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/* See LICENSE file for copyright and license details. */
#include "internals.h"
#include <stdio.h>
/* Find r such that r is a minimal power of 2 ≥ n. */
#define NEXT_2POW(n)\
do if (likely((n & (~n + 1)) != n)) {\
size_t x;\
n |= n >> 1;\
n |= n >> 2;\
n |= n >> 4;\
for (i = sizeof(n), x = 8; i; i >>= 1, x <<= 1)\
n |= n >> x;\
n += 1;\
} while (0)
#if defined(__clang__)
static inline __attribute__((optnone)) size_t
clang_warkaround_next_2pow(size_t need)
{
size_t i;
NEXT_2POW(need);
return need;
}
#endif
void
libzahl_realloc(z_t a, size_t need)
{
size_t i;
zahl_char_t *new;
#if defined(__clang__)
need = clang_warkaround_next_2pow(need);
#else
NEXT_2POW(need);
#endif
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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