it kinda works...

main.c

@@ -4,7 +4,7 @@
 #include <signal.h>
 #include <string.h>
 
-#define DATFILE "/home/randomuser/datfile"
+#define DATFILE "/home/ryan/datfile"
 
 time_t buf;
 struct tm bt;
@@ -87,13 +87,19 @@ int timediff(struct tm f, struct tm l) {
 
 int main(int argc, char **argv) {
     if (argc != 2) { 
-        FILE *f = fopen(DATFILE, "a");
-        char *line;
-        struct session buffer;
+        FILE *f = fopen(DATFILE, "r");
+        char line[2048];
+        struct session session_array[20];
 
+        int counter = 0;
         while(fgets(line, sizeof(line), f)) {
-             buffer = line_to_session(&line);
-             write_session(f, buffer);
+             session_array[counter] = line_to_session(line);
+             counter++;
+        }
+        fclose(f);
+        FILE *fd = fopen(DATFILE, "a+");
+        for(int x = 0; x < counter; x++) {
+             write_session(fd, session_array[x]);
         }
         return 1;
     }