Merging upstream version 0.8.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>

1 files changed, 306 insertions, 690 deletions

diff --git a/main.cc b/main.cc
index eba364b..bc7c5fb 100644
--- a/main.cc
+++ b/main.cc
@@ -1,5 +1,5 @@
-/*  Zutils - A file format detector for compressed files
-    Copyright (C) 2009 Antonio Diaz Diaz.
+/*  Zutils - Utilities dealing with compressed files
+    Copyright (C) 2009, 2010 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -14,257 +14,69 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
-/*
-    Return values: 0 for a normal exit, 1 for environmental problems
-    (file not found, invalid flags, I/O errors, etc), 2 to indicate a
-    corrupt or invalid input file, 3 for an internal consistency error
-    (eg, bug) which caused zutils to panic.
-*/
 
 #define _FILE_OFFSET_BITS 64
 
-#include <algorithm>
 #include <cerrno>
 #include <climits>
 #include <csignal>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <list>
 #include <string>
 #include <vector>
+#include <dirent.h>
 #include <fcntl.h>
 #include <stdint.h>
 #include <unistd.h>
-#include <utime.h>
 #include <sys/stat.h>
-#include <sys/time.h>
+#if defined(__MSVCRT__) || defined(__OS2__)
+#include <io.h>
+#endif
 
 #include "arg_parser.h"
+#include "zutils.h"
 
-#ifndef LLONG_MAX
-#define LLONG_MAX  0x7FFFFFFFFFFFFFFFLL
-#endif
-#ifndef LLONG_MIN
-#define LLONG_MIN  (-LLONG_MAX - 1LL)
-#endif
-#ifndef ULLONG_MAX
-#define ULLONG_MAX 0xFFFFFFFFFFFFFFFFULL
+#if CHAR_BIT != 8
+#error "Environments where CHAR_BIT != 8 are not supported."
 #endif
 
 
 namespace {
 
-const char * invocation_name = 0;
-const char * const Program_name    = "Zutils";
-const char * const program_name    = "zutils";
-const char * const program_year    = "2009";
-
-struct { const char * from; const char * to; } const known_extensions[] = {
-  { ".zf",  ""     },
-  { 0,      0      } };
-
-enum Mode { m_compress = 0, m_decompress, m_test };
-
-std::string output_filename;
-int outhandle = -1;
-int verbosity = 0;
-bool delete_output_on_interrupt = false;
-
-
-class Pretty_print
-  {
-  const char * const stdin_name;
-  const unsigned int stdin_name_len;
-  unsigned int longest_name;
-  std::string name_;
-  mutable bool first_post;
-
-public:
-  Pretty_print( const std::vector< std::string > & filenames )
-    : stdin_name( "(stdin)" ), stdin_name_len( std::strlen( stdin_name ) ),
-      longest_name( 0 ), first_post( false )
-    {
-    for( unsigned int i = 0; i < filenames.size(); ++i )
-      {
-      const std::string & s = filenames[i];
-      const unsigned int len = ( ( s == "-" ) ? stdin_name_len : s.size() );
-      if( len > longest_name ) longest_name = len;
-      }
-    if( longest_name == 0 ) longest_name = stdin_name_len;
-    }
-
-  void set_name( const std::string & filename )
-    {
-    if( filename.size() && filename != "-" ) name_ = filename;
-    else name_ = stdin_name;
-    first_post = true;
-    }
-
-  void reset() const throw() { if( name_.size() ) first_post = true; }
-  const char * name() const throw() { return name_.c_str(); }
-  void operator()( const char * const msg = 0 ) const throw();
-  };
-
+#ifdef O_BINARY
+const int o_binary = O_BINARY;
+#else
+const int o_binary = 0;
+#endif
 
-void Pretty_print::operator()( const char * const msg ) const throw()
-  {
-  if( verbosity >= 0 )
-    {
-    if( first_post )
-      {
-      first_post = false;
-      std::fprintf( stderr, "  %s: ", name_.c_str() );
-      for( unsigned int i = 0; i < longest_name - name_.size(); ++i )
-        std::fprintf( stderr, " " );
-      if( !msg ) std::fflush( stderr );
-      }
-    if( msg ) std::fprintf( stderr, "%s.\n", msg );
-    }
-  }
+enum Mode { m_none, m_zcat, m_zgrep, m_ztest };
 
