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 * tcl.h --
 *    This header file describes the externally-visible facilities
 *    of the Tcl interpreter.
 * Copyright (c) 1987-1994 The Regents of the University of California.
 * Copyright (c) 1993-1996 Lucent Technologies.
 * Copyright (c) 1994-1998 Sun Microsystems, Inc.
 * Copyright (c) 1998-2000 by Scriptics Corporation.
 * Copyright (c) 2002 by Kevin B. Kenny.  All rights reserved.
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 * RCS: @(#) $Id: tcl.h,v 2004/04/02 22:33:47 joye Exp $

#ifndef _TCL
#define _TCL

 * For C++ compilers, use extern "C"

#ifdef __cplusplus
extern "C" {
 * The following defines are used to indicate the various release levels.

#define TCL_ALPHA_RELEASE     0
#define TCL_BETA_RELEASE      1
#define TCL_FINAL_RELEASE     2

 * When version numbers change here, must also go into the following files
 * and update the version numbers:
 * library/init.tcl     (only if Major.minor changes, not patchlevel) 1 LOC
 * unix/configure.in    (2 LOC Major, 2 LOC minor, 1 LOC patch)
 * win/configure.in     (as above)
 * win/tcl.m4           (not patchlevel)
 * win/makefile.vc      (not patchlevel) 2 LOC
 * README         (sections 0 and 2)
 * mac/README           (2 LOC, not patchlevel)
 * macosx/Tcl.pbproj/project.pbxproj (not patchlevel) 2 LOC
 * win/README.binary    (sections 0-4)
 * win/README           (not patchlevel) (sections 0 and 2)
 * unix/tcl.spec  (2 LOC Major/Minor, 1 LOC patch)
 * tests/basic.test     (1 LOC M/M, not patchlevel)
 * tools/tcl.hpj.in     (not patchlevel, for windows installer)
 * tools/tcl.wse.in     (for windows installer)
 * tools/tclSplash.bmp  (not patchlevel)

#define TCL_VERSION         "8.4"
#define TCL_PATCH_LEVEL     "8.4.6"

 * The following definitions set up the proper options for Windows
 * compilers.  We use this method because there is no autoconf equivalent.

#ifndef __WIN32__
#   if defined(_WIN32) || defined(WIN32) || defined(__MINGW32__) || defined(__BORLANDC__)
#     define __WIN32__
#     ifndef WIN32
#         define WIN32
#     endif
#   endif

 * STRICT: See MSDN Article Q83456
#ifdef __WIN32__
#   ifndef STRICT
#     define STRICT
#   endif
#endif /* __WIN32__ */

 * The following definitions set up the proper options for Macintosh
 * compilers.  We use this method because there is no autoconf equivalent.

#ifdef MAC_TCL
#include <ConditionalMacros.h>
#   ifndef USE_TCLALLOC
#     define USE_TCLALLOC 1
#   endif
#   ifndef NO_STRERROR
#     define NO_STRERROR 1
#   endif
#   define INLINE 

 * Utility macros: STRINGIFY takes an argument and wraps it in "" (double
 * quotation marks), JOIN joins two arguments.
#  define STRINGIFY(x) STRINGIFY1(x)
#  define STRINGIFY1(x) #x
#ifndef JOIN
#  define JOIN(a,b) JOIN1(a,b)
#  define JOIN1(a,b) a##b

 * A special definition used to allow this header file to be included
 * from windows or mac resource files so that they can obtain version
 * information.  RC_INVOKED is defined by default by the windows RC tool
 * and manually set for macintosh.
 * Resource compilers don't like all the C stuff, like typedefs and
 * procedure declarations, that occur below, so block them out.

#ifndef RC_INVOKED

 * Special macro to define mutexes, that doesn't do anything
 * if we are not using threads.

#define TCL_DECLARE_MUTEX(name) static Tcl_Mutex name;
#define TCL_DECLARE_MUTEX(name)

 * Macros that eliminate the overhead of the thread synchronization
 * functions when compiling without thread support.

#define Tcl_MutexLock(mutexPtr)
#define Tcl_MutexUnlock(mutexPtr)
#define Tcl_MutexFinalize(mutexPtr)
#define Tcl_ConditionNotify(condPtr)
#define Tcl_ConditionWait(condPtr, mutexPtr, timePtr)
#define Tcl_ConditionFinalize(condPtr)
#endif /* TCL_THREADS */

#ifndef BUFSIZ
#   include <stdio.h>

 * Definitions that allow Tcl functions with variable numbers of
 * arguments to be used with either varargs.h or stdarg.h.  TCL_VARARGS
 * is used in procedure prototypes.  TCL_VARARGS_DEF is used to declare
 * the arguments in a function definiton: it takes the type and name of
 * the first argument and supplies the appropriate argument declaration
 * string for use in the function definition.  TCL_VARARGS_START
 * initializes the va_list data structure and returns the first argument.
#if !defined(NO_STDARG)
#   include <stdarg.h>
#   define TCL_VARARGS(type, name) (type name, ...)
#   define TCL_VARARGS_DEF(type, name) (type name, ...)
#   define TCL_VARARGS_START(type, name, list) (va_start(list, name), name)
#   include <varargs.h>
#      define TCL_VARARGS(type, name) ()
#      define TCL_VARARGS_DEF(type, name) (va_alist)
#   define TCL_VARARGS_START(type, name, list) \
      (va_start(list), va_arg(list, type))

 * Macros used to declare a function to be exported by a DLL.
 * Used by Windows, maps to no-op declarations on non-Windows systems.
 * The default build on windows is for a DLL, which causes the DLLIMPORT
 * and DLLEXPORT macros to be nonempty. To build a static library, the
 * macro STATIC_BUILD should be defined.

#   define DLLIMPORT
#   define DLLEXPORT
#   if (defined(__WIN32__) && (defined(_MSC_VER) || (__BORLANDC__ >= 0x0550) || (defined(__GNUC__) && defined(__declspec)))) || (defined(MAC_TCL) && FUNCTION_DECLSPEC)
#     define DLLIMPORT __declspec(dllimport)
#     define DLLEXPORT __declspec(dllexport)
#   else
#     define DLLIMPORT
#     define DLLEXPORT
#   endif

 * These macros are used to control whether functions are being declared for
 * import or export.  If a function is being declared while it is being built
 * to be included in a shared library, then it should have the DLLEXPORT
 * storage class.  If is being declared for use by a module that is going to
 * link against the shared library, then it should have the DLLIMPORT storage
 * class.  If the symbol is beind declared for a static build or for use from a
 * stub library, then the storage class should be empty.
 * The convention is that a macro called BUILD_xxxx, where xxxx is the
 * name of a library we are building, is set on the compile line for sources
 * that are to be placed in the library.  When this macro is set, the
 * storage class will be set to DLLEXPORT.  At the end of the header file, the
 * storage class will be reset to DLLIMPORT.
#ifdef BUILD_tcl
#   ifdef USE_TCL_STUBS
#      define TCL_STORAGE_CLASS
#   else
#   endif

 * Definitions that allow this header file to be used either with or
 * without ANSI C features like function prototypes.
#undef _ANSI_ARGS_
#undef CONST
#ifndef INLINE
#   define INLINE

#ifndef NO_CONST
#   define CONST const
#   define CONST

#   define _ANSI_ARGS_(x)     x
#   define _ANSI_ARGS_(x)     ()

#      error define at most one of USE_NON_CONST and USE_COMPAT_CONST
#   endif
#   define CONST84
#   define CONST84_RETURN
#      define CONST84 
#      define CONST84_RETURN CONST
#   else
#      define CONST84 CONST
#      define CONST84_RETURN CONST
#   endif

 * Make sure EXTERN isn't defined elsewhere
#ifdef EXTERN
#   undef EXTERN
#endif /* EXTERN */

#ifdef __cplusplus
#   define EXTERN extern "C" TCL_STORAGE_CLASS
#   define EXTERN extern TCL_STORAGE_CLASS

 * The following code is copied from winnt.h.
 * If we don't replicate it here, then <windows.h> can't be included 
 * after tcl.h, since tcl.h also defines VOID.
 * This block is skipped under Cygwin and Mingw.
#if defined(__WIN32__) && !defined(HAVE_WINNT_IGNORE_VOID)
#ifndef VOID
#define VOID void
typedef char CHAR;
typedef short SHORT;
typedef long LONG;
#endif /* __WIN32__ && !HAVE_WINNT_IGNORE_VOID */

 * Macro to use instead of "void" for arguments that must have
 * type "void *" in ANSI C;  maps them to type "char *" in
 * non-ANSI systems.

#ifndef NO_VOID
#         define VOID void
#         define VOID char

 * Miscellaneous declarations.
#ifndef NULL
#   define NULL 0

#   ifndef NO_VOID
      typedef void *ClientData;
#   else
      typedef int *ClientData;
#   endif
#   define _CLIENTDATA

 * Define Tcl_WideInt to be a type that is (at least) 64-bits wide,
 * and define Tcl_WideUInt to be the unsigned variant of that type
 * (assuming that where we have one, we can have the other.)
 * Also defines the following macros:
 * TCL_WIDE_INT_IS_LONG - if wide ints are really longs (i.e. we're on
 *    a real 64-bit system.)
 * Tcl_WideAsLong - forgetful converter from wideInt to long.
 * Tcl_LongAsWide - sign-extending converter from long to wideInt.
 * Tcl_WideAsDouble - converter from wideInt to double.
 * Tcl_DoubleAsWide - converter from double to wideInt.
 * The following invariant should hold for any long value 'longVal':
 *    longVal == Tcl_WideAsLong(Tcl_LongAsWide(longVal))
 * Note on converting between Tcl_WideInt and strings.  This
 * implementation (in tclObj.c) depends on the functions strtoull()
 * and sprintf(...,"%" TCL_LL_MODIFIER "d",...).  TCL_LL_MODIFIER_SIZE
 * is the length of the modifier string, which is "ll" on most 32-bit
 * Unix systems.  It has to be split up like this to allow for the more
 * complex formats sometimes needed (e.g. in the format(n) command.)

