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- /* dir.c -- How to build a special "dir" node from "localdir" files. */
-
- /* 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). */
-
- #include <stdio.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/file.h>
- #include <sys/errno.h>
- #include "info-utils.h"
- #include "filesys.h"
- #include "tilde.h"
-
- /* The "dir" node can be built from the contents of a file called "dir",
- with the addition of the menus of every file called "localdir" found in
- INFOPATH. */
-
- static void add_menu_to_file_buffer (), insert_text_into_fb_at_binding ();
-
- void
- maybe_build_dir_node (dirname, from_files_named)
- char *dirname;
- char *from_files_named;
- {
- FILE_BUFFER *dir_buffer;
-
- /* See if the file has already been loaded and exists. */
- dir_buffer = info_find_file (dirname);
-
- /* If there is no "dir" in the current info path, we cannot build one
- from nothing. */
- if (!dir_buffer)
- return;
-
- /* If this directory has already been built, return now. */
- if (dir_buffer->flags & N_CannotGC)
- return;
-
- dir_buffer->flags |= N_CannotGC;
-
- /* For every file named FROM_FILES_NAMED in the search path, add the
- contents of that file's menu to our "dir" node. */
- {
- struct stat finfo;
- char *this_dir;
- int namelen, path_index;
- int update_tags = 0;
-
- namelen = strlen (from_files_named);
- path_index = 0;
-
- /* Using each element of the path, check for "localdir". Do not check
- for "localdir.info.Z" or anything else. Only files explictly named
- "localdir" are eligible. This is a design decision. There can be
- an info file name "localdir.info" which contains information on the
- setting up of "localdir" files. */
- while (this_dir = extract_colon_unit (infopath, &path_index))
- {
- char *fullpath;
- int statable;
-
- /* Expand a leading tilde if one is present. */
- if (*this_dir == '~')
- {
- char *tilde_expanded_dirname;
-
- tilde_expanded_dirname = tilde_expand_word (this_dir);
- free (this_dir);
- this_dir = tilde_expanded_dirname;
- }
-
- fullpath = (char *)xmalloc (3 + strlen (this_dir) + namelen);
- strcpy (fullpath, this_dir);
- if (fullpath[strlen (fullpath) - 1] != '/')
- strcat (fullpath, "/");
- strcat (fullpath, from_files_named);
-
- statable = (stat (fullpath, &finfo) == 0);
-
- if (statable && S_ISREG (finfo.st_mode))
- {
- long filesize;
- char *contents;
-
- contents = filesys_read_info_file (fullpath, &filesize, &finfo);
-
- if (contents)
- {
- update_tags++;
- add_menu_to_file_buffer (contents, filesize, dir_buffer);
- free (contents);
- }
- }
-
- free (fullpath);
- free (this_dir);
- }
- if (update_tags)
- build_tags_and_nodes (dir_buffer);
- }
- }
-
- /* Given CONTENTS and FB (a file buffer), add the menu found in CONTENTS
- to the menu found in FB->contents. Second argument SIZE is the total
- size of CONTENTS. */
- static void
- add_menu_to_file_buffer (contents, size, fb)
- char *contents;
- long size;
- FILE_BUFFER *fb;
- {
- SEARCH_BINDING contents_binding, fb_binding;
- long contents_offset, fb_offset;
-
- contents_binding.buffer = contents;
- contents_binding.start = 0;
- contents_binding.end = size;
- contents_binding.flags = S_FoldCase | S_SkipDest;
-
- fb_binding.buffer = fb->contents;
- fb_binding.start = 0;
- fb_binding.end = fb->filesize;
- fb_binding.flags = S_FoldCase | S_SkipDest;
-
- /* Move to the start of the menus in CONTENTS and FB. */
- contents_offset = search_forward (INFO_MENU_LABEL, &contents_binding);
- fb_offset = search_forward (INFO_MENU_LABEL, &fb_binding);
-
- /* If there is no menu in CONTENTS, quit now. */
- if (contents_offset == -1)
- return;
-
- /* If there is no menu in FB, make one. */
- if (fb_offset == -1)
- {
- /* Find the start of the second node in this file buffer. If there
- is only one node, we will be adding the contents to the end of
- this node. */
- fb_offset = find_node_separator (&fb_binding);
-
- /* If not even a single node separator, give up. */
- if (fb_offset == -1)
- return;
-
- fb_binding.start = fb_offset;
- fb_binding.start +=
- skip_node_separator (fb_binding.buffer + fb_binding.start);
-
- /* Try to find the next node separator. */
- fb_offset = find_node_separator (&fb_binding);
-
- /* If found one, consider that the start of the menu. Otherwise, the
- start of this menu is the end of the file buffer (i.e., fb->size). */
- if (fb_offset != -1)
- fb_binding.start = fb_offset;
- else
- fb_binding.start = fb_binding.end;
-
- insert_text_into_fb_at_binding
- (fb, &fb_binding, INFO_MENU_LABEL, strlen (INFO_MENU_LABEL));
-
- fb_binding.buffer = fb->contents;
- fb_binding.start = 0;
- fb_binding.end = fb->filesize;
- fb_offset = search_forward (INFO_MENU_LABEL, &fb_binding);
- if (fb_offset == -1)
- abort ();
- }
-
- /* CONTENTS_OFFSET and FB_OFFSET point to the starts of the menus that
- appear in their respective buffers. Add the remainder of CONTENTS
- to the end of FB's menu. */
- fb_binding.start = fb_offset;
- fb_offset = find_node_separator (&fb_binding);
- if (fb_offset != -1)
- fb_binding.start = fb_offset;
- else
- fb_binding.start = fb_binding.end;
-
- insert_text_into_fb_at_binding
- (fb, &fb_binding, contents + contents_offset, size - contents_offset);
- }
-
- static void
- insert_text_into_fb_at_binding (fb, binding, text, textlen)
- FILE_BUFFER *fb;
- SEARCH_BINDING *binding;
- char *text;
- int textlen;
- {
- char *contents;
- long start, end;
-
- start = binding->start;
- end = fb->filesize;
-
- contents = (char *)xmalloc (fb->filesize + textlen + 1);
- memcpy (contents, fb->contents, start);
- memcpy (contents + start, text, textlen);
- memcpy (contents + start + textlen, fb->contents + start, end - start);
- free (fb->contents);
- fb->contents = contents;
- fb->filesize += textlen;
- fb->finfo.st_size = fb->filesize;
- }
-