/* * 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 1.1.1.1 2007/07/10 15:04:23 duncan 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); }