tar/read.c - third_party/libarchive - Git at Google

 /*-
  * 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 "bsdtar_platform.h"
 __FBSDID("$FreeBSD: src/usr.bin/tar/read.c,v 1.40 2008/08/21 06:41:14 kientzle Exp $");

 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
 #endif
 #ifdef HAVE_SYS_STAT_H
 #include <sys/stat.h>
 #endif

 #ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
 #ifdef HAVE_GRP_H
 #include <grp.h>
 #endif
 #ifdef HAVE_LIMITS_H
 #include <limits.h>
 #endif
 #ifdef HAVE_PWD_H
 #include <pwd.h>
 #endif
 #ifdef HAVE_STDINT_H
 #include <stdint.h>
 #endif
 #include <stdio.h>
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>
 #endif
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif
 #ifdef HAVE_TIME_H
 #include <time.h>
 #endif
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif

 #include "bsdtar.h"
 #include "err.h"

 struct progress_data {
 	struct bsdtar *bsdtar;
 	struct archive *archive;
 	struct archive_entry *entry;
 };

 static void	list_item_verbose(struct bsdtar *, FILE *,
 		    struct archive_entry *);
 static void	read_archive(struct bsdtar *bsdtar, char mode, struct archive *);
 static int unmatched_inclusions_warn(struct archive *matching, const char *);


 void
 tar_mode_t(struct bsdtar *bsdtar)
 {
 	read_archive(bsdtar, 't', NULL);
 	if (unmatched_inclusions_warn(bsdtar->matching,
 	    "Not found in archive") != 0)
 		bsdtar->return_value = 1;
 }

 void
 tar_mode_x(struct bsdtar *bsdtar)
 {
 	struct archive *writer;

 	writer = archive_write_disk_new();
 	if (writer == NULL)
 		lafe_errc(1, ENOMEM, "Cannot allocate disk writer object");
 	if (!bsdtar->option_numeric_owner)
 		archive_write_disk_set_standard_lookup(writer);
 	archive_write_disk_set_options(writer, bsdtar->extract_flags);

 	read_archive(bsdtar, 'x', writer);

 	if (unmatched_inclusions_warn(bsdtar->matching,
 	    "Not found in archive") != 0)
 		bsdtar->return_value = 1;
 	archive_write_free(writer);
 }

 static void
 progress_func(void *cookie)
 {
 	struct progress_data *progress_data = cookie;
 	struct bsdtar *bsdtar = progress_data->bsdtar;
 	struct archive *a = progress_data->archive;
 	struct archive_entry *entry = progress_data->entry;
 	uint64_t comp, uncomp;
 	int compression;

 	if (!need_report())
 		return;

 	if (bsdtar->verbose)
 		fprintf(stderr, "\n");
 	if (a != NULL) {
 		comp = archive_filter_bytes(a, -1);
 		uncomp = archive_filter_bytes(a, 0);
 		if (comp > uncomp)
 			compression = 0;
 		else
 			compression = (int)((uncomp - comp) * 100 / uncomp);
 		fprintf(stderr,
 		    "In: %s bytes, compression %d%%;",
 		    tar_i64toa(comp), compression);
 		fprintf(stderr, "  Out: %d files, %s bytes\n",
 		    archive_file_count(a), tar_i64toa(uncomp));
 	}
 	if (entry != NULL) {
 		safe_fprintf(stderr, "Current: %s",
 		    archive_entry_pathname(entry));
 		fprintf(stderr, " (%s bytes)\n",
 		    tar_i64toa(archive_entry_size(entry)));
 	}
 }

