mirror of
https://github.com/Relintai/pandemonium_engine_minimal.git
synced 2024-11-10 20:12:10 +01:00
170 lines
4.2 KiB
C++
170 lines
4.2 KiB
C++
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// linux_input.h
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/*
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* FRT - A Godot platform targeting single board computers
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* Copyright (c) 2017-2019 Emanuele Fornara
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <linux/input.h>
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namespace frt {
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static const char *dev_input_id_dir = "/dev/input/by-id";
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enum KeyValue { KV_Released,
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KV_Pressed,
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KV_Repeated };
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class LinuxInput {
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private:
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int fd;
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bool grabbed;
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bool find_by_name(char *buf, int size, const char *name) {
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const char *s_name = "N: Name=\"";
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const char *s_handlers = "H: Handlers=";
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const char *s_event = "event";
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FILE *f = fopen("/proc/bus/input/devices", "r");
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if (!f)
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return false;
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char s[1024];
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bool found = false;
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int state = 0, nn = strlen(name), ns;
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while (fgets(s, sizeof(s), f) && !found) {
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switch (state) {
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case 0:
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if (!strncmp(s_name, s, strlen(s_name))) {
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ns = strlen(s);
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if (((int)(ns - strlen(s_name) - strlen("\"\n")) == nn)
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&& !memcmp(&s[strlen(s_name)], name, nn))
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state = 1;
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}
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break;
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case 1:
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if (!strncmp(s_handlers, s, strlen(s_handlers))) {
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state = 0;
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char *event = strstr(s, s_event);
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if (!event)
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break;
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int id = atoi(event + strlen(s_event));
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snprintf(buf, size, "/dev/input/event%d", id);
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found = true;
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}
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break;
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}
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}
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fclose(f);
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return found;
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}
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bool open_file(const char *file_name) {
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fd = ::open(file_name, O_RDONLY | O_NONBLOCK);
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if (fd == -1)
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return false;
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return true;
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}
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bool parse_dir(const char *pattern, char *buf, int size) {
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bool found = false;
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DIR *dirp = opendir(dev_input_id_dir);
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if (!dirp)
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return false;
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while (1) {
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struct dirent *dp;
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if (!(dp = readdir(dirp)))
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break;
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const char *id = dp->d_name;
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if (strstr(id, pattern)) {
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snprintf(buf, size, "%s/%s", dev_input_id_dir, id);
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buf[size - 1] = '\0';
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found = true;
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break;
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}
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}
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closedir(dirp);
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return found;
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}
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bool open_by_id_substr(const char *substr) {
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char buf[512];
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if (!parse_dir(substr, buf, sizeof(buf)))
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return false;
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return open_file(buf);
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}
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protected:
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LinuxInput()
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: fd(-1), grabbed(false) {}
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bool open(const char *env_tag, const char *substr) {
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char *id = getenv(env_tag);
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if (id) {
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char buf[512];
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const char *s = 0;
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if (id[0] == '/')
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s = id;
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else if (find_by_name(buf, sizeof(buf), id))
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s = buf;
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if (s)
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return open_file(s);
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} else {
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return open_by_id_substr(substr);
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}
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return false;
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}
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bool grab(bool grab, int wait_ms) {
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/*
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HACK to let other clients get release keys at startup
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TODO: better handling
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*/
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if (this->grabbed == grab)
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return true;
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usleep(wait_ms * 1000);
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if (ioctl(fd, EVIOCGRAB, grab ? 1 : 0))
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return false;
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this->grabbed = grab;
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return true;
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}
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void close() {
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if (fd != -1) {
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::close(fd);
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fd = -1;
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}
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}
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bool poll() {
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input_event events[64];
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while (1) {
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int bytes = read(fd, events, sizeof(events));
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if (bytes <= 0)
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return false;
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int n = bytes / sizeof(input_event);
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for (int i = 0; i < n; i++)
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handle(events[i]);
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}
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}
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// LinuxInput
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virtual void handle(const input_event &ev) = 0;
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};
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} // namespace frt
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