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417 lines
11 KiB
C
417 lines
11 KiB
C
/*-
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* Copyright (c) 2003-2004 Tim Kientzle
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* All rights reserved.
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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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* in this position and unchanged.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "bsdtar_platform.h"
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "bsdtar.h"
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struct match {
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struct match *next;
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int matches;
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char pattern[1];
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};
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struct matching {
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struct match *exclusions;
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int exclusions_count;
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struct match *inclusions;
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int inclusions_count;
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int inclusions_unmatched_count;
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};
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static void add_pattern(struct bsdtar *, struct match **list,
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const char *pattern);
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static int bsdtar_fnmatch(const char *p, const char *s);
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static void initialize_matching(struct bsdtar *);
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static int match_exclusion(struct match *, const char *pathname);
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static int match_inclusion(struct match *, const char *pathname);
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/*
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* The matching logic here needs to be re-thought. I started out to
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* try to mimic gtar's matching logic, but it's not entirely
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* consistent. In particular 'tar -t' and 'tar -x' interpret patterns
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* on the command line as anchored, but --exclude doesn't.
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*/
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/*
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* Utility functions to manage exclusion/inclusion patterns
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*/
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int
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exclude(struct bsdtar *bsdtar, const char *pattern)
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{
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struct matching *matching;
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if (bsdtar->matching == NULL)
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initialize_matching(bsdtar);
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matching = bsdtar->matching;
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add_pattern(bsdtar, &(matching->exclusions), pattern);
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matching->exclusions_count++;
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return (0);
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}
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int
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exclude_from_file(struct bsdtar *bsdtar, const char *pathname)
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{
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return (process_lines(bsdtar, pathname, &exclude));
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}
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int
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include(struct bsdtar *bsdtar, const char *pattern)
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{
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struct matching *matching;
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if (bsdtar->matching == NULL)
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initialize_matching(bsdtar);
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matching = bsdtar->matching;
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add_pattern(bsdtar, &(matching->inclusions), pattern);
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matching->inclusions_count++;
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matching->inclusions_unmatched_count++;
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return (0);
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}
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int
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include_from_file(struct bsdtar *bsdtar, const char *pathname)
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{
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return (process_lines(bsdtar, pathname, &include));
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}
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static void
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add_pattern(struct bsdtar *bsdtar, struct match **list, const char *pattern)
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{
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struct match *match;
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match = malloc(sizeof(*match) + strlen(pattern) + 1);
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if (match == NULL)
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bsdtar_errc(bsdtar, 1, errno, "Out of memory");
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if (pattern[0] == '/')
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pattern++;
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strcpy(match->pattern, pattern);
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/* Both "foo/" and "foo" should match "foo/bar". */
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if (match->pattern[strlen(match->pattern)-1] == '/')
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match->pattern[strlen(match->pattern)-1] = '\0';
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match->next = *list;
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*list = match;
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match->matches = 0;
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}
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int
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excluded(struct bsdtar *bsdtar, const char *pathname)
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{
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struct matching *matching;
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struct match *match;
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struct match *matched;
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matching = bsdtar->matching;
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if (matching == NULL)
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return (0);
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/* Exclusions take priority */
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for (match = matching->exclusions; match != NULL; match = match->next){
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if (match_exclusion(match, pathname))
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return (1);
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}
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/* Then check for inclusions */
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matched = NULL;
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for (match = matching->inclusions; match != NULL; match = match->next){
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if (match_inclusion(match, pathname)) {
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/*
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* If this pattern has never been matched,
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* then we're done.
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*/
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if (match->matches == 0) {
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match->matches++;
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matching->inclusions_unmatched_count++;
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return (0);
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}
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/*
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* Otherwise, remember the match but keep checking
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* in case we can tick off an unmatched pattern.
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*/
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matched = match;
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}
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}
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/*
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* We didn't find a pattern that had never been matched, but
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* we did find a match, so count it and exit.
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*/
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if (matched != NULL) {
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matched->matches++;
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return (0);
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}
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/* If there were inclusions, default is to exclude. */
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if (matching->inclusions != NULL)
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return (1);
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/* No explicit inclusions, default is to match. */
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return (0);
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}
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/*
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* This is a little odd, but it matches the default behavior of
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* gtar. In particular, 'a*b' will match 'foo/a1111/222b/bar'
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*
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*/
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int
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match_exclusion(struct match *match, const char *pathname)
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{
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const char *p;
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if (*match->pattern == '*' || *match->pattern == '/')
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return (bsdtar_fnmatch(match->pattern, pathname) == 0);
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for (p = pathname; p != NULL; p = strchr(p, '/')) {
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if (*p == '/')
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p++;
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if (bsdtar_fnmatch(match->pattern, p) == 0)
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return (1);
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}
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return (0);
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}
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/*
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* Again, mimic gtar: inclusions are always anchored (have to match
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* the beginning of the path) even though exclusions are not anchored.
