FreeBSD-5.3/usr.bin/tar/matching.c
/*-
* Copyright (c) 2003-2004 Tim Kientzle
* 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
* in this position and unchanged.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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 "bsdtar_platform.h"
__FBSDID("$FreeBSD: src/usr.bin/tar/matching.c,v 1.7 2004/07/24 22:13:44 kientzle Exp $");
#include <errno.h>
#include <fnmatch.h>
#include <stdlib.h>
#include <string.h>
#include "bsdtar.h"
struct match {
struct match *next;
int matches;
char pattern[1];
};
struct matching {
struct match *exclusions;
int exclusions_count;
struct match *inclusions;
int inclusions_count;
int inclusions_unmatched_count;
};
static void add_pattern(struct bsdtar *, struct match **list,
const char *pattern);
static void initialize_matching(struct bsdtar *);
static int match_exclusion(struct match *, const char *pathname);
static int match_inclusion(struct match *, const char *pathname);
/*
* The matching logic here needs to be re-thought. I started out to
* try to mimic gtar's matching logic, but it's not entirely
* consistent. In particular 'tar -t' and 'tar -x' interpret patterns
* on the command line as anchored, but --exclude doesn't.
*/
/*
* Utility functions to manage exclusion/inclusion patterns
*/
int
exclude(struct bsdtar *bsdtar, const char *pattern)
{
struct matching *matching;
if (bsdtar->matching == NULL)
initialize_matching(bsdtar);
matching = bsdtar->matching;
add_pattern(bsdtar, &(matching->exclusions), pattern);
matching->exclusions_count++;
return (0);
}
int
exclude_from_file(struct bsdtar *bsdtar, const char *pathname)
{
return (process_lines(bsdtar, pathname, &exclude));
}
int
include(struct bsdtar *bsdtar, const char *pattern)
{
struct matching *matching;
if (bsdtar->matching == NULL)
initialize_matching(bsdtar);
matching = bsdtar->matching;
add_pattern(bsdtar, &(matching->inclusions), pattern);
matching->inclusions_count++;
matching->inclusions_unmatched_count++;
return (0);
}
int
include_from_file(struct bsdtar *bsdtar, const char *pathname)
{
return (process_lines(bsdtar, pathname, &include));
}
static void
add_pattern(struct bsdtar *bsdtar, struct match **list, const char *pattern)
{
struct match *match;
match = malloc(sizeof(*match) + strlen(pattern) + 1);
if (match == NULL)
bsdtar_errc(bsdtar, 1, errno, "Out of memory");
if (pattern[0] == '/')
pattern++;
strcpy(match->pattern, pattern);
/* Both "foo/" and "foo" should match "foo/bar". */
if (match->pattern[strlen(match->pattern)-1] == '/')
match->pattern[strlen(match->pattern)-1] = '\0';
match->next = *list;
*list = match;
match->matches = 0;
}
int
excluded(struct bsdtar *bsdtar, const char *pathname)
{
struct matching *matching;
struct match *match;
struct match *matched;
matching = bsdtar->matching;
if (matching == NULL)
return (0);
/* Exclusions take priority */
for (match = matching->exclusions; match != NULL; match = match->next){
if (match_exclusion(match, pathname))
return (1);
}
/* Then check for inclusions */
matched = NULL;
for (match = matching->inclusions; match != NULL; match = match->next){
if (match_inclusion(match, pathname)) {
/*
* If this pattern has never been matched,
* then we're done.
*/
if (match->matches == 0) {
match->matches++;
matching->inclusions_unmatched_count++;
return (0);
}
/*
* Otherwise, remember the match but keep checking
* in case we can tick off an unmatched pattern.
*/
matched = match;
}
}
/*
* We didn't find a pattern that had never been matched, but
* we did find a match, so count it and exit.
*/
if (matched != NULL) {
matched->matches++;
return (0);
}
/* If there were inclusions, default is to exclude. */
if (matching->inclusions != NULL)
return (1);
/* No explicit inclusions, default is to match. */
return (0);
}
/*
* This is a little odd, but it matches the default behavior of
* gtar. In particular, 'a*b' will match 'foo/a1111/222b/bar'
*
* XXX TODO: fnmatch isn't the most portable thing around, and even
* worse, FNM_LEADING_DIR is a non-POSIX extension. <sigh> Thus, the
* following two functions need to eventually be replaced with code
* that does not rely on fnmatch().
*/
int
match_exclusion(struct match *match, const char *pathname)
{
const char *p;
if (*match->pattern == '*' || *match->pattern == '/')
return (fnmatch(match->pattern, pathname, FNM_LEADING_DIR) == 0);
for (p = pathname; p != NULL; p = strchr(p, '/')) {
if (*p == '/')
p++;
if (fnmatch(match->pattern, p, FNM_LEADING_DIR) == 0)
return (1);
}
return (0);
}
/*
* Again, mimic gtar: inclusions are always anchored (have to match
* the beginning of the path) even though exclusions are not anchored.
*/
int
match_inclusion(struct match *match, const char *pathname)
{
return (fnmatch(match->pattern, pathname, FNM_LEADING_DIR) == 0);
}
void
cleanup_exclusions(struct bsdtar *bsdtar)
{
struct match *p, *q;
if (bsdtar->matching) {
p = bsdtar->matching->inclusions;
while (p != NULL) {
q = p;
p = p->next;
free(q);
}
p = bsdtar->matching->exclusions;
while (p != NULL) {
q = p;
p = p->next;
free(q);
}
free(bsdtar->matching);
}
}
static void
initialize_matching(struct bsdtar *bsdtar)
{
bsdtar->matching = malloc(sizeof(*bsdtar->matching));
if (bsdtar->matching == NULL)
bsdtar_errc(bsdtar, 1, errno, "No memory");
memset(bsdtar->matching, 0, sizeof(*bsdtar->matching));
}
int
unmatched_inclusions(struct bsdtar *bsdtar)
{
struct matching *matching;
matching = bsdtar->matching;
if (matching == NULL)
return (0);
return (matching->inclusions_unmatched_count);
}