 
 void show_help() throw()
   {
-  std::printf( "%s - A file format detector for compressed files.\n", Program_name );
-  std::printf( "\nUsage: %s [options] [files]\n", invocation_name );
-  std::printf( "\nOptions:\n" );
+  std::printf( "Zutils is a collection of utilities able to deal with any combination of\n" );
+  std::printf( "compressed and non-compressed files transparently. If any given file,\n" );
+  std::printf( "including standard input, is compressed, its uncompressed content is used.\n" );
+  std::printf( "The supported compressors are bzip2, gzip, lzip and xz.\n" );
+  std::printf( "\nUsage: %s <operation> [options] [files]\n", invocation_name );
+  std::printf( "\nTry `%s <operation> --help' for more specific help.\n", invocation_name );
+  std::printf( "\nOperations:\n" );
   std::printf( "  -h, --help                 display this help and exit\n" );
   std::printf( "  -V, --version              output version information and exit\n" );
-//  std::printf( "  -c, --stdout               send output to standard output\n" );
-//  std::printf( "  -d, --decompress           decompress\n" );
-//  std::printf( "  -f, --force                overwrite existing output files\n" );
-//  std::printf( "  -k, --keep                 keep (don't delete) input files\n" );
-  std::printf( "  -m, --magic=<type>         output magic bytes for given file type\n" );
-//  std::printf( "  -o, --output=<file>        if reading stdin, place the output into <file>\n" );
-  std::printf( "  -q, --quiet                suppress all messages\n" );
-  std::printf( "  -t, --test                 test compressed file type\n" );
-  std::printf( "  -v, --verbose              be verbose (a 2nd -v gives more)\n" );
-  std::printf( "\nReport bugs to zutils-bug@nongnu.org\n" );
-  std::printf( "Zutils home page: http://www.nongnu.org/zutils/zutils.html\n" );
+  std::printf( "      --zcat                 zcat operation\n" );
+  std::printf( "      --zgrep                zgrep operation\n" );
+  std::printf( "      --ztest                ztest operation\n" );
+  show_help_addr();
   }
 
 
-void show_version() throw()
+int simple_extension_index( const std::string & name ) throw()
   {
-  std::printf( "%s %s\n", Program_name, PROGVERSION );
-  std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
-  std::printf( "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n" );
-  std::printf( "This is free software: you are free to change and redistribute it.\n" );
-  std::printf( "There is NO WARRANTY, to the extent permitted by law.\n" );
-  }
-
-
-void show_error( const char * msg, const int errcode = 0, const bool help = false ) throw()
-  {
-  if( verbosity >= 0 )
+  for( int i = 0; simple_extensions[i]; ++i )
     {
-    if( msg && msg[0] != 0 )
-      {
-      std::fprintf( stderr, "%s: %s", program_name, msg );
-      if( errcode > 0 ) std::fprintf( stderr, ": %s", std::strerror( errcode ) );
-      std::fprintf( stderr, "\n" );
-      }
-    if( help && invocation_name && invocation_name[0] != 0 )
-      std::fprintf( stderr, "Try `%s --help' for more information.\n", invocation_name );
-    }
-  }
-
-
-void internal_error( const char * msg )
-  {
-  std::string s( "internal error: " ); s += msg;
-  show_error( s.c_str() );
-  std::exit( 3 );
-  }
-
-
-const char * format_num( long long num, long long limit = 9999,
-                         const int set_prefix = 0 ) throw()
-  {
-  const char * const si_prefix[8] =
-    { "k", "M", "G", "T", "P", "E", "Z", "Y" };
-  const char * const binary_prefix[8] =
-    { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
-  static bool si = false;
-  static char buf[16];
-
-  if( set_prefix ) si = ( set_prefix > 0 );
-  const int factor = ( si ) ? 1000 : 1024;
-  const char * const *prefix = ( si ) ? si_prefix : binary_prefix;
-  const char *p = "";
-  limit = std::max( 999LL, std::min( 999999LL, limit ) );
-
-  for( int i = 0; i < 8 && ( llabs( num ) > limit ||
-       ( llabs( num ) >= factor && num % factor == 0 ) ); ++i )
-    { num /= factor; p = prefix[i]; }
-  snprintf( buf, sizeof buf, "%lld %s", num, p );
-  return buf;
-  }
-
-
-long long getnum( const char * ptr, const int bs,
-                  const long long llimit = LLONG_MIN + 1,
-                  const long long ulimit = LLONG_MAX ) throw()
-  {
-  errno = 0;
-  char *tail;
-  long long result = strtoll( ptr, &tail, 0 );
-  if( tail == ptr )
-    {
-    show_error( "bad or missing numerical argument", 0, true );
-    std::exit( 1 );
-    }
-
-  if( !errno && tail[0] )
-    {
-    int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
-    int exponent = 0;
-    bool bad_multiplier = false;
-    switch( tail[0] )
-      {
-      case ' ': break;
-      case 'b': if( bs > 0 ) { factor = bs; exponent = 1; }
-                else bad_multiplier = true;
-                break;
-      case 'Y': exponent = 8; break;
-      case 'Z': exponent = 7; break;
-      case 'E': exponent = 6; break;
-      case 'P': exponent = 5; break;
-      case 'T': exponent = 4; break;
-      case 'G': exponent = 3; break;
-      case 'M': exponent = 2; break;
-      case 'K': if( factor == 1024 ) exponent = 1; else bad_multiplier = true;
-                break;
-      case 'k': if( factor == 1000 ) exponent = 1; else bad_multiplier = true;
-                break;
-      default: bad_multiplier = true;
-      }
-    if( bad_multiplier )
-      {
-      show_error( "bad multiplier in numerical argument", 0, true );
-      std::exit( 1 );
-      }
-    for( int i = 0; i < exponent; ++i )
-      {
-      if( LLONG_MAX / factor >= llabs( result ) ) result *= factor;
-      else { errno = ERANGE; break; }
-      }
-    }
-  if( !errno && ( result < llimit || result > ulimit ) ) errno = ERANGE;
-  if( errno )
-    {
-    show_error( "numerical argument out of limits" );
-    std::exit( 1 );
-    }
-  return result;
-  }
-
-
-int extension_index( const std::string & name ) throw()
-  {
-  for( int i = 0; known_extensions[i].from; ++i )
-    {
-    const std::string ext( known_extensions[i].from );
+    const std::string ext( simple_extensions[i] );
     if( name.size() > ext.size() &&
         name.compare( name.size() - ext.size(), ext.size(), ext ) == 0 )
       return i;
@@ -273,449 +85,262 @@ int extension_index( const std::string & name ) throw()
   }
 
