[kernel] Deal with getting multiple log entries in debugcon

Getting entries from the logger object can return multiple in the same
buffer - debugcon was not accounting for the subsequent entries.

src/kernel/debugcon.cpp

@@ -21,8 +21,8 @@ namespace {
     }
 
     inline void debug_endline() {
-        static const char *newline = "\e[38;5;0m\r\n";
-        asm ( "rep outsb;" :: "c"(11), "d"(port), "S"(newline) );
+        static const char *newline = "\e[0m\r\n";
+        asm ( "rep outsb;" :: "c"(6), "d"(port), "S"(newline) );
     }
 } // anon namespace
 
@@ -64,7 +64,6 @@ logger_task()
     uint64_t seen = 0;
     size_t buf_size = 128;
     uint8_t *buf = new uint8_t [buf_size];
-    entry *header = reinterpret_cast<entry*>(buf);
 
     while (true) {
         size_t size = g_logger.get_entry(seen, buf, buf_size);
@@ -72,12 +71,16 @@ logger_task()
             delete [] buf;
             buf_size *= 2;
             buf = new uint8_t [buf_size];
-            header = reinterpret_cast<entry*>(buf);
             continue;
         }
 
+        entry *header = reinterpret_cast<entry*>(buf);
+        while (size > sizeof(entry)) {
             output(header);
             seen = header->id;
+            size -= header->bytes;
+            header = util::offset_pointer(header, header->bytes);
+        }
     }
 }