diff options
Diffstat (limited to 'io.c')
-rw-r--r-- | io.c | 14 |
1 files changed, 12 insertions, 2 deletions
@@ -4212,8 +4212,18 @@ rb_io_ungetbyte(VALUE io, VALUE b) rb_io_check_byte_readable(fptr); if (NIL_P(b)) return Qnil; if (FIXNUM_P(b)) { - char cc = FIX2INT(b); - b = rb_str_new(&cc, 1); + int i = FIX2INT(b); + if (0 <= i && i <= UCHAR_MAX) { + unsigned char cc = i & 0xFF; + b = rb_str_new((const char *)&cc, 1); + } + else { + rb_raise(rb_eRangeError, + "integer % d too big to convert into `unsigned char'", i); + } + } + else if (RB_TYPE_P(b, T_BIGNUM)) { + rb_raise(rb_eRangeError, "bignum too big to convert into `unsigned char'"); } else { SafeStringValue(b); |