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	zxor.c - libzahl - big integer library
	git clone git://git.suckless.org/libzahl
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	---
	zxor.c (984B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "internals.h"
	3
	4
	5 void
	6 zxor(z_t a, z_t b, z_t c)
	7 {
	8 size_t n, m, bn, cn;
	9 const zahl_char_t *restrict bc;
	10 const zahl_char_t *restrict cc;
	11
	12 if (unlikely(zzero(b))) {
	13 SET(a, c);
	14 return;
	15 } else if (unlikely(zzero(c))) {
	16 SET(a, b);
	17 return;
	18 }
	19
	20 bn = b->used;
	21 bc = b->chars;
	22 cn = c->used;
	23 cc = c->chars;
	24
	25 MIN_MAX_1(n, m, bn, cn);
	26 ENSURE_SIZE(a, m);
	27
	28 if (a == b) {
	29 ZMEM_2OP_PRECISE(a->chars, a->chars, cc, n, ^);
	30 if (a->used < cn)
	31 zmemcpy_range(a->chars, cc, n, m);
	32 } else if (unlikely(a == c)) {
	33 ZMEM_2OP_PRECISE(a->chars, a->chars, bc, n, ^);
	34 if (a->used < bn)
	35 zmemcpy_range(a->chars, bc, n, m);
	36 } else if (m == bn) {
	37 ZMEM_2OP(a->chars, c->chars, b->chars, n, ^);
	38 zmemcpy_range(a->chars, b->chars, n, m);
	39 } else {
	40 ZMEM_2OP(a->chars, b->chars, c->chars, n, ^);
	41 zmemcpy_range(a->chars, c->chars, n, m);
	42 }
	43
	44 a->used = m;
	45 TRIM_AND_SIGN(a, 1 - 2 * ((zsignum(b) ^ zsignum(c)) < 0));
	46 }