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search.c

/*
 * Copyright (c) 1997, 98, 2000, 01  
 *    Motoyuki Kasahara
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 */

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

/*
 * Page-ID macros.
 */
#define PAGE_ID_IS_LEAF_LAYER(page_id)          (((page_id) & 0x80) == 0x80)
#define PAGE_ID_IS_LAYER_START(page_id)         (((page_id) & 0x40) == 0x40)
#define PAGE_ID_IS_LAYER_END(page_id)           (((page_id) & 0x20) == 0x20)
#define PAGE_ID_HAVE_GROUP_ENTRY(page_id) (((page_id) & 0x10) == 0x10)

/*
 * The maximum number of hit entries for tomporary hit lists.
 * This is used in eb_hit_list().
 */
#define EB_TMP_MAX_HITS       64

/*
 * Book-code of the book in which you want to search a word.
 */
static EB_Book_Code cache_book_code = EB_BOOK_NONE;

/*
 * Cache buffer for the current page.
 */
static char cache_buffer[EB_SIZE_PAGE];

/*
 * Cache buffer for the current page.
 */
static int cache_page;

/*
 * Mutex for cache variables.
 */
#ifdef ENABLE_PTHREAD
static pthread_mutex_t cache_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif

/*
 * Unexported functions.
 */
static EB_Error_Code eb_hit_list_word EB_P((EB_Book *, EB_Search_Context *,
    int, EB_Hit *, int *));
static EB_Error_Code eb_hit_list_keyword EB_P((EB_Book *, EB_Search_Context *,
    int, EB_Hit *, int *));
static EB_Error_Code eb_hit_list_multi EB_P((EB_Book *, EB_Search_Context *,
    int, EB_Hit *, int *));
static void eb_and_hit_lists EB_P((EB_Hit [], int *, int, int,
    EB_Hit [][EB_TMP_MAX_HITS], int []));

/*
 * Intialize search contexts of `book'.
 */
void
eb_initialize_search_contexts(book)
    EB_Book *book;
{
    EB_Search_Context *context;
    int i;

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

    for (i = 0, context = book->search_contexts;
       i < EB_NUMBER_OF_SEARCH_CONTEXTS; i++, context++) {
      context->code = EB_SEARCH_NONE;
      context->compare_pre = NULL;
      context->compare_hit = NULL;
      context->comparison_result = -1;
      context->word[0] = '\0';
      context->canonicalized_word[0] = '\0';
      context->page = 0;
      context->offset = 0;
      context->page_id = 0;
      context->entry_count = 0;
      context->entry_index = 0;
      context->entry_length = 0;
      context->entry_arrangement = EB_ARRANGE_INVALID;
      context->in_group_entry = 0;
      context->keyword_heading.page = 0;
      context->keyword_heading.offset = 0;
    }

    LOG(("out: eb_initialize_search_context()"));
}


/*
 * Finalize search contexts of `book'.
 */
void
eb_finalize_search_contexts(book)
    EB_Book *book;
{
    LOG(("in+out: eb_finalize_search_context(book=%d)", (int)book->code));

    /* nothing to be done */
}


/*
 * Reset search context of `book'.
 */
void
eb_reset_search_contexts(book)
    EB_Book *book;
{
    LOG(("in: eb_reset_search_context(book=%d)", (int)book->code));

    eb_initialize_search_contexts(book);

    LOG(("out: eb_reset_search_context()"));
}


/*
 * Intialize a search element.
 */
void
eb_initialize_search(search)
    EB_Search *search;
{
    search->index_id = 0;
    search->start_page = 0;
    search->end_page = 0;
    search->candidates_page = 0;
    search->katakana = EB_INDEX_STYLE_CONVERT;
    search->lower = EB_INDEX_STYLE_CONVERT;
    search->mark = EB_INDEX_STYLE_DELETE;
    search->long_vowel = EB_INDEX_STYLE_CONVERT;
    search->double_consonant = EB_INDEX_STYLE_CONVERT;
    search->contracted_sound = EB_INDEX_STYLE_CONVERT;
    search->voiced_consonant = EB_INDEX_STYLE_CONVERT;
    search->small_vowel = EB_INDEX_STYLE_CONVERT;
    search->p_sound = EB_INDEX_STYLE_CONVERT;
    search->space = EB_INDEX_STYLE_DELETE;
    search->label[0] = '\0';
}


/*
 * Finalize a search element.
 */
void
eb_finalize_search(search)
    EB_Search *search;
{
    /* nothing to be done */
}


/*
 * Initialize all search elements in the current subbook.
 */
void
eb_initialize_searches(book)
    EB_Book *book;
{
    EB_Subbook *subbook;

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

    subbook = book->subbook_current;

    eb_initialize_search(&subbook->word_alphabet);
    eb_initialize_search(&subbook->word_asis);
    eb_initialize_search(&subbook->word_kana);
    eb_initialize_search(&subbook->endword_alphabet);
    eb_initialize_search(&subbook->endword_asis);
    eb_initialize_search(&subbook->endword_kana);
    eb_initialize_search(&subbook->keyword);
    eb_initialize_search(&subbook->menu);
    eb_initialize_search(&subbook->copyright);
    eb_initialize_search(&subbook->text);
    eb_initialize_search(&subbook->sound);

    LOG(("out: eb_initialize_searches(book=%d)", (int)book->code));
}


/*
 * Finalize all search elements in the current subbook.
 */
void
eb_finalize_searches(book)
    EB_Book *book;
{
    EB_Subbook *subbook;

