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python: add cutil.from_optional_dc_charpointer()

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`cutil.from_dc_charpointer()` is guaranteed to return `str`, while
`cutil.from_optional_dc_charpointer()` may return `None` if C function
returns `NULL`.
This commit is contained in:
link2xt
2021-11-21 13:22:49 +00:00
parent 30a3eeece8
commit ddefd2cf09
6 changed files with 43 additions and 38 deletions
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8
python/src/deltachat/cutil.py
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@@ -19,7 +19,13 @@ def iter_array(dc_array_t, constructor: Callable[[int], T]) -> Generator[T, None
yield constructor(lib.dc_array_get_id(dc_array_t, i))
def from_dc_charpointer(obj) -> Optional[str]:
def from_dc_charpointer(obj) -> str:
if obj != ffi.NULL:
return ffi.string(ffi.gc(obj, lib.dc_str_unref)).decode("utf8")
raise ValueError
def from_optional_dc_charpointer(obj) -> Optional[str]:
if obj != ffi.NULL:
return ffi.string(ffi.gc(obj, lib.dc_str_unref)).decode("utf8")
return None