90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <malloc.h>
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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 "memory-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 ?: 1);
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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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if (_unlikely_(l == SIZE_MAX)) /* prevent overflow */
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return NULL;
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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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if (_unlikely_(need > SIZE_MAX/2)) /* Overflow check */
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return NULL;
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newalloc = need * 2;
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if (size_multiply_overflow(newalloc, size))
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return NULL;
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a = newalloc * size;
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if (a < 64) /* Allocate at least 64 bytes */
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a = 64;
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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 = _unlikely_(size == 0) ? newalloc : malloc_usable_size(q) / size;
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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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