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

    subbook = book->subbook_current;

    eb_finalize_search(&subbook->word_alphabet);
    eb_finalize_search(&subbook->word_asis);
    eb_finalize_search(&subbook->word_kana);
    eb_finalize_search(&subbook->endword_alphabet);
    eb_finalize_search(&subbook->endword_asis);
    eb_finalize_search(&subbook->endword_kana);
    eb_finalize_search(&subbook->keyword);
    eb_finalize_search(&subbook->menu);
    eb_finalize_search(&subbook->copyright);
    eb_finalize_search(&subbook->text);
    eb_finalize_search(&subbook->sound);

    LOG(("out: eb_finalize_searches()"));
}


/*
 * Pre-search for a word described in the current search context.
 * It descends intermediate indexes and reached to a leaf page that
 * may have the word.
 * If succeeded, 0 is returned.  Otherwise -1 is returned.
 */
EB_Error_Code
eb_presearch_word(book, context)
    EB_Book *book;
    EB_Search_Context *context;
{
    EB_Error_Code error_code;
    int next_page;
    int index_depth;
    char *cache_p;

    pthread_mutex_lock(&cache_mutex);
    LOG(("in: eb_presearch_word(book=%d)", (int)book->code));

    /*
     * Discard cache data.
     */
    cache_book_code = EB_BOOK_NONE;

    /*
     * Search the word in intermediate indexes.
     * Find a page number of the leaf index page.
     */
    for (index_depth = 0; index_depth < EB_MAX_INDEX_DEPTH; index_depth++) {
      next_page = context->page;

      /*
       * Seek and read a page.
       */
      if (zio_lseek(&book->subbook_current->text_zio, 
          (off_t)(context->page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
          cache_book_code = EB_BOOK_NONE;
          error_code = EB_ERR_FAIL_SEEK_TEXT;
          goto failed;
      }
      if (zio_read(&book->subbook_current->text_zio, cache_buffer,
          EB_SIZE_PAGE) != EB_SIZE_PAGE) {
          cache_book_code = EB_BOOK_NONE;
          error_code = EB_ERR_FAIL_READ_TEXT;
          goto failed;
      }

      /*
       * Get some data from the read page.
       */
      context->page_id = eb_uint1(cache_buffer);
      context->entry_length = eb_uint1(cache_buffer + 1);
      if (context->entry_length == 0)
          context->entry_arrangement = EB_ARRANGE_VARIABLE;
      else
          context->entry_arrangement = EB_ARRANGE_FIXED;
      context->entry_count = eb_uint2(cache_buffer + 2);
      context->offset = 4;
      cache_p = cache_buffer + 4;

      LOG(("aux: eb_presearch_word(page_id=0x%02x, entry_length=%d, \
entry_arrangement=%d, entry_count=%d)",
          context->page_id, context->entry_length,
          context->entry_arrangement, context->entry_count));

      /*
       * Exit the loop if it reached to the leaf index.
       */
      if (PAGE_ID_IS_LEAF_LAYER(context->page_id))
          break;

      /*
       * Search a page of next level index.
       */
      for (context->entry_index = 0;
           context->entry_index < context->entry_count;
           context->entry_index++) {
          if (EB_SIZE_PAGE < context->offset + context->entry_length + 4) {
            error_code = EB_ERR_UNEXP_TEXT;
            goto failed;
          }
          if (context->compare_pre(context->canonicalized_word, cache_p,
            (size_t)context->entry_length) <= 0) {
            next_page = eb_uint4(cache_p + context->entry_length);
            break;
          }
          cache_p += context->entry_length + 4;
          context->offset += context->entry_length + 4;
      }
      if (context->entry_count <= context->entry_index
          || context->page == next_page) {
          context->comparison_result = -1;
          goto succeeded;
      }
      context->page = next_page;
    }

    /*
     * Check for the index depth.
     */
    if (index_depth == EB_MAX_INDEX_DEPTH) {
      error_code = EB_ERR_UNEXP_TEXT;
      goto failed;
    }

    /*
     * Update search context and cache information.
     */
    context->entry_index = 0;
    context->comparison_result = 1;
    context->in_group_entry = 0;
    cache_book_code = book->code;
    cache_page = context->page;

  succeeded:
    LOG(("out: eb_presearch_word() = %s", eb_error_string(EB_SUCCESS)));
    pthread_mutex_unlock(&cache_mutex);
    return EB_SUCCESS;

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

/*
 * Get hit entries of a submitted search request.
 */
EB_Error_Code
eb_hit_list(book, max_hit_count, hit_list, hit_count)
    EB_Book *book;
    int max_hit_count;
    EB_Hit *hit_list;
    int *hit_count;
{
    EB_Error_Code error_code;
    EB_Search_Context temporary_context;
    EB_Hit temporary_hit_lists[EB_NUMBER_OF_SEARCH_CONTEXTS][EB_TMP_MAX_HITS];
    int temporary_hit_counts[EB_NUMBER_OF_SEARCH_CONTEXTS];
    int more_hit_count;
    int i;

    /*
     * Lock cache data and the book.
     */
    pthread_mutex_lock(&cache_mutex);
    eb_lock(&book->lock);
    LOG(("in: eb_hit_list(book=%d, max_hit_count=%d)", (int)book->code,
      max_hit_count));

    if (max_hit_count == 0)
      goto succeeded;

    *hit_count = 0;