#if !defined(TCL_WIDE_INT_TYPE)&&!defined(TCL_WIDE_INT_IS_LONG)
#   if defined(__CYGWIN__)
#      define TCL_WIDE_INT_TYPE long long
#      define TCL_LL_MODIFIER "L"
typedef struct stat     Tcl_StatBuf;
#      define TCL_LL_MODIFIER_SIZE  1
#   elif defined(__WIN32__)
#      define TCL_WIDE_INT_TYPE __int64
#      ifdef __BORLANDC__
typedef struct stati64 Tcl_StatBuf;
#         define TCL_LL_MODIFIER    "L"
#         define TCL_LL_MODIFIER_SIZE     1
#      else /* __BORLANDC__ */
typedef struct _stati64 Tcl_StatBuf;
#         define TCL_LL_MODIFIER    "I64"
#         define TCL_LL_MODIFIER_SIZE     3
#      endif /* __BORLANDC__ */
#   else /* __WIN32__ */
 * Don't know what platform it is and configure hasn't discovered what
 * is going on for us.  Try to guess...
#      ifdef NO_LIMITS_H
#       error please define either TCL_WIDE_INT_TYPE or TCL_WIDE_INT_IS_LONG
#      else /* !NO_LIMITS_H */
#       include <limits.h>
#       if (INT_MAX < LONG_MAX)
#          define TCL_WIDE_INT_IS_LONG    1
#       else
#          define TCL_WIDE_INT_TYPE long long
#         endif
#      endif /* NO_LIMITS_H */
#   endif /* __WIN32__ */
#   define TCL_WIDE_INT_TYPE  long
#endif /* TCL_WIDE_INT_IS_LONG */

typedef TCL_WIDE_INT_TYPE           Tcl_WideInt;
typedef unsigned TCL_WIDE_INT_TYPE  Tcl_WideUInt;

typedef struct stat     Tcl_StatBuf;
#   define Tcl_WideAsLong(val)            ((long)(val))
#   define Tcl_LongAsWide(val)            ((long)(val))
#   define Tcl_WideAsDouble(val)    ((double)((long)(val)))
#   define Tcl_DoubleAsWide(val)    ((long)((double)(val)))
#   ifndef TCL_LL_MODIFIER
#      define TCL_LL_MODIFIER       "l"
#      define TCL_LL_MODIFIER_SIZE  1
#   endif /* !TCL_LL_MODIFIER */
#else /* TCL_WIDE_INT_IS_LONG */
 * The next short section of defines are only done when not running on
 * Windows or some other strange platform.
#   ifndef TCL_LL_MODIFIER
#      ifdef HAVE_STRUCT_STAT64
typedef struct stat64   Tcl_StatBuf;
#      else
typedef struct stat     Tcl_StatBuf;
#      endif /* HAVE_STRUCT_STAT64 */
#      define TCL_LL_MODIFIER       "ll"
#      define TCL_LL_MODIFIER_SIZE  2
#   endif /* !TCL_LL_MODIFIER */
#   define Tcl_WideAsLong(val)            ((long)((Tcl_WideInt)(val)))
#   define Tcl_LongAsWide(val)            ((Tcl_WideInt)((long)(val)))
#   define Tcl_WideAsDouble(val)    ((double)((Tcl_WideInt)(val)))
#   define Tcl_DoubleAsWide(val)    ((Tcl_WideInt)((double)(val)))
#endif /* TCL_WIDE_INT_IS_LONG */

 * This flag controls whether binary compatability is maintained with
 * extensions built against a previous version of Tcl. This is true
 * by default.

 * Data structures defined opaquely in this module. The definitions below
 * just provide dummy types. A few fields are made visible in Tcl_Interp
 * structures, namely those used for returning a string result from
 * commands. Direct access to the result field is discouraged in Tcl 8.0.
 * The interpreter result is either an object or a string, and the two
 * values are kept consistent unless some C code sets interp->result
 * directly. Programmers should use either the procedure Tcl_GetObjResult()
 * or Tcl_GetStringResult() to read the interpreter's result. See the
 * SetResult man page for details.
 * Note: any change to the Tcl_Interp definition below must be mirrored
 * in the "real" definition in tclInt.h.
 * Note: Tcl_ObjCmdProc procedures do not directly set result and freeProc.
 * Instead, they set a Tcl_Obj member in the "real" structure that can be
 * accessed with Tcl_GetObjResult() and Tcl_SetObjResult().

typedef struct Tcl_Interp {
    char *result;       /* If the last command returned a string
                         * result, this points to it. */
    void (*freeProc) _ANSI_ARGS_((char *blockPtr));
                        /* Zero means the string result is
                         * statically allocated. TCL_DYNAMIC means
                         * it was allocated with ckalloc and should
                         * be freed with ckfree. Other values give
                         * the address of procedure to invoke to
                         * free the result. Tcl_Eval must free it
                         * before executing next command. */
    int errorLine;              /* When TCL_ERROR is returned, this gives
                                 * the line number within the command where
                                 * the error occurred (1 if first line). */
} Tcl_Interp;

typedef struct Tcl_AsyncHandler_ *Tcl_AsyncHandler;
typedef struct Tcl_Channel_ *Tcl_Channel;
typedef struct Tcl_Command_ *Tcl_Command;
typedef struct Tcl_Condition_ *Tcl_Condition;
typedef struct Tcl_EncodingState_ *Tcl_EncodingState;
typedef struct Tcl_Encoding_ *Tcl_Encoding;
typedef struct Tcl_Event Tcl_Event;
typedef struct Tcl_Mutex_ *Tcl_Mutex;
typedef struct Tcl_Pid_ *Tcl_Pid;
typedef struct Tcl_RegExp_ *Tcl_RegExp;
typedef struct Tcl_ThreadDataKey_ *Tcl_ThreadDataKey;
typedef struct Tcl_ThreadId_ *Tcl_ThreadId;
typedef struct Tcl_TimerToken_ *Tcl_TimerToken;
typedef struct Tcl_Trace_ *Tcl_Trace;
typedef struct Tcl_Var_ *Tcl_Var;
typedef struct Tcl_ChannelTypeVersion_ *Tcl_ChannelTypeVersion;
typedef struct Tcl_LoadHandle_ *Tcl_LoadHandle;

 * Definition of the interface to procedures implementing threads.
 * A procedure following this definition is given to each call of
 * 'Tcl_CreateThread' and will be called as the main fuction of
 * the new thread created by that call.
#ifdef MAC_TCL
typedef pascal void *(Tcl_ThreadCreateProc) _ANSI_ARGS_((ClientData clientData));
#elif defined __WIN32__
typedef unsigned (__stdcall Tcl_ThreadCreateProc) _ANSI_ARGS_((ClientData clientData));
typedef void (Tcl_ThreadCreateProc) _ANSI_ARGS_((ClientData clientData));

 * Threading function return types used for abstracting away platform
 * differences when writing a Tcl_ThreadCreateProc.  See the NewThread
 * function in generic/tclThreadTest.c for it's usage.
#ifdef MAC_TCL
#   define Tcl_ThreadCreateType           pascal void *
#elif defined __WIN32__
#   define Tcl_ThreadCreateType           unsigned __stdcall
#   define TCL_THREAD_CREATE_RETURN return 0
#   define Tcl_ThreadCreateType           void

 * Definition of values for default stacksize and the possible flags to be
 * given to Tcl_CreateThread.
#define TCL_THREAD_STACK_DEFAULT (0)    /* Use default size for stack */
#define TCL_THREAD_NOFLAGS       (0000) /* Standard flags, default behaviour */
#define TCL_THREAD_JOINABLE      (0001) /* Mark the thread as joinable */

 * Flag values passed to Tcl_GetRegExpFromObj.
#define     TCL_REG_BASIC           000000      /* BREs (convenience) */
#define     TCL_REG_EXTENDED  000001      /* EREs */
#define     TCL_REG_ADVF            000002      /* advanced features in EREs */
#define     TCL_REG_ADVANCED  000003      /* AREs (which are also EREs) */
#define     TCL_REG_QUOTE           000004      /* no special characters, none */
#define     TCL_REG_NOCASE          000010      /* ignore case */
#define     TCL_REG_NOSUB           000020      /* don't care about subexpressions */
#define     TCL_REG_EXPANDED  000040      /* expanded format, white space &
                               * comments */
#define     TCL_REG_NLSTOP          000100  /* \n doesn't match . or [^ ] */
#define     TCL_REG_NLANCH          000200  /* ^ matches after \n, $ before */
#define     TCL_REG_NEWLINE         000300  /* newlines are line terminators */
#define     TCL_REG_CANMATCH  001000  /* report details on partial/limited
                               * matches */

 * The following flag is experimental and only intended for use by Expect.  It
 * will probably go away in a later release.
#define TCL_REG_BOSONLY       002000      /* prepend \A to pattern so it only
                               * matches at the beginning of the
                               * string. */

 * Flags values passed to Tcl_RegExpExecObj.
#define     TCL_REG_NOTBOL    0001  /* Beginning of string does not match ^.  */
#define     TCL_REG_NOTEOL    0002  /* End of string does not match $. */

 * Structures filled in by Tcl_RegExpInfo.  Note that all offset values are
 * relative to the start of the match string, not the beginning of the
 * entire string.
typedef struct Tcl_RegExpIndices {
    long start;         /* character offset of first character in match */
    long end;           /* character offset of first character after the
                   * match. */
} Tcl_RegExpIndices;

typedef struct Tcl_RegExpInfo {
    int nsubs;                /* number of subexpressions in the
                         * compiled expression */
    Tcl_RegExpIndices *matches;     /* array of nsubs match offset
                         * pairs */
    long extendStart;         /* The offset at which a subsequent
                         * match might begin. */
    long reserved;            /* Reserved for later use. */
} Tcl_RegExpInfo;

 * Picky compilers complain if this typdef doesn't appear before the
 * struct's reference in tclDecls.h.
typedef Tcl_StatBuf *Tcl_Stat_;
typedef struct stat *Tcl_OldStat_;

 * When a TCL command returns, the interpreter contains a result from the
 * command. Programmers are strongly encouraged to use one of the
 * procedures Tcl_GetObjResult() or Tcl_GetStringResult() to read the
 * interpreter's result. See the SetResult man page for details. Besides
 * this result, the command procedure returns an integer code, which is 
 * one of the following:
 * TCL_OK         Command completed normally; the interpreter's
 *                result contains   the command's result.
 * TCL_ERROR            The command couldn't be completed successfully;
 *                the interpreter's result describes what went wrong.
 * TCL_RETURN           The command requests that the current procedure
 *                return; the interpreter's result contains the
 *                procedure's return value.
 * TCL_BREAK            The command requests that the innermost loop
 *                be exited; the interpreter's result is meaningless.
 * TCL_CONTINUE         Go on to the next iteration of the current loop;
 *                the interpreter's result is meaningless.
#define TCL_OK          0
#define TCL_ERROR 1
#define TCL_RETURN      2
#define TCL_BREAK 3
#define TCL_CONTINUE    4

#define TCL_RESULT_SIZE 200

 * Flags to control what substitutions are performed by Tcl_SubstObj():
#define TCL_SUBST_COMMANDS    001
#define TCL_SUBST_ALL         007

 * Argument descriptors for math function callbacks in expressions:
typedef enum {
} Tcl_ValueType;
typedef struct Tcl_Value {
    Tcl_ValueType type;       /* Indicates intValue or doubleValue is
                         * valid, or both. */
    long intValue;            /* Integer value. */
    double doubleValue;       /* Double-precision floating value. */
    Tcl_WideInt wideValue;    /* Wide (min. 64-bit) integer value. */
} Tcl_Value;

 * Forward declaration of Tcl_Obj to prevent an error when the forward
 * reference to Tcl_Obj is encountered in the procedure types declared 
 * below.
struct Tcl_Obj;