 
-int open_instream( const std::string & name, struct stat * in_statsp,
-                   const Mode program_mode, const int eindex,
-                   const bool force, const bool to_stdout ) throw()
+int open_instream( std::string & input_filename, const Mode program_mode ) throw()
   {
-  int inhandle = -1;
-  if( program_mode == m_compress && !force && eindex >= 0 )
-    {
-    if( verbosity >= 0 )
-      std::fprintf( stderr, "%s: input file `%s' already has `%s' suffix.\n",
-                    program_name, name.c_str(),
-                    known_extensions[eindex].from );
-    }
-  else
+  int infd = open( input_filename.c_str(), O_RDONLY | o_binary );
+  if( infd < 0 )
     {
-    inhandle = open( name.c_str(), O_RDONLY );
-    if( inhandle < 0 )
+    if( ( program_mode == m_zcat || program_mode == m_zgrep )
+        && simple_extension_index( input_filename ) < 0 )
       {
-      if( verbosity >= 0 )
-        std::fprintf( stderr, "%s: Can't open input file `%s': %s.\n",
-                      program_name, name.c_str(), std::strerror( errno ) );
-      }
-    else
-      {
-      const int i = fstat( inhandle, in_statsp );
-      const mode_t & mode = in_statsp->st_mode;
-      if( i < 0 || !( S_ISREG( mode ) || ( to_stdout &&
-                      ( S_ISFIFO( mode ) || S_ISSOCK( mode ) ||
-                        S_ISBLK( mode ) || S_ISCHR( mode ) ) ) ) )
+      for( int i = 0; simple_extensions[i]; ++i )
         {
-        if( verbosity >= 0 )
-          std::fprintf( stderr, "%s: input file `%s' is not a regular file%s.\n",
-                        program_name, name.c_str(),
-                        to_stdout ? "" : " and `--stdout' was not specified" );
-        close( inhandle );
-        inhandle = -1;
+        const std::string name( input_filename + simple_extensions[i] );
+        infd = open( name.c_str(), O_RDONLY | o_binary );
+        if( infd >= 0 ) { input_filename = name; break; }
         }
       }
+    if( infd < 0 && verbosity >= 0 )
+      std::fprintf( stderr, "%s: Can't open input file `%s': %s.\n",
+                    util_name, input_filename.c_str(), std::strerror( errno ) );
     }
-  return inhandle;
-  }
-
-
-void set_c_outname( const std::string & name ) throw()
-  {
-  output_filename = name;
-  output_filename += known_extensions[0].from;
-  }
-
-
-void set_d_outname( const std::string & name, const int i ) throw()
-  {
-  if( i >= 0 )
-    {
-    const std::string from( known_extensions[i].from );
-    if( name.size() > from.size() )
-      {
-      output_filename.assign( name, 0, name.size() - from.size() );
-      output_filename += known_extensions[i].to;
-      return;
-      }
-    }
-  output_filename = name; output_filename += ".out";
-  if( verbosity >= 0 )
-    std::fprintf( stderr, "%s: can't guess original name for `%s' -- using `%s'.\n",
-                  program_name, name.c_str(), output_filename.c_str() );
-  }
-
-
-bool open_outstream( const bool /*force*/ ) throw()
-  {
-/*  if( force )
-    outhandle = open( output_filename.c_str(), O_CREAT | O_TRUNC | O_WRONLY,
-                      S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH );
-  else outhandle = open( output_filename.c_str(), O_CREAT | O_EXCL | O_WRONLY,
-                         S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH );
-  if( outhandle < 0 )
-    {
-    if( errno == EEXIST ) outhandle = -2; else outhandle = -1;
-    if( verbosity >= 0 )
-      {
-      if( outhandle == -2 )
-        std::fprintf( stderr, "%s: Output file %s already exists, skipping.\n",
-                      program_name, output_filename.c_str() );
-      else
-        std::fprintf( stderr, "%s: Can't create output file `%s': %s.\n",
-                      program_name, output_filename.c_str(), std::strerror( errno ) );
-      }
-    }*/
-  return ( outhandle >= 0 );
-  }
-
-
-bool check_tty( const int inhandle, const Mode program_mode ) throw()
-  {
-  if( program_mode == m_compress && isatty( outhandle ) )
-    {
-    show_error( "I won't write compressed data to a terminal.", 0, true );
-    return false;
-    }
-  if( ( program_mode == m_decompress || program_mode == m_test ) &&
-      isatty( inhandle ) )
-    {
-    show_error( "I won't read compressed data from a terminal.", 0, true );
-    return false;
-    }
-  return true;
+  return infd;
   }
 
