Version 1.2

- Now configure script also reads templates (files which end by .in)
  - So added template for config.mk
- Moved templates to templates/ folder

.gitignore

@@ -1,2 +1,6 @@
 obj/
-game
+build/
+csnake
+*.core
+include/config.h
+include/config.mk

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.5)
-project(csnake VERSION 0.1.0 LANGUAGES C)
+project(csnake VERSION 1.2 LANGUAGES C)
 
 if(PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
   message(FATAL_ERROR "In-source builds are not allowed.")
@@ -10,14 +10,29 @@ add_executable(csnake
   src/screen.c
   src/input.c
   src/player.c
+  src/sleep.c
+  src/platform/getch.c
+  src/platform/game.c
 )
 
 set_target_properties(csnake PROPERTIES C_STANDARD 11)
 set_target_properties(csnake PROPERTIES C_EXTENSIONS FALSE)
+
+if(${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
+    target_link_libraries(csnake pthread)
+elseif(${MINGW})
+    set(CMAKE_C_FLAGS "-D_UCRT")
+    target_link_libraries(csnake ucrt)
+endif()
+
 target_include_directories(csnake PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include)
 
-set(SIZE 10 CACHE STRING "Size of game field")
+set(FIELD_SIZE 10 CACHE STRING "Size of game field")
 set(DEFX 0 CACHE STRING "Start x")
 set(DEFY 0 CACHE STRING "Start y")
+set(SLEEP 1000 CACHE STRING "Sleep between frames (ms)")
 
-configure_file(include/config.h.in ${CMAKE_CURRENT_SOURCE_DIR}/include/config.h)
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/templates/config.h.in
+  ${CMAKE_CURRENT_SOURCE_DIR}/include/config.h
+)

LICENSE

@@ -0,0 +1,9 @@
+Copyright 2024 nakidai
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Makefile

@@ -1,24 +1,30 @@
-include config.mk
+include include/config.mk
 
 INCLUDE = -Iinclude
 RM  = rm -f
 SRCDIR = src
 OBJDIR = obj
-SRC = main.c screen.c input.c player.c
+SRC = main.c screen.c input.c player.c sleep.c platform/getch.c platform/game.c
 OBJ = $(addprefix $(OBJDIR)/,$(SRC:.c=.o))
 
-default: $(OUT)
+# Link pthread on FreeBSD
+DEFLDFLAGS += $(shell if echo "" | cc -E -dM -xc - | grep __FreeBSD__ > /dev/null 2>&1; then echo "-lpthread"; fi)
+# Use ucrt on MinGW
+DEFLDFLAGS += $(shell if echo "" | cc -E -dM -xc - | grep __MINGW32__ > /dev/null 2>&1; then echo "-lucrt"; fi)
+DEFCFLAGS  += $(shell if echo "" | cc -E -dM -xc - | grep __MINGW32__ > /dev/null 2>&1; then echo "-D_UCRT"; fi)
 
-obj:
-	mkdir obj
+all: $(OUT)
+
+$(OBJDIR)/platform:
+	mkdir -p $(OBJDIR)/platform
 
 $(OBJDIR)/%.o: $(SRCDIR)/%.c
-	$(CC) -c -o $@ $< $(CFLAGS) $(INCLUDE)
+	$(CC) -c -std=c11 -o $@ $< $(CFLAGS) $(DEFCFLAGS) $(INCLUDE)
 
-$(OUT): obj $(OBJ)
-	$(CC) -o $@ $(OBJ) $(LDFLAGS)
+$(OUT): $(OBJDIR)/platform $(OBJ)
+	$(CC) -o $@ $(OBJ) $(LDFLAGS) $(DEFLDFLAGS)
 
 clean:
-	$(RM) $(OUT) $(OBJDIR)/*
+	$(RM) $(OUT) $(OBJDIR)/*.o $(OBJDIR)/platform/*.o
 
