tclInitScript.h from Gdb at Krugle
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/*
* tclInitScript.h --
*
* This file contains Unix & Windows common init script
* It is not used on the Mac. (the mac init script is in tclMacInit.c)
*
* Copyright (c) 1998 Sun Microsystems, Inc.
* Copyright (c) 1999 by Scriptics Corporation.
* All rights reserved.
*
* RCS: @(#) $Id: tclInitScript.h,v 1.13 2001/09/10 21:06:55 dgp Exp $
*/
/*
* In order to find init.tcl during initialization, the following script
* is invoked by Tcl_Init(). It looks in several different directories:
*
* $tcl_library - can specify a primary location, if set
* no other locations will be checked
*
* $env(TCL_LIBRARY) - highest priority so user can always override
* the search path unless the application has
* specified an exact directory above
*
* $tclDefaultLibrary - this value is initialized by TclPlatformInit
* from a static C variable that was set at
* compile time
*
* $tcl_libPath - this value is initialized by a call to
* TclGetLibraryPath called from Tcl_Init.
*
* The first directory on this path that contains a valid init.tcl script
* will be set as the value of tcl_library.
*
* Note that this entire search mechanism can be bypassed by defining an
* alternate tclInit procedure before calling Tcl_Init().
*/
static char initScript[] = "if {[info proc tclInit]==\"\"} {\n\
proc tclInit {} {\n\
global tcl_libPath tcl_library errorInfo\n\
global env tclDefaultLibrary\n\
rename tclInit {}\n\
set errors {}\n\
set dirs {}\n\
if {[info exists tcl_library]} {\n\
lappend dirs $tcl_library\n\
} else {\n\
if {[info exists env(TCL_LIBRARY)]} {\n\
lappend dirs $env(TCL_LIBRARY)\n\
}\n\
catch {\n\
lappend dirs $tclDefaultLibrary\n\
unset tclDefaultLibrary\n\
}\n\
set dirs [concat $dirs $tcl_libPath]\n\
}\n\
foreach i $dirs {\n\
set tcl_library $i\n\
set tclfile [file join $i init.tcl]\n\
if {[file exists $tclfile]} {\n\
if {![catch {uplevel #0 [list source $tclfile]} msg]} {\n\
return\n\
} else {\n\
append errors \"$tclfile: $msg\n$errorInfo\n\"\n\
}\n\
}\n\
}\n\
set msg \"Can't find a usable init.tcl in the following directories: \n\"\n\
append msg \" $dirs\n\n\"\n\
append msg \"$errors\n\n\"\n\
append msg \"This probably means that Tcl wasn't installed properly.\n\"\n\
error $msg\n\
}\n\
}\n\
tclInit";
/*
* A pointer to a string that holds an initialization script that if non-NULL
* is evaluated in Tcl_Init() prior to the the built-in initialization script
* above. This variable can be modified by the procedure below.
*/
static char * tclPreInitScript = NULL;
/*
*----------------------------------------------------------------------
*
* TclSetPreInitScript --
*
* This routine is used to change the value of the internal
* variable, tclPreInitScript.
*
* Results:
* Returns the current value of tclPreInitScript.
*
* Side effects:
* Changes the way Tcl_Init() routine behaves.
*
*----------------------------------------------------------------------
*/
char *
TclSetPreInitScript (string)
char *string; /* Pointer to a script. */
{
char *prevString = tclPreInitScript;
tclPreInitScript = string;
return(prevString);
}
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