alsa-visual/spark_ncurses.c

#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <ncurses.h>
#include <sys/ioctl.h>
#include <ctype.h>

#define ARG_SIZE 50

struct winsize ws;

int max;
int min;

int args;
size_t middle;
int add_value(const char *str) {
	if (args > (int)ws.ws_col)
		return 1;

	int val1 = atoi(str);

	int val2 = val1;
	if (val2 < 0)
		val2 *= -1;

	if (val2 > max)
		max = val2;

	else if (val2 < min)
		min = val2;

	int k = (val2 - min) * (middle - 5) / ((max - min) + 1);
	if (val1 > 0)
		mvprintw(middle - k, args, "@");

	else
		mvprintw(middle + k, args, "@");

	args++;
	return 0;
}

void stdin_read(void) {
	char arg[ARG_SIZE + 1];
	char *p = arg;

	while (1) {
		int c = getchar();
		if (c == EOF)
			return;

		else if (c == ' ' && p != arg) {
			*p = '\0';
			p = arg;

			if (add_value(arg))
				break;
		}

		else {
			*p = c;
			if (p + 1 == arg + sizeof(arg))
				break;

			p++;
		}
	}
}

void sig_handler(int sig) {
	(void)sig;

	endwin();
	exit(0);
}

int main(void) {
	signal(SIGINT, sig_handler);
	signal(SIGTERM, sig_handler);
	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0)
		return 1;

	initscr();
	noecho();
	curs_set(0);
	timeout(0);

	middle = ws.ws_row / 2;
	while (1) {
		args = 0;

		clear();
		stdin_read();
		refresh();
	}
}