zero-epwing-go/text.c

/*
 * Copyright (c) 1997-2006  Motoyuki Kasahara
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "build-pre.h"
#include "eb.h"
#include "error.h"
#include "build-post.h"

/*
 * Examine whether the current subbook in `book' has text body.
 * or not.
 */
int
eb_have_text(EB_Book *book)
{
    LOG(("in: eb_have_text(book=%d)", (int)book->code));

    /*
     * Current subbook must have been set.
     */
    if (book->subbook_current == NULL)
    goto failed;

    /*
     * Check for the index page of text.
     */
    if (book->subbook_current->text.start_page == 0)
    goto failed;

    LOG(("out: eb_have_text() = %d", 1));

    return 1;

    /*
     * An error occurs...
     */
  failed:
    LOG(("out: eb_have_text() = %d", 0));
    return 0;
}


/*
 * Menu.
 */
EB_Error_Code
eb_text(EB_Book *book, EB_Position *position)
{
    EB_Error_Code error_code;
    int page;

    LOG(("in: eb_text(book=%d)", (int)book->code));

    /*
     * Current subbook must have been set.
     */
    if (book->subbook_current == NULL) {
    error_code = EB_ERR_NO_CUR_SUB;
    goto failed;
    }

    /*
     * Check for the page number of text.
     */
    page = book->subbook_current->text.start_page;
    if (page == 0) {
    error_code = EB_ERR_NO_SUCH_SEARCH;
    goto failed;
    }

    /*
     * Copy the position to `position'.
     */
    position->page = page;
    position->offset = 0;

    LOG(("out: eb_text(position={%d,%d}) = %s",
    position->page, position->offset, eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    LOG(("out: eb_text() = %s", eb_error_string(error_code)));
    return error_code;
}