-/***
- This file is part of systemd.
+/* SPDX-License-Identifier: LGPL-2.1+ */
- Copyright 2010 Lennart Poettering
- Copyright 2014 Michal Schmidt
+#include <string.h>
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
+#include "hash-funcs.h"
+#include "path-util.h"
- systemd 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
- Lesser General Public License for more details.
+void string_hash_func(const char *p, struct siphash *state) {
+ siphash24_compress(p, strlen(p) + 1, state);
+}
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
+DEFINE_HASH_OPS(string_hash_ops, char, string_hash_func, string_compare_func);
-#include "hash-funcs.h"
+void path_hash_func(const char *q, struct siphash *state) {
+ size_t n;
-void string_hash_func(const void *p, struct siphash *state) {
- siphash24_compress(p, strlen(p) + 1, state);
+ assert(q);
+ assert(state);
+
+ /* Calculates a hash for a path in a way this duplicate inner slashes don't make a differences, and also
+ * whether there's a trailing slash or not. This fits well with the semantics of path_compare(), which does
+ * similar checks and also doesn't care for trailing slashes. Note that relative and absolute paths (i.e. those
+ * which begin in a slash or not) will hash differently though. */
+
+ n = strspn(q, "/");
+ if (n > 0) { /* Eat up initial slashes, and add one "/" to the hash for all of them */
+ siphash24_compress(q, 1, state);
+ q += n;
+ }
+
+ for (;;) {
+ /* Determine length of next component */
+ n = strcspn(q, "/");
+ if (n == 0) /* Reached the end? */
+ break;
+
+ /* Add this component to the hash and skip over it */
+ siphash24_compress(q, n, state);
+ q += n;
+
+ /* How many slashes follow this component? */
+ n = strspn(q, "/");
+ if (q[n] == 0) /* Is this a trailing slash? If so, we are at the end, and don't care about the slashes anymore */
+ break;
+
+ /* We are not add the end yet. Hash exactly one slash for all of the ones we just encountered. */
+ siphash24_compress(q, 1, state);
+ q += n;
+ }
}
-int string_compare_func(const void *a, const void *b) {
- return strcmp(a, b);
+int path_compare_func(const char *a, const char *b) {
+ return path_compare(a, b);
}
-const struct hash_ops string_hash_ops = {
- .hash = string_hash_func,
- .compare = string_compare_func
-};
+DEFINE_HASH_OPS(path_hash_ops, char, path_hash_func, path_compare_func);
void trivial_hash_func(const void *p, struct siphash *state) {
siphash24_compress(&p, sizeof(p), state);
}
int trivial_compare_func(const void *a, const void *b) {
- return a < b ? -1 : (a > b ? 1 : 0);
+ return CMP(a, b);
}
const struct hash_ops trivial_hash_ops = {
.hash = trivial_hash_func,
- .compare = trivial_compare_func
+ .compare = trivial_compare_func,
};
-void uint64_hash_func(const void *p, struct siphash *state) {
+void uint64_hash_func(const uint64_t *p, struct siphash *state) {
siphash24_compress(p, sizeof(uint64_t), state);
}
-int uint64_compare_func(const void *_a, const void *_b) {
- uint64_t a, b;
- a = *(const uint64_t*) _a;
- b = *(const uint64_t*) _b;
- return a < b ? -1 : (a > b ? 1 : 0);
+int uint64_compare_func(const uint64_t *a, const uint64_t *b) {
+ return CMP(*a, *b);
}
-const struct hash_ops uint64_hash_ops = {
- .hash = uint64_hash_func,
- .compare = uint64_compare_func
-};
+DEFINE_HASH_OPS(uint64_hash_ops, uint64_t, uint64_hash_func, uint64_compare_func);
#if SIZEOF_DEV_T != 8
-void devt_hash_func(const void *p, struct siphash *state) {
+void devt_hash_func(const dev_t *p, struct siphash *state) {
siphash24_compress(p, sizeof(dev_t), state);
}
-int devt_compare_func(const void *_a, const void *_b) {
- dev_t a, b;
- a = *(const dev_t*) _a;
- b = *(const dev_t*) _b;
- return a < b ? -1 : (a > b ? 1 : 0);
+int devt_compare_func(const dev_t *a, const dev_t *b) {
+ return CMP(*a, *b);
}
-const struct hash_ops devt_hash_ops = {
- .hash = devt_hash_func,
- .compare = devt_compare_func
-};
+DEFINE_HASH_OPS(devt_hash_ops, dev_t, devt_hash_func, devt_compare_func);
#endif