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/* See LICENSE file for copyright and license details. */
#include "internals.h"
void
libzahl_realloc(z_t a, size_t need)
{
#if defined(__clang__) /* https://llvm.org/bugs/show_bug.cgi?id=26930 */
volatile size_t j;
#else
# define j i
#endif
size_t i, x;
zahl_char_t *new;
/* Find n such that n is a minimal power of 2 ≥ need. */
if (likely((need & (~need + 1)) != need)) {
need |= need >> 1;
need |= need >> 2;
need |= need >> 4;
for (j = sizeof(need), x = 8; j; j >>= 1, x <<= 1)
need |= need >> x;
need += 1;
}
i = libzahl_msb_nz_zu(need);
if (likely(libzahl_pool_n[i])) {
libzahl_pool_n[i]--;
new = libzahl_pool[i][libzahl_pool_n[i]];
zmemcpy(new, a->chars, a->alloced);
zfree(a);
a->chars = new;
} else {
a->chars = realloc(a->chars, need * sizeof(zahl_char_t));
if (!a->chars) {
if (!errno) /* sigh... */
errno = ENOMEM;
libzahl_failure(errno);
}
}
a->alloced = need;
}
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