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

    /*
     * Get a list of hit entries.
     */
    switch (book->search_contexts->code) {
    case EB_SEARCH_EXACTWORD:
    case EB_SEARCH_WORD:
    case EB_SEARCH_ENDWORD:
      /*
       * In case of exactword, word of endword search.
       */
      error_code = eb_hit_list_word(book, book->search_contexts,
          max_hit_count, hit_list, hit_count);
      if (error_code != EB_SUCCESS)
          goto failed;
      break;

    case EB_SEARCH_KEYWORD:
      /*
       * In case of keyword search.
       */
      for (;;) {
          int search_is_over = 0;

          for (i = 0; i < EB_MAX_KEYWORDS; i++) {
            if (book->search_contexts[i].code != EB_SEARCH_KEYWORD)
                break;
            memcpy(&temporary_context, book->search_contexts + i,
                sizeof(EB_Search_Context));
            error_code = eb_hit_list_keyword(book, &temporary_context,
                EB_TMP_MAX_HITS, temporary_hit_lists[i],
                temporary_hit_counts + i);
            if (error_code != EB_SUCCESS)
                goto failed;
            if (temporary_hit_counts[i] == 0) {
                search_is_over = 1;
                break;
            }
          }
          if (search_is_over)
            break;

          eb_and_hit_lists(hit_list + *hit_count, &more_hit_count,
            max_hit_count - *hit_count, i, temporary_hit_lists,
            temporary_hit_counts);

          for (i = 0; i < EB_MAX_MULTI_ENTRIES; i++) {
            if (book->search_contexts[i].code != EB_SEARCH_KEYWORD)
                break;
            error_code = eb_hit_list_keyword(book,
                book->search_contexts + i, temporary_hit_counts[i],
                temporary_hit_lists[i], temporary_hit_counts + i);
            if (error_code != EB_SUCCESS)
                goto failed;
          }

          *hit_count += more_hit_count;
          if (max_hit_count <= *hit_count)
            break;
      }
      break;

    case EB_SEARCH_MULTI:
      /*
       * In case of multi search.
       */
      for (;;) {
          int search_is_over = 0;

          for (i = 0; i < EB_MAX_MULTI_ENTRIES; i++) {
            if (book->search_contexts[i].code != EB_SEARCH_MULTI)
                break;
            memcpy(&temporary_context, book->search_contexts + i,
                sizeof(EB_Search_Context));
            error_code = eb_hit_list_multi(book, &temporary_context,
                EB_TMP_MAX_HITS, temporary_hit_lists[i],
                temporary_hit_counts + i);
            if (error_code != EB_SUCCESS)
                goto failed;
            if (temporary_hit_counts[i] == 0) {
                search_is_over = 1;
                break;
            }
          }
          if (search_is_over)
            break;

          eb_and_hit_lists(hit_list + *hit_count, &more_hit_count,
            max_hit_count - *hit_count, i, temporary_hit_lists,
            temporary_hit_counts);

          for (i = 0; i < EB_MAX_MULTI_ENTRIES; i++) {
            if (book->search_contexts[i].code != EB_SEARCH_MULTI)
                break;
            error_code = eb_hit_list_multi(book,
                book->search_contexts + i, temporary_hit_counts[i],
                temporary_hit_lists[i], temporary_hit_counts + i);
            if (error_code != EB_SUCCESS)
                goto failed;
          }

          *hit_count += more_hit_count;
          if (max_hit_count <= *hit_count)
            break;
      }
      break;

    default:
      /* not reached */
      error_code = EB_ERR_NO_PREV_SEARCH;
      goto failed;
    }

    /*
     * Unlock cache data and the book.
     */
  succeeded:
    LOG(("out: eb_hit_list(hit_count=%d) = %s", 
      *hit_count, eb_error_string(EB_SUCCESS)));
    eb_unlock(&book->lock);
    pthread_mutex_unlock(&cache_mutex);
    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    *hit_count = 0;
    LOG(("out: eb_hit_list() = %s", eb_error_string(error_code)));
    eb_unlock(&book->lock);
    pthread_mutex_unlock(&cache_mutex);
    return error_code;
}


/*
 * Get hit entries of a submitted exactword/word/endword search request.
 */
static EB_Error_Code
eb_hit_list_word(book, context, max_hit_count, hit_list, hit_count)
    EB_Book *book;
    EB_Search_Context *context;
    int max_hit_count;
    EB_Hit *hit_list;
    int *hit_count;
{
    EB_Error_Code error_code;
    EB_Hit *hit;
    int group_id;
    char *cache_p;

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

    hit = hit_list;
    *hit_count = 0;

    /*
     * If the result of previous comparison is negative value, all
     * matched entries have been found.
     */
    if (context->comparison_result < 0 || max_hit_count <= 0)
      goto succeeded;

    for (;;) {
      /*
       * Read a page to search, if the page is not on the cache buffer.
       *
       * Cache may be missed by the two reasons:
       *   1. the search process reaches to the end of an index page,
       *      and tries to read the next page.
       *   2. Someone else used the cache buffer.
       * 
       * At the case of 1, the search process reads the page and update
       * the search context.  At the case of 2. it reads the page but
       * must not update the context!
       */
      if (cache_book_code != book->code || cache_page != context->page) {
          if (zio_lseek(&book->subbook_current->text_zio,
            (off_t)(context->page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
            error_code = EB_ERR_FAIL_SEEK_TEXT;
            goto failed;
          }
          if (zio_read(&book->subbook_current->text_zio,
            cache_buffer, EB_SIZE_PAGE) != EB_SIZE_PAGE) {
            error_code = EB_ERR_FAIL_READ_TEXT;
            goto failed;
          }

          /*
           * Update search context.
           */
          if (context->entry_index == 0) {
            context->page_id = eb_uint1(cache_buffer);
            context->entry_length = eb_uint1(cache_buffer + 1);
            if (context->entry_length == 0)
                context->entry_arrangement = EB_ARRANGE_VARIABLE;
            else
                context->entry_arrangement = EB_ARRANGE_FIXED;
            context->entry_count = eb_uint2(cache_buffer + 2);
            context->entry_index = 0;
            context->offset = 4;
          }

          cache_book_code = book->code;
          cache_page = context->page;
      }

      cache_p = cache_buffer + context->offset;

