2022-04-07  Jim Meyering  <meyering@fb.com>

	version 1.12
	* NEWS: Record release date.

2022-04-07  Paul Eggert  <eggert@cs.ucla.edu>

	zgrep: fix "binary file matches" mislabeling
	Problem reported by Jim Avera (Bug#31280).
	This became more of an issue when GNU grep 3.5 (2020) started sending
	"binary file matches" diagnostics to stderr instead of to stdout.
	* tests/Makefile.am (TESTS): Add zgrep-binary.
	* tests/zgrep-binary: New test.
	* zgrep.in (args): New var, to accumulate args separately
	from grep command, so we can prepend args if need be.
	Most uses of 'grep' changed to use 'args' instead, or also.
	(with_filename): Set to 1 if more than one file and -h not given;
	this simplifies later code.
	(gnuish_grep): New var; evaluates to true if grep supports
	-H and --label options, as is true for GNU and FreeBSD grep.
	Append -H to 'grep' if outputting file names with GNUish grep,
	and use --label with GNUish grep unless reading from stdin,
	as that’s safer and more efficient than relabeling with 'sed'.

	maint: use C locale more often
	* gzexe.in, zdiff.in, zgrep.in:
	Run expr and sed in the C locale when it might help to avoid
	undefined behavior on non-GNU platforms.
	* sample/zfile, znew.in: Run in the C locale, for simplicity and
	to avoid undefined behavior on non-GNU platforms.

	gzexe: optimize out a grep
	* gzexe.in: Avoid an unnecessary invocation of ‘grep’,
	by using sed instead.  Also, look only for at-most-3-digit numbers,
	for consistency with the rest of the script.

	gzip: mention when fixed bugs were introduced

	zgrep: port to POSIX sed
	* zgrep.in (res): When escaping the file name do not rely on GNU
	sed’s extension to POSIX with respect to s/.../\n/.  Instead, use
	features that should also work with AIX and/or Solaris sed.  This is
	simpler anyway, and would have prevented the recently-fixed bug.

2022-04-07  Jim Meyering  <meyering@fb.com>

	zgrep: add NEWS and tests for this exploitable bug
	* tests/zgrep-abuse: New file, based on PoC by cleemy desu wayo.
	* tests/Makefile.am (TESTS): Add it.
	* NEWS: Mention the exploit.
	The bug appears to have been present since the beginning.

2022-04-06  Lasse Collin  <lasse.collin@tukaani.org>

	zgrep: avoid exploit via multi-newline file names
	* zgrep.in: The issue with the old code is that with multiple
	newlines, the N-command will read the second line of input,
	then the s-commands will be skipped because it's not the end
	of the file yet, then a new sed cycle starts and the pattern
	space is printed and emptied. So only the last line or two get
	escaped. This patch makes sed read all lines into the pattern
	space and then do the escaping.

	This vulnerability was discovered by:
	cleemy desu wayo working with Trend Micro Zero Day Initiative

2022-04-06  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: fix i386 port
	* deflate.c (prev_length, match_start, max_chain_length, good_match):
	Make these extern instead of static, reverting part of the
	2021-12-01T21:46:36Z!eggert@cs.ucla.edu patch.  These symbols are
	used by i386 asm, and so must be extern at least for i386.

	maint: pacify GCC with recent x86 glibc
	* configure.ac (WERROR_CFLAGS): Disable -Wtype-limits,
	due to a false alarm on platforms where 'long' is 32 bits
	and time_t is 64-bit, such as recent glibc on x86.

2022-04-04  Paul Eggert  <eggert@cs.ucla.edu>

	maint: update from Gnulib
	* bootstrap, tests/init.sh: Copy manually from current Gnulib.
	* lib/.gitignore, m4/.gitignore: Update as per current Gnulib.

	build: update gnulib submodule to latest

	build: support --program-prefix etc.
	Problem reported by Antonio Diaz Diaz via Dagobert Michelsen in:
	https://bugs.gnu.org/16876
	* Makefile.am (.in): Substitute for 'gzip', 'zdiff', 'zgrep'.
	($(GZIP_TRANSFORMED), $(ZDIFF_TRANSFORMED), $(ZGREP_TRANSFORMED)):
	New rules to build forwarding shell scripts, if needed.
	Add these files to BUILT_SOURCES and MOSTLY_CLEANFILES if needed.
	* configure.ac (GZIP_TRANSFORMED, ZDIFF_TRANSFORMED, ZGREP_TRANSFORMED):
	New substituted vars.
	(GZIP_IS_TRANSFORMED, ZDIFF_IS_TRANSFORMED, ZGREP_IS_TRANSFORMED):
	New Automake conditions.
	* gunzip.in, gzexe.in, zcat.in, zcmp.in, zdiff.in, zegrep.in:
	* zfgrep.in, zforce.in, zgrep.in, zless.in, zmore.in, znew.in:
	Quote possibly-transformed subcommand names.

2022-04-01  Paul Eggert  <eggert@cs.ucla.edu>

	doc: improve doc for saved timestamps etc.
	Problem reported by Carpe Sébastien (Bug#24559).

