LXR linux/security/selinux/ss/symtab.c

   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
  12static 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
  26static 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
  35static const struct hashtab_key_params symtab_key_params = {
  36        .hash = symhash,
  37        .cmp = symcmp,
  38};
  39
  40int symtab_init(struct symtab *s, unsigned int size)
  41{
  42        s->nprim = 0;
  43        return hashtab_init(&s->table, size);
  44}
  45
  46int symtab_insert(struct symtab *s, char *name, void *datum)
  47{
  48        return hashtab_insert(&s->table, name, datum, symtab_key_params);
  49}
  50
  51void *symtab_search(struct symtab *s, const char *name)
  52{
  53        return hashtab_search(&s->table, name, symtab_key_params);
  54}
  55