source: asp3_tinet_ecnl_arm/trunk/musl-1.1.18/src/malloc/lite_malloc.c@ 352

#include <stdlib.h>
#include <stdint.h>
#include <limits.h>
#include <errno.h>
#include "libc.h"

#define ALIGN 16

void *__expand_heap(size_t *);

static void *__simple_malloc(size_t n)
{
        static char *cur, *end;
        static volatile int lock[2];
        size_t align=1, pad;
        void *p;

        if (!n) n++;
        while (align<n && align<ALIGN)
                align += align;

        LOCK(lock);

        pad = -(uintptr_t)cur & align-1;

        if (n <= SIZE_MAX/2 + ALIGN) n += pad;

        if (n > end-cur) {
                size_t m = n;
                char *new = __expand_heap(&m);
                if (!new) {
                        UNLOCK(lock);
                        return 0;
                }
                if (new != end) {
                        cur = new;
                        n -= pad;
                        pad = 0;
                }
                end = new + m;
        }

        p = cur + pad;
        cur += n;
        UNLOCK(lock);
        return p;
}

weak_alias(__simple_malloc, malloc);
weak_alias(__simple_malloc, __malloc0);