78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
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/* Hash functions for file-related triples: name, device, inode.
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Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* written by Jim Meyering */
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#include <config.h>
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#include "hash-triple.h"
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#include <stdlib.h>
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#include <string.h>
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#include "hash-pjw.h"
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#include "same.h"
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#include "same-inode.h"
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#define STREQ(a, b) (strcmp (a, b) == 0)
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/* Hash an F_triple, and *do* consider the file name. */
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size_t
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triple_hash (void const *x, size_t table_size)
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{
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struct F_triple const *p = x;
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size_t tmp = hash_pjw (p->name, table_size);
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/* Ignoring the device number here should be fine. */
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return (tmp ^ p->st_ino) % table_size;
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}
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/* Hash an F_triple, without considering the file name. */
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size_t
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triple_hash_no_name (void const *x, size_t table_size)
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{
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struct F_triple const *p = x;
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/* Ignoring the device number here should be fine. */
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return p->st_ino % table_size;
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}
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/* Compare two F_triple structs. */
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bool
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triple_compare (void const *x, void const *y)
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{
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struct F_triple const *a = x;
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struct F_triple const *b = y;
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return (SAME_INODE (*a, *b) && same_name (a->name, b->name)) ? true : false;
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}
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bool
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triple_compare_ino_str (void const *x, void const *y)
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{
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struct F_triple const *a = x;
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struct F_triple const *b = y;
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return (SAME_INODE (*a, *b) && STREQ (a->name, b->name)) ? true : false;
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}
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/* Free an F_triple. */
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void
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triple_free (void *x)
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{
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struct F_triple *a = x;
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free (a->name);
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free (a);
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}
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