712 lines
19 KiB
C
712 lines
19 KiB
C
/* filesys.c -- filesystem specific functions.
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$Id: filesys.c,v 1.6 2004/07/30 17:17:40 karl Exp $
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Copyright (C) 1993, 1997, 1998, 2000, 2002, 2003, 2004 Free Software
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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 "tilde.h"
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#include "filesys.h"
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/* Local to this file. */
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static char *info_file_in_path (char *filename, char *path);
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static char *lookup_info_filename (char *filename);
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static char *info_absolute_file (char *fname);
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static void remember_info_filename (char *filename, char *expansion);
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static void maybe_initialize_infopath (void);
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typedef struct
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{
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char *suffix;
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char *decompressor;
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} COMPRESSION_ALIST;
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static char *info_suffixes[] = {
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".info",
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"-info",
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"/index",
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".inf", /* 8+3 file on filesystem which supports long file names */
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#ifdef __MSDOS__
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/* 8+3 file names strike again... */
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".in", /* for .inz, .igz etc. */
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".i",
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#endif
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"",
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NULL
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};
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static COMPRESSION_ALIST compress_suffixes[] = {
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{ ".gz", "gunzip" },
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{ ".bz2", "bunzip2" },
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{ ".z", "gunzip" },
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{ ".Z", "uncompress" },
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{ ".Y", "unyabba" },
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#ifdef __MSDOS__
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{ "gz", "gunzip" },
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{ "z", "gunzip" },
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#endif
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{ (char *)NULL, (char *)NULL }
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};
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/* The path on which we look for info files. You can initialize this
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from the environment variable INFOPATH if there is one, or you can
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call info_add_path () to add paths to the beginning or end of it.
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You can call zap_infopath () to make the path go away. */
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char *infopath = (char *)NULL;
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static int infopath_size = 0;
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/* Expand the filename in PARTIAL to make a real name for this operating
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system. This looks in INFO_PATHS in order to find the correct file.
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If it can't find the file, it returns NULL. */
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static char *local_temp_filename = (char *)NULL;
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static int local_temp_filename_size = 0;
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char *
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info_find_fullpath (char *partial)
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{
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int initial_character;
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char *temp;
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filesys_error_number = 0;
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maybe_initialize_infopath ();
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if (partial && (initial_character = *partial))
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{
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char *expansion;
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expansion = lookup_info_filename (partial);
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if (expansion)
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return (expansion);
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/* If we have the full path to this file, we still may have to add
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various extensions to it. I guess we have to stat this file
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after all. */
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if (IS_ABSOLUTE (partial))
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temp = info_absolute_file (partial);
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else if (initial_character == '~')
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{
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expansion = tilde_expand_word (partial);
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if (IS_ABSOLUTE (expansion))
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{
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temp = info_absolute_file (expansion);
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free (expansion);
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}
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else
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temp = expansion;
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}
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else if (initial_character == '.' &&
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(IS_SLASH (partial[1]) ||
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(partial[1] == '.' && IS_SLASH (partial[2]))))
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{
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if (local_temp_filename_size < 1024)
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local_temp_filename = (char *)xrealloc
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(local_temp_filename, (local_temp_filename_size = 1024));
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#if defined (HAVE_GETCWD)
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if (!getcwd (local_temp_filename, local_temp_filename_size))
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#else /* !HAVE_GETCWD */
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if (!getwd (local_temp_filename))
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#endif /* !HAVE_GETCWD */
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{
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filesys_error_number = errno;
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return (partial);
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}
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strcat (local_temp_filename, "/");
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strcat (local_temp_filename, partial);
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temp = info_absolute_file (local_temp_filename); /* try extensions */
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if (!temp)
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partial = local_temp_filename;
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}
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else
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temp = info_file_in_path (partial, infopath);
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if (temp)
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{
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remember_info_filename (partial, temp);
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if (strlen (temp) > (unsigned int) local_temp_filename_size)
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local_temp_filename = (char *) xrealloc
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(local_temp_filename,
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(local_temp_filename_size = (50 + strlen (temp))));
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strcpy (local_temp_filename, temp);
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free (temp);
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return (local_temp_filename);
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}
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}
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return (partial);
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}
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/* Scan the list of directories in PATH looking for FILENAME. If we find
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one that is a regular file, return it as a new string. Otherwise, return
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a NULL pointer. */
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static char *
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info_file_in_path (char *filename, char *path)
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{
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struct stat finfo;
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char *temp_dirname;
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int statable, dirname_index;
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/* Reject ridiculous cases up front, to prevent infinite recursion
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later on. E.g., someone might say "info '(.)foo'"... */
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if (!*filename || STREQ (filename, ".") || STREQ (filename, ".."))
