diff options
| -rw-r--r-- | miscutils/bc.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c index 8426998..8f326d2 100644 --- a/miscutils/bc.c +++ b/miscutils/bc.c @@ -1601,46 +1601,44 @@ static ssize_t bc_num_cmp(BcNum *a, BcNum *b) { size_t i, min, a_int, b_int, diff; BcDig *max_num, *min_num; - bool a_max, neg = false; + bool a_max, neg; ssize_t cmp; if (a == b) return 0; if (a->len == 0) return BC_NUM_NEG(!!b->len, !b->neg); if (b->len == 0) return BC_NUM_NEG(1, a->neg); - if (a->neg) { - if (b->neg) - neg = true; - else - return -1; - } - else if (b->neg) - return 1; + + if (a->neg != b->neg) // signs of a and b differ + // +a,-b = a>b = 1 or -a,+b = a<b = -1 + return (int)b->neg - (int)a->neg; + neg = a->neg; // 1 if both negative, 0 if both positive a_int = BC_NUM_INT(a); b_int = BC_NUM_INT(b); a_int -= b_int; - a_max = (a->rdx > b->rdx); if (a_int != 0) return (ssize_t) a_int; + a_max = (a->rdx > b->rdx); if (a_max) { min = b->rdx; diff = a->rdx - b->rdx; max_num = a->num + diff; min_num = b->num; - } - else { + // neg = (a_max == neg); - NOP (maps 1->1 and 0->0) + } else { min = a->rdx; diff = b->rdx - a->rdx; max_num = b->num + diff; min_num = a->num; + neg = !neg; // same as "neg = (a_max == neg)" } cmp = bc_num_compare(max_num, min_num, b_int + min); - if (cmp != 0) return BC_NUM_NEG(cmp, (!a_max) != neg); + if (cmp != 0) return BC_NUM_NEG(cmp, neg); for (max_num -= diff, i = diff - 1; i < diff; --i) { - if (max_num[i]) return BC_NUM_NEG(1, (!a_max) != neg); + if (max_num[i]) return BC_NUM_NEG(1, neg); } return 0; |