tclwinreg.c

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 *	pattern will be returned.
 *
 * Results:
 *	Returns the list of subkeys in the result object of the
 *	interpreter, or an error message on failure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetKeyNames(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Key to enumerate. */
    Tcl_Obj *patternObj)	/* Optional match pattern. */
{
    HKEY key;
    DWORD index;
    char buffer[MAX_PATH+1], *pattern, *name;
    Tcl_Obj *resultPtr;
    int result = TCL_OK;
    Tcl_DString ds;

    /*
     * Attempt to open the key for enumeration.
     */

    if (OpenKey(interp, keyNameObj, KEY_ENUMERATE_SUB_KEYS, 0, &key)
	    != TCL_OK) {
	return TCL_ERROR;
    }

    if (patternObj) {
	pattern = Tcl_GetString(patternObj);
    } else {
	pattern = NULL;
    }

    /*
     * Enumerate over the subkeys until we get an error, indicating the
     * end of the list.
     */

    resultPtr = Tcl_GetObjResult(interp);
    for (index = 0; (*regWinProcs->regEnumKeyProc)(key, index, buffer,
	    MAX_PATH+1) == ERROR_SUCCESS; index++) {
	Tcl_WinTCharToUtf((TCHAR *) buffer, -1, &ds);
	name = Tcl_DStringValue(&ds);
	if (pattern && !Tcl_StringMatch(name, pattern)) {
	    Tcl_DStringFree(&ds);
	    continue;
	}
	result = Tcl_ListObjAppendElement(interp, resultPtr,
		Tcl_NewStringObj(name, Tcl_DStringLength(&ds)));
	Tcl_DStringFree(&ds);
	if (result != TCL_OK) {
	    break;
	}
    }

    RegCloseKey(key);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * GetType --
 *
 *	This function gets the type of a given registry value and
 *	places it in the interpreter result.
 *
 * Results:
 *	Returns a normal Tcl result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetType(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Name of key. */
    Tcl_Obj *valueNameObj)	/* Name of value to get. */
{
    HKEY key;
    Tcl_Obj *resultPtr;
    DWORD result;
    DWORD type;
    Tcl_DString ds;
    char *valueName;
    CONST char *nativeValue;
    int length;

    /*
     * Attempt to open the key for reading.
     */

    if (OpenKey(interp, keyNameObj, KEY_QUERY_VALUE, 0, &key)
	    != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Get the type of the value.
     */

    resultPtr = Tcl_GetObjResult(interp);

    valueName = Tcl_GetStringFromObj(valueNameObj, &length);
    nativeValue = Tcl_WinUtfToTChar(valueName, length, &ds);
    result = (*regWinProcs->regQueryValueExProc)(key, nativeValue, NULL, &type,
	    NULL, NULL);
    Tcl_DStringFree(&ds);
    RegCloseKey(key);

    if (result != ERROR_SUCCESS) {
	Tcl_AppendStringsToObj(resultPtr, "unable to get type of value \"",
		Tcl_GetString(valueNameObj), "\" from key \"",
		Tcl_GetString(keyNameObj), "\": ", NULL);
	AppendSystemError(interp, result);
	return TCL_ERROR;
    }

    /*
     * Set the type into the result.  Watch out for unknown types.
     * If we don't know about the type, just use the numeric value.
     */

    if (type > lastType || type < 0) {
	Tcl_SetIntObj(resultPtr, (int) type);
    } else {
	Tcl_SetStringObj(resultPtr, typeNames[type], -1);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetValue --
 *
 *	This function gets the contents of a registry value and places
 *	a list containing the data and the type in the interpreter
 *	result.
 *
 * Results:
 *	Returns a normal Tcl result.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetValue(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Name of key. */
    Tcl_Obj *valueNameObj)	/* Name of value to get. */
{
    HKEY key;
    char *valueName;
    CONST char *nativeValue;
    DWORD result, length, type;
    Tcl_Obj *resultPtr;
    Tcl_DString data, buf;
    int nameLen;

    /*
     * Attempt to open the key for reading.
     */

    if (OpenKey(interp, keyNameObj, KEY_QUERY_VALUE, 0, &key)
	    != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Initialize a Dstring to maximum statically allocated size
     * we could get one more byte by avoiding Tcl_DStringSetLength()
     * and just setting length to TCL_DSTRING_STATIC_SIZE, but this
     * should be safer if the implementation of Dstrings changes.
     *
     * This allows short values to be read from the registy in one call.
     * Longer values need a second call with an expanded DString.
     */