 .PHONY: default clean

README.md

@@ -0,0 +1,19 @@
+# csnake
+Snakegame written in C.  
+
+Controls  
+--
+- WASD - movement  
+- P - Pause
+
+Supported platforms  
+--
+Was tested on:  
+- FreeBSD 13.2  
+- Windows 11 (both MSVC and MinGW)  
+- Linux 6.5.8 (glibc 2.38-7)  
+
+Building
+--
+- On \*nix-like systems you can use GNU Make with configure script providing arguments through environment variables or CMake   
+- On Windows you can use CMake  

config.mk

@@ -1,4 +0,0 @@
-CC = cc
-CFLAGS = 
-LDFLAGS = 
-OUT = game

configure

@@ -1,25 +1,37 @@
 #!/bin/sh
 
-if [[ "$*" == *"--help"* ]] || [[ "$*" == *"-h"* ]]
-then
+usage()
+{
     echo "Use environment variables to pass values:
-    CC      - compiler (default: cc)
-    CFLAGS  - flags for compiler
-    LDFLAGS - flags for linker
-    OUT     - out file (default: game
-    SIZE    - size of game field
-    DEFX    - start x
-    DEFY    - start y"
+    CC         - compiler (default: cc)
+    CFLAGS     - flags for compiler
+    LDFLAGS    - flags for linker
+    OUT        - out file (default: csnake
+    FIELD_SIZE - size of game field
+    DEFX       - start x
+    DEFY       - start y
+    SLEEP      - sleep between frames (ms)"
     exit 1
-fi
+}
+
+while test $# -gt 0; do
+    case "$1" in
+        -h) usage
+            ;;
+        --help) usage
+            ;;
+    esac
+    shift
+done
 
 CC=${CC:-cc}
 CFLAGS=${CFLAGS:-}
 LDFLAGS=${LDFLAGS:-}
-OUT=${OUT:-game}
-SIZE=${SIZE:-10}
+OUT=${OUT:-csnake}
+FIELD_SIZE=${FIELD_SIZE:-10}
 DEFX=${DEFX:-0}
 DEFY=${DEFY:-0}
+SLEEP=${SLEEP:-1000}
 
 echo "Makefile configuration:"
 echo "Compiler: $CC"
@@ -28,15 +40,10 @@ echo "LDFLAGS: $LDFLAGS"
 echo "Out file: $OUT"
 echo
 echo "Code configuration:"
-echo "Size: $SIZE"
+echo "Field size: $FIELD_SIZE"
 echo "Start x: $DEFX"
 echo "Start y: $DEFY"
+echo "Sleep: $SLEEP"
 
-echo "CC = $CC
-CFLAGS = $CFLAGS
-LDFLAGS = $LDFLAGS
-OUT = $OUT" > config.mk
-
-echo "#define SIZE $SIZE
-#define DEFX $DEFX
-#define DEFY $DEFY" > include/config.h
+eval "echo \"$(cat templates/config.mk.in)\"" > include/config.mk
+eval "echo \"$(cat templates/config.h.in)\""  > include/config.h

include/config.h

@@ -1,3 +0,0 @@
-#define SIZE 10
-#define DEFX 0
-#define DEFY 0

include/config.h.in

@@ -1,3 +0,0 @@
-#define SIZE ${SIZE}
-#define DEFX ${DEFX}
-#define DEFY ${DEFY}

include/input.h

@@ -3,12 +3,14 @@
 
 #include <stdbool.h>
 
+#include "platform/thread.h"
+
 typedef struct input_args_t
 {
-    char *out;
+    int  *out;
     bool *alive;
 } InputArgs;
 
-int input(void *vargp);
+ThreadR input(void *vargp);
 
 #endif /* __INPUT_H__ */

include/platform/game.h

@@ -0,0 +1,6 @@
+#ifndef __PLATFORM_GAME_H__
+#define __PLATFORM_GAME_H__
+
+void platformGameInit(void);
+
+#endif /* __PLATFORM_GAME_H__ */

include/platform/getch.h

@@ -0,0 +1,15 @@
+#ifndef __GETCH_H__
+#define __GETCH_H__
+
+#ifdef _WIN32
+#include <conio.h>
+#define getch _getch
+inline int getchInit(void) { return 0; }
+#else
+int getch(void);
+void getchInit(void);
+void getchResetTerminalStateHandler(int sig);
+void getchResetTerminalState(void);
+#endif /* _WIN32 */
+
+#endif /* __GETCH_H__ */

