minix/commands/tar/libarchive_fe/matching.c

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2010-07-13 21:28:09 +02:00
/*-
* Copyright (c) 2003-2007 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.
* 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 "lafe_platform.h"
__FBSDID("$FreeBSD: src/usr.bin/cpio/matching.c,v 1.2 2008/06/21 02:20:20 kientzle Exp $");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "err.h"
#include "line_reader.h"
#include "matching.h"
#include "pathmatch.h"
struct match {
struct match *next;
int matches;
char pattern[1];
};
struct lafe_matching {
struct match *exclusions;
int exclusions_count;
struct match *inclusions;
int inclusions_count;
int inclusions_unmatched_count;
};
static void add_pattern(struct match **list, const char *pattern);
static void initialize_matching(struct lafe_matching **);
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
lafe_exclude(struct lafe_matching **matching, const char *pattern)
{
if (*matching == NULL)
initialize_matching(matching);
add_pattern(&((*matching)->exclusions), pattern);
(*matching)->exclusions_count++;
return (0);
}
int
lafe_exclude_from_file(struct lafe_matching **matching, const char *pathname)
{
struct lafe_line_reader *lr;
const char *p;
int ret = 0;
lr = lafe_line_reader(pathname, 0);
while ((p = lafe_line_reader_next(lr)) != NULL) {
if (lafe_exclude(matching, p) != 0)
ret = -1;
}
lafe_line_reader_free(lr);
return (ret);
}
int
lafe_include(struct lafe_matching **matching, const char *pattern)
{
if (*matching == NULL)
initialize_matching(matching);
add_pattern(&((*matching)->inclusions), pattern);
(*matching)->inclusions_count++;
(*matching)->inclusions_unmatched_count++;
return (0);
}
int
lafe_include_from_file(struct lafe_matching **matching, const char *pathname,
int nullSeparator)
{
struct lafe_line_reader *lr;
const char *p;
int ret = 0;
lr = lafe_line_reader(pathname, nullSeparator);
while ((p = lafe_line_reader_next(lr)) != NULL) {
if (lafe_include(matching, p) != 0)
ret = -1;
}
lafe_line_reader_free(lr);
return (ret);
}
static void
add_pattern(struct match **list, const char *pattern)
{
struct match *match;
size_t len;
len = strlen(pattern);
match = malloc(sizeof(*match) + len + 1);
if (match == NULL)
lafe_errc(1, errno, "Out of memory");
strcpy(match->pattern, pattern);
/* Both "foo/" and "foo" should match "foo/bar". */
if (len && match->pattern[len - 1] == '/')
match->pattern[strlen(match->pattern)-1] = '\0';
match->next = *list;
*list = match;
match->matches = 0;
}
int
lafe_excluded(struct lafe_matching *matching, const char *pathname)
{
struct match *match;
struct match *matched;
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'
*
*/
static int
match_exclusion(struct match *match, const char *pathname)
{
return (lafe_pathmatch(match->pattern,
pathname,
PATHMATCH_NO_ANCHOR_START | PATHMATCH_NO_ANCHOR_END));
}
/*
* Again, mimic gtar: inclusions are always anchored (have to match
* the beginning of the path) even though exclusions are not anchored.
*/
static int
match_inclusion(struct match *match, const char *pathname)
{
#if 0
return (lafe_pathmatch(match->pattern, pathname, 0));
#else
return (lafe_pathmatch(match->pattern, pathname, PATHMATCH_NO_ANCHOR_END));
#endif
}
void
lafe_cleanup_exclusions(struct lafe_matching **matching)
{
struct match *p, *q;
if (*matching == NULL)
return;
for (p = (*matching)->inclusions; p != NULL; ) {
q = p;
p = p->next;
free(q);
}
for (p = (*matching)->exclusions; p != NULL; ) {
q = p;
p = p->next;
free(q);
}
free(*matching);
*matching = NULL;
}
static void
initialize_matching(struct lafe_matching **matching)
{
*matching = calloc(sizeof(**matching), 1);
if (*matching == NULL)
lafe_errc(1, errno, "No memory");
}
int
lafe_unmatched_inclusions(struct lafe_matching *matching)
{
if (matching == NULL)
return (0);
return (matching->inclusions_unmatched_count);
}
int
lafe_unmatched_inclusions_warn(struct lafe_matching *matching, const char *msg)
{
struct match *p;
if (matching == NULL)
return (0);
for (p = matching->inclusions; p != NULL; p = p->next) {
if (p->matches == 0)
lafe_warnc(0, "%s: %s", p->pattern, msg);
}
return (matching->inclusions_unmatched_count);
}