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edd6bc7670
This version of mtree implements a new flag (-O) that can be used to restrict the tool to certain pathnames. Also, it fixes a compiler warning generated by -Wmissing-variable-declarations. Acked by: brooks
153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/* $NetBSD: only.c,v 1.2 2013/02/05 00:59:03 christos Exp $ */
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if defined(__RCSID) && !defined(lint)
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__RCSID("$NetBSD: only.c,v 1.2 2013/02/05 00:59:03 christos Exp $");
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#endif
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#include <sys/param.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <time.h>
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#include <err.h>
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#include <util.h>
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#include "extern.h"
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struct hentry {
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char *str;
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uint32_t hash;
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struct hentry *next;
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};
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static struct hentry *table[1024];
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static bool loaded;
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static uint32_t
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hash_str(const char *str)
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{
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const uint8_t *s = (const uint8_t *)str;
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uint8_t c;
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uint32_t hash = 0;
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while ((c = *s++) != '\0')
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hash = hash * 33 + c; /* "perl": k=33, r=r+r/32 */
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return hash + (hash >> 5);
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}
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static bool
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hash_find(const char *str, uint32_t *h)
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{
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struct hentry *e;
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*h = hash_str(str) % __arraycount(table);
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for (e = table[*h]; e; e = e->next)
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if (e->hash == *h && strcmp(e->str, str) == 0)
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return true;
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return false;
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}
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static void
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hash_insert(char *str, uint32_t h)
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{
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struct hentry *e;
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if ((e = malloc(sizeof(*e))) == NULL)
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mtree_err("memory allocation error");
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e->str = str;
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e->hash = h;
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e->next = table[h];
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table[h] = e;
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}
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static void
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fill(char *str)
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{
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uint32_t h;
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char *ptr = strrchr(str, '/');
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if (ptr == NULL)
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return;
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*ptr = '\0';
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if (!hash_find(str, &h)) {
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char *x = strdup(str);
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if (x == NULL)
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mtree_err("memory allocation error");
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hash_insert(x, h);
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fill(str);
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}
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*ptr = '/';
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}
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void
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load_only(const char *fname)
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{
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FILE *fp;
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char *line;
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size_t len, lineno;
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if ((fp = fopen(fname, "r")) == NULL)
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err(1, "Cannot open `%s'", fname);
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while ((line = fparseln(fp, &len, &lineno, NULL, FPARSELN_UNESCALL))) {
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uint32_t h;
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if (hash_find(line, &h))
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err(1, "Duplicate entry %s", line);
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hash_insert(line, h);
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fill(line);
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}
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fclose(fp);
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loaded = true;
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}
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bool
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find_only(const char *path)
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{
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uint32_t h;
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if (!loaded)
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return true;
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return hash_find(path, &h);
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}
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