+#include "zcat.cc"
+#include "zgrep.cc"
+#include "ztest.cc"
 
-void cleanup_and_fail( const int retval ) throw()
-  {
-  if( delete_output_on_interrupt )
-    {
-    if( verbosity >= 0 )
-      std::fprintf( stderr, "%s: Deleting output file `%s', if it exists.\n",
-               program_name, output_filename.c_str() );
-    if( outhandle >= 0 ) { close( outhandle ); outhandle = -1; }
-    if( std::remove( output_filename.c_str() ) != 0 )
-      show_error( "WARNING: deletion of output file (apparently) failed." );
-    }
-  std::exit( retval );
-  }
-
-
-     // Set permissions, owner and times.
-void close_and_set_permissions( const struct stat * in_statsp, int * retvalp )
-  {
-  int tmp = 0;
-  if( in_statsp )
-    {
-    if( fchmod( outhandle, in_statsp->st_mode ) != 0 ) tmp = 1;
-    if( !tmp ) (void)fchown( outhandle, in_statsp->st_uid, in_statsp->st_gid );
-    // fchown will in many cases return with EPERM, which can be safely ignored.
-    }
-  if( close( outhandle ) == 0 ) outhandle = -1;
-  else cleanup_and_fail( 1 );
-  delete_output_on_interrupt = false;
-  if( !in_statsp ) return;
-  if( !tmp )
-    {
-    struct utimbuf t;
-    t.actime = in_statsp->st_atime;
-    t.modtime = in_statsp->st_mtime;
-    tmp = utime( output_filename.c_str(), &t );
-    }
-  if( tmp )
-    {
-    if( tmp > *retvalp ) *retvalp = tmp;
-    show_error( "I can't change output file attributes." );
-    cleanup_and_fail( *retvalp );
-    }
-  }
+} // end namespace
 
