tclunixinit.c

tcl是工具命令语言

	else {
	    fprintf(stderr, "setlocale returned NULL\n");
	}
#endif
#endif /* HAVE_LANGINFO */

	if (setSysEncCode != TCL_OK) {
	    /*
	     * Classic fallback check.  This tries a homebrew algorithm to
	     * determine what encoding should be used based on env vars.
	     */
	    char *langEnv = getenv("LC_ALL");
	    encoding = NULL;

	    if (langEnv == NULL || langEnv[0] == '\0') {
		langEnv = getenv("LC_CTYPE");
	    }
	    if (langEnv == NULL || langEnv[0] == '\0') {
		langEnv = getenv("LANG");
	    }
	    if (langEnv == NULL || langEnv[0] == '\0') {
		langEnv = NULL;
	    }

	    if (langEnv != NULL) {
		for (i = 0; localeTable[i].lang != NULL; i++) {
		    if (strcmp(localeTable[i].lang, langEnv) == 0) {
			encoding = localeTable[i].encoding;
			break;
		    }
		}
		/*
		 * There was no mapping in the locale table.  If there is an
		 * encoding subfield, we can try to guess from that.
		 */

		if (encoding == NULL) {
		    char *p;
		    for (p = langEnv; *p != '\0'; p++) {
			if (*p == '.') {
			    p++;
			    break;
			}
		    }
		    if (*p != '\0') {
			Tcl_DString ds;
			Tcl_DStringInit(&ds);
			encoding = Tcl_DStringAppend(&ds, p, -1);

			Tcl_UtfToLower(Tcl_DStringValue(&ds));
			setSysEncCode = Tcl_SetSystemEncoding(NULL, encoding);
			if (setSysEncCode != TCL_OK) {
			    encoding = NULL;
			}
			Tcl_DStringFree(&ds);
		    }
		}
#ifdef HAVE_LANGINFO_DEBUG
		fprintf(stderr, "encoding fallback check '%s' => '%s'\n",
			langEnv, encoding);
#endif
	    }
	    if (setSysEncCode != TCL_OK) {
		if (encoding == NULL) {
		    encoding = TCL_DEFAULT_ENCODING;
		}

		Tcl_SetSystemEncoding(NULL, encoding);
	    }

	    /*
	     * Initialize the C library's locale subsystem.  This is required
	     * for input methods to work properly on X11.  We only do this for
	     * LC_CTYPE because that's the necessary one, and we don't want to
	     * affect LC_TIME here.  The side effect of setting the default
	     * locale should be to load any locale specific modules that are
	     * needed by X.  [BUG: 5422 3345 4236 2522 2521].
	     * In HAVE_LANGINFO, this call is already done above.
	     */
#ifndef HAVE_LANGINFO
	    setlocale(LC_CTYPE, "");
#endif
	}

	/*
	 * In case the initial locale is not "C", ensure that the numeric
	 * processing is done in "C" locale regardless.  This is needed because
	 * Tcl relies on routines like strtod, but should not have locale
	 * dependent behavior.
	 */

	setlocale(LC_NUMERIC, "C");

	/*
	 * Until the system encoding was actually set, the library path was
	 * actually in the native multi-byte encoding, and not really UTF-8
	 * as advertised.  We cheated as follows:
	 *
	 * 1. It was safe to allow the Tcl_SetSystemEncoding() call to 
	 * append the ASCII chars that make up the encoding's filename to 
	 * the names (in the native encoding) of directories in the library 
	 * path, since all Unix multi-byte encodings have ASCII in the
	 * beginning.
	 *
	 * 2. To open the encoding file, the native bytes in the file name
	 * were passed to the OS, without translating from UTF-8 to native,
	 * because the name was already in the native encoding.
	 *
	 * Now that the system encoding was actually successfully set,
	 * translate all the names in the library path to UTF-8.  That way,
	 * next time we search the library path, we'll translate the names 
	 * from UTF-8 to the system encoding which will be the native 
	 * encoding.
	 */