 * Procedure types defined by Tcl:

typedef int (Tcl_AppInitProc) _ANSI_ARGS_((Tcl_Interp *interp));
typedef int (Tcl_AsyncProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp, int code));
typedef void (Tcl_ChannelProc) _ANSI_ARGS_((ClientData clientData, int mask));
typedef void (Tcl_CloseProc) _ANSI_ARGS_((ClientData data));
typedef void (Tcl_CmdDeleteProc) _ANSI_ARGS_((ClientData clientData));
typedef int (Tcl_CmdProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp, int argc, CONST84 char *argv[]));
typedef void (Tcl_CmdTraceProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp, int level, char *command, Tcl_CmdProc *proc,
      ClientData cmdClientData, int argc, CONST84 char *argv[]));
typedef int (Tcl_CmdObjTraceProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp, int level, CONST char *command,
      Tcl_Command commandInfo, int objc, struct Tcl_Obj * CONST * objv));
typedef void (Tcl_CmdObjTraceDeleteProc) _ANSI_ARGS_((ClientData clientData));
typedef void (Tcl_DupInternalRepProc) _ANSI_ARGS_((struct Tcl_Obj *srcPtr, 
        struct Tcl_Obj *dupPtr));
typedef int (Tcl_EncodingConvertProc)_ANSI_ARGS_((ClientData clientData,
      CONST char *src, int srcLen, int flags, Tcl_EncodingState *statePtr,
      char *dst, int dstLen, int *srcReadPtr, int *dstWrotePtr,
      int *dstCharsPtr));
typedef void (Tcl_EncodingFreeProc)_ANSI_ARGS_((ClientData clientData));
typedef int (Tcl_EventProc) _ANSI_ARGS_((Tcl_Event *evPtr, int flags));
typedef void (Tcl_EventCheckProc) _ANSI_ARGS_((ClientData clientData,
      int flags));
typedef int (Tcl_EventDeleteProc) _ANSI_ARGS_((Tcl_Event *evPtr,
        ClientData clientData));
typedef void (Tcl_EventSetupProc) _ANSI_ARGS_((ClientData clientData,
      int flags));
typedef void (Tcl_ExitProc) _ANSI_ARGS_((ClientData clientData));
typedef void (Tcl_FileProc) _ANSI_ARGS_((ClientData clientData, int mask));
typedef void (Tcl_FileFreeProc) _ANSI_ARGS_((ClientData clientData));
typedef void (Tcl_FreeInternalRepProc) _ANSI_ARGS_((struct Tcl_Obj *objPtr));
typedef void (Tcl_FreeProc) _ANSI_ARGS_((char *blockPtr));
typedef void (Tcl_IdleProc) _ANSI_ARGS_((ClientData clientData));
typedef void (Tcl_InterpDeleteProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp));
typedef int (Tcl_MathProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp, Tcl_Value *args, Tcl_Value *resultPtr));
typedef void (Tcl_NamespaceDeleteProc) _ANSI_ARGS_((ClientData clientData));
typedef int (Tcl_ObjCmdProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp, int objc, struct Tcl_Obj * CONST * objv));
typedef int (Tcl_PackageInitProc) _ANSI_ARGS_((Tcl_Interp *interp));
typedef void (Tcl_PanicProc) _ANSI_ARGS_(TCL_VARARGS(CONST char *, format));
typedef void (Tcl_TcpAcceptProc) _ANSI_ARGS_((ClientData callbackData,
        Tcl_Channel chan, char *address, int port));
typedef void (Tcl_TimerProc) _ANSI_ARGS_((ClientData clientData));
typedef int (Tcl_SetFromAnyProc) _ANSI_ARGS_((Tcl_Interp *interp,
      struct Tcl_Obj *objPtr));
typedef void (Tcl_UpdateStringProc) _ANSI_ARGS_((struct Tcl_Obj *objPtr));
typedef char *(Tcl_VarTraceProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp, CONST84 char *part1, CONST84 char *part2, int flags));
typedef void (Tcl_CommandTraceProc) _ANSI_ARGS_((ClientData clientData,
      Tcl_Interp *interp, CONST char *oldName, CONST char *newName,
      int flags));
typedef void (Tcl_CreateFileHandlerProc) _ANSI_ARGS_((int fd, int mask,
      Tcl_FileProc *proc, ClientData clientData));
typedef void (Tcl_DeleteFileHandlerProc) _ANSI_ARGS_((int fd));
typedef void (Tcl_AlertNotifierProc) _ANSI_ARGS_((ClientData clientData));
typedef void (Tcl_ServiceModeHookProc) _ANSI_ARGS_((int mode));
typedef ClientData (Tcl_InitNotifierProc) _ANSI_ARGS_((VOID));
typedef void (Tcl_FinalizeNotifierProc) _ANSI_ARGS_((ClientData clientData));
typedef void (Tcl_MainLoopProc) _ANSI_ARGS_((void));

 * The following structure represents a type of object, which is a
 * particular internal representation for an object plus a set of
 * procedures that provide standard operations on objects of that type.

typedef struct Tcl_ObjType {
    char *name;               /* Name of the type, e.g. "int". */
    Tcl_FreeInternalRepProc *freeIntRepProc;
                        /* Called to free any storage for the type's
                         * internal rep. NULL if the internal rep
                         * does not need freeing. */
    Tcl_DupInternalRepProc *dupIntRepProc;
                        /* Called to create a new object as a copy
                         * of an existing object. */
    Tcl_UpdateStringProc *updateStringProc;
                        /* Called to update the string rep from the
                         * type's internal representation. */
    Tcl_SetFromAnyProc *setFromAnyProc;
                        /* Called to convert the object's internal
                         * rep to this type. Frees the internal rep
                         * of the old type. Returns TCL_ERROR on
                         * failure. */
} Tcl_ObjType;

 * One of the following structures exists for each object in the Tcl
 * system. An object stores a value as either a string, some internal
 * representation, or both.

typedef struct Tcl_Obj {
    int refCount;       /* When 0 the object will be freed. */
    char *bytes;        /* This points to the first byte of the
                         * object's string representation. The array
                         * must be followed by a null byte (i.e., at
                         * offset length) but may also contain
                         * embedded null characters. The array's
                         * storage is allocated by ckalloc. NULL
                         * means the string rep is invalid and must
                         * be regenerated from the internal rep.
                         * Clients should use Tcl_GetStringFromObj
                         * or Tcl_GetString to get a pointer to the
                         * byte array as a readonly value. */
    int length;               /* The number of bytes at *bytes, not
                         * including the terminating null. */
    Tcl_ObjType *typePtr;     /* Denotes the object's type. Always
                         * corresponds to the type of the object's
                         * internal rep. NULL indicates the object
                         * has no internal rep (has no type). */
    union {             /* The internal representation: */
      long longValue;         /*   - an long integer value */
      double doubleValue;     /*   - a double-precision floating value */
      VOID *otherValuePtr;    /*   - another, type-specific value */
      Tcl_WideInt wideValue;  /*   - a long long value */
      struct {          /*   - internal rep as two pointers */
          VOID *ptr1;
          VOID *ptr2;
      } twoPtrValue;
    } internalRep;
} Tcl_Obj;

 * Macros to increment and decrement a Tcl_Obj's reference count, and to
 * test whether an object is shared (i.e. has reference count > 1).
 * Note: clients should use Tcl_DecrRefCount() when they are finished using
 * an object, and should never call TclFreeObj() directly. TclFreeObj() is
 * only defined and made public in tcl.h to support Tcl_DecrRefCount's macro
 * definition. Note also that Tcl_DecrRefCount() refers to the parameter
 * "obj" twice. This means that you should avoid calling it with an
 * expression that is expensive to compute or has side effects.
void        Tcl_IncrRefCount _ANSI_ARGS_((Tcl_Obj *objPtr));
void        Tcl_DecrRefCount _ANSI_ARGS_((Tcl_Obj *objPtr));
int         Tcl_IsShared _ANSI_ARGS_((Tcl_Obj *objPtr));

#   define Tcl_IncrRefCount(objPtr) \
      Tcl_DbIncrRefCount(objPtr, __FILE__, __LINE__)
#   define Tcl_DecrRefCount(objPtr) \
      Tcl_DbDecrRefCount(objPtr, __FILE__, __LINE__)
#   define Tcl_IsShared(objPtr) \
      Tcl_DbIsShared(objPtr, __FILE__, __LINE__)
#   define Tcl_IncrRefCount(objPtr) \
#   define Tcl_DecrRefCount(objPtr) \
      if (--(objPtr)->refCount <= 0) TclFreeObj(objPtr)
#   define Tcl_IsShared(objPtr) \
      ((objPtr)->refCount > 1)

 * Macros and definitions that help to debug the use of Tcl objects.
 * When TCL_MEM_DEBUG is defined, the Tcl_New declarations are 
 * overridden to call debugging versions of the object creation procedures.

#  define Tcl_NewBooleanObj(val) \
     Tcl_DbNewBooleanObj(val, __FILE__, __LINE__)
#  define Tcl_NewByteArrayObj(bytes, len) \
     Tcl_DbNewByteArrayObj(bytes, len, __FILE__, __LINE__)
#  define Tcl_NewDoubleObj(val) \
     Tcl_DbNewDoubleObj(val, __FILE__, __LINE__)
#  define Tcl_NewIntObj(val) \
     Tcl_DbNewLongObj(val, __FILE__, __LINE__)
#  define Tcl_NewListObj(objc, objv) \
     Tcl_DbNewListObj(objc, objv, __FILE__, __LINE__)
#  define Tcl_NewLongObj(val) \
     Tcl_DbNewLongObj(val, __FILE__, __LINE__)
#  define Tcl_NewObj() \
     Tcl_DbNewObj(__FILE__, __LINE__)
#  define Tcl_NewStringObj(bytes, len) \
     Tcl_DbNewStringObj(bytes, len, __FILE__, __LINE__)
#  define Tcl_NewWideIntObj(val) \
     Tcl_DbNewWideIntObj(val, __FILE__, __LINE__)
#endif /* TCL_MEM_DEBUG */

 * The following structure contains the state needed by
 * Tcl_SaveResult.  No-one outside of Tcl should access any of these
 * fields.  This structure is typically allocated on the stack.
typedef struct Tcl_SavedResult {
    char *result;
    Tcl_FreeProc *freeProc;
    Tcl_Obj *objResultPtr;
    char *appendResult;
    int appendAvl;
    int appendUsed;
    char resultSpace[TCL_RESULT_SIZE+1];
} Tcl_SavedResult;

 * The following definitions support Tcl's namespace facility.
 * Note: the first five fields must match exactly the fields in a
 * Namespace structure (see tclInt.h). 

typedef struct Tcl_Namespace {
    char *name;                 /* The namespace's name within its parent
                         * namespace. This contains no ::'s. The
                         * name of the global namespace is ""
                         * although "::" is an synonym. */
    char *fullName;             /* The namespace's fully qualified name.
                         * This starts with ::. */
    ClientData clientData;      /* Arbitrary value associated with this
                         * namespace. */
    Tcl_NamespaceDeleteProc* deleteProc;
                                /* Procedure invoked when deleting the
                         * namespace to, e.g., free clientData. */
    struct Tcl_Namespace* parentPtr;
                                /* Points to the namespace that contains
                         * this one. NULL if this is the global
                         * namespace. */
} Tcl_Namespace;

