beginning drafting of tcp server

src/util.cpp

@@ -1,9 +1,33 @@
 #include <cstdio>
 #include <assert.h>
+#include <cstring>
 #include <stdlib.h>
 
 #include "util.hpp"
 
+template<class T> void append(array<T>& a, T el) {
+    if (a.len == a.cap) {
+        resize(a, a.cap*2);
+    }
+    a[a.len] = el;
+    a.len++;
+}
+
+
+template<class T> T pop(array<T>& a) {
+    assert(a.len >= 1);
+    a.len--;
+    return a.data[a.len+1];
+}
+
+template<class T> void resize(array<T> &a, size_t new_cap) {
+    T* new_data = (T*)malloc(new_cap);
+    memcpy(new_data, a.data, min(a.len, new_cap));
+    free(a.data);
+    a.len = min(a.len, new_cap);
+    a.cap = new_cap;
+}
+
 bool read_file(array<char>* out, const char* filepath) {
     FILE* fp = NULL;
     if (fopen_s(&fp, filepath, "rb") != 0) {
@@ -15,7 +39,7 @@ bool read_file(array<char>* out, const char* filepath) {
     size_t sz = ftell(fp);
     fseek(fp, 0, SEEK_SET);
 
-    char *data = (char*)malloc(sizeof(char)*sz);
+    char* data = (char*)malloc(sizeof(char) * sz);
     fread(data, sizeof(char), sz, fp);
     fclose(fp);
     out->data = data;