/usr.bin/xlint/lint2/hash.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 166 lines · 90 code · 24 blank · 52 comment · 24 complexity · 5cfd2dbcab0e7d48d2e7d09f7c756ca6 MD5 · raw file
- /* $NetBSD: hash.c,v 1.7 2002/01/21 19:49:52 tv Exp $ */
- /*
- * Copyright (c) 1994, 1995 Jochen Pohl
- * All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by Jochen Pohl for
- * The NetBSD Project.
- * 4. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include <sys/cdefs.h>
- #if defined(__RCSID) && !defined(lint)
- __RCSID("$NetBSD: hash.c,v 1.7 2002/01/21 19:49:52 tv Exp $");
- #endif
- __FBSDID("$FreeBSD$");
- /*
- * XXX Really need a generalized hash table package
- */
- #include <err.h>
- #include <limits.h>
- #include <stddef.h>
- #include <stdlib.h>
- #include <string.h>
- #include "lint2.h"
- /* pointer to hash table, initialized in inithash() */
- static hte_t **htab;
- static int hash(const char *);
- /*
- * Initialize hash table.
- */
- void
- _inithash(hte_t ***tablep)
- {
- if (tablep == NULL)
- tablep = &htab;
- *tablep = xcalloc(HSHSIZ2, sizeof (hte_t *));
- }
- /*
- * Compute hash value from a string.
- */
- static int
- hash(const char *s)
- {
- u_int v;
- const u_char *us;
- v = 0;
- for (us = (const u_char *)s; *us != '\0'; us++) {
- v = (v << sizeof (v)) + *us;
- v ^= v >> (sizeof (v) * CHAR_BIT - sizeof (v));
- }
- return (v % HSHSIZ2);
- }
- /*
- * Look for a hash table entry. If no hash table entry for the
- * given name exists and mknew is set, create a new one.
- */
- hte_t *
- _hsearch(hte_t **table, const char *s, int mknew)
- {
- int h;
- hte_t *hte;
- if (table == NULL)
- table = htab;
- h = hash(s);
- for (hte = table[h]; hte != NULL; hte = hte->h_link) {
- if (strcmp(hte->h_name, s) == 0)
- break;
- }
- if (hte != NULL || !mknew)
- return (hte);
- /* create a new hte */
- hte = xmalloc(sizeof (hte_t));
- hte->h_name = xstrdup(s);
- hte->h_used = 0;
- hte->h_def = 0;
- hte->h_static = 0;
- hte->h_syms = NULL;
- hte->h_lsym = &hte->h_syms;
- hte->h_calls = NULL;
- hte->h_lcall = &hte->h_calls;
- hte->h_usyms = NULL;
- hte->h_lusym = &hte->h_usyms;
- hte->h_link = table[h];
- hte->h_hte = NULL;
- table[h] = hte;
- return (hte);
- }
- /*
- * Call function f for each name in the hash table.
- */
- void
- _forall(hte_t **table, void (*f)(hte_t *))
- {
- int i;
- hte_t *hte;
- if (table == NULL)
- table = htab;
- for (i = 0; i < HSHSIZ2; i++) {
- for (hte = table[i]; hte != NULL; hte = hte->h_link)
- (*f)(hte);
- }
- }
- /*
- * Free all contents of the hash table that this module allocated.
- */
- void
- _destroyhash(hte_t **table)
- {
- int i;
- hte_t *hte, *nexthte;
- if (table == NULL)
- err(1, "_destroyhash called on main hash table");
- for (i = 0; i < HSHSIZ2; i++) {
- for (hte = table[i]; hte != NULL; hte = nexthte) {
- free((void *)hte->h_name);
- nexthte = hte->h_link;
- free(hte);
- }
- }
- free(table);
- }