malloc not working

[Guest]

Someone from CCS, I need to know how __DYNAMIC_HEAD works.
Somehow, when I call the malloc function, it keeps looping and never returns anything.

char *malloc(size_t size)
{
node_t *node,*new;
long nsize;
node=__DYNAMIC_HEAD;
while(node!=NULL) // chk until end of memlist
{
if(!bit_test(node->size,pos) && node->size >=size) // node is free and > = req size
{
nsize=node->size;
update_node(node,size+csize);
if(nsize>size) //node > req size, so split and add new node to memlist
{
new=create_node(nsize-size-sizeof(node_t),(long)node+sizeof(node_t)+size);
insert_node_after(node,new);
}//end if
break;
}//end if
node=node->next;
}//end while
if(node==NULL)// reached end without finding an appropriate node
{
//printf("\r\n Not enough memory for allocation");
return NULL;
}
else
return (char *)node+sizeof(node_t); // return pointer to allocated space
}


The condition is the if statement in bold is never true, so the malloc function just keep looping node after node.
What's going on?

[ckielstra]

[Guest]

I am pretty sure that malloc never returns. I simulated my program using MPLAB, and the malloc function just keeps looping.
What really sucks is that when I write a small test small program, malloc works somehow. But Malloc is unable to allocate 41 bytes in my larger program.
That's why I wanted to know a little bit more about __DYNAMIC_HEAD.
Maybe my larger program has an influence on it.

[Guest]

Here is some code.

The code that calls malloc is:

[Guest]

I Found the solution to my problem.

I chaged the definition of size_t in <stddef.h>

from #define size_t int

to #define size_t long

my memory allocation is working fine now.