include/platform/screen.h

@@ -0,0 +1,29 @@
+#ifndef __PLATFORM_SCREEN_H__
+#define __PLATFORM_SCREEN_H__
+
+#ifdef _WIN32
+
+#ifdef __MINGW32__
+#include <windows.h>
+#else
+#include <Windows.h>
+#endif /* __MINGW32__ */
+
+#else
+#include <stdio.h>
+#endif /* _WIN32 */
+
+#ifdef _WIN32
+static inline void resetCoordinates(void)
+{
+    HANDLE output = GetStdHandle(STD_OUTPUT_HANDLE);
+    SetConsoleCursorPosition(output, (COORD){0});
+}
+#else
+static inline void resetCoordinates(void)
+{
+    printf("\e[1;1H\e[2J");
+}
+#endif /* _WIN32 */
+
+#endif /* __PLATFORM_SCREEN_H__ */

include/platform/thread.h

@@ -0,0 +1,29 @@
+#ifndef __THREAD_H__
+#define __THREAD_H__
+
+#ifdef _WIN32
+#include <process.h>
+#else
+#include <pthread.h>
+#include <stddef.h>
+#endif /* _WIN32 */
+
+#ifdef _WIN32
+typedef void  ThreadR;
+#define ThreadReturn return
+#else
+typedef void* ThreadR;
+#define ThreadReturn return NULL
+#endif /* _WIN32 */
+typedef ThreadR (*Thread)(void *);
+
+static inline void threadCreate(Thread function, void *args)
+{
+#ifdef _WIN32
+    _beginthread(function, 0, args);
+#else
+    pthread_create(&(pthread_t){0}, 0, function, args);
+#endif /* _WIN32 */
+}
+
+#endif /* __THREAD_H__ */

include/player.h

@@ -4,12 +4,7 @@
 #include <stdbool.h>
 #include "food.h"
 
-#define UP    0
-#define RIGHT 1
-#define DOWN  2
-#define LEFT  3
-
-typedef int Direction;
+typedef enum { UP, RIGHT, DOWN, LEFT} Direction;
 typedef struct player_node_t PlayerNode;
 typedef struct player_t Player;
 
@@ -26,11 +21,10 @@ struct player_t
     int score;
 };
 
-Player *playerCreate(Direction direction, int x, int y, int score);
-void playerFree(Player *player);
+void playerCreate(Player *buffer, Direction direction, int x, int y, int score);
 
-bool playerCheckSelfCollision(Player *player);
-bool playerCheckFoodCollision(Player *player, Food food);
+bool playerCheckSelfCollision(Player player);
+bool playerCheckFoodCollision(Player player, Food food);
 bool playerDoTick(Player *player, Food food);
 
 #endif /* __PLAYER_H__ */

include/screen.h

@@ -1,6 +1,8 @@
 #ifndef __SCREEN_H__
 #define __SCREEN_H__
 
+#include <string.h>
+
 typedef char Point;
 typedef struct screen_t
 {
@@ -9,11 +11,18 @@ typedef struct screen_t
     Point *screen;
 } Screen;
 
-Screen *screenCreate(int width, int height, Point fill_value);
-void screenFree(Screen *screen);
+void screenCreate(Screen *buffer, int width, int height, Point fill_value);
+void screenShow(Screen screen);
+
+static inline Point *screenGetPoint(Screen screen, int x, int y)
+{
+    return screen.screen + x + (y * screen.width);
+}
+
+static inline void screenSet(Screen screen, Point fill_value)
+{
+    memset(screen.screen, fill_value, screen.width * screen.height * sizeof(char));
+}
 
-Point *screenGetPoint(Screen *screen, int x, int y);
-void screenShow(Screen *screen);
-void screenSet(Screen *screen, char fill_value);
 
 #endif /* __SCREEN_H__ */

include/sleep.h

@@ -0,0 +1,6 @@
+#ifndef __SLEEP_H__
+#define __SLEEP_H__
+
+void sleepMS(int msec);
+
+#endif /* __SLEEP_H__ */

src/input.c

@@ -1,35 +1,18 @@
-#include "input.h"
 #include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
-#include <termios.h>
 
