OK) {
return TCL_ERROR;
}
}
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_EofObjCmd --
*
* This function 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's result to boolean true or false depending on whether the
* specified channel has an EOF condition.
*
*---------------------------------------------------------------------------
*/
/* ARGSUSED */
int
Tcl_EofObjCmd(
ClientData unused, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Channel chan;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "channelId");
return TCL_ERROR;
}
if (TclGetChannelFromObj(interp, objv[1], &chan, NULL, 0) != TCL_OK) {
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewBooleanObj(Tcl_Eof(chan)));
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_ExecObjCmd --
*
* This function 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_ExecObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
/*
* This function generates an argv array for the string arguments. It
* starts out with stack-allocated space but uses dynamically-allocated
* storage if needed.
*/
Tcl_Obj *resultPtr;
const char **argv;
char *string;
Tcl_Channel chan;
int argc, background, i, index, keepNewline, result, skip, length;
int ignoreStderr;
static const char *options[] = {
"-ignorestderr", "-keepnewline", "--", NULL
};
enum options {
EXEC_IGNORESTDERR, EXEC_KEEPNEWLINE, EXEC_LAST
};
/*
* Check for any leading option arguments.
*/
keepNewline = 0;
ignoreStderr = 0;
for (skip = 1; skip < objc; skip++) {
string = TclGetString(objv[skip]);
if (string[0] != '-') {
break;
}
if (Tcl_GetIndexFromObj(interp, objv[skip], options, "switch",
TCL_EXACT, &index) != TCL_OK) {
return TCL_ERROR;
}
if (index == EXEC_KEEPNEWLINE) {
keepNewline = 1;
} else if (index == EXEC_IGNORESTDERR) {
ignoreStderr = 1;
} else {
skip++;
break;
}
}
if (objc <= skip) {
Tcl_WrongNumArgs(interp, 1, objv, "?switches? arg ?arg ...?");
return TCL_ERROR;
}
/*
* See if the command is to be run in background.
*/
background = 0;
string = TclGetString(objv[objc - 1]);
if ((string[0] == '&') && (string[1] == '\0')) {
objc--;
background = 1;
}
/*
* Create the string argument array "argv". Make sure argv is large enough
* to hold the argc arguments plus 1 extra for the zero end-of-argv word.
*/
argc = objc - skip;
argv = (const char **)
TclStackAlloc(interp, (unsigned)(argc + 1) * sizeof(char *));
/*
* Copy the string conversions of each (post option) object into the
* argument vector.
*/
for (i = 0; i < argc; i++) {
argv[i] = TclGetString(objv[i + skip]);
}
argv[argc] = NULL;
chan = Tcl_OpenCommandChannel(interp, argc, argv, (background ? 0 :
(ignoreStderr ? TCL_STDOUT : TCL_STDOUT|TCL_STDERR)));
/*
* Free the argv array.
*/
TclStackFree(interp, (void *)argv);
if (chan == NULL) {
return TCL_ERROR;
}
if (background) {
/*
* Store the list of PIDs from the pipeline in interp's 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;
}
resultPtr = Tcl_NewObj();
if (Tcl_GetChannelHandle(chan, TCL_READABLE, NULL) == TCL_OK) {
if (Tcl_ReadChars(chan, resultPtr, -1, 0) < 0) {
/*
* TIP #219.
* Capture error messages put by the driver into the bypass area
* and put them into the regular interpreter result. Fall back to
* the regular message if nothing was found in the bypass.
*/
if (!TclChanCaughtErrorBypass(interp, chan)) {
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "error reading output from command: ",
Tcl_PosixError(interp), NULL);
Tcl_DecrRefCount(resultPtr);
}
return TCL_ERROR;
}
}
/*
* If the process produced anything on stderr, it will have been returned
* in the interpreter result. It needs to be appended to the result
* string.
*/
result = Tcl_Close(interp, chan);
Tcl_AppendObjToObj(resultPtr, Tcl_GetObjResult(interp));
/*
* If the last character of the result is a newline, then remove the
* newline character.
*/
if (keepNewline == 0) {
string = TclGetStringFromObj(resultPtr, &length);
if ((length > 0) && (string[length - 1] == '\n')) {
Tcl_SetObjLength(resultPtr, length - 1);
}
}
Tcl_SetObjResult(interp, resultPtr);
return result;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FblockedObjCmd --
*
* This function 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's result to boolean true or false depending on whether the
* preceeding input operation on the channel would have blocked.