 
-// Returns the number of bytes really read.
-// If (returned value < size) and (errno == 0), means EOF was reached.
-//
-int readblock( const int fd, char * buf, const int size ) throw()
+int main( const int argc, const char * const argv[] )
   {
-  int rest = size;
-  errno = 0;
-  while( rest > 0 )
-    {
-    errno = 0;
-    const int n = read( fd, buf + size - rest, rest );
-    if( n > 0 ) rest -= n;
-    else if( n == 0 ) break;
-    else if( errno != EINTR && errno != EAGAIN ) break;
-    }
-  return ( rest > 0 ) ? size - rest : size;
-  }
-
+  enum { help_opt = 256, verbose_opt, zcat_opt, zgrep_opt, ztest_opt };
+  const Arg_parser::Option * options = 0;
+  int infd = -1;
+  Mode program_mode = m_none;
+  bool recursive = false;
+  std::string input_filename;
+  std::list< std::string > filenames;
+  Cat_options cat_options;
+  std::vector< const char * > grep_args;	// args to grep, maybe empty
+  std::vector< const char * > ztest_args;	// args to ztest, maybe empty
+  invocation_name = argv[0];
 
-// Returns the number of bytes really written.
-// If (returned value < size), it is always an error.
-//
-int writeblock( const int fd, const char * buf, const int size ) throw()
-  {
-  int rest = size;
-  errno = 0;
-  while( rest > 0 )
+  const Arg_parser::Option m_zcat_options[] =
     {
-    errno = 0;
-    const int n = write( fd, buf + size - rest, rest );
-    if( n > 0 ) rest -= n;
-    else if( errno && errno != EINTR && errno != EAGAIN ) break;
-    }
-  return ( rest > 0 ) ? size - rest : size;
-  }
-
-/*
-int compress( const int inhandle, const Pretty_print & pp,
-              const struct stat * in_statsp, int * retvalp )
-  {
-  long long in_size = 0, out_size = 0;
-  if( verbosity >= 1 )
+    { 'A', "show-all",         Arg_parser::no  },	// cat
+    { 'b', "number-nonblank",  Arg_parser::no  },	// cat
+    { 'c', "stdout",           Arg_parser::no  },	// gzip
+    { 'd', "decompress",       Arg_parser::no  },	// gzip
+    { 'e',  0,                 Arg_parser::no  },	// cat
+    { 'E', "show-ends",        Arg_parser::no  },	// cat
+    { 'f', "force",            Arg_parser::no  },	// gzip
+    { 'h', "help",             Arg_parser::no  },
+    { 'l', "list",             Arg_parser::no  },	// gzip
+    { 'L', "license",          Arg_parser::no  },	// gzip
+    { 'n', "number",           Arg_parser::no  },	// cat
+    { 'q', "quiet",            Arg_parser::no  },
+    { 'r', "recursive",        Arg_parser::no  },
+    { 's', "squeeze-blank",    Arg_parser::no  },	// cat
+    { 't',  0,                 Arg_parser::no  },	// cat
+    { 'T', "show-tabs",        Arg_parser::no  },	// cat
+    { 'v', "show-nonprinting", Arg_parser::no  },	// cat
+    { 'V', "version",          Arg_parser::no  },
+    { verbose_opt, "verbose",  Arg_parser::no  },
+    { zcat_opt,    "zcat",     Arg_parser::no  },
+    {  0 ,  0,                 Arg_parser::no  } };
+
+  const Arg_parser::Option m_zgrep_options[] =
     {
-    pp();
-    if( in_size <= 0 || out_size <= 0 )
-      std::fprintf( stderr, "no data compressed.\n" );
-    else
-      std::fprintf( stderr, "%6.3f:1, %6.3f bits/byte, "
-                            "%5.2f%% saved, %lld in, %lld out.\n",
-                    (double)in_size / out_size,
-                    ( 8.0 * out_size ) / in_size,
-                    100.0 * ( 1.0 - ( (double)out_size / in_size ) ),
-                    in_size, out_size );
-    }
-  return 0;
-  }
-
-
-int decompress( const int inhandle, const Pretty_print & pp )
-  {
-  if( verbosity >= 1 )
-    std::fprintf( stderr, "done\n" );
-  return 0;
-  }
-*/
-
-unsigned char xdigit( const int value ) throw()
-  {
-  if( value >= 0 && value <= 9 ) return '0' + value;
-  if( value >= 10 && value <= 15 ) return 'A' + value - 10;
-  return 0;
-  }
-
-
-int xtoi( const unsigned char ch ) throw()
-  {
-  switch( ch )
+    { 'a', "text",                  Arg_parser::no  },	// grep GNU
+    { 'A', "after-context",         Arg_parser::yes },	// grep GNU
+    { 'b', "byte-offset",           Arg_parser::no  },	// grep GNU
