1 files changed, 77 insertions, 0 deletions
diff --git a/src/cache.c b/src/cache.c
new file mode 100644
index 0000000..60a0fa6
--- /dev/null
+++ b/src/cache.c
@@ -0,0 +1,77 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "include/cache.h"
+#include "include/read_cfg.h"
+
+void save_to_cache(int g_hover, int e_hover, int true_hover, char *cfg_name){
+	FILE *fp;
+	struct stat cfg_stat; //for determining last modification time of file
+	char *path = get_cache_path(true);
+
+	//ensure get_cache_path() did not return NULL
+	if(path == NULL) return;
+
+	//open cache file for writing
+	fp = fopen(path, "wb");
+	if(fp == NULL){
+		printf("Failed to save cache data: could not open \"%s\"\n", path);
+		return;
+	}
+
+	//determine last modification time for cfg file
+	stat(cfg_name, &cfg_stat);
+
+	//write to file
+	fwrite(cfg_name, sizeof(char), BUF_LEN, fp);
+	fwrite(&cfg_stat.st_mtime, sizeof(long int), 1, fp);
+	fwrite(&g_hover, sizeof(int), 1, fp);
+	fwrite(&e_hover, sizeof(int), 1, fp);
+	fwrite(&true_hover, sizeof(int), 1, fp);
+
+	fclose(fp);
+	return;
+}
+
+void load_cache(int *g_hover, int *e_hover, int *true_hover, char *new_cfg_name){
+	FILE *fp;
+	char *path = get_cache_path(false);
+	char saved_cfg_name[BUF_LEN];
+	long int saved_cfg_mtime;
+	struct stat new_cfg_stat;
+
+	//ensure get_cache_path() did not return NULL
+	if(path == NULL) return;
+
+	//open cache file for reading
+	fp = fopen(path, "rb");
+	if(fp == NULL){
+		printf("Failed to load cached data: could not open \"%s\"\n", path);
+		return;
+	}
+
+	//check that cfg_name matches and is not newer than the cached cfg; if not, do not load from cache
+	fread(saved_cfg_name, sizeof(char), BUF_LEN, fp);
+	fread(&saved_cfg_mtime, sizeof(long int), 1, fp);
+	stat(new_cfg_name, &new_cfg_stat);
+
+	if(!(strcmp(saved_cfg_name, new_cfg_name)) && saved_cfg_mtime >= new_cfg_stat.st_mtime){
+		fread(g_hover, sizeof(int), 1, fp);
+		fread(e_hover, sizeof(int), 1, fp);
+		fread(true_hover, sizeof(int), 1, fp);
+	}
+
+	else{
+		*g_hover = 0;
+		*e_hover = 0;
+		*true_hover = 0;
+	}
+
+	fclose(fp);
+	return;
+}