commit 01b214f53b9b62637fb2adaf00667867f9473d01
Author: Daniel <daniel@web-box>
Date:   Wed Mar 1 16:43:37 2017 +0100

    initial

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..84a500a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,17 @@
+CC=gcc
+CFLAG= -O -g -o
+objects=main.o\
+	playfield.o\
+	input_output.o
+
+all:main
+
+%.o:%.c
+	$(CC) -c $(CFLAG) $@ $<
+
+
+main: clean $(objects)
+	$(CC) $(objects) $(CFLAG) main
+
+clean:
+	rm $(objects) || true
diff --git a/conf.h b/conf.h
new file mode 100644
index 0000000..9ad470c
--- /dev/null
+++ b/conf.h
@@ -0,0 +1,21 @@
+
+#ifndef __conf__h_
+#define __conf__h_
+
+#define WIDTH 50
+#define LINES 20
+
+
+#define KEY_DEFAULT '_'
+#define KEY_RIGHT 'd'
+#define KEY_LEFT 'a'
+#define KEY_EXIT 'q'
+#define CHAR_ME '#'
+#define CHAR_ENEMY '*'
+#define ESCAPE_RED "\033[31m"
+#define ESCAPE_GREEN "\033[32m"
+#define ESCAPE_RESET "\033[0m"
+
+#define CHRS_TO_CLEAR_ESCAPE 7
+
+#endif
diff --git a/input_output.c b/input_output.c
new file mode 100644
index 0000000..0c85233
--- /dev/null
+++ b/input_output.c
@@ -0,0 +1,71 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<unistd.h>
+#include<sys/select.h>
+#include<signal.h>
+static volatile char EOF_received = 0;
+
+#include "conf.h"
+void put_line(char * line)
+{
+	int i;
+	putc('|', stdout);
+	for(i = 0; i < WIDTH; i++)
+	{
+		// FIXME: add colors
+		if(line[i] == CHAR_ME)
+		{
+			printf(ESCAPE_GREEN);
+		}
+		if(line[i] == CHAR_ENEMY)
+		{
+			printf(ESCAPE_RED);
+		}
+		putc(line[i], stdout);
+		if(line[i] == CHAR_ME || line[i] == CHAR_ENEMY)
+		{
+			printf(ESCAPE_RESET);
+		}
+	}
+	putc('|', stdout);
+	putc('\n', stdout);
+}
+
+void clear_screen(void)
+{
+	int i, j;
+	// clear the screen
+	for(i = 0; i < LINES + 3; i++)
+	{
+		for(j = 0; j < WIDTH  + 3 + CHRS_TO_CLEAR_ESCAPE; j++)
+		{
+			putc('\b', stdout);
+		}
+		printf("\r\033[A");
+	}
+
+}
+
+char kb_hit(void)
+{
+	struct timeval tv = { 0L, 0L };
+	fd_set fds;
+	FD_ZERO(&fds);
+	FD_SET(0, &fds);
+	return select(1, &fds, NULL, NULL, &tv);
+}
+
+
+char get_last_key_or_default(void)
+{
+	int key = KEY_DEFAULT;
+	while(kb_hit())
+	{
+		key = getc(stdin);
+	}
+	if(key == EOF)
+	{
+		EOF_received = 1;
+	}
+	return key;
+}
diff --git a/input_output.h b/input_output.h
new file mode 100644
index 0000000..f24bcba
--- /dev/null
+++ b/input_output.h
@@ -0,0 +1,16 @@
+#ifndef __input_output_h_
+#define __input_output_h_
+#include<stdio.h>
+#include<stdlib.h>
+#include<unistd.h>
+#include<sys/select.h>
+#include<signal.h>
+
+#include "conf.h"
+void put_line(char * line);
+void clear_screen(void);
+char kb_hit(void);
+char get_last_key_or_default(void);
+static volatile char EOF_received = 0;
+
+#endif
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..ddf610b
--- /dev/null
+++ b/main.c
@@ -0,0 +1,148 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<unistd.h>
+#include<termios.h>
+#include <sys/select.h>
+#include<signal.h>
+
+#include"input_output.h"
+#include"playfield.h"
+
+
+int difficulty = 200;
+static struct termios oldt, newt;
+char  * playfield;
+char ** horizon;
+
+static volatile char sigint_received = 0;
+
+int main(void)
+{
+
+	// set up the terminal for our hacky game....
