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-rw-r--r--generic/tclIOCmd.c70
1 files changed, 69 insertions, 1 deletions
diff --git a/generic/tclIOCmd.c b/generic/tclIOCmd.c
index 4b5974b..c2c1bb8 100644
--- a/generic/tclIOCmd.c
+++ b/generic/tclIOCmd.c
@@ -8,7 +8,7 @@
* 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 1.34 2006/07/20 06:17:39 das Exp $
+ * RCS: @(#) $Id: tclIOCmd.c,v 1.35 2006/12/01 15:55:44 dgp Exp $
*/
#include "tclInt.h"
@@ -1619,6 +1619,74 @@ Tcl_FcopyObjCmd(
}
/*
+ *---------------------------------------------------------------------------
+ *
+ * TclChanPendingObjCmd --
+ *
+ * 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 */
+int
+TclChanPendingObjCmd(
+ 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;
+ char *arg;
+ static CONST char *options[] = {"input", "output", (char *) 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;
+ }
+
+ arg = Tcl_GetString(objv[2]);
+ chan = Tcl_GetChannel(interp, arg, &mode);
+ if (chan == NULL) {
+ 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)));
+ }
+ return TCL_OK;
+ case PENDING_OUTPUT:
+ if ((mode & TCL_WRITABLE) == 0) {
+ Tcl_SetObjResult(interp, Tcl_NewIntObj(-1));
+ } else {
+ Tcl_SetObjResult(interp, Tcl_NewIntObj(Tcl_OutputBuffered(chan)));
+ }
+ return TCL_OK;
+ }
+}
+
+/*
*----------------------------------------------------------------------
*
* Tcl_ChanTruncateObjCmd --