Initial commit of code for dopelib, and ch 1, 2, and 12

libs/chapter12/chapter12.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <iostream>
+
+void reverse_str(char* str);

libs/chapter12/meson.build

@@ -0,0 +1,4 @@
+chapter12_sources = ['reverse_string.cpp']
+
+chapter12_lib = static_library('chapter12',
+                               chapter12_sources)

libs/chapter12/reverse_string.cpp

@@ -0,0 +1,20 @@
+#include "chapter12.hpp"
+#include <string.h>
+#include <stdlib.h>
+
+/*
+  Reverse String: Implement a function void reverse( char* str) in C or C++ which reverses
+  a null-terminated string.
+*/
+
+void reverse_str(char *str){
+  size_t len = strlen(str);
+  char *tmp = reinterpret_cast<char*>(malloc(len));
+  strcpy(tmp, str);
+  for(unsigned int offset = 0; offset < len; ++offset){
+    str[offset] = tmp[len-offset-1];
+  }
+  str[len] = '\0';
+
+  free(tmp);
+}