 * The following structure represents a call frame, or activation record.
 * A call frame defines a naming context for a procedure call: its local
 * scope (for local variables) and its namespace scope (used for non-local
 * variables; often the global :: namespace). A call frame can also define
 * the naming context for a namespace eval or namespace inscope command:
 * the namespace in which the command's code should execute. The
 * Tcl_CallFrame structures exist only while procedures or namespace
 * eval/inscope's are being executed, and provide a Tcl call stack.
 * A call frame is initialized and pushed using Tcl_PushCallFrame and
 * popped using Tcl_PopCallFrame. Storage for a Tcl_CallFrame must be
 * provided by the Tcl_PushCallFrame caller, and callers typically allocate
 * them on the C call stack for efficiency. For this reason, Tcl_CallFrame
 * is defined as a structure and not as an opaque token. However, most
 * Tcl_CallFrame fields are hidden since applications should not access
 * them directly; others are declared as "dummyX".
 * WARNING!! The structure definition must be kept consistent with the
 * CallFrame structure in tclInt.h. If you change one, change the other.

typedef struct Tcl_CallFrame {
    Tcl_Namespace *nsPtr;
    int dummy1;
    int dummy2;
    char *dummy3;
    char *dummy4;
    char *dummy5;
    int dummy6;
    char *dummy7;
    char *dummy8;
    int dummy9;
    char* dummy10;
} Tcl_CallFrame;

 * Information about commands that is returned by Tcl_GetCommandInfo and
 * passed to Tcl_SetCommandInfo. objProc is an objc/objv object-based
 * command procedure while proc is a traditional Tcl argc/argv
 * string-based procedure. Tcl_CreateObjCommand and Tcl_CreateCommand
 * ensure that both objProc and proc are non-NULL and can be called to
 * execute the command. However, it may be faster to call one instead of
 * the other. The member isNativeObjectProc is set to 1 if an
 * object-based procedure was registered by Tcl_CreateObjCommand, and to
 * 0 if a string-based procedure was registered by Tcl_CreateCommand.
 * The other procedure is typically set to a compatibility wrapper that
 * does string-to-object or object-to-string argument conversions then
 * calls the other procedure.

typedef struct Tcl_CmdInfo {
    int isNativeObjectProc;    /* 1 if objProc was registered by a call to
                          * Tcl_CreateObjCommand; 0 otherwise.
                          * Tcl_SetCmdInfo does not modify this
                          * field. */
    Tcl_ObjCmdProc *objProc;   /* Command's object-based procedure. */
    ClientData objClientData;  /* ClientData for object proc. */
    Tcl_CmdProc *proc;         /* Command's string-based procedure. */
    ClientData clientData;     /* ClientData for string proc. */
    Tcl_CmdDeleteProc *deleteProc;
                                 /* Procedure to call when command is
                                  * deleted. */
    ClientData deleteData;     /* Value to pass to deleteProc (usually
                          * the same as clientData). */
    Tcl_Namespace *namespacePtr; /* Points to the namespace that contains
                          * this command. Note that Tcl_SetCmdInfo
                          * will not change a command's namespace;
                          * use Tcl_RenameCommand to do that. */

} Tcl_CmdInfo;

 * The structure defined below is used to hold dynamic strings.  The only
 * field that clients should use is the string field, accessible via the
 * macro Tcl_DStringValue.  
typedef struct Tcl_DString {
    char *string;       /* Points to beginning of string:  either
                         * staticSpace below or a malloced array. */
    int length;               /* Number of non-NULL characters in the
                         * string. */
    int spaceAvl;       /* Total number of bytes available for the
                         * string and its terminating NULL char. */
    char staticSpace[TCL_DSTRING_STATIC_SIZE];
                        /* Space to use in common case where string
                         * is small. */
} Tcl_DString;

#define Tcl_DStringLength(dsPtr) ((dsPtr)->length)
#define Tcl_DStringValue(dsPtr) ((dsPtr)->string)
#define Tcl_DStringTrunc Tcl_DStringSetLength

 * Definitions for the maximum number of digits of precision that may
 * be specified in the "tcl_precision" variable, and the number of
 * bytes of buffer space required by Tcl_PrintDouble.
#define TCL_MAX_PREC 17

 * Definition for a number of bytes of buffer space sufficient to hold the
 * string representation of an integer in base 10 (assuming the existence
 * of 64-bit integers).
#define TCL_INTEGER_SPACE     24

 * Flag that may be passed to Tcl_ConvertElement to force it not to
 * output braces (careful!  if you change this flag be sure to change
 * the definitions at the front of tclUtil.c).

 * Flag that may be passed to Tcl_GetIndexFromObj to force it to disallow
 * abbreviated strings.
#define TCL_EXACT 1

 * Flag values passed to Tcl_RecordAndEval and/or Tcl_EvalObj.
 * WARNING: these bit choices must not conflict with the bit choices
 * for evalFlag bits in tclInt.h!!
#define TCL_NO_EVAL           0x10000
#define TCL_EVAL_GLOBAL       0x20000
#define TCL_EVAL_DIRECT       0x40000
#define TCL_EVAL_INVOKE         0x80000

 * Special freeProc values that may be passed to Tcl_SetResult (see
 * the man page for details):
#define TCL_VOLATILE    ((Tcl_FreeProc *) 1)
#define TCL_STATIC      ((Tcl_FreeProc *) 0)
#define TCL_DYNAMIC     ((Tcl_FreeProc *) 3)

 * Flag values passed to variable-related procedures.
#define TCL_GLOBAL_ONLY        1
#define TCL_NAMESPACE_ONLY     2
#define TCL_APPEND_VALUE       4
#define TCL_LIST_ELEMENT       8
#define TCL_TRACE_READS        0x10
#define TCL_TRACE_WRITES       0x20
#define TCL_TRACE_UNSETS       0x40
#define TCL_TRACE_DESTROYED    0x80
#define TCL_INTERP_DESTROYED   0x100
#define TCL_LEAVE_ERR_MSG      0x200
#define TCL_TRACE_ARRAY        0x800
/* Required to support old variable/vdelete/vinfo traces */
#define TCL_TRACE_OLD_STYLE    0x1000
/* Indicate the semantics of the result of a trace */
#define TCL_TRACE_RESULT_OBJECT  0x10000

 * Flag values passed to command-related procedures.

#define TCL_TRACE_RENAME 0x2000
#define TCL_TRACE_DELETE 0x4000


 * Flag values passed to Tcl_CreateObjTrace, and used internally
 * by command execution traces.  Slots 4,8,16 and 32 are
 * used internally by execution traces (see tclCmdMZ.c)
#define TCL_TRACE_ENTER_EXEC        1
#define TCL_TRACE_LEAVE_EXEC        2

 * The TCL_PARSE_PART1 flag is deprecated and has no effect. 
 * The part1 is now always parsed whenever the part2 is NULL.
 * (This is to avoid a common error when converting code to
 *  use the new object based APIs and forgetting to give the
 *  flag)
#   define TCL_PARSE_PART1      0x400

 * Types for linked variables:
#define TCL_LINK_INT          1
#define TCL_LINK_DOUBLE       2
#define TCL_LINK_BOOLEAN      3
#define TCL_LINK_STRING       4
#define TCL_LINK_WIDE_INT     5
#define TCL_LINK_READ_ONLY    0x80

 * Forward declarations of Tcl_HashTable and related types.
typedef struct Tcl_HashKeyType Tcl_HashKeyType;
typedef struct Tcl_HashTable Tcl_HashTable;
typedef struct Tcl_HashEntry Tcl_HashEntry;

typedef unsigned int (Tcl_HashKeyProc) _ANSI_ARGS_((Tcl_HashTable *tablePtr,
      VOID *keyPtr));
typedef int (Tcl_CompareHashKeysProc) _ANSI_ARGS_((VOID *keyPtr,
      Tcl_HashEntry *hPtr));
typedef Tcl_HashEntry *(Tcl_AllocHashEntryProc) _ANSI_ARGS_((
      Tcl_HashTable *tablePtr, VOID *keyPtr));
typedef void (Tcl_FreeHashEntryProc) _ANSI_ARGS_((Tcl_HashEntry *hPtr));

 * This flag controls whether the hash table stores the hash of a key, or
 * recalculates it. There should be no reason for turning this flag off
 * as it is completely binary and source compatible unless you directly
 * access the bucketPtr member of the Tcl_HashTableEntry structure. This
 * member has been removed and the space used to store the hash value.

 * Structure definition for an entry in a hash table.  No-one outside
 * Tcl should access any of these fields directly;  use the macros
 * defined below.

struct Tcl_HashEntry {
    Tcl_HashEntry *nextPtr;         /* Pointer to next entry in this
                               * hash bucket, or NULL for end of
                               * chain. */
    Tcl_HashTable *tablePtr;        /* Pointer to table containing entry. */
    VOID *hash;                     /* Hash value, stored as pointer to
                               * ensure that the offsets of the
                               * fields in this structure are not
                               * changed. */
#   else
    unsigned int hash;              /* Hash value. */
#   endif
    Tcl_HashEntry **bucketPtr;            /* Pointer to bucket that points to
                               * first entry in this entry's chain:
                               * used for deleting the entry. */
    ClientData clientData;          /* Application stores something here
                               * with Tcl_SetHashValue. */
    union {                   /* Key has one of these forms: */
      char *oneWordValue;           /* One-word value for key. */
        Tcl_Obj *objPtr;            /* Tcl_Obj * key value. */
      int words[1];                 /* Multiple integer words for key.
                               * The actual size will be as large
                               * as necessary for this table's
                               * keys. */
      char string[4];               /* String for key.  The actual size
                               * will be as large as needed to hold
                               * the key. */
    } key;                    /* MUST BE LAST FIELD IN RECORD!! */

 * Flags used in Tcl_HashKeyType.
 *                      There are some things, pointers for example
 *                      which don't hash well because they do not use
 *                      the lower bits. If this flag is set then the
 *                      hash table will attempt to rectify this by
 *                      randomising the bits and then using the upper
 *                      N bits as the index into the table.

