1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Implementation of the symbol table type.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Author : Stephen Smalley, <sds@tycho.nsa.gov>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <linux/kernel.h>
8*4882a593Smuzhiyun #include <linux/string.h>
9*4882a593Smuzhiyun #include <linux/errno.h>
10*4882a593Smuzhiyun #include "symtab.h"
11*4882a593Smuzhiyun
symhash(const void * key)12*4882a593Smuzhiyun static unsigned int symhash(const void *key)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun const char *p, *keyp;
15*4882a593Smuzhiyun unsigned int size;
16*4882a593Smuzhiyun unsigned int val;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun val = 0;
19*4882a593Smuzhiyun keyp = key;
20*4882a593Smuzhiyun size = strlen(keyp);
21*4882a593Smuzhiyun for (p = keyp; (p - keyp) < size; p++)
22*4882a593Smuzhiyun val = (val << 4 | (val >> (8*sizeof(unsigned int)-4))) ^ (*p);
23*4882a593Smuzhiyun return val;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
symcmp(const void * key1,const void * key2)26*4882a593Smuzhiyun static int symcmp(const void *key1, const void *key2)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun const char *keyp1, *keyp2;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun keyp1 = key1;
31*4882a593Smuzhiyun keyp2 = key2;
32*4882a593Smuzhiyun return strcmp(keyp1, keyp2);
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun static const struct hashtab_key_params symtab_key_params = {
36*4882a593Smuzhiyun .hash = symhash,
37*4882a593Smuzhiyun .cmp = symcmp,
38*4882a593Smuzhiyun };
39*4882a593Smuzhiyun
symtab_init(struct symtab * s,unsigned int size)40*4882a593Smuzhiyun int symtab_init(struct symtab *s, unsigned int size)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun s->nprim = 0;
43*4882a593Smuzhiyun return hashtab_init(&s->table, size);
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
symtab_insert(struct symtab * s,char * name,void * datum)46*4882a593Smuzhiyun int symtab_insert(struct symtab *s, char *name, void *datum)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun return hashtab_insert(&s->table, name, datum, symtab_key_params);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
symtab_search(struct symtab * s,const char * name)51*4882a593Smuzhiyun void *symtab_search(struct symtab *s, const char *name)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun return hashtab_search(&s->table, name, symtab_key_params);
54*4882a593Smuzhiyun }
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