+    { 'B', "before-context",        Arg_parser::yes },	// grep GNU
+    { 'c', "count",                 Arg_parser::no  },	// grep
+    { 'C', "context",               Arg_parser::yes },	// grep GNU
+    { 'e', "regexp",                Arg_parser::yes },	// grep
+    { 'E', "extended-regexp",       Arg_parser::no  },	// grep
+    { 'f', "file ",                 Arg_parser::yes },	// grep
+    { 'F', "fixed-strings",         Arg_parser::no  },	// grep
+    { 'h', "no-filename",           Arg_parser::no  },	// grep GNU
+    { 'H', "with-filename",         Arg_parser::no  },	// grep GNU
+    { 'i', "ignore-case",           Arg_parser::no  },	// grep
+    { 'I',  0,                      Arg_parser::no  },	// grep GNU
+    { 'l', "files-with-matches",    Arg_parser::no  },	// grep
+    { 'L', "files-without-match",   Arg_parser::no  },	// grep GNU
+    { 'm', "max-count",             Arg_parser::yes },	// grep GNU
+    { 'n', "line-number",           Arg_parser::no  },	// grep
+    { 'o', "only-matching",         Arg_parser::no  },	// grep
+    { 'q', "quiet",                 Arg_parser::no  },
+    { 'r', "recursive",             Arg_parser::no  },
+    { 's', "no-messages",           Arg_parser::no  },	// grep
+    { 'v', "invert-match",          Arg_parser::no  },	// grep
+    { 'V', "version",               Arg_parser::no  },
+    { 'w', "word-regexp",           Arg_parser::no  },	// grep GNU
+    { 'x', "line-regexp",           Arg_parser::no  },	// grep
+    { help_opt,    "help",          Arg_parser::no  },
+    { verbose_opt, "verbose",       Arg_parser::no  },
+    { zgrep_opt,   "zgrep",         Arg_parser::no  },
+    {  0 ,  0,                      Arg_parser::no  } };
+
+  const Arg_parser::Option m_ztest_options[] =
     {
-    case '0': return 0;
-    case '1': return 1;
-    case '2': return 2;
-    case '3': return 3;
-    case '4': return 4;
-    case '5': return 5;
-    case '6': return 6;
-    case '7': return 7;
-    case '8': return 8;
-    case '9': return 9;
-    case 'a':
-    case 'A': return 0x0A;
-    case 'b':
-    case 'B': return 0x0B;
-    case 'c':
-    case 'C': return 0x0C;
-    case 'd':
-    case 'D': return 0x0D;
-    case 'e':
-    case 'E': return 0x0E;
-    case 'f':
-    case 'F': return 0x0F;
-    default: return -1;
-    }
-  }
-
-
-bool hex_to_data( const std::string & hex, std::string & data )
-  {
-  data.clear();
-  if( hex.size() == 0 || hex.size() % 2 != 0 ) return false;
-  for( unsigned int i = 0; 2 * i + 1 < hex.size(); ++i )
+    { 'h', "help",        Arg_parser::no  },
+    { 'q', "quiet",       Arg_parser::no  },
+    { 'r', "recursive",   Arg_parser::no  },
+    { 'v', "verbose",     Arg_parser::no  },
+    { 'V', "version",     Arg_parser::no  },
+    { ztest_opt, "ztest", Arg_parser::no  },
+    {  0 ,  0,            Arg_parser::no  } };
+
+  { // parse operation
+  const Arg_parser::Option operations[] =
     {
-    int uch = xtoi( hex[2*i] );
-    int lch = xtoi( hex[2*i+1] );
-    if( uch < 0 || lch < 0 ) return false;
-    data.push_back( ( uch << 4 ) | lch );
-    }
-  return true;
-  }
-
-
-int print_magic_type( const std::string & magic_type )
-  {
-  std::string data;
-
-  if( magic_type == "bzip2" ) std::printf( "BZh" );
-  else if( magic_type == "gzip" ) std::printf( "\x1F\x8B" );
-  else if( magic_type == "lzip" ) std::printf( "LZIP" );
-  else if( magic_type == "xz" ) std::printf( "%c7zXZ", '\xFD' );
-  else if( hex_to_data( magic_type, data ) ) std::printf( data.c_str() );
-  else return 1;
-  return 0;
-  }
-
+    { 'h', "help",              Arg_parser::no  },
+    { 'V', "version",           Arg_parser::no  },
+    { zcat_opt,  "zcat",        Arg_parser::no  },
+    { zgrep_opt, "zgrep",       Arg_parser::no  },
+    { ztest_opt, "ztest",       Arg_parser::no  },
+    {  0 ,  0,                  Arg_parser::no  } };
+
+  const Arg_parser parser( argv[1], ( argc > 2 ) ? argv[2] : 0, operations );
+  if( parser.error().size() )				// bad operation
+    { show_error( parser.error().c_str(), 0, true ); return 1; }
 
