feat: day 2

input_handler.c

@@ -0,0 +1,30 @@
+//
+// Created by Lennart on 02/12/2023.
+//
+
+#include "input_handler.h"
+#include <stdlib.h>
+#include <string.h>
+
+#define INITIAL_CAPACITY 64
+
+const char* read_line(FILE *f, char **buffer, int *capacity) {
+    if(*buffer == NULL) {
+        *buffer = malloc(2 * sizeof (char) * INITIAL_CAPACITY);
+        *capacity = INITIAL_CAPACITY;
+    }
+
+    int position = 0;
+    while(!feof(f)) {
+        char *res = fgets(*buffer + position, *capacity - position, f);
+        if(res[strlen(res) - 1] == '\n') {
+            return *buffer;
+        }
+
+        *buffer = realloc(*buffer, 2 * sizeof (char) * *capacity);
+        position += (int) strlen(res);
+        *capacity *= 2;
+    }
+
+    return *buffer;
+}