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dashley |
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/* $Header$ */ |
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/* |
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* tclInitScript.h -- |
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* |
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* This file contains Unix & Windows common init script |
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* It is not used on the Mac. (the mac init script is in tclMacInit.c) |
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* |
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* Copyright (c) 1998 Sun Microsystems, Inc. |
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* Copyright (c) 1999 by Scriptics Corporation. |
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* All rights reserved. |
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* |
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* RCS: @(#) $Id: tclinitscript.h,v 1.1.1.1 2001/06/13 04:39:33 dtashley Exp $ |
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*/ |
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/* |
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* In order to find init.tcl during initialization, the following script |
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* is invoked by Tcl_Init(). It looks in several different directories: |
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* |
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* $tcl_library - can specify a primary location, if set |
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* no other locations will be checked |
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* |
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* $env(TCL_LIBRARY) - highest priority so user can always override |
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* the search path unless the application has |
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* specified an exact directory above |
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* |
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* $tclDefaultLibrary - this value is initialized by TclPlatformInit |
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* from a static C variable that was set at |
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* compile time |
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* |
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* $tcl_libPath - this value is initialized by a call to |
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* TclGetLibraryPath called from Tcl_Init. |
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* |
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* The first directory on this path that contains a valid init.tcl script |
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* will be set as the value of tcl_library. |
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* |
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* Note that this entire search mechanism can be bypassed by defining an |
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* alternate tclInit procedure before calling Tcl_Init(). |
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*/ |
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static char initScript[] = "if {[info proc tclInit]==\"\"} {\n\ |
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proc tclInit {} {\n\ |
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global tcl_libPath tcl_library errorInfo\n\ |
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global env tclDefaultLibrary\n\ |
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rename tclInit {}\n\ |
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set errors {}\n\ |
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set dirs {}\n\ |
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if {[info exists tcl_library]} {\n\ |
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lappend dirs $tcl_library\n\ |
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} else {\n\ |
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if {[info exists env(TCL_LIBRARY)]} {\n\ |
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lappend dirs $env(TCL_LIBRARY)\n\ |
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}\n\ |
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lappend dirs $tclDefaultLibrary\n\ |
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unset tclDefaultLibrary\n\ |
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set dirs [concat $dirs $tcl_libPath]\n\ |
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}\n\ |
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foreach i $dirs {\n\ |
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set tcl_library $i\n\ |
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set tclfile [file join $i init.tcl]\n\ |
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if {[file exists $tclfile]} {\n\ |
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if {![catch {uplevel #0 [list source $tclfile]} msg]} {\n\ |
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return\n\ |
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} else {\n\ |
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append errors \"$tclfile: $msg\n$errorInfo\n\"\n\ |
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}\n\ |
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}\n\ |
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}\n\ |
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set msg \"Can't find a usable init.tcl in the following directories: \n\"\n\ |
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append msg \" $dirs\n\n\"\n\ |
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append msg \"$errors\n\n\"\n\ |
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append msg \"This probably means that Tcl wasn't installed properly.\n\"\n\ |
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error $msg\n\ |
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}\n\ |
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}\n\ |
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tclInit"; |
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/* |
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* A pointer to a string that holds an initialization script that if non-NULL |
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* is evaluated in Tcl_Init() prior to the the built-in initialization script |
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* above. This variable can be modified by the procedure below. |
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*/ |
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static char * tclPreInitScript = NULL; |
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/* |
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*---------------------------------------------------------------------- |
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* |
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* TclSetPreInitScript -- |
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* |
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* This routine is used to change the value of the internal |
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* variable, tclPreInitScript. |
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* |
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* Results: |
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* Returns the current value of tclPreInitScript. |
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* |
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* Side effects: |
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* Changes the way Tcl_Init() routine behaves. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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char * |
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TclSetPreInitScript (string) |
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char *string; /* Pointer to a script. */ |
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{ |
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char *prevString = tclPreInitScript; |
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tclPreInitScript = string; |
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return(prevString); |
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} |
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/* End of tclinitscript.h */ |