diff --git a/ChangeLog b/ChangeLog
index 74c2b8c..5d52edb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,16 +1,8 @@
-2025-01-07  Antonio Diaz Diaz  <antonio@gnu.org>
+2023-12-21  Antonio Diaz Diaz  <antonio@gnu.org>
 
-	* Version 1.14 released.
-	* main.c (decompress): Return 2 if empty member in multimember file.
-	  (Pp_free): New function.
-	* check.sh: Use 'cp' instead of 'cat'.
-
-2024-01-21  Antonio Diaz Diaz  <antonio@gnu.org>
-
-	* Version 1.13 released.
+	* Version 1.13-rc1 released.
 	* main.c: Reformat file diagnostics as 'PROGRAM: FILE: MESSAGE'.
 	  (show_option_error): New function showing argument and option name.
-	  (main): Make -o preserve date/mode/owner if 1 input file.
 	* lzip.h: Rename verify_* to check_*.
 	* configure, Makefile.in: New variable 'MAKEINFO'.
 	* INSTALL: Document use of CFLAGS+='--std=c99 -D_XOPEN_SOURCE=500'.
@@ -46,12 +38,12 @@
 2018-02-04  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.9 released.
-	* New option '--loose-trailing'.
-	* Replace 'bits/byte' with inverse compression ratio in output.
+	* main.c: New option '--loose-trailing'.
 	* main.c (decompress): Improve corrupt header detection to HD=3.
-	  (main): Show final diagnostic when testing multiple files.
-	  (set_c_outname): Do not add a second '.lz' to the arg of '-o'.
-	  (lzip_decode): Show stored sizes also in hex.
+	* Replace 'bits/byte' with inverse compression ratio in output.
+	* main.c: Show final diagnostic when testing multiple files.
+	* main.c: Do not add a second .lz extension to the arg of -o.
+	* main.c (lzip_decode): Show stored sizes also in hex.
 	  Show dictionary size at verbosity level 4 (-vvvv).
 
 2017-04-12  Antonio Diaz Diaz  <antonio@gnu.org>
@@ -65,9 +57,10 @@
 	* Version 1.7 released.
 	* main.c: New option '-a, --trailing-error'.
 	* main.c (main): Delete '--output' file if infd is a terminal.
-	  (main): Don't use stdin more than once.
+	* main.c (main): Don't use stdin more than once.
 	* configure: Avoid warning on some shells when testing for gcc.
-	* check.sh: Require a POSIX shell. Don't check error messages.
+	* check.sh: A POSIX shell is required to run the tests.
+	* check.sh: Don't check error messages.
 
 2015-05-26  Antonio Diaz Diaz  <antonio@gnu.org>
 
@@ -84,16 +77,16 @@
 2013-05-27  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.4 released.
-	* Decompression time has been reduced by 5%.
 	* main.c: New options '-f, --force', '-F, --recompress',
 	  '-k, --keep', and '-o, --output'.
-	  Accept more than one file in command line.
-	  (main): '--test' no longer needs '/dev/null'.
-	  (main): Fix return value of '-d' and '-t' in case of data error.
-	  Change info shown at verbosity levels 2 and 3.
-	  (main): Ignore option '-n, --threads' for compatibility with plzip.
+	* main.c: Accept more than one file in command line.
+	* Decompression time has been reduced by 5%.
+	* main.c: '--test' no longer needs '/dev/null'.
+	* Fix return value of '-d' and '-t' in case of data error.
+	* main.c: Change info shown at verbosity levels 2 and 3.
+	* Ignore option '-n, --threads' for compatibility with plzip.
 	* configure: Options now accept a separate argument.
-	  Rename 'datadir' to 'datarootdir'.
+	* configure: Rename 'datadir' to 'datarootdir'.
 	* Makefile.in: New targets 'install-as-lzip' and 'install-bin'.
 
 2012-01-03  Antonio Diaz Diaz  <ant_diaz@teleline.es>
@@ -101,7 +94,7 @@
 	* Version 1.3 released.
 	* Small change in '--help' output and man page.
 	* Change quote characters in messages as advised by GNU Standards.
-	* main.c (main): Set stdin/stdout in binary mode on OS2.
+	* main.c: Set stdin/stdout in binary mode on OS2.
 
 2011-01-05  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
@@ -125,7 +118,8 @@
 	* Using LZMA SDK 9.10 (public domain) from Igor Pavlov.
 
 
-Copyright (C) 2010-2025 Antonio Diaz Diaz.
+Copyright (C) 2010-2023 Antonio Diaz Diaz.
 
-This file is a collection of facts, and thus it is not copyrightable, but just
-in case, you have unlimited permission to copy, distribute, and modify it.
+This file is a collection of facts, and thus it is not copyrightable,
+but just in case, you have unlimited permission to copy, distribute, and
+modify it.
diff --git a/INSTALL b/INSTALL
index e500eb9..594420c 100644
--- a/INSTALL
+++ b/INSTALL
@@ -3,8 +3,7 @@ Requirements
 You will need a C99 compiler. (gcc 3.3.6 or newer is recommended).
 I use gcc 6.1.0 and 3.3.6, but the code should compile with any standards
 compliant compiler.
-Gcc is available at http://gcc.gnu.org
-Lzip is available at http://www.nongnu.org/lzip/lzip.html
+Gcc is available at http://gcc.gnu.org.
 
 The operating system must allow signal handlers read access to objects with
 static storage duration so that the cleanup handler for Control-C can delete
@@ -75,7 +74,7 @@ After running 'configure', you can run 'make' and 'make install' as
 explained above.
 
 
-Copyright (C) 2010-2025 Antonio Diaz Diaz.
+Copyright (C) 2010-2023 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
 distribute, and modify it.
diff --git a/LzmaDec.c b/LzmaDec.c
index bd2a45a..1236bd3 100644
--- a/LzmaDec.c
+++ b/LzmaDec.c
@@ -716,8 +716,8 @@ static bool LzmaDec_DecodeToDic(CLzmaDec *p, uint32_t dicLimit,
           *status = LZMA_STATUS_NEEDS_MORE_INPUT;
           return true;
         }
-        /* check first byte of the LZMA stream */
-        if (p->tempBuf[0] != 0) return false;
+        if (p->tempBuf[0] != 0)
+          return false;
 
         LzmaDec_InitRc(p, p->tempBuf);
         p->tempBufSize = 0;
diff --git a/Makefile.in b/Makefile.in
index fc59256..4b8c791 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -2,8 +2,8 @@
 DISTNAME = $(pkgname)-$(pkgversion)
 INSTALL = install
 INSTALL_PROGRAM = $(INSTALL) -m 755
-INSTALL_DIR = $(INSTALL) -d -m 755
 INSTALL_DATA = $(INSTALL) -m 644
+INSTALL_DIR = $(INSTALL) -d -m 755
 SHELL = /bin/sh
 CAN_RUN_INSTALLINFO = $(SHELL) -c "install-info --version" > /dev/null 2>&1
 
@@ -30,8 +30,7 @@ main.o : main.c
 
 # prevent 'make' from trying to remake source files
 $(VPATH)/configure $(VPATH)/Makefile.in $(VPATH)/doc/$(pkgname).texi : ;
-MAKEFLAGS += -r
-.SUFFIXES :
+%.h %.c : ;
 
 $(objs)       : Makefile
 carg_parser.o : carg_parser.h
@@ -126,7 +125,8 @@ dist : doc
 	  $(DISTNAME)/testsuite/fox.lz \
 	  $(DISTNAME)/testsuite/fox_*.lz \
 	  $(DISTNAME)/testsuite/test.txt.lz \
-	  $(DISTNAME)/testsuite/test.txt.lzma
+	  $(DISTNAME)/testsuite/test.txt.lzma \
+	  $(DISTNAME)/testsuite/test_em.txt.lz
 	rm -f $(DISTNAME)
 	lzip -v -9 $(DISTNAME).tar
 
diff --git a/NEWS b/NEWS
index e715e5e..5415fd8 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,12 @@
-Changes in version 1.14:
+Changes in version 1.13:
 
-pdlzip now exits with error status 2 if any empty member is found in a
-multimember file.
+File diagnostics have been reformatted as 'PROGRAM: FILE: MESSAGE'.
+
+Diagnostics caused by invalid arguments to command-line options now show the
+argument and the name of the option.
+
+The variable MAKEINFO has been added to configure and Makefile.in.
+
+It has been documented in INSTALL that when choosing a C standard, the POSIX
+features need to be enabled explicitly:
+  ./configure CFLAGS+='--std=c99 -D_XOPEN_SOURCE=500'
diff --git a/README b/README
index 1e4ae50..14f73b7 100644
--- a/README
+++ b/README
@@ -1,31 +1,30 @@
-See the file INSTALL for compilation and installation instructions.
-
 Description
 
 Pdlzip is a permissively licensed implementation of the lzip data
 compressor, intended for those who can't distribute (or even use) GPL
 licensed Free Software. The name of pdlzip comes from 'public domain lzip'.
-Pdlzip is written in C.
+Pdlzip is written in C and is (hope)fully compatible with lzip 1.4 or newer.
 