-char getch(void)
-{
-    char buf = 0;
-    struct termios old = { 0 };
-    fflush(stdout);
-    if (tcgetattr(0, &old) < 0) perror("tcsetattr()");
-    old.c_lflag    &= ~ICANON;   // local modes = Non Canonical mode
-    old.c_lflag    &= ~ECHO;     // local modes = Disable echo. 
-    old.c_cc[VMIN]  = 1;         // control chars (MIN value) = 1
-    old.c_cc[VTIME] = 0;         // control chars (TIME value) = 0 (No time)
-    if (tcsetattr(0, TCSANOW, &old) < 0) perror("tcsetattr ICANON");
-    if (read(0, &buf, 1) < 0) perror("read()");
-    old.c_lflag    |= ICANON;    // local modes = Canonical mode
-    old.c_lflag    |= ECHO;      // local modes = Enable echo. 
-    if (tcsetattr(0, TCSADRAIN, &old) < 0) perror ("tcsetattr ~ICANON");
-    return buf;
-}
+#include "input.h"
+#include "platform/thread.h"
+#include "platform/getch.h"
 
-int input(void *vargp)
+ThreadR input(void *vargp)
 {
-    char *out = ((InputArgs *)vargp)->out;
+    int *out = ((InputArgs *)vargp)->out;
     bool *alive = ((InputArgs *)vargp)->alive;
 
     while (*alive)
     {
         *out = getch();
     }
-    return 0;
+    ThreadReturn;
 }

src/main.c

@@ -1,7 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
-#include <threads.h>
 #include <time.h>
 
 #include "input.h"
@@ -9,89 +8,87 @@
 #include "player.h"
 #include "food.h"
 #include "config.h"
+#include "sleep.h"
+#include "platform/thread.h"
+#include "platform/screen.h"
+#include "platform/game.h"
 
-void drawPlayer(Player *player, Screen *screen)
+void drawPlayer(Player player, Screen screen)
 {
     PlayerNode *node;
-    for (node = player->tail; node != NULL; node = node->next)
+    for (node = player.tail; node != NULL; node = node->next)
         *screenGetPoint(screen, node->x, node->y) = '#';
 }
 
-Food generateFood(Player *player)
+Food generateFood(Player player)
 {
     Food food;
     do
     {
-        food = (Food){rand() % SIZE, rand() % SIZE};
+        food = (Food){rand() % FIELD_SIZE, rand() % FIELD_SIZE};
     } while (playerCheckFoodCollision(player, food));
     return food;
 }
 
-void resetCoordinates(void)
-{
-    printf("\e[1;1H\e[2J");
-}
-
 int main(int argc, char **argv)
 {
-    srand(time(NULL));
-    Player *player = playerCreate(DOWN, DEFX, DEFY, 0);
-    Screen *screen = screenCreate(SIZE, SIZE, ' ');
-    PlayerNode *node;
-    thrd_t input_thread;
-    int i;
-    int head_x, head_y;
-    Food food = generateFood(player);
+    srand((unsigned int)time(NULL));
+    platformGameInit();
 
-    bool *running = malloc(sizeof(bool)); *running = true;
-    char *key = malloc(sizeof(char)); *key = 0;
-    InputArgs input_args = (InputArgs){ key, running };
+    Player player; playerCreate(&player, DOWN, DEFX, DEFY, 0);
+    Screen screen; screenCreate(&screen, FIELD_SIZE, FIELD_SIZE, ' ');
+    Food   food =  generateFood(player);
 
-    thrd_create(&input_thread, input, &input_args);
-    while (*running)
+    int  key = 0;
+    bool running = true;
+    bool stopped = false;
+    int  head_x, head_y;
+
+    threadCreate(input, &(InputArgs){ &key, &running });
+    while (running)
     {
-        switch (*key)
-        {
-            case 'q':
-                *running = false; return 0;
-            case 'w':
-                if (player->direction == DOWN) break;
-                player->direction = UP; break;
-            case 'd':
-                if (player->direction == LEFT) break;
-                player->direction = RIGHT; break;
-            case 's':
-                if (player->direction == UP) break;
-                player->direction = DOWN; break;
-            case 'a':
-                if (player->direction == RIGHT) break;
-                player->direction = LEFT; break;
-        }
-
-        if (playerDoTick(player, food))
-            food = generateFood(player);
-        if (playerCheckSelfCollision(player))
-        {
-            *running = false;
-            break;
-        }
-        head_x = player->head->x;
-        head_y = player->head->y;
-        if (head_x >= SIZE || head_x < 0 || head_y >= SIZE || head_y < 0)
-        {
-            *running = false;
-            break;
-        }
-
         screenSet(screen, ' ');
         drawPlayer(player, screen);
         *screenGetPoint(screen, food.x, food.y) = '@';
+
         resetCoordinates();
         screenShow(screen);
-        for (i = 0; i < SIZE*2; ++i) putchar('-');
-        printf("\nScore: %d\n", player->score);
+        for (int i = 0; i < FIELD_SIZE*2; ++i) putchar('-');
+        printf("\nScore: %d\n", player.score);
 