      LOG(("aux: eb_hit_list_word(page_id=0x%02x, entry_length=%d, \
entry_arrangement=%d, entry_count=%d)",
          context->page_id, context->entry_length,
          context->entry_arrangement, context->entry_count));

      if (!PAGE_ID_IS_LEAF_LAYER(context->page_id)) {
          /*
           * Not a leaf index.  It is an error.
           */
          error_code = EB_ERR_UNEXP_TEXT;
          goto failed;
      }

      if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
          && context->entry_arrangement == EB_ARRANGE_FIXED) {
          /*
           * The leaf index doesn't have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE
                < context->offset + context->entry_length + 12) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            /*
             * Compare word and pattern.
             * If matched, add it to a hit list.
             */
            context->comparison_result
                = context->compare_hit(context->word, cache_p,
                  (size_t)context->entry_length);
            if (context->comparison_result == 0) {
                hit->heading.page
                  = eb_uint4(cache_p + context->entry_length + 6);
                hit->heading.offset
                  = eb_uint2(cache_p + context->entry_length + 10);
                hit->text.page
                  = eb_uint4(cache_p + context->entry_length);
                hit->text.offset
                  = eb_uint2(cache_p + context->entry_length + 4);
                hit++;
                *hit_count += 1;
            }
            context->entry_index++;
            context->offset += context->entry_length + 12;
            cache_p += context->entry_length + 12;

            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }

      } else if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
          && context->entry_arrangement == EB_ARRANGE_VARIABLE) {

          /*
           * The leaf index doesn't have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE < context->offset + 1) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }
            context->entry_length = eb_uint1(cache_p);
            if (EB_SIZE_PAGE
                < context->offset + context->entry_length + 13) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            /*
             * Compare word and pattern.
             * If matched, add it to a hit list.
             */
            context->comparison_result
                = context->compare_hit(context->word, cache_p + 1,
                  (size_t)context->entry_length);
            if (context->comparison_result == 0) {
                hit->heading.page
                  = eb_uint4(cache_p + context->entry_length + 7);
                hit->heading.offset
                  = eb_uint2(cache_p + context->entry_length + 11);
                hit->text.page
                  = eb_uint4(cache_p + context->entry_length + 1);
                hit->text.offset
                  = eb_uint2(cache_p + context->entry_length + 5);
                hit++;
                *hit_count += 1;
            }
            context->entry_index++;
            context->offset += context->entry_length + 13;
            cache_p += context->entry_length + 13;

            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }

      } else {
          /*
           * The leaf index have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE < context->offset + 2) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }
            group_id = eb_uint1(cache_p);

            if (group_id == 0x00) {
                /*
                 * 0x00 -- Single entry.
                 */
                context->entry_length = eb_uint1(cache_p + 1);
                if (EB_SIZE_PAGE
                  < context->offset + context->entry_length + 14) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }

                /*
                 * Compare word and pattern.
                 * If matched, add it to a hit list.
                 */
                context->comparison_result
                  = context->compare_hit(context->canonicalized_word,
                      cache_p + 2, (size_t)context->entry_length);
                if (context->comparison_result == 0
                  && context->compare_hit(context->word, cache_p + 2,
                      (size_t)context->entry_length) == 0) {
                  hit->heading.page
                      = eb_uint4(cache_p + context->entry_length + 8);
                  hit->heading.offset
                      = eb_uint2(cache_p + context->entry_length + 12);
                  hit->text.page
                      = eb_uint4(cache_p + context->entry_length + 2);
                  hit->text.offset
                      = eb_uint2(cache_p + context->entry_length + 6);
                  hit++;
                  *hit_count += 1;
                }
                context->in_group_entry = 0;
                context->offset += context->entry_length + 14;
                cache_p += context->entry_length + 14;

            } else if (group_id == 0x80) {
                /*
                 * 0x80 -- Start of group entry.
                 */
                context->entry_length = eb_uint1(cache_p + 1);
                if (EB_SIZE_PAGE
                  < context->offset + context->entry_length + 4) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }
                context->comparison_result
                  = context->compare_hit(context->canonicalized_word,
                      cache_p + 4, (size_t)context->entry_length);
                context->in_group_entry = 1;
                cache_p += context->entry_length + 4;
                context->offset += context->entry_length + 4;

            } else if (group_id == 0xc0) {
                /*
                 * Element of the group entry
                 */
                context->entry_length = eb_uint1(cache_p + 1);
                if (EB_SIZE_PAGE < context->offset + 14) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }

                /*
                 * Compare word and pattern.
                 * If matched, add it to a hit list.
                 */
                if (context->comparison_result == 0
                  && context->in_group_entry
                  && context->compare_hit(context->word, cache_p + 2,
                      (size_t)context->entry_length) == 0) {
                  hit->heading.page
                      = eb_uint4(cache_p + context->entry_length + 8);
                  hit->heading.offset
                      = eb_uint2(cache_p + context->entry_length + 12);
                  hit->text.page
                      = eb_uint4(cache_p + context->entry_length + 2);
                  hit->text.offset
                      = eb_uint2(cache_p + context->entry_length + 6);
                  hit++;
                  *hit_count += 1;
                }
                context->offset += context->entry_length + 14;
                cache_p += context->entry_length + 14;

            } else {
                /*
                 * Unknown group ID.
                 */
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            context->entry_index++;
            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }
      }

