Added highscore functionality

README.md

@@ -23,7 +23,7 @@ create a .c file which implements all the functions in gfx.h and add a Makefile
     -c             Enables color support (ncurses version only)
     -C             Disables color support (ncurses version only)
 
-Fonts used in SDL version can be found [here](openfontlibrary.org).
+Fonts used in SDL version can be found [here](www.openfontlibrary.org).
 
 ## License
 This code is licensed under the [MIT License](https://github.com/Tiehuis/2048-cli/blob/master/LICENSE).

src/engine.c

@@ -1,6 +1,7 @@
 #include <stdlib.h>
 #include <time.h>
 #include "engine.h"
+#include "highscore.h"
 
 /* Utilize block counter to improve some of the functions so they can run
  * quicker */
@@ -249,6 +250,8 @@ struct gamestate* gamestate_init(struct gameoptions *opt)
     g->blocks_in_play = 0;
     g->opts = opt;
 
+    highscore_load(g);
+
     /* Initial 3 random blocks */
     gamestate_new_block(g);
     gamestate_new_block(g);
@@ -279,6 +282,7 @@ int gamestate_tick(struct gfx_state *s, struct gamestate *g, int d, void (*callb
 /* Free all data associated with the gamestate */
 void gamestate_clear(struct gamestate *g)
 {
+    highscore_save(g);
     gameoptions_destroy(g->opts);
     free(g->grid_data_ptr);   /* Free grid data */
     free(g->grid);      /* Free pointers to data slots */

src/highscore.c

@@ -0,0 +1,75 @@
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include "engine.h"
+
+const char *hs_dir_name  = "2048";
+const char *hs_file_name = "highscore";
+
+static const char* highscore_retrieve_file(void)
+{
+    static char buffer[4096];
+
+    if (getenv("XDG_DATA_HOME") != NULL) {
+        snprintf(buffer, sizeof(buffer), "%s/%s/%s",
+                getenv("XDG_DATA_HOME"), hs_dir_name, hs_file_name);
+    }
+    else if (getenv("HOME")) {
+        snprintf(buffer, sizeof(buffer), "%s/.local/share/%s/%s",
+                getenv("HOME"), hs_dir_name, hs_file_name);
+    }
+    else {
+        return hs_file_name;
+    }
+
+    /* Create file only if it doesn't exist */
+    if (access(buffer, F_OK) != -1)
+        return buffer;
+
+    char *sep = strrchr(buffer, '/');
+    while (sep != NULL) {
+        *sep = '\0';
+        if (strlen(buffer) != 0)
+            mkdir(buffer, 0777);
+        char *tmpsep = sep;
+        sep = strrchr(buffer, '/');
+        *tmpsep = '/';
+    }
+
+    return buffer;
+}
+
+void highscore_reset(void)
+{
+    const char *hsfile = highscore_retrieve_file();
+
+    FILE *fd = fopen(hsfile, "w+");
+    fprintf(fd, "%d", 0);
+    fclose(fd);
+}
+
+void highscore_load(struct gamestate *g)
+{
+    const char *hsfile = highscore_retrieve_file();
+
+    FILE *fd = fopen(hsfile, "r");
+    if (fd == NULL)
+        fd = fopen(hsfile, "w+");
+
+    fscanf(fd, "%ld", &g->score_high);
+    fclose(fd);
+}
+
+void highscore_save(struct gamestate *g)
+{
+    if (g->score < g->score_high || g->opts->grid_width != 4 || g->opts->grid_height != 4)
+        return;
+
+    const char *hsfile = highscore_retrieve_file();
+
+    FILE *fd = fopen(hsfile, "w");
+    fprintf(fd, "%ld", g->score);
+    fclose(fd);
+}

src/highscore.h

@@ -0,0 +1,8 @@
+#ifndef HIGHSCORE_H
+#define HIGHSCORE_H
+
+void highscore_reset(void);
+void highscore_load(struct gamestate *g);
+void highscore_save(struct gamestate *g);
+
+#endif

src/options.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include "highscore.h"
 #include "options.h"
 
 void print_usage(void)
@@ -77,6 +78,7 @@ struct gameoptions* parse_options(struct gameoptions *opt, int argc, char **argv
             opt->spawn_rate = strtol(optarg, NULL, 10);
             break;
         case 'r':
+            highscore_reset();
             exit(0);
         case 'h':
             print_usage();