vsu

#include <stddef.h>#include <alloca.h>struct obj_symbol{	struct obj_symbol *next;	unsigned int size;};struct common_entry{	struct common_entry *next;	struct obj_symbol *sym;};extern void do_something(struct obj_symbol *sym);void obj_allocate_commons(struct obj_symbol *sym){	struct common_entry *common_head = NULL;	for (; sym ; sym = sym->next) {		struct common_entry **p, *n;		for (p = &common_head; *p ; p = &(*p)->next)			if (sym->size <= (*p)->sym->size)				break;		n = alloca(sizeof(*n));		n->next = *p;		n->sym = sym;		*p = n;	}	{		struct common_entry *p;		for (p = common_head; p ; p = p->next)			do_something(p->sym);	}}