for_each in C

for_each.c

#include <malloc.h>
#include <string.h>
#include <stdio.h>

#define for_each(i, list)		\
	for(i = list; 			\
		i != NULL; 		\
		i = i->next)

struct lista {
	char data;
	struct lista* next;
};

int main(void)
{
	struct lista l;
	l.data = 'a';
	l.next = malloc(sizeof(struct lista));
	l.next->data = 'b';
	l.next->next = NULL;

	struct lista* k;
	for_each(k, &l) {
		printf("%c\n", k->data);
	}

}