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import sys
import cffi
#
# This is only a demo based on the GMP library.
# There is a rather more complete version available at:
# http://bazaar.launchpad.net/~tolot-solar-empire/+junk/gmpy_cffi/files
#
ffi = cffi.FFI()
ffi.cdef("""
typedef struct { ...; } MP_INT;
typedef MP_INT mpz_t[1];
int mpz_init_set_str (MP_INT *dest_integer, char *src_cstring, int base);
void mpz_add (MP_INT *sum, MP_INT *addend1, MP_INT *addend2);
char * mpz_get_str (char *string, int base, MP_INT *integer);
""")
lib = ffi.verify("#include <gmp.h>",
libraries=['gmp', 'm'])
# ____________________________________________________________
a = ffi.new("mpz_t")
b = ffi.new("mpz_t")
lib.mpz_init_set_str(a, sys.argv[1], 10) # Assume decimal integers
lib.mpz_init_set_str(b, sys.argv[2], 10) # Assume decimal integers
lib.mpz_add(a, a, b) # a=a+b
s = lib.mpz_get_str(ffi.NULL, 10, a)
print ffi.string(s)
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