coreutils-8.25HEADcoreutils-8.25master

1 files changed, 77 insertions, 0 deletions

diff --git a/lib/hash-triple.c b/lib/hash-triple.c
new file mode 100644
index 0000000..008f90d
--- /dev/null
+++ b/lib/hash-triple.c
@@ -0,0 +1,77 @@
+/* Hash functions for file-related triples: name, device, inode.
+   Copyright (C) 2007, 2009-2016 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* written by Jim Meyering */
+
+#include <config.h>
+
+#include "hash-triple.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "hash-pjw.h"
+#include "same.h"
+#include "same-inode.h"
+
+#define STREQ(a, b) (strcmp (a, b) == 0)
+
+/* Hash an F_triple, and *do* consider the file name.  */
+size_t
+triple_hash (void const *x, size_t table_size)
+{
+  struct F_triple const *p = x;
+  size_t tmp = hash_pjw (p->name, table_size);
+
+  /* Ignoring the device number here should be fine.  */
+  return (tmp ^ p->st_ino) % table_size;
+}
+
+/* Hash an F_triple, without considering the file name.  */
+size_t
+triple_hash_no_name (void const *x, size_t table_size)
+{
+  struct F_triple const *p = x;
+
+  /* Ignoring the device number here should be fine.  */
+  return p->st_ino % table_size;
+}
+
+/* Compare two F_triple structs.  */
+bool
+triple_compare (void const *x, void const *y)
+{
+  struct F_triple const *a = x;
+  struct F_triple const *b = y;
+  return (SAME_INODE (*a, *b) && same_name (a->name, b->name)) ? true : false;
+}
+
+bool
+triple_compare_ino_str (void const *x, void const *y)
+{
+  struct F_triple const *a = x;
+  struct F_triple const *b = y;
+  return (SAME_INODE (*a, *b) && STREQ (a->name, b->name)) ? true : false;
+}
+
+/* Free an F_triple.  */
+void
+triple_free (void *x)
+{
+  struct F_triple *a = x;
+  free (a->name);
+  free (a);
+}