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-'\"
-'\" Copyright (c) 1989-1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1997 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_CreateCommand 3 "" Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_CreateCommand \- implement new commands in C
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-Tcl_Command
-\fBTcl_CreateCommand\fR(\fIinterp, cmdName, proc, clientData, deleteProc\fR)
-.SH ARGUMENTS
-.AS Tcl_CmdDeleteProc *deleteProc
-.AP Tcl_Interp *interp in
-Interpreter in which to create new command.
-.AP "const char" *cmdName in
-Name of command.
-.AP Tcl_CmdProc *proc in
-Implementation of new command:  \fIproc\fR will be called whenever
-\fIcmdName\fR is invoked as a command.
-.AP ClientData clientData in
-Arbitrary one-word value to pass to \fIproc\fR and \fIdeleteProc\fR.
-.AP Tcl_CmdDeleteProc *deleteProc in
-Procedure to call before \fIcmdName\fR is deleted from the interpreter;
-allows for command-specific cleanup.  If NULL, then no procedure is
-called before the command is deleted.
-.BE
-.SH DESCRIPTION
-.PP
-\fBTcl_CreateCommand\fR defines a new command in \fIinterp\fR and associates
-it with procedure \fIproc\fR such that whenever \fIcmdName\fR is
-invoked as a Tcl command (via a call to \fBTcl_Eval\fR) the Tcl interpreter
-will call \fIproc\fR to process the command.
-It differs from \fBTcl_CreateObjCommand\fR in that a new string-based
-command is defined;
-that is, a command procedure is defined that takes an array of
-argument strings instead of values.
-The value-based command procedures registered by \fBTcl_CreateObjCommand\fR
-can execute significantly faster than the string-based command procedures
-defined by \fBTcl_CreateCommand\fR.
-This is because they take Tcl values as arguments
-and those values can retain an internal representation that
-can be manipulated more efficiently.
-Also, Tcl's interpreter now uses values internally.
-In order to invoke a string-based command procedure
-registered by \fBTcl_CreateCommand\fR,
-it must generate and fetch a string representation
-from each argument value before the call.
-New commands should be defined using \fBTcl_CreateObjCommand\fR.
-We support \fBTcl_CreateCommand\fR for backwards compatibility.
-.PP
-The procedures \fBTcl_DeleteCommand\fR, \fBTcl_GetCommandInfo\fR,
-and \fBTcl_SetCommandInfo\fR are used in conjunction with
-\fBTcl_CreateCommand\fR.
-.PP
-\fBTcl_CreateCommand\fR will delete an existing command \fIcmdName\fR,
-if one is already associated with the interpreter.
-It returns a token that may be used to refer
-to the command in subsequent calls to \fBTcl_GetCommandName\fR.
-If \fIcmdName\fR contains any \fB::\fR namespace qualifiers,
-then the command is added to the specified namespace;
-otherwise the command is added to the global namespace.
-If \fBTcl_CreateCommand\fR is called for an interpreter that is in
-the process of being deleted, then it does not create a new command
-and it returns NULL.
-\fIProc\fR should have arguments and result that match the type
-\fBTcl_CmdProc\fR:
-.PP
-.CS
-typedef int \fBTcl_CmdProc\fR(
-        ClientData \fIclientData\fR,
-        Tcl_Interp *\fIinterp\fR,
-        int \fIargc\fR,
-        const char *\fIargv\fR[]);
-.CE
-.PP
-When \fIproc\fR is invoked the \fIclientData\fR and \fIinterp\fR
-parameters will be copies of the \fIclientData\fR and \fIinterp\fR
-arguments given to \fBTcl_CreateCommand\fR.
-Typically, \fIclientData\fR points to an application-specific
-data structure that describes what to do when the command procedure
-is invoked.  \fIArgc\fR and \fIargv\fR describe the arguments to
-the command, \fIargc\fR giving the number of arguments (including
-the command name) and \fIargv\fR giving the values of the arguments
-as strings.  The \fIargv\fR array will contain \fIargc\fR+1 values;
-the first \fIargc\fR values point to the argument strings, and the
-last value is NULL.
-Note that the argument strings should not be modified as they may
-point to constant strings or may be shared with other parts of the
-interpreter.
-.PP
-Note that the argument strings are encoded in normalized UTF-8 since
-version 8.1 of Tcl.
-.PP
-\fIProc\fR must return an integer code that is expected to be one of
-\fBTCL_OK\fR, \fBTCL_ERROR\fR, \fBTCL_RETURN\fR, \fBTCL_BREAK\fR, or
-\fBTCL_CONTINUE\fR.  See the Tcl overview man page
-for details on what these codes mean.  Most normal commands will only
-return \fBTCL_OK\fR or \fBTCL_ERROR\fR.  In addition, \fIproc\fR must set
-the interpreter result;
-in the case of a \fBTCL_OK\fR return code this gives the result
-of the command, and in the case of \fBTCL_ERROR\fR it gives an error message.
-The \fBTcl_SetResult\fR procedure provides an easy interface for setting
-the return value;  for complete details on how the interpreter result
-field is managed, see the \fBTcl_Interp\fR man page.
-Before invoking a command procedure,
-\fBTcl_Eval\fR sets the interpreter result to point to an empty string,
-so simple commands can return an empty result by doing nothing at all.
-.PP
-The contents of the \fIargv\fR array belong to Tcl and are not
-guaranteed to persist once \fIproc\fR returns:  \fIproc\fR should
-not modify them, nor should it set the interpreter result to point
-anywhere within the \fIargv\fR values.
-Call \fBTcl_SetResult\fR with status \fBTCL_VOLATILE\fR if you want
-to return something from the \fIargv\fR array.
-.PP
-\fIDeleteProc\fR will be invoked when (if) \fIcmdName\fR is deleted. This can
-occur through a call to \fBTcl_DeleteCommand\fR or \fBTcl_DeleteInterp\fR,
-or by replacing \fIcmdName\fR in another call to \fBTcl_CreateCommand\fR.
-\fIDeleteProc\fR is invoked before the command is deleted, and gives the
-application an opportunity to release any structures associated
-with the command.  \fIDeleteProc\fR should have arguments and
-result that match the type \fBTcl_CmdDeleteProc\fR:
-.PP
-.CS
-typedef void \fBTcl_CmdDeleteProc\fR(
-        ClientData \fIclientData\fR);
-.CE
-.PP
-The \fIclientData\fR argument will be the same as the \fIclientData\fR
-argument passed to \fBTcl_CreateCommand\fR.
-.SH "SEE ALSO"
-Tcl_CreateObjCommand, Tcl_DeleteCommand, Tcl_GetCommandInfo,
-Tcl_SetCommandInfo, Tcl_GetCommandName, Tcl_SetObjResult
-.SH KEYWORDS
-bind, command, create, delete, interpreter, namespace