lib/standard: Introduce Byte type in kernel

[nit.git] / lib / standard / string.nit

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index ff46e46..b02ff9b 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -2035,6 +2035,26 @@ redef class Bool
        end
 end
 
+redef class Byte
+       # C function to calculate the length of the `NativeString` to receive `self`
+       private fun byte_to_s_len: Int is extern "native_byte_length_str"
+
+       # C function to convert an nit Int to a NativeString (char*)
+       private fun native_byte_to_s(nstr: NativeString, strlen: Int) is extern "native_byte_to_s"
+
+       # Displayable byte in its hexadecimal form (0x..)
+       #
+       #     assert 1.to_b.to_s       == "0x01"
+       #     assert (-123).to_b.to_s  == "0x85"
+       redef fun to_s do
+               var nslen = byte_to_s_len
+               var ns = new NativeString(nslen + 1)
+               ns[nslen] = '\0'
+               native_byte_to_s(ns, nslen + 1)
+               return ns.to_s_with_length(nslen)
+       end
+end
+
 redef class Int
 
        # Wrapper of strerror C function