umalloc

A tiny Unix dynamic memory allocator library. The allocated memory is divided into 4 parts:

 -------------------------------------------------
|          |          |               |          |
|chunk_size|head_guard|    chunk      |tail_guard|
|          |          |               |          |
 ------------------------------------------------- 

Besides the allocated memory are initialized to 0, when free the memory, it will check following cases:

(1) Both up and down out-of-bound memory error;
(2) Double-free pointer error.

Usage

$ git clone https://github.com/NanXiao/umalloc.git
$ cd umalloc
$ make && make install

Example:

#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <umalloc.h>

int main(void)
{
    uint32_t size = 1;
    for (size = 1; size < UINT32_MAX; size++)
    {
        printf("size=%" PRIu32 "\n", size);
        char *p = umalloc(size);
        memset(p, 0xFF, size);
        p = urealloc(p, size - 1);
        p = urealloc(p, size);
        ufree(p);
    }
    return 0;
}

Build and run it:

$ cc -I/usr/local/include -L/usr/local/lib -Wall -o test test.c -lumalloc
$ ./test