-int test_stdin_type( const int inhandle, const Pretty_print & pp )
-  {
-  unsigned char buf[5];
-  const char * msg = 0;
-  int i = 0;
-  if( readblock( inhandle, (char *)buf, 1 ) == 1 )
+  if( parser.arguments() > 0 )
     {
-    if( buf[0] == 0x1F )
+    switch( parser.code( 0 ) )
       {
-      if( readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 0x8B )
-        msg = "gzip";
-      }
-    else if( buf[0] == 'B' )
-      {
-      if( readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 'Z' &&
-          readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 'h' )
-        msg = "bzip2";
-      }
-    else if( buf[0] == 'L' )
-      {
-      if( readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 'Z' &&
-          readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 'I' &&
-          readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 'P' )
-        msg = "lzip";
-      }
-    else if( buf[0] == 0xFD )
-      {
-      if( readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == '7' &&
-          readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 'z' &&
-          readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 'X' &&
-          readblock( inhandle, (char *)&buf[++i], 1 ) == 1 && buf[i] == 'Z' )
-        msg = "xz";
-      }
-    }
-  const int retval = ( msg ? 0 : 1 );
-  if( verbosity >= 0 )
-    {
-    if( verbosity >= 1 ) pp();
-    if( !msg )
-      {
-      char hexmsg[(2*sizeof buf)+1];
-      for( int j = 0; j <= i; ++j )
-        {
-        hexmsg[2*j] = xdigit( buf[j] >> 4 );
-        hexmsg[2*j+1] = xdigit( buf[j] & 0x0F );
-        }
-      hexmsg[2*i+2] = 0;
-      msg = hexmsg;
+      case  0 : break;
+      case 'h': show_help(); return 0;
+      case 'V': show_version(); return 0;
+      case zcat_opt  : program_mode = m_zcat; options = m_zcat_options;
+                       util_name = "zcat"; break;
+      case zgrep_opt : program_mode = m_zgrep; options = m_zgrep_options;
+                       util_name = "zgrep"; break;
+      case ztest_opt : program_mode = m_ztest; options = m_ztest_options;
+                       util_name = "ztest"; break;
+      default : internal_error( "uncaught option" );
       }
-    std::printf( "%s\n", msg );
     }
-  return retval;
-  }
 
+#if defined(__MSVCRT__) || defined(__OS2__)
+  _setmode( STDIN_FILENO, O_BINARY );
+  _setmode( STDOUT_FILENO, O_BINARY );
+#endif
 
-int test_type( const int inhandle, const Pretty_print & pp )
-  {
-  unsigned char buf[5];
-  const char * msg = 0;
-  const int size = readblock( inhandle, (char *)buf, sizeof buf );
-  if( size == (int)sizeof buf )
-    {
-    if( buf[0] == 0x1F && buf[1] == 0x8B )
-      msg = "gzip";
-    else if( buf[0] == 'B' && buf[1] == 'Z' && buf[2] == 'h' )
-      msg = "bzip2";
-    else if( buf[0] == 'L' && buf[1] == 'Z' && buf[2] == 'I' && buf[3] == 'P' )
-      msg = "lzip";
-    else if( buf[0] == 0xFD && buf[1] == '7' && buf[2] == 'z' && buf[3] == 'X' && buf[4] == 'Z' )
-      msg = "xz";
-    }
-  const int retval = ( msg ? 0 : 1 );
-  if( verbosity >= 0 )
+  if( program_mode == m_none )
     {
-    if( verbosity >= 1 ) pp();
-    if( !msg ) msg = "unknown";
-    std::printf( "%s\n", msg );
+    show_error( "You must specify the operation to be performed.", 0, true );
+    return 1;
     }
-  return retval;
-  }
-
-
-extern "C" void signal_handler( int ) throw()
-  {
-  show_error( "Control-C or similar caught, quitting." );
-  cleanup_and_fail( 0 );
-  }
-
+  } // end parse operation
 
