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/* vi: set sw=4 ts=4 :
* llist.c - Linked list functions
*
* Linked list structures have a next pointer as their first element.
*/
#include "toys.h"
// Free all the elements of a linked list
// if freeit!=NULL call freeit() on each element before freeing it.
void llist_free(void *list, void (*freeit)(void *data))
{
while (list) {
void *pop = llist_pop(&list);
if (freeit) freeit(pop);
}
}
// Return the first item from the list, advancing the list (which must be called
// as &list)
void *llist_pop(void *list)
{
// I'd use a void ** for the argument, and even accept the typecast in all
// callers as documentation you need the &, except the stupid compiler
// would then scream about type-punned pointers. Screw it.
void **llist = (void **)list;
void **next = (void **)*llist;
*llist = *next;
return (void *)next;
}
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