gen: bytes array print not ending prematurely when null byte (#6401)

vlib/builtin/int.v

@@ -383,6 +383,22 @@ pub fn (b byte) str() string {
 	return str
 }
 
+pub fn (b byte) str_escaped() string {
+	str := match b {
+		0 { '`\\' + '0`' } // Bug is preventing \\0 in a literal
+		7 { '`\\a`' }
+		8 { '`\\b`' }
+		9 { '`\\t`' }
+		10 { '`\\n`' }
+		11 { '`\\v`' }
+		12 { '`\\f`' }
+		13 { '`\\r`' }
+		32...126 { b.str() }
+		else { '0x' + b.hex() }
+	}
+	return str
+}
+
 // TODO generic
 pub fn (a []byte) contains(val byte) bool {
 	for aa in a {

vlib/v/gen/auto_str_methods.v

@@ -74,6 +74,9 @@ fn (mut g Gen) gen_str_for_array(info table.Array, styp, str_fn_name string) {
 	if sym_has_str_method {
 		elem_str_fn_name = if is_elem_ptr { field_styp.replace('*', '') + '_str' } else { field_styp +
 				'_str' }
+		if sym.kind == .byte {
+			elem_str_fn_name = elem_str_fn_name + '_escaped'
+		}
 	} else {
 		elem_str_fn_name = styp_to_str_fn_name(field_styp)
 	}

vlib/v/tests/array_to_string_test.v

@@ -13,6 +13,9 @@ fn test_array_to_string_conversion() {
 
 	e := [i64(1), 2, 3]
 	assert e.str() == '[1, 2, 3]'
+
+	f := [byte(66), 32, 126, 10, 13, 5, 18, 127, 255]
+	assert f.str() == '[B,  , ~, `\\n`, `\\r`, 0x05, 0x12, 0x7f, 0xff]'
 }
 
 fn test_interpolation_array_to_string() {