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return NULL;
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dirname_index = 0;
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while ((temp_dirname = extract_colon_unit (path, &dirname_index)))
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{
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register int i, pre_suffix_length;
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char *temp;
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/* Expand a leading tilde if one is present. */
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if (*temp_dirname == '~')
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{
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char *expanded_dirname;
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expanded_dirname = tilde_expand_word (temp_dirname);
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free (temp_dirname);
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temp_dirname = expanded_dirname;
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}
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temp = (char *)xmalloc (30 + strlen (temp_dirname) + strlen (filename));
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strcpy (temp, temp_dirname);
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if (!IS_SLASH (temp[(strlen (temp)) - 1]))
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strcat (temp, "/");
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strcat (temp, filename);
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pre_suffix_length = strlen (temp);
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free (temp_dirname);
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for (i = 0; info_suffixes[i]; i++)
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{
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strcpy (temp + pre_suffix_length, info_suffixes[i]);
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statable = (stat (temp, &finfo) == 0);
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/* If we have found a regular file, then use that. Else, if we
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have found a directory, look in that directory for this file. */
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if (statable)
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{
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if (S_ISREG (finfo.st_mode))
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{
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return (temp);
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}
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else if (S_ISDIR (finfo.st_mode))
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{
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char *newpath, *filename_only, *newtemp;
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newpath = xstrdup (temp);
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filename_only = filename_non_directory (filename);
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newtemp = info_file_in_path (filename_only, newpath);
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free (newpath);
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if (newtemp)
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{
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free (temp);
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return (newtemp);
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}
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}
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}
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else
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{
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/* Add various compression suffixes to the name to see if
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the file is present in compressed format. */
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register int j, pre_compress_suffix_length;
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pre_compress_suffix_length = strlen (temp);
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for (j = 0; compress_suffixes[j].suffix; j++)
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{
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strcpy (temp + pre_compress_suffix_length,
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compress_suffixes[j].suffix);
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statable = (stat (temp, &finfo) == 0);
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if (statable && (S_ISREG (finfo.st_mode)))
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return (temp);
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}
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}
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}
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free (temp);
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}
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return ((char *)NULL);
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}
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/* Assume FNAME is an absolute file name, and check whether it is
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a regular file. If it is, return it as a new string; otherwise
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return a NULL pointer. We do it by taking the file name apart
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into its directory and basename parts, and calling info_file_in_path.*/
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static char *
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info_absolute_file (char *fname)
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{
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char *containing_dir = xstrdup (fname);
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char *base = filename_non_directory (containing_dir);
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if (base > containing_dir)
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base[-1] = '\0';
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return info_file_in_path (filename_non_directory (fname), containing_dir);
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}
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/* Given a string containing units of information separated by the
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PATH_SEP character, return the next one after IDX, or NULL if there
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are no more. Advance IDX to the character after the colon. */
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char *
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extract_colon_unit (char *string, int *idx)
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{
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unsigned int i = (unsigned int) *idx;
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unsigned int start = i;
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if (!string || i >= strlen (string))
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return NULL;
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if (!string[i]) /* end of string */
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return NULL;
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/* Advance to next PATH_SEP. */
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while (string[i] && string[i] != PATH_SEP[0])
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i++;
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{
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char *value = xmalloc ((i - start) + 1);
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strncpy (value, &string[start], (i - start));
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value[i - start] = 0;
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i++; /* move past PATH_SEP */
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*idx = i;
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return value;
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}
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}
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/* A structure which associates a filename with its expansion. */
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typedef struct
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{
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char *filename;
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char *expansion;
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} FILENAME_LIST;
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/* An array of remembered arguments and results. */
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static FILENAME_LIST **names_and_files = (FILENAME_LIST **)NULL;
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static int names_and_files_index = 0;
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static int names_and_files_slots = 0;
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/* Find the result for having already called info_find_fullpath () with
