Mercurial > hg > toybox
view 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> |
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date | Fri, 03 Nov 2006 00:05:52 -0500 |
parents | 2a56fdc40035 |
children | 630b2e12db16 |
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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; }