2022-03-31  Paul Eggert  <eggert@cs.ucla.edu>

	tests: port list-big test to macOS 12.1
	* tests/list-big: Use dd, not truncate, to create a big file.

	zmore: don't assume benign PAGER in testing
	* tests/help-version (zmore_setup): Unset PAGER so that we test
	'more', not whatever the tester has in its PAGER environment
	variable.  This works around a problem I found when I ran
	'PAGER=less make check' on a platform that lacked 'less'.

	zless: install only on platforms with 'less'
	Problem reported by Michael Felt (Bug#30029).
	* Makefile.am (ZLESS_MAN, ZLESS_PROG): New macros.
	(man_MANS, bin_SCRIPTS): Use them.
	* configure.ac: Check for 'less'.
	* tests/Makefile.am (ZLESS_PROG): New macro.
	(built_programs): Use it.

2022-03-29  Paul Eggert  <eggert@cs.ucla.edu>

	doc: spelling fixes

	doc: omit @refill
	* doc/gzip.texi: Remove @refill to suppress warning
	‘gzip.texi:562: warning: @refill is obsolete.’ from makeinfo 6.8.

2022-03-08  Paul Eggert  <eggert@cs.ucla.edu>

	zdiff: fix another arg-handling bug
	Also allow args after file names.
	Problem reported by Lv Ying <https://bugs.gnu.org/54290#12>.

2022-03-07  Paul Eggert  <eggert@cs.ucla.edu>

	zdiff: fix arg handling bug
	Problem reported by Lv Ying (Bug#54291).
	* zdiff.in (escape): Handle args like '-C 5'.

2022-02-10  Paul Eggert  <eggert@cs.ucla.edu>

	doc: embolden SEE ALSO refs
	Problem reported by Helge Kreutzmann (Bug#53918).

2022-01-03  Jim Meyering  <meyering@fb.com>

	maint: avoid new syntax-check failures
	* cfg.mk (local-checks-to-skip): Add sc_indent, to skip it.
	Otherwise, "make syntax-check" would fail.

	build: disable some expensive compiler warnings by default
	* configure.ac (gl_GCC_VERSION_IFELSE): Copy from coreutils.
	(gcc-warnings): Update from coreutils.

	maint: make update-copyright

	build: update gnulib to latest; also bootstrap and init.sh

2021-12-15  Paul Eggert  <eggert@cs.ucla.edu>

	doc: document gzip -l change
	* NEWS, doc/gzip.texi (Invoking gzip), gzip.1 (gunzip):
	Document recent change.

	gzip: gzip -l now outputs accurate size
	gzip -l now decompresses to see how long the uncompressed file was.
	This fixes what is by far the most common bug report for gzip.
	It has a significant performance cost, but it’s worth it nowadays.
	* gzip.c (main): -l now sets 'test' too.  All uses of
	'test' changed.
	(treat_stdin, treat_file): Call do_list after decompressing,
	so that the length is known.
	(do_list): Omit arg IFD, since it is no longer needed.
	All callers changed.  Get the CRC and uncompressed size
	from input_crc and bytes_out instead of using lseek.
	* tests/list-big: New test.
	* unzip.c (unzip): Set unzip_crc before returning.
	* util.c (write_buf): If 'test', output nothing.
	Update bytes_out with output byte count, regardless of 'test'.
	All callers changed.

2021-12-01  Paul Eggert  <eggert@cs.ucla.edu>

	maint: reduce module coupling
	If a symbol is extern but never used by another module, make it
	static instead, or remove it if it is not used anywhere.
	* Makefile.am (gzip_SOURCES): Remove lzw.c.
	* bits.c (bi_buf, bi_valid) [!IBM_Z_DFLTCC]:
	* deflate.c (prev_length, match_start, max_chain_length)
	(good_match, lm_init):
	* gzip.c (verbose) [!DEBUG]:
	* unlzw.c (block_mode):
	Now static.
	* gzip.c (help, main, do_lzw):
	* revision.h:
	Simplify by assuming !LZW.
	* util.c (setcrc): Define only if IBM_Z_DFLTCC.
	(make_simple_name): Define only if NO_MULTIPLE_DOTS.

2021-10-30  Paul Eggert  <eggert@cs.ucla.edu>

	maint: modernize README-{hacking,prereq}

2021-09-07  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2021-09-03  Jim Meyering  <meyering@fb.com>

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 1.11
	* NEWS: Record release date.

2021-08-31  Paul Eggert  <eggert@cs.ucla.edu>

	tests: port still better to NetBSD
	* tests/hufts: Ignore more lines starting with ‘+’ in stderr.

	tests: port better to NetBSD
	* tests/hufts, tests/zdiff:
	Ignore lines starting with ‘+’ in stderr.
	The NetBSD shell outputs them after set -x.

	tests: update help-version from coreutils
	This merges coreutils/tests/misc/help-version.sh into
	gzip/tests/help-version; they're now identical except
	for the initial init.sh configuration line.  This
	should port better to NetBSD.

	maint: update .gitignore files
	* .gitignore, lib/.gitignore, m4/.gitignore:
	Bring up to date.  Remove duplicates.  Sort.

	tests: port two-files to IRIX 6.5
	Problem reported by Nelson H. F. Beebe.
	* tests/two-files: Skip test if /dev/urandom is not readable.

