+++ /dev/null
-/* -*-c-*-
- *
- * Assocation tables
- *
- * (c) 2000 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of the mLib utilities library.
- *
- * mLib is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * mLib is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with mLib; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include "alloc.h"
-#include "assoc.h"
-#include "atom.h"
-#include "hash.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @assoc_create@ --- *
- *
- * Arguments: @assoc_table *t@ = pointer to an association table
- *
- * Returns: ---
- *
- * Use: Creates a new association table.
- */
-
-void assoc_create(assoc_table *t)
-{
- hash_create(&t->t, SYM_INITSZ);
- t->load = SYM_LIMIT(SYM_INITSZ);
-}
-
-/* --- @assoc_destroy@ --- *
- *
- * Arguments: @assoc_table *t@ = pointer to an association table
- *
- * Returns: ---
- *
- * Use: Destroys an association table.
- */
-
-void assoc_destroy(assoc_table *t)
-{
- hash_iter i;
-
- HASH_MKITER(&i, &t->t);
- for (;;) {
- hash_base *p;
- HASH_NEXT(&i, p);
- if (!p)
- break;
- x_free(t->t.a, p);
- }
- hash_destroy(&t->t);
-}
-
-/* --- @assoc_find@ --- *
- *
- * Arguments: @assoc_table *t@ = pointer to an association table
- * @atom *a@ = an atom to label the item
- * @size_t sz@ = size of block to allocate
- * @unsigned *f@ = pointer to `found' flag
- *
- * Returns: A pointer to the item located or null.
- *
- * Use: Looks up an atom in an association table. If the atom is
- * found, the association is returned. If not, and @sz@ is
- * zero, a null pointer is returned. Otherwise, a block of size
- * @sz@ is allocated, its @assoc_base@ header is filled in, and
- * the pointer returned. The flag @*f@ is cleared if the item
- * couldn't be found, or set if it was.
- *
- * All the atoms used in a particular table should
- */
-
-void *assoc_find(assoc_table *t, atom *a, size_t sz, unsigned *f)
-{
- hash_base **bin = HASH_BIN(&t->t, ATOM_HASH(a)), **p;
- assoc_base *q;
-
- /* --- Try to find the association --- */
-
- for (p = bin; *p; p = &(*p)->next) {
- q = (assoc_base *)*p;
- if (q->a == a) {
- *p = q->b.next;
- q->b.next = *bin;
- *bin = &q->b;
- if (f) *f = 1;
- return (q);
- }
- }
-
- /* --- Failed to find a match --- */
-
- if (f) *f = 0;
- if (!sz) return (0);
-
- /* --- Make a new assoication --- */
-
- q = x_alloc(t->t.a, sz);
- q->a = a;
- q->b.next = *bin;
- q->b.hash = ATOM_HASH(a);
- *bin = &q->b;
-
- /* --- Maybe extend the table --- */
-
- if (t->load)
- t->load--;
- if (!t->load && hash_extend(&t->t))
- t->load = SYM_LIMIT(t->t.mask + 1);
- return (q);
-}
-
-/* --- @assoc_remove@ --- *
- *
- * Arguments: @assoc_table *t@ = pointer to an association table
- * @void *p@ = pointer to a block to remove
- *
- * Returns: ---
- *
- * Use: Removes an association from a table.
- */
-
-void assoc_remove(assoc_table *t, void *p)
-{
- assoc_base *q = p;
- hash_remove(&t->t, &q->b);
- x_free(t->t.a, q);
- t->load++;
-}
-
-/* --- @assoc_mkiter@, @assoc_next@ --- *
- *
- * Arguments: @assoc_iter *i@ = pointer to an iterator
- * @assoc_table *t@ = pointer to an association table
- *
- * Returns: Next association, or null, for @assoc_next@; nothing for
- * @assoc_mkiter@.
- *
- * Use: Iterates over the associations in a table.
- */
-
-void assoc_mkiter(assoc_iter *i, assoc_table *t) { ASSOC_MKITER(i, t); }
-void *assoc_next(assoc_iter *i) { void *p; ASSOC_NEXT(i, p); return (p); }
-
-/*----- That's all, folks -------------------------------------------------*/