 * Structure definition for the methods associated with a hash table
 * key type.
struct Tcl_HashKeyType {
    int version;        /* Version of the table. If this structure is
                         * extended in future then the version can be
                         * used to distinguish between different
                         * structures. 

    int flags;                /* Flags, see above for details. */

    /* Calculates a hash value for the key. If this is NULL then the pointer
     * itself is used as a hash value.
    Tcl_HashKeyProc *hashKeyProc;

    /* Compares two keys and returns zero if they do not match, and non-zero
     * if they do. If this is NULL then the pointers are compared.
    Tcl_CompareHashKeysProc *compareKeysProc;

    /* Called to allocate memory for a new entry, i.e. if the key is a
     * string then this could allocate a single block which contains enough
     * space for both the entry and the string. Only the key field of the
     * allocated Tcl_HashEntry structure needs to be filled in. If something
     * else needs to be done to the key, i.e. incrementing a reference count
     * then that should be done by this function. If this is NULL then Tcl_Alloc
     * is used to allocate enough space for a Tcl_HashEntry and the key pointer
     * is assigned to key.oneWordValue.
    Tcl_AllocHashEntryProc *allocEntryProc;

    /* Called to free memory associated with an entry. If something else needs
     * to be done to the key, i.e. decrementing a reference count then that
     * should be done by this function. If this is NULL then Tcl_Free is used
     * to free the Tcl_HashEntry.
    Tcl_FreeHashEntryProc *freeEntryProc;

 * Structure definition for a hash table.  Must be in tcl.h so clients
 * can allocate space for these structures, but clients should never
 * access any fields in this structure.

struct Tcl_HashTable {
    Tcl_HashEntry **buckets;        /* Pointer to bucket array.  Each
                               * element points to first entry in
                               * bucket's hash chain, or NULL. */
    Tcl_HashEntry *staticBuckets[TCL_SMALL_HASH_TABLE];
                              /* Bucket array used for small tables
                               * (to avoid mallocs and frees). */
    int numBuckets;                 /* Total number of buckets allocated
                               * at **bucketPtr. */
    int numEntries;                 /* Total number of entries present
                               * in table. */
    int rebuildSize;                /* Enlarge table when numEntries gets
                               * to be this large. */
    int downShift;                  /* Shift count used in hashing
                               * function.  Designed to use high-
                               * order bits of randomized keys. */
    int mask;                       /* Mask value used in hashing
                               * function. */
    int keyType;              /* Type of keys used in this table. 
                               * It's either TCL_CUSTOM_KEYS,
                               * TCL_STRING_KEYS, TCL_ONE_WORD_KEYS,
                               * or an integer giving the number of
                               * ints that is the size of the key.
    Tcl_HashEntry *(*findProc) _ANSI_ARGS_((Tcl_HashTable *tablePtr,
          CONST char *key));
    Tcl_HashEntry *(*createProc) _ANSI_ARGS_((Tcl_HashTable *tablePtr,
          CONST char *key, int *newPtr));
    Tcl_HashKeyType *typePtr;       /* Type of the keys used in the
                               * Tcl_HashTable. */

 * Structure definition for information used to keep track of searches
 * through hash tables:

typedef struct Tcl_HashSearch {
    Tcl_HashTable *tablePtr;        /* Table being searched. */
    int nextIndex;                  /* Index of next bucket to be
                               * enumerated after present one. */
    Tcl_HashEntry *nextEntryPtr;    /* Next entry to be enumerated in the
                               * the current bucket. */
} Tcl_HashSearch;

 * Acceptable key types for hash tables:
 * TCL_STRING_KEYS:           The keys are strings, they are copied into
 *                      the entry.
 * TCL_ONE_WORD_KEYS:         The keys are pointers, the pointer is stored
 *                      in the entry.
 * TCL_CUSTOM_TYPE_KEYS:      The keys are arbitrary types which are copied
 *                      into the entry.
 * TCL_CUSTOM_PTR_KEYS:       The keys are pointers to arbitrary types, the
 *                      pointer is stored in the entry.
 * While maintaining binary compatability the above have to be distinct
 * values as they are used to differentiate between old versions of the
 * hash table which don't have a typePtr and new ones which do. Once binary
 * compatability is discarded in favour of making more wide spread changes
 * TCL_STRING_KEYS can be the same as TCL_CUSTOM_TYPE_KEYS, and
 * TCL_ONE_WORD_KEYS can be the same as TCL_CUSTOM_PTR_KEYS because they
 * simply determine how the key is accessed from the entry and not the
 * behaviour.

#define TCL_STRING_KEYS       0
#define TCL_ONE_WORD_KEYS     1

#   define TCL_CUSTOM_TYPE_KEYS           -2
#   define TCL_CUSTOM_PTR_KEYS            -1

 * Macros for clients to use to access fields of hash entries:

#define Tcl_GetHashValue(h) ((h)->clientData)
#define Tcl_SetHashValue(h, value) ((h)->clientData = (ClientData) (value))
#   define Tcl_GetHashKey(tablePtr, h) \
      ((char *) (((tablePtr)->keyType == TCL_ONE_WORD_KEYS || \
                (tablePtr)->keyType == TCL_CUSTOM_PTR_KEYS) \
               ? (h)->key.oneWordValue \
               : (h)->key.string))
#   define Tcl_GetHashKey(tablePtr, h) \
      ((char *) (((tablePtr)->keyType == TCL_ONE_WORD_KEYS) \
               ? (h)->key.oneWordValue \
               : (h)->key.string))

 * Macros to use for clients to use to invoke find and create procedures
 * for hash tables:

#   define Tcl_FindHashEntry(tablePtr, key) \
      (*((tablePtr)->findProc))(tablePtr, key)
#   define Tcl_CreateHashEntry(tablePtr, key, newPtr) \
      (*((tablePtr)->createProc))(tablePtr, key, newPtr)
 * Macro to use new extended version of Tcl_InitHashTable.
#   define Tcl_InitHashTable(tablePtr, keyType) \
      Tcl_InitHashTableEx(tablePtr, keyType, NULL)

 * Flag values to pass to Tcl_DoOneEvent to disable searches
 * for some kinds of events:
#define TCL_DONT_WAIT         (1<<1)
#define TCL_WINDOW_EVENTS     (1<<2)
#define TCL_FILE_EVENTS       (1<<3)
#define TCL_TIMER_EVENTS      (1<<4)
#define TCL_IDLE_EVENTS       (1<<5)      /* WAS 0x10 ???? */
#define TCL_ALL_EVENTS        (~TCL_DONT_WAIT)

 * The following structure defines a generic event for the Tcl event
 * system.  These are the things that are queued in calls to Tcl_QueueEvent
 * and serviced later by Tcl_DoOneEvent.  There can be many different
 * kinds of events with different fields, corresponding to window events,
 * timer events, etc.  The structure for a particular event consists of
 * a Tcl_Event header followed by additional information specific to that
 * event.
struct Tcl_Event {
    Tcl_EventProc *proc;      /* Procedure to call to service this event. */
    struct Tcl_Event *nextPtr;      /* Next in list of pending events, or NULL. */

 * Positions to pass to Tcl_QueueEvent:
typedef enum {
} Tcl_QueuePosition;

 * Values to pass to Tcl_SetServiceMode to specify the behavior of notifier
 * event routines.

 * The following structure keeps is used to hold a time value, either as
 * an absolute time (the number of seconds from the epoch) or as an
 * elapsed time. On Unix systems the epoch is Midnight Jan 1, 1970 GMT.
 * On Macintosh systems the epoch is Midnight Jan 1, 1904 GMT.
typedef struct Tcl_Time {
    long sec;                 /* Seconds. */
    long usec;                /* Microseconds. */
} Tcl_Time;

typedef void (Tcl_SetTimerProc) _ANSI_ARGS_((Tcl_Time *timePtr));
typedef int (Tcl_WaitForEventProc) _ANSI_ARGS_((Tcl_Time *timePtr));

 * Bits to pass to Tcl_CreateFileHandler and Tcl_CreateChannelHandler
 * to indicate what sorts of events are of interest:
#define TCL_READABLE    (1<<1)
#define TCL_WRITABLE    (1<<2)
#define TCL_EXCEPTION   (1<<3)

 * Flag values to pass to Tcl_OpenCommandChannel to indicate the
 * disposition of the stdio handles.  TCL_STDIN, TCL_STDOUT, TCL_STDERR,
 * are also used in Tcl_GetStdChannel.
#define TCL_STDIN       (1<<1)      
#define TCL_STDOUT            (1<<2)
#define TCL_STDERR            (1<<3)
#define TCL_ENFORCE_MODE      (1<<4)

 * Bits passed to Tcl_DriverClose2Proc to indicate which side of a channel
 * should be closed.
#define TCL_CLOSE_READ        (1<<1)
#define TCL_CLOSE_WRITE (1<<2)

 * Value to use as the closeProc for a channel that supports the
 * close2Proc interface.
#define TCL_CLOSE2PROC  ((Tcl_DriverCloseProc *)1)

 * Channel version tag.  This was introduced in 8.3.2/8.4.
#define TCL_CHANNEL_VERSION_1 ((Tcl_ChannelTypeVersion) 0x1)
#define TCL_CHANNEL_VERSION_2 ((Tcl_ChannelTypeVersion) 0x2)
#define TCL_CHANNEL_VERSION_3 ((Tcl_ChannelTypeVersion) 0x3)

 * Typedefs for the various operations in a channel type:
typedef int (Tcl_DriverBlockModeProc) _ANSI_ARGS_((
                ClientData instanceData, int mode));
typedef int (Tcl_DriverCloseProc) _ANSI_ARGS_((ClientData instanceData,
                Tcl_Interp *interp));
typedef int (Tcl_DriverClose2Proc) _ANSI_ARGS_((ClientData instanceData,
                Tcl_Interp *interp, int flags));
typedef int (Tcl_DriverInputProc) _ANSI_ARGS_((ClientData instanceData,
                char *buf, int toRead, int *errorCodePtr));
typedef int (Tcl_DriverOutputProc) _ANSI_ARGS_((ClientData instanceData,
                CONST84 char *buf, int toWrite, int *errorCodePtr));
typedef int (Tcl_DriverSeekProc) _ANSI_ARGS_((ClientData instanceData,
                long offset, int mode, int *errorCodePtr));
typedef int (Tcl_DriverSetOptionProc) _ANSI_ARGS_((
                ClientData instanceData, Tcl_Interp *interp,
                  CONST char *optionName, CONST char *value));
typedef int (Tcl_DriverGetOptionProc) _ANSI_ARGS_((
                ClientData instanceData, Tcl_Interp *interp,
                CONST84 char *optionName, Tcl_DString *dsPtr));
typedef void      (Tcl_DriverWatchProc) _ANSI_ARGS_((
                ClientData instanceData, int mask));
typedef int (Tcl_DriverGetHandleProc) _ANSI_ARGS_((
                ClientData instanceData, int direction,
                ClientData *handlePtr));
typedef int (Tcl_DriverFlushProc) _ANSI_ARGS_((
                ClientData instanceData));
typedef int (Tcl_DriverHandlerProc) _ANSI_ARGS_((
                ClientData instanceData, int interestMask));
typedef Tcl_WideInt (Tcl_DriverWideSeekProc) _ANSI_ARGS_((
                ClientData instanceData, Tcl_WideInt offset,
                int mode, int *errorCodePtr));

 * The following declarations either map ckalloc and ckfree to
 * malloc and free, or they map them to procedures with all sorts
 * of debugging hooks defined in tclCkalloc.c.