2021-08-29  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

	maint: don't send announcements to TP coordinator
	gzip has no translatable strings, so don't include the translation
	project coordinator's email address in the announcement template.
	* cfg.mk (translation_project_): Define to be empty.

2021-08-19  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: clarify "other links" diagnostic
	* gzip.c (treat_file): Instead of saying
	"gzip: FOO has 1 other link  -- unchanged", say
	"gzip: FOO has 1 other link -- file ignored".
	This is clearer when -k is also used (Bug#50097).

2021-08-08  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

2021-06-30  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

2021-04-11  Dmitry V. Levin  <ldv@altlinux.org>

	bug#47715: [PATCH] gzip.c: use a more portable alignment
	The alignment of 8192 introduced by commit
	be0c5581e38332b2ffa8a4cf92076cfde02872b4 is not quite portable:
	eu-elflint --gnu-ld complains about the result gzip executable
	with the following diagnostics:
	section [25] '.bss' not fully contained in segment of program header entry 6

	* gzip.c [__alignas_is_defined] (BUFFER_ALIGNED): Decrease alignment
	from 8192 back to 4096.

2021-03-07  Paul Eggert  <eggert@cs.ucla.edu>

	maint: modernize .gitignore
	* lib/.gitignore, m4/.gitignore: Sort and modernize
	to current Gnulib.

	zgrep: fix option typo
	* zgrep.in: Fix typo in option processing that prevented
	operands like ‘binary-1’.

	gzip: port to SIGPIPE-less platforms
	* gzip.c (main): Don’t assume SIGPIPE is defined.

2021-02-26  Paul Eggert  <eggert@cs.ucla.edu>

	* gzip.1: Quote better (Bug#46730).

2021-01-01  Jim Meyering  <meyering@fb.com>

	maint: update all copyright year number ranges
	Run "make update-copyright" and then...
	* gnulib: Update to latest with copyright year adjusted.
	* tests/init.sh: Sync with gnulib to pick up copyright year.
	* bootstrap: Likewise.

2020-12-09  Jim Meyering  <meyering@fb.com>

	maint: avoid another autoreconf warning
	* configure.ac: modernize AC_TRY_COMPILE invocation
	Use AC_COMPILE_IFELSE instead of AC_TRY_COMPILE.

	maint: remove uses of obsolete macros
	* configure.ac (AC_TYPE_SIGNAL, AC_ISC_POSIX, AC_HEADER_STDC): Remove.

	maint: avoid autoreconf warnings
	* configure.ac: Go back to using AC_PROG_CC rather than AC_PROG_CC_STDC,
	as the latter is obsolescent and the Autoconf bug involving the former
	has been fixed.

	build: update gnulib to latest

	build: require autoconf-2.64
	* configure.ac: Require autoconf-2.64, up from 2.63, to align with gnulib.

2020-09-24  Ilya Leoshkevich  <iii@linux.ibm.com>

	Add a test for compressing and decompressing two files
	It ensures that compression and decompression state of the first file
	does not affect the second file.

	Fix DFLTCC segfault when compressing or decompressing two files
	The value in total_in global variable from processing the first file
	affected processing of the second file.  Fix by making total_in local.

	bug#43583: Fix building DFLTCC with clang
	clang does not support .machinemode, so put it under an #ifdef.

	Update .gitignore files
	On my s390x Fedora 31 machine there are a bunch of extra files copied to
	lib and m4 directories.  Add them to .gitignore.

2020-08-31  Paul Eggert  <eggert@cs.ucla.edu>

	doc: prefer bold to italics for command names

2020-05-29  Ilya Leoshkevich  <iii@linux.ibm.com>

	IBM Z DFLTCC: add STREQ definition
	Commit 81c9fe4d0986 replaced !strcmp with STREQ in order to be compliant
	with the gnulib linter, however, gnulib does not provide STREQ!

	Quite a few gnulib .c files contain private definitions of STREQ. This
	patch just goes with the flow and does the same in dfltcc.c.

2020-03-21  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

2020-03-21  Bjarni Ingi Gislason  <bjarniig@rhi.hi.is>

	doc: gzip.1: Change .BR to .B as there is only one argument
	* gzip.1: Use .B rather than .BR to avoid diagnostics from an
	upcoming version of groff:
	  $ groff -b -e -mandoc -T utf8 -rF0 -t -w w -z
	  <gzip.1>:327 (macro BR): only 1 argument, but more are expected
	  <gzip.1>:459 (macro BR): only 1 argument, but more are expected
	This addresses https://bugs.gnu.org/39845

2020-03-14  Jim Meyering  <meyering@fb.com>

	doc: man page improvements
	* gzip.1 (REPORTING BUGS): New section.
	(-t, --test): Add "then quit" at end of sentence to clarify what
	this option does.
	Reported by Dan Jacobson in https://bugs.gnu.org/839768.

