d8b5c7ed06
This has big improvements to the .info file utility support and much recent OSS requires its features.
294 lines
9.0 KiB
C
294 lines
9.0 KiB
C
/* dir.c -- How to build a special "dir" node from "localdir" files.
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$Id: dir.c,v 1.6 1997/07/27 21:09:20 karl Exp $
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Copyright (C) 1993, 97 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Written by Brian Fox (bfox@ai.mit.edu). */
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#include "info.h"
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#include "info-utils.h"
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#include "filesys.h"
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#include "tilde.h"
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/* The "dir" node can be built from the contents of a file called "dir",
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with the addition of the menus of every file named in the array
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dirs_to_add which are found in INFOPATH. */
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static void add_menu_to_file_buffer (), insert_text_into_fb_at_binding ();
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static char *dirs_to_add[] = {
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"dir", "localdir", (char *)NULL
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};
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/* Return zero if the file represented in the stat structure TEST has
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already been seen, nonzero else. */
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typedef struct
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{
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unsigned long device;
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unsigned long inode;
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} dir_file_list_entry_type;
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static int
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new_dir_file_p (test)
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struct stat *test;
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{
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static unsigned dir_file_list_len = 0;
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static dir_file_list_entry_type *dir_file_list = NULL;
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unsigned i;
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for (i = 0; i < dir_file_list_len; i++)
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{
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dir_file_list_entry_type entry;
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entry = dir_file_list[i];
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if (entry.device == test->st_dev && entry.inode == test->st_ino)
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return 0;
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}
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dir_file_list_len++;
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dir_file_list = xrealloc (dir_file_list,
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dir_file_list_len * sizeof (dir_file_list_entry_type));
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dir_file_list[dir_file_list_len - 1].device = test->st_dev;
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dir_file_list[dir_file_list_len - 1].inode = test->st_ino;
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return 1;
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}
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void
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maybe_build_dir_node (dirname)
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char *dirname;
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{
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int path_index, update_tags;
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char *this_dir;
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FILE_BUFFER *dir_buffer = info_find_file (dirname);
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/* If there is no "dir" in the current info path, we cannot build one
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from nothing. */
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if (!dir_buffer)
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return;
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/* If this directory has already been built, return now. */
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if (dir_buffer->flags & N_CannotGC)
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return;
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/* Initialize the list we use to avoid reading the same dir file twice
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with the dir file just found. */
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new_dir_file_p (&dir_buffer->finfo);
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path_index = update_tags = 0;
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/* Using each element of the path, check for one of the files in
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DIRS_TO_ADD. Do not check for "localdir.info.Z" or anything else.
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Only files explictly named are eligible. This is a design decision.
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There can be an info file name "localdir.info" which contains
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information on the setting up of "localdir" files. */
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while ((this_dir = extract_colon_unit (infopath, &path_index)))
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{
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register int da_index;
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char *from_file;
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/* Expand a leading tilde if one is present. */
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if (*this_dir == '~')
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{
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char *tilde_expanded_dirname;
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tilde_expanded_dirname = tilde_expand_word (this_dir);
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if (tilde_expanded_dirname != this_dir)
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{
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free (this_dir);
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this_dir = tilde_expanded_dirname;
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}
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}
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/* For every different file named in DIRS_TO_ADD found in the
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search path, add that file's menu to our "dir" node. */
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for (da_index = 0; (from_file = dirs_to_add[da_index]); da_index++)
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{
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struct stat finfo;
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int statable;
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int namelen = strlen (from_file);
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char *fullpath = xmalloc (3 + strlen (this_dir) + namelen);
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strcpy (fullpath, this_dir);
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if (fullpath[strlen (fullpath) - 1] != '/')
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strcat (fullpath, "/");
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strcat (fullpath, from_file);
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statable = (stat (fullpath, &finfo) == 0);
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/* Only add this file if we have not seen it before. */
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if (statable && S_ISREG (finfo.st_mode) && new_dir_file_p (&finfo))
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{
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long filesize;
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char *contents = filesys_read_info_file (fullpath, &filesize,
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&finfo);
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if (contents)
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{
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update_tags++;
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add_menu_to_file_buffer (contents, filesize, dir_buffer);
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free (contents);
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}
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}
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free (fullpath);
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}
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free (this_dir);
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}
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if (update_tags)
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build_tags_and_nodes (dir_buffer);
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/* Flag that the dir buffer has been built. */
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dir_buffer->flags |= N_CannotGC;
