annotate 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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1 /* vi: set sw=4 ts=4 :
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2 * llist.c - Linked list functions
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3 *
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4 * Linked list structures have a next pointer as their first element.
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5 */
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6
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7 #include "toys.h"
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8
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9 // Free all the elements of a linked list
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10 // if freeit!=NULL call freeit() on each element before freeing it.
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11
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12 void llist_free(void *list, void (*freeit)(void *data))
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13 {
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14 while (list) {
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15 void *pop = llist_pop(&list);
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16 if (freeit) freeit(pop);
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17 }
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18 }
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19
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20 // Return the first item from the list, advancing the list (which must be called
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21 // as &list)
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22 void *llist_pop(void *list)
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23 {
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24 // I'd use a void ** for the argument, and even accept the typecast in all
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25 // callers as documentation you need the &, except the stupid compiler
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26 // would then scream about type-punned pointers. Screw it.
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27 void **llist = (void **)list;
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28 void **next = (void **)*llist;
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29 *llist = *next;
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30
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31 return (void *)next;
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32 }