	pathPtr = TclGetLibraryPath();
	if (pathPtr != NULL) {
	    int objc;
	    Tcl_Obj **objv;
	    
	    objc = 0;
	    Tcl_ListObjGetElements(NULL, pathPtr, &objc, &objv);
	    for (i = 0; i < objc; i++) {
		int length;
		char *string;
		Tcl_DString ds;

		string = Tcl_GetStringFromObj(objv[i], &length);
		Tcl_ExternalToUtfDString(NULL, string, length, &ds);
		Tcl_SetStringObj(objv[i], Tcl_DStringValue(&ds), 
			Tcl_DStringLength(&ds));
		Tcl_DStringFree(&ds);
	    }
	}

	libraryPathEncodingFixed = 1;
    }
    
    /* This is only ever called from the startup thread */
    if (binaryEncoding == NULL) {
	/*
	 * Keep the iso8859-1 encoding preloaded.  The IO package uses
	 * it for gets on a binary channel.
	 */
	binaryEncoding = Tcl_GetEncoding(NULL, "iso8859-1");
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpSetVariables --
 *
 *	Performs platform-specific interpreter initialization related to
 *	the tcl_library and tcl_platform variables, and other platform-
 *	specific things.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Sets "tclDefaultLibrary", "tcl_pkgPath", and "tcl_platform" Tcl
 *	variables.
 *
 *----------------------------------------------------------------------
 */

void
TclpSetVariables(interp)
    Tcl_Interp *interp;
{
#ifndef NO_UNAME
    struct utsname name;
#endif
    int unameOK;
    CONST char *user;
    Tcl_DString ds;

#ifdef HAVE_CFBUNDLE
    char tclLibPath[MAXPATHLEN + 1];
    
    if (Tcl_MacOSXGetLibraryPath(interp, MAXPATHLEN, tclLibPath) == TCL_OK) {
        CONST char *str;
        Tcl_DString ds;
        CFBundleRef bundleRef;

        Tcl_SetVar(interp, "tclDefaultLibrary", tclLibPath, 
                TCL_GLOBAL_ONLY);
        Tcl_SetVar(interp, "tcl_pkgPath", tclLibPath,
                TCL_GLOBAL_ONLY);
        Tcl_SetVar(interp, "tcl_pkgPath", " ",
                TCL_GLOBAL_ONLY | TCL_APPEND_VALUE);
        str = TclGetEnv("DYLD_FRAMEWORK_PATH", &ds);
        if ((str != NULL) && (str[0] != '\0')) {
            char *p = Tcl_DStringValue(&ds);
            /* convert DYLD_FRAMEWORK_PATH from colon to space separated */
            do {
                if(*p == ':') *p = ' ';
            } while (*p++);
            Tcl_SetVar(interp, "tcl_pkgPath", Tcl_DStringValue(&ds),
                    TCL_GLOBAL_ONLY | TCL_APPEND_VALUE);
            Tcl_SetVar(interp, "tcl_pkgPath", " ",
                    TCL_GLOBAL_ONLY | TCL_APPEND_VALUE);
            Tcl_DStringFree(&ds);
        }
        if ((bundleRef = CFBundleGetMainBundle())) {
            CFURLRef frameworksURL;
            Tcl_StatBuf statBuf;
            if((frameworksURL = CFBundleCopyPrivateFrameworksURL(bundleRef))) {
                if(CFURLGetFileSystemRepresentation(frameworksURL, TRUE,
                            tclLibPath, MAXPATHLEN) &&
                        ! TclOSstat(tclLibPath, &statBuf) &&
                        S_ISDIR(statBuf.st_mode)) {
                    Tcl_SetVar(interp, "tcl_pkgPath", tclLibPath,
                            TCL_GLOBAL_ONLY | TCL_APPEND_VALUE);
                    Tcl_SetVar(interp, "tcl_pkgPath", " ",
                            TCL_GLOBAL_ONLY | TCL_APPEND_VALUE);
                }
                CFRelease(frameworksURL);
            }
            if((frameworksURL = CFBundleCopySharedFrameworksURL(bundleRef))) {
                if(CFURLGetFileSystemRepresentation(frameworksURL, TRUE,
                            tclLibPath, MAXPATHLEN) &&
                        ! TclOSstat(tclLibPath, &statBuf) &&
                        S_ISDIR(statBuf.st_mode)) {
                    Tcl_SetVar(interp, "tcl_pkgPath", tclLibPath,
                            TCL_GLOBAL_ONLY | TCL_APPEND_VALUE);
                    Tcl_SetVar(interp, "tcl_pkgPath", " ",
                            TCL_GLOBAL_ONLY | TCL_APPEND_VALUE);
                }
                CFRelease(frameworksURL);
            }
        }
        Tcl_SetVar(interp, "tcl_pkgPath", pkgPath,
                TCL_GLOBAL_ONLY | TCL_APPEND_VALUE);
    } else
#endif /* HAVE_CFBUNDLE */
    {
        Tcl_SetVar(interp, "tclDefaultLibrary", defaultLibraryDir, 
                TCL_GLOBAL_ONLY);
        Tcl_SetVar(interp, "tcl_pkgPath", pkgPath, TCL_GLOBAL_ONLY);
    }