 Lzip is a lossless data compressor with a user interface similar to the one
-of gzip or bzip2. Lzip uses a simplified form of LZMA (Lempel-Ziv-Markov
-chain-Algorithm) designed to achieve complete interoperability between
-implementations. The maximum dictionary size is 512 MiB so that any lzip
-file can be decompressed on 32-bit machines. Lzip provides accurate and
-robust 3-factor integrity checking. 'lzip -0' compresses about as fast as
-gzip, while 'lzip -9' compresses most files more than bzip2. Decompression
-speed is intermediate between gzip and bzip2. Lzip provides better data
-recovery capabilities than gzip and bzip2. Lzip has been designed, written,
-and tested with great care to replace gzip and bzip2 as general-purpose
-compressed format for Unix-like systems.
+of gzip or bzip2. Lzip uses a simplified form of the 'Lempel-Ziv-Markov
+chain-Algorithm' (LZMA) stream format to maximize interoperability. The
+maximum dictionary size is 512 MiB so that any lzip file can be decompressed
+on 32-bit machines. Lzip provides accurate and robust 3-factor integrity
+checking. Lzip can compress about as fast as gzip (lzip -0) or compress most
+files more than bzip2 (lzip -9). Decompression speed is intermediate between
+gzip and bzip2. Lzip is better than gzip and bzip2 from a data recovery
+perspective. Lzip has been designed, written, and tested with great care to
+replace gzip and bzip2 as the standard general-purpose compressed format for
+Unix-like systems.
 
 The lzip file format is designed for data sharing and long-term archiving,
 taking into account both data integrity and decoder availability:
 
-   * The program lziprecover can repair bit flip errors (one of the most
-     common forms of data corruption) in lzip files, and provides data
-     recovery capabilities, including error-checked merging of damaged
-     copies of a file.
+   * The lzip format provides very safe integrity checking and some data
+     recovery means. The program lziprecover can repair bit flip errors
+     (one of the most common forms of data corruption) in lzip files, and
+     provides data recovery capabilities, including error-checked merging
+     of damaged copies of a file.
 
    * The lzip format is as simple as possible (but not simpler). The lzip
      manual provides the source code of a simple decompressor along with a
@@ -51,14 +50,18 @@ without recompressing.
 Pdlzip includes public domain compression/decompression code from the LZMA
 SDK (Software Development Kit) written by Igor Pavlov.
 
-Pdlzip uses Arg_parser for command-line argument parsing:
-http://www.nongnu.org/arg-parser/arg_parser.html
+I would not write non-copylefted software unless it is too simple to be
+worth copylefting it, but one of the uses of the lzip format is the
+interchange of information, and it is therefore desirable that even the
+users of the most non-free platforms can share lzip files with everybody
+else.
 
 
-Copyright (C) 2010-2025 Antonio Diaz Diaz.
+Copyright (C) 2010-2023 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
 distribute, and modify it.
 
-The file Makefile.in is a data file used by configure to produce the Makefile.
-It has the same copyright owner and permissions that configure itself.
+The file Makefile.in is a data file used by configure to produce the
+Makefile. It has the same copyright owner and permissions that configure
+itself.
diff --git a/carg_parser.c b/carg_parser.c
index 20b8a16..8882b97 100644
--- a/carg_parser.c
+++ b/carg_parser.c
@@ -1,5 +1,5 @@
 /* Arg_parser - POSIX/GNU command-line argument parser. (C version)
-   Copyright (C) 2006-2025 Antonio Diaz Diaz.
+   Copyright (C) 2006-2023 Antonio Diaz Diaz.
 
    This library is free software. Redistribution and use in source and
    binary forms, with or without modification, are permitted provided
@@ -32,15 +32,15 @@ static void * ap_resize_buffer( void * buf, const int min_size )
   }
 
 
-static char push_back_record( Arg_parser * const ap, const int code,
+static char push_back_record( struct Arg_parser * const ap, const int code,
                               const char * const long_name,
                               const char * const argument )
   {
-  ap_Record * p;
+  struct ap_Record * p;
   void * tmp = ap_resize_buffer( ap->data,
-                                 ( ap->data_size + 1 ) * sizeof (ap_Record) );
+                 ( ap->data_size + 1 ) * sizeof (struct ap_Record) );
   if( !tmp ) return 0;
-  ap->data = (ap_Record *)tmp;
+  ap->data = (struct ap_Record *)tmp;
   p = &(ap->data[ap->data_size]);
   p->code = code;
   if( long_name )
@@ -71,7 +71,7 @@ static char push_back_record( Arg_parser * const ap, const int code,
   }
 
 
-static char add_error( Arg_parser * const ap, const char * const msg )
+static char add_error( struct Arg_parser * const ap, const char * const msg )
   {
   const int len = strlen( msg );
   void * tmp = ap_resize_buffer( ap->error, ap->error_size + len + 1 );
@@ -83,7 +83,7 @@ static char add_error( Arg_parser * const ap, const char * const msg )
   }
 
 
-static void free_data( Arg_parser * const ap )
+static void free_data( struct Arg_parser * const ap )
   {
   int i;
   for( i = 0; i < ap->data_size; ++i )
@@ -94,9 +94,10 @@ static void free_data( Arg_parser * const ap )
 
 
 /* Return 0 only if out of memory. */
-static char parse_long_option( Arg_parser * const ap,
+static char parse_long_option( struct Arg_parser * const ap,
                                const char * const opt, const char * const arg,
-                               const ap_Option options[], int * const argindp )
+                               const struct ap_Option options[],
+                               int * const argindp )
   {
   unsigned len;
   int index = -1, i;
@@ -147,21 +148,21 @@ static char parse_long_option( Arg_parser * const ap,
       add_error( ap, "' requires an argument" );
       return 1;
       }
-    return push_back_record( ap, options[index].code, options[index].long_name,
-                             &opt[len+3] );	/* argument may be empty */
+    return push_back_record( ap, options[index].code,
+                             options[index].long_name, &opt[len+3] );
     }
 
-  if( options[index].has_arg == ap_yes || options[index].has_arg == ap_yme )
+  if( options[index].has_arg == ap_yes )
     {
-    if( !arg || ( options[index].has_arg == ap_yes && !arg[0] ) )
+    if( !arg || !arg[0] )
       {
       add_error( ap, "option '--" ); add_error( ap, options[index].long_name );
       add_error( ap, "' requires an argument" );
       return 1;
       }
     ++*argindp;
-    return push_back_record( ap, options[index].code, options[index].long_name,
-                             arg );	/* argument may be empty */
+    return push_back_record( ap, options[index].code,
+                             options[index].long_name, arg );
     }
 
   return push_back_record( ap, options[index].code,
@@ -170,9 +171,10 @@ static char parse_long_option( Arg_parser * const ap,
 
 
 /* Return 0 only if out of memory. */
-static char parse_short_option( Arg_parser * const ap,
+static char parse_short_option( struct Arg_parser * const ap,
                                 const char * const opt, const char * const arg,
-                                const ap_Option options[], int * const argindp )
+                                const struct ap_Option options[],
+                                int * const argindp )
   {
   int cind = 1;			/* character index in opt */
 
@@ -202,15 +204,15 @@ static char parse_short_option( Arg_parser * const ap,
       if( !push_back_record( ap, c, 0, &opt[cind] ) ) return 0;
       ++*argindp; cind = 0;
       }
-    else if( options[index].has_arg == ap_yes || options[index].has_arg == ap_yme )
+    else if( options[index].has_arg == ap_yes )
       {
-      if( !arg || ( options[index].has_arg == ap_yes && !arg[0] ) )
+      if( !arg || !arg[0] )
         {
         add_error( ap, "option requires an argument -- '" );
         add_error( ap, code_str ); add_error( ap, "'" );
         return 1;
         }
-      ++*argindp; cind = 0;		/* argument may be empty */
+      ++*argindp; cind = 0;
       if( !push_back_record( ap, c, 0, arg ) ) return 0;
       }
     else if( !push_back_record( ap, c, 0, 0 ) ) return 0;
@@ -219,9 +221,9 @@ static char parse_short_option( Arg_parser * const ap,
   }
 