      /*
       * Go to a next page if available.
       */
      if (PAGE_ID_IS_LAYER_END(context->page_id)) {
          context->comparison_result = -1;
          goto succeeded;
      }
      context->page++;
      context->entry_index = 0;
    }

  succeeded:
    LOG(("out: eb_hit_list_word(hit_count=%d) = %s",
      *hit_count, eb_error_string(EB_SUCCESS)));
    return EB_SUCCESS;

    /*
     * An error occurs...
     * Discard cache if read error occurs.
     */
  failed:
    if (error_code == EB_ERR_FAIL_READ_TEXT)
      cache_book_code = EB_BOOK_NONE;
    *hit_count = 0;
    LOG(("out: eb_hit_list_word() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Get hit entries of a submitted keyword search request.
 */
static EB_Error_Code
eb_hit_list_keyword(book, context, max_hit_count, hit_list, hit_count)
    EB_Book *book;
    EB_Search_Context *context;
    int max_hit_count;
    EB_Hit *hit_list;
    int *hit_count;
{
    EB_Error_Code error_code;
    EB_Text_Context text_context;
    EB_Hit *hit;
    int group_id;
    char *cache_p;

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

    hit = hit_list;
    *hit_count = 0;

    /*
     * Backup the text context in `book'.
     */
    memcpy(&text_context, &book->text_context, sizeof(EB_Text_Context));

    /*
     * Seek text file.
     */
    if (context->in_group_entry && context->comparison_result == 0) {
      error_code = eb_seek_text(book, &context->keyword_heading);
      if (error_code != EB_SUCCESS)
          goto failed;
    }

    /*
     * If the result of previous comparison is negative value, all
     * matched entries have been found.
     */
    if (context->comparison_result < 0 || max_hit_count <= 0)
      goto succeeded;

    for (;;) {
      /*
       * Read a page to search, if the page is not on the cache buffer.
       *
       * Cache may be missed by the two reasons:
       *   1. the search process reaches to the end of an index page,
       *      and tries to read the next page.
       *   2. Someone else used the cache buffer.
       * 
       * At the case of 1, the search process reads the page and update
       * the search context.  At the case of 2. it reads the page but
       * must not update the context!
       */
      if (cache_book_code != book->code || cache_page != context->page) {
          if (zio_lseek(&book->subbook_current->text_zio,
            (off_t)(context->page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
            error_code = EB_ERR_FAIL_SEEK_TEXT;
            goto failed;
          }
          if (zio_read(&book->subbook_current->text_zio, cache_buffer,
            EB_SIZE_PAGE) != EB_SIZE_PAGE) {
            error_code = EB_ERR_FAIL_READ_TEXT;
            goto failed;
          }

          /*
           * Update search context.
           */
          if (context->entry_index == 0) {
            context->page_id = eb_uint1(cache_buffer);
            context->entry_length = eb_uint1(cache_buffer + 1);
            if (context->entry_length == 0)
                context->entry_arrangement = EB_ARRANGE_VARIABLE;
            else
                context->entry_arrangement = EB_ARRANGE_FIXED;
            context->entry_count = eb_uint2(cache_buffer + 2);
            context->entry_index = 0;
            context->offset = 4;
          }

          cache_book_code = book->code;
          cache_page = context->page;
      }

      cache_p = cache_buffer + context->offset;

      LOG(("aux: eb_hit_list_keyword(page_id=0x%02x, entry_length=%d, \
entry_arrangement=%d, entry_count=%d)",
          context->page_id, context->entry_length,
          context->entry_arrangement, context->entry_count));

      if (!PAGE_ID_IS_LEAF_LAYER(context->page_id)) {
          /*
           * Not a leaf index.  It is an error.
           */
          error_code = EB_ERR_UNEXP_TEXT;
          goto failed;
      }

      if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
          && context->entry_arrangement == EB_ARRANGE_FIXED) {
          /*
           * The leaf index doesn't have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE
                < context->offset + context->entry_length + 12) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            /*
             * Compare word and pattern.
             * If matched, add it to a hit list.
             */
            context->comparison_result
                = context->compare_hit(context->word, cache_p,
                  (size_t)context->entry_length);
            if (context->comparison_result == 0) {
                hit->heading.page
                  = eb_uint4(cache_p + context->entry_length + 6);
                hit->heading.offset
                  = eb_uint2(cache_p + context->entry_length + 10);
                hit->text.page
                  = eb_uint4(cache_p + context->entry_length);
                hit->text.offset
                  = eb_uint2(cache_p + context->entry_length + 4);
                hit++;
                *hit_count += 1;
            }
            context->entry_index++;
            context->offset += context->entry_length + 12;
            cache_p += context->entry_length + 12;

            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }

      } else if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
          && context->entry_arrangement == EB_ARRANGE_VARIABLE) {
          /*
           * The leaf index doesn't have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE < context->offset + 1) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }
            context->entry_length = eb_uint1(cache_p);
            if (EB_SIZE_PAGE
                < context->offset + context->entry_length + 13) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            /*
             * Compare word and pattern.
             * If matched, add it to a hit list.
             */
            context->comparison_result
                = context->compare_hit(context->word, cache_p + 1,
                  (size_t)context->entry_length);
            if (context->comparison_result == 0) {
                hit->heading.page
                  = eb_uint4(cache_p + context->entry_length + 7);
                hit->heading.offset
                  = eb_uint2(cache_p + context->entry_length + 11);
                hit->text.page
                  = eb_uint4(cache_p + context->entry_length + 1);
                hit->text.offset
                  = eb_uint2(cache_p + context->entry_length + 5);
                hit++;
                *hit_count += 1;
            }
            context->entry_index++;
            context->offset += context->entry_length + 13;
            cache_p += context->entry_length + 13;

