kernel/TextConsole: Add a write() function that accepts a fixed-size buffer instead of relying on null terminators

kernel/src/video/TextConsole.cpp

@@ -172,6 +172,12 @@ namespace TextConsole
         return {};
     }
 
+    Result<void> write(const char* str, usize len)
+    {
+        while (len--) TRY(putchar(*str++));
+        return {};
+    }
+
     void wprint(const wchar_t* str)
     {
         while (*str) putwchar(*str++);

kernel/src/video/TextConsole.h

@@ -14,6 +14,7 @@ namespace TextConsole
     u32 background();
     void move_to(u32 x, u32 y);
     Result<void> print(const char* str);
+    Result<void> write(const char* str, usize len);
     void wprint(const wchar_t* str);
     Result<void> println(const char* str);
     void wprintln(const wchar_t* str);