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[hash] Add a couple of data-oriented functions
Hash_Select returns a list of elements that match a given criterion (select callback returning non-0). Hash_ForEach simply calls a function for every element.
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2 changed files with 65 additions and 0 deletions
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@ -38,6 +38,8 @@
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typedef struct hashtab_s hashtab_t;
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typedef struct hashlink_s hashlink_t;
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typedef int (*hash_select_t) (void *ele, void *data);
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typedef void (*hash_action_t) (void *ele, void *data);
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/** create a new hash table.
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\param tsize table size. larger values will give better distribution, but
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@ -213,6 +215,32 @@ size_t Hash_NumElements (hashtab_t *tab) __attribute__((pure));
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*/
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void **Hash_GetList (hashtab_t *tab);
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/** list of all matching elements in the table.
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\param tab the table to search
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\param select function that tests for a match. The expected return value
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is 0 for no match, non-zero for a match.
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\param data context data passed to the \a select function
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\return a null terminated list of element pointers for all matchin
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elements in the table
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\note it is the caller's responsibilty to free() the list.
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returned list is guaranteed to be in reverse order of insertion for
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elements with the same key. ie, deleting items from the list in list order
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will delete the correct items.
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*/
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void **Hash_Select (hashtab_t *tab, hash_select_t select, void *data);
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/** call a function for all elements in the table.
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\param tab the table to search
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\param action function to call for each elelemnt
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\param data context data passed to the \a action function
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call order is guaranteed to be in reverse order of insertion for
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elements with the same key
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*/
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void Hash_ForEach (hashtab_t *tab, hash_action_t action, void *data);
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/** dump statistics about the hash table
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\param tab the table to dump
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*/
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@ -447,6 +447,43 @@ Hash_GetList (hashtab_t *tab)
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return list;
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}
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VISIBLE void **
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Hash_Select (hashtab_t *tab, hash_select_t select, void *data)
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{
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void **list;
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void **l;
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size_t ind;
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l = list = malloc ((tab->num_ele + 1) * sizeof (void *));
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if (!list)
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return 0;
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for (ind = 0; ind < tab->tab_size; ind++) {
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hashlink_t *lnk;
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for (lnk = tab->tab[ind]; lnk; lnk = lnk->next) {
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if (select (lnk->data, data)) {
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*l++ = lnk->data;
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}
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}
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}
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*l++ = 0;
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return list;
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}
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VISIBLE void
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Hash_ForEach (hashtab_t *tab, hash_action_t action, void *data)
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{
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size_t ind;
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for (ind = 0; ind < tab->tab_size; ind++) {
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hashlink_t *lnk;
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for (lnk = tab->tab[ind]; lnk; lnk = lnk->next) {
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action (lnk->data, data);
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}
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}
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}
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static inline double
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sqr (double x)
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{
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