New issue 3172: memoryview of LitteleEndianStructure cause error
https://bitbucket.org/pypy/pypy/issues/3172/memoryview-of-litteleendianstructure-cause
Hiroshi Miura:
When adding following test case in extra\_tests/ctypes\_test/test\_structure.py
```
def test_memoryview_endian():
class LES(LittleEndianStructure):
_pack_ = 1
_fields_ = [
('a', c_ubyte * 16),
('i', c_uint64)
]
c_les = LES()
mv = memoryview(c_les)
```
The test fails as TypeError on pypy3.6.9 -7.3.1 alpha with following log.
```
$ pypy3 -m pytest extra_tests/ctypes_tests/test_structures.py
========================================================= test session starts
==========================================================
platform linux -- Python 3.6.9[pypy-7.3.1-alpha], pytest-2.9.2, py-1.4.29,
pluggy-0.3.1
rootdir: /home/miurahr/projects/pypy/extra_tests, inifile: pytest.ini
collected 15 items
extra_tests/ctypes_tests/test_structures.py ..............F
=============================================================== FAILURES
===============================================================
________________________________________________________ test_memoryview_endian
________________________________________________________
def test_memoryview_endian():
class LES(LittleEndianStructure):
_pack_ = 1
_fields_ = [
('a', c_ubyte * 16),
('i', c_uint64)
]
c_les = LES()
> mv = memoryview(c_les)
extra_tests/ctypes_tests/test_structures.py:217:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/opt/pypy3/lib_pypy/_ctypes/structure.py:309: in __buffer__
fmt = get_format_str(self)
/opt/pypy3/lib_pypy/_ctypes/array.py:309: in get_format_str
ch = get_format_str(obj)[1:]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
typ = <class '_ctypes.array.c_ubyte_Array_16'>
def get_format_str(typ):
if hasattr(typ, '_fields_'):
if hasattr(typ, '_swappedbytes_'):
bo = swappedorder[sys.byteorder]
else:
bo = byteorder[sys.byteorder]
flds = []
cum_size = 0
for name, obj in typ._fields_:
padding = typ._ffistruct_.fieldoffset(name) - cum_size
if padding:
flds.append('%dx' % padding)
# Trim off the leading '<' or '>'
ch = get_format_str(obj)[1:]
if (ch) == 'B':
flds.append(byteorder[sys.byteorder])
else:
flds.append(bo)
flds.append(ch)
flds.append(':')
flds.append(name)
flds.append(':')
cum_size += typ._ffistruct_.fieldsize(name)
return 'T{' + ''.join(flds) + '}'
elif hasattr(typ, '_type_'):
ch = typ._type_
> return byteorder[sys.byteorder] + ch
E TypeError: unsupported operand type(s) for +: 'str' and 'SimpleType'
/opt/pypy3/lib_pypy/_ctypes/array.py:322: TypeError
======================================== 1 failed, 14 passed, 1 pytest-warnings
in 0.49 seconds ========================================
miurahr@miurahr-note:~/projects/pypy$
```
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