#ifdef DJGPP
    Tcl_SetVar2(interp, "tcl_platform", "platform", "dos", TCL_GLOBAL_ONLY);
#else
    Tcl_SetVar2(interp, "tcl_platform", "platform", "unix", TCL_GLOBAL_ONLY);
#endif
    unameOK = 0;
#ifndef NO_UNAME
    if (uname(&name) >= 0) {
	CONST char *native;
	
	unameOK = 1;

	native = Tcl_ExternalToUtfDString(NULL, name.sysname, -1, &ds);
	Tcl_SetVar2(interp, "tcl_platform", "os", native, TCL_GLOBAL_ONLY);
	Tcl_DStringFree(&ds);
	
	/*
	 * The following code is a special hack to handle differences in
	 * the way version information is returned by uname.  On most
	 * systems the full version number is available in name.release.
	 * However, under AIX the major version number is in
	 * name.version and the minor version number is in name.release.
	 */

	if ((strchr(name.release, '.') != NULL)
		|| !isdigit(UCHAR(name.version[0]))) {	/* INTL: digit */
	    Tcl_SetVar2(interp, "tcl_platform", "osVersion", name.release,
		    TCL_GLOBAL_ONLY);
	} else {
	    Tcl_SetVar2(interp, "tcl_platform", "osVersion", name.version,
		    TCL_GLOBAL_ONLY);
	    Tcl_SetVar2(interp, "tcl_platform", "osVersion", ".",
		    TCL_GLOBAL_ONLY|TCL_APPEND_VALUE);
	    Tcl_SetVar2(interp, "tcl_platform", "osVersion", name.release,
		    TCL_GLOBAL_ONLY|TCL_APPEND_VALUE);
	}
	Tcl_SetVar2(interp, "tcl_platform", "machine", name.machine,
		TCL_GLOBAL_ONLY);
    }
#endif
    if (!unameOK) {
	Tcl_SetVar2(interp, "tcl_platform", "os", "", TCL_GLOBAL_ONLY);
	Tcl_SetVar2(interp, "tcl_platform", "osVersion", "", TCL_GLOBAL_ONLY);
	Tcl_SetVar2(interp, "tcl_platform", "machine", "", TCL_GLOBAL_ONLY);
    }

    /*
     * Copy USER or LOGNAME environment variable into tcl_platform(user)
     */

    Tcl_DStringInit(&ds);
    user = TclGetEnv("USER", &ds);
    if (user == NULL) {
	user = TclGetEnv("LOGNAME", &ds);
	if (user == NULL) {
	    user = "";
	}
    }
    Tcl_SetVar2(interp, "tcl_platform", "user", user, TCL_GLOBAL_ONLY);
    Tcl_DStringFree(&ds);

