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