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	const char *p, *keyp;
16	unsigned int size;
17	unsigned int val;
18
19	val = 0;
20	keyp = key;
21	size = strlen(keyp);
22	for (p = keyp; (p - keyp) < size; p++)
23		val = (val << 4 | (val >> (8 * sizeof(unsigned int) - 4))) ^
24		      (*p);
25	return val;
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(&s->table, size);
46}
47
48int symtab_insert(struct symtab *s, char *name, void *datum)
49{
50	return hashtab_insert(&s->table, name, datum, symtab_key_params);
51}
52
53void *symtab_search(struct symtab *s, const char *name)
54{
55	return hashtab_search(&s->table, name, symtab_key_params);
56}