    Tcl_DStringInit(&data);
    length = TCL_DSTRING_STATIC_SIZE - 1;
    Tcl_DStringSetLength(&data, (int) length);

    resultPtr = Tcl_GetObjResult(interp);

    valueName = Tcl_GetStringFromObj(valueNameObj, &nameLen);
    nativeValue = Tcl_WinUtfToTChar(valueName, nameLen, &buf);

    result = (*regWinProcs->regQueryValueExProc)(key, nativeValue, NULL, &type,
	    (BYTE *) Tcl_DStringValue(&data), &length);
    while (result == ERROR_MORE_DATA) {
	/*
	 * The Windows docs say that in this error case, we just need
	 * to expand our buffer and request more data.
	 * Required for HKEY_PERFORMANCE_DATA
	 */
	length *= 2;
        Tcl_DStringSetLength(&data, (int) length);
        result = (*regWinProcs->regQueryValueExProc)(key, (char *) nativeValue,
		NULL, &type, (BYTE *) Tcl_DStringValue(&data), &length);
    }
    Tcl_DStringFree(&buf);
    RegCloseKey(key);
    if (result != ERROR_SUCCESS) {
	Tcl_AppendStringsToObj(resultPtr, "unable to get value \"",
		Tcl_GetString(valueNameObj), "\" from key \"",
		Tcl_GetString(keyNameObj), "\": ", NULL);
	AppendSystemError(interp, result);
	Tcl_DStringFree(&data);
	return TCL_ERROR;
    }

    /*
     * If the data is a 32-bit quantity, store it as an integer object.  If it
     * is a multi-string, store it as a list of strings.  For null-terminated
     * strings, append up the to first null.  Otherwise, store it as a binary
     * string.
     */

    if (type == REG_DWORD || type == REG_DWORD_BIG_ENDIAN) {
	Tcl_SetIntObj(resultPtr, (int) ConvertDWORD(type,
		*((DWORD*) Tcl_DStringValue(&data))));
    } else if (type == REG_MULTI_SZ) {
	char *p = Tcl_DStringValue(&data);
	char *end = Tcl_DStringValue(&data) + length;

	/*
	 * Multistrings are stored as an array of null-terminated strings,
	 * terminated by two null characters.  Also do a bounds check in
	 * case we get bogus data.
	 */
 
	while (p < end 	&& ((regWinProcs->useWide) 
		? *((Tcl_UniChar *)p) : *p) != 0) {
	    Tcl_WinTCharToUtf((TCHAR *) p, -1, &buf);
	    Tcl_ListObjAppendElement(interp, resultPtr,
		    Tcl_NewStringObj(Tcl_DStringValue(&buf),
			    Tcl_DStringLength(&buf)));
	    if (regWinProcs->useWide) {
		while (*((Tcl_UniChar *)p)++ != 0) {}
	    } else {
		while (*p++ != '\0') {}
	    }
	    Tcl_DStringFree(&buf);
	}
    } else if ((type == REG_SZ) || (type == REG_EXPAND_SZ)) {
	Tcl_WinTCharToUtf((TCHAR *) Tcl_DStringValue(&data), -1, &buf);
	Tcl_SetStringObj(resultPtr, Tcl_DStringValue(&buf),
		Tcl_DStringLength(&buf));
	Tcl_DStringFree(&buf);
    } else {
	/*
	 * Save binary data as a byte array.
	 */

	Tcl_SetByteArrayObj(resultPtr, Tcl_DStringValue(&data), (int) length);
    }
    Tcl_DStringFree(&data);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * GetValueNames --
 *
 *	This function enumerates the values of the a given key.  If
 *	the optional pattern is supplied, then only value names that
 *	match the pattern will be returned.
 *
 * Results:
 *	Returns the list of value names in the result object of the
 *	interpreter, or an error message on failure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetValueNames(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Key to enumerate. */
    Tcl_Obj *patternObj)	/* Optional match pattern. */
{
    HKEY key;
    Tcl_Obj *resultPtr;
    DWORD index, size, maxSize, result;
    Tcl_DString buffer, ds;
    char *pattern, *name;

    /*
     * Attempt to open the key for enumeration.
     */

    if (OpenKey(interp, keyNameObj, KEY_QUERY_VALUE, 0, &key)
	    != TCL_OK) {
	return TCL_ERROR;
    }

    resultPtr = Tcl_GetObjResult(interp);

    /*
     * Query the key to determine the appropriate buffer size to hold the
     * largest value name plus the terminating null.
     */

    result = (*regWinProcs->regQueryInfoKeyProc)(key, NULL, NULL, NULL, NULL,
	    NULL, NULL, &index, &maxSize, NULL, NULL, NULL);
    if (result != ERROR_SUCCESS) {
	Tcl_AppendStringsToObj(resultPtr, "unable to query key \"",
		Tcl_GetString(keyNameObj), "\": ", NULL);
	AppendSystemError(interp, result);
	RegCloseKey(key);
	result = TCL_ERROR;
	goto done;
    }
    maxSize++;