*
*---------------------------------------------------------------------------
*/
/* ARGSUSED */
int
Tcl_FblockedObjCmd(
ClientData unused, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Channel chan;
int mode;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "channelId");
return TCL_ERROR;
}
if (TclGetChannelFromObj(interp, objv[1], &chan, &mode, 0) != TCL_OK) {
return TCL_ERROR;
}
if ((mode & TCL_READABLE) == 0) {
Tcl_AppendResult(interp, "channel \"", TclGetString(objv[1]),
"\" wasn't opened for reading", NULL);
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewBooleanObj(Tcl_InputBlocked(chan)));
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_OpenObjCmd --
*
* This function 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_OpenObjCmd(
ClientData notUsed, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
int pipeline, prot;
const char *modeString, *what;
Tcl_Channel chan;
if ((objc < 2) || (objc > 4)) {
Tcl_WrongNumArgs(interp, 1, objv, "fileName ?access? ?permissions?");
return TCL_ERROR;
}
prot = 0666;
if (objc == 2) {
modeString = "r";
} else {
modeString = TclGetString(objv[2]);
if (objc == 4) {
char *permString = TclGetString(objv[3]);
int code = TCL_ERROR;
int scanned = TclParseAllWhiteSpace(permString, -1);
/* Support legacy octal numbers */
if ((permString[scanned] == '0')
&& (permString[scanned+1] >= '0')
&& (permString[scanned+1] <= '7')) {
Tcl_Obj *permObj;
TclNewLiteralStringObj(permObj, "0o");
Tcl_AppendToObj(permObj, permString+scanned+1, -1);
code = TclGetIntFromObj(NULL, permObj, &prot);
Tcl_DecrRefCount(permObj);
}
if ((code == TCL_ERROR)
&& TclGetIntFromObj(interp, objv[3], &prot) != TCL_OK) {
return TCL_ERROR;
}
}
}
pipeline = 0;
what = TclGetString(objv[1]);
if (what[0] == '|') {
pipeline = 1;
}
/*
* Open the file or create a process pipeline.
*/
if (!pipeline) {
chan = Tcl_FSOpenFileChannel(interp, objv[1], modeString, prot);
} else {
int mode, seekFlag, cmdObjc, binary;
const char **cmdArgv;
if (Tcl_SplitList(interp, what+1, &cmdObjc, &cmdArgv) != TCL_OK) {
return TCL_ERROR;
}
mode = TclGetOpenModeEx(interp, modeString, &seekFlag, &binary);
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:
Tcl_Panic("Tcl_OpenCmd: invalid mode value");
break;
}
chan = Tcl_OpenCommandChannel(interp, cmdObjc, cmdArgv, flags);
if (binary && chan) {
Tcl_SetChannelOption(interp, chan, "-translation", "binary");
}
}
ckfree((char *) cmdArgv);
}
if (chan == NULL) {
return TCL_ERROR;
}
Tcl_RegisterChannel(interp, chan);
Tcl_AppendResult(interp, Tcl_GetChannelName(chan), 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 clientData, /* Data which was passed when the assocdata
* was registered. */
Tcl_Interp *interp) /* Interpreter being deleted - not used. */
{
Tcl_HashTable *hTblPtr = clientData;
Tcl_HashEntry *hPtr;
Tcl_HashSearch hSearch;
for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch);
hPtr != NULL; hPtr = Tcl_NextHashEntry(&hSearch)) {
AcceptCallback *acceptCallbackPtr = Tcl_GetHashValue(hPtr);
acceptCallbackPtr->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(
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 isNew; /* Is the entry new? */
hTblPtr = (Tcl_HashTable *)
Tcl_GetAssocData(interp, "tclTCPAcceptCallbacks", NULL);
if (hTblPtr == NULL) {
hTblPtr = (Tcl_HashTable *) ckalloc((unsigned) sizeof(Tcl_HashTable));
Tcl_InitHashTable(hTblPtr, TCL_ONE_WORD_KEYS);
(void) Tcl_SetAssocData(interp, "tclTCPAcceptCallbacks",
TcpAcceptCallbacksDeleteProc, hTblPtr);
}
hPtr = Tcl_CreateHashEntry(hTblPtr, (char *) acceptCallbackPtr, &isNew);
if (!isNew) {
Tcl_Panic("RegisterTcpServerCleanup: damaged accept record table");
}
Tcl_SetHashValue(hPtr, 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(
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 == NULL) {
return;
}
hPtr = Tcl_FindHashEntry(hTblPtr, (char *) acceptCallbackPtr);
if (hPtr != NULL) {
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(
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 = (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 != NULL) {
char portBuf[TCL_INTEGER_SPACE];
char *script = acceptCallbackPtr->script;
Tcl_Interp *interp = acceptCallbackPtr->interp;
int result;
Tcl_Preserve(script);
Tcl_Preserve(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(NULL, chan);
result = Tcl_VarEval(interp, script, " ", Tcl_GetChannelName(chan),
" ", address, " ", portBuf, NULL);
if (result != TCL_OK) {
TclBackgroundException(interp, result);
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(NULL, chan);
Tcl_Release(interp);
Tcl_Release(script);
} else {
/*
* The interpreter has been deleted, so there is no useful way to
* utilize the client socket - just close it.