 
-char ap_init( Arg_parser * const ap,
+char ap_init( struct Arg_parser * const ap,
               const int argc, const char * const argv[],
-              const ap_Option options[], const char in_order )
+              const struct ap_Option options[], const char in_order )
   {
   const char ** non_options = 0;	/* skipped non-options */
   int non_options_size = 0;		/* number of skipped non-options */
@@ -280,7 +282,7 @@ out: if( non_options ) free( non_options );
   }
 
 
-void ap_free( Arg_parser * const ap )
+void ap_free( struct Arg_parser * const ap )
   {
   free_data( ap );
   if( ap->error ) { free( ap->error ); ap->error = 0; }
@@ -288,25 +290,29 @@ void ap_free( Arg_parser * const ap )
   }
 
 
-const char * ap_error( const Arg_parser * const ap ) { return ap->error; }
+const char * ap_error( const struct Arg_parser * const ap )
+  { return ap->error; }
 
-int ap_arguments( const Arg_parser * const ap ) { return ap->data_size; }
 
-int ap_code( const Arg_parser * const ap, const int i )
+int ap_arguments( const struct Arg_parser * const ap )
+  { return ap->data_size; }
+
+
+int ap_code( const struct Arg_parser * const ap, const int i )
   {
   if( i < 0 || i >= ap_arguments( ap ) ) return 0;
   return ap->data[i].code;
   }
 
 
-const char * ap_parsed_name( const Arg_parser * const ap, const int i )
+const char * ap_parsed_name( const struct Arg_parser * const ap, const int i )
   {
   if( i < 0 || i >= ap_arguments( ap ) || !ap->data[i].parsed_name ) return "";
   return ap->data[i].parsed_name;
   }
 
 
-const char * ap_argument( const Arg_parser * const ap, const int i )
+const char * ap_argument( const struct Arg_parser * const ap, const int i )
   {
   if( i < 0 || i >= ap_arguments( ap ) || !ap->data[i].argument ) return "";
   return ap->data[i].argument;
diff --git a/carg_parser.h b/carg_parser.h
index 28eabee..ec5d3d0 100644
--- a/carg_parser.h
+++ b/carg_parser.h
@@ -1,5 +1,5 @@
 /* Arg_parser - POSIX/GNU command-line argument parser. (C version)
-   Copyright (C) 2006-2025 Antonio Diaz Diaz.
+   Copyright (C) 2006-2023 Antonio Diaz Diaz.
 
    This library is free software. Redistribution and use in source and
    binary forms, with or without modification, are permitted provided
@@ -37,65 +37,60 @@
    The argument '--' terminates all options; any following arguments are
    treated as non-option arguments, even if they begin with a hyphen.
 
-   The syntax of options with an optional argument is
-   '-<short_option><argument>' (without whitespace), or
-   '--<long_option>=<argument>'.
-
-   The syntax of options with an empty argument is '-<short_option> ""',
-   '--<long_option> ""', or '--<long_option>=""'.
+   The syntax for optional option arguments is '-<short_option><argument>'
+   (without whitespace), or '--<long_option>=<argument>'.
 */
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-/* ap_yme = yes but maybe empty */
-typedef enum ap_Has_arg { ap_no, ap_yes, ap_maybe, ap_yme } ap_Has_arg;
+enum ap_Has_arg { ap_no, ap_yes, ap_maybe };
 
-typedef struct ap_Option
+struct ap_Option
   {
   int code;			/* Short option letter or code ( code != 0 ) */
   const char * long_name;	/* Long option name (maybe null) */
-  ap_Has_arg has_arg;
-  } ap_Option;
+  enum ap_Has_arg has_arg;
+  };
 
 
-typedef struct ap_Record
+struct ap_Record
   {
   int code;
   char * parsed_name;
   char * argument;
-  } ap_Record;
+  };
 
 
-typedef struct Arg_parser
+struct Arg_parser
   {
-  ap_Record * data;
+  struct ap_Record * data;
   char * error;
   int data_size;
   int error_size;
-  } Arg_parser;
+  };
 
 
-char ap_init( Arg_parser * const ap,
+char ap_init( struct Arg_parser * const ap,
               const int argc, const char * const argv[],
-              const ap_Option options[], const char in_order );
+              const struct ap_Option options[], const char in_order );
 
-void ap_free( Arg_parser * const ap );
+void ap_free( struct Arg_parser * const ap );
 
-const char * ap_error( const Arg_parser * const ap );
+const char * ap_error( const struct Arg_parser * const ap );
 
 /* The number of arguments parsed. May be different from argc. */
-int ap_arguments( const Arg_parser * const ap );
+int ap_arguments( const struct Arg_parser * const ap );
 
 /* If ap_code( i ) is 0, ap_argument( i ) is a non-option.
    Else ap_argument( i ) is the option's argument (or empty). */
-int ap_code( const Arg_parser * const ap, const int i );
+int ap_code( const struct Arg_parser * const ap, const int i );
 
 /* Full name of the option parsed (short or long). */
-const char * ap_parsed_name( const Arg_parser * const ap, const int i );
+const char * ap_parsed_name( const struct Arg_parser * const ap, const int i );
 
-const char * ap_argument( const Arg_parser * const ap, const int i );
+const char * ap_argument( const struct Arg_parser * const ap, const int i );
 
 #ifdef __cplusplus
 }
diff --git a/configure b/configure
index 4f3fdd2..1f8c60f 100755
--- a/configure
+++ b/configure
@@ -1,12 +1,12 @@
 #! /bin/sh
 # configure script for Pdlzip - LZMA lossless data compressor
-# Copyright (C) 2010-2025 Antonio Diaz Diaz.
+# Copyright (C) 2010-2023 Antonio Diaz Diaz.
 #
 # This configure script is free software: you have unlimited permission
 # to copy, distribute, and modify it.
 
 pkgname=pdlzip
-pkgversion=1.14
+pkgversion=1.13-rc1
 progname=pdlzip
 srctrigger=doc/${progname}.1
 
@@ -109,7 +109,7 @@ while [ $# != 0 ] ; do
 		exit 1 ;;
 	esac
 
-	# Check whether the option took a separate argument
+	# Check if the option took a separate argument
 	if [ "${arg2}" = yes ] ; then
 		if [ $# != 0 ] ; then args="${args} \"$1\"" ; shift
 		else echo "configure: Missing argument to '${option}'" 1>&2
@@ -171,7 +171,7 @@ echo "MAKEINFO = ${MAKEINFO}"
 rm -f Makefile
 cat > Makefile << EOF
 # Makefile for Pdlzip - LZMA lossless data compressor
-# Copyright (C) 2010-2025 Antonio Diaz Diaz.
+# Copyright (C) 2010-2023 Antonio Diaz Diaz.
 # This file was generated automatically by configure. Don't edit.
 #
 # This Makefile is free software: you have unlimited permission
diff --git a/debian/changelog b/debian/changelog
index bf322b7..ea827f9 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,33 +1,3 @@
-pdlzip (1.14-1) sid; urgency=medium
-
-  * Uploading to sid.
-  * Merging upstream version 1.14.
-  * Correcting public-domain identifier in copyright.
-
- -- Daniel Baumann <daniel.baumann@progress-linux.org>  Tue, 14 Jan 2025 11:06:12 +0100
-
-pdlzip (1.14~rc1-1) sid; urgency=medium
-
-  * Uploading to sid.
-  * Merging upstream version 1.14~rc1.
-
- -- Daniel Baumann <daniel.baumann@progress-linux.org>  Sun, 10 Nov 2024 09:40:36 +0100
-
-pdlzip (1.13-2) sid; urgency=medium
-
-  * Uploading to sid.
-  * Updating to standards-version 4.7.0.
-
- -- Daniel Baumann <daniel.baumann@progress-linux.org>  Thu, 25 Jul 2024 06:44:16 +0200
-
-pdlzip (1.13-1) sid; urgency=medium
-
-  * Uploading to sid.
-  * Merging upstream version 1.13.
-  * Updating years in copyright for 2024.
-
- -- Daniel Baumann <daniel.baumann@progress-linux.org>  Wed, 31 Jan 2024 06:33:48 +0100
-
 pdlzip (1.13~rc1-1) sid; urgency=medium
 
   * Uploading to sid.
diff --git a/debian/control b/debian/control
index cb4e339..3b7beea 100644
--- a/debian/control
+++ b/debian/control
@@ -5,7 +5,7 @@ Maintainer: Daniel Baumann <daniel.baumann@progress-linux.org>
 Build-Depends:
  debhelper-compat (= 13),
 Rules-Requires-Root: no
-Standards-Version: 4.7.0
+Standards-Version: 4.6.2
 Homepage: http://www.nongnu.org/lzip/pdlzip.html
 Vcs-Browser: https://git.progress-linux.org/users/daniel.baumann/debian/packages/pdlzip
 Vcs-Git: https://git.progress-linux.org/users/daniel.baumann/debian/packages/pdlzip
diff --git a/debian/copyright b/debian/copyright
index e3a99c2..e433c95 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -4,12 +4,12 @@ Upstream-Contact: lzip-bug@nongnu.org
 Source: https://download.savannah.gnu.org/releases/lzip/
 
