da49f2e440
The return of memset is never checked. This patch explicitly ignore the return to avoid MISRA-C violations. The only directory excluded directory was ext/* since it contains only imported code. Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
141 lines
2.8 KiB
C
141 lines
2.8 KiB
C
/*
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* Copyright (c) 2018 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdlib.h>
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#include <zephyr.h>
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#include <init.h>
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#include <errno.h>
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#include <misc/mempool.h>
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#include <string.h>
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#include <logging/sys_log.h>
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#if (CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE > 0)
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K_MUTEX_DEFINE(malloc_mutex);
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SYS_MEM_POOL_DEFINE(z_malloc_mem_pool, &malloc_mutex, 16,
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CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE, 1, 4, .data);
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void *malloc(size_t size)
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{
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void *ret;
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ret = sys_mem_pool_alloc(&z_malloc_mem_pool, size);
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if (!ret) {
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errno = ENOMEM;
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}
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return ret;
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}
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static int malloc_prepare(struct device *unused)
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{
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ARG_UNUSED(unused);
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#ifdef CONFIG_USERSPACE
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k_object_access_all_grant(&malloc_mutex);
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#endif
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sys_mem_pool_init(&z_malloc_mem_pool);
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return 0;
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}
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SYS_INIT(malloc_prepare, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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#else /* No malloc arena */
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void *malloc(size_t size)
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{
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ARG_UNUSED(size);
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SYS_LOG_DBG("CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE is 0\n");
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errno = ENOMEM;
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return NULL;
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}
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#endif
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void free(void *ptr)
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{
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sys_mem_pool_free(ptr);
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}
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static bool size_t_mul_overflow(size_t a, size_t b, size_t *res)
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{
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#if __SIZEOF_SIZE_T__ == 4
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return __builtin_umul_overflow((unsigned int)a, (unsigned int)b,
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(unsigned int *)res);
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#else /* __SIZEOF_SIZE_T__ == 8 */
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return __builtin_umulll_overflow((unsigned long long)a,
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(unsigned long long)b,
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(unsigned long long *)res);
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#endif
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}
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void *calloc(size_t nmemb, size_t size)
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{
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void *ret;
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if (size_t_mul_overflow(nmemb, size, &size)) {
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errno = ENOMEM;
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return NULL;
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}
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ret = malloc(size);
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if (ret) {
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(void)memset(ret, 0, size);
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}
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return ret;
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}
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void *realloc(void *ptr, size_t requested_size)
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{
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struct sys_mem_pool_block *blk;
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size_t block_size, total_requested_size;
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void *new_ptr;
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if (requested_size == 0) {
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return NULL;
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}
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/* Stored right before the pointer passed to the user */
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blk = (struct sys_mem_pool_block *)((char *)ptr - sizeof(*blk));
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/* Determine size of previously allocated block by its level.
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* Most likely a bit larger than the original allocation
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*/
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block_size = _ALIGN4(blk->pool->base.max_sz);
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for (int i = 1; i <= blk->level; i++) {
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block_size = _ALIGN4(block_size / 4);
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}
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/* We really need this much memory */
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total_requested_size = requested_size +
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sizeof(struct sys_mem_pool_block);
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if (block_size >= total_requested_size) {
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/* Existing block large enough, nothing to do */
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return ptr;
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}
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new_ptr = malloc(requested_size);
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if (!new_ptr) {
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return NULL;
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}
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memcpy(new_ptr, ptr, block_size - sizeof(struct sys_mem_pool_block));
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free(ptr);
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return new_ptr;
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}
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void *reallocarray(void *ptr, size_t nmemb, size_t size)
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{
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if (size_t_mul_overflow(nmemb, size, &size)) {
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errno = ENOMEM;
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return NULL;
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}
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return realloc(ptr, size);
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}
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