*/
Tcl_Close(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(
ClientData callbackData) /* The data passed in the call to
* Tcl_CreateCloseHandler. */
{
AcceptCallback *acceptCallbackPtr = (AcceptCallback *) callbackData;
/* The actual data. */
if (acceptCallbackPtr->interp != NULL) {
UnregisterTcpServerInterpCleanupProc(acceptCallbackPtr->interp,
acceptCallbackPtr);
}
Tcl_EventuallyFree(acceptCallbackPtr->script, TCL_DYNAMIC);
ckfree((char *) acceptCallbackPtr);
}
/*
*----------------------------------------------------------------------
*
* Tcl_SocketObjCmd --
*
* This function 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_SocketObjCmd(
ClientData notUsed, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
static const char *socketOptions[] = {
"-async", "-myaddr", "-myport","-server", NULL
};
enum socketOptions {
SKT_ASYNC, SKT_MYADDR, SKT_MYPORT, SKT_SERVER
};
int optionIndex, a, server = 0, port, myport = 0, async = 0;
char *host, *script = NULL, *myaddr = NULL;
Tcl_Channel chan;
if (TclpHasSockets(interp) != TCL_OK) {
return TCL_ERROR;
}
for (a = 1; a < objc; a++) {
const char *arg = Tcl_GetString(objv[a]);
if (arg[0] != '-') {
break;
}
if (Tcl_GetIndexFromObj(interp, objv[a], socketOptions, "option",
TCL_EXACT, &optionIndex) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum socketOptions) optionIndex) {
case SKT_ASYNC:
if (server == 1) {
Tcl_AppendResult(interp,
"cannot set -async option for server sockets", NULL);
return TCL_ERROR;
}
async = 1;
break;
case SKT_MYADDR:
a++;
if (a >= objc) {
Tcl_AppendResult(interp,
"no argument given for -myaddr option", NULL);
return TCL_ERROR;
}
myaddr = TclGetString(objv[a]);
break;
case SKT_MYPORT: {
char *myPortName;
a++;
if (a >= objc) {
Tcl_AppendResult(interp,
"no argument given for -myport option", NULL);
return TCL_ERROR;
}
myPortName = TclGetString(objv[a]);
if (TclSockGetPort(interp, myPortName, "tcp", &myport) != TCL_OK) {
return TCL_ERROR;
}
break;
}
case SKT_SERVER:
if (async == 1) {
Tcl_AppendResult(interp,
"cannot set -async option for server sockets", NULL);
return TCL_ERROR;
}
server = 1;
a++;
if (a >= objc) {
Tcl_AppendResult(interp,
"no argument given for -server option", NULL);
return TCL_ERROR;
}
script = TclGetString(objv[a]);
break;
default:
Tcl_Panic("Tcl_SocketObjCmd: bad option index to SocketOptions");
}
}
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 < objc) {
host = TclGetString(objv[a]);
a++;
} else {
Interp *iPtr;
wrongNumArgs:
iPtr = (Interp *) interp;
Tcl_WrongNumArgs(interp, 1, objv,
"?-myaddr addr? ?-myport myport? ?-async? host port");
iPtr->flags |= INTERP_ALTERNATE_WRONG_ARGS;
Tcl_WrongNumArgs(interp, 1, objv,
"-server command ?-myaddr addr? port");
iPtr->flags &= ~INTERP_ALTERNATE_WRONG_ARGS;
return TCL_ERROR;
}
if (a == objc-1) {
if (TclSockGetPort(interp, TclGetString(objv[a]), "tcp",
&port) != TCL_OK) {
return TCL_ERROR;
}
} else {
goto wrongNumArgs;
}
if (server) {
AcceptCallback *acceptCallbackPtr = (AcceptCallback *)
ckalloc((unsigned) sizeof(AcceptCallback));
unsigned len = strlen(script) + 1;
char *copyScript = ckalloc(len);
memcpy(copyScript, script, len);
acceptCallbackPtr->script = copyScript;
acceptCallbackPtr->interp = interp;
chan = Tcl_OpenTcpServer(interp, port, host, AcceptCallbackProc,
acceptCallbackPtr);
if (chan == 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 interp field of the
* acceptCallbackPtr's structure 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, acceptCallbackPtr);
