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annotate lib/llist.c @ 1108:fb8467436e6a draft

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Tweak terminal_size to never set either to 0, and return true/false whether it could determine at least one coordinate. (If you set $COLUMNS but not $ROWS, we assume you're happy with the 80x25 default for the other.)
author Rob Landley <rob@landley.net>
date Thu, 07 Nov 2013 09:04:50 -0600
parents c2663b7eca78
children 114ec0ab161c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* llist.c - Linked list functions
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2 *
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3 * Linked list structures have a next pointer as their first element.
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4 */
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5
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6 #include "toys.h"
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7
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1e8b9acdafeb Genericize llist code a bit: rename llist_free() to llist_traverse(), and no longer accept NULL as a synonym for free.
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8 // Call a function (such as free()) on each element of a linked list.
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9 void llist_traverse(void *list, void (*using)(void *data))
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10 {
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11 void *old = list;
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13 while (list) {
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14 void *pop = llist_pop(&list);
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15 using(pop);
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17 // End doubly linked list too.
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18 if (old == list) break;
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19 }
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20 }
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22 // Return the first item from the list, advancing the list (which must be called
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23 // as &list)
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24 void *llist_pop(void *list)
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25 {
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26 // I'd use a void ** for the argument, and even accept the typecast in all
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27 // callers as documentation you need the &, except the stupid compiler
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28 // would then scream about type-punned pointers. Screw it.
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29 void **llist = (void **)list;
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30 void **next = (void **)*llist;
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31 *llist = *next;
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33 return (void *)next;
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34 }
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35
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36 void *dlist_pop(void *list)
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37 {
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38 struct double_list **pdlist = (struct double_list **)list, *dlist = *pdlist;
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39
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40 if (dlist->next == dlist) *pdlist = 0;
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41 else {
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42 dlist->next->prev = dlist->prev;
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43 dlist->prev->next = *pdlist = dlist->next;
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44 }
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45
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46 return dlist;
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47 }
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48
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49 void dlist_add_nomalloc(struct double_list **list, struct double_list *new)
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50 {
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51 if (*list) {
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52 new->next = *list;
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53 new->prev = (*list)->prev;
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54 (*list)->prev->next = new;
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55 (*list)->prev = new;
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56 } else *list = new->next = new->prev = new;
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57 }
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59
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60 // Add an entry to the end of a doubly linked list
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61 struct double_list *dlist_add(struct double_list **list, char *data)
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62 {
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63 struct double_list *new = xmalloc(sizeof(struct double_list));
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64
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65 new->data = data;
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66 dlist_add_nomalloc(list, new);
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67
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68 return new;
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69 }