shared_source/c_tcl_base_7_5_w_mods/tclinitscript.h

/* $Header$ */
/* 
 * 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 2001/06/13 04:39:33 dtashley 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\
        lappend dirs $tclDefaultLibrary\n\
        unset tclDefaultLibrary\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);
}

/* End of tclinitscript.h */
1	/* $Header$ */
2	/*
3	* tclInitScript.h --
4	*
5	* This file contains Unix & Windows common init script
6	* It is not used on the Mac. (the mac init script is in tclMacInit.c)
7	*
8	* Copyright (c) 1998 Sun Microsystems, Inc.
9	* Copyright (c) 1999 by Scriptics Corporation.
10	* All rights reserved.
11	*
12	* RCS: @(#) $Id: tclinitscript.h,v 1.1.1.1 2001/06/13 04:39:33 dtashley Exp $
13	*/
14
15	/*
16	* In order to find init.tcl during initialization, the following script
17	* is invoked by Tcl_Init(). It looks in several different directories:
18	*
19	* $tcl_library - can specify a primary location, if set
20	* no other locations will be checked
21	*
22	* $env(TCL_LIBRARY) - highest priority so user can always override
23	* the search path unless the application has
24	* specified an exact directory above
25	*
26	* $tclDefaultLibrary - this value is initialized by TclPlatformInit
27	* from a static C variable that was set at
28	* compile time
29	*
30	* $tcl_libPath - this value is initialized by a call to
31	* TclGetLibraryPath called from Tcl_Init.
32	*
33	* The first directory on this path that contains a valid init.tcl script
34	* will be set as the value of tcl_library.
35	*
36	* Note that this entire search mechanism can be bypassed by defining an
37	* alternate tclInit procedure before calling Tcl_Init().
38	*/
39
40	static char initScript[] = "if {[info proc tclInit]==\"\"} {\n\
41	proc tclInit {} {\n\
42	global tcl_libPath tcl_library errorInfo\n\
43	global env tclDefaultLibrary\n\
44	rename tclInit {}\n\
45	set errors {}\n\
46	set dirs {}\n\
47	if {[info exists tcl_library]} {\n\
48	lappend dirs $tcl_library\n\
49	} else {\n\
50	if {[info exists env(TCL_LIBRARY)]} {\n\
51	lappend dirs $env(TCL_LIBRARY)\n\
52	}\n\
53	lappend dirs $tclDefaultLibrary\n\
54	unset tclDefaultLibrary\n\
55	set dirs [concat $dirs $tcl_libPath]\n\
56	}\n\
57	foreach i $dirs {\n\
58	set tcl_library $i\n\
59	set tclfile [file join $i init.tcl]\n\
60	if {[file exists $tclfile]} {\n\
61	if {![catch {uplevel #0 [list source $tclfile]} msg]} {\n\
62	return\n\
63	} else {\n\
64	append errors \"$tclfile: $msg\n$errorInfo\n\"\n\
65	}\n\
66	}\n\
67	}\n\
68	set msg \"Can't find a usable init.tcl in the following directories: \n\"\n\
69	append msg \" $dirs\n\n\"\n\
70	append msg \"$errors\n\n\"\n\
71	append msg \"This probably means that Tcl wasn't installed properly.\n\"\n\
72	error $msg\n\
73	}\n\
74	}\n\
75	tclInit";
76
77
78	/*
79	* A pointer to a string that holds an initialization script that if non-NULL
80	* is evaluated in Tcl_Init() prior to the the built-in initialization script
81	* above. This variable can be modified by the procedure below.
82	*/
83
84	static char * tclPreInitScript = NULL;
85
86
87	/*
88	*----------------------------------------------------------------------
89	*
90	* TclSetPreInitScript --
91	*
92	* This routine is used to change the value of the internal
93	* variable, tclPreInitScript.
94	*
95	* Results:
96	* Returns the current value of tclPreInitScript.
97	*
98	* Side effects:
99	* Changes the way Tcl_Init() routine behaves.
100	*
101	*----------------------------------------------------------------------
102	*/
103
104	char *
105	TclSetPreInitScript (string)
106	char string; / Pointer to a script. */
107	{
108	char *prevString = tclPreInitScript;
109	tclPreInitScript = string;
110	return(prevString);
111	}
112
113	/* End of tclinitscript.h */