| 1 | /* |
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| 2 | * |
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| 3 | * Copyright (C) 1989 by the Massachusetts Institute of Technology |
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| 4 | * Developed by the MIT Student Information Processing Board (SIPB). |
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| 5 | * For copying information, see the file mit-copyright.h in this release. |
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| 6 | * |
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| 7 | */ |
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| 8 | |
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| 9 | /* |
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| 10 | * edsc.h --- include file for the emacs discuss back-end program |
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| 11 | */ |
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| 12 | |
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| 13 | #include <discuss/discuss.h> |
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| 14 | #include <errno.h> |
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| 15 | #include <stdlib.h> |
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| 16 | |
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| 17 | extern char *user_id; |
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| 18 | extern tfile stdout_tf; |
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| 19 | extern int bit_bucket(); |
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| 20 | extern char *do_quote(); |
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| 21 | tfile unix_tfile(); |
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| 22 | extern int cache_activated, cache_working; |
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| 23 | extern int use_vectors; |
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| 24 | |
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| 25 | extern int do_quit(), do_gmi(), do_gti(), do_gcm(), do_gml(), do_gt(); |
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| 26 | extern int do_gtf(), do_grt(), do_grtn(), do_ss(), do_at(), do_nut(); |
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| 27 | extern int do_sfl(), do_am(), do_dm(), do_gpv(); |
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| 28 | extern int do_pacl(), do_sacl(), do_dacl(); |
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| 29 | extern int do_dt(), do_rt(), do_ls(); |
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| 30 | |
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| 31 | extern char *short_time(); |
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| 32 | |
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| 33 | /* selection flags */ |
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| 34 | #define flag_AREF 8 |
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| 35 | |
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| 36 | /* filtering flags */ |
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| 37 | #define filter_INCLUDE_DELETED 1 |
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| 38 | #define filter_ONLY_DELETED 2 |
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| 39 | #define filter_ONLY_INITIAL 4 |
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| 40 | #define filter_ONLY_TERMINAL 16 |
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| 41 | #define filter_FLAG_SET 32 |
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| 42 | #define filter_FLAG_RESET 64 |
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| 43 | |
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| 44 | /* |
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| 45 | * Here is the cache information..... |
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| 46 | */ |
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| 47 | |
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| 48 | /* |
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| 49 | * The caching is only enabled if EDSC_CACHE is defined.... |
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| 50 | */ |
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| 51 | #define EDSC_CACHE |
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| 52 | |
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| 53 | #ifdef EDSC_CACHE |
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| 54 | #define CACHE_DIR "/tmp" |
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| 55 | #define CACHE_FN_SIZE 80 |
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| 56 | #define CACHE_STRATEGY_SIZE 256 |
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| 57 | #define CACHE_DEFAULT_SIZE 50 |
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| 58 | |
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| 59 | #define CACHE_FLG_INFO 1 |
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| 60 | #define CACHE_FLG_TEXT 2 |
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| 61 | |
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| 62 | struct cache_meeting { |
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| 63 | int ref_count; |
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| 64 | name_blk nb; |
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| 65 | mtg_info m_info; |
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| 66 | int meeting_code; /* Error code when fetching */ |
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| 67 | /* meeting info */ |
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| 68 | struct cache_meeting *next; |
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| 69 | struct cache_meeting *prev; |
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| 70 | }; |
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| 71 | |
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| 72 | struct cache_info { |
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| 73 | trn_nums trn_num; |
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| 74 | struct cache_meeting *meeting; |
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| 75 | int flags; |
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| 76 | char filename[CACHE_FN_SIZE]; |
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| 77 | trn_info3 t_info; |
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| 78 | int info_code; /* Error code when fetching info */ |
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| 79 | int text_code; /* Error code when fetch the text */ |
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| 80 | struct cache_info *next; /* Used to keep LRU list */ |
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| 81 | /* Also used for empty list */ |
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| 82 | struct cache_info *prev; |
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| 83 | }; |
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| 84 | |
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| 85 | /* |
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| 86 | * The cache work instructions are divided into two fields: |
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| 87 | * |
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| 88 | * The upper 4 bits define the opcode, the lower 4 bites define the |
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| 89 | * direction, if any. |
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| 90 | * |
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| 91 | * OPCODES: |
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| 92 | * STOP --- Stop doing any cache work. |
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| 93 | * GET_CUR --- Get the current transaction |
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| 94 | * FETCH_CUR --- Fetch the article one away in the indicated direction |
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| 95 | * from the current article. |
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| 96 | * SET_PTR --- Set the pointer to the current article |
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| 97 | * MFETCH_PTR --- Move the pointer one in the indicated direction and |
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| 98 | * fetch that article |
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| 99 | */ |
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| 100 | |
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| 101 | typedef char cache_dir; |
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| 102 | |
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| 103 | #define CACHE_OP_MASK 0xF0 |
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| 104 | #define CACHE_OP_STOP (0 << 4) |
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| 105 | #define CACHE_OP_GET_CUR (1 << 4) |
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| 106 | #define CACHE_OP_FETCH_CUR (2 << 4) |
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| 107 | #define CACHE_OP_SET_PTR (3 << 4) |
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| 108 | #define CACHE_OP_MFETCH_PTR (4 << 4) |
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| 109 | |
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| 110 | #define CACHE_DIR_MASK 0x0F |
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| 111 | #define CACHE_DIR_CURRENT 0 |
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| 112 | #define CACHE_DIR_NEXT 1 |
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| 113 | #define CACHE_DIR_PREV 2 |
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| 114 | #define CACHE_DIR_NREF 3 |
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| 115 | #define CACHE_DIR_PREF 4 |
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| 116 | #define CACHE_DIR_FREF 5 |
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| 117 | #define CACHE_DIR_LREF 6 |
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| 118 | |
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| 119 | |
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| 120 | /* |
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| 121 | * Function declarations |
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| 122 | */ |
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| 123 | |
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| 124 | struct cache_info *cache_empty(), *cache_search(); |
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| 125 | struct cache_meeting *get_cache_meeting(), *search_cache_meetings(); |
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| 126 | |
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| 127 | void cache_get_transaction_text(), cache_flush(), free_cache_entry(); |
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| 128 | void free_cache_meeting(), do_cache_work(), cache_init(); |
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| 129 | |
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| 130 | extern int do_scd(), do_gtfc(), do_it(), do_itn(), do_im(); |
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| 131 | extern int cache_pc; |
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| 132 | extern struct cache_info *cache_current; |
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| 133 | extern cache_dir cache_current_direction; |
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| 134 | |
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| 135 | |
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| 136 | #endif /* EDSC_CACHE */ |
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| 137 | |
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