 Files: *
-Copyright: 2010-2024 Antonio Diaz Diaz <ant_diaz@teleline.es>
+Copyright: 2010-2022 Antonio Diaz Diaz <ant_diaz@teleline.es>
            Igor Pavlov
-License: public-domain
+License: PD
 
 Files: debian/*
-Copyright: 2009-2024 Daniel Baumann <daniel.baumann@progress-linux.org>
+Copyright: 2009-2022 Daniel Baumann <daniel.baumann@progress-linux.org>
 License: BSD-2
 
 License: BSD-2
diff --git a/doc/pdlzip.1 b/doc/pdlzip.1
index 81ab168..0e3e384 100644
--- a/doc/pdlzip.1
+++ b/doc/pdlzip.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.49.2.
-.TH PDLZIP "1" "January 2025" "pdlzip 1.14" "User Commands"
+.TH PDLZIP "1" "December 2023" "pdlzip 1.13-rc1" "User Commands"
 .SH NAME
 pdlzip \- reduces the size of files
 .SH SYNOPSIS
@@ -9,19 +9,19 @@ pdlzip \- reduces the size of files
 Pdlzip is a permissively licensed implementation of the lzip data
 compressor, intended for those who can't distribute (or even use) GPL
 licensed Free Software. The name of pdlzip comes from 'public domain lzip'.
-Pdlzip is written in C.
+Pdlzip is written in C and is (hope)fully compatible with lzip 1.4 or newer.
 .PP
 Lzip is a lossless data compressor with a user interface similar to the one
-of gzip or bzip2. Lzip uses a simplified form of LZMA (Lempel\-Ziv\-Markov
-chain\-Algorithm) designed to achieve complete interoperability between
-implementations. The maximum dictionary size is 512 MiB so that any lzip
-file can be decompressed on 32\-bit machines. Lzip provides accurate and
-robust 3\-factor integrity checking. 'lzip \fB\-0\fR' compresses about as fast as
-gzip, while 'lzip \fB\-9\fR' compresses most files more than bzip2. Decompression
-speed is intermediate between gzip and bzip2. Lzip provides better data
-recovery capabilities than gzip and bzip2. Lzip has been designed, written,
-and tested with great care to replace gzip and bzip2 as general\-purpose
-compressed format for Unix\-like systems.
+of gzip or bzip2. Lzip uses a simplified form of the 'Lempel\-Ziv\-Markov
+chain\-Algorithm' (LZMA) stream format to maximize interoperability. The
+maximum dictionary size is 512 MiB so that any lzip file can be decompressed
+on 32\-bit machines. Lzip provides accurate and robust 3\-factor integrity
+checking. Lzip can compress about as fast as gzip (lzip \fB\-0\fR) or compress most
+files more than bzip2 (lzip \fB\-9\fR). Decompression speed is intermediate between
+gzip and bzip2. Lzip is better than gzip and bzip2 from a data recovery
+perspective. Lzip has been designed, written, and tested with great care to
+replace gzip and bzip2 as the standard general\-purpose compressed format for
+Unix\-like systems.
 .PP
 Pdlzip is also able to decompress legacy lzma\-alone (.lzma) files.
 Lzma\-alone is a very bad format; it is essentially a raw LZMA stream.
@@ -112,7 +112,7 @@ Report bugs to lzip\-bug@nongnu.org
 .br
 Pdlzip home page: http://www.nongnu.org/lzip/pdlzip.html
 .SH COPYRIGHT
-Copyright \(co 2025 Antonio Diaz Diaz.
+Copyright \(co 2023 Antonio Diaz Diaz.
 Public Domain 2009 Igor Pavlov.
 License 2\-clause BSD.
 .br
diff --git a/lzip.h b/lzip.h
index 7dc9ee3..7e7805a 100644
--- a/lzip.h
+++ b/lzip.h
@@ -1,5 +1,5 @@
 /* Pdlzip - LZMA lossless data compressor
-   Copyright (C) 2010-2025 Antonio Diaz Diaz.
+   Copyright (C) 2010-2023 Antonio Diaz Diaz.
 
    This program is free software. Redistribution and use in source and
    binary forms, with or without modification, are permitted provided
@@ -188,22 +188,11 @@ static inline void Lt_set_member_size( Lzip_trailer data, unsigned long long sz
   { int i; for( i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } }
 
 
-typedef struct Cl_options	/* command-line options */
-  {
-  bool ignore_trailing;
-  bool loose_trailing;
-  } Cl_options;
-
-static inline void Cl_options_init( Cl_options * cl_opts )
-  { cl_opts->ignore_trailing = true; cl_opts->loose_trailing = false; }
-
-
 static inline void set_retval( int * retval, const int new_val )
   { if( *retval < new_val ) *retval = new_val; }
 
-static const char * const empty_msg = "Empty member not allowed.";
-static const char * const mem_msg = "Not enough memory.";
 static const char * const trailing_msg = "Trailing data not allowed.";
+static const char * const mem_msg = "Not enough memory.";
 
 /* defined in main.c */
 extern int verbosity;
diff --git a/main.c b/main.c
index f224942..0d3b659 100644
--- a/main.c
+++ b/main.c
@@ -1,6 +1,6 @@
 /* Pdlzip - LZMA lossless data compressor
    2009-08-14 : Igor Pavlov : Public domain
-   Copyright (C) 2010-2025 Antonio Diaz Diaz.
+   Copyright (C) 2010-2023 Antonio Diaz Diaz.
 
    This program is free software. Redistribution and use in source and
    binary forms, with or without modification, are permitted provided
@@ -28,7 +28,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
-#include <limits.h>		/* CHAR_BIT, SSIZE_MAX */
+#include <limits.h>		/* SSIZE_MAX */
 #include <signal.h>
 #include <stdbool.h>
 #include <stdint.h>		/* SIZE_MAX */
@@ -85,7 +85,7 @@ static void show_file_error( const char * const filename,
 static void internal_error( const char * const msg );
 
 static const char * const program_name = "pdlzip";
-static const char * const program_year = "2025";
+static const char * const program_year = "2023";
 static const char * invocation_name = "pdlzip";		/* default value */
 
 static const struct { const char * from; const char * to; } known_extensions[] = {
@@ -94,13 +94,13 @@ static const struct { const char * from; const char * to; } known_extensions[] =
   { ".lzma", ""     },
   { 0,       0      } };
 
-typedef struct Lzma_options
+struct Lzma_options
   {
   int dictionary_size;		/* 4 KiB .. 512 MiB */
   int match_len_limit;		/* 5 .. 273 */
-  } Lzma_options;
+  };
 
-typedef enum Mode { m_compress, m_decompress, m_test } Mode;
+enum Mode { m_compress, m_decompress, m_test };
 
 /* Variables used in signal handler context.
    They are not declared volatile because the handler never returns. */
@@ -114,18 +114,18 @@ static void show_help( void )
   printf( "Pdlzip is a permissively licensed implementation of the lzip data\n"
           "compressor, intended for those who can't distribute (or even use) GPL\n"
           "licensed Free Software. The name of pdlzip comes from 'public domain lzip'.\n"
-          "Pdlzip is written in C.\n"
+          "Pdlzip is written in C and is (hope)fully compatible with lzip 1.4 or newer.\n"
           "\nLzip is a lossless data compressor with a user interface similar to the one\n"
-          "of gzip or bzip2. Lzip uses a simplified form of LZMA (Lempel-Ziv-Markov\n"
-          "chain-Algorithm) designed to achieve complete interoperability between\n"
-          "implementations. The maximum dictionary size is 512 MiB so that any lzip\n"
-          "file can be decompressed on 32-bit machines. Lzip provides accurate and\n"
-          "robust 3-factor integrity checking. 'lzip -0' compresses about as fast as\n"
-          "gzip, while 'lzip -9' compresses most files more than bzip2. Decompression\n"
-          "speed is intermediate between gzip and bzip2. Lzip provides better data\n"
-          "recovery capabilities than gzip and bzip2. Lzip has been designed, written,\n"
-          "and tested with great care to replace gzip and bzip2 as general-purpose\n"
-          "compressed format for Unix-like systems.\n"
+          "of gzip or bzip2. Lzip uses a simplified form of the 'Lempel-Ziv-Markov\n"
+          "chain-Algorithm' (LZMA) stream format to maximize interoperability. The\n"
+          "maximum dictionary size is 512 MiB so that any lzip file can be decompressed\n"
+          "on 32-bit machines. Lzip provides accurate and robust 3-factor integrity\n"
+          "checking. Lzip can compress about as fast as gzip (lzip -0) or compress most\n"
+          "files more than bzip2 (lzip -9). Decompression speed is intermediate between\n"
+          "gzip and bzip2. Lzip is better than gzip and bzip2 from a data recovery\n"
+          "perspective. Lzip has been designed, written, and tested with great care to\n"
+          "replace gzip and bzip2 as the standard general-purpose compressed format for\n"
+          "Unix-like systems.\n"
           "\nPdlzip is also able to decompress legacy lzma-alone (.lzma) files.\n"
           "Lzma-alone is a very bad format; it is essentially a raw LZMA stream.\n"
           "If you keep any lzma-alone files, it is advisable to recompress them to\n"
@@ -196,16 +196,16 @@ static void * resize_buffer( void * buf, const unsigned min_size )
   }
 
