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(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
  26static 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
  36int 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