mirror of https://github.com/neutrinolabs/xrdp
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
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/**
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* Copyright (C) 2024 Matt Burt, all xrdp contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file common/scancode.h
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* @brief Scancode handling
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*
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* Convert between RDP scancodes and X11 keycodes.
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*
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* RDP scancodes are largely the same as Windows scancodes. These are
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* indirectly documented in the Microsoft "Keyboard Scan Code Specification",
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* Rev 1.3a (March 16th 2000) and are otherwise known as "Scan code set
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* 1" scancodes. This document no longer appears to be available directly from
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* the Microsoft website.
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*
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* X11 keycodes are the X11 equivalent of RDP scancodes. In general, these
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* are specific to an X server. In practice however, these are nowadays
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* handled by the XKB extension and only two sets are in common use:-
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* - evdev : Linux, FreeBSD and possibly others
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* - base : Everything else.
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*
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* This module presents a single source of truth for conversions between
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* RDP scancodes and X11 keycodes.
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*/
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#if !defined(SCANCODE_H)
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#define SCANCODE_H
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/**
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* Looks up an RDP scancode
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*
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* @param scancode Scancode. Extended scancodes have bit 9 set
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* (i.e. are in 0x100 - 0x1ff)
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* @return keycode, or 0 for no keycode
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*/
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unsigned short
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scancode_to_keycode(unsigned short scancode);
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/**
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* Gets the next valid scancode from the list of valid scancodes
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* @param iter Value (initialised to zero), used to iterate
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* over available scancodes.
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* @return Next valid scancode, or zero.
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*
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* The iterator is updated on a successful call. Use like this:-
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*
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* iter = 0;
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* while ((scancode = scancode_get_next(&iter)) != 0)
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* {
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* . . .
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* }
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*/
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unsigned short
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scancode_get_next(unsigned int *iter);
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/**
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* Sets the keycode set used for the scancode translation
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*
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* @param kk_set "evdev", "base", or something more
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* complex (e.g. "evdev+aliases(qwerty)")
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* @result 0 for success
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*/
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int
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scancode_set_keycode_set(const char *kk_set);
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/**
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* Gets the keycode set used for the scancode translation
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*
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* @result "evdev", or "base"
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*/
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const char *
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scancode_get_keycode_set(void);
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#endif /* SCANCODE_H */
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