implement operator* for string

c_os/user/demo/StringDemo.cc

@@ -26,6 +26,10 @@ void StringDemo::run() {
     str3 += " World";
     kout << str3 << endl;
 
+    kout << "Hello World *= 3" << endl;
+    str3 *= 3;
+    kout << str3 << endl;
+
     kout << "String iterator!" << endl;
     for (const char c : str1) {
         kout << c << " ";

c_os/user/lib/String.h

@@ -4,6 +4,8 @@
 #include "user/lib/Array.h"
 #include "user/lib/Iterator.h"
 
+// A heap dynamically heap-allocated string (mutable)
+
 namespace bse {
 
     unsigned int strlen(const char* str);
@@ -132,6 +134,32 @@ namespace bse {
             return *this;
         }
 
+        string operator*(unsigned int n) const {
+            string new_str;
+            new_str.len = len * n;
+            new_str.buf = new char[new_str.len];
+
+            for (unsigned int i = 0; i < n; ++i) {
+                strncpy(&new_str.buf[i * len], len, buf);
+            }
+
+            return new_str;
+        }
+
+        string& operator*=(unsigned int n) {
+            unsigned int new_len = len * n;
+            char* new_buf = new char[new_len];
+
+            for (unsigned int i = 0; i < n; ++i) {
+                strncpy(&new_buf[i * len], len, buf);
+            }
+
+            delete[] buf;
+            buf = new_buf;
+            len = new_len;
+            return *this;
+        }
+
         bool operator==(const string& other) const {
             return strcmp(buf, other.buf) == 0;
         }