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from cython.cimports.libc.stdlib import malloc
from cython.cimports.libc.string import strcpy, strlen
hello_world = cython.declare(cython.p_char, 'hello world')
n = cython.declare(cython.Py_ssize_t, strlen(hello_world))
@cython.cfunc
def c_call_returning_a_c_string() -> cython.p_char:
c_string: cython.p_char = cython.cast(cython.p_char, malloc(
(n + 1) * cython.sizeof(cython.char)))
if not c_string:
return cython.NULL # malloc failed
strcpy(c_string, hello_world)
return c_string
@cython.cfunc
def get_a_c_string(c_string_ptr: cython.pp_char,
length: cython.p_Py_ssize_t) -> cython.int:
c_string_ptr[0] = cython.cast(cython.p_char, malloc(
(n + 1) * cython.sizeof(cython.char)))
if not c_string_ptr[0]:
return -1 # malloc failed
strcpy(c_string_ptr[0], hello_world)
length[0] = n
return 0
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