97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/* ****************************************************************************
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* iter/super.c -- super-iterator, for super-iterating.
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* Copyright (C) 2018 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libcasio.
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* libcasio is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libcasio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libcasio; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************* */
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#include "../internals.h"
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typedef struct {
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int i, len;
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casio_iter_t *its[2];
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} supercookie_t;
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/* `next_super()`: next element from the super iterator. */
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CASIO_LOCAL int next_super(supercookie_t *cookie, void **ptr)
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{
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int err;
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if (cookie->i == cookie->len)
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return (casio_error_iter);
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while (cookie->i < cookie->len - 1) {
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if ((err = casio_next(cookie->its[cookie->i], ptr))
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!= casio_error_iter)
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return (err);
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casio_end(cookie->its[cookie->i++]);
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}
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if ((err = casio_next(cookie->its[cookie->i], ptr)) != casio_error_iter)
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return (err);
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casio_end(cookie->its[cookie->i++]);
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return (casio_error_iter);
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}
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/* `end_super()`: end the super-iterator. */
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CASIO_LOCAL void end_super(supercookie_t *cookie)
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{
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int i;
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for (i = cookie->i; i < cookie->len; i++)
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casio_end(cookie->its[i]);
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free(cookie);
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}
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/* Callbacks. */
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CASIO_LOCAL casio_iter_funcs_t const super_funcs = {
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(casio_next_t *)next_super,
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NULL,
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(casio_end_t *)end_super
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};
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/**
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* casio_combine_iterator:
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* Make a super iterator.
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*
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* @arg iterp the super-iterator to create.
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* @arg first the first iterator to put into the super-iterator.
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* @arg second the second one.
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* @return the error code (0 if ok).
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*/
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int CASIO_EXPORT casio_combine_iterators(casio_iter_t **iterp,
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casio_iter_t *first, casio_iter_t *second)
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{
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supercookie_t *cookie;
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if (!(cookie = malloc(sizeof(supercookie_t)))) {
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casio_end(first);
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casio_end(second);
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return (casio_error_alloc);
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}
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cookie->len = 2;
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cookie->i = 0;
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cookie->its[0] = first;
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cookie->its[1] = second;
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return (casio_iter(iterp, cookie, &super_funcs));
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}
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