diff options
| -rw-r--r-- | ext/dl/cptr.c | 24 | ||||
| -rw-r--r-- | test/dl/test_cptr.rb | 22 |
2 files changed, 43 insertions, 3 deletions
diff --git a/ext/dl/cptr.c b/ext/dl/cptr.c index cdcc23c727..393cc11650 100644 --- a/ext/dl/cptr.c +++ b/ext/dl/cptr.c @@ -331,7 +331,13 @@ rb_dlptr_to_str(int argc, VALUE argv[], VALUE self) return val; } -VALUE +/* + * call-seq: inspect + * + * Returns a string formatted with an easily readable representation of the + * internal state of the DL::CPtr + */ +static VALUE rb_dlptr_inspect(VALUE self) { struct ptr_data *data; @@ -386,7 +392,13 @@ rb_dlptr_cmp(VALUE self, VALUE other) return diff > 0 ? INT2NUM(1) : INT2NUM(-1); } -VALUE +/* + * call-seq: + * ptr + n => new cptr + * + * Returns a new DL::CPtr that has been advanced +n+ bytes. + */ +static VALUE rb_dlptr_plus(VALUE self, VALUE other) { void *ptr; @@ -398,7 +410,13 @@ rb_dlptr_plus(VALUE self, VALUE other) return rb_dlptr_new((char *)ptr + num, size - num, 0); } -VALUE +/* + * call-seq: + * ptr - n => new cptr + * + * Returns a new DL::CPtr that has been moved back +n+ bytes. + */ +static VALUE rb_dlptr_minus(VALUE self, VALUE other) { void *ptr; diff --git a/test/dl/test_cptr.rb b/test/dl/test_cptr.rb index 3c4b5e6867..43605f84ce 100644 --- a/test/dl/test_cptr.rb +++ b/test/dl/test_cptr.rb @@ -3,6 +3,28 @@ require_relative '../ruby/envutil' module DL class TestCPtr < TestBase + def test_minus + str = "hello world" + ptr = CPtr[str] + assert_equal ptr.to_s, (ptr + 3 - 3).to_s + end + + # TODO: what if the pointer size is 0? raise an exception? do we care? + def test_plus + str = "hello world" + ptr = CPtr[str] + new_str = ptr + 3 + assert_equal 'lo world', new_str.to_s + end + + def test_inspect + ptr = CPtr.new(0) + inspect = ptr.inspect + assert_match(/size=#{ptr.size}/, inspect) + assert_match(/free=#{ptr.free}/, inspect) + assert_match(/ptr=#{ptr.to_i}/, inspect) + end + def test_to_ptr_string str = "hello world" ptr = CPtr[str] |