    Tcl_DStringInit(&buffer);
    Tcl_DStringSetLength(&buffer,
	    (int) ((regWinProcs->useWide) ? maxSize*2 : maxSize));
    index = 0;
    result = TCL_OK;

    if (patternObj) {
	pattern = Tcl_GetString(patternObj);
    } else {
	pattern = NULL;
    }

    /*
     * Enumerate the values under the given subkey until we get an error,
     * indicating the end of the list.  Note that we need to reset size
     * after each iteration because RegEnumValue smashes the old value.
     */

    size = maxSize;
    while ((*regWinProcs->regEnumValueProc)(key, index,
	    Tcl_DStringValue(&buffer), &size, NULL, NULL, NULL, NULL)
	    == ERROR_SUCCESS) {

	if (regWinProcs->useWide) {
	    size *= 2;
	}

	Tcl_WinTCharToUtf((TCHAR *) Tcl_DStringValue(&buffer), (int) size, &ds);
	name = Tcl_DStringValue(&ds);
	if (!pattern || Tcl_StringMatch(name, pattern)) {
	    result = Tcl_ListObjAppendElement(interp, resultPtr,
		    Tcl_NewStringObj(name, Tcl_DStringLength(&ds)));
	    if (result != TCL_OK) {
		Tcl_DStringFree(&ds);
		break;
	    }
	}
	Tcl_DStringFree(&ds);

	index++;
	size = maxSize;
    }
    Tcl_DStringFree(&buffer);

    done:
    RegCloseKey(key);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * OpenKey --
 *
 *	This function opens the specified key.  This function is a
 *	simple wrapper around ParseKeyName and OpenSubKey.
 *
 * Results:
 *	Returns the opened key in the keyPtr argument and a Tcl
 *	result code.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
OpenKey(
    Tcl_Interp *interp,		/* Current interpreter. */
    Tcl_Obj *keyNameObj,	/* Key to open. */
    REGSAM mode,		/* Access mode. */
    int flags,			/* 0 or REG_CREATE. */
    HKEY *keyPtr)		/* Returned HKEY. */
{
    char *keyName, *buffer, *hostName;
    int length;
    HKEY rootKey;
    DWORD result;

    keyName = Tcl_GetStringFromObj(keyNameObj, &length);
    buffer = ckalloc((unsigned int) length + 1);
    strcpy(buffer, keyName);

    result = ParseKeyName(interp, buffer, &hostName, &rootKey, &keyName);
    if (result == TCL_OK) {
	result = OpenSubKey(hostName, rootKey, keyName, mode, flags, keyPtr);
	if (result != ERROR_SUCCESS) {
	    Tcl_Obj *resultPtr = Tcl_GetObjResult(interp);
	    Tcl_AppendToObj(resultPtr, "unable to open key: ", -1);
	    AppendSystemError(interp, result);
	    result = TCL_ERROR;
	} else {
	    result = TCL_OK;
	}
    }

    ckfree(buffer);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * OpenSubKey --
 *
 *	This function opens a given subkey of a root key on the
 *	specified host.
 *
 * Results:
 *	Returns the opened key in the keyPtr and a Windows error code
 *	as the return value.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static DWORD
OpenSubKey(
    char *hostName,		/* Host to access, or NULL for local. */
    HKEY rootKey,		/* Root registry key. */
    char *keyName,		/* Subkey name. */
    REGSAM mode,		/* Access mode. */
    int flags,			/* 0 or REG_CREATE. */
    HKEY *keyPtr)		/* Returned HKEY. */
{
    DWORD result;
    Tcl_DString buf;

    /*
     * Attempt to open the root key on a remote host if necessary.
     */

    if (hostName) {
	hostName = (char *) Tcl_WinUtfToTChar(hostName, -1, &buf);
	result = (*regWinProcs->regConnectRegistryProc)(hostName, rootKey,
		&rootKey);
	Tcl_DStringFree(&buf);
	if (result != ERROR_SUCCESS) {
	    return result;
	}
    }

    /*
     * Now open the specified key with the requested permissions.  Note
     * that this key must be closed by the caller.
     */

    keyName = (char *) Tcl_WinUtfToTChar(keyName, -1, &buf);
    if (flags & REG_CREATE) {
	DWORD create;
	result = (*regWinProcs->regCreateKeyExProc)(rootKey, keyName, 0, "",
		REG_OPTION_NON_VOLATILE, mode, NULL, keyPtr, &create);
    } else {
	if (rootKey == HKEY_PERFORMANCE_DATA) {
	    /*
	     * Here we fudge it for this special root key.
	     * See MSDN for more info on HKEY_PERFORMANCE_DATA and
	     * the peculiarities surrounding it
	     */
	    *keyPtr = HKEY_PERFORMANCE_DATA;