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}
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/* Given CONTENTS and FB (a file buffer), add the menu found in CONTENTS
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to the menu found in FB->contents. Second argument SIZE is the total
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size of CONTENTS. */
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static void
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add_menu_to_file_buffer (contents, size, fb)
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char *contents;
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long size;
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FILE_BUFFER *fb;
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{
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SEARCH_BINDING contents_binding, fb_binding;
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long contents_offset, fb_offset;
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contents_binding.buffer = contents;
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contents_binding.start = 0;
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contents_binding.end = size;
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contents_binding.flags = S_FoldCase | S_SkipDest;
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fb_binding.buffer = fb->contents;
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fb_binding.start = 0;
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fb_binding.end = fb->filesize;
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fb_binding.flags = S_FoldCase | S_SkipDest;
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/* Move to the start of the menus in CONTENTS and FB. */
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contents_offset = search_forward (INFO_MENU_LABEL, &contents_binding);
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fb_offset = search_forward (INFO_MENU_LABEL, &fb_binding);
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/* If there is no menu in CONTENTS, quit now. */
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if (contents_offset == -1)
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return;
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/* There is a menu in CONTENTS, and contents_offset points to the first
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character following the menu starter string. Skip all whitespace
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and newline characters. */
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contents_offset += skip_whitespace_and_newlines (contents + contents_offset);
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/* If there is no menu in FB, make one. */
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if (fb_offset == -1)
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{
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/* Find the start of the second node in this file buffer. If there
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is only one node, we will be adding the contents to the end of
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this node. */
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fb_offset = find_node_separator (&fb_binding);
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/* If not even a single node separator, give up. */
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if (fb_offset == -1)
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return;
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fb_binding.start = fb_offset;
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fb_binding.start +=
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skip_node_separator (fb_binding.buffer + fb_binding.start);
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/* Try to find the next node separator. */
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fb_offset = find_node_separator (&fb_binding);
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/* If found one, consider that the start of the menu. Otherwise, the
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start of this menu is the end of the file buffer (i.e., fb->size). */
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if (fb_offset != -1)
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fb_binding.start = fb_offset;
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else
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fb_binding.start = fb_binding.end;
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insert_text_into_fb_at_binding
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(fb, &fb_binding, INFO_MENU_LABEL, strlen (INFO_MENU_LABEL));
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fb_binding.buffer = fb->contents;
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fb_binding.start = 0;
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fb_binding.end = fb->filesize;
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fb_offset = search_forward (INFO_MENU_LABEL, &fb_binding);
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if (fb_offset == -1)
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abort ();
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}
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/* CONTENTS_OFFSET and FB_OFFSET point to the starts of the menus that
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appear in their respective buffers. Add the remainder of CONTENTS
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to the end of FB's menu. */
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fb_binding.start = fb_offset;
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fb_offset = find_node_separator (&fb_binding);
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if (fb_offset != -1)
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fb_binding.start = fb_offset;
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else
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fb_binding.start = fb_binding.end;
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/* Leave exactly one blank line between directory entries. */
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{
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int num_found = 0;
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while ((fb_binding.start > 0) &&
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(whitespace_or_newline (fb_binding.buffer[fb_binding.start - 1])))
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{
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num_found++;
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fb_binding.start--;
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}
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/* Optimize if possible. */
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if (num_found >= 2)
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{
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fb_binding.buffer[fb_binding.start++] = '\n';
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fb_binding.buffer[fb_binding.start++] = '\n';
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}
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else
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{
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/* Do it the hard way. */
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insert_text_into_fb_at_binding (fb, &fb_binding, "\n\n", 2);
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fb_binding.start += 2;
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}
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}
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/* Insert the new menu. */
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insert_text_into_fb_at_binding
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(fb, &fb_binding, contents + contents_offset, size - contents_offset);
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}
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static void
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insert_text_into_fb_at_binding (fb, binding, text, textlen)
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FILE_BUFFER *fb;
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SEARCH_BINDING *binding;
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char *text;
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int textlen;
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{
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char *contents;
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long start, end;
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start = binding->start;
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end = fb->filesize;
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contents = (char *)xmalloc (fb->filesize + textlen + 1);
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memcpy (contents, fb->contents, start);
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memcpy (contents + start, text, textlen);
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memcpy (contents + start + textlen, fb->contents + start, end - start);
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free (fb->contents);
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fb->contents = contents;
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fb->filesize += textlen;
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fb->finfo.st_size = fb->filesize;
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}
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