#   define ckalloc(x) Tcl_DbCkalloc(x, __FILE__, __LINE__)
#   define ckfree(x)  Tcl_DbCkfree(x, __FILE__, __LINE__)
#   define ckrealloc(x,y) Tcl_DbCkrealloc((x), (y),__FILE__, __LINE__)
#   define attemptckalloc(x) Tcl_AttemptDbCkalloc(x, __FILE__, __LINE__)
#   define attemptckrealloc(x,y) Tcl_AttemptDbCkrealloc((x), (y), __FILE__, __LINE__)
#else /* !TCL_MEM_DEBUG */

 * If we are not using the debugging allocator, we should call the 
 * Tcl_Alloc, et al. routines in order to guarantee that every module
 * is using the same memory allocator both inside and outside of the
 * Tcl library.
#   define ckalloc(x) Tcl_Alloc(x)
#   define ckfree(x) Tcl_Free(x)
#   define ckrealloc(x,y) Tcl_Realloc(x,y)
#   define attemptckalloc(x) Tcl_AttemptAlloc(x)
#   define attemptckrealloc(x,y) Tcl_AttemptRealloc(x,y)
#   define Tcl_InitMemory(x)
#   define Tcl_DumpActiveMemory(x)
#   define Tcl_ValidateAllMemory(x,y)

#endif /* !TCL_MEM_DEBUG */

 * struct Tcl_ChannelType:
 * One such structure exists for each type (kind) of channel.
 * It collects together in one place all the functions that are
 * part of the specific channel type.
 * It is recommend that the Tcl_Channel* functions are used to access
 * elements of this structure, instead of direct accessing.
typedef struct Tcl_ChannelType {
    char *typeName;                 /* The name of the channel type in Tcl
                                         * commands. This storage is owned by
                                         * channel type. */
    Tcl_ChannelTypeVersion version; /* Version of the channel type. */
    Tcl_DriverCloseProc *closeProc; /* Procedure to call to close the
                               * channel, or TCL_CLOSE2PROC if the
                               * close2Proc should be used
                               * instead. */
    Tcl_DriverInputProc *inputProc; /* Procedure to call for input
                               * on channel. */
    Tcl_DriverOutputProc *outputProc;     /* Procedure to call for output
                               * on channel. */
    Tcl_DriverSeekProc *seekProc;   /* Procedure to call to seek
                               * on the channel. May be NULL. */
    Tcl_DriverSetOptionProc *setOptionProc;
                              /* Set an option on a channel. */
    Tcl_DriverGetOptionProc *getOptionProc;
                              /* Get an option from a channel. */
    Tcl_DriverWatchProc *watchProc; /* Set up the notifier to watch
                               * for events on this channel. */
    Tcl_DriverGetHandleProc *getHandleProc;
                              /* Get an OS handle from the channel
                               * or NULL if not supported. */
    Tcl_DriverClose2Proc *close2Proc;     /* Procedure to call to close the
                               * channel if the device supports
                               * closing the read & write sides
                               * independently. */
    Tcl_DriverBlockModeProc *blockModeProc;
                              /* Set blocking mode for the
                               * raw channel. May be NULL. */
     * Only valid in TCL_CHANNEL_VERSION_2 channels or later
    Tcl_DriverFlushProc *flushProc; /* Procedure to call to flush a
                               * channel. May be NULL. */
    Tcl_DriverHandlerProc *handlerProc;   /* Procedure to call to handle a
                               * channel event.  This will be passed
                               * up the stacked channel chain. */
     * Only valid in TCL_CHANNEL_VERSION_3 channels or later
    Tcl_DriverWideSeekProc *wideSeekProc;
                              /* Procedure to call to seek
                               * on the channel which can
                               * handle 64-bit offsets. May be
                               * NULL, and must be NULL if
                               * seekProc is NULL. */
} Tcl_ChannelType;

 * The following flags determine whether the blockModeProc above should
 * set the channel into blocking or nonblocking mode. They are passed
 * as arguments to the blockModeProc procedure in the above structure.
#define TCL_MODE_BLOCKING 0         /* Put channel into blocking mode. */
#define TCL_MODE_NONBLOCKING 1            /* Put channel into nonblocking
                               * mode. */

 * Enum for different types of file paths.
typedef enum Tcl_PathType {
} Tcl_PathType;

 * The following structure is used to pass glob type data amongst
 * the various glob routines and Tcl_FSMatchInDirectory.
typedef struct Tcl_GlobTypeData {
    /* Corresponds to bcdpfls as in 'find -t' */
    int type;
    /* Corresponds to file permissions */
    int perm;
    /* Acceptable mac type */
    Tcl_Obj* macType;
    /* Acceptable mac creator */
    Tcl_Obj* macCreator;
} Tcl_GlobTypeData;

 * type and permission definitions for glob command
#define TCL_GLOB_TYPE_BLOCK         (1<<0)
#define TCL_GLOB_TYPE_CHAR          (1<<1)
#define TCL_GLOB_TYPE_DIR           (1<<2)
#define TCL_GLOB_TYPE_PIPE          (1<<3)
#define TCL_GLOB_TYPE_FILE          (1<<4)
#define TCL_GLOB_TYPE_LINK          (1<<5)
#define TCL_GLOB_TYPE_SOCK          (1<<6)
#define TCL_GLOB_TYPE_MOUNT         (1<<7)

#define TCL_GLOB_PERM_RONLY         (1<<0)
#define TCL_GLOB_PERM_HIDDEN        (1<<1)
#define TCL_GLOB_PERM_R             (1<<2)
#define TCL_GLOB_PERM_W             (1<<3)
#define TCL_GLOB_PERM_X             (1<<4)

 * Typedefs for the various filesystem operations:
typedef int (Tcl_FSStatProc) _ANSI_ARGS_((Tcl_Obj *pathPtr, Tcl_StatBuf *buf));
typedef int (Tcl_FSAccessProc) _ANSI_ARGS_((Tcl_Obj *pathPtr, int mode));
typedef Tcl_Channel (Tcl_FSOpenFileChannelProc) 
      _ANSI_ARGS_((Tcl_Interp *interp, Tcl_Obj *pathPtr, 
      int mode, int permissions));
typedef int (Tcl_FSMatchInDirectoryProc) _ANSI_ARGS_((Tcl_Interp* interp, 
      Tcl_Obj *result, Tcl_Obj *pathPtr, CONST char *pattern, 
      Tcl_GlobTypeData * types));
typedef Tcl_Obj* (Tcl_FSGetCwdProc) _ANSI_ARGS_((Tcl_Interp *interp));
typedef int (Tcl_FSChdirProc) _ANSI_ARGS_((Tcl_Obj *pathPtr));
typedef int (Tcl_FSLstatProc) _ANSI_ARGS_((Tcl_Obj *pathPtr, 
                                 Tcl_StatBuf *buf));
typedef int (Tcl_FSCreateDirectoryProc) _ANSI_ARGS_((Tcl_Obj *pathPtr));
typedef int (Tcl_FSDeleteFileProc) _ANSI_ARGS_((Tcl_Obj *pathPtr));
typedef int (Tcl_FSCopyDirectoryProc) _ANSI_ARGS_((Tcl_Obj *srcPathPtr,
         Tcl_Obj *destPathPtr, Tcl_Obj **errorPtr));
typedef int (Tcl_FSCopyFileProc) _ANSI_ARGS_((Tcl_Obj *srcPathPtr,
                      Tcl_Obj *destPathPtr));
typedef int (Tcl_FSRemoveDirectoryProc) _ANSI_ARGS_((Tcl_Obj *pathPtr,
                      int recursive, Tcl_Obj **errorPtr));
typedef int (Tcl_FSRenameFileProc) _ANSI_ARGS_((Tcl_Obj *srcPathPtr,
                      Tcl_Obj *destPathPtr));
typedef void (Tcl_FSUnloadFileProc) _ANSI_ARGS_((Tcl_LoadHandle loadHandle));
typedef Tcl_Obj* (Tcl_FSListVolumesProc) _ANSI_ARGS_((void));
/* We have to declare the utime structure here. */
struct utimbuf;
typedef int (Tcl_FSUtimeProc) _ANSI_ARGS_((Tcl_Obj *pathPtr, 
                                 struct utimbuf *tval));
typedef int (Tcl_FSNormalizePathProc) _ANSI_ARGS_((Tcl_Interp *interp, 
                   Tcl_Obj *pathPtr, int nextCheckpoint));
typedef int (Tcl_FSFileAttrsGetProc) _ANSI_ARGS_((Tcl_Interp *interp,
                      int index, Tcl_Obj *pathPtr,
                      Tcl_Obj **objPtrRef));
typedef CONST char** (Tcl_FSFileAttrStringsProc) _ANSI_ARGS_((Tcl_Obj *pathPtr, 
                      Tcl_Obj** objPtrRef));
typedef int (Tcl_FSFileAttrsSetProc) _ANSI_ARGS_((Tcl_Interp *interp,
                      int index, Tcl_Obj *pathPtr,
                      Tcl_Obj *objPtr));
typedef Tcl_Obj* (Tcl_FSLinkProc) _ANSI_ARGS_((Tcl_Obj *pathPtr, 
                                     Tcl_Obj *toPtr, int linkType));
typedef int (Tcl_FSLoadFileProc) _ANSI_ARGS_((Tcl_Interp * interp, 
                      Tcl_Obj *pathPtr,
                      Tcl_LoadHandle *handlePtr,
                      Tcl_FSUnloadFileProc **unloadProcPtr));
typedef int (Tcl_FSPathInFilesystemProc) _ANSI_ARGS_((Tcl_Obj *pathPtr, 
                      ClientData *clientDataPtr));
typedef Tcl_Obj* (Tcl_FSFilesystemPathTypeProc) 
                      _ANSI_ARGS_((Tcl_Obj *pathPtr));
typedef Tcl_Obj* (Tcl_FSFilesystemSeparatorProc) 
                      _ANSI_ARGS_((Tcl_Obj *pathPtr));
typedef void (Tcl_FSFreeInternalRepProc) _ANSI_ARGS_((ClientData clientData));
typedef ClientData (Tcl_FSDupInternalRepProc) 
                      _ANSI_ARGS_((ClientData clientData));
typedef Tcl_Obj* (Tcl_FSInternalToNormalizedProc) 
                      _ANSI_ARGS_((ClientData clientData));
typedef ClientData (Tcl_FSCreateInternalRepProc) _ANSI_ARGS_((Tcl_Obj *pathPtr));

typedef struct Tcl_FSVersion_ *Tcl_FSVersion;

 * Data structures related to hooking into the filesystem

 * Filesystem version tag.  This was introduced in 8.4.
#define TCL_FILESYSTEM_VERSION_1    ((Tcl_FSVersion) 0x1)

 * struct Tcl_Filesystem:
 * One such structure exists for each type (kind) of filesystem.
 * It collects together in one place all the functions that are
 * part of the specific filesystem.  Tcl always accesses the
 * filesystem through one of these structures.
 * Not all entries need be non-NULL; any which are NULL are simply
 * ignored.  However, a complete filesystem should provide all of
 * these functions.  The explanations in the structure show
 * the importance of each function.

