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diff --git a/lib/exclude.c b/lib/exclude.c
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+++ b/lib/exclude.c
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+/* exclude.c -- exclude file names
+
+ Copyright (C) 1992, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003,
+ 2004, 2005, 2006, 2007 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; see the file COPYING.
+ If not, write to the Free Software Foundation,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Written by Paul Eggert <eggert@twinsun.com> */
+
+#include <config.h>
+
+#include <stdbool.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "exclude.h"
+#include "fnmatch.h"
+#include "xalloc.h"
+#include "verify.h"
+
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+#endif
+
+/* Non-GNU systems lack these options, so we don't need to check them. */
+#ifndef FNM_CASEFOLD
+# define FNM_CASEFOLD 0
+#endif
+#ifndef FNM_EXTMATCH
+# define FNM_EXTMATCH 0
+#endif
+#ifndef FNM_LEADING_DIR
+# define FNM_LEADING_DIR 0
+#endif
+
+verify (((EXCLUDE_ANCHORED | EXCLUDE_INCLUDE | EXCLUDE_WILDCARDS)
+ & (FNM_PATHNAME | FNM_NOESCAPE | FNM_PERIOD | FNM_LEADING_DIR
+ | FNM_CASEFOLD | FNM_EXTMATCH))
+ == 0);
+
+/* An exclude pattern-options pair. The options are fnmatch options
+ ORed with EXCLUDE_* options. */
+
+struct patopts
+ {
+ char const *pattern;
+ int options;
+ };
+
+/* An exclude list, of pattern-options pairs. */
+
+struct exclude
+ {
+ struct patopts *exclude;
+ size_t exclude_alloc;
+ size_t exclude_count;
+ };
+
+/* Return a newly allocated and empty exclude list. */
+
+struct exclude *
+new_exclude (void)
+{
+ return xzalloc (sizeof *new_exclude ());
+}
+
+/* Free the storage associated with an exclude list. */
+
+void
+free_exclude (struct exclude *ex)
+{
+ free (ex->exclude);
+ free (ex);
+}
+
+/* Return zero if PATTERN matches F, obeying OPTIONS, except that
+ (unlike fnmatch) wildcards are disabled in PATTERN. */
+
+static int
+fnmatch_no_wildcards (char const *pattern, char const *f, int options)
+{
+ if (! (options & FNM_LEADING_DIR))
+ return ((options & FNM_CASEFOLD)
+ ? mbscasecmp (pattern, f)
+ : strcmp (pattern, f));
+ else if (! (options & FNM_CASEFOLD))
+ {
+ size_t patlen = strlen (pattern);
+ int r = strncmp (pattern, f, patlen);
+ if (! r)
+ {
+ r = f[patlen];
+ if (r == '/')
+ r = 0;
+ }
+ return r;
+ }
+ else
+ {
+ /* Walk through a copy of F, seeing whether P matches any prefix
+ of F.
+
+ FIXME: This is an O(N**2) algorithm; it should be O(N).
+ Also, the copy should not be necessary. However, fixing this
+ will probably involve a change to the mbs* API. */
+
+ char *fcopy = xstrdup (f);
+ char *p;
+ int r;
+ for (p = fcopy; ; *p++ = '/')
+ {
+ p = strchr (p, '/');
+ if (p)
+ *p = '\0';
+ r = mbscasecmp (pattern, fcopy);
+ if (!p || r <= 0)
+ break;
+ }
+ free (fcopy);
+ return r;
+ }
+}
+
+bool
+exclude_fnmatch (char const *pattern, char const *f, int options)
+{
+ int (*matcher) (char const *, char const *, int) =
+ (options & EXCLUDE_WILDCARDS
+ ? fnmatch
+ : fnmatch_no_wildcards);
+ bool matched = ((*matcher) (pattern, f, options) == 0);
+ char const *p;
+
+ if (! (options & EXCLUDE_ANCHORED))
+ for (p = f; *p && ! matched; p++)
+ if (*p == '/' && p[1] != '/')
+ matched = ((*matcher) (pattern, p + 1, options) == 0);
+
+ return matched;
+}
+
+/* Return true if EX excludes F. */
+
+bool
+excluded_file_name (struct exclude const *ex, char const *f)
+{
+ size_t exclude_count = ex->exclude_count;
+
+ /* If no options are given, the default is to include. */
+ if (exclude_count == 0)
+ return false;
+ else
+ {
+ struct patopts const *exclude = ex->exclude;
+ size_t i;
+
+ /* Otherwise, the default is the opposite of the first option. */
+ bool excluded = !! (exclude[0].options & EXCLUDE_INCLUDE);
+
+ /* Scan through the options, seeing whether they change F from
+ excluded to included or vice versa. */
+ for (i = 0; i < exclude_count; i++)
+ {
+ char const *pattern = exclude[i].pattern;
+ int options = exclude[i].options;
+ if (excluded == !! (options & EXCLUDE_INCLUDE))
+ excluded ^= exclude_fnmatch (pattern, f, options);
+ }
+
+ return excluded;
+ }
+}
+
+/* Append to EX the exclusion PATTERN with OPTIONS. */
+
+void
+add_exclude (struct exclude *ex, char const *pattern, int options)
+{
+ struct patopts *patopts;
+
+ if (ex->exclude_count == ex->exclude_alloc)
+ ex->exclude = x2nrealloc (ex->exclude, &ex->exclude_alloc,
+ sizeof *ex->exclude);
+
+ patopts = &ex->exclude[ex->exclude_count++];
+ patopts->pattern = pattern;
+ patopts->options = options;
+}
+
+/* Use ADD_FUNC to append to EX the patterns in FILE_NAME, each with
+ OPTIONS. LINE_END terminates each pattern in the file. If
+ LINE_END is a space character, ignore trailing spaces and empty
+ lines in FILE. Return -1 on failure, 0 on success. */
+
+int
+add_exclude_file (void (*add_func) (struct exclude *, char const *, int),
+ struct exclude *ex, char const *file_name, int options,
+ char line_end)
+{
+ bool use_stdin = file_name[0] == '-' && !file_name[1];
+ FILE *in;
+ char *buf = NULL;
+ char *p;
+ char const *pattern;
+ char const *lim;
+ size_t buf_alloc = 0;
+ size_t buf_count = 0;
+ int c;
+ int e = 0;
+
+ if (use_stdin)
+ in = stdin;
+ else if (! (in = fopen (file_name, "r")))
+ return -1;
+
+ while ((c = getc (in)) != EOF)
+ {
+ if (buf_count == buf_alloc)
+ buf = x2realloc (buf, &buf_alloc);
+ buf[buf_count++] = c;
+ }
+
+ if (ferror (in))
+ e = errno;
+
+ if (!use_stdin && fclose (in) != 0)
+ e = errno;
+
+ buf = xrealloc (buf, buf_count + 1);
+ buf[buf_count] = line_end;
+ lim = buf + buf_count + ! (buf_count == 0 || buf[buf_count - 1] == line_end);
+ pattern = buf;
+
+ for (p = buf; p < lim; p++)
+ if (*p == line_end)
+ {
+ char *pattern_end = p;
+
+ if (isspace ((unsigned char) line_end))
+ {
+ for (; ; pattern_end--)
+ if (pattern_end == pattern)
+ goto next_pattern;
+ else if (! isspace ((unsigned char) pattern_end[-1]))
+ break;
+ }
+
+ *pattern_end = '\0';
+ (*add_func) (ex, pattern, options);
+
+ next_pattern:
+ pattern = p + 1;
+ }
+
+ errno = e;
+ return e ? -1 : 0;
+}
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