2020-01-10  Ilya Leoshkevich  <iii@linux.ibm.com>

	IBM Z DFLTCC: fix three data corruption issues
	SUSE maintainers have found an issue related to building zlib in 31-bit
	mode, which also applies to gzip: STFLE instruction can be used only in
	z/Architecture mode: https://build.opensuse.org/request/show/708284 --
	I have integrated the fix into this patch.

	* configure.ac (AC_CHECK_HEADERS_ONCE): Add feature detection for
	sys/sdt.h probes.
	* dfltcc.c (dfltcc_cc): Minor formatting improvements.
	(HB_BITS): Remove.
	(HB_SIZE): Likewise.
	(is_dfltcc_enabled): Fix buffer overrun on newer models and incomplete
	initialization on older models.
	Add machine mode hint.
	(dfltcc): Use sys/sdt.h feature detection.
	(bi_load): New function.
	(bi_close_block): Use bi_load.
	(close_stream): Fix overwriting the End-of-block Symbol.
	(dfltcc_deflate): Fix losing partial byte on flush.
	Fix setting Block-Continuation Flag when DFLTCC-CMPR outputs 0 bits and
	requests a retry.
	Minor formatting improvements.
	(dfltcc_inflate): Retry immediately if requested.
	Print the hardware error code and flush the output buffer on error.
	Minor formatting improvements.
	* tests/hufts: Ignore the hardware error code.

2020-01-05  Ilya Leoshkevich  <iii@linux.ibm.com>

	Document IBM Z environment variables
	IBM Z patch (7a6f9c9) introduced 6 environment variables, which are
	used to tune the compression and decompression with the DEFLATE
	COMPRESSION CALL instruction.  This patch adds texinfo documentation for
	all of them.

	* doc/gzip.texi (Environment): Add DFLTCC* environment variables.

2020-01-01  Jim Meyering  <meyering@fb.com>

	maint: update all copyright year number ranges
	Run "make update-copyright" and then...
	* gnulib: Update to latest with copyright year adjusted.
	* tests/init.sh: Sync with gnulib to pick up copyright year.
	* bootstrap: Likewise.

	maint: change calloc module to calloc-gnu
	* bootstrap.conf (gnulib_modules): Use calloc-gnu module,
	not the deprecated "calloc".

2019-09-07  Jim Meyering  <meyering@fb.com>

	maint: placate strcmp-vs-STREQ syntax check rule
	* dfltcc.c (is_dfltcc_enabled): Use STREQ (env, "0")
	in place of "!strcmp (env, "0").

2019-04-02  Paul Eggert  <eggert@cs.ucla.edu>

	Improve IBM Z patch
	Most of this is minor changes to use GNU style and C99 constructs.
	* NEWS: Mention IBM Z.
	* bootstrap.conf (gnulib_modules): Add stdalign.
	* dfltcc.c: Include stdalign.h, stdbool.h.
	(union aligned_dfltcc_qaf_param, union aligned_dfltcc_param_v0):
	New types, used for C11-style alignment.  All uses changed.
	(init_param):
	* gzip.c (BUFFER_ALIGNED): New macro.
	(inbuf, outbuf, window): Use it, so buffers are aligned everywhere.
	* gzip.h (INBUFSIZ, OUTBUFSIZE): Use big buffers everywhere,
	unless SMALL_MEM.
	* zip.c (SLOW, FAST): Now enums since they need not be macros:

2019-04-02  Ilya Leoshkevich  <iii@linux.ibm.com>

	bug#34918: [PATCH] Add support for IBM Z hardware-accelerated deflate
	Future versions of IBM Z mainframes will provide DFLTCC instruction,
	which implements deflate algorithm in hardware with estimated
	compression and decompression performance orders of magnitude faster
	than the current gzip and ratio comparable with that of level 1.

	This patch adds DFLTCC support to gzip. In order to enable it, the
	following build commands should be used:

	    $ ./configure --enable-dfltcc
	    $ make

	When built like this, gzip would compress in hardware on level 1, and in
	software on all other levels. Decompression will always happen in
	hardware. In order to enable DFLTCC compression for levels 1-6 (i.e. to
	make it used by default) one could either add -DDFLTCC_LEVEL_MASK=0x7e
	at compile time, or set the environment variable DFLTCC_LEVEL_MASK to
	0x7e at run time.

	Two DFLTCC compression calls produce the same results only when they
	both are made on machines of the same generation, and when the
	respective buffers have the same offset relative to the start of the
	page. Therefore care should be taken when using hardware compression
	when reproducible results are desired. One such use case - reproducible
	software builds - is handled explicitly: when SOURCE_DATE_EPOCH
	environment variable is set, the hardware compression is disabled.

	This patch tries to add DFLTCC support in a least intrusive way.
	All SystemZ-specific code was placed into a separate file, but
	unfortunately there is still a noticeable amount of changes in the
	main gzip code. Below is the summary of those changes.

