Hyperion Entertainment Message Boards

Code: Select all

#include <stdio.h>
#include <stdlib.h>

#include <proto/exec.h>

#define ALLOC_MAX 100 * 1024 *1024
#define ALLOC_STEP 64

int main(void)
{
	int i = ALLOC_STEP;
	void *memptr = NULL;
	int temp = 0;
	
	memptr = IExec->AllocVec(i, MEMF_PRIVATE);
	
	while(i < ALLOC_MAX) {
		i += ALLOC_STEP;
		temp = IExec->ReallocVec(memptr, i, 0);
		if(temp != i) break;
	}
	
	printf("freeing %ld bytes\n", i);
	IExec->FreeVec(memptr);
	return 0;
}

Code: Select all

#include <stdlib.h>
#include <string.h>

void *my_malloc(size_t size) {
    void *ptr = malloc(sizeof(size_t) + size);
    if (ptr) {
        *(size_t *)ptr = size;
        ptr = (size_t *)ptr + 1;
    }
    return ptr;
}

void my_free(void *ptr) {
    if (ptr) {
        ptr = (size_t *)ptr - 1;
        free(ptr);
    }
}

#ifndef MIN
#define MIN(a,b) ((a)<(b)?(a):(b))
#endif

void *my_realloc(void *optr, size_t nsize) {
	size_t osize = optr ? *((size_t *)optr - 1) : 0;
    void *nptr = my_malloc(nsize);
    if (nptr) memcpy(nptr, optr, MIN(osize,nsize));
    if (optr) my_free(optr);
    return nptr;
}

#define malloc(size) my_malloc(size)
#define realloc(ptr,size) my_realloc(ptr,size)
#define free(ptr) my_free(ptr)

Code: Select all

#include <stdlib.h>
#include <string.h>

#ifndef MIN
#define MIN(a,b) ((a)<(b)?(a):(b))
#endif

void *my_realloc(void *optr, size_t nsize) {
    size_t osize = optr ? malloc_usable_size(optr) : 0;
    void *nptr = malloc(nsize);
    if (nptr) memcpy(nptr, optr, MIN(osize,nsize));
    if (optr) free(optr);
    return nptr;
}

#define realloc(ptr,size) my_realloc(ptr,size)