157 lines
7.4 KiB
C
157 lines
7.4 KiB
C
/* nodes.h -- How we represent nodes internally.
|
||
$Id: nodes.h,v 1.3 2004/04/11 17:56:46 karl Exp $
|
||
|
||
Copyright (C) 1993, 1997, 1998, 2002, 2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||
|
||
Written by Brian Fox (bfox@ai.mit.edu). */
|
||
|
||
#ifndef NODES_H
|
||
#define NODES_H
|
||
|
||
#include "info.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 = "/usr/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. */
|
||
unsigned long display_pos; /* Where to display at, if nonzero. */
|
||
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#define N_UpdateTags 0x04 /* The tags table is out of date.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. */
|
||
#define N_IsManPage 0x40 /* This node is a manpage. */
|
||
#define N_FromAnchor 0x80 /* Synthesized for an anchor reference. */
|
||
|
||
/* Internal data structures. */
|
||
|
||
/* String constants. */
|
||
#define INFO_FILE_LABEL "File:"
|
||
#define INFO_REF_LABEL "Ref:"
|
||
#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 (char *filename);
|
||
|
||
/* 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 (char *filename);
|
||
|
||
/* 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 (char *filename, char *nodename);
|
||
|
||
/* 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 (char *nodename,
|
||
FILE_BUFFER *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 (FILE_BUFFER *file_buffer);
|
||
|
||
/* When non-zero, this is a string describing the most recent file error. */
|
||
extern char *info_recent_file_error;
|
||
|
||
/* Create a new, empty file buffer. */
|
||
extern FILE_BUFFER *make_file_buffer (void);
|
||
|
||
#endif /* not NODES_H */
|