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markom |
/*
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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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* This file should only be included once in the entire set of C
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* source files for Tcl (by the respective platform initialization
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* C source file, tclUnixInit.c and tclWinInit.c) and thus the
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* presence of the routine, TclSetPreInitScript, below, should be
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* harmless.
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*
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* Copyright (c) 1998 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tclInitScript.h,v 1.1.1.1 2002-01-16 10:25:27 markom 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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* $tclDefaultLibrary - this value is initialized by TclPlatformInit
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* from a static C variable that was set at
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* compile time
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*
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* <executable directory>/../lib/tcl$tcl_version
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* - look for a lib/tcl<ver> in a sibling of
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* the bin directory (e.g. install hierarchy)
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*
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* <executable directory>/../../lib/tcl$tcl_version
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* - look for a lib/tcl<ver> in a sibling of
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* the bin/arch directory
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*
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* <executable directory>/../library
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* - look in build directory
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*
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* <executable directory>/../../library
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* - look in build directory from unix/arch
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*
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* <executable directory>/../../tcl$tcl_patchLevel/library
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* - look for tcl build directory relative
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* to a parallel build directory (e.g. Tk)
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*
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* <executable directory>/../../../tcl$tcl_patchLevel/library
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* - look for tcl build directory relative
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* to a parallel build directory from
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* down inside unix/arch directory
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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_library tcl_version tcl_patchLevel errorInfo\n\
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global tcl_pkgPath env tclDefaultLibrary\n\
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global tcl_platform\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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# CYGNUS LOCAL: I've changed this alot. \n\
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# Basically we only care about two cases,\n\
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# if we are installed, and if we are in the devo tree...\n\
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# The next few are for if we are installed:\n\
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# NB. We also want this to work if the user is actually\n\
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# running a link and not the actual program. So look for a\n\
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# link and chase it down to its source.\n\
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set execName [info nameofexecutable]\n\
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if {[string compare [file type $execName] \"link\"] == 0} {\n\
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set execName [file readlink $execName]\n\
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if {[string compare [file pathtype $execName] \"relative\"] == 0} {\n\
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set execName [file join [pwd] $execName]\n\
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}\n\
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}\n\
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set parentDir [file dirname [file dirname $execName]]\n\
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lappend dirs [file join $parentDir share tcl$tcl_version]\n\
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lappend dirs [file join $parentDir \"usr\" share tcl$tcl_version]\n\
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lappend dirs [file join [file dirname $parentDir] share tcl$tcl_version]\n\
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# NOW, let's try to find it in the build tree...\n\
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# Rather than play all the games Scriptics does, if we are in the build\n\
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# tree there will be a tclConfig.sh relative to the executible's directory, and we \n\
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# can read it and get the source dir from there...\n\
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#\n\
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# We duplicate all the directories in the search, one w/o the version and one with.\n\
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# Most modules use ../../tcl/{unix,win}\n\
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lappend configDirs [file join [file dirname $parentDir] tcl$tcl_version $tcl_platform(platform)]\n\
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lappend configDirs [file join [file dirname $parentDir] tcl $tcl_platform(platform)]\n\
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# This one gets tclsh...\n\
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lappend configDirs $execName \n\
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# This one is for gdb, and any other app which has its executible in the top directory.\n\
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lappend configDirs [file join $parentDir tcl$tcl_version $tcl_platform(platform)]\n\
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lappend configDirs [file join $parentDir tcl $tcl_platform(platform)]\n\
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# This last will handle itclsh & itkwish (../../../tcl/{unix,win}):\n\
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lappend configDirs [file join [file dirname [file dirname $parentDir]] tcl$tcl_version $tcl_platform(platform)]\n\
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lappend configDirs [file join [file dirname [file dirname $parentDir]] tcl $tcl_platform(platform)]\n\
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\n\
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foreach i $configDirs {\n\
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set configFile [file join $i tclConfig.sh]\n\
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if {[file exists $configFile]} {\n\
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if {![catch {open $configFile r} fileH]} {\n\
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set srcDir {}\n\
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while {[gets $fileH line] >= 0} {\n\
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if {[regexp {^TCL_SRC_DIR='([^']*)'} $line dummy srcDir]} {\n\
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break\n\
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}\n\
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}\n\
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close $fileH\n\
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if {$srcDir != \"\"} {\n\
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lappend dirs [file join $srcDir library]\n\
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break\n\
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}\n\
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}\n\
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}\n\
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}\n\
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}\n\
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# I also moved this from just after TCL_LIBRARY to last.\n\
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# I only want to use the compiled in library if I am really lost, because\n\
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# otherwise if I have installed once, but am working in the build directory,\n\
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# I will always pick up the installed files, which will be very confusing...\n\
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lappend dirs $tclDefaultLibrary\n\
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unset tclDefaultLibrary\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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set tcl_pkgPath [lreplace $tcl_pkgPath end end]\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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