sum 21 mp.c int i, sum; sum 23 mp.c sum = 0; sum 25 mp.c sum += addr[i]; sum 26 mp.c return sum; sum 38 mp.c if(memcmp(p, "_MP_", 4) == 0 && sum(p, sizeof(struct mp)) == 0) sum 85 mp.c if(sum((uchar*)conf, conf->length) != 0)