/* 
 * tclWinInit.c --
 *
 *	Contains the Windows-specific interpreter initialization functions.
 *
 * Copyright (c) 1994-1996 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclWinInit.c,v 1.11 1998/10/20 17:27:47 suresh Exp $
 */

#include "tclInt.h"
#include "tclPort.h"
#include <winreg.h>
#include <winnt.h>
#include <winbase.h>

/*
 * The following macro can be defined at compile time to specify
 * the root of the Tcl registry keys.
 */
 
#ifndef TCL_REGISTRY_KEY
#define TCL_REGISTRY_KEY "Software\\Scriptics\\Tcl\\" TCL_VERSION
#endif

/*
 * The following declaration is a workaround for some Microsoft brain damage.
 * The SYSTEM_INFO structure is different in various releases, even though the
 * layout is the same.  So we overlay our own structure on top of it so we
 * can access the interesting slots in a uniform way.
 */

typedef struct {
    WORD wProcessorArchitecture;
    WORD wReserved;
} OemId;

/*
 * The following macros are missing from some versions of winnt.h.
 */

#ifndef PROCESSOR_ARCHITECTURE_INTEL
#define PROCESSOR_ARCHITECTURE_INTEL 0
#endif
#ifndef PROCESSOR_ARCHITECTURE_MIPS
#define PROCESSOR_ARCHITECTURE_MIPS  1
#endif
#ifndef PROCESSOR_ARCHITECTURE_ALPHA
#define PROCESSOR_ARCHITECTURE_ALPHA 2
#endif
#ifndef PROCESSOR_ARCHITECTURE_PPC
#define PROCESSOR_ARCHITECTURE_PPC   3
#endif
#ifndef PROCESSOR_ARCHITECTURE_UNKNOWN
#define PROCESSOR_ARCHITECTURE_UNKNOWN 0xFFFF
#endif

DWORD TclWinThreadId;

/*
 * The following arrays contain the human readable strings for the Windows
 * platform and processor values.
 */


#define NUMPLATFORMS 3
static char* platforms[NUMPLATFORMS] = {
    "Win32s", "Windows 95", "Windows NT"
};

#define NUMPROCESSORS 4
static char* processors[NUMPROCESSORS] = {
    "intel", "mips", "alpha", "ppc"
};

/*
 * The Init script, tclPreInitScript variable, and the routine
 * TclSetPreInitScript (common to Windows and Unix platforms) are defined
 * in generic/tclInitScript.h
 */

#include "tclInitScript.h"


/*
 *----------------------------------------------------------------------
 *
 * TclPlatformInit --
 *
 *	Performs Windows-specific interpreter initialization related to the
 *	tcl_library variable.  Also sets up the HOME environment variable
 *	if it is not already set.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Sets "tcl_library" and "env(HOME)" Tcl variables
 *
 *----------------------------------------------------------------------
 */

void
TclPlatformInit(interp)
    Tcl_Interp *interp;
{
    char *p;
    char buffer[13];
    Tcl_DString ds;
    OSVERSIONINFO osInfo;
    SYSTEM_INFO sysInfo;
    int isWin32s;		/* True if we are running under Win32s. */
    OemId *oemId;
    HKEY key;
    DWORD size, result, type;

    tclPlatform = TCL_PLATFORM_WINDOWS;

    Tcl_DStringInit(&ds);

    /*
     * Find out what kind of system we are running on.
     */

    osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    GetVersionEx(&osInfo);

    isWin32s = (osInfo.dwPlatformId == VER_PLATFORM_WIN32s);

    /*
     * Since Win32s doesn't support GetSystemInfo, we use a default value.
     */

    oemId = (OemId *) &sysInfo;
    if (!isWin32s) {
	GetSystemInfo(&sysInfo);
    } else {
	oemId->wProcessorArchitecture = PROCESSOR_ARCHITECTURE_INTEL;
    }

