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Diffstat (limited to 'libfreerdp/locale/keyboard_x11.c')
| -rw-r--r-- | libfreerdp/locale/keyboard_x11.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/libfreerdp/locale/keyboard_x11.c b/libfreerdp/locale/keyboard_x11.c new file mode 100644 index 0000000..3f3f574 --- /dev/null +++ b/libfreerdp/locale/keyboard_x11.c @@ -0,0 +1,139 @@ +/** + * FreeRDP: A Remote Desktop Protocol Implementation + * X11 Keyboard Mapping + * + * Copyright 2009-2012 Marc-Andre Moreau <marcandre.moreau@gmail.com> + * Copyright 2023 Bernhard Miklautz <bernhard.miklautz@thincast.com> + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <string.h> + +#include <X11/X.h> +#include <X11/Xatom.h> +#include <X11/Xlib.h> + +#include "liblocale.h" +#include "keyboard_x11.h" +#include "xkb_layout_ids.h" + +static BOOL parse_xkb_rule_names(char* xkb_rule, unsigned long num_bytes, char** layout, + char** variant) +{ + /* Sample output for "Canadian Multilingual Standard" + * + * _XKB_RULES_NAMES_BACKUP(STRING) = "xorg", "pc105", "ca", "multi", "magic" + * + * Format: "rules", "model", "layout", "variant", "options" + * + * Where "xorg" is the set of rules + * "pc105" the keyboard model + * "ca" the keyboard layout(s) (can also be something like 'us,uk') + * "multi" the keyboard layout variant(s) (in the examples, “,winkeys” - which means first + * layout uses some “default” variant and second uses “winkeys” variant) + * "magic" - configuration option (in the examples, + * “eurosign:e,lv3:ralt_switch,grp:rctrl_toggle” + * - three options) + */ + for (size_t i = 0, index = 0; i < num_bytes; i++, index++) + { + char* ptr = xkb_rule + i; + + switch (index) + { + case 0: // rules + break; + case 1: // model + break; + case 2: // layout + { + /* If multiple languages are present we just take the first one */ + char* delimiter = strchr(ptr, ','); + if (delimiter) + *delimiter = '\0'; + *layout = ptr; + break; + } + case 3: // variant + *variant = ptr; + break; + case 4: // option + break; + default: + break; + } + i += strlen(ptr); + } + return TRUE; +} + +static DWORD kbd_layout_id_from_x_property(Display* display, Window root, char* property_name) +{ + char* layout = NULL; + char* variant = NULL; + char* rule = NULL; + Atom property = None; + Atom type = None; + int item_size = 0; + unsigned long items = 0; + unsigned long unread_items = 0; + DWORD layout_id = 0; + + property = XInternAtom(display, property_name, False); + + if (XGetWindowProperty(display, root, property, 0, 1024, False, XA_STRING, &type, &item_size, + &items, &unread_items, (unsigned char**)&rule) != Success) + { + return 0; + } + + if (type != XA_STRING || item_size != 8 || unread_items != 0) + { + XFree(rule); + return 0; + } + + parse_xkb_rule_names(rule, items, &layout, &variant); + + DEBUG_KBD("%s layout: %s, variant: %s", property_name, layout, variant); + layout_id = find_keyboard_layout_in_xorg_rules(layout, variant); + + XFree(rule); + + return layout_id; +} + +int freerdp_detect_keyboard_layout_from_xkb(DWORD* keyboardLayoutId) +{ + Display* display = XOpenDisplay(NULL); + + if (!display) + return 0; + + Window root = DefaultRootWindow(display); + if (!root) + return 0; + + /* We start by looking for _XKB_RULES_NAMES_BACKUP which appears to be used by libxklavier */ + DWORD id = kbd_layout_id_from_x_property(display, root, "_XKB_RULES_NAMES_BACKUP"); + + if (0 == id) + id = kbd_layout_id_from_x_property(display, root, "_XKB_RULES_NAMES"); + + if (0 != id) + *keyboardLayoutId = id; + + XCloseDisplay(display); + return (int)id; +} |