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FILENAME. */
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static char *
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lookup_info_filename (char *filename)
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{
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if (filename && names_and_files)
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{
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register int i;
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for (i = 0; names_and_files[i]; i++)
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{
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if (FILENAME_CMP (names_and_files[i]->filename, filename) == 0)
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return (names_and_files[i]->expansion);
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}
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}
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return (char *)NULL;;
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}
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/* Add a filename and its expansion to our list. */
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static void
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remember_info_filename (char *filename, char *expansion)
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{
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FILENAME_LIST *new;
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if (names_and_files_index + 2 > names_and_files_slots)
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{
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int alloc_size;
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names_and_files_slots += 10;
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alloc_size = names_and_files_slots * sizeof (FILENAME_LIST *);
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names_and_files =
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(FILENAME_LIST **) xrealloc (names_and_files, alloc_size);
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}
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new = (FILENAME_LIST *)xmalloc (sizeof (FILENAME_LIST));
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new->filename = xstrdup (filename);
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new->expansion = expansion ? xstrdup (expansion) : (char *)NULL;
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names_and_files[names_and_files_index++] = new;
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names_and_files[names_and_files_index] = (FILENAME_LIST *)NULL;
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}
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static void
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maybe_initialize_infopath (void)
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{
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if (!infopath_size)
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{
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infopath = (char *)
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xmalloc (infopath_size = (1 + strlen (DEFAULT_INFOPATH)));
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strcpy (infopath, DEFAULT_INFOPATH);
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}
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}
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/* Add PATH to the list of paths found in INFOPATH. 2nd argument says
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whether to put PATH at the front or end of INFOPATH. */
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void
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info_add_path (char *path, int where)
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{
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int len;
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if (!infopath)
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{
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infopath = (char *)xmalloc (infopath_size = 200 + strlen (path));
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infopath[0] = '\0';
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}
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len = strlen (path) + strlen (infopath);
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if (len + 2 >= infopath_size)
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infopath = (char *)xrealloc (infopath, (infopath_size += (2 * len) + 2));
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if (!*infopath)
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strcpy (infopath, path);
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else if (where == INFOPATH_APPEND)
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{
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strcat (infopath, PATH_SEP);
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strcat (infopath, path);
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}
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else if (where == INFOPATH_PREPEND)
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{
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char *temp = xstrdup (infopath);
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strcpy (infopath, path);
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strcat (infopath, PATH_SEP);
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strcat (infopath, temp);
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free (temp);
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}
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}
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/* Make INFOPATH have absolutely nothing in it. */
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void
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zap_infopath (void)
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{
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if (infopath)
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free (infopath);
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infopath = (char *)NULL;
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infopath_size = 0;
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}
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/* Given a chunk of text and its length, convert all CRLF pairs at every
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end-of-line into a single Newline character. Return the length of
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produced text.
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This is required because the rest of code is too entrenched in having
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a single newline at each EOL; in particular, searching for various
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Info headers and cookies can become extremely tricky if that assumption
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breaks.
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FIXME: this could also support Mac-style text files with a single CR
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at the EOL, but what about random CR characters in non-Mac files? Can
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we afford converting them into newlines as well? Maybe implement some
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heuristics here, like in Emacs 20.
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FIXME: is it a good idea to show the EOL type on the modeline? */
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long
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convert_eols (char *text, long int textlen)
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{
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register char *s = text;
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register char *d = text;
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while (textlen--)
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{
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if (*s == '\r' && textlen && s[1] == '\n')
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{
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s++;
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textlen--;
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}
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*d++ = *s++;
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}
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return (long)(d - text);
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}
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/* Read the contents of PATHNAME, returning a buffer with the contents of
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that file in it, and returning the size of that buffer in FILESIZE.
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FINFO is a stat struct which has already been filled in by the caller.
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If the file turns out to be compressed, set IS_COMPRESSED to non-zero.