            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }

      } else {
          /*
           * The leaf index have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE < context->offset + 2) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }
            group_id = eb_uint1(cache_p);

            if (group_id == 0x00) {
                /*
                 * 0x00 -- Single entry.
                 */
                context->entry_length = eb_uint1(cache_p + 1);
                if (EB_SIZE_PAGE
                  < context->offset + context->entry_length + 14) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }

                /*
                 * Compare word and pattern.
                 * If matched, add it to a hit list.
                 */
                context->comparison_result
                  = context->compare_hit(context->canonicalized_word,
                      cache_p + 2, (size_t)context->entry_length);
                if (context->comparison_result == 0
                  && context->compare_hit(context->word, cache_p + 2,
                      (size_t)context->entry_length) == 0) {
                  hit->heading.page
                      = eb_uint4(cache_p + context->entry_length + 8);
                  hit->heading.offset
                      = eb_uint2(cache_p + context->entry_length + 12);
                  hit->text.page
                      = eb_uint4(cache_p + context->entry_length + 2);
                  hit->text.offset
                      = eb_uint2(cache_p + context->entry_length + 6);
                  hit++;
                  *hit_count += 1;
                }
                context->in_group_entry = 0;
                context->offset += context->entry_length + 14;
                cache_p += context->entry_length + 14;

            } else if (group_id == 0x80) {
                /*
                 * 0x80 -- Start of group entry.
                 */
                context->entry_length = eb_uint1(cache_p + 1);
                if (EB_SIZE_PAGE
                  < context->offset + context->entry_length + 12) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }
                context->comparison_result
                  = context->compare_hit(context->word, cache_p + 6,
                      (size_t)context->entry_length);
                context->keyword_heading.page
                  = eb_uint4(cache_p + context->entry_length + 6);
                context->keyword_heading.offset
                  = eb_uint2(cache_p + context->entry_length + 10);
                context->in_group_entry = 1;
                cache_p += context->entry_length + 12;
                context->offset += context->entry_length + 12;

                if (context->comparison_result == 0) {
                  error_code
                      = eb_seek_text(book, &context->keyword_heading);
                  if (error_code != EB_SUCCESS)
                      goto failed;
                }

            } else if (group_id == 0xc0) {
                /*
                 * Element of the group entry.
                 */
                if (EB_SIZE_PAGE < context->offset + 7) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }

                /*
                 * Compare word and pattern.
                 * If matched, add it to a hit list.
                 */
                if (context->in_group_entry
                  && context->comparison_result == 0) {
                  error_code
                      = eb_tell_text(book, &context->keyword_heading);
                  if (error_code != EB_SUCCESS)
                      goto failed;
                  hit->heading.page   = context->keyword_heading.page;
                  hit->heading.offset = context->keyword_heading.offset;
                  hit->text.page      = eb_uint4(cache_p + 1);
                  hit->text.offset    = eb_uint2(cache_p + 5);
                  hit++;
                  *hit_count += 1;
                  error_code = eb_forward_heading(book);
                  if (error_code != EB_SUCCESS)
                      goto failed;
                }
                context->offset += 7;
                cache_p += 7;
                
            } else {
                /*
                 * Unknown group ID.
                 */
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            context->entry_index++;
            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }
      }

      /*
       * Go to a next page if available.
       */
      if (PAGE_ID_IS_LAYER_END(context->page_id)) {
          context->comparison_result = -1;
          goto succeeded;
      }
      context->page++;
      context->entry_index = 0;
    }

  succeeded:
    if (context->in_group_entry && context->comparison_result == 0) {
      error_code = eb_tell_text(book, &context->keyword_heading);
      if (error_code != EB_SUCCESS)
          goto failed;
    }

    /*
     * Restore the text context in `book'.
     */
    memcpy(&book->text_context, &text_context, sizeof(EB_Text_Context));
    LOG(("out: eb_hit_list_keyword(hit_count=%d) = %s",
      *hit_count, eb_error_string(EB_SUCCESS)));
    return EB_SUCCESS;

    /*
     * An error occurs...
     * Discard cache if read error occurs.
     */
  failed:
    if (error_code == EB_ERR_FAIL_READ_TEXT)
      cache_book_code = EB_BOOK_NONE;
    *hit_count = 0;
    memcpy(&book->text_context, &text_context, sizeof(EB_Text_Context));
    LOG(("out: eb_hit_list_keyword() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Get hit entries of a submitted multi search request.
 */
static EB_Error_Code
eb_hit_list_multi(book, context, max_hit_count, hit_list, hit_count)
    EB_Book *book;
    EB_Search_Context *context;
    int max_hit_count;
    EB_Hit *hit_list;
    int *hit_count;
{
    EB_Error_Code error_code;
    EB_Hit *hit;
    int group_id;
    char *cache_p;

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

    hit = hit_list;
    *hit_count = 0;

    /*
     * If the result of previous comparison is negative value, all
     * matched entries have been found.
     */
    if (context->comparison_result < 0 || max_hit_count <= 0)
      goto succeeded;

    for (;;) {
      /*
       * Read a page to search, if the page is not on the cache buffer.
       *
       * Cache may be missed by the two reasons:
       *   1. the search process reaches to the end of an index page,
       *      and tries to read the next page.
       *   2. Someone else used the cache buffer.
       * 
       * At the case of 1, the search process reads the page and update
       * the search context.  At the case of 2. it reads the page but
       * must not update the context!
       */
      if (cache_book_code != book->code || cache_page != context->page) {
          if (zio_lseek(&book->subbook_current->text_zio,
            (off_t)(context->page - 1) * EB_SIZE_PAGE, SEEK_SET) < 0) {
            error_code = EB_ERR_FAIL_SEEK_TEXT;
            goto failed;
          }
          if (zio_read(&book->subbook_current->text_zio, cache_buffer,
            EB_SIZE_PAGE) != EB_SIZE_PAGE) {
            error_code = EB_ERR_FAIL_READ_TEXT;
            goto failed;
          }