 
-typedef struct Pretty_print
+struct Pretty_print
   {
   const char * name;
   char * padded_name;
   const char * stdin_name;
   unsigned longest_name;
   bool first_post;
-  } Pretty_print;
+  };
 
-static void Pp_init( Pretty_print * const pp,
+static void Pp_init( struct Pretty_print * const pp,
                      const char * const filenames[], const int num_filenames )
   {
   pp->name = 0;
@@ -226,10 +226,8 @@ static void Pp_init( Pretty_print * const pp,
   if( pp->longest_name == 0 ) pp->longest_name = stdin_name_len;
   }
 
-void Pp_free( Pretty_print * const pp )
-  { if( pp->padded_name ) { free( pp->padded_name ); pp->padded_name = 0; } }
-
-static void Pp_set_name( Pretty_print * const pp, const char * const filename )
+static void Pp_set_name( struct Pretty_print * const pp,
+                         const char * const filename )
   {
   unsigned name_len, padded_name_len, i = 0;
 
@@ -247,10 +245,10 @@ static void Pp_set_name( Pretty_print * const pp, const char * const filename )
   pp->first_post = true;
   }
 
-static void Pp_reset( Pretty_print * const pp )
+static void Pp_reset( struct Pretty_print * const pp )
   { if( pp->name && pp->name[0] ) pp->first_post = true; }
 
-static void Pp_show_msg( Pretty_print * const pp, const char * const msg )
+static void Pp_show_msg( struct Pretty_print * const pp, const char * const msg )
   {
   if( verbosity < 0 ) return;
   if( pp->first_post )
@@ -270,7 +268,7 @@ static void show_header( const unsigned dictionary_size )
   const char * p = "";
   const char * np = "  ";
   unsigned num = dictionary_size;
-  bool exact = num % factor == 0;
+  bool exact = ( num % factor == 0 );
 
   int i; for( i = 0; i < n && ( num > 9999 || ( exact && num >= factor ) ); ++i )
     { num /= factor; if( num % factor != 0 ) exact = false;
@@ -291,7 +289,7 @@ static const char * format_num3( unsigned long long num )
   char * const buf = buffer[current++]; current %= buffers;
   char * p = buf + bufsize - 1;		/* fill the buffer backwards */
   *p = 0;	/* terminator */
-  if( num > 9999 )
+  if( num > 1024 )
     {
     char prefix = 0;			/* try binary first, then si */
     for( i = 0; i < n && num != 0 && num % 1024 == 0; ++i )
@@ -337,7 +335,7 @@ static unsigned long getnum( const char * const arg,
 
   if( !errno && tail[0] )
     {
-    const unsigned factor = (tail[1] == 'i') ? 1024 : 1000;
+    const unsigned factor = ( tail[1] == 'i' ) ? 1024 : 1000;
     int exponent = 0;				/* 0 = bad multiplier */
     int i;
     switch( tail[0] )
@@ -387,7 +385,7 @@ static int get_dict_size( const char * const arg, const char * const option_name
   }
 
 
-static void set_mode( Mode * const program_modep, const Mode new_mode )
+static void set_mode( enum Mode * const program_modep, const enum Mode new_mode )
   {
   if( *program_modep != m_compress && *program_modep != new_mode )
     {
@@ -454,13 +452,13 @@ static void set_d_outname( const char * const name, const int eindex )
 
 
 static int open_instream( const char * const name, struct stat * const in_statsp,
-                          const Mode program_mode, const int eindex,
+                          const enum Mode program_mode, const int eindex,
                           const bool one_to_one, const bool recompress )
   {
   if( program_mode == m_compress && !recompress && eindex >= 0 )
     {
     if( verbosity >= 0 )
-      fprintf( stderr, "%s: %s: Input file already has '%s' suffix, ignored.\n",
+      fprintf( stderr, "%s: %s: Input file already has '%s' suffix.\n",
                program_name, name, known_extensions[eindex].from );
     return -1;
     }
@@ -471,9 +469,9 @@ static int open_instream( const char * const name, struct stat * const in_statsp
     {
     const int i = fstat( infd, in_statsp );
     const mode_t mode = in_statsp->st_mode;
-    const bool can_read = i == 0 &&
-                          ( S_ISBLK( mode ) || S_ISCHR( mode ) ||
-                            S_ISFIFO( mode ) || S_ISSOCK( mode ) );
+    const bool can_read = ( i == 0 &&
+                            ( S_ISBLK( mode ) || S_ISCHR( mode ) ||
+                              S_ISFIFO( mode ) || S_ISSOCK( mode ) ) );
     if( i != 0 || ( !S_ISREG( mode ) && ( !can_read || one_to_one ) ) )
       {
       if( verbosity >= 0 )
@@ -539,7 +537,7 @@ static void signal_handler( int sig )
 
 
 static bool check_tty_in( const char * const input_filename, const int infd,
-                          const Mode program_mode, int * const retval )
+                          const enum Mode program_mode, int * const retval )
   {
   if( ( program_mode == m_decompress || program_mode == m_test ) &&
       isatty( infd ) )				/* for example /dev/tty */
@@ -551,7 +549,7 @@ static bool check_tty_in( const char * const input_filename, const int infd,
   return true;
   }
 
-static bool check_tty_out( const Mode program_mode )
+static bool check_tty_out( const enum Mode program_mode )
   {
   if( program_mode == m_compress && isatty( outfd ) )
     { show_file_error( output_filename[0] ?
@@ -569,7 +567,7 @@ static void close_and_set_permissions( const struct stat * const in_statsp )
   if( in_statsp )
     {
     const mode_t mode = in_statsp->st_mode;
-    /* fchown in many cases returns with EPERM, which can be safely ignored. */
+    /* fchown will in many cases return with EPERM, which can be safely ignored. */
     if( fchown( outfd, in_statsp->st_uid, in_statsp->st_gid ) == 0 )
       { if( fchmod( outfd, mode ) != 0 ) warning = true; }
     else
@@ -595,9 +593,8 @@ static void close_and_set_permissions( const struct stat * const in_statsp )
   }
 
 
-static int compress( const int infd,
-                     const Lzma_options * const encoder_options,
-                     Pretty_print * const pp )
+static int compress( const int infd, const struct Lzma_options * const
+                     encoder_options, struct Pretty_print * const pp )
   {
   int retval = 0;
   CLzmaEncHandle encoder = 0;
@@ -619,7 +616,7 @@ static int compress( const int infd,
     }
 
   if( writeblock( outfd, header, Lh_size ) != Lh_size )
-    { show_error( "Write error", errno, false ); retval = 1; }
+    { show_error( "Can't write output file", errno, false ); retval = 1; }
   else
     if( LzmaEnc_Encode( encoder ) != 0 )
       { Pp_show_msg( pp, "Encoder error." ); retval = 1; }
@@ -687,7 +684,7 @@ static int lzma_decode( uint64_t unpackSize, CLzmaDec *decoder, const int infd,
   unsigned long long member_size = lzma_header_size, data_size = 0;
   uint8_t outBuf[OUT_BUF_SIZE];
   int outPos = 0;
-  const bool thereIsSize = unpackSize != (uint64_t)-1;
+  const bool thereIsSize = (unpackSize != (uint64_t)-1);
 
   for (;;)
     {
@@ -714,7 +711,7 @@ static int lzma_decode( uint64_t unpackSize, CLzmaDec *decoder, const int infd,
     unpackSize -= outProcessed;
 
     if( outfd >= 0 && writeblock( outfd, outBuf, outPos ) != outPos )
-      { show_error( "Write error", errno, false ); return 1; }
+      { show_error( "Can't write output file", errno, false ); return 1; }
 
     data_size += outPos;
     outPos = 0;
@@ -734,10 +731,10 @@ static int lzma_decode( uint64_t unpackSize, CLzmaDec *decoder, const int infd,
   }
 