 /*
  * Handle 'x' and 't' modes.
  */
 static void
 read_archive(struct bsdtar *bsdtar, char mode, struct archive *writer)
 {
 	struct progress_data	progress_data;
 	FILE			 *out;
 	struct archive		 *a;
 	struct archive_entry	 *entry;
 	const char		 *reader_options;
 	int			  r;

 	while (*bsdtar->argv) {
 		if (archive_match_include_pattern(bsdtar->matching,
 		    *bsdtar->argv) != ARCHIVE_OK)
 			lafe_errc(1, 0, "Error inclusion pattern: %s",
 			    archive_error_string(bsdtar->matching));
 		bsdtar->argv++;
 	}

 	if (bsdtar->names_from_file != NULL)
 		if (archive_match_include_pattern_from_file(
 		    bsdtar->matching, bsdtar->names_from_file,
 		    bsdtar->option_null) != ARCHIVE_OK)
 			lafe_errc(1, 0, "Error inclusion pattern: %s",
 			    archive_error_string(bsdtar->matching));

 	a = archive_read_new();
 	if (cset_read_support_filter_program(bsdtar->cset, a) == 0)
 		archive_read_support_filter_all(a);
 	archive_read_support_format_all(a);

 	reader_options = getenv(ENV_READER_OPTIONS);
 	if (reader_options != NULL) {
 		char *p;
 		/* Set default read options. */
 		p = malloc(sizeof(IGNORE_WRONG_MODULE_NAME)
 		    + strlen(reader_options) + 1);
 		if (p == NULL)
 			lafe_errc(1, errno, "Out of memory");
 		/* Prepend magic code to ignore options for
 		 * a format or  modules which are not added to
 		 *  the archive read object. */
 		strncpy(p, IGNORE_WRONG_MODULE_NAME,
 		    sizeof(IGNORE_WRONG_MODULE_NAME) -1);
 		strcpy(p + sizeof(IGNORE_WRONG_MODULE_NAME) -1, reader_options);
 		r = archive_read_set_options(a, p);
 		free(p);
 		if (r == ARCHIVE_FATAL)
 			lafe_errc(1, 0, "%s", archive_error_string(a));
 		else
 			archive_clear_error(a);
 	}
 	if (ARCHIVE_OK != archive_read_set_options(a, bsdtar->option_options))
 		lafe_errc(1, 0, "%s", archive_error_string(a));
 	if (archive_read_open_filename(a, bsdtar->filename,
 					bsdtar->bytes_per_block))
 		lafe_errc(1, 0, "Error opening archive: %s",
 		    archive_error_string(a));

 	do_chdir(bsdtar);

 	if (mode == 'x') {
 		/* Set an extract callback so that we can handle SIGINFO. */
 		progress_data.bsdtar = bsdtar;
 		progress_data.archive = a;
 		archive_read_extract_set_progress_callback(a, progress_func,
 		    &progress_data);
 	}

 	if (mode == 'x' && bsdtar->option_chroot) {
 #if HAVE_CHROOT
 		if (chroot(".") != 0)
 			lafe_errc(1, errno, "Can't chroot to \".\"");
 #else
 		lafe_errc(1, 0,
 		    "chroot isn't supported on this platform");
 #endif
 	}

 	for (;;) {
 		/* Support --fast-read option */
 		if (bsdtar->option_fast_read &&
 		    archive_match_path_unmatched_inclusions(bsdtar->matching) == 0)
 			break;

 		r = archive_read_next_header(a, &entry);
 		progress_data.entry = entry;
 		if (r == ARCHIVE_EOF)
 			break;
 		if (r < ARCHIVE_OK)
 			lafe_warnc(0, "%s", archive_error_string(a));
 		if (r <= ARCHIVE_WARN)
 			bsdtar->return_value = 1;
 		if (r == ARCHIVE_RETRY) {
 			/* Retryable error: try again */
 			lafe_warnc(0, "Retrying...");
 			continue;
 		}
 		if (r == ARCHIVE_FATAL)
 			break;

 		if (bsdtar->uid >= 0) {
 			archive_entry_set_uid(entry, bsdtar->uid);
 			archive_entry_set_uname(entry, NULL);
 		}
 		if (bsdtar->gid >= 0) {
 			archive_entry_set_gid(entry, bsdtar->gid);
 			archive_entry_set_gname(entry, NULL);
 		}
 		if (bsdtar->uname)
 			archive_entry_set_uname(entry, bsdtar->uname);
 		if (bsdtar->gname)
 			archive_entry_set_gname(entry, bsdtar->gname);