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If the file cannot be read, return a NULL pointer. */
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char *
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filesys_read_info_file (char *pathname, long int *filesize,
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struct stat *finfo, int *is_compressed)
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{
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long st_size;
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*filesize = filesys_error_number = 0;
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if (compressed_filename_p (pathname))
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{
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*is_compressed = 1;
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return (filesys_read_compressed (pathname, filesize));
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}
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else
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{
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int descriptor;
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char *contents;
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*is_compressed = 0;
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descriptor = open (pathname, O_RDONLY | O_BINARY, 0666);
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/* If the file couldn't be opened, give up. */
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if (descriptor < 0)
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{
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filesys_error_number = errno;
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return ((char *)NULL);
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}
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/* Try to read the contents of this file. */
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st_size = (long) finfo->st_size;
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contents = (char *)xmalloc (1 + st_size);
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if ((read (descriptor, contents, st_size)) != st_size)
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{
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filesys_error_number = errno;
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close (descriptor);
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free (contents);
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return ((char *)NULL);
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}
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close (descriptor);
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/* Convert any DOS-style CRLF EOLs into Unix-style NL.
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Seems like a good idea to have even on Unix, in case the Info
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files are coming from some Windows system across a network. */
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*filesize = convert_eols (contents, st_size);
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/* EOL conversion can shrink the text quite a bit. We don't
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want to waste storage. */
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if (*filesize < st_size)
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contents = (char *)xrealloc (contents, 1 + *filesize);
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contents[*filesize] = '\0';
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return (contents);
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}
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}
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/* Typically, pipe buffers are 4k. */
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#define BASIC_PIPE_BUFFER (4 * 1024)
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/* We use some large multiple of that. */
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#define FILESYS_PIPE_BUFFER_SIZE (16 * BASIC_PIPE_BUFFER)
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char *
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filesys_read_compressed (char *pathname, long int *filesize)
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{
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FILE *stream;
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char *command, *decompressor;
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char *contents = (char *)NULL;
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*filesize = filesys_error_number = 0;
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decompressor = filesys_decompressor_for_file (pathname);
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if (!decompressor)
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return ((char *)NULL);
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command = (char *)xmalloc (15 + strlen (pathname) + strlen (decompressor));
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/* Explicit .exe suffix makes the diagnostics of `popen'
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better on systems where COMMAND.COM is the stock shell. */
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sprintf (command, "%s%s < %s",