	DFLTCC will refuse to write an End-of-block Symbol if there is no input
	data, thus in some cases it is necessary to do this manually. In order
	to achieve this, bi_buf and bi_valid were promoted to extern variables.

	lm_init() function moves the input buffer into the window, which is not
	desirable for DFLTCC. Therefore, its invocation was moved to
	software-only deflate(). In addition to initializing the window, this
	function also used to convert compression level to flags, which is still
	needed for DFLTCC. This responsibility was handed off to zip() function.

	To achieve maximum performance with DFLTCC, inbuf and outbuf must be
	256k big and page-aligned. Additionally, for DFLTCC to work at all, the
	window must be page-aligned.

	In addition to compression, DFLTCC computes CRC-32 checksum, therefore,
	whenever it's used, software checksumming needs to be suppressed and its
	results replaced by those of dfltcc. This is achieved by introducing the
	new getcrc() and setcrc() functions.

	Unlike the current software implementation, DFLTCC decompresses data
	into the output buffer, and not the window. Therefore, just like
	flushing the window, flushing the output buffer must honor the test
	flag.

	Finally, znew-k test assumes that "znew -K" would not convert the test
	.Z file to .gz, which is not the case with DFLTCC. Since this is not the
	main point of the test, this assumption was relaxed.

2019-03-26  Paul Eggert  <eggert@cs.ucla.edu>

	gzexe: fix count of lines to skip
	Problem reported by Jakub Martisko (Bug#35002).
	* gzexe.in (skip): Bump from 44 to 49.

2019-01-20  Jim Meyering  <meyering@fb.com>

	build: ensure no VLA is used
	Cause developer builds to fail for any use of a VLA.
	VLAs (variable length arrays) limit portability.
	* configure.ac (nw): Remove -Wvla from the list of disabled warnings,
	thus enabling the warning when configured with --enable-gcc-warnings.
	(GNULIB_NO_VLA) Define, disabling use of VLAs in gnulib.  This commit
	is functionally equivalent to coreutils' v8.30-44-gd26dece5d.

	build: update gnulib to latest

2019-01-01  Jim Meyering  <meyering@fb.com>

	maint: update all copyright dates via "make update-copyright"
	* gnulib: Also update submodule for its copyright updates.

2018-12-29  Jim Meyering  <meyering@fb.com>

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 1.10
	* NEWS: Record release date.

2018-12-23  Paul Eggert  <eggert@cs.ucla.edu>

	build: enable -Wunreachable-code
	* configure.ac (nw): Remove -Wunreachable-code from the list of
	disabled warnings, now that all offending statements have been removed.

	maint: remove unreachable code
	Problem reported by Oracle Developer Studio 12.6.
	In the old days we needed a return statement at the end of
	the gzip main function to pacify traditional 'lint', but
	lint checkers nowadays are smarter.
	* gzip.c (main):
	* zip.c (file_read): Remove unreachable code.

2018-12-23  Jim Meyering  <meyering@fb.com>

	maint: use a slightly cleaner expression
	* gzip.c (do_list): Simplify an expression:
	- int positive_off_t_width = INT_BUFSIZE_BOUND (off_t) - 2;
	+ int positive_off_t_width = INT_STRLEN_BOUND (off_t) - 1;

2018-12-22  Jim Meyering  <meyering@fb.com>

	build: avoid build failure with --enable-gcc-warnings and latest gcc
	* gzip.c (do_list): There was a loop to compute the maximum width
	of a decimal positive off_t value. Replace it with assignment to a
	constant.  Noticed because gcc 9.0.0 20181219 warned about its use
	as a printf format-width value.
	(OFF_T_MAX): Remove now-unused definition.

2018-12-21  Jim Meyering  <meyering@fb.com>

	maint: improve a comment
	* trees.c (flush_block): Fix grammar/spelling in a comment.

	maint: update gnulib to latest; also update bootstrap and init.sh

	build: make the autoconf-2.63 requirement explicit
	* configure.ac: AC_PREREQ: Require 2.63, not 2.59.
	Autoconf-2.63 has been required for some time via gnulib.
	This merely makes it explicit.

2018-11-30  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: fix use of uninitialized memory
	Problem reported by Hanno Böck (Bug#33501).
	* NEWS: Mention this.
	* inflate.c (inflate_dynamic): Return if code is invalid.
	Fix by Mark Adler.
	* tests/hufts: Add test case for the bug.

2018-08-19  Paul Eggert  <eggert@cs.ucla.edu>

	* gzip.c (remove_output_file): Fix typo.

	gzip: fix bug in signal-handling fix
	Problem reported by Johannes Przybilla (Bug#32375#26).
	* gzip.c (volatile_strcpy): Source is now pointer-to-volatile too.
	(remove_output_file): Copy remove_ofname to a private nonvolatile
	copy so that it can be passed to xunlink safely.