 		/*
 		 * Note that pattern exclusions are checked before
 		 * pathname rewrites are handled.  This gives more
 		 * control over exclusions, since rewrites always lose
 		 * information.  (For example, consider a rewrite
 		 * s/foo[0-9]/foo/.  If we check exclusions after the
 		 * rewrite, there would be no way to exclude foo1/bar
 		 * while allowing foo2/bar.)
 		 */
 		if (archive_match_excluded(bsdtar->matching, entry))
 			continue; /* Excluded by a pattern test. */

 		if (mode == 't') {
 			/* Perversely, gtar uses -O to mean "send to stderr"
 			 * when used with -t. */
 			out = bsdtar->option_stdout ? stderr : stdout;

 			/*
 			 * TODO: Provide some reasonable way to
 			 * preview rewrites.  gtar always displays
 			 * the unedited path in -t output, which means
 			 * you cannot easily preview rewrites.
 			 */
 			if (bsdtar->verbose < 2)
 				safe_fprintf(out, "%s",
 				    archive_entry_pathname(entry));
 			else
 				list_item_verbose(bsdtar, out, entry);
 			fflush(out);
 			r = archive_read_data_skip(a);
 			if (r == ARCHIVE_WARN) {
 				fprintf(out, "\n");
 				lafe_warnc(0, "%s",
 				    archive_error_string(a));
 			}
 			if (r == ARCHIVE_RETRY) {
 				fprintf(out, "\n");
 				lafe_warnc(0, "%s",
 				    archive_error_string(a));
 			}
 			if (r == ARCHIVE_FATAL) {
 				fprintf(out, "\n");
 				lafe_warnc(0, "%s",
 				    archive_error_string(a));
 				bsdtar->return_value = 1;
 				break;
 			}
 			fprintf(out, "\n");
 		} else {
 			/* Note: some rewrite failures prevent extraction. */
 			if (edit_pathname(bsdtar, entry))
 				continue; /* Excluded by a rewrite failure. */

 			if (bsdtar->option_interactive &&
 			    !yes("extract '%s'", archive_entry_pathname(entry)))
 				continue;

 			/*
 			 * Format here is from SUSv2, including the
 			 * deferred '\n'.
 			 */
 			if (bsdtar->verbose) {
 				safe_fprintf(stderr, "x %s",
 				    archive_entry_pathname(entry));
 				fflush(stderr);
 			}

 			/* TODO siginfo_printinfo(bsdtar, 0); */

 			if (bsdtar->option_stdout)
 				r = archive_read_data_into_fd(a, 1);
 			else
 				r = archive_read_extract2(a, entry, writer);
 			if (r != ARCHIVE_OK) {
 				if (!bsdtar->verbose)
 					safe_fprintf(stderr, "%s",
 					    archive_entry_pathname(entry));
 				safe_fprintf(stderr, ": %s",
 				    archive_error_string(a));
 				if (!bsdtar->verbose)
 					fprintf(stderr, "\n");
 				bsdtar->return_value = 1;
 			}
 			if (bsdtar->verbose)
 				fprintf(stderr, "\n");
 			if (r == ARCHIVE_FATAL)
 				break;
 		}
 	}


 	r = archive_read_close(a);
 	if (r != ARCHIVE_OK)
 		lafe_warnc(0, "%s", archive_error_string(a));
 	if (r <= ARCHIVE_WARN)
 		bsdtar->return_value = 1;

 	if (bsdtar->verbose > 2)
 		fprintf(stdout, "Archive Format: %s,  Compression: %s\n",
 		    archive_format_name(a), archive_filter_name(a, 0));

 	archive_read_free(a);
 }


 /*
  * Display information about the current file.
  *
  * The format here roughly duplicates the output of 'ls -l'.
  * This is based on SUSv2, where 'tar tv' is documented as
  * listing additional information in an "unspecified format,"
  * and 'pax -l' is documented as using the same format as 'ls -l'.
  */
 static void
 list_item_verbose(struct bsdtar *bsdtar, FILE *out, struct archive_entry *entry)
 {
 	char			 tmp[100];
 	size_t			 w;
 	const char		*p;
 	const char		*fmt;
 	time_t			 tim;
 	static time_t		 now;