-        thrd_sleep(&(struct timespec){.tv_sec=1}, NULL);
+        sleepMS(SLEEP);
+
+        switch (key)
+        {
+            case 'q':
+                running = false; return 0;
+            case 'p':
+                stopped = !stopped; break;
+            case 'w':
+                if (player.direction == DOWN) break;
+                player.direction = UP; break;
+            case 'd':
+                if (player.direction == LEFT) break;
+                player.direction = RIGHT; break;
+            case 's':
+                if (player.direction == UP) break;
+                player.direction = DOWN; break;
+            case 'a':
+                if (player.direction == RIGHT) break;
+                player.direction = LEFT; break;
+        } key = 0;
+        if (stopped) continue;
+
+        if (playerDoTick(&player, food) && player.score < FIELD_SIZE*FIELD_SIZE - 1)
+            food = generateFood(player);
+
+        head_x = player.head->x;
+        head_y = player.head->y;
+        if (head_x >= FIELD_SIZE || head_x < 0 || head_y >= FIELD_SIZE || head_y < 0 || playerCheckSelfCollision(player))
+        {
+            running = false;
+            break;
+        }
     }
     return 0;
 }

src/platform/game.c

@@ -0,0 +1,24 @@
+#ifdef _WIN32
+void platformGameInit(void) {}
+#else
+
+#include <signal.h>
+#include <stdlib.h>
+
+#include "platform/getch.h"
+
+void platformGameInit(void)
+{
+    getchInit();
+    
+    atexit(getchResetTerminalState);
+
+    signal(SIGINT,  getchResetTerminalStateHandler);
+    signal(SIGABRT, getchResetTerminalStateHandler);
+    signal(SIGFPE,  getchResetTerminalStateHandler);
+    signal(SIGILL,  getchResetTerminalStateHandler);
+    signal(SIGSEGV, getchResetTerminalStateHandler);
+    signal(SIGTERM, getchResetTerminalStateHandler);
+}
+
+#endif /* _WIN32 */

src/platform/getch.c

@@ -0,0 +1,43 @@
+#ifndef _WIN32
+#include <unistd.h>
+#include <termios.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static struct termios DefaultState = {0};
+
+int getch(void)
+{
+    char buf = 0;
+    struct termios old = {0};
+    fflush(stdout);
+    if (tcgetattr(0, &old) < 0) perror("tcsetattr()");
+    old.c_lflag    &= ~ICANON;   // local modes = Non Canonical mode
+    old.c_lflag    &= ~ECHO;     // local modes = Disable echo. 
+    old.c_cc[VMIN]  = 1;         // control chars (MIN value) = 1
+    old.c_cc[VTIME] = 0;         // control chars (TIME value) = 0 (No time)
+    if (tcsetattr(0, TCSANOW, &old) < 0) perror("tcsetattr ICANON");
+    if (read(0, &buf, 1) < 0) perror("read()");
+    old.c_lflag    |= ICANON;    // local modes = Canonical mode
+    old.c_lflag    |= ECHO;      // local modes = Enable echo. 
+    if (tcsetattr(0, TCSADRAIN, &old) < 0) perror ("tcsetattr ~ICANON");
+    return (int)buf;
+}
+
+void getchResetTerminalState(void)
+{
+    tcsetattr(0, TCSANOW, &DefaultState);
+}
+
+void getchResetTerminalStateHandler(int sig)
+{
+    getchResetTerminalState();
+    _Exit(sig);
+}
+
+void getchInit(void)
+{
+    tcgetattr(0, &DefaultState);
+}
+
+#endif /* !_WIN32 */

src/player.c

@@ -2,39 +2,32 @@
 
 #include "player.h"
 