2018-08-06  Paul Eggert  <eggert@cs.ucla.edu>

	Fix some theoretical races in signal handling
	Problem reported by Johannes Przybilla (Bug#32375).
	* NEWS: Mention this.
	* bootstrap.conf (gnulib_modules): Add sigaction.
	* gzip.c (SA_NOCLDSTOP, sigprocmask, sigset_t)
	(siginterrupt) [!SA_NOCLDSTOP]: Remove; Gnulib not supplies these.
	(remove_ofname): New var.
	(volatile_strcpy): New function.
	(create_outfile): Use it.
	(install_signal_handlers, abort_gzip_signal): Assume sigaction.
	(remove_output_file): New arg SIGNALS_ALREADY_BLOCKED.
	All uses changed.  Avoid unnecessary (and racy) call
	to sigprocmask if this new arg is set.
	(abort_gzip_signal): Assume C89 or better for signal handler type.
	* gzip.h (RETSIGTYPE): Remove.
	* lib/.gitignore, m4/.gitignore:
	Add files brought in by Gnulib sigaction module.  Sort.

2018-08-04  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: port better to mingw again
	Problem reported by Bdale Garbee (Bug#32305#8).
	* gzip.c (do_chown): Use HAVE_FCHOWN || HAVE_CHOWN,
	which is configured, instead of DO_CHOWN, which is not.

2018-08-02  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: make the output more reproducible
	Problem reported by Bernhard M. Wiedemann (Bug#32342).
	* NEWS: Mention this.
	* doc/gzip.texi (Overview, Invoking gzip): Document this.
	* gzip.c (get_input_size_and_time): New function,
	which implements the change.
	(treat_stdin, treat_file): Use it.
	* tests/reproducible: New test.
	* tests/Makefile.am (TESTS): Add it.

2018-07-29  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: port better to mingw
	Problem reported by Bdale Garbee for Debian
	* gzip.c (do_chown): Don't assume uid_t and gid_t.

2018-07-01  Jim Meyering  <meyering@fb.com>

	maint: update gnulib to latest; also update bootstrap and init.sh

2018-06-30  Jim Meyering  <meyering@fb.com>

	build: remove -Wformat-truncation=2 to avoid avoid false-positive
	* configure.ac (GNULIB_WARN_CFLAGS): Add -Wformat-truncation=2,
	to disable it when building gnulib with --enable-gcc-warnings.
	This avoids what looks like a false positive from GCC 9:
	strerror_r.c: In function 'rpl_strerror_r':
	strerror_r.c:453:35: error: 'Unknown error ' directive output \
	 truncated writing 14 bytes into a region of size 2 \
	 [-Werror=format-truncation=]
	         snprintf (buf, buflen, "Unknown error %d", errnum);
	                                 ~~^~~~~~~~~~~~
	In file included from /usr/include/stdio.h:862,
	                 from ./stdio.h:43,
	                 from strerror_r.c:29:
	/usr/include/bits/stdio2.h:64:10: note: '__builtin___snprintf_chk' \
	  output between 16 and 26 bytes into a destination of size 2
	   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,

2018-01-15  Paul Eggert  <eggert@cs.ucla.edu>

	misc: update --version copyright
	* gunzip.in, gzexe.in, gzip.c, zcat.in, zdiff.in, zforce.in, zgrep.in:
	* zless.in, zmore.in, znew.in:
	Update copyright year in --version output to 2018.
	This part of the year-number update isn’t automated yet.

2018-01-07  Jim Meyering  <meyering@fb.com>

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 1.9
	* NEWS: Record release date.

2018-01-06  Paul Eggert  <eggert@cs.ucla.edu>

	gzexe: port to macOS mktemp
	Problem reported by Jeffrey Walton (Bug#30000).
	* gzexe.in, zdiff.in, zgrep.in:
	Don’t assume that mktemp works when given no arguments,
	as this is not true for macOS.  Instead, use a syntax
	that should work with coreutils, NetBSD, and macOS.
	While we’re in the neighborhood, be more consistent about how program
	names are used in temporary file names.  Also, watch out for TMPDIR
	values that are not absolute file names, since they can cause problems
	(e.g., leading "-").

2018-01-03  Jim Meyering  <meyering@fb.com>

	maint: update gnulib and copyright dates for 2018
	* gnulib: Update to latest.
	* bootstrap: Update from gnulib.
	* all files: Run "make update-copyright".

2017-12-16  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

2017-11-24  Paul Eggert  <eggert@cs.ucla.edu>

	maint: zforce and zmore exit status cleanup
	Problem reported by Nelson H. F. Beebe.
	* zforce.in, zmore.in: On failure, exit with status 1 instead of
	with whatever failing status that printf or mv exited with.

2017-11-23  Paul Eggert  <eggert@cs.ucla.edu>

	gzexe: ensure file always exists
	* gzexe.in: When in a filesystem that does not support symlinks,
	use rm+cp rather than mv to make backups, so that the argument
	file always exists.

2017-11-23  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

2017-11-16  Jim Meyering  <meyering@fb.com>

	gzexe: work even without the ability to make a hard link
	* gzexe.in: When ln -f fails to create a "~"-style backup,
	fall back to using mv -f.
	Reported by Bruno Haible in http://debbugs.gnu.org/29266

2017-11-15  Jim Meyering  <meyering@fb.com>

	build: make each generated script unwritable
	* Makefile.am (.in): Ensure that each generated script is unwritable.
	This makes it less likely that someone (even me) will mistakenly
	modify one of those generated files.

