/[dtapublic]/projs/trunk/shared_source/c_tcl_base_7_5_w_mods/tclinitscript.h
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Revision 71 - (hide annotations) (download)
Sat Nov 5 11:07:06 2016 UTC (7 years, 3 months ago) by dashley
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1 dashley 71 /* $Header$ */
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 */

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