-Player *playerCreate(Direction direction, int x, int y, int score)
+void playerCreate(Player *buffer, Direction direction, int x, int y, int score)
 {
-    Player *player = (Player *)malloc(sizeof(Player));
     PlayerNode *head = (PlayerNode *)malloc(sizeof(PlayerNode));
 
     head->x = x;
     head->y = y;
     head->next = NULL;
 
-    player->tail = head;
-    player->head = head;
-    player->score = score;
-    player->direction = direction;
-
-    return player;
+    buffer->tail = head;
+    buffer->head = head;
+    buffer->score = score;
+    buffer->direction = direction;
 }
 
-void playerFree(Player *player)
+bool playerCheckFoodCollision(Player player, Food food)
 {
-}
-
-bool playerCheckFoodCollision(Player *player, Food food)
-{
-    for (PlayerNode *node = player->tail; node != NULL; node = node->next)
+    for (PlayerNode *node = player.tail; node != NULL; node = node->next)
         if (node->x == food.x && node->y == food.y)
             return true;
     return false;
 }
 
-bool playerCheckSelfCollision(Player *player)
+bool playerCheckSelfCollision(Player player)
 {
     PlayerNode *nodei, *nodej;
-    for (nodei = player->tail; nodei != NULL; nodei = nodei->next)
+    for (nodei = player.tail; nodei != NULL; nodei = nodei->next)
         for (nodej = nodei->next; nodej != NULL; nodej = nodej->next)
             if (nodei->x == nodej->x && nodei->y == nodej->y)
                 return true;
@@ -45,6 +38,7 @@ bool playerDoTick(Player *player, Food food)
 {
     bool food_collision;
     PlayerNode *new_head = (PlayerNode *)malloc(sizeof(PlayerNode));
+    new_head->next = NULL;
     int head_x = player->head->x;
     int head_y = player->head->y;
     

src/screen.c

@@ -1,36 +1,24 @@
-#include "screen.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-Screen *screenCreate(int width, int height, Point fill_value)
+#include "screen.h"
+
+void screenCreate(Screen *buffer, int width, int height, Point fill_value)
 {
     Point *screen = malloc(width * height * sizeof(Point));
     memset(screen, fill_value, width * height * sizeof(Point));
 
-    Screen *out = malloc(sizeof(Screen));
-    out->width = width;
-    out->height = height;
-    out->screen = screen;
-    return out;
+    buffer->width = width;
+    buffer->height = height;
+    buffer->screen = screen;
 }
 
-void screenFree(Screen *screen)
-{
-    free(screen->screen);
-    free(screen);
-}
-
-Point *screenGetPoint(Screen *screen, int x, int y)
-{
-    return screen->screen + x + (y * screen->width);
-}
-
-void screenShow(Screen *screen)
+void screenShow(Screen screen)
 {
     int x, y, i;
-    int width = screen->width;
-    int height = screen->height;
+    int width = screen.width;
+    int height = screen.height;
     Point point;
 
     for (y = 0; y < height; ++y)
@@ -43,8 +31,3 @@ void screenShow(Screen *screen)
         putchar('\n');
     }
 }
-
-void screenSet(Screen *screen, Point fill_value)
-{
-    memset(screen->screen, fill_value, screen->width * screen->height * sizeof(char));
-}

src/sleep.c

@@ -0,0 +1,14 @@
+#include <time.h>
+
+static long long int getMS()
+{
+    struct timespec ts;
+    timespec_get(&ts, TIME_UTC);
+    return ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
+}
+
+void sleepMS(int msec)
+{
+    long long int end = getMS() + msec;
+    while (getMS() < end);
+}

templates/config.h.in

@@ -0,0 +1,4 @@
+#define FIELD_SIZE ${FIELD_SIZE}
+#define DEFX ${DEFX}
+#define DEFY ${DEFY}
+#define SLEEP ${SLEEP}

templates/config.mk.in

@@ -0,0 +1,4 @@
+CC = ${CC}
+CFLAGS = ${CFLAGS}
+LDFLAGS = ${LDFLAGS}
+OUT = ${OUT}