+
+/* Return nonzero if file NAME is excluded. */
+bool
+excluded_name (char const *name)
+{
+ return excluded_filename (excluded, name + FILESYSTEM_PREFIX_LEN (name));
+}
+\f
+/* Hash tables of strings. */
+
+/* Calculate the hash of a string. */
+static unsigned
+hash_string_hasher (void const *name, unsigned n_buckets)
+{
+ return hash_string (name, n_buckets);
+}
+
+/* Compare two strings for equality. */
+static bool
+hash_string_compare (void const *name1, void const *name2)
+{
+ return strcmp (name1, name2) == 0;
+}
+
+/* Return zero if TABLE contains a copy of STRING; otherwise, insert a
+ copy of STRING to TABLE and return 1. */
+static bool
+hash_string_insert (Hash_table **table, char const *string)
+{
+ Hash_table *t = *table;
+ char *s = xstrdup (string);
+ char *e;
+
+ if (! ((t
+ || (*table = t = hash_initialize (0, 0, hash_string_hasher,
+ hash_string_compare, 0)))
+ && (e = hash_insert (t, s))))
+ xalloc_die ();
+
+ if (e == s)
+ return 1;
+ else
+ {
+ free (s);
+ return 0;
+ }
+}
+
+/* Return 1 if TABLE contains STRING. */
+static bool
+hash_string_lookup (Hash_table const *table, char const *string)
+{
+ return table && hash_lookup (table, string);
+}
+\f
+/* Names to avoid dumping. */
+static Hash_table *avoided_name_table;
+
+/* Remember to not archive NAME. */
+void
+add_avoided_name (char const *name)
+{
+ hash_string_insert (&avoided_name_table, name);
+}
+
+/* Should NAME be avoided when archiving? */
+bool
+is_avoided_name (char const *name)
+{
+ return hash_string_lookup (avoided_name_table, name);
+}
+\f
+/* Return a safer suffix of FILE_NAME, or "." if it has no safer
+ suffix. Check for fully specified file names and other atrocities.
+ Warn the user if we do not return NAME. If LINK_TARGET is 1,
+ FILE_NAME is the target of a hard link, not a member name. */
+
+char *
+safer_name_suffix (char const *file_name, bool link_target)
+{
+ char const *p;
+
+ if (absolute_names_option)
+ p = file_name;
+ else
+ {
+ /* Skip file system prefixes, leading pathnames that contain
+ "..", and leading slashes. */
+
+ size_t prefix_len = FILESYSTEM_PREFIX_LEN (file_name);
+
+ for (p = file_name + prefix_len; *p; )
+ {
+ if (p[0] == '.' && p[1] == '.' && (ISSLASH (p[2]) || !p[2]))
+ prefix_len = p + 2 - file_name;
+
+ do
+ {
+ char c = *p++;
+ if (ISSLASH (c))
+ break;
+ }
+ while (*p);
+ }
+
+ for (p = file_name + prefix_len; ISSLASH (*p); p++)
+ continue;
+ prefix_len = p - file_name;
+
+ if (prefix_len)
+ {
+ static Hash_table *prefix_table[2];
+ char *prefix = alloca (prefix_len + 1);
+ memcpy (prefix, file_name, prefix_len);
+ prefix[prefix_len] = '\0';
+
+ if (hash_string_insert (&prefix_table[link_target], prefix))
+ {
+ static char const *const diagnostic[] =
+ {
+ N_("Removing leading `%s' from member names"),
+ N_("Removing leading `%s' from hard link targets")
+ };
+ WARN ((0, 0, _(diagnostic[link_target]), prefix));
+ }
+ }
+ }
+
+ if (! *p)
+ {
+ if (p == file_name)
+ {
+ static char const *const diagnostic[] =
+ {
+ N_("Substituting `.' for empty member name"),
+ N_("Substituting `.' for empty hard link target")
+ };
+ WARN ((0, 0, _(diagnostic[link_target])));
+ }
+
+ p = ".";
+ }
+
+ return (char *) p;
+}
+\f
+/* Return nonzero if NAME contains ".." as a path name component. */
+bool
+contains_dot_dot (char const *name)
+{
+ char const *p = name + FILESYSTEM_PREFIX_LEN (name);
+
+ for (;; p++)
+ {
+ if (p[0] == '.' && p[1] == '.' && (ISSLASH (p[2]) || !p[2]))
+ return 1;
+
+ do
+ {
+ if (! *p++)
+ return 0;
+ }
+ while (! ISSLASH (*p));
+ }
+}