} else {
chan = Tcl_OpenTcpClient(interp, port, host, myaddr, myport, async);
if (chan == NULL) {
return TCL_ERROR;
}
}
Tcl_RegisterChannel(interp, chan);
Tcl_AppendResult(interp, Tcl_GetChannelName(chan), NULL);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FcopyObjCmd --
*
* This function 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(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Channel inChan, outChan;
int mode, i, toRead, index;
Tcl_Obj *cmdPtr;
static const char* switches[] = { "-size", "-command", NULL };
enum { FcopySize, FcopyCommand };
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.
*/
if (TclGetChannelFromObj(interp, objv[1], &inChan, &mode, 0) != TCL_OK) {
return TCL_ERROR;
}
if ((mode & TCL_READABLE) == 0) {
Tcl_AppendResult(interp, "channel \"", TclGetString(objv[1]),
"\" wasn't opened for reading", NULL);
return TCL_ERROR;
}
if (TclGetChannelFromObj(interp, objv[2], &outChan, &mode, 0) != TCL_OK) {
return TCL_ERROR;
}
if ((mode & TCL_WRITABLE) == 0) {
Tcl_AppendResult(interp, "channel \"", TclGetString(objv[2]),
"\" wasn't opened for writing", NULL);
return TCL_ERROR;
}
toRead = -1;
cmdPtr = NULL;
for (i = 3; i < objc; i += 2) {
if (Tcl_GetIndexFromObj(interp, objv[i], switches, "switch", 0,
&index) != TCL_OK) {
return TCL_ERROR;
}
switch (index) {
case FcopySize:
if (TclGetIntFromObj(interp, objv[i+1], &toRead) != TCL_OK) {
return TCL_ERROR;
}
if (toRead<0) {
/*
* Handle all negative sizes like -1, meaning 'copy all'. By
* resetting toRead we avoid changes in the core copying
* functions (which explicitly check for -1 and crash on any
* other negative value).
*/
toRead = -1;
}
break;
case FcopyCommand:
cmdPtr = objv[i+1];
break;
}
}
return TclCopyChannel(interp, inChan, outChan, toRead, cmdPtr);
}
/*
*---------------------------------------------------------------------------
*
* ChanPendingObjCmd --
*
* This function is invoked to process the Tcl "chan pending" command
* (TIP #287). See the user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* Sets interp's result to the number of bytes of buffered input or
* output (depending on whether the first argument is "input" or
* "output"), or -1 if the channel wasn't opened for that mode.
*
*---------------------------------------------------------------------------
*/
/* ARGSUSED */
static int
ChanPendingObjCmd(
ClientData unused, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Channel chan;
int index, mode;
static const char *options[] = {"input", "output", NULL};
enum options {PENDING_INPUT, PENDING_OUTPUT};
if (objc != 3) {
Tcl_WrongNumArgs(interp, 1, objv, "mode channelId");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], options, "mode", 0,
&index) != TCL_OK) {
return TCL_ERROR;
}
if (TclGetChannelFromObj(interp, objv[2], &chan, &mode, 0) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum options) index) {
case PENDING_INPUT:
if ((mode & TCL_READABLE) == 0) {
Tcl_SetObjResult(interp, Tcl_NewIntObj(-1));
} else {
Tcl_SetObjResult(interp, Tcl_NewIntObj(Tcl_InputBuffered(chan)));
}
break;
case PENDING_OUTPUT:
if ((mode & TCL_WRITABLE) == 0) {
Tcl_SetObjResult(interp, Tcl_NewIntObj(-1));
} else {
Tcl_SetObjResult(interp, Tcl_NewIntObj(Tcl_OutputBuffered(chan)));
}
break;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ChanTruncateObjCmd --
*
* This function is invoked to process the "chan truncate" Tcl command.
