1 /* Hash functions for file-related triples: name, device, inode.
2 Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* written by Jim Meyering */
21 #include "hash-triple.h"
28 #include "same-inode.h"
30 #define STREQ(a, b) (strcmp (a, b) == 0)
32 /* The attribute __pure__ was added in gcc 2.96. */
33 #undef _GL_ATTRIBUTE_PURE
34 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
35 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
37 # define _GL_ATTRIBUTE_PURE /* empty */
40 /* Hash an F_triple, and *do* consider the file name. */
42 triple_hash (void const *x, size_t table_size)
44 struct F_triple const *p = x;
45 size_t tmp = hash_pjw (p->name, table_size);
47 /* Ignoring the device number here should be fine. */
48 return (tmp ^ p->st_ino) % table_size;
51 /* Hash an F_triple, without considering the file name. */
52 size_t _GL_ATTRIBUTE_PURE
53 triple_hash_no_name (void const *x, size_t table_size)
55 struct F_triple const *p = x;
57 /* Ignoring the device number here should be fine. */
58 return p->st_ino % table_size;
61 /* Compare two F_triple structs. */
63 triple_compare (void const *x, void const *y)
65 struct F_triple const *a = x;
66 struct F_triple const *b = y;
67 return (SAME_INODE (*a, *b) && same_name (a->name, b->name)) ? true : false;
71 triple_compare_ino_str (void const *x, void const *y)
73 struct F_triple const *a = x;
74 struct F_triple const *b = y;
75 return (SAME_INODE (*a, *b) && STREQ (a->name, b->name)) ? true : false;
78 /* Free an F_triple. */
82 struct F_triple *a = x;