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/* See LICENSE file for copyright and license details. */
#include "internals.h"
void
zbset(z_t a, z_t b, size_t bit, int action)
{
zahl_char_t mask = 1;
size_t chars;
chars = FLOOR_BITS_TO_CHARS(bit);
bit = BITS_IN_LAST_CHAR(bit);
mask <<= bit;
SET(a, b);
if (action) {
if (zzero(a)) {
a->used = 0;
SET_SIGNUM(a, 1);
}
if (a->used <= chars) {
ENSURE_SIZE(a, chars + 1);
zmemset(a->chars + a->used, 0, chars + 1 - a->used);
a->used = chars + 1;
}
}
if (action > 0) {
a->chars[chars] |= mask;
return;
} else if (action < 0) {
a->chars[chars] ^= mask;
} else if (chars < a->used) {
a->chars[chars] &= ~mask;
}
TRIM(a);
if (!a->used)
SET_SIGNUM(a, 0);
}
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