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