    /*
     * Initialize the tcl_library variable from the registry.
     */

    Tcl_SetVar(interp, "tclDefaultLibrary", "", TCL_GLOBAL_ONLY);
    if (!isWin32s) {
	result = RegOpenKeyEx(HKEY_LOCAL_MACHINE, TCL_REGISTRY_KEY, 0,
		KEY_READ, &key);
    } else {
	result = RegOpenKeyEx(HKEY_CLASSES_ROOT, TCL_REGISTRY_KEY, 0,
		KEY_READ, &key);
    }
    if (result == ERROR_SUCCESS) {
	if (RegQueryValueEx(key, "", NULL, NULL, NULL, &size)
		== ERROR_SUCCESS) {
	    char *argv[3];
	    Tcl_DStringSetLength(&ds, size);
	    RegQueryValueEx(key, "", NULL, NULL,
		    (LPBYTE) Tcl_DStringValue(&ds), &size);
	    Tcl_SetVar(interp, "tclDefaultLibrary", Tcl_DStringValue(&ds),
		    TCL_GLOBAL_ONLY);
	    argv[0] = Tcl_GetVar(interp, "tclDefaultLibrary", TCL_GLOBAL_ONLY);
	    argv[1] = "lib/tcl" TCL_VERSION;
	    argv[2] = NULL;
	    Tcl_DStringSetLength(&ds, 0);
	    Tcl_SetVar(interp, "tclDefaultLibrary",
		    Tcl_JoinPath(2, argv, &ds), TCL_GLOBAL_ONLY);
	}
	if ((RegQueryValueEx(key, "PkgPath", NULL, &type, NULL, &size)
		== ERROR_SUCCESS) && (type == REG_MULTI_SZ)) {
	    char **argv;
	    int argc;

	    /*
	     * PkgPath is stored as an array of null terminated strings
	     * terminated by two null characters.  First count the number
	     * of strings, then allocate an argv array so we can construct
	     * a valid list.
	     */

	    Tcl_DStringSetLength(&ds, size);
	    RegQueryValueEx(key, "PkgPath", NULL, NULL,
		    (LPBYTE)Tcl_DStringValue(&ds), &size);
	    argc = 0;
	    p = Tcl_DStringValue(&ds);
	    do {
		if (*p) {
		    argc++;
		}
		p += strlen(p) + 1;
	    } while (*p);

	    argv = (char **) ckalloc((sizeof(char *) * argc) + 1);
	    argc = 0;
	    p = Tcl_DStringValue(&ds);
	    do {
		if (*p) {
		    argv[argc++] = p;
		    while (*p) {
			if (*p == '\\') {
			    *p = '/';
			}
			p++;
		    }
		}
		p++;
	    } while (*p);

	    p = Tcl_Merge(argc, argv);
	    Tcl_SetVar(interp, "tcl_pkgPath", p, TCL_GLOBAL_ONLY);
	    ckfree(p);
	    ckfree((char*) argv);
	} else {
	    char *argv[3];
	    argv[0] = Tcl_GetVar(interp, "tclDefaultLibrary", TCL_GLOBAL_ONLY);
	    argv[1] = "..";
	    argv[2] = NULL;
	    Tcl_DStringSetLength(&ds, 0);
	    Tcl_SetVar(interp, "tcl_pkgPath", Tcl_JoinPath(2, argv, &ds),
		    TCL_GLOBAL_ONLY|TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
	}
    }

    /*
     * Define the tcl_platform array.
     */

    Tcl_SetVar2(interp, "tcl_platform", "platform", "windows",
	    TCL_GLOBAL_ONLY);
    if (osInfo.dwPlatformId < NUMPLATFORMS) {
	Tcl_SetVar2(interp, "tcl_platform", "os",
		platforms[osInfo.dwPlatformId], TCL_GLOBAL_ONLY);
    }
    sprintf(buffer, "%d.%d", osInfo.dwMajorVersion, osInfo.dwMinorVersion);
    Tcl_SetVar2(interp, "tcl_platform", "osVersion", buffer, TCL_GLOBAL_ONLY);
    if (oemId->wProcessorArchitecture < NUMPROCESSORS) {
	Tcl_SetVar2(interp, "tcl_platform", "machine",
		processors[oemId->wProcessorArchitecture],
		TCL_GLOBAL_ONLY);
    }

#ifdef _DEBUG
    /*
     * The existence of the "debug" element of the tcl_platform array indicates
     * that this particular Tcl shell has been compiled with debug information.
     * Using "info exists tcl_platform(debug)" a Tcl script can direct the 
     * interpreter to load debug versions of DLLs with the load command.
     */