          /*
           * Update search context.
           */
          if (context->entry_index == 0) {
            context->page_id = eb_uint1(cache_buffer);
            context->entry_length = eb_uint1(cache_buffer + 1);
            if (context->entry_length == 0)
                context->entry_arrangement = EB_ARRANGE_VARIABLE;
            else
                context->entry_arrangement = EB_ARRANGE_FIXED;
            context->entry_count = eb_uint2(cache_buffer + 2);
            context->entry_index = 0;
            context->offset = 4;
          }

          cache_book_code = book->code;
          cache_page = context->page;
      }

      cache_p = cache_buffer + context->offset;

      LOG(("aux: eb_hit_list_multi(page_id=0x%02x, entry_length=%d, \
entry_arrangement=%d, entry_count=%d)",
          context->page_id, context->entry_length,
          context->entry_arrangement, context->entry_count));

      if (!PAGE_ID_IS_LEAF_LAYER(context->page_id)) {
          /*
           * Not a leaf index.  It is an error.
           */
          error_code = EB_ERR_UNEXP_TEXT;
          goto failed;
      }

      if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
          && context->entry_arrangement == EB_ARRANGE_FIXED) {
          /*
           * The leaf index doesn't have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE
                < context->offset + context->entry_length + 13) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            /*
             * Compare word and pattern.
             * If matched, add it to a hit list.
             */
            context->comparison_result
                = context->compare_hit(context->word, cache_p,
                  (size_t)context->entry_length);
            if (context->comparison_result == 0) {
                hit->heading.page
                  = eb_uint4(cache_p + context->entry_length + 6);
                hit->heading.offset
                  = eb_uint2(cache_p + context->entry_length + 10);
                hit->text.page
                  = eb_uint4(cache_p + context->entry_length);
                hit->text.offset
                  = eb_uint2(cache_p + context->entry_length + 4);
                hit++;
                *hit_count += 1;
            }
            context->entry_index++;
            context->offset += context->entry_length + 12;
            cache_p += context->entry_length + 12;

            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }

      } else if (!PAGE_ID_HAVE_GROUP_ENTRY(context->page_id)
          && context->entry_arrangement == EB_ARRANGE_VARIABLE) {
          /*
           * The leaf index doesn't have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE < context->offset + 1) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }
            context->entry_length = eb_uint1(cache_p);
            if (EB_SIZE_PAGE
                < context->offset + context->entry_length + 13) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            /*
             * Compare word and pattern.
             * If matched, add it to a hit list.
             */
            context->comparison_result
                = context->compare_hit(context->word, cache_p + 1,
                  (size_t)context->entry_length);
            if (context->comparison_result == 0) {
                hit->heading.page
                  = eb_uint4(cache_p + context->entry_length + 7);
                hit->heading.offset
                  = eb_uint2(cache_p + context->entry_length + 11);
                hit->text.page
                  = eb_uint4(cache_p + context->entry_length + 1);
                hit->text.offset
                  = eb_uint2(cache_p + context->entry_length + 5);
                hit++;
                *hit_count += 1;
            }
            context->entry_index++;
            context->offset += context->entry_length + 13;
            cache_p += context->entry_length + 13;

            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }

      } else {
          /*
           * The leaf index have a group entry.
           * Find text and heading locations.
           */
          while (context->entry_index < context->entry_count) {
            if (EB_SIZE_PAGE < context->offset + 2) {
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }
            group_id = eb_uint1(cache_p);

            if (group_id == 0x00) {
                /*
                 * 0x00 -- Single entry.
                 */
                context->entry_length = eb_uint1(cache_p + 1);
                if (EB_SIZE_PAGE
                  < context->offset + context->entry_length + 14) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }

                /*
                 * Compare word and pattern.
                 * If matched, add it to a hit list.
                 */
                context->comparison_result
                  = context->compare_hit(context->canonicalized_word,
                      cache_p + 2, (size_t)context->entry_length);
                if (context->comparison_result == 0
                  && context->compare_hit(context->word, cache_p + 2,
                      (size_t)context->entry_length) == 0) {
                  hit->heading.page
                      = eb_uint4(cache_p + context->entry_length + 8);
                  hit->heading.offset
                      = eb_uint2(cache_p + context->entry_length + 12);
                  hit->text.page
                      = eb_uint4(cache_p + context->entry_length + 2);
                  hit->text.offset
                      = eb_uint2(cache_p + context->entry_length + 6);
                  hit++;
                  *hit_count += 1;
                }
                context->in_group_entry = 0;
                context->offset += context->entry_length + 14;
                cache_p += context->entry_length + 14;

            } else if (group_id == 0x80) {
                /*
                 * 0x80 -- Start of group entry.
                 */
                context->entry_length = eb_uint1(cache_p + 1);
                if (EB_SIZE_PAGE
                  < context->offset + context->entry_length + 6) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }
                context->comparison_result
                  = context->compare_hit(context->word,
                      cache_p + 6, (size_t)context->entry_length);
                context->in_group_entry = 1;
                cache_p += context->entry_length + 6;
                context->offset += context->entry_length + 6;

            } else if (group_id == 0xc0) {
                /*
                 * Element of the group entry.
                 */
                if (EB_SIZE_PAGE < context->offset + 13) {
                  error_code = EB_ERR_UNEXP_TEXT;
                  goto failed;
                }

