1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Implementation of the symbol table type.
4 *
5 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
6 */
7
8#include <linux/kernel.h>
9#include <linux/string.h>
10#include <linux/errno.h>
11#include "symtab.h"
12
13static unsigned int symhash(const void *key)
14{
15 /*
16 * djb2a
17 * Public domain from cdb v0.75
18 */
19 unsigned int hash = 5381;
20 unsigned char c;
21
22 while ((c = *(const unsigned char *)key++))
23 hash = ((hash << 5) + hash) ^ c;
24
25 return hash;
26}
27
28static int symcmp(const void *key1, const void *key2)
29{
30 const char *keyp1, *keyp2;
31
32 keyp1 = key1;
33 keyp2 = key2;
34 return strcmp(keyp1, keyp2);
35}
36
37static const struct hashtab_key_params symtab_key_params = {
38 .hash = symhash,
39 .cmp = symcmp,
40};
41
42int symtab_init(struct symtab *s, u32 size)
43{
44 s->nprim = 0;
45 return hashtab_init(h: &s->table, nel_hint: size);
46}
47
48int symtab_insert(struct symtab *s, char *name, void *datum)
49{
50 return hashtab_insert(h: &s->table, key: name, datum, key_params: symtab_key_params);
51}
52
53void *symtab_search(struct symtab *s, const char *name)
54{
55 return hashtab_search(h: &s->table, key: name, key_params: symtab_key_params);
56}
57