100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdint.h>
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#include <string.h>
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#include "alloc-util.h"
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#include "macro.h"
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#include "util.h"
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void* memdup(const void *p, size_t l) {
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void *ret;
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assert(l == 0 || p);
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ret = malloc(l);
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if (!ret)
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return NULL;
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memcpy(ret, p, l);
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return ret;
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}
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void* memdup_suffix0(const void *p, size_t l) {
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void *ret;
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assert(l == 0 || p);
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/* The same as memdup() but place a safety NUL byte after the allocated memory */
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ret = malloc(l + 1);
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if (!ret)
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return NULL;
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*((uint8_t*) mempcpy(ret, p, l)) = 0;
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return ret;
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}
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void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) {
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size_t a, newalloc;
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void *q;
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assert(p);
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assert(allocated);
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if (*allocated >= need)
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return *p;
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newalloc = MAX(need * 2, 64u / size);
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a = newalloc * size;
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/* check for overflows */
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if (a < size * need)
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return NULL;
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q = realloc(*p, a);
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if (!q)
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return NULL;
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*p = q;
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*allocated = newalloc;
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return q;
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}
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void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) {
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size_t prev;
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uint8_t *q;
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assert(p);
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assert(allocated);
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prev = *allocated;
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q = greedy_realloc(p, allocated, need, size);
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if (!q)
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return NULL;
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if (*allocated > prev)
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memzero(q + prev * size, (*allocated - prev) * size);
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return q;
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}
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