    Tcl_SetVar2(interp, "tcl_platform", "debug", "1",
		TCL_GLOBAL_ONLY);
#endif

    /*
     * Set up the HOME environment variable from the HOMEDRIVE & HOMEPATH
     * environment variables, if necessary.
     */

    p = Tcl_GetVar2(interp, "env", "HOME", TCL_GLOBAL_ONLY);
    if (p == NULL) {
	Tcl_DStringSetLength(&ds, 0);
	p = Tcl_GetVar2(interp, "env", "HOMEDRIVE", TCL_GLOBAL_ONLY);
	if (p != NULL) {
	    Tcl_DStringAppend(&ds, p, -1);
	}
	p = Tcl_GetVar2(interp, "env", "HOMEPATH", TCL_GLOBAL_ONLY);
	if (p != NULL) {
	    Tcl_DStringAppend(&ds, p, -1);
	}
	if (Tcl_DStringLength(&ds) > 0) {
	    Tcl_SetVar2(interp, "env", "HOME", Tcl_DStringValue(&ds),
		    TCL_GLOBAL_ONLY);
	} else {
	    Tcl_SetVar2(interp, "env", "HOME", "c:\\", TCL_GLOBAL_ONLY);
	}
    }

    Tcl_DStringFree(&ds);
    TclWinThreadId = GetCurrentThreadId();
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_Init --
 *
 *	This procedure is typically invoked by Tcl_AppInit procedures
 *	to perform additional initialization for a Tcl interpreter,
 *	such as sourcing the "init.tcl" script.
 *
 * Results:
 *	Returns a standard Tcl completion code and sets interp->result
 *	if there is an error.
 *
 * Side effects:
 *	Depends on what's in the init.tcl script.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_Init(interp)
    Tcl_Interp *interp;		/* Interpreter to initialize. */
{
    if (tclPreInitScript != NULL) {
	if (Tcl_Eval(interp, tclPreInitScript) == TCL_ERROR) {
	    return (TCL_ERROR);
	};
    }
    if (Tcl_Eval(interp, initScript) == TCL_ERROR) {
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclWinGetPlatform --
 *
 *	This is a kludge that allows the test library to get access
 *	the internal tclPlatform variable.
 *
 * Results:
 *	Returns a pointer to the tclPlatform variable.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

TclPlatformType *
TclWinGetPlatform()
{
    return &tclPlatform;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SourceRCFile --
 *
 *	This procedure is typically invoked by Tcl_Main of Tk_Main
 *	procedure to source an application specific rc file into the
 *	interpreter at startup time.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Depends on what's in the rc script.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SourceRCFile(interp)
    Tcl_Interp *interp;		/* Interpreter to source rc file into. */
{
    Tcl_DString temp;
    char *fileName;
    Tcl_Channel errChannel;

    fileName = Tcl_GetVar(interp, "tcl_rcFileName", TCL_GLOBAL_ONLY);

    if (fileName != NULL) {
        Tcl_Channel c;
	char *fullName;

        Tcl_DStringInit(&temp);
	fullName = Tcl_TranslateFileName(interp, fileName, &temp);
	if (fullName == NULL) {
	    /*
	     * Couldn't translate the file name (e.g. it referred to a
	     * bogus user or there was no HOME environment variable).
	     * Just do nothing.
	     */
	} else {

	    /*
	     * Test for the existence of the rc file before trying to read it.
	     */

            c = Tcl_OpenFileChannel(NULL, fullName, "r", 0);
            if (c != (Tcl_Channel) NULL) {
                Tcl_Close(NULL, c);
		if (Tcl_EvalFile(interp, fullName) != TCL_OK) {
		    errChannel = Tcl_GetStdChannel(TCL_STDERR);
		    if (errChannel) {
			Tcl_Write(errChannel, Tcl_GetStringResult(interp), -1);
			Tcl_Write(errChannel, "\n", 1);
		    }
		}
	    }
	}
        Tcl_DStringFree(&temp);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclPlatformAsyncMark --
 *
 *	Process asynchronous event on Windows
 *
 * Results:
 *	None
 *
 *----------------------------------------------------------------------
 */

void
TclPlatformAsyncMark(async)
    Tcl_AsyncHandler async;		/* Token for handler. */
{
    /*
     * Need a way to kick
     * the Windows event loop and tell it to go look at asynchronous
     * events.
     */
    PostThreadMessage(TclWinThreadId, WM_USER, 0, 0);
}
