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
symhash(const void * key)13 static 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
symcmp(const void * key1,const void * key2)28 static 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
37 static const struct hashtab_key_params symtab_key_params = {
38 .hash = symhash,
39 .cmp = symcmp,
40 };
41
symtab_init(struct symtab * s,u32 size)42 int symtab_init(struct symtab *s, u32 size)
43 {
44 s->nprim = 0;
45 return hashtab_init(&s->table, size);
46 }
47
symtab_insert(struct symtab * s,char * name,void * datum)48 int symtab_insert(struct symtab *s, char *name, void *datum)
49 {
50 return hashtab_insert(&s->table, name, datum, symtab_key_params);
51 }
52
symtab_search(struct symtab * s,const char * name)53 void *symtab_search(struct symtab *s, const char *name)
54 {
55 return hashtab_search(&s->table, name, symtab_key_params);
56 }
57