 	/*
 	 * We avoid collecting the entire list in memory at once by
 	 * listing things as we see them.  However, that also means we can't
 	 * just pre-compute the field widths.  Instead, we start with guesses
 	 * and just widen them as necessary.  These numbers are completely
 	 * arbitrary.
 	 */
 	if (!bsdtar->u_width) {
 		bsdtar->u_width = 6;
 		bsdtar->gs_width = 13;
 	}
 	if (!now)
 		time(&now);
 	fprintf(out, "%s %d ",
 	    archive_entry_strmode(entry),
 	    archive_entry_nlink(entry));

 	/* Use uname if it's present, else uid. */
 	p = archive_entry_uname(entry);
 	if ((p == NULL) || (*p == '\0')) {
 		sprintf(tmp, "%lu ",
 		    (unsigned long)archive_entry_uid(entry));
 		p = tmp;
 	}
 	w = strlen(p);
 	if (w > bsdtar->u_width)
 		bsdtar->u_width = w;
 	fprintf(out, "%-*s ", (int)bsdtar->u_width, p);

 	/* Use gname if it's present, else gid. */
 	p = archive_entry_gname(entry);
 	if (p != NULL && p[0] != '\0') {
 		fprintf(out, "%s", p);
 		w = strlen(p);
 	} else {
 		sprintf(tmp, "%lu",
 		    (unsigned long)archive_entry_gid(entry));
 		w = strlen(tmp);
 		fprintf(out, "%s", tmp);
 	}

 	/*
 	 * Print device number or file size, right-aligned so as to make
 	 * total width of group and devnum/filesize fields be gs_width.
 	 * If gs_width is too small, grow it.
 	 */
 	if (archive_entry_filetype(entry) == AE_IFCHR
 	    || archive_entry_filetype(entry) == AE_IFBLK) {
 		sprintf(tmp, "%lu,%lu",
 		    (unsigned long)archive_entry_rdevmajor(entry),
 		    (unsigned long)archive_entry_rdevminor(entry));
 	} else {
 		strcpy(tmp, tar_i64toa(archive_entry_size(entry)));
 	}
 	if (w + strlen(tmp) >= bsdtar->gs_width)
 		bsdtar->gs_width = w+strlen(tmp)+1;
 	fprintf(out, "%*s", (int)(bsdtar->gs_width - w), tmp);

 	/* Format the time using 'ls -l' conventions. */
 	tim = archive_entry_mtime(entry);
 #define	HALF_YEAR (time_t)365 * 86400 / 2
 #if defined(_WIN32) && !defined(__CYGWIN__)
 #define	DAY_FMT  "%d"  /* Windows' strftime function does not support %e format. */
 #else
 #define	DAY_FMT  "%e"  /* Day number without leading zeros */
 #endif
 	if (tim < now - HALF_YEAR || tim > now + HALF_YEAR)
 		fmt = bsdtar->day_first ? DAY_FMT " %b  %Y" : "%b " DAY_FMT "  %Y";
 	else
 		fmt = bsdtar->day_first ? DAY_FMT " %b %H:%M" : "%b " DAY_FMT " %H:%M";
 	strftime(tmp, sizeof(tmp), fmt, localtime(&tim));
 	fprintf(out, " %s ", tmp);
 	safe_fprintf(out, "%s", archive_entry_pathname(entry));

