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- /* nodes.h -- How we represent nodes internally. */
-
- /* This file is part of GNU Info, a program for reading online documentation
- stored in Info format.
-
- Copyright (C) 1993 Free Software Foundation, Inc.
-
- 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.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- Written by Brian Fox (bfox@ai.mit.edu). */
-
- #if !defined (_NODES_H_)
- #define _NODES_H_
-
- #include "general.h"
-
- /* **************************************************************** */
- /* */
- /* User Code Interface */
- /* */
- /* **************************************************************** */
-
- /* Callers generally only want the node itself. This structure is used
- to pass node information around. None of the information in this
- structure should ever be directly freed. The structure itself can
- be passed to free (). Note that NODE->parent is non-null if this
- node's file is a subfile. In that case, NODE->parent is the logical
- name of the file containing this node. Both names are given as full
- paths, so you might have: node->filename = "/gnu/info/emacs-1",
- with node->parent = "/usr/gnu/info/emacs". */
- typedef struct {
- char *filename; /* The physical file containing this node. */
- char *parent; /* Non-null is the logical file name. */
- char *nodename; /* The name of this node. */
- char *contents; /* Characters appearing in this node. */
- long nodelen; /* The length of the CONTENTS member. */
- int flags; /* See immediately below. */
- } NODE;
-
- /* Defines that can appear in NODE->flags. All informative. */
- #define N_HasTagsTable 0x01 /* This node was found through a tags table. */
- #define N_TagsIndirect 0x02 /* The tags table was an indirect one. */
- #define N_UpdateTags 0x04 /* The tags table is out of date. */
- #define N_IsCompressed 0x08 /* The file is compressed on disk. */
- #define N_IsInternal 0x10 /* This node was made by Info. */
- #define N_CannotGC 0x20 /* File buffer cannot be gc'ed. */
-
- /* **************************************************************** */
- /* */
- /* Internal Data Structures */
- /* */
- /* **************************************************************** */
-
- /* Some defines describing details about Info file contents. */
-
- /* String Constants. */
- #define INFO_FILE_LABEL "File:"
- #define INFO_NODE_LABEL "Node:"
- #define INFO_PREV_LABEL "Prev:"
- #define INFO_ALTPREV_LABEL "Previous:"
- #define INFO_NEXT_LABEL "Next:"
- #define INFO_UP_LABEL "Up:"
- #define INFO_MENU_LABEL "\n* Menu:"
- #define INFO_MENU_ENTRY_LABEL "\n* "
- #define INFO_XREF_LABEL "*Note"
- #define TAGS_TABLE_END_LABEL "\nEnd Tag Table"
- #define TAGS_TABLE_BEG_LABEL "Tag Table:\n"
- #define INDIRECT_TAGS_TABLE_LABEL "Indirect:\n"
- #define TAGS_TABLE_IS_INDIRECT_LABEL "(Indirect)"
-
- /* Character Constants. */
- #define INFO_COOKIE '\037'
- #define INFO_FF '\014'
- #define INFO_TAGSEP '\177'
-
- /* For each logical file that we have loaded, we keep a list of the names
- of the nodes that are found in that file. A pointer to a node in an
- info file is called a "tag". For split files, the tag pointer is
- "indirect"; that is, the pointer also contains the name of the split
- file where the node can be found. For non-split files, the filename
- member in the structure below simply contains the name of the current
- file. The following structure describes a single node within a file. */
- typedef struct {
- char *filename; /* The file where this node can be found. */
- char *nodename; /* The node pointed to by this tag. */
- long nodestart; /* The offset of the start of this node. */
- long nodelen; /* The length of this node. */
- } TAG;
-
- /* The following structure is used to remember information about the contents
- of Info files that we have loaded at least once before. The FINFO member
- is present so that we can reload the file if it has been modified since
- last being loaded. All of the arrays appearing within this structure
- are NULL terminated, and each array which can change size has a
- corresponding SLOTS member which says how many slots have been allocated
- (with malloc ()) for this array. */
- typedef struct {
- char *filename; /* The filename used to find this file. */
- char *fullpath; /* The full pathname of this info file. */
- struct stat finfo; /* Information about this file. */
- char *contents; /* The contents of this particular file. */
- long filesize; /* The number of bytes this file expands to. */
- char **subfiles; /* If non-null, the list of subfiles. */
- TAG **tags; /* If non-null, the indirect tags table. */
- int tags_slots; /* Number of slots allocated for TAGS. */
- int flags; /* Various flags. Mimics of N_* flags. */
- } FILE_BUFFER;
-
- /* **************************************************************** */
- /* */
- /* Externally Visible Functions */
- /* */
- /* **************************************************************** */
-
- /* Array of FILE_BUFFER * which represents the currently loaded info files. */
- extern FILE_BUFFER **info_loaded_files;
-
- /* The number of slots currently allocated to INFO_LOADED_FILES. */
- extern int info_loaded_files_slots;
-
- /* Locate the file named by FILENAME, and return the information structure
- describing this file. The file may appear in our list of loaded files
- already, or it may not. If it does not already appear, find the file,
- and add it to the list of loaded files. If the file cannot be found,
- return a NULL FILE_BUFFER *. */
- extern FILE_BUFFER *info_find_file ();
-
- /* Force load the file named FILENAME, and return the information structure
- describing this file. Even if the file was already loaded, this loads
- a new buffer, rebuilds tags and nodes, and returns a new FILE_BUFFER *. */
- extern FILE_BUFFER *info_load_file ();
-
- /* Return a pointer to a NODE structure for the Info node (FILENAME)NODENAME.
- FILENAME can be passed as NULL, in which case the filename of "dir" is used.
- NODENAME can be passed as NULL, in which case the nodename of "Top" is used.
- If the node cannot be found, return a NULL pointer. */
- extern NODE *info_get_node ();
-
- /* Return a pointer to a NODE structure for the Info node NODENAME in
- FILE_BUFFER. NODENAME can be passed as NULL, in which case the
- nodename of "Top" is used. If the node cannot be found, return a
- NULL pointer. */
- extern NODE *info_get_node_of_file_buffer ();
-
- /* Grovel FILE_BUFFER->contents finding tags and nodes, and filling in the
- various slots. This can also be used to rebuild a tag or node table. */
- extern void build_tags_and_nodes ();
-
- /* When non-zero, this is a string describing the most recent file error. */
- extern char *info_recent_file_error;
-
- #endif /* !_NODES_H_ */
-