* See the user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* Truncates a channel (or rather a file underlying a channel).
*
*----------------------------------------------------------------------
*/
static int
ChanTruncateObjCmd(
ClientData dummy, /* Not used. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
Tcl_Channel chan;
Tcl_WideInt length;
if ((objc < 2) || (objc > 3)) {
Tcl_WrongNumArgs(interp, 1, objv, "channelId ?length?");
return TCL_ERROR;
}
if (TclGetChannelFromObj(interp, objv[1], &chan, NULL, 0) != TCL_OK) {
return TCL_ERROR;
}
if (objc == 3) {
/*
* User is supplying an explicit length.
*/
if (Tcl_GetWideIntFromObj(interp, objv[2], &length) != TCL_OK) {
return TCL_ERROR;
}
if (length < 0) {
Tcl_AppendResult(interp,
"cannot truncate to negative length of file", NULL);
return TCL_ERROR;
}
} else {
/*
* User wants to truncate to the current file position.
*/
length = Tcl_Tell(chan);
if (length == Tcl_WideAsLong(-1)) {
Tcl_AppendResult(interp,
"could not determine current location in \"",
TclGetString(objv[1]), "\": ",
Tcl_PosixError(interp), NULL);
return TCL_ERROR;
}
}
if (Tcl_TruncateChannel(chan, length) != TCL_OK) {
Tcl_AppendResult(interp, "error during truncate on \"",
TclGetString(objv[1]), "\": ",
Tcl_PosixError(interp), NULL);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclInitChanCmd --
*
* This function is invoked to create the "chan" Tcl command. See the
* user documentation for details on what it does.
*
* Results:
* A Tcl command handle.
*
* Side effects:
* None (since nothing is byte-compiled).
*
*----------------------------------------------------------------------
*/
Tcl_Command
TclInitChanCmd(
Tcl_Interp *interp)
{
/*
* Most commands are plugged directly together, but some are done via
* alias-like rewriting; [chan configure] is this way for security reasons
* (want overwriting of [fconfigure] to control that nicely), and [chan
* names] because the functionality isn't available as a separate command
* function at the moment.
*/
static const EnsembleImplMap initMap[] = {
{"blocked", Tcl_FblockedObjCmd},
{"close", Tcl_CloseObjCmd},
{"copy", Tcl_FcopyObjCmd},
{"create", TclChanCreateObjCmd}, /* TIP #219 */
{"eof", Tcl_EofObjCmd},
{"event", Tcl_FileEventObjCmd},
{"flush", Tcl_FlushObjCmd},
{"gets", Tcl_GetsObjCmd},
{"pending", ChanPendingObjCmd}, /* TIP #287 */
{"postevent", TclChanPostEventObjCmd}, /* TIP #219 */
{"puts", Tcl_PutsObjCmd},
{"read", Tcl_ReadObjCmd},
{"seek", Tcl_SeekObjCmd},
{"tell", Tcl_TellObjCmd},
{"truncate", ChanTruncateObjCmd}, /* TIP #208 */
{NULL}
};
static const char *extras[] = {
"configure", "::fconfigure",
"names", "::file channels",
NULL
};
Tcl_Command ensemble;
Tcl_Obj *mapObj;
int i;
ensemble = TclMakeEnsemble(interp, "chan", initMap);
Tcl_GetEnsembleMappingDict(NULL, ensemble, &mapObj);
for (i=0 ; extras[i] ; i+=2) {
/*
* Can assume that reference counts are all incremented.
*/
Tcl_DictObjPut(NULL, mapObj, Tcl_NewStringObj(extras[i], -1),
Tcl_NewStringObj(extras[i+1], -1));
}
Tcl_SetEnsembleMappingDict(interp, ensemble, mapObj);
return ensemble;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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