 	/* Extra information for links. */
 	if (archive_entry_hardlink(entry)) /* Hard link */
 		safe_fprintf(out, " link to %s",
 		    archive_entry_hardlink(entry));
 	else if (archive_entry_symlink(entry)) /* Symbolic link */
 		safe_fprintf(out, " -> %s", archive_entry_symlink(entry));
 }

 static int
 unmatched_inclusions_warn(struct archive *matching, const char *msg)
 {
 	const char *p;
 	int r;

 	if (matching == NULL)
 		return (0);

 	while ((r = archive_match_path_unmatched_inclusions_next(
 	    matching, &p)) == ARCHIVE_OK)
 		lafe_warnc(0, "%s: %s", p, msg);
 	if (r == ARCHIVE_FATAL)
 		lafe_errc(1, errno, "Out of memory");

 	return (archive_match_path_unmatched_inclusions(matching));
 }
	/*-
	* 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 "bsdtar_platform.h"
	__FBSDID("$FreeBSD: src/usr.bin/tar/read.c,v 1.40 2008/08/21 06:41:14 kientzle Exp $");

	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_PARAM_H
	#include <sys/param.h>
	#endif
	#ifdef HAVE_SYS_STAT_H
	#include <sys/stat.h>
	#endif

	#ifdef HAVE_ERRNO_H
	#include <errno.h>
	#endif
	#ifdef HAVE_GRP_H
	#include <grp.h>
	#endif
	#ifdef HAVE_LIMITS_H
	#include <limits.h>
	#endif
	#ifdef HAVE_PWD_H
	#include <pwd.h>
	#endif
	#ifdef HAVE_STDINT_H
	#include <stdint.h>
	#endif
	#include <stdio.h>
	#ifdef HAVE_STDLIB_H
	#include <stdlib.h>
	#endif
	#ifdef HAVE_STRING_H
	#include <string.h>
	#endif
	#ifdef HAVE_TIME_H
	#include <time.h>
	#endif
	#ifdef HAVE_UNISTD_H
	#include <unistd.h>
	#endif

	#include "bsdtar.h"
	#include "err.h"

	struct progress_data {
	struct bsdtar *bsdtar;
	struct archive *archive;
	struct archive_entry *entry;
	};

	static void list_item_verbose(struct bsdtar , FILE ,
	struct archive_entry *);
	static void read_archive(struct bsdtar bsdtar, char mode, struct archive );
	static int unmatched_inclusions_warn(struct archive matching, const char );


	void
	tar_mode_t(struct bsdtar *bsdtar)
	{
	read_archive(bsdtar, 't', NULL);
	if (unmatched_inclusions_warn(bsdtar->matching,
	"Not found in archive") != 0)
	bsdtar->return_value = 1;
	}

	void
	tar_mode_x(struct bsdtar *bsdtar)
	{
	struct archive *writer;

	writer = archive_write_disk_new();
	if (writer == NULL)
	lafe_errc(1, ENOMEM, "Cannot allocate disk writer object");
	if (!bsdtar->option_numeric_owner)
	archive_write_disk_set_standard_lookup(writer);
	archive_write_disk_set_options(writer, bsdtar->extract_flags);

	read_archive(bsdtar, 'x', writer);

	if (unmatched_inclusions_warn(bsdtar->matching,
	"Not found in archive") != 0)
	bsdtar->return_value = 1;
	archive_write_free(writer);
	}

	static void
	progress_func(void *cookie)
	{
	struct progress_data *progress_data = cookie;
	struct bsdtar *bsdtar = progress_data->bsdtar;
	struct archive *a = progress_data->archive;
	struct archive_entry *entry = progress_data->entry;
	uint64_t comp, uncomp;
	int compression;

	if (!need_report())
	return;

	if (bsdtar->verbose)
	fprintf(stderr, "\n");
	if (a != NULL) {
	comp = archive_filter_bytes(a, -1);
	uncomp = archive_filter_bytes(a, 0);
	if (comp > uncomp)
	compression = 0;
	else
	compression = (int)((uncomp - comp) * 100 / uncomp);
	fprintf(stderr,
	"In: %s bytes, compression %d%%;",
	tar_i64toa(comp), compression);
	fprintf(stderr, " Out: %d files, %s bytes\n",
	archive_file_count(a), tar_i64toa(uncomp));
	}
	if (entry != NULL) {
	safe_fprintf(stderr, "Current: %s",
	archive_entry_pathname(entry));
	fprintf(stderr, " (%s bytes)\n",
	tar_i64toa(archive_entry_size(entry)));
	}
	}

