def test_vararg(self):
if not sys.platform.startswith('linux'):
py.test.skip("probably no symbol 'stderr' in the lib")
ffi = FFI(backend=self.Backend())
ffi.cdef("""
int fprintf(void *, const char *format, ...);
void *stderr;
""")
ffi.C = ffi.dlopen(None)
with FdWriteCapture() as fd:
ffi.C.fprintf(ffi.C.stderr, b"hello with no arguments\n")
ffi.C.fprintf(ffi.C.stderr, b"hello, %s!\n",
ffi.new("char[]", b"world"))
ffi.C.fprintf(ffi.C.stderr, ffi.new("char[]", b"hello, %s!\n"),
ffi.new("char[]", b"world2"))
ffi.C.fprintf(ffi.C.stderr,
b"hello int %d long %ld long long %lld\n",
ffi.cast("int", 42), ffi.cast("long", 84),
ffi.cast("long long", 168))
ffi.C.fprintf(ffi.C.stderr, b"hello %p\n", ffi.NULL)
res = fd.getvalue()
assert res == (b"hello with no arguments\n"
b"hello, world!\n"
b"hello, world2!\n"
b"hello int 42 long 84 long long 168\n"
b"hello (nil)\n")
def test_function_pointer(self):
ffi = FFI(backend=self.Backend())
def cb(charp):
assert repr(charp).startswith("<cdata 'char *' 0x")
return 42
fptr = ffi.callback("int(*)(const char *txt)", cb)
assert fptr != ffi.callback("int(*)(const char *)", cb)
assert repr(fptr) == "<cdata 'int(*)(char *)' calling %r>" % (cb, )
res = fptr(b"Hello")
assert res == 42
#
if not sys.platform.startswith('linux'):
py.test.skip("probably no symbol 'stderr' in the lib")
ffi.cdef("""
int fputs(const char *, void *);
void *stderr;
""")
ffi.C = ffi.dlopen(None)
fptr = ffi.cast("int(*)(const char *txt, void *)", ffi.C.fputs)
assert fptr == ffi.C.fputs
assert repr(fptr).startswith("<cdata 'int(*)(char *, void *)' 0x")
with FdWriteCapture() as fd:
fptr(b"world\n", ffi.C.stderr)
res = fd.getvalue()
assert res == b'world\n'
def test_fputs_without_const(self):
if not sys.platform.startswith('linux'):
py.test.skip("probably no symbol 'stderr' in the lib")
ffi = FFI(backend=self.Backend())
ffi.cdef("""
int fputs(char *, void *);
void *stderr;
""")
ffi.C = ffi.dlopen(None)
ffi.C.fputs # fetch before capturing, for easier debugging
with FdWriteCapture() as fd:
ffi.C.fputs(b"hello\n", ffi.C.stderr)
ffi.C.fputs(b" world\n", ffi.C.stderr)
res = fd.getvalue()
assert res == b'hello\n world\n'