                /*
                 * Compare word and pattern.
                 * If matched, add it to a hit list.
                 */
                if (context->in_group_entry
                  && context->comparison_result == 0) {
                  hit->heading.page   = eb_uint4(cache_p + 7);
                  hit->heading.offset = eb_uint2(cache_p + 11);
                  hit->text.page      = eb_uint4(cache_p + 1);
                  hit->text.offset    = eb_uint2(cache_p + 5);
                  hit++;
                  *hit_count += 1;
                }
                context->offset += 13;
                cache_p += 13;
                
            } else {
                /*
                 * Unknown group ID.
                 */
                error_code = EB_ERR_UNEXP_TEXT;
                goto failed;
            }

            context->entry_index++;
            if (context->comparison_result < 0
                || max_hit_count <= *hit_count)
                goto succeeded;
          }
      }

      /*
       * Go to a next page if available.
       */
      if (PAGE_ID_IS_LAYER_END(context->page_id)) {
          context->comparison_result = -1;
          goto succeeded;
      }
      context->page++;
      context->entry_index = 0;
    }

  succeeded:
    LOG(("out: eb_hit_list_multi(hit_count=%d) = %s",
      *hit_count, eb_error_string(EB_SUCCESS)));
    return EB_SUCCESS;

    /*
     * An error occurs...
     * Discard cache if read error occurs.
     */
  failed:
    if (error_code == EB_ERR_FAIL_READ_TEXT)
      cache_book_code = EB_BOOK_NONE;
    *hit_count = 0;
    LOG(("out: eb_hit_list_multi() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Do AND operation of hit lists.
 * and_list = hit_lists[0] AND hit_lists[1] AND ...
 */
static void
eb_and_hit_lists(and_list, and_count, max_and_count, hit_list_count,
    hit_lists, hit_counts)
    EB_Hit and_list[EB_TMP_MAX_HITS];
    int *and_count;
    int max_and_count;
    int hit_list_count;
    EB_Hit hit_lists[EB_NUMBER_OF_SEARCH_CONTEXTS][EB_TMP_MAX_HITS];
    int hit_counts[EB_NUMBER_OF_SEARCH_CONTEXTS];
{
    int hit_indexes[EB_NUMBER_OF_SEARCH_CONTEXTS];
    int greatest_list;
    int greatest_page;
    int greatest_offset;
    int current_page;
    int current_offset;
    int equal_count;
    int increment_count;
    int i;

    LOG(("in: eb_and_hit_lists(max_and_count=%d, hit_list_count=%d)", 
      max_and_count, hit_list_count));

    /*
     * Initialize indexes for the hit_lists[].
     */
    for (i = 0; i < hit_list_count; i++)
      hit_indexes[i] = 0;

    /*
     * Generate the new list `and_list'.
     */
    *and_count = 0;
    while (*and_count < max_and_count) {
      /*
       * Initialize variables.
       */
      greatest_list = -1;
      greatest_page = 0;
      greatest_offset = 0;
      current_page = 0;
      current_offset = 0;
      equal_count = 0;

      /*
       * Compare the current elements of the lists.
       */
      for (i = 0; i < hit_list_count; i++) {
          /*
           * If we have been reached to the tail of the hit_lists[i],
           * skip the list.
           */
          if (hit_counts[i] <= hit_indexes[i])
            continue;

          /*
           * Compare {current_page, current_offset} and {greatest_page,
           * greatest_offset}.
           */
          current_page = hit_lists[i][hit_indexes[i]].text.page;
          current_offset = hit_lists[i][hit_indexes[i]].text.offset;

          if (greatest_list == -1) {
            greatest_page = current_page;
            greatest_offset = current_offset;
            greatest_list = i;
            equal_count++;
          } else if (greatest_page < current_page) {
            greatest_page = current_page;
            greatest_offset = current_offset;
            greatest_list = i;
          } else if (current_page == greatest_page
            && greatest_offset < current_offset) {
            greatest_page = current_page;
            greatest_offset = current_offset;
            greatest_list = i;
          } else if (current_page == greatest_page
            && current_offset == greatest_offset) {
            equal_count++;
          }
      }

      if (equal_count == hit_list_count) {
          /*
           * All the current elements of the lists point to the same
           * position.  This is hit element.  Increase indexes of all
           * lists.
           */
          memcpy(and_list + *and_count, hit_lists[0] + hit_indexes[0],
            sizeof(EB_Hit));
          *and_count += 1;
          for (i = 0; i < hit_list_count; i++) {
            if (hit_counts[i] <= hit_indexes[i])
                continue;
            hit_indexes[i]++;
          }
      } else {
          /*
           * This is not hit element.  Increase indexes of all lists
           * except for greatest element(s).  If there is no list
           * whose index is incremented, our job has been completed.
           */
          increment_count = 0;
          for (i = 0; i < hit_list_count; i++) {
            if (hit_counts[i] <= hit_indexes[i])
                continue;
            current_page = hit_lists[i][hit_indexes[i]].text.page;
            current_offset = hit_lists[i][hit_indexes[i]].text.offset;
            if (current_page != greatest_page
                || current_offset != greatest_offset) {
                hit_indexes[i]++;
                increment_count++;
            }
          }
          if (increment_count == 0)
            break;
      }
    }

    /*
     * Update hit_counts[].
     * The hit counts of the lists are set to the current indexes.
     */
    for (i = 0; i < hit_list_count; i++)
      hit_counts[i] = hit_indexes[i];

    LOG(("out: eb_and_hit_lists(and_count=%d)", and_count));
}

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