#include <alloca.h>

struct obj1
{
	struct obj1 *next;
};

struct obj2
{
	struct obj2 *next;
};

void
allocate(struct obj1 *sym)
{
	struct obj2 *head = 0;

	for (; sym; sym = sym->next)
	{
		struct obj2 **p, *n;

		for (p = &head; *p; p = &(*p)->next)
			if (sym->next)
				break;

		n = alloca(sizeof(*n));
		n->next = *p;
		*p = n;
	}
}