typedef struct Tcl_Filesystem {
    CONST char *typeName;   /* The name of the filesystem. */
    int structureLength;    /* Length of this structure, so future
                       * binary compatibility can be assured. */
    Tcl_FSVersion version;  
                      /* Version of the filesystem type. */
    Tcl_FSPathInFilesystemProc *pathInFilesystemProc;
                      /* Function to check whether a path is in 
                       * this filesystem.  This is the most
                       * important filesystem procedure. */
    Tcl_FSDupInternalRepProc *dupInternalRepProc;
                      /* Function to duplicate internal fs rep.  May
                       * be NULL (but then fs is less efficient). */ 
    Tcl_FSFreeInternalRepProc *freeInternalRepProc;
                      /* Function to free internal fs rep.  Must
                       * be implemented, if internal representations
                       * need freeing, otherwise it can be NULL. */ 
    Tcl_FSInternalToNormalizedProc *internalToNormalizedProc;
                      /* Function to convert internal representation
                       * to a normalized path.  Only required if
                       * the fs creates pure path objects with no
                       * string/path representation. */
    Tcl_FSCreateInternalRepProc *createInternalRepProc;
                      /* Function to create a filesystem-specific
                       * internal representation.  May be NULL
                       * if paths have no internal representation, 
                       * or if the Tcl_FSPathInFilesystemProc
                       * for this filesystem always immediately 
                       * creates an internal representation for 
                       * paths it accepts. */
    Tcl_FSNormalizePathProc *normalizePathProc;       
                      /* Function to normalize a path.  Should
                       * be implemented for all filesystems
                       * which can have multiple string 
                       * representations for the same path 
                       * object. */
    Tcl_FSFilesystemPathTypeProc *filesystemPathTypeProc;
                      /* Function to determine the type of a 
                       * path in this filesystem.  May be NULL. */
    Tcl_FSFilesystemSeparatorProc *filesystemSeparatorProc;
                      /* Function to return the separator 
                       * character(s) for this filesystem.  Must
                       * be implemented. */
    Tcl_FSStatProc *statProc; 
                       * Function to process a 'Tcl_FSStat()'
                       * call.  Must be implemented for any
                       * reasonable filesystem.
    Tcl_FSAccessProc *accessProc;       
                       * Function to process a 'Tcl_FSAccess()'
                       * call.  Must be implemented for any
                       * reasonable filesystem.
    Tcl_FSOpenFileChannelProc *openFileChannelProc; 
                       * Function to process a
                       * 'Tcl_FSOpenFileChannel()' call.  Must be
                       * implemented for any reasonable
                       * filesystem.
    Tcl_FSMatchInDirectoryProc *matchInDirectoryProc;  
                      /* Function to process a 
                       * 'Tcl_FSMatchInDirectory()'.  If not
                       * implemented, then glob and recursive
                       * copy functionality will be lacking in
                       * the filesystem. */
    Tcl_FSUtimeProc *utimeProc;       
                      /* Function to process a 
                       * 'Tcl_FSUtime()' call.  Required to
                       * allow setting (not reading) of times 
                       * with 'file mtime', 'file atime' and
                       * the open-r/open-w/fcopy implementation
                       * of 'file copy'. */
    Tcl_FSLinkProc *linkProc; 
                      /* Function to process a 
                       * 'Tcl_FSLink()' call.  Should be
                       * implemented only if the filesystem supports
                       * links (reading or creating). */
    Tcl_FSListVolumesProc *listVolumesProc;         
                      /* Function to list any filesystem volumes 
                       * added by this filesystem.  Should be
                       * implemented only if the filesystem adds
                       * volumes at the head of the filesystem. */
    Tcl_FSFileAttrStringsProc *fileAttrStringsProc;
                      /* Function to list all attributes strings 
                       * which are valid for this filesystem.  
                       * If not implemented the filesystem will
                       * not support the 'file attributes' command.
                       * This allows arbitrary additional information
                       * to be attached to files in the filesystem. */
    Tcl_FSFileAttrsGetProc *fileAttrsGetProc;
                      /* Function to process a 
                       * 'Tcl_FSFileAttrsGet()' call, used by
                       * 'file attributes'. */
    Tcl_FSFileAttrsSetProc *fileAttrsSetProc;
                      /* Function to process a 
                       * 'Tcl_FSFileAttrsSet()' call, used by
                       * 'file attributes'.  */
    Tcl_FSCreateDirectoryProc *createDirectoryProc;       
                      /* Function to process a 
                       * 'Tcl_FSCreateDirectory()' call. Should
                       * be implemented unless the FS is
                       * read-only. */
    Tcl_FSRemoveDirectoryProc *removeDirectoryProc;       
                      /* Function to process a 
                       * 'Tcl_FSRemoveDirectory()' call. Should
                       * be implemented unless the FS is
                       * read-only. */
    Tcl_FSDeleteFileProc *deleteFileProc;     
                      /* Function to process a 
                       * 'Tcl_FSDeleteFile()' call.  Should
                       * be implemented unless the FS is
                       * read-only. */
    Tcl_FSCopyFileProc *copyFileProc; 
                      /* Function to process a 
                       * 'Tcl_FSCopyFile()' call.  If not
                       * implemented Tcl will fall back
                       * on open-r, open-w and fcopy as
                       * a copying mechanism, for copying
                       * actions initiated in Tcl (not C). */
    Tcl_FSRenameFileProc *renameFileProc;     
                      /* Function to process a 
                       * 'Tcl_FSRenameFile()' call.  If not
                       * implemented, Tcl will fall back on
                       * a copy and delete mechanism, for 
                       * rename actions initiated in Tcl (not C). */
    Tcl_FSCopyDirectoryProc *copyDirectoryProc;     
                      /* Function to process a 
                       * 'Tcl_FSCopyDirectory()' call.  If
                       * not implemented, Tcl will fall back
                       * on a recursive create-dir, file copy
                       * mechanism, for copying actions
                       * initiated in Tcl (not C). */
    Tcl_FSLstatProc *lstatProc;         
                      /* Function to process a 
                       * 'Tcl_FSLstat()' call.  If not implemented,
                       * Tcl will attempt to use the 'statProc'
                       * defined above instead. */
    Tcl_FSLoadFileProc *loadFileProc; 
                      /* Function to process a 
                       * 'Tcl_FSLoadFile()' call.  If not
                       * implemented, Tcl will fall back on
                       * a copy to native-temp followed by a 
                       * Tcl_FSLoadFile on that temporary copy. */
    Tcl_FSGetCwdProc *getCwdProc;     
                       * Function to process a 'Tcl_FSGetCwd()'
                       * call.  Most filesystems need not
                       * implement this.  It will usually only be
                       * called once, if 'getcwd' is called
                       * before 'chdir'.  May be NULL.
    Tcl_FSChdirProc *chdirProc;         
                       * Function to process a 'Tcl_FSChdir()'
                       * call.  If filesystems do not implement
                       * this, it will be emulated by a series of
                       * directory access checks.  Otherwise,
                       * virtual filesystems which do implement
                       * it need only respond with a positive
                       * return result if the dirName is a valid
                       * directory in their filesystem.  They
                       * need not remember the result, since that
                       * will be automatically remembered for use
                       * by GetCwd.  Real filesystems should
                       * carry out the correct action (i.e. call
                       * the correct system 'chdir' api).  If not
                       * implemented, then 'cd' and 'pwd' will
                       * fail inside the filesystem.
} Tcl_Filesystem;

 * The following definitions are used as values for the 'linkAction' flag
 * to Tcl_FSLink, or the linkProc of any filesystem.  Any combination
 * of flags can be given.  For link creation, the linkProc should create
 * a link which matches any of the types given.
 * TCL_CREATE_SYMBOLIC_LINK:  Create a symbolic or soft link.
 * TCL_CREATE_HARD_LINK:      Create a hard link.
#define TCL_CREATE_HARD_LINK       0x02

 * The following structure represents the Notifier functions that
 * you can override with the Tcl_SetNotifier call.
typedef struct Tcl_NotifierProcs {
    Tcl_SetTimerProc *setTimerProc;
    Tcl_WaitForEventProc *waitForEventProc;
    Tcl_CreateFileHandlerProc *createFileHandlerProc;
    Tcl_DeleteFileHandlerProc *deleteFileHandlerProc;
    Tcl_InitNotifierProc *initNotifierProc;
    Tcl_FinalizeNotifierProc *finalizeNotifierProc;
    Tcl_AlertNotifierProc *alertNotifierProc;
    Tcl_ServiceModeHookProc *serviceModeHookProc;
} Tcl_NotifierProcs;

 * The following structure represents a user-defined encoding.  It collects
 * together all the functions that are used by the specific encoding.
typedef struct Tcl_EncodingType {
    CONST char *encodingName; /* The name of the encoding, e.g.  "euc-jp".
                         * This name is the unique key for this
                         * encoding type. */
    Tcl_EncodingConvertProc *toUtfProc;
                        /* Procedure to convert from external
                         * encoding into UTF-8. */
    Tcl_EncodingConvertProc *fromUtfProc;
                        /* Procedure to convert from UTF-8 into
                         * external encoding. */
    Tcl_EncodingFreeProc *freeProc;
                        /* If non-NULL, procedure to call when this
                         * encoding is deleted. */
    ClientData clientData;    /* Arbitrary value associated with encoding
                         * type.  Passed to conversion procedures. */
    int nullSize;       /* Number of zero bytes that signify
                         * end-of-string in this encoding.  This
                         * number is used to determine the source
                         * string length when the srcLen argument is
                         * negative.  Must be 1 or 2. */
} Tcl_EncodingType;    

 * The following definitions are used as values for the conversion control
 * flags argument when converting text from one character set to another:
 * TCL_ENCODING_START:        Signifies that the source buffer is the first
 *                      block in a (potentially multi-block) input
 *                      stream.  Tells the conversion procedure to
 *                      reset to an initial state and perform any
 *                      initialization that needs to occur before the
 *                      first byte is converted.  If the source
 *                      buffer contains the entire input stream to be
 *                      converted, this flag should be set.
 * TCL_ENCODING_END:          Signifies that the source buffer is the last
 *                      block in a (potentially multi-block) input
 *                      stream.  Tells the conversion routine to
 *                      perform any finalization that needs to occur
 *                      after the last byte is converted and then to
 *                      reset to an initial state.  If the source
 *                      buffer contains the entire input stream to be
 *                      converted, this flag should be set.
 * TCL_ENCODING_STOPONERROR:  If set, then the converter will return
 *                      immediately upon encountering an invalid
 *                      byte sequence or a source character that has
 *                      no mapping in the target encoding.  If clear,
 *                      then the converter will skip the problem,
 *                      substituting one or more "close" characters
 *                      in the destination buffer and then continue
 *                      to sonvert the source.
#define TCL_ENCODING_START          0x01
#define TCL_ENCODING_END            0x02

 * The following data structures and declarations are for the new Tcl
 * parser.

