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	zor.c - libzahl - big integer library
	git clone git://git.suckless.org/libzahl
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	---
	zor.c (878B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "internals.h"
	3
	4
	5 void
	6 zor(z_t a, z_t b, z_t c)
	7 {
	8 size_t n, m;
	9
	10 if (unlikely(zzero(b))) {
	11 SET(a, c);
	12 return;
	13 } else if (unlikely(zzero(c))) {
	14 SET(a, b);
	15 return;
	16 }
	17
	18 MIN_MAX_1(n, m, b->used, c->used);
	19 ENSURE_SIZE(a, m);
	20
	21 if (a == b) {
	22 ZMEM_2OP_PRECISE(a->chars, a->chars, c->chars, n, \|);
	23 if (a->used < c->used)
	24 zmemcpy_range(a->chars, c->chars, n, m);
	25 } else if (unlikely(a == c)) {
	26 ZMEM_2OP_PRECISE(a->chars, a->chars, b->chars, n, \|);
	27 if (a->used < b->used)
	28 zmemcpy_range(a->chars, b->chars, n, m);
	29 } else if (m == b->used) {
	30 ZMEM_2OP(a->chars, c->chars, b->chars, n, \|);
	31 zmemcpy_range(a->chars, b->chars, n, m);
	32 } else {
	33 ZMEM_2OP(a->chars, b->chars, c->chars, n, \|);
	34 zmemcpy_range(a->chars, c->chars, n, m);
	35 }
	36
	37 a->used = m;
	38 SET_SIGNUM(a, zpositive2(b, c) * 2 - 1);
	39 }