 
-static int lzip_decode( CLzmaDec * decoder, const int infd,
-                        Pretty_print * const pp, uint8_t inBuf[],
+static int lzip_decode( CLzmaDec *decoder, const int infd,
+                        struct Pretty_print * const pp, uint8_t inBuf[],
                         int * const inPos, int * const inSize,
-                        const unsigned dictionary_size, bool * const data0p )
+                        const unsigned dictionary_size )
   {
   unsigned long long member_size = Lh_size, data_size = 0;
   uint8_t outBuf[OUT_BUF_SIZE];
@@ -765,7 +762,7 @@ static int lzip_decode( CLzmaDec * decoder, const int infd,
     outPos += outProcessed;
 
     if( outfd >= 0 && writeblock( outfd, outBuf, outPos ) != outPos )
-      { show_error( "Write error", errno, false ); return 1; }
+      { show_error( "Can't write output file", errno, false ); return 1; }
 
     CRC32_update_buf( &crc, outBuf, outPos );
     data_size += outPos;
@@ -833,16 +830,15 @@ static int lzip_decode( CLzmaDec * decoder, const int infd,
         }
       if( error ) return 2;
       show_results( data_size, member_size, td_crc, dictionary_size, true );
-      *data0p = data_size == 0;
       return 0;
       }
     }
   }
 
 
-static int decompress( const int infd, const Cl_options * const cl_opts,
-                       Pretty_print * const pp,
-                       const bool from_stdin, const bool testing )
+static int decompress( const int infd, struct Pretty_print * const pp,
+                       const bool ignore_trailing, const bool loose_trailing,
+                       const bool testing )
   {
   uint64_t unpackSize = 0;
   CLzmaDec decoder;
@@ -852,7 +848,6 @@ static int decompress( const int infd, const Cl_options * const cl_opts,
   bool lzip_mode = true;
   bool first_member;
   uint8_t raw_props[lzma_header_size];
-  bool empty = false, multi = false;
 
   for( first_member = true; ; first_member = false )
     {
@@ -872,7 +867,7 @@ static int decompress( const int infd, const Cl_options * const cl_opts,
       else if( Lh_check_prefix( header, size ) )
         { Pp_show_msg( pp, "Truncated header in multimember file." );
           retval = 2; }
-      else if( size > 0 && !cl_opts->ignore_trailing )
+      else if( size > 0 && !ignore_trailing )
         { Pp_show_msg( pp, trailing_msg ); retval = 2; }
       break;
       }
@@ -880,10 +875,10 @@ static int decompress( const int infd, const Cl_options * const cl_opts,
       {
       if( !first_member )
         {
-        if( !cl_opts->loose_trailing && Lh_check_corrupt( header ) )
+        if( !loose_trailing && Lh_check_corrupt( header ) )
           { Pp_show_msg( pp, "Corrupt header in multimember file." );
             retval = 2; }
-        else if( !cl_opts->ignore_trailing )
+        else if( !ignore_trailing )
           { Pp_show_msg( pp, trailing_msg ); retval = 2; }
         break;
         }
@@ -934,23 +929,19 @@ static int decompress( const int infd, const Cl_options * const cl_opts,
 
     if( !LzmaDec_Init( &decoder, raw_props ) )
       { Pp_show_msg( pp, mem_msg ); return 1; }
-    bool data0 = false;
     if( lzip_mode )
       retval = lzip_decode( &decoder, infd, pp, inBuf, &inPos, &inSize,
-                            dictionary_size, &data0 );
+                            dictionary_size );
     else
       retval = lzma_decode( unpackSize, &decoder, infd, inBuf, &inPos,
                             &inSize, dictionary_size, testing );
     LzmaDec_Free(&decoder);
     if( retval != 0 || !lzip_mode ) break;
-    if( !from_stdin ) { multi = !first_member; if( data0 ) empty = true; }
     if( verbosity >= 2 )
       { fputs( testing ? "ok\n" : "done\n", stderr ); Pp_reset( pp ); }
     }
   if( lzip_mode && verbosity == 1 && retval == 0 )
     fputs( testing ? "ok\n" : "done\n", stderr );
-  if( empty && multi && retval == 0 )
-    { show_file_error( pp->name, empty_msg, 0 ); retval = 2; }
   return retval;
   }
 
@@ -1031,7 +1022,7 @@ int main( const int argc, const char * const argv[] )
   {
   /* Mapping from gzip/bzip2 style 0..9 compression levels to the
      corresponding LZMA compression parameters. */
-  const Lzma_options option_mapping[] =
+  const struct Lzma_options option_mapping[] =
     {
     { 1 << 16,   5 },		/* -0 */
     { 1 << 20,   5 },		/* -1 */
@@ -1043,19 +1034,20 @@ int main( const int argc, const char * const argv[] )
     { 1 << 24,  68 },		/* -7 */
     { 3 << 23, 132 },		/* -8 */
     { 1 << 25, 273 } };		/* -9 */
-  Lzma_options encoder_options = option_mapping[6];	/* default = "-6" */
+  struct Lzma_options encoder_options = option_mapping[6];  /* default = "-6" */
   const char * default_output_filename = "";
-  Mode program_mode = m_compress;
-  Cl_options cl_opts;			/* command-line options */
-  Cl_options_init( &cl_opts );
+  enum Mode program_mode = m_compress;
+  int i;
   bool force = false;
+  bool ignore_trailing = true;
   bool keep_input_files = false;
+  bool loose_trailing = false;
   bool recompress = false;
   bool to_stdout = false;
   if( argc > 0 ) invocation_name = argv[0];
 
   enum { opt_lt = 256 };
-  const ap_Option options[] =
+  const struct ap_Option options[] =
     {
     { '0', "fast",              ap_no  },
     { '1', 0,                   ap_no  },
@@ -1085,12 +1077,12 @@ int main( const int argc, const char * const argv[] )
     { 'v', "verbose",           ap_no  },
     { 'V', "version",           ap_no  },
     { opt_lt, "loose-trailing", ap_no  },
-    { 0, 0,                     ap_no  } };
+    {  0, 0,                    ap_no  } };
 
   CRC32_init();
 
   /* static because valgrind complains and memory management in C sucks */
-  static Arg_parser parser;
+  static struct Arg_parser parser;
   if( !ap_init( &parser, argc, argv, options, 0 ) )
     { show_error( mem_msg, 0, false ); return 1; }
   if( ap_error( &parser ) )				/* bad option */
@@ -1105,11 +1097,11 @@ int main( const int argc, const char * const argv[] )
     const char * const arg = ap_argument( &parser, argind );
     switch( code )
       {
-      case '0': case '1': case '2': case '3': case '4': case '5':
-      case '6': case '7': case '8': case '9':
+      case '0': case '1': case '2': case '3': case '4':
+      case '5': case '6': case '7': case '8': case '9':
                 encoder_options = option_mapping[code-'0']; break;
-      case 'a': cl_opts.ignore_trailing = false; break;
-      case 'b': break;					/* ignored */
+      case 'a': ignore_trailing = false; break;
+      case 'b': break;
       case 'c': to_stdout = true; break;
       case 'd': set_mode( &program_mode, m_decompress ); break;
       case 'f': force = true; break;
@@ -1118,17 +1110,17 @@ int main( const int argc, const char * const argv[] )
       case 'k': keep_input_files = true; break;
       case 'm': encoder_options.match_len_limit =
                   getnum( arg, pn, min_match_len_limit, max_match_len ); break;
-      case 'n': break;					/* ignored */
+      case 'n': break;
       case 'o': if( strcmp( arg, "-" ) == 0 ) to_stdout = true;
                 else { default_output_filename = arg; } break;
       case 'q': verbosity = -1; break;
       case 's': encoder_options.dictionary_size = get_dict_size( arg, pn );
                 break;
-      case 'S': break;					/* ignored */
+      case 'S': break;
       case 't': set_mode( &program_mode, m_test ); break;
       case 'v': if( verbosity < 4 ) ++verbosity; break;
       case 'V': show_version(); return 0;
-      case opt_lt: cl_opts.loose_trailing = true; break;
+      case opt_lt: loose_trailing = true; break;
       default: internal_error( "uncaught option." );
       }
     } /* end process options */
@@ -1143,7 +1135,6 @@ int main( const int argc, const char * const argv[] )
   filenames = resize_buffer( filenames, num_filenames * sizeof filenames[0] );
   filenames[0] = "-";
 
-  int i;
   bool filenames_given = false;
   for( i = 0; argind + i < ap_arguments( &parser ); ++i )
     {
@@ -1165,22 +1156,21 @@ int main( const int argc, const char * const argv[] )
   if( !to_stdout && program_mode != m_test && ( filenames_given || to_file ) )
     set_signals( signal_handler );
 
