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	ztrunc.c - libzahl - big integer library
	git clone git://git.suckless.org/libzahl
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	---
	ztrunc.c (560B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "internals.h"
	3
	4
	5 void
	6 ztrunc(z_t a, z_t b, size_t bits)
	7 {
	8 size_t chars;
	9
	10 if (unlikely(zzero(b))) {
	11 SET_SIGNUM(a, 0);
	12 return;
	13 }
	14
	15 chars = CEILING_BITS_TO_CHARS(bits);
	16 a->used = MIN(chars, b->used);
	17 if (unlikely(a->used < chars))
	18 bits = 0;
	19 if (likely(a != b)) {
	20 a->sign = b->sign;
	21 ENSURE_SIZE(a, a->used);
	22 zmemcpy(a->chars, b->chars, a->used);
	23 }
	24 bits = BITS_IN_LAST_CHAR(bits);
	25 if (likely(bits))
	26 a->chars[a->used - 1] &= ((zahl_char_t)1 << bits) - 1;
	27
	28 TRIM_AND_ZERO(a);
	29 }