2017-11-13  Jim Meyering  <meyering@fb.com>

	zless, znew: exit 1 upon --help or --version write failure
	* zless.in: Exit 1 upon --help or --version write error.
	* znew.in: Likewise.

2017-11-12  Paul Eggert  <eggert@cs.ucla.edu>

	maint: script diagnostics status cleanup
	Problem reported by Bruno Haible (Bug#29266#20).
	* NEWS: Mention this.
	* gunzip.in, gzexe.in, zcat.in, zcmp.in, zdiff.in, zforce.in:
	* zgrep.in, zless.in, zmore.in, znew.in:
	Use printf instead of echo if the argument might contain ‘\’, at
	least in theory.  Don’t assume printf exits with status 1 on
	failure; it might be some other positive status.
	* gzexe.in: Use printf consistently instead of echo, and
	proscribe it instead of echo.

	tests: don’t be so strict about timestamps
	* tests/timestamp: We’ve had many false alarms about timestamps
	that are not gzip problems, but instead are problems with ‘touch’.
	Attempt to work around them by not trusting ‘touch’ so much.
	Problems and parts of solutions proposed by Bruno Haible.

2017-11-10  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2017-11-09  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

	maint: use noreturn, not ATTRIBUTE_NORETURN
	Use gnulib's stdnoreturn module so we can include
	<stdnoreturn.h> and the "noreturn" helper macro, thus
	replacing the definition and uses of ATTRIBUTE_NORETURN.
	* bootstrap.conf (gnulib_modules): Add stdnoreturn.
	* gzip.h (ATTRIBUTE_NORETURN): Remove definition.
	Include stdnoreturn.h and use "noreturn" for each
	ATTRIBUTE_NORETURN-adorned function declaration.
	* gzip.c (do_exit, try_help): Use "noreturn".

	tests: unpack-invalid: correct and clean up a test
	* tests/unpack-invalid: There was a logic error that would have
	caused this test to ignore a failure if first iteration of the
	loop set fail=1 and the second one reset it to 0.  Also, use
	"returns_ 1 ...", to require an exit status of 1.

2017-11-07  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: diagnose out-of-range MTIME
	This seems to be the problem reported by Bruno Haible for GNU/Hurd
	i386 with touch 8.26 and glibc 2.24 (Bug#29033#20).
	* NEWS: Document this.
	* gzip.c (get_method): If MTIME is out of range for
	this platform, warn and substitute the nearest in-range
	value, instead of silently ignoring it.
	(do_list): Remove no-longer-needed test for unknown time stamp.

2017-11-06  Paul Eggert  <eggert@cs.ucla.edu>

	misc: diagnose year-2038 configuration problems
	* bootstrap.conf (gnulib_modules): Add year2038.
	* m4/.gitignore: Add year2038.m4[

	maint: remove IMPORT_FROM_GETTEXT
	* bootstrap.conf (IMPORT_FROM_GETTEXT): Remove.
	This is a relic from older Gnulib, and has no effect now.

2017-10-29  Jim Meyering  <meyering@fb.com>

	tests/unpack-valid: port to printf that do not grok hex
	Many versions of printf do not handle hexadecimal in a format string,
	so this test would fail.
	* tests/init.cfg (hex_printf_): Copied from grep's tests/init.cfg.
	* tests/unpack-valid: Use hex_printf_.
	Reported by Bruno Haible in https://bugs.gnu.org/29033#26

	gnulib: update to latest; also update tests/init.sh from gnulib

	gzip: fix bug with any upper case custom ('-S'-specified) suffix
	Any user-specified suffix with an upper case
	letter would fail to match desired file.
	* gzip.c (get_suffix): First, arrange to have only one return
	point rather than two. Put a lower-cased (just-malloc'd) copy
	of z_suffix in the suffix vector, and free it before returning.
	* tests/upper-suffix: New file.
	* tests/Makefile.am (TESTS): Add it.
	* NEWS: Mention it.
	Reported by meo@xenialab.it in https://bugs.gnu.org/29006

2017-10-16  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: fix bug in unpack EOB check
	Problem reported by Vidar Holen (Bug#28861).
	* NEWS: Mention fix.
	* tests/unpack-valid: New test.
	* tests/Makefile.am (TESTS): Add it.
	* unpack.c (build_tree): Report an error if Huffman tree has
	too few leaves.
	* unpack.c (unpack): Fix check for EOB.
	Remove now-unnecessary check for code out of range.

2017-09-19  Jim Meyering  <meyering@fb.com>

	maint: fix "make syntax-check": remove useless HAVE_UTIME_H definitions
	* tailor.h: Don't define HAVE_UTIME_H.

	maint: avoid "make syntax-check" failure due to old-NEWS modification
	* cfg.mk (old_NEWS_hash): Update, to reflect recent NEWS correction.

