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/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* section_list
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* - data models and basic operations of section and article
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*
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* Copyright (C) 2004-2026 Leaflet <leaflet@leafok.com>
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*/
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#ifndef _SECTION_LIST_H_
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#define _SECTION_LIST_H_
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#include "bbs.h"
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#include "common.h"
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#include "menu.h"
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#include <time.h>
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#ifdef HAVE_SYSTEM_V
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#include <sys/sem.h>
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#else
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#include <semaphore.h>
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#endif
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enum section_list_constant_t
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{
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BBS_article_title_max_len = 160,
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BBS_article_limit_per_section = 50000,
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BBS_article_limit_per_page = 20,
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BBS_ontop_article_limit_per_section = 10,
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BBS_article_count_per_block = 1000,
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};
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struct article_t
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{
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int32_t aid;
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int32_t tid;
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int32_t sid;
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int32_t cid;
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int32_t uid;
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struct article_t *p_prior; // prior article
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struct article_t *p_next; // next article
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struct article_t *p_topic_prior; // same topic
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struct article_t *p_topic_next; // same topic
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int8_t visible;
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int8_t excerption;
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int8_t ontop;
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int8_t lock;
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int8_t transship;
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char username[BBS_username_max_len + 1];
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char nickname[BBS_nickname_max_len + 1];
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char title[BBS_article_title_max_len + 1];
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time_t sub_dt;
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};
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typedef struct article_t ARTICLE;
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struct section_list_t
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{
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int32_t sid;
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int32_t class_id;
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int8_t enable;
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char sname[BBS_section_name_max_len + 1];
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char stitle[BBS_section_title_max_len + 1];
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char master_list[(BBS_username_max_len + 1) * 3 + 1];
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int read_user_level;
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int write_user_level;
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int32_t article_count;
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int32_t topic_count;
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int32_t visible_article_count;
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int32_t visible_topic_count;
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ARTICLE *p_article_head;
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ARTICLE *p_article_tail;
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ARTICLE *p_page_first_article[BBS_article_limit_per_section / BBS_article_limit_per_page];
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int32_t page_count;
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int32_t last_page_visible_article_count;
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ARTICLE *p_ontop_articles[BBS_ontop_article_limit_per_section];
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int32_t ontop_article_count;
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MENU_SET ex_menu_set;
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time_t ex_menu_tm;
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};
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typedef struct section_list_t SECTION_LIST;
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struct section_list_pool_t
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{
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size_t shm_size;
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SECTION_LIST sections[BBS_max_section];
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int section_count;
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#ifndef HAVE_SYSTEM_V
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sem_t sem[BBS_max_section + 1];
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uint16_t read_lock_count[BBS_max_section + 1];
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uint16_t write_lock_count[BBS_max_section + 1];
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#else
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int semid;
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#endif
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TRIE_NODE *p_trie_dict_section_by_name;
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TRIE_NODE *p_trie_dict_section_by_sid;
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};
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typedef struct section_list_pool_t SECTION_LIST_POOL;
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extern SECTION_LIST_POOL *p_section_list_pool;
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// article_block_count * BBS_article_count_per_block should be
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// no less than BBS_article_limit_per_section * BBS_max_section,
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// in order to allocate enough memory for blocks
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extern int article_block_init(const char *filename, int block_count);
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extern void article_block_cleanup(void);
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extern int set_article_block_shm_readonly(void);
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extern int detach_article_block_shm(void);
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extern int article_block_reset(void);
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extern ARTICLE *article_block_find_by_aid(int32_t aid);
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extern ARTICLE *article_block_find_by_index(int index);
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extern int32_t article_block_last_aid(void);
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extern int article_block_article_count(void);
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extern int article_count_of_topic(int32_t aid);
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extern int section_list_init(const char *filename);
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extern void section_list_cleanup(void);
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extern int set_section_list_shm_readonly(void);
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extern int detach_section_list_shm(void);
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extern SECTION_LIST *section_list_create(int32_t sid, const char *sname, const char *stitle, const char *master_list);
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extern int section_list_update(SECTION_LIST *p_section, const char *sname, const char *stitle, const char *master_list);
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extern void section_list_reset_articles(SECTION_LIST *p_section);
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extern SECTION_LIST *section_list_find_by_name(const char *sname);
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extern SECTION_LIST *section_list_find_by_sid(int32_t sid);
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extern int get_section_index(SECTION_LIST *p_section);
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// sname could be NULL, or pointer to char[] in size >= sizeof(SECTION_LIST.sname)
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// stitle could be NULL, or pointer to char[] in size >= sizeof(SECTION_LIST.stitle)
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// master_list could be NULL, or pointer to char[] in size >= sizeof(SECTION_LIST.master_list)
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extern int get_section_info(SECTION_LIST *p_section, char *sname, char *stitle, char *master_list);
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extern int section_list_append_article(SECTION_LIST *p_section, const ARTICLE *p_article_src);
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extern int section_list_set_article_visible(SECTION_LIST *p_section, int32_t aid, int8_t visible);
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extern int section_list_set_article_excerption(SECTION_LIST *p_section, int32_t aid, int8_t excerption);
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extern int section_list_update_article_ontop(SECTION_LIST *p_section, ARTICLE *p_article);
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extern int section_list_page_count_with_ontop(SECTION_LIST *p_section);
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extern int section_list_page_article_count_with_ontop(SECTION_LIST *p_section, int32_t page_id);
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// *p_page, *p_offset will be set as page / offset of the article with aid in *p_section (including both visible and invisible articles)
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// *pp_next will be set as pointer to the next article of the article with aid
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// *pp_next will be set as head article of the section if the article with aid locates at the tail of the section
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extern ARTICLE *section_list_find_article_with_offset(SECTION_LIST *p_section, int32_t aid, int32_t *p_page, int32_t *p_offset, ARTICLE **pp_next);
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extern int section_list_calculate_page(SECTION_LIST *p_section, int32_t start_aid);
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extern int section_list_move_topic(SECTION_LIST *p_section_src, SECTION_LIST *p_section_dest, int32_t aid);
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extern int section_list_try_rd_lock(SECTION_LIST *p_section, int wait_sec);
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extern int section_list_try_rw_lock(SECTION_LIST *p_section, int wait_sec);
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extern int section_list_rd_unlock(SECTION_LIST *p_section);
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extern int section_list_rw_unlock(SECTION_LIST *p_section);
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extern int section_list_rd_lock(SECTION_LIST *p_section);
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extern int section_list_rw_lock(SECTION_LIST *p_section);
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#endif //_SECTION_LIST_H_
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