library.cairo

# SPDX-License-Identifier: MIT
# OpenZeppelin Contracts for Cairo v0.2.1 (security/reentrancyguard/library.cairo)

%lang starknet

from starkware.cairo.common.cairo_builtins import HashBuiltin
from starkware.cairo.common.bool import TRUE, FALSE

@storage_var
func ReentrancyGuard_entered() -> (res: felt):
end

namespace ReentrancyGuard:

    func _start{
            syscall_ptr: felt*,
            pedersen_ptr: HashBuiltin*,
            range_check_ptr
        }():
        let (has_entered) = ReentrancyGuard_entered.read()
        with_attr error_message("ReentrancyGuard: reentrant call"):
            assert has_entered = FALSE
        end
        ReentrancyGuard_entered.write(TRUE)
        return ()
    end

    func _end{
            syscall_ptr: felt*,
            pedersen_ptr: HashBuiltin*,
            range_check_ptr
        }():
        ReentrancyGuard_entered.write(FALSE)
        return ()
    end

end