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from libc.setjmp cimport *
cdef void check_nonzero(jmp_buf ctx, int x) nogil:
if x == 0:
longjmp(ctx, 1)
def nonzero(int x):
"""
>>> nonzero(-1)
True
>>> nonzero(0)
False
>>> nonzero(1)
True
>>> nonzero(2)
True
"""
cdef jmp_buf ctx
if setjmp(ctx) == 0:
check_nonzero(ctx, x)
return True
else:
return False
from libc.string cimport strcpy
cdef char[256] error_msg
cdef jmp_buf error_ctx
cdef void error(char msg[]) nogil:
strcpy(error_msg,msg)
longjmp(error_ctx, 1)
cdef void c_call(int x) nogil:
if x<=0:
error(b"expected a positive value")
def execute_c_call(int x):
"""
>>> execute_c_call(+2)
>>> execute_c_call(+1)
>>> execute_c_call(+0)
Traceback (most recent call last):
...
RuntimeError: expected a positive value
>>> execute_c_call(-1)
Traceback (most recent call last):
...
RuntimeError: expected a positive value
"""
if not setjmp(error_ctx):
c_call(x)
else:
raise RuntimeError(error_msg.decode())
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