 * For each word of a command, and for each piece of a word such as a
 * variable reference, one of the following structures is created to
 * describe the token.
typedef struct Tcl_Token {
    int type;                 /* Type of token, such as TCL_TOKEN_WORD;
                         * see below for valid types. */
    CONST char *start;        /* First character in token. */
    int size;                 /* Number of bytes in token. */
    int numComponents;        /* If this token is composed of other
                         * tokens, this field tells how many of
                         * them there are (including components of
                         * components, etc.).  The component tokens
                         * immediately follow this one. */
} Tcl_Token;

 * Type values defined for Tcl_Token structures.  These values are
 * defined as mask bits so that it's easy to check for collections of
 * types.
 * TCL_TOKEN_WORD -           The token describes one word of a command,
 *                      from the first non-blank character of
 *                      the word (which may be " or {) up to but
 *                      not including the space, semicolon, or
 *                      bracket that terminates the word. 
 *                      NumComponents counts the total number of
 *                      sub-tokens that make up the word.  This
 *                      includes, for example, sub-tokens of
 *                      TCL_TOKEN_VARIABLE tokens.
 * TCL_TOKEN_SIMPLE_WORD -    This token is just like TCL_TOKEN_WORD
 *                      except that the word is guaranteed to
 *                      consist of a single TCL_TOKEN_TEXT
 *                      sub-token.
 * TCL_TOKEN_TEXT -           The token describes a range of literal
 *                      text that is part of a word. 
 *                      NumComponents is always 0.
 * TCL_TOKEN_BS -       The token describes a backslash sequence
 *                      that must be collapsed.  NumComponents
 *                      is always 0.
 * TCL_TOKEN_COMMAND -        The token describes a command whose result
 *                      must be substituted into the word.  The
 *                      token includes the enclosing brackets. 
 *                      NumComponents is always 0.
 * TCL_TOKEN_VARIABLE -       The token describes a variable
 *                      substitution, including the dollar sign,
 *                      variable name, and array index (if there
 *                      is one) up through the right
 *                      parentheses.  NumComponents tells how
 *                      many additional tokens follow to
 *                      represent the variable name.  The first
 *                      token will be a TCL_TOKEN_TEXT token
 *                      that describes the variable name.  If
 *                      the variable is an array reference then
 *                      there will be one or more additional
 *                      tokens, of type TCL_TOKEN_TEXT,
 *                      TCL_TOKEN_BS, TCL_TOKEN_COMMAND, and
 *                      TCL_TOKEN_VARIABLE, that describe the
 *                      array index; numComponents counts the
 *                      total number of nested tokens that make
 *                      up the variable reference, including
 *                      sub-tokens of TCL_TOKEN_VARIABLE tokens.
 * TCL_TOKEN_SUB_EXPR -       The token describes one subexpression of a
 *                      expression, from the first non-blank
 *                      character of the subexpression up to but not
 *                      including the space, brace, or bracket
 *                      that terminates the subexpression. 
 *                      NumComponents counts the total number of
 *                      following subtokens that make up the
 *                      subexpression; this includes all subtokens
 *                      for any nested TCL_TOKEN_SUB_EXPR tokens.
 *                      For example, a numeric value used as a
 *                      primitive operand is described by a
 *                      TCL_TOKEN_SUB_EXPR token followed by a
 *                      TCL_TOKEN_TEXT token. A binary subexpression
 *                      is described by a TCL_TOKEN_SUB_EXPR token
 *                      followed by the   TCL_TOKEN_OPERATOR token
 *                      for the operator, then TCL_TOKEN_SUB_EXPR
 *                      tokens for the left then the right operands.
 * TCL_TOKEN_OPERATOR -       The token describes one expression operator.
 *                      An operator might be the name of a math
 *                      function such as "abs". A TCL_TOKEN_OPERATOR
 *                      token is always preceeded by one
 *                      TCL_TOKEN_SUB_EXPR token for the operator's
 *                      subexpression, and is followed by zero or
 *                      more TCL_TOKEN_SUB_EXPR tokens for the
 *                      operator's operands. NumComponents is
 *                      always 0.
#define TCL_TOKEN_WORD        1
#define TCL_TOKEN_TEXT        4
#define TCL_TOKEN_BS          8
#define TCL_TOKEN_COMMAND     16
#define TCL_TOKEN_VARIABLE    32
#define TCL_TOKEN_SUB_EXPR    64
#define TCL_TOKEN_OPERATOR    128

 * Parsing error types.  On any parsing error, one of these values
 * will be stored in the error field of the Tcl_Parse structure
 * defined below.
#define TCL_PARSE_SUCCESS           0
#define TCL_PARSE_QUOTE_EXTRA       1
#define TCL_PARSE_BRACE_EXTRA       2
#define TCL_PARSE_MISSING_BRACE           3
#define TCL_PARSE_MISSING_PAREN           5
#define TCL_PARSE_MISSING_QUOTE           6
#define TCL_PARSE_SYNTAX            8
#define TCL_PARSE_BAD_NUMBER        9

 * A structure of the following type is filled in by Tcl_ParseCommand.
 * It describes a single command parsed from an input string.

typedef struct Tcl_Parse {
    CONST char *commentStart; /* Pointer to # that begins the first of
                         * one or more comments preceding the
                         * command. */
    int commentSize;          /* Number of bytes in comments (up through
                         * newline character that terminates the
                         * last comment).  If there were no
                         * comments, this field is 0. */
    CONST char *commandStart; /* First character in first word of command. */
    int commandSize;          /* Number of bytes in command, including
                         * first character of first word, up
                         * through the terminating newline,
                         * close bracket, or semicolon. */
    int numWords;       /* Total number of words in command.  May
                         * be 0. */
    Tcl_Token *tokenPtr;      /* Pointer to first token representing
                         * the words of the command.  Initially
                         * points to staticTokens, but may change
                         * to point to malloc-ed space if command
                         * exceeds space in staticTokens. */
    int numTokens;            /* Total number of tokens in command. */
    int tokensAvailable;      /* Total number of tokens available at
                         * *tokenPtr. */
    int errorType;            /* One of the parsing error types defined
                         * above. */

     * The fields below are intended only for the private use of the
     * parser.    They should not be used by procedures that invoke
     * Tcl_ParseCommand.

    CONST char *string;       /* The original command string passed to
                         * Tcl_ParseCommand. */
    CONST char *end;          /* Points to the character just after the
                         * last one in the command string. */
    Tcl_Interp *interp;       /* Interpreter to use for error reporting,
                         * or NULL. */
    CONST char *term;         /* Points to character in string that
                         * terminated most recent token.  Filled in
                         * by ParseTokens.  If an error occurs,
                         * points to beginning of region where the
                         * error occurred (e.g. the open brace if
                         * the close brace is missing). */
    int incomplete;           /* This field is set to 1 by Tcl_ParseCommand
                         * if the command appears to be incomplete.
                         * This information is used by
                         * Tcl_CommandComplete. */
    Tcl_Token staticTokens[NUM_STATIC_TOKENS];
                        /* Initial space for tokens for command.
                         * This space should be large enough to
                         * accommodate most commands; dynamic
                         * space is allocated for very large
                         * commands that don't fit here. */
} Tcl_Parse;

 * The following definitions are the error codes returned by the conversion
 * routines:
 * TCL_OK:              All characters were converted.
 * TCL_CONVERT_NOSPACE:       The output buffer would not have been large
 *                      enough for all of the converted data; as many
 *                      characters as could fit were converted though.
 * TCL_CONVERT_MULTIBYTE:     The last few bytes in the source string were
 *                      the beginning of a multibyte sequence, but
 *                      more bytes were needed to complete this
 *                      sequence.  A subsequent call to the conversion
 *                      routine should pass the beginning of this
 *                      unconverted sequence plus additional bytes
 *                      from the source stream to properly convert
 *                      the formerly split-up multibyte sequence.
 * TCL_CONVERT_SYNTAX:        The source stream contained an invalid
 *                      character sequence.  This may occur if the
 *                      input stream has been damaged or if the input
 *                      encoding method was misidentified.  This error
 *                      is reported only if TCL_ENCODING_STOPONERROR
 *                      was specified.
 * TCL_CONVERT_UNKNOWN:       The source string contained a character
 *                      that could not be represented in the target
 *                      encoding.  This error is reported only if
 *                      TCL_ENCODING_STOPONERROR was specified.
#define TCL_CONVERT_MULTIBYTE       -1
#define TCL_CONVERT_SYNTAX          -2
#define TCL_CONVERT_UNKNOWN         -3
#define TCL_CONVERT_NOSPACE         -4

 * The maximum number of bytes that are necessary to represent a single
 * Unicode character in UTF-8.  The valid values should be 3 or 6 (or
 * perhaps 1 if we want to support a non-unicode enabled core).
 * If 3, then Tcl_UniChar must be 2-bytes in size (UCS-2). (default)
 * If 6, then Tcl_UniChar must be 4-bytes in size (UCS-4).
 * At this time UCS-2 mode is the default and recommended mode.
 * UCS-4 is experimental and not recommended.  It works for the core,
 * but most extensions expect UCS-2.
#ifndef TCL_UTF_MAX
#define TCL_UTF_MAX           3

 * This represents a Unicode character.  Any changes to this should
 * also be reflected in regcustom.h.
#if TCL_UTF_MAX > 3
     * unsigned int isn't 100% accurate as it should be a strict 4-byte
     * value (perhaps wchar_t).  64-bit systems may have troubles.  The
     * size of this value must be reflected correctly in regcustom.h.
typedef unsigned int Tcl_UniChar;
typedef unsigned short Tcl_UniChar;

 * Deprecated Tcl procedures:
#   define Tcl_EvalObj(interp,objPtr) \
#   define Tcl_GlobalEvalObj(interp,objPtr) \

 * These function have been renamed. The old names are deprecated, but we
 * define these macros for backwards compatibilty.
#define Tcl_Ckalloc Tcl_Alloc
#define Tcl_Ckfree Tcl_Free
#define Tcl_Ckrealloc Tcl_Realloc
#define Tcl_Return Tcl_SetResult
#define Tcl_TildeSubst Tcl_TranslateFileName
#define panic Tcl_Panic
#define panicVA Tcl_PanicVA

 * The following constant is used to test for older versions of Tcl
 * in the stubs tables.
 * Jan Nijtman's plus patch uses 0xFCA1BACF, so we need to pick a different
 * value since the stubs tables don't match.

#define TCL_STUB_MAGIC ((int)0xFCA3BACF)

 * The following function is required to be defined in all stubs aware
 * extensions.  The function is actually implemented in the stub
 * library, not the main Tcl library, although there is a trivial
 * implementation in the main library in case an extension is statically
 * linked into an application.

EXTERN CONST char *     Tcl_InitStubs _ANSI_ARGS_((Tcl_Interp *interp,
                      CONST char *version, int exact));


 * When not using stubs, make it a macro.

#define Tcl_InitStubs(interp, version, exact) \
    Tcl_PkgRequire(interp, "Tcl", version, exact)


 * Include the public function declarations that are accessible via
 * the stubs table.

#include "tclDecls.h"

 * Include platform specific public function declarations that are
 * accessible via the stubs table.

 * tclPlatDecls.h can't be included here on the Mac, as we need
 * Mac specific headers to define the Mac types used in this file,
 * but these Mac haders conflict with a number of tk types
 * and thus can't be included in the globally read tcl.h
 * This header was originally added here as a fix for bug 5241
 * (stub link error for symbols in TclPlatStubs table), as a work-
 * around for the bug on the mac, tclMac.h is included immediately 
 * after tcl.h in the tcl precompiled header (with DLLEXPORT set).

#if !defined(MAC_TCL)
#include "tclPlatDecls.h"

 * Public functions that are not accessible via the stubs table.

EXTERN void Tcl_Main _ANSI_ARGS_((int argc, char **argv,
      Tcl_AppInitProc *appInitProc));

 * Convenience declaration of Tcl_AppInit for backwards compatibility.
 * This function is not *implemented* by the tcl library, so the storage
 * class is neither DLLEXPORT nor DLLIMPORT

EXTERN int        Tcl_AppInit _ANSI_ARGS_((Tcl_Interp *interp));


#endif /* RC_INVOKED */

 * end block for C++
#ifdef __cplusplus

#endif /* _TCL */

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