Virgin import of diffutils 2.8.7.

1 files changed, 263 insertions, 0 deletions

diff --git a/contrib/diff/lib/exclude.c b/contrib/diff/lib/exclude.c
new file mode 100644
index 0000000..55f1a39
--- /dev/null
+++ b/contrib/diff/lib/exclude.c
@@ -0,0 +1,263 @@
+/* exclude.c -- exclude file names
+
+   Copyright (C) 1992, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003 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,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Paul Eggert <eggert@twinsun.com>  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdbool.h>
+
+#include <ctype.h>
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "exclude.h"
+#include "fnmatch.h"
+#include "unlocked-io.h"
+#include "xalloc.h"
+
+#if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
+# define IN_CTYPE_DOMAIN(c) true
+#else
+# define IN_CTYPE_DOMAIN(c) isascii (c)
+#endif
+
+static inline bool
+is_space (unsigned char c)
+{
+  return IN_CTYPE_DOMAIN (c) && isspace (c);
+}
+
+/* Verify a requirement at compile-time (unlike assert, which is runtime).  */
+#define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
+
+/* Non-GNU systems lack these options, so we don't need to check them.  */
+#ifndef FNM_CASEFOLD
+# define FNM_CASEFOLD 0
+#endif
+#ifndef FNM_LEADING_DIR
+# define FNM_LEADING_DIR 0
+#endif
+
+verify (EXCLUDE_macros_do_not_collide_with_FNM_macros,
+	(((EXCLUDE_ANCHORED | EXCLUDE_INCLUDE | EXCLUDE_WILDCARDS)
+	  & (FNM_PATHNAME | FNM_NOESCAPE | FNM_PERIOD | FNM_LEADING_DIR
+	     | FNM_CASEFOLD))
+	 == 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)
+	    ? strcasecmp (pattern, f)
+	    : strcmp (pattern, f));
+  else
+    {
+      size_t patlen = strlen (pattern);
+      int r = ((options & FNM_CASEFOLD)
+		? strncasecmp (pattern, f, patlen)
+		: strncmp (pattern, f, patlen));
+      if (! r)
+	{
+	  r = f[patlen];
+	  if (r == '/')
+	    r = 0;
+	}
+      return r;
+    }
+}
+
+/* Return true if EX excludes F.  */
+
+bool
+excluded_filename (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))
+	    {
+	      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);
+
+	      excluded ^= matched;
+	    }
+	}
+
+      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 FILENAME, 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 *filename, int options,
+		  char line_end)
+{
+  bool use_stdin = filename[0] == '-' && !filename[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 (filename, "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 (is_space (line_end))
+	  {
+	    for (; ; pattern_end--)
+	      if (pattern_end == pattern)
+		goto next_pattern;
+	      else if (! is_space (pattern_end[-1]))
+		break;
+	  }
+
+	*pattern_end = '\0';
+	(*add_func) (ex, pattern, options);
+
+      next_pattern:
+	pattern = p + 1;
+      }
+
+  errno = e;
+  return e ? -1 : 0;
+}