}

/*
 *----------------------------------------------------------------------
 *
 * TclpFindVariable --
 *
 *	Locate the entry in environ for a given name.  On Unix this 
 *	routine is case sensetive, on Windows this matches mixed case.
 *
 * Results:
 *	The return value is the index in environ of an entry with the
 *	name "name", or -1 if there is no such entry.   The integer at
 *	*lengthPtr is filled in with the length of name (if a matching
 *	entry is found) or the length of the environ array (if no matching
 *	entry is found).
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TclpFindVariable(name, lengthPtr)
    CONST char *name;		/* Name of desired environment variable
				 * (native). */
    int *lengthPtr;		/* Used to return length of name (for
				 * successful searches) or number of non-NULL
				 * entries in environ (for unsuccessful
				 * searches). */
{
    int i, result = -1;
    register CONST char *env, *p1, *p2;
    Tcl_DString envString;

    Tcl_DStringInit(&envString);
    for (i = 0, env = environ[i]; env != NULL; i++, env = environ[i]) {
	p1 = Tcl_ExternalToUtfDString(NULL, env, -1, &envString);
	p2 = name;

	for (; *p2 == *p1; p1++, p2++) {
	    /* NULL loop body. */
	}
	if ((*p1 == '=') && (*p2 == '\0')) {
	    *lengthPtr = p2 - name;
	    result = i;
	    goto done;
	}
	
	Tcl_DStringFree(&envString);
    }
    
    *lengthPtr = i;

    done:
    Tcl_DStringFree(&envString);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_Init --
 *
 *	This procedure is typically invoked by Tcl_AppInit procedures
 *	to find and source the "init.tcl" script, which should exist
 *	somewhere on the Tcl library path.
 *
 * Results:
 *	Returns a standard Tcl completion code and sets the interp's
 *	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. */
{
    Tcl_Obj *pathPtr;

    if (tclPreInitScript != NULL) {
	if (Tcl_Eval(interp, tclPreInitScript) == TCL_ERROR) {
	    return (TCL_ERROR);
	};
    }
    
    pathPtr = TclGetLibraryPath();
    if (pathPtr == NULL) {
	pathPtr = Tcl_NewObj();
    }
    Tcl_SetVar2Ex(interp, "tcl_libPath", NULL, pathPtr, TCL_GLOBAL_ONLY);
    return Tcl_Eval(interp, initScript);
}

/*
 *----------------------------------------------------------------------
 *
 * 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;
    CONST char *fileName;
    Tcl_Channel errChannel;

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

    if (fileName != NULL) {
        Tcl_Channel c;
	CONST 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_WriteObj(errChannel, Tcl_GetObjResult(interp));
			Tcl_WriteChars(errChannel, "\n", 1);
		    }
		}
	    }
	}
        Tcl_DStringFree(&temp);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclpCheckStackSpace --
 *
 *	Detect if we are about to blow the stack.  Called before an 
 *	evaluation can happen when nesting depth is checked.
 *
 * Results:
 *	1 if there is enough stack space to continue; 0 if not.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TclpCheckStackSpace()
{
    /*
     * This function is unimplemented on Unix platforms.
     */

    return 1;
}

#ifdef HAVE_CFBUNDLE
/*
 *----------------------------------------------------------------------
 *
 * Tcl_MacOSXGetLibraryPath --
 *
 *	If we have a bundle structure for the Tcl installation,
 *	then check there first to see if we can find the libraries
 *	there.
 *
 * Results:
 *	TCL_OK if we have found the tcl library; TCL_ERROR otherwise.
 *
 * Side effects:
 *	Same as for Tcl_MacOSXOpenBundleResources.
 *
 *----------------------------------------------------------------------
 */
static int Tcl_MacOSXGetLibraryPath(Tcl_Interp *interp, int maxPathLen, char *tclLibPath)
{
    int foundInFramework = TCL_ERROR;
    if (strcmp(defaultLibraryDir, "@TCL_IN_FRAMEWORK@") == 0) {
	foundInFramework = Tcl_MacOSXOpenBundleResources(interp, 
	    "com.tcltk.tcllibrary", 0, maxPathLen, tclLibPath);
    }
    return foundInFramework;
}
#endif /* HAVE_CFBUNDLE */