morse

commit 00f06c0f2ecfad3c26b8a3e3ea1114908a6dc8d0
Author: Louis Burda <quent.burda@gmail.com>
Date:   Mon,  3 Oct 2022 01:49:49 +0200

Initial prototype

Diffstat:
A
.gitignore
 | 
1
+
A
Makefile
 | 
10
++++++++++
A
lut.c
 | 
40
++++++++++++++++++++++++++++++++++++++++
A
morse.c
 | 
121
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 172 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+morse
diff --git a/Makefile b/Makefile
@@ -0,0 +1,10 @@
+LDLIBS = -lX11
+
+all: morse
+
+clean:
+	rm -f morse
+
+morse: morse.c
+
+.PHONY: all clean
diff --git a/lut.c b/lut.c
@@ -0,0 +1,40 @@
+static const char *morse_lut[] = {
+	"A" ".-",
+	"B" "-...",
+	"C" "-.-.",
+	"D" "-..",
+	"E" ".",
+	"F" "..-.",
+	"G" "--.",
+	"H" "....",
+	"I" "..",
+	"J" ".---",
+	"K" "-.-",
+	"L" ".-..",
+	"M" "--",
+	"N" "-.",
+	"O" "---",
+	"P" ".--.",
+	"Q" "--.-",
+	"R" ".-.",
+	"S" "...",
+	"T" "-",
+	"U" "..-",
+	"V" "...-",
+	"W" ".--",
+	"X" "-..-",
+	"Y" "-.--",
+	"Z" "--..",
+	"1" ".----",
+	"2" "..---",
+	"3" "...--",
+	"4" "....-",
+	"5" ".....",
+	"6" "-....",
+	"7" "--...",
+	"8" "---..",
+	"9" "----.",
+	"0" "-----"
+};
+
+
diff --git a/morse.c b/morse.c
@@ -0,0 +1,121 @@
+#include <X11/X.h>
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+
+#include <time.h>
+#include <unistd.h>
+#include <time.h>
+#include <err.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "lut.c"
+
+#define ARRLEN(x) (sizeof(x) / sizeof((x)[0]))
+
+static char translate(const char *seq);
+
+static const int long_ms = 300;
+static const int letter_ms = 1000;
+
+static char seqbuf[64];
+static int seqlen;
+
+char
+translate(const char *seq)
+{
+	int i;
+
+	for (i = 0; i < ARRLEN(morse_lut); i++) {
+		if (!strcmp(seq, morse_lut[i] + 1))
+			return morse_lut[i][0];
+	}
+
+	return '?';
+}
+
+int
+main(int argc, const char **argv)
+{
+	struct timespec press, release;
+	unsigned long diff_ms;
+	bool is_pressed;
+	int timeout_cnt;
+	Display *display;
+	XEvent event;
+	Window root;
+	int sleep_cnt;
+	int x11fd;
+	int ret;
+
+	setvbuf(stdout, NULL, _IONBF, 0);
+
+	display = XOpenDisplay(NULL);
+	if (!display) errx(1, "No display found");
+
+	root = DefaultRootWindow(display);
+	XGrabKey(display, XKeysymToKeycode(display, 'n'), 0, root,
+		False, GrabModeAsync, GrabModeAsync);
+
+	memset(&press, 0, sizeof(struct timespec));
+	memset(&release, 0, sizeof(struct timespec));
+
+	seqlen = 0;
+	seqbuf[seqlen] = '\0';
+
+	x11fd = XConnectionNumber(display);
+
+	timeout_cnt = 10;
+	is_pressed = false;
+	while (true) {
+		/* inaccurate and hacky but select()
+		 * with XGrabKey is not working */
+		sleep_cnt = 0;
+		while (!XPending(display) && sleep_cnt < letter_ms) {
+			usleep(1000);
+			sleep_cnt++;
+		}
+
+		if (!XPending(display)) {
+			if (!is_pressed) {
+				timeout_cnt++;
+				if (timeout_cnt == 1) {
+					putchar(translate(seqbuf));
+					seqlen = 0;
+					seqbuf[seqlen] = '\0';
+				}
+				if (timeout_cnt == 2)
+					putchar(' ');
+			}
+			continue;
+		} else {
+			timeout_cnt = 0;
+		}
+
+		XNextEvent(display, &event);
+		if (event.type == KeyPress && !is_pressed) {
+			is_pressed = true;
+			if (clock_gettime(CLOCK_REALTIME, &press))
+				err(1, "clock_gettime");
+		} else if (event.type == KeyRelease && is_pressed) {
+			is_pressed = false;
+			if (clock_gettime(CLOCK_REALTIME, &release))
+				err(1, "clock_gettime");
+			if (press.tv_sec == 0) continue;
+			diff_ms = (release.tv_sec - press.tv_sec) * 1000
+				+ (release.tv_nsec - press.tv_nsec) / 1000000;
+			if (seqlen >= sizeof(seqbuf) - 1)
+				continue;
+			if (diff_ms > long_ms) {
+				seqbuf[seqlen++] = '-';
+			} else {
+				seqbuf[seqlen++] = '.';
+			}
+			seqbuf[seqlen] = '\0';
+		}
+	}
+
+	XCloseDisplay(display);
+}