+
+	static struct termios oldt, newt;
+	tcgetattr(STDIN_FILENO, &oldt);
+	newt = oldt;
+	newt.c_lflag &= ~(ICANON | ECHO);
+	tcsetattr(STDIN_FILENO, TCSANOW, &newt);
+
+	// ok done
+
+	int pos = 0;
+
+
+	unsigned long long int score = 0;
+
+	char input = KEY_DEFAULT;
+	int to_place = 0;
+	printf("q: end; d: right; a: left\n\n\n");
+
+	while(input != KEY_EXIT && !(EOF_received || sigint_received))
+	{
+		horizon_drop_one_line(horizon);
+		// clear both the cursor and
+		// the last enemy
+		playfield[pos] = ' ';
+		horizon[0][to_place] = ' ';
+
+		if(input == KEY_RIGHT)
+		{
+			pos++;
+			if(pos >= WIDTH)
+			{
+				pos = 0;
+			}
+		}
+		if(input == KEY_LEFT)
+		{
+			pos--;
+			if(pos < 0)
+			{
+				pos = WIDTH - 1;
+			}
+		}
+		if(input == KEY_EXIT)
+		{
+			break;
+		}
+		clear_screen();
+		
+		print_horizon(horizon);
+
+		playfield[pos] = CHAR_ME; 
+		to_place = (random() & 0xff) % WIDTH;
+		horizon[0][to_place] = CHAR_ENEMY;
+		put_line(playfield);
+
+		if(horizon[LINES - 1][pos] == CHAR_ENEMY)
+		{
+			printf("GAME OVER!\nYour score was: %llu\n", score);
+			break;
+		}
+		usleep(difficulty * 1000);
+		score++;
+
+		if(!(score % 50))
+		{
+			difficulty--;
+		}
+		if(score == 0)
+		{
+			printf("Congrats. You won the game.\nAnd you have absolutely no life.\nat all.\n");
+			break;
+		}
+
+		printf("SCORE: %llu\n", score);
+
+		// check this to prevent blocking
+		if(EOF_received || sigint_received)
+		{
+			break;
+		}
+		input = get_last_key_or_default();
+	}
+
+	tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
+	return 0;
+}
+
+void __attribute__((cold)) handle_sigint(int signum)
+{
+	sigint_received = 1;
+}
+void __attribute__((cold)) handle_sigterm(int signum)
+{
+	printf("\n\nTERMINATED!\n");
+	exit(1);
+
+}
+
+/*
+Constructor: Add a sighandler for SIGINT and SIGTERM
+ */
+void __attribute__((constructor)) add_signal_handlers(void)
+{
+	signal(SIGINT, handle_sigint);
+	signal(SIGTERM, handle_sigterm);
+}
+
+/*
+Destructor: Free memory 
+ */
+void __attribute__((destructor)) clean(void)
+{
+	free(playfield);
+	delete_horizon(horizon);
+	printf("\n");
+}
+
+/*
+Constructor: create all the data we need
+ */
+void __attribute__((constructor)) build_playfield(void)
+{
+	playfield = allocate_playfield(WIDTH);
+	build_horizon(&horizon);
+}
+
diff --git a/playfield.c b/playfield.c
new file mode 100644
index 0000000..3769ca4
--- /dev/null
+++ b/playfield.c
@@ -0,0 +1,76 @@
+#include<stdlib.h>
+#include<stdio.h>
+#include"conf.h"
+#include"input_output.h"
+
+
+void build_horizon(char *** horizon)
+{
+	char ** h = calloc(sizeof(char * ), LINES);
+	int i, j;
+	for(i = 0; i < LINES; i++)
+	{
+		h[i] = calloc(sizeof(char), WIDTH);
+		for(j = 0; j < WIDTH; j++)
+		{
+			h[i][j] = ' ';
+		}
+		putc('\n', stdout); // make space for the game
+	}
+	*horizon = h;
+}
+
+void horizon_drop_one_line(char ** horizon)
+{
+	
+	int i, j;
+	for(i = LINES - 1; i >= 1; i--)
+	{
+		for(j = 0; j < WIDTH; j++)
+		{
+			horizon[i][j] = horizon[i - 1][j];
+		}
+	}
+}
+
+void print_horizon(char ** horizon)
+{
+	int i;
+	putc('+', stdout);
+	for(i = 0; i < WIDTH ; i++)
+	{
+		putc('-', stdout);
+	}
+	putc('+', stdout);
+	putc('\n', stdout);
+	
+	for(i = 0; i < LINES; i++)
+	{
+		put_line(horizon[i]);
+	}
+}
+
+void delete_horizon(char ** horizon)
+{
+	int i;
+	for(i = 0; i < LINES; i++)
+	{
+		free(horizon[i]);
+	}
+	free(horizon);
+}
+
+
+
+char * allocate_playfield(size_t width)
+{
+	char * field = calloc(sizeof(char), width);
+
+	size_t i;
+	for(i = 0; i < width; i++)
+	{
+		field[i] = ' ';
+	}
+	return field;
+}
+
diff --git a/playfield.h b/playfield.h
new file mode 100644
index 0000000..4957209
--- /dev/null
+++ b/playfield.h
@@ -0,0 +1,10 @@
+#ifndef __playfield_h_
+#define __playfield_h_
+
+void build_horizon(char *** horizon);
+void horizon_drop_one_line(char ** horizon);
+void print_horizon(char ** horizon);
+void delete_horizon(char ** horizon);
+char * allocate_playfield(size_t width);
+
+#endif