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(struct hashtab * h,const void * key)12 static unsigned int symhash(struct hashtab *h, 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 & (h->size - 1);
24 }
25
symcmp(struct hashtab * h,const void * key1,const void * key2)26 static int symcmp(struct hashtab *h, 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
symtab_init(struct symtab * s,unsigned int size)36 int symtab_init(struct symtab *s, unsigned int size)
37 {
38 s->table = hashtab_create(symhash, symcmp, size);
39 if (!s->table)
40 return -ENOMEM;
41 s->nprim = 0;
42 return 0;
43 }
44
45