circuitpython/tests/unix/ffi_callback.py
David Lechner 3dc324d3f1 tests: Format all Python code with black, except tests in basics subdir.
This adds the Python files in the tests/ directory to be formatted with
./tools/codeformat.py.  The basics/ subdirectory is excluded for now so we
aren't changing too much at once.

In a few places `# fmt: off`/`# fmt: on` was used where the code had
special formatting for readability or where the test was actually testing
the specific formatting.
2020-03-30 13:21:58 +11:00

37 lines
648 B
Python

try:
import ffi
except ImportError:
print("SKIP")
raise SystemExit
def ffi_open(names):
err = None
for n in names:
try:
mod = ffi.open(n)
return mod
except OSError as e:
err = e
raise err
libc = ffi_open(("libc.so", "libc.so.0", "libc.so.6", "libc.dylib"))
qsort = libc.func("v", "qsort", "piip")
def cmp(pa, pb):
a = ffi.as_bytearray(pa, 1)
b = ffi.as_bytearray(pb, 1)
# print("cmp:", a, b)
return a[0] - b[0]
cmp_c = ffi.callback("i", cmp, "pp")
s = bytearray(b"foobar")
print("org string:", s)
qsort(s, len(s), 1, cmp_c)
print("qsort'ed:", s)