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Diffstat (limited to 'src/stdlib/malloc.c')
| -rw-r--r-- | src/stdlib/malloc.c | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/src/stdlib/malloc.c b/src/stdlib/malloc.c deleted file mode 100644 index 82a6f54..0000000 --- a/src/stdlib/malloc.c +++ /dev/null @@ -1,134 +0,0 @@ -/** - * slibc — Yet another C library - * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ -#include <stdlib.h> -#include <slibc-alloc.h> -#include <strings.h> -#include <sys/mman.h> - - - -/** - * Create a new memory allocation on the heap. - * The allocation will not be initialised. - * - * @param size The size of the allocation. - * @return Pointer to the beginning of the new allocation. - * If `size` is zero, this function will either return - * `NULL` (that is what this implement does) or return - * a unique pointer that can later be freed with `free`. - * `NULL` is returned on error, and `errno` is set to - * indicate the error. - * - * @throws ENOMEM The process cannot allocate more memory. - */ -void* malloc(size_t size) -{ - /* TODO implement implementation of malloc */ - char* ptr; - if (size == 0) - return NULL; - ptr = mmap(NULL, sizeof(size_t) + size, (PROT_READ | PROT_WRITE), - (MAP_PRIVATE | MAP_ANONYMOUS), -1, 0); - *(size_t*)ptr = size; - return ptr + sizeof(size_t); -} - - -/** - * Variant of `malloc` that clears the allocation with zeroes. - * - * `p = calloc(n, m)` is equivalent to - * `(p = malloc(n * m), p ? (explicit_bzero(p, n * m), p) : NULL)` - * - * @param elem_count The number of elements to allocate. - * @param elem_size The size of each element. - * @return Pointer to the beginning of the new allocation. - * If `elem_count` or `elem_size` is zero, this function - * will either return `NULL` (that is what this implement - * does) or return a unique pointer that can later be - * freed with `free`. `NULL` is returned on error, and - * `errno` is set to indicate the error. - * - * @throws ENOMEM The process cannot allocate more memory. - */ -void* calloc(size_t elem_count, size_t elem_size) -{ - void* ptr = malloc(elem_count * elem_size); - if (ptr != NULL) - explicit_bzero(ptr, elem_count * elem_size); - return ptr; -} - - -/** - * Variant of `malloc` that extends, or shrinks, an existing allocation, - * if beneficial and possible, or creates a new allocation with the new - * size, copies the data, and frees the old allocation. - * - * On error, `ptr` is not freed. - * - * @param ptr Pointer to the beginning of the old memory allocation. - * The process may crash if it does not point to the - * beginning of a memory allocation on the heap. - * However, if it is `NULL`, this function will behave - * like `malloc`. - * @param size The new allocation size. If zero, this function will - * behave like `free`, and will return `NULL`. - * @return Pointer to the beginning of the new allocation. - * If `size` is zero, `NULL` is returned. On error `NULL` - * is returned and `errno` is set to indicate the error. - * - * @throws ENOMEM The process cannot allocate more memory. - */ -void* realloc(void* ptr, size_t size) -{ - return fast_realloc(ptr, size); -} - - -/** - * Free a memory allocation. - * - * @param ptr Pointer to the beginning of the memory allocation. - * The process may crash if it does not point to the - * beginning of a memory allocation on the heap. - * However, if it is `NULL`, nothing will happen. - */ -void free(void* ptr) -{ - fast_free(ptr); -} - - -/** - * This function is identical to `free`. - * Any argument beyond the first argument, is ignored. - * - * This function uses variadic arguments because there - * there are multiple conflicting specifications for `cfree`. - * - * @param ptr Pointer to the beginning of the memory allocation. - * The process may crash if it does not point to the - * beginning of a memory allocation on the heap. - * However, if it is `NULL`, nothing will happen. - */ -void cfree(void* ptr, ...) -{ - fast_free(ptr); -} - |