	/*
	* Handle 'x' and 't' modes.
	*/
	static void
	read_archive(struct bsdtar bsdtar, char mode, struct archive writer)
	{
	struct progress_data progress_data;
	FILE *out;
	struct archive *a;
	struct archive_entry *entry;
	const char *reader_options;
	int r;

	while (*bsdtar->argv) {
	if (archive_match_include_pattern(bsdtar->matching,
	*bsdtar->argv) != ARCHIVE_OK)
	lafe_errc(1, 0, "Error inclusion pattern: %s",
	archive_error_string(bsdtar->matching));
	bsdtar->argv++;
	}

	if (bsdtar->names_from_file != NULL)
	if (archive_match_include_pattern_from_file(
	bsdtar->matching, bsdtar->names_from_file,
	bsdtar->option_null) != ARCHIVE_OK)
	lafe_errc(1, 0, "Error inclusion pattern: %s",
	archive_error_string(bsdtar->matching));

	a = archive_read_new();
	if (cset_read_support_filter_program(bsdtar->cset, a) == 0)
	archive_read_support_filter_all(a);
	archive_read_support_format_all(a);

	reader_options = getenv(ENV_READER_OPTIONS);
	if (reader_options != NULL) {
	char *p;
	/* Set default read options. */
	p = malloc(sizeof(IGNORE_WRONG_MODULE_NAME)
	+ strlen(reader_options) + 1);
	if (p == NULL)
	lafe_errc(1, errno, "Out of memory");
	/* Prepend magic code to ignore options for
	* a format or modules which are not added to
	* the archive read object. */
	strncpy(p, IGNORE_WRONG_MODULE_NAME,
	sizeof(IGNORE_WRONG_MODULE_NAME) -1);
	strcpy(p + sizeof(IGNORE_WRONG_MODULE_NAME) -1, reader_options);
	r = archive_read_set_options(a, p);
	free(p);
	if (r == ARCHIVE_FATAL)
	lafe_errc(1, 0, "%s", archive_error_string(a));
	else
	archive_clear_error(a);
	}
	if (ARCHIVE_OK != archive_read_set_options(a, bsdtar->option_options))
	lafe_errc(1, 0, "%s", archive_error_string(a));
	if (archive_read_open_filename(a, bsdtar->filename,
	bsdtar->bytes_per_block))
	lafe_errc(1, 0, "Error opening archive: %s",
	archive_error_string(a));

	do_chdir(bsdtar);

	if (mode == 'x') {
	/* Set an extract callback so that we can handle SIGINFO. */
	progress_data.bsdtar = bsdtar;
	progress_data.archive = a;
	archive_read_extract_set_progress_callback(a, progress_func,
	&progress_data);
	}

	if (mode == 'x' && bsdtar->option_chroot) {
	#if HAVE_CHROOT
	if (chroot(".") != 0)
	lafe_errc(1, errno, "Can't chroot to \".\"");
	#else
	lafe_errc(1, 0,
	"chroot isn't supported on this platform");
	#endif
	}

	for (;;) {
	/* Support --fast-read option */
	if (bsdtar->option_fast_read &&
	archive_match_path_unmatched_inclusions(bsdtar->matching) == 0)
	break;

	r = archive_read_next_header(a, &entry);
	progress_data.entry = entry;
	if (r == ARCHIVE_EOF)
	break;
	if (r < ARCHIVE_OK)
	lafe_warnc(0, "%s", archive_error_string(a));
	if (r <= ARCHIVE_WARN)
	bsdtar->return_value = 1;
	if (r == ARCHIVE_RETRY) {
	/* Retryable error: try again */
	lafe_warnc(0, "Retrying...");
	continue;
	}
	if (r == ARCHIVE_FATAL)
	break;

	if (bsdtar->uid >= 0) {
	archive_entry_set_uid(entry, bsdtar->uid);
	archive_entry_set_uname(entry, NULL);
	}
	if (bsdtar->gid >= 0) {
	archive_entry_set_gid(entry, bsdtar->gid);
	archive_entry_set_gname(entry, NULL);
	}
	if (bsdtar->uname)
	archive_entry_set_uname(entry, bsdtar->uname);
	if (bsdtar->gname)
	archive_entry_set_gname(entry, bsdtar->gname);

