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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/* Standard errors */
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#include <errno.h>
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/* Directory and file control */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <unistd.h>
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#ifdef __linux__
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#include <linux/input.h>
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#endif
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#ifdef __FreeBSD__
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#include <dev/evdev/input.h>
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#endif
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struct pressed_buffer {
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unsigned short *buf;
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unsigned int size;
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};
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int pressBufferAdd (struct pressed_buffer*, unsigned short);
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int pressBufferRemove (struct pressed_buffer*, unsigned short);
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int main (void) // remember getopt() to automaically parse options
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{
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int fd;
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fd = open("/dev/input/event0", O_RDONLY); // TEST: O_NONBLOCK
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if (!fd) {
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fputs(strerror(errno), stderr);
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exit(errno);
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}
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//int f2 = open("/dev/input/event3", O_RDONLY);
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//struct input_event ev;
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struct input_event event;
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struct pressed_buffer pb = {NULL, 0}; // Pressed keys buffer
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while (1) {
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/* Use polling poll(2) to wait por a file dscriptor to become ready for reading.
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* NOTE: this could use select(2) but I don't know how */
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//fread(&event, sizeof(struct input_event), 1, fp);
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ssize_t rb;
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rb = read(fd, &event, sizeof(struct input_event));
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if (rb != sizeof(struct input_event)) continue;
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if (event.type == EV_KEY) {
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switch (event.value) {
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case (0): // Key release
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pressBufferRemove(&pb, event.code);
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break;
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case (1): // Key press
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pressBufferAdd(&pb, event.code);
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break;
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}
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printf("Pressed keys: ");
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for (int i = 0; i < pb.size; i++)
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printf("%d ", pb.buf[i]);
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putchar('\n');
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}
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}
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if (close(fd) == -1) {
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fputs(strerror(errno), stderr);
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exit(errno);
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}
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return 0;
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}
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int pressBufferAdd (struct pressed_buffer *pb, unsigned short key)
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{
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/* Adds a keycode to the pressed buffer if it is not already present
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* Returns non zero if the key was not added. */
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if (!pb) return 1;
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if (pb->buf != NULL) {
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/* Linear search if the key is already buffered */
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for (int i = 0; i < pb->size; i++)
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if (key == pb->buf[i]) return 1;
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}
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unsigned short *b;
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b = realloc(pb->buf, sizeof(unsigned short) * pb->size + 1);
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if (!b) {
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fprintf(stderr, "realloc failed in pressBufferAdd: %s", strerror(errno));
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exit(errno);
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}
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pb->buf = b;
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pb->buf[pb->size++] = key;
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return 0;
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}
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int pressBufferRemove (struct pressed_buffer *pb, unsigned short key)
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{
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/* Removes a keycode from a pressed buffer if it is present returns
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* non zero in case of failure (key not present or buffer empty). */
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if (!pb) return 1;
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for (int i = 0; i < pb->size; i++) {
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if (pb->buf[i] == key) {
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pb->size--;
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pb->buf[i] = pb->buf[pb->size];
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unsigned short *b;
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b = realloc(pb->buf, sizeof(unsigned short) * pb->size);
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if (!b && pb->size) {
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fprintf(stderr, "realloc failed in pressBufferRemove: %s",
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strerror(errno));
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exit(errno);
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}
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pb->buf = b;
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return 0;
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}
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}
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return 1;
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}
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