Mercurial > hg > toybox
diff lib/llist.c @ 20:3981c96f9285
Implement which. Add hello world to menuconfig. Wrap the various applet main
functions in main.c with USE() macros so --gc-sections can strip them.
author | Rob Landley <rob@landley.net> |
---|---|
date | Fri, 03 Nov 2006 00:05:52 -0500 |
parents | 2a56fdc40035 |
children | 630b2e12db16 |
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--- a/lib/llist.c Thu Nov 02 19:50:02 2006 -0500 +++ b/lib/llist.c Fri Nov 03 00:05:52 2006 -0500 @@ -12,10 +12,21 @@ void llist_free(void *list, void (*freeit)(void *data)) { while (list) { - void **next = (void **)list; - void *list_next = *next; - if (freeit) freeit(list); - free(list); - list = list_next; + 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; +}