	/*
	* Note that pattern exclusions are checked before
	* pathname rewrites are handled. This gives more
	* control over exclusions, since rewrites always lose
	* information. (For example, consider a rewrite
	* s/foo[0-9]/foo/. If we check exclusions after the
	* rewrite, there would be no way to exclude foo1/bar
	* while allowing foo2/bar.)
	*/
	if (archive_match_excluded(bsdtar->matching, entry))
	continue; /* Excluded by a pattern test. */

	if (mode == 't') {
	/* Perversely, gtar uses -O to mean "send to stderr"
	* when used with -t. */
	out = bsdtar->option_stdout ? stderr : stdout;

	/*
	* TODO: Provide some reasonable way to
	* preview rewrites. gtar always displays
	* the unedited path in -t output, which means
	* you cannot easily preview rewrites.
	*/
	if (bsdtar->verbose < 2)
	safe_fprintf(out, "%s",
	archive_entry_pathname(entry));
	else
	list_item_verbose(bsdtar, out, entry);
	fflush(out);
	r = archive_read_data_skip(a);
	if (r == ARCHIVE_WARN) {
	fprintf(out, "\n");
	lafe_warnc(0, "%s",
	archive_error_string(a));
	}
	if (r == ARCHIVE_RETRY) {
	fprintf(out, "\n");
	lafe_warnc(0, "%s",
	archive_error_string(a));
	}
	if (r == ARCHIVE_FATAL) {
	fprintf(out, "\n");
	lafe_warnc(0, "%s",
	archive_error_string(a));
	bsdtar->return_value = 1;
	break;
	}
	fprintf(out, "\n");
	} else {
	/* Note: some rewrite failures prevent extraction. */
	if (edit_pathname(bsdtar, entry))
	continue; /* Excluded by a rewrite failure. */

	if (bsdtar->option_interactive &&
	!yes("extract '%s'", archive_entry_pathname(entry)))
	continue;

	/*
	* Format here is from SUSv2, including the
	* deferred '\n'.
	*/
	if (bsdtar->verbose) {
	safe_fprintf(stderr, "x %s",
	archive_entry_pathname(entry));
	fflush(stderr);
	}

	/* TODO siginfo_printinfo(bsdtar, 0); */

	if (bsdtar->option_stdout)
	r = archive_read_data_into_fd(a, 1);
	else
	r = archive_read_extract2(a, entry, writer);
	if (r != ARCHIVE_OK) {
	if (!bsdtar->verbose)
	safe_fprintf(stderr, "%s",
	archive_entry_pathname(entry));
	safe_fprintf(stderr, ": %s",
	archive_error_string(a));
	if (!bsdtar->verbose)
	fprintf(stderr, "\n");
	bsdtar->return_value = 1;
	}
	if (bsdtar->verbose)
	fprintf(stderr, "\n");
	if (r == ARCHIVE_FATAL)
	break;
	}
	}


	r = archive_read_close(a);
	if (r != ARCHIVE_OK)
	lafe_warnc(0, "%s", archive_error_string(a));
	if (r <= ARCHIVE_WARN)
	bsdtar->return_value = 1;

	if (bsdtar->verbose > 2)
	fprintf(stdout, "Archive Format: %s, Compression: %s\n",
	archive_format_name(a), archive_filter_name(a, 0));

	archive_read_free(a);
	}


	/*
	* Display information about the current file.
	*
	* The format here roughly duplicates the output of 'ls -l'.
	* This is based on SUSv2, where 'tar tv' is documented as
	* listing additional information in an "unspecified format,"
	* and 'pax -l' is documented as using the same format as 'ls -l'.
	*/
	static void
	list_item_verbose(struct bsdtar bsdtar, FILE out, struct archive_entry *entry)
	{
	char tmp[100];
	size_t w;
	const char *p;
	const char *fmt;
	time_t tim;
	static time_t now;