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decompressor, STRIP_DOT_EXE ? ".exe" : "", pathname);
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#if !defined (BUILDING_LIBRARY)
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if (info_windows_initialized_p)
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{
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char *temp;
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temp = (char *)xmalloc (5 + strlen (command));
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sprintf (temp, "%s...", command);
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message_in_echo_area ("%s", temp, NULL);
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free (temp);
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}
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#endif /* !BUILDING_LIBRARY */
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stream = popen (command, FOPEN_RBIN);
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free (command);
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|
||
/* Read chunks from this file until there are none left to read. */
|
||
if (stream)
|
||
{
|
||
long offset, size;
|
||
char *chunk;
|
||
|
||
offset = size = 0;
|
||
chunk = (char *)xmalloc (FILESYS_PIPE_BUFFER_SIZE);
|
||
|
||
while (1)
|
||
{
|
||
int bytes_read;
|
||
|
||
bytes_read = fread (chunk, 1, FILESYS_PIPE_BUFFER_SIZE, stream);
|
||
|
||
if (bytes_read + offset >= size)
|
||
contents = (char *)xrealloc
|
||
(contents, size += (2 * FILESYS_PIPE_BUFFER_SIZE));
|
||
|
||
memcpy (contents + offset, chunk, bytes_read);
|
||
offset += bytes_read;
|
||
if (bytes_read != FILESYS_PIPE_BUFFER_SIZE)
|
||
break;
|
||
}
|
||
|
||
free (chunk);
|
||
if (pclose (stream) == -1)
|
||
{
|
||
if (contents)
|
||
free (contents);
|
||
contents = (char *)NULL;
|
||
filesys_error_number = errno;
|
||
}
|
||
else
|
||
{
|
||
*filesize = convert_eols (contents, offset);
|
||
contents = (char *)xrealloc (contents, 1 + *filesize);
|
||
contents[*filesize] = '\0';
|
||
}
|
||
}
|
||
else
|
||
{
|
||
filesys_error_number = errno;
|
||
}
|
||
|
||
#if !defined (BUILDING_LIBARARY)
|
||
if (info_windows_initialized_p)
|
||
unmessage_in_echo_area ();
|
||
#endif /* !BUILDING_LIBRARY */
|
||
return (contents);
|
||
}
|
||
|
||
/* Return non-zero if FILENAME belongs to a compressed file. */
|
||
int
|
||
compressed_filename_p (char *filename)
|
||
{
|
||
char *decompressor;
|
||
|
||
/* Find the final extension of this filename, and see if it matches one
|
||
of our known ones. */
|
||
decompressor = filesys_decompressor_for_file (filename);
|
||
|
||
if (decompressor)
|
||
return (1);
|
||
else
|
||
return (0);
|
||
}
|
||
|
||
/* Return the command string that would be used to decompress FILENAME. */
|
||
char *
|
||
filesys_decompressor_for_file (char *filename)
|
||
{
|
||
register int i;
|
||
char *extension = (char *)NULL;
|
||
|
||
/* Find the final extension of FILENAME, and see if it appears in our
|
||
list of known compression extensions. */
|
||
for (i = strlen (filename) - 1; i > 0; i--)
|
||
if (filename[i] == '.')
|
||
{
|
||
extension = filename + i;
|
||
break;
|
||
}
|
||
|
||
if (!extension)
|
||
return ((char *)NULL);
|
||
|
||
for (i = 0; compress_suffixes[i].suffix; i++)
|
||
if (FILENAME_CMP (extension, compress_suffixes[i].suffix) == 0)
|
||
return (compress_suffixes[i].decompressor);
|
||
|
||
#if defined (__MSDOS__)
|
||
/* If no other suffix matched, allow any extension which ends
|
||
with `z' to be decompressed by gunzip. Due to limited 8+3 DOS
|
||
file namespace, we can expect many such cases, and supporting
|
||
every weird suffix thus produced would be a pain. */
|
||
if (extension[strlen (extension) - 1] == 'z' ||
|
||
extension[strlen (extension) - 1] == 'Z')
|
||
return "gunzip";
|
||
#endif
|
||
|
||
return ((char *)NULL);
|
||
}
|
||
|
||
/* The number of the most recent file system error. */
|
||
int filesys_error_number = 0;
|
||
|
||
/* A function which returns a pointer to a static buffer containing
|
||
an error message for FILENAME and ERROR_NUM. */
|
||
static char *errmsg_buf = (char *)NULL;
|
||
static int errmsg_buf_size = 0;
|
||
|
||
char *
|
||
filesys_error_string (char *filename, int error_num)
|
||
{
|
||
int len;
|
||
char *result;
|
||
|
||
if (error_num == 0)
|
||
return ((char *)NULL);
|
||
|
||
result = strerror (error_num);
|
||
|
||
len = 4 + strlen (filename) + strlen (result);
|
||
if (len >= errmsg_buf_size)
|
||
errmsg_buf = (char *)xrealloc (errmsg_buf, (errmsg_buf_size = 2 + len));
|
||
|
||
sprintf (errmsg_buf, "%s: %s", filename, result);
|
||
return (errmsg_buf);
|
||
}
|
||
|
||
|
||
/* Check for "dir" with all the possible info and compression suffixes,
|
||
in combination. */
|
||
|
||
int
|
||
is_dir_name (char *filename)
|
||
{
|
||
unsigned i;
|
||
|
||
for (i = 0; info_suffixes[i]; i++)
|
||
{
|
||
unsigned c;
|
||
char trydir[50];
|
||
strcpy (trydir, "dir");
|
||
strcat (trydir, info_suffixes[i]);
|
||
|
||
if (strcasecmp (filename, trydir) == 0)
|
||
return 1;
|
||
|
||
for (c = 0; compress_suffixes[c].suffix; c++)
|
||
{
|
||
char dir_compressed[50]; /* can be short */
|
||
strcpy (dir_compressed, trydir);
|
||
strcat (dir_compressed, compress_suffixes[c].suffix);
|
||
if (strcasecmp (filename, dir_compressed) == 0)
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|