errno.jou

# C's errno is actually a macro that expands to a function call.
# The function name varies by platform.
if WINDOWS:
    declare _errno() -> int*
elif MACOS:
    declare __error() -> int*
elif NETBSD:
    declare __errno() -> int*
else:
    declare __errno_location() -> int*

# TODO: Ideally we would be able to place the if statements inside the functions.
if WINDOWS:
    def set_errno(value: int) -> None:
        *_errno() = value
    def get_errno() -> int:
        return *_errno()
elif MACOS:
    def set_errno(value: int) -> None:
        *__error() = value
    def get_errno() -> int:
        return *__error()
elif NETBSD:
    def set_errno(value: int) -> None:
        *__errno() = value
    def get_errno() -> int:
        return *__errno()
else:
    def set_errno(value: int) -> None:
        *__errno_location() = value
    def get_errno() -> int:
        return *__errno_location()

# Convert an error code into a string. Do not modify or free() the returned string.
declare strerror(errno_value: int) -> byte*