	/*
	* We avoid collecting the entire list in memory at once by
	* listing things as we see them. However, that also means we can't
	* just pre-compute the field widths. Instead, we start with guesses
	* and just widen them as necessary. These numbers are completely
	* arbitrary.
	*/
	if (!bsdtar->u_width) {
	bsdtar->u_width = 6;
	bsdtar->gs_width = 13;
	}
	if (!now)
	time(&now);
	fprintf(out, "%s %d ",
	archive_entry_strmode(entry),
	archive_entry_nlink(entry));

	/* Use uname if it's present, else uid. */
	p = archive_entry_uname(entry);
	if ((p == NULL) \|\| (*p == '\0')) {
	sprintf(tmp, "%lu ",
	(unsigned long)archive_entry_uid(entry));
	p = tmp;
	}
	w = strlen(p);
	if (w > bsdtar->u_width)
	bsdtar->u_width = w;
	fprintf(out, "%-*s ", (int)bsdtar->u_width, p);

	/* Use gname if it's present, else gid. */
	p = archive_entry_gname(entry);
	if (p != NULL && p[0] != '\0') {
	fprintf(out, "%s", p);
	w = strlen(p);
	} else {
	sprintf(tmp, "%lu",
	(unsigned long)archive_entry_gid(entry));
	w = strlen(tmp);
	fprintf(out, "%s", tmp);
	}

	/*
	* Print device number or file size, right-aligned so as to make
	* total width of group and devnum/filesize fields be gs_width.
	* If gs_width is too small, grow it.
	*/
	if (archive_entry_filetype(entry) == AE_IFCHR
	\|\| archive_entry_filetype(entry) == AE_IFBLK) {
	sprintf(tmp, "%lu,%lu",
	(unsigned long)archive_entry_rdevmajor(entry),
	(unsigned long)archive_entry_rdevminor(entry));
	} else {
	strcpy(tmp, tar_i64toa(archive_entry_size(entry)));
	}
	if (w + strlen(tmp) >= bsdtar->gs_width)
	bsdtar->gs_width = w+strlen(tmp)+1;
	fprintf(out, "%*s", (int)(bsdtar->gs_width - w), tmp);

	/* Format the time using 'ls -l' conventions. */
	tim = archive_entry_mtime(entry);
	#define HALF_YEAR (time_t)365 * 86400 / 2
	#if defined(_WIN32) && !defined(__CYGWIN__)
	#define DAY_FMT "%d" /* Windows' strftime function does not support %e format. */
	#else
	#define DAY_FMT "%e" /* Day number without leading zeros */
	#endif
	if (tim < now - HALF_YEAR \|\| tim > now + HALF_YEAR)
	fmt = bsdtar->day_first ? DAY_FMT " %b %Y" : "%b " DAY_FMT " %Y";
	else
	fmt = bsdtar->day_first ? DAY_FMT " %b %H:%M" : "%b " DAY_FMT " %H:%M";
	strftime(tmp, sizeof(tmp), fmt, localtime(&tim));
	fprintf(out, " %s ", tmp);
	safe_fprintf(out, "%s", archive_entry_pathname(entry));

	/* Extra information for links. */
	if (archive_entry_hardlink(entry)) /* Hard link */
	safe_fprintf(out, " link to %s",
	archive_entry_hardlink(entry));
	else if (archive_entry_symlink(entry)) /* Symbolic link */
	safe_fprintf(out, " -> %s", archive_entry_symlink(entry));
	}

	static int
	unmatched_inclusions_warn(struct archive matching, const char msg)
	{
	const char *p;
	int r;

	if (matching == NULL)
	return (0);

	while ((r = archive_match_path_unmatched_inclusions_next(
	matching, &p)) == ARCHIVE_OK)
	lafe_warnc(0, "%s: %s", p, msg);
	if (r == ARCHIVE_FATAL)
	lafe_errc(1, errno, "Out of memory");

	return (archive_match_path_unmatched_inclusions(matching));
	}