-  static Pretty_print pp;
+  static struct Pretty_print pp;
   Pp_init( &pp, filenames, num_filenames );
 
   int failed_tests = 0;
   int retval = 0;
   const bool one_to_one = !to_stdout && program_mode != m_test && !to_file;
   bool stdin_used = false;
-  struct stat in_stats;
   for( i = 0; i < num_filenames; ++i )
     {
     const char * input_filename = "";
     int infd;
-    const bool from_stdin = strcmp( filenames[i], "-" ) == 0;
+    struct stat in_stats;
 
     Pp_set_name( &pp, filenames[i] );
-    if( from_stdin )
+    if( strcmp( filenames[i], "-" ) == 0 )
       {
       if( stdin_used ) continue; else stdin_used = true;
       infd = STDIN_FILENO;
@@ -1225,7 +1215,7 @@ int main( const int argc, const char * const argv[] )
     if( program_mode == m_compress )
       tmp = compress( infd, &encoder_options, &pp );
     else
-      tmp = decompress( infd, &cl_opts, &pp, from_stdin,
+      tmp = decompress( infd, &pp, ignore_trailing, loose_trailing,
                         program_mode == m_test );
     if( close( infd ) != 0 )
       { show_file_error( pp.name, "Error closing input file", errno );
@@ -1240,9 +1230,7 @@ int main( const int argc, const char * const argv[] )
     if( input_filename[0] && !keep_input_files && one_to_one )
       remove( input_filename );
     }
-  if( delete_output_on_interrupt )					/* -o */
-    close_and_set_permissions( ( retval == 0 && !stdin_used &&
-      filenames_given && num_filenames == 1 ) ? &in_stats : 0 );
+  if( delete_output_on_interrupt ) close_and_set_permissions( 0 );	/* -o */
   else if( outfd >= 0 && close( outfd ) != 0 )				/* -c */
     {
     show_error( "Error closing stdout", errno, false );
@@ -1253,7 +1241,6 @@ int main( const int argc, const char * const argv[] )
              program_name, failed_tests,
              ( failed_tests == 1 ) ? "file" : "files" );
   free( output_filename );
-  Pp_free( &pp );
   free( filenames );
   ap_free( &parser );
   return retval;
diff --git a/testsuite/check.sh b/testsuite/check.sh
index 1760359..8c18a1c 100755
--- a/testsuite/check.sh
+++ b/testsuite/check.sh
@@ -1,6 +1,6 @@
 #! /bin/sh
 # check script for Pdlzip - LZMA lossless data compressor
-# Copyright (C) 2010-2025 Antonio Diaz Diaz.
+# Copyright (C) 2010-2023 Antonio Diaz Diaz.
 #
 # This script is free software: you have unlimited permission
 # to copy, distribute, and modify it.
@@ -28,10 +28,10 @@ if [ -d tmp ] ; then rm -rf tmp ; fi
 mkdir tmp
 cd "${objdir}"/tmp || framework_failure
 
-cp "${testdir}"/test.txt in || framework_failure
+cat "${testdir}"/test.txt > in || framework_failure
 in_lz="${testdir}"/test.txt.lz
+in_em="${testdir}"/test_em.txt.lz
 fox_lz="${testdir}"/fox.lz
-fnz_lz="${testdir}"/fox_nz.lz
 fail=0
 test_failed() { fail=1 ; printf " $1" ; [ -z "$2" ] || printf "($2)" ; }
 
@@ -95,7 +95,7 @@ printf "LZIP\001+.............................." | "${LZIP}" -t 2> /dev/null
 
 printf "\ntesting decompression..."
 
-for i in "${in_lz}" "${testdir}"/test.txt.lzma ; do
+for i in "${in_lz}" "${in_em}" "${testdir}"/test.txt.lzma ; do
 	"${LZIP}" -t "$i" || test_failed $LINENO "$i"
 	"${LZIP}" -d "$i" -o out || test_failed $LINENO "$i"
 	cmp in out || test_failed $LINENO "$i"
@@ -108,13 +108,16 @@ for i in "${in_lz}" "${testdir}"/test.txt.lzma ; do
 	rm -f out || framework_failure
 done
 
-cp "${in_lz}" out.lz || framework_failure
+lines=`"${LZIP}" -tvv "${in_em}" 2>&1 | wc -l` || test_failed $LINENO
+[ "${lines}" -eq 8 ] || test_failed $LINENO "${lines}"
+
+cat "${in_lz}" > out.lz || framework_failure
 "${LZIP}" -dk out.lz || test_failed $LINENO
 cmp in out || test_failed $LINENO
 rm -f out || framework_failure
 "${LZIP}" -cd "${fox_lz}" > fox || test_failed $LINENO
-cp fox copy || framework_failure
-cp "${in_lz}" copy.lz || framework_failure
+cat fox > copy || framework_failure
+cat "${in_lz}" > copy.lz || framework_failure
 "${LZIP}" -d copy.lz out.lz 2> /dev/null	# skip copy, decompress out
 [ $? = 1 ] || test_failed $LINENO
 [ ! -e out.lz ] || test_failed $LINENO
@@ -128,6 +131,7 @@ rm -f copy out || framework_failure
 printf "to be overwritten" > out || framework_failure
 "${LZIP}" -df -o out < "${in_lz}" || test_failed $LINENO
 cmp in out || test_failed $LINENO
+rm -f out || framework_failure
 "${LZIP}" -d -o ./- "${in_lz}" || test_failed $LINENO
 cmp in ./- || test_failed $LINENO
 rm -f ./- || framework_failure
@@ -135,12 +139,12 @@ rm -f ./- || framework_failure
 cmp in ./- || test_failed $LINENO
 rm -f ./- || framework_failure
 
-cp "${in_lz}" anyothername || framework_failure
+cat "${in_lz}" > anyothername || framework_failure
 "${LZIP}" -dv - anyothername - < "${in_lz}" > out 2> /dev/null ||
 	test_failed $LINENO
 cmp in out || test_failed $LINENO
 cmp in anyothername.out || test_failed $LINENO
-rm -f anyothername.out || framework_failure
+rm -f out anyothername.out || framework_failure
 
 "${LZIP}" -tq in "${in_lz}"
 [ $? = 2 ] || test_failed $LINENO
@@ -153,7 +157,7 @@ cat out in | cmp in - || test_failed $LINENO		# out must be empty
 [ $? = 1 ] || test_failed $LINENO
 cmp in out || test_failed $LINENO
 rm -f out || framework_failure
-cp "${in_lz}" out.lz || framework_failure
+cat "${in_lz}" > out.lz || framework_failure
 for i in 1 2 3 4 5 6 7 ; do
 	printf "g" >> out.lz || framework_failure
 	"${LZIP}" -atvvvv out.lz "${in_lz}" 2> /dev/null
@@ -182,9 +186,6 @@ cmp in2 out2 || test_failed $LINENO
 rm -f out2 || framework_failure
 
 cat "${in_lz}" "${in_lz}" > out2.lz || framework_failure
-lines=`"${LZIP}" -tvv out2.lz 2>&1 | wc -l` || test_failed $LINENO
-[ "${lines}" -eq 2 ] || test_failed $LINENO "${lines}"
-
 printf "\ngarbage" >> out2.lz || framework_failure
 "${LZIP}" -tvvvv out2.lz 2> /dev/null || test_failed $LINENO
 "${LZIP}" -atq out2.lz
@@ -202,20 +203,6 @@ printf "to be overwritten" > out2 || framework_failure
 cmp in2 out2 || test_failed $LINENO
 rm -f out2 || framework_failure
 
-touch empty em || framework_failure
-"${LZIP}" -0 em || test_failed $LINENO
-"${LZIP}" -dk em.lz || test_failed $LINENO
-cmp empty em || test_failed $LINENO
-cat em.lz em.lz | "${LZIP}" -t || test_failed $LINENO
-cat em.lz em.lz | "${LZIP}" -d > em || test_failed $LINENO
-cmp empty em || test_failed $LINENO
-cat em.lz "${in_lz}" | "${LZIP}" -t || test_failed $LINENO
-cat em.lz "${in_lz}" | "${LZIP}" -d > out || test_failed $LINENO
-cmp in out || test_failed $LINENO
-cat "${in_lz}" em.lz | "${LZIP}" -t || test_failed $LINENO
-cat "${in_lz}" em.lz | "${LZIP}" -d > out || test_failed $LINENO
-cmp in out || test_failed $LINENO
-
 printf "\ntesting   compression..."
 
