symtab.c

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/*
 * Implementation of the symbol table type.
 *
 * Author : Stephen Smalley, <[email protected]>
 */
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include "symtab.h"

static unsigned int symhash(struct hashtab *h, const void *key)
{
    const char *p, *keyp;
    unsigned int size;
    unsigned int val;

    val = 0;
    keyp = key;
    size = strlen(keyp);
    for (p = keyp; (p - keyp) < size; p++)
        val = (val << 4 | (val >> (8*sizeof(unsigned int)-4))) ^ (*p);
    return val & (h->size - 1);
}

static int symcmp(struct hashtab *h, const void *key1, const void *key2)
{
    const char *keyp1, *keyp2;

    keyp1 = key1;
    keyp2 = key2;
    return strcmp(keyp1, keyp2);
}


int symtab_init(struct symtab *s, unsigned int size)
{
    s->table = hashtab_create(symhash, symcmp, size);
    if (!s->table)
        return -ENOMEM;
    s->nprim = 0;
    return 0;
}