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*/
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int
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match_inclusion(struct match *match, const char *pathname)
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{
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return (bsdtar_fnmatch(match->pattern, pathname) == 0);
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}
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void
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cleanup_exclusions(struct bsdtar *bsdtar)
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{
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struct match *p, *q;
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if (bsdtar->matching) {
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p = bsdtar->matching->inclusions;
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while (p != NULL) {
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q = p;
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p = p->next;
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free(q);
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}
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p = bsdtar->matching->exclusions;
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while (p != NULL) {
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q = p;
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p = p->next;
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free(q);
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}
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free(bsdtar->matching);
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}
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}
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static void
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initialize_matching(struct bsdtar *bsdtar)
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{
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bsdtar->matching = malloc(sizeof(*bsdtar->matching));
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if (bsdtar->matching == NULL)
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bsdtar_errc(bsdtar, 1, errno, "No memory");
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memset(bsdtar->matching, 0, sizeof(*bsdtar->matching));
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}
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int
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unmatched_inclusions(struct bsdtar *bsdtar)
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{
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struct matching *matching;
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matching = bsdtar->matching;
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if (matching == NULL)
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return (0);
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return (matching->inclusions_unmatched_count);
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}
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#if defined(HAVE_FNMATCH) && defined(HAVE_FNM_LEADING_DIR)
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/* Use system fnmatch() if it suits our needs. */
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/* On Linux, _GNU_SOURCE must be defined to get FNM_LEADING_DIR. */
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#define _GNU_SOURCE
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#include <fnmatch.h>
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static int
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bsdtar_fnmatch(const char *pattern, const char *string)
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{
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return (fnmatch(pattern, string, FNM_LEADING_DIR));
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}
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#else
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/*
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* The following was hacked from BSD C library
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* code: src/lib/libc/gen/fnmatch.c,v 1.15 2002/02/01
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*
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* In particular, most of the flags were ripped out: this always
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* behaves like FNM_LEADING_DIR is set and other flags specified
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* by POSIX are unset.
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*
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* Normally, I would not conditionally compile something like this: If
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* I have to support it anyway, everyone may as well use it. ;-)
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* However, the full POSIX spec for fnmatch() includes a lot of
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* advanced character handling that I'm not ready to put in here, so
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* it's probably best if people use a local version when it's available.
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*/
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/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Guido van Rossum.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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static int
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bsdtar_fnmatch(const char *pattern, const char *string)
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{
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const char *saved_pattern;
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int negate, matched;
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char c;
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for (;;) {
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switch (c = *pattern++) {
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case '\0':
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if (*string == '/' || *string == '\0')
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return (0);
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return (1);
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case '?':
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if (*string == '\0')
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return (1);
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++string;
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break;
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case '*':
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c = *pattern;
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/* Collapse multiple stars. */
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while (c == '*')
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c = *++pattern;
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/* Optimize for pattern with * at end. */
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if (c == '\0')
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return (0);
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/* General case, use recursion. */
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while (*string != '\0') {
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if (!bsdtar_fnmatch(pattern, string))
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return (0);
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++string;
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}
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return (1);
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case '[':
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if (*string == '\0')
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return (1);
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saved_pattern = pattern;
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if (*pattern == '!' || *pattern == '^') {
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negate = 1;
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++pattern;
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} else
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negate = 0;
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matched = 0;
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c = *pattern++;
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do {
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if (c == '\\')
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c = *pattern++;
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if (c == '\0') {
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pattern = saved_pattern;
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c = '[';
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goto norm;
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}
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if (*pattern == '-') {
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char c2 = *(pattern + 1);
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if (c2 == '\0') {
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pattern = saved_pattern;
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c = '[';
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goto norm;
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}
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if (c2 == ']') {
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/* [a-] is not a range. */
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if (c == *string
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|| '-' == *string)
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matched = 1;
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pattern ++;
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} else {
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if (c <= *string
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&& *string <= c2)
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matched = 1;
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pattern += 2;
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}
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} else if (c == *string)
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matched = 1;
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c = *pattern++;
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} while (c != ']');
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if (matched == negate)
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return (1);
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++string;
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break;
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case '\\':
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if ((c = *pattern++) == '\0') {
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c = '\\';
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--pattern;
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}
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/* FALLTHROUGH */
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default:
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norm:
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if (c != *string)
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return (1);
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string++;
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break;
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}
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}
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/* NOTREACHED */
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}
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#endif
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