2017-09-19  Paul Eggert  <eggert@cs.ucla.edu>

	gzexe: improve usage diagnostic
	* gzexe.in (usage): Reword for clarity (Bug#28514).

	misc: update --version copyright
	* gunzip.in, gzexe.in, gzip.c, zcat.in, zdiff.in, zforce.in, zgrep.in:
	* zless.in, zmore.in, znew.in: Update copyright year in --version
	output to 2017.

	maint: prefer HTTPS to HTTP, FTP in URLs

	maint: copy bootstrap from Gnulib

	maint: port to GCC 7.2
	* configure.ac (WERROR_CFLAGS): Avoid -Wduplicated-branches.
	* tailor.h (FALLTHROUGH): New macro, taken from Emacs.
	* gzip.c (main): Use it.

	maint: update .gitignore for recent Gnulib

	build: update gnulib submodule to latest

2017-05-07  Jim Meyering  <meyering@fb.com>

	maint: also distribute a zip-compressed tarball
	* configure.ac (AM_INIT_AUTOMAKE): Add dist-zip, for
	those lacking gzip, 7zip, etc.  Suggested by Karl Berry in
	https://bugs.gnu.org/25538.

2017-03-13  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: port zdiff, zless to Busybox
	Problem reported by Denys Zagorui (Bug#26088).
	* tests/zdiff: Check that diff uses POSIX-format output.
	* zless.in (less_version): Don't exit merely because 'less -V'
	fails; instead, assume 'less' is compatible with an old version of
	the original 'less'.  Busybox 'less -V' fails, but apparently its
	'less' works anyway somehow.

2017-02-06  Jim Meyering  <meyering@fb.com>

	tests: avoid failure when running with no tty
	* tests/help-version (zcat_setup): Export TERM=dumb, to avoid zless
	malfunction.  Reported by Assaf Gordon in https://bugs.gnu.org/25636#8

	gnulib: update to latest; and tests/init.sh and bootstrap

	maint: change "time stamp" to "timestamp" globally
	This avoids a new syntax-check failure.
	* ChangeLog-2007: Perform that change.
	* NEWS: Likewise.
	* algorithm.doc: Likewise.
	* doc/gzip.texi: Likewise.
	* gunzip.in: Likewise.
	* gzip.1: Likewise.
	* gzip.c: Likewise.
	* gzip.h: Likewise.
	* m4/.gitignore: Likewise.
	* sample/ztouch: Likewise.
	* tests/timestamp: Likewise.
	* unzip.c: Likewise.
	* zip.c: Likewise.
	* znew.1: Likewise.
	* cfg.mk: Update the old news hash accordingly.

2017-01-01  Jim Meyering  <meyering@fb.com>

	maint: tweak a distcheck rule
	* dist-check.mk (my-distcheck): Don't use --disable-nls.
	That option is now unrecognized.

	maint: update gnulib and copyright dates for 2017
	* gnulib: Update to latest.
	* all files: Run "make update-copyright".

2016-11-08  Jim Meyering  <meyering@fb.com>

	maint: use "returns_" rather than explicit comparison with "$?"
	* tests/zdiff: Use "returns_ 1" rather than testing $? = 1.
	* tests/hufts: Likewise.
	* tests/timestamp: Likewise, but s/1/2/.

2016-11-04  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: minor time stamp cleanups
	* NEWS: Document this.
	* gzip.c (get_method): Do not warn about MTIME out of range.
	This should avoid useless chatter on hosts with 32-bit time_t
	after the year 2038 (!).
	(do_list): Do not pass junk time stamp to localtime.
	(copy_stat): Do not report "time stamp restored" if restoration
	fails.

	gzip: --no-time cleanup
	Problem reported by Jim Meyering (Bug#24826).
	* gzip.c (longopts): Remove non-working no-time entry.
	(help) [UNDOCUMENTED]: Don't document it.

	gzip --no-name: avoid spurious warning
	Problem reported by Jim Meyering (Bug#24826).
	* tests/timestamp: Add a test from Jim Meyering to exercise the fix
	* zip.c (zip): Treat unknown time stamps as 0.

2016-10-24  Jim Meyering  <meyering@fb.com>

	maint: update .gitignore files to ignore more generated files

2016-10-02  Jim Meyering  <meyering@fb.com>

	maint: avoid unwarranted "make syntax-check" failure
	* tests/timestamp: Reorder "rm" arguments so the doubled-word
	syntax-check rule does not detect a false positive "in in" here.

	gnulib: update to latest

2016-09-07  Paul Eggert  <eggert@cs.ucla.edu>

	* doc/gzip.texi: Fix off-by-one timestamp.

2016-09-06  Paul Eggert  <eggert@cs.ucla.edu>

	gzip: fix some Y2038 etc. bugs
	* NEWS: Document this.
	* gzip.c (get_method): Warn about out-of-range MTIME,
	and ignore it instead of relying on possibly-undefined behavior.
	* tests/Makefile.am (TESTS): Add timestamp.
	* tests/timestamp: New test.
	* zip.c (zip): Warn about out-of-range file time stamp.

2016-08-29  Jim Meyering  <meyering@fb.com>

	maint: fix gzip-specific syntax-check rule
	* cfg.mk (sc_gzip_copyright_check): This rule had two problems.
	It was failing erroneously (the copyright date in gzip.c is fine),
	yet it was complaining.  The first problem is that the rule's