 "${LZIP}" -c -0 in in in -o out3.lz > copy2.lz || test_failed $LINENO
@@ -224,7 +211,7 @@ printf "\ntesting   compression..."
 "${LZIP}" -d copy2.lz -o out2 || test_failed $LINENO
 [ -e copy2.lz ] || test_failed $LINENO
 cmp in2 out2 || test_failed $LINENO
-rm -f copy2.lz || framework_failure
+rm -f in2 out2 copy2.lz || framework_failure
 
 "${LZIP}" -cf "${in_lz}" > lzlz 2> /dev/null	# /dev/null is a tty on OS/2
 [ $? = 1 ] || test_failed $LINENO
@@ -272,38 +259,11 @@ rm -f copy out.lz || framework_failure
 
 printf "\ntesting bad input..."
 
-cat em.lz em.lz > ee.lz || framework_failure
-"${LZIP}" -t < ee.lz || test_failed $LINENO
-"${LZIP}" -d < ee.lz > em || test_failed $LINENO
-cmp empty em || test_failed $LINENO
-"${LZIP}" -tq ee.lz
-[ $? = 2 ] || test_failed $LINENO
-"${LZIP}" -dq ee.lz
-[ $? = 2 ] || test_failed $LINENO
-[ ! -e ee ] || test_failed $LINENO
-"${LZIP}" -cdq ee.lz > em
-[ $? = 2 ] || test_failed $LINENO
-cmp empty em || test_failed $LINENO
-rm -f empty em || framework_failure
-cat "${in_lz}" em.lz "${in_lz}" > inein.lz || framework_failure
-"${LZIP}" -t < inein.lz || test_failed $LINENO
-"${LZIP}" -d < inein.lz > out2 || test_failed $LINENO
-cmp in2 out2 || test_failed $LINENO
-"${LZIP}" -tq inein.lz
-[ $? = 2 ] || test_failed $LINENO
-"${LZIP}" -dq inein.lz
-[ $? = 2 ] || test_failed $LINENO
-[ ! -e inein ] || test_failed $LINENO
-"${LZIP}" -cdq inein.lz > out2
-[ $? = 2 ] || test_failed $LINENO
-cmp in2 out2 || test_failed $LINENO
-rm -f in2 out2 inein.lz em.lz || framework_failure
-
 headers='LZIp LZiP LZip LzIP LzIp LziP lZIP lZIp lZiP lzIP'
-body='\001\014\000\000\101\376\367\377\377\340\000\200\000\215\357\002\322\001\000\000\000\000\000\000\000\045\000\000\000\000\000\000\000'
-cp "${in_lz}" int.lz || framework_failure
+body='\001\014\000\203\377\373\377\377\300\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000$\000\000\000\000\000\000\000'
+cat "${in_lz}" > int.lz || framework_failure
 printf "LZIP${body}" >> int.lz || framework_failure
-if "${LZIP}" -t int.lz ; then
+if "${LZIP}" -tq int.lz ; then
 	for header in ${headers} ; do
 		printf "${header}${body}" > int.lz || framework_failure
 		"${LZIP}" -tq int.lz			# first member
@@ -318,7 +278,7 @@ if "${LZIP}" -t int.lz ; then
 		[ $? = 2 ] || test_failed $LINENO ${header}
 		"${LZIP}" -cdq --loose-trailing int.lz > /dev/null
 		[ $? = 2 ] || test_failed $LINENO ${header}
-		cp "${in_lz}" int.lz || framework_failure
+		cat "${in_lz}" > int.lz || framework_failure
 		printf "${header}${body}" >> int.lz || framework_failure
 		"${LZIP}" -tq int.lz			# trailing data
 		[ $? = 2 ] || test_failed $LINENO ${header}
@@ -340,13 +300,10 @@ if "${LZIP}" -t int.lz ; then
 		[ $? = 2 ] || test_failed $LINENO ${header}
 	done
 else
-	printf "warning: skipping header test: 'printf' does not work on your system."
+	printf "\nwarning: skipping header test: 'printf' does not work on your system."
 fi
 rm -f int.lz || framework_failure
 
-"${LZIP}" -tq "${fnz_lz}"
-[ $? = 2 ] || test_failed $LINENO
-
 for i in fox_v2.lz fox_s11.lz fox_de20.lz \
          fox_bcrc.lz fox_crc0.lz fox_das46.lz fox_mes81.lz ; do
 	"${LZIP}" -tq "${testdir}"/$i
@@ -358,13 +315,13 @@ for i in fox_bcrc.lz fox_crc0.lz fox_das46.lz fox_mes81.lz ; do
 	[ $? = 2 ] || test_failed $LINENO $i
 	cmp fox out || test_failed $LINENO $i
 done
-rm -f fox || framework_failure
+rm -f fox out || framework_failure
 
 cat "${in_lz}" "${in_lz}" > in2.lz || framework_failure
 cat "${in_lz}" "${in_lz}" "${in_lz}" > in3.lz || framework_failure
-if dd if=in3.lz of=trunc.lz bs=14682 count=1 2> /dev/null &&
-   [ -e trunc.lz ] && cmp in2.lz trunc.lz ; then
-	for i in 6 20 14664 14683 14684 14685 14686 14687 14688 ; do
+if dd if=in3.lz of=trunc.lz bs=14752 count=1 2> /dev/null &&
+   [ -e trunc.lz ] && cmp in2.lz trunc.lz > /dev/null 2>&1 ; then
+	for i in 6 20 14734 14753 14754 14755 14756 14757 14758 ; do
 		dd if=in3.lz of=trunc.lz bs=$i count=1 2> /dev/null
 		"${LZIP}" -tq trunc.lz
 		[ $? = 2 ] || test_failed $LINENO $i
@@ -376,32 +333,28 @@ if dd if=in3.lz of=trunc.lz bs=14682 count=1 2> /dev/null &&
 		[ $? = 2 ] || test_failed $LINENO $i
 	done
 else
-	printf "warning: skipping truncation test: 'dd' does not work on your system."
+	printf "\nwarning: skipping truncation test: 'dd' does not work on your system."
 fi
 rm -f in2.lz in3.lz trunc.lz || framework_failure
 
-cp "${in_lz}" ingin.lz || framework_failure
+cat "${in_lz}" > ingin.lz || framework_failure
 printf "g" >> ingin.lz || framework_failure
 cat "${in_lz}" >> ingin.lz || framework_failure
 "${LZIP}" -atq ingin.lz
 [ $? = 2 ] || test_failed $LINENO
 "${LZIP}" -atq < ingin.lz
 [ $? = 2 ] || test_failed $LINENO
-"${LZIP}" -acdq ingin.lz > out
+"${LZIP}" -acdq ingin.lz > /dev/null
 [ $? = 2 ] || test_failed $LINENO
-cmp in out || test_failed $LINENO
-"${LZIP}" -adq < ingin.lz > out
+"${LZIP}" -adq < ingin.lz > /dev/null
 [ $? = 2 ] || test_failed $LINENO
-cmp in out || test_failed $LINENO
 "${LZIP}" -t ingin.lz || test_failed $LINENO
 "${LZIP}" -t < ingin.lz || test_failed $LINENO
-"${LZIP}" -dk ingin.lz || test_failed $LINENO
-cmp in ingin || test_failed $LINENO
 "${LZIP}" -cd ingin.lz > out || test_failed $LINENO
 cmp in out || test_failed $LINENO
 "${LZIP}" -d < ingin.lz > out || test_failed $LINENO
 cmp in out || test_failed $LINENO
-rm -f out ingin ingin.lz || framework_failure
+rm -f out ingin.lz || framework_failure
 
 echo
 if [ ${fail} = 0 ] ; then
diff --git a/testsuite/fox_nz.lz b/testsuite/fox_nz.lz
deleted file mode 100644
index 44a4b58..0000000
Binary files a/testsuite/fox_nz.lz and /dev/null differ
diff --git a/testsuite/test.txt b/testsuite/test.txt
index 423f0c0..9196a3a 100644
--- a/testsuite/test.txt
+++ b/testsuite/test.txt
@@ -1,7 +1,8 @@
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -338,7 +339,8 @@ Public License instead of this License.
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
diff --git a/testsuite/test.txt.lz b/testsuite/test.txt.lz
index 5dc169f..22cea6e 100644
Binary files a/testsuite/test.txt.lz and b/testsuite/test.txt.lz differ
diff --git a/testsuite/test.txt.lzma b/testsuite/test.txt.lzma
index 091c023..53e54ea 100644
Binary files a/testsuite/test.txt.lzma and b/testsuite/test.txt.lzma differ
diff --git a/testsuite/test_em.txt.lz b/testsuite/test_em.txt.lz
new file mode 100644
index 0000000..7e96250
Binary files /dev/null and b/testsuite/test_em.txt.lz differ