-void set_signals() throw()
-  {
-  signal( SIGHUP, signal_handler );
-  signal( SIGINT, signal_handler );
-  signal( SIGTERM, signal_handler );
-  }
-
-} // end namespace
-
-
-int main( const int argc, const char * argv[] )
-  {
-  int inhandle = -1;
-  Mode program_mode = m_compress;
-  bool force = false;
-  bool keep_input_files = false;
-  bool to_stdout = false;
-  std::string input_filename;
-  std::string default_output_filename;
-  std::vector< std::string > filenames;
-  std::string magic_type;
-  invocation_name = argv[0];
-
-  const Arg_parser::Option options[] =
-    {
-    { 'c', "stdout",          Arg_parser::no  },
-    { 'd', "decompress",      Arg_parser::no  },
-    { 'f', "force",           Arg_parser::no  },
-    { 'h', "help",            Arg_parser::no  },
-    { 'k', "keep",            Arg_parser::no  },
-    { 'm', "magic",           Arg_parser::yes },
-    { 'o', "output",          Arg_parser::yes },
-    { 'q', "quiet",           Arg_parser::no  },
-    { 't', "test",            Arg_parser::no  },
-    { 'v', "verbose",         Arg_parser::no  },
-    { 'V', "version",         Arg_parser::no  },
-    {  0 ,  0,                Arg_parser::no  } };
-
-  Arg_parser parser( argc, argv, options );
+  const Arg_parser parser( argc, argv, options );
   if( parser.error().size() )				// bad option
-    { show_error( parser.error().c_str(), 0, true ); return 1; }
+    { show_error( parser.error().c_str(), 0, true );
+      return ( program_mode == m_zcat ) ? 1 : 2; }
 
   int argind = 0;
+  bool grep_list = false;
+  bool grep_show_name = true;
+  bool grep_pattern_found = false;
   for( ; argind < parser.arguments(); ++argind )
     {
     const int code = parser.code( argind );
-    if( !code ) break;					// no more options
-    const std::string & arg = parser.argument( argind );
-    switch( code )
+    const char * arg = parser.argument( argind ).c_str();
+    if( !code )
       {
-      case 'c': to_stdout = true; break;
-      case 'd': program_mode = m_decompress; break;
-      case 'f': force = true; break;
-      case 'h': show_help(); return 0;
-      case 'k': keep_input_files = true; break;
-      case 'm': magic_type = arg; break;
-      case 'o': default_output_filename = arg; break;
-      case 'q': verbosity = -1; break;
-      case 't': program_mode = m_test; break;
-      case 'v': if( verbosity < 4 ) ++verbosity; break;
-      case 'V': show_version(); return 0;
-      default : internal_error( "uncaught option" );
+      if( program_mode == m_zgrep && !grep_pattern_found )
+        { grep_args.push_back( arg ); grep_pattern_found = true; continue; }
+      else break;					// no more options
       }
-    }
+    switch( program_mode )
+      {
+      case m_none: internal_error( "invalid operation" );
+      case m_zcat:
+        switch( code )
+          {
+          case 'A': cat_options.show_ends = true;
+                    cat_options.show_nonprinting = true;
+                    cat_options.show_tabs = true; break;
+          case 'b': cat_options.number_lines = 1; break;
+          case 'c': break;
+          case 'd': break;
+          case 'e': cat_options.show_nonprinting = true;  // fall through
+          case 'E': cat_options.show_ends = true; break;
+          case 'f': break;
+          case 'h': show_zcat_help(); return 0;
+          case 'l': break;
+          case 'L': break;
+          case 'n': if( cat_options.number_lines == 0 )
+                      { cat_options.number_lines = 2; } break;
+          case 'q': verbosity = -1; break;
+          case 'r': recursive = true; break;
+          case 's': cat_options.squeeze_blank = true; break;
+          case 't': cat_options.show_nonprinting = true;  // fall through
+          case 'T': cat_options.show_tabs = true; break;
+          case 'v': cat_options.show_nonprinting = true; break;
+          case 'V': show_version( "Zcat" ); return 0;
+          case verbose_opt : if( verbosity < 4 ) ++verbosity; break;
+          case zcat_opt : break;
+          default : internal_error( "uncaught option" );
+          } break;
+      case m_zgrep:
+        switch( code )
+          {
+          case 'a': grep_args.push_back( "-a" ); break;
+          case 'A': grep_args.push_back( "-A" ); grep_args.push_back( arg ); break;
+          case 'b': grep_args.push_back( "-b" ); break;
+          case 'B': grep_args.push_back( "-B" ); grep_args.push_back( arg ); break;
+          case 'c': grep_args.push_back( "-c" ); break;
+          case 'C': grep_args.push_back( "-C" ); grep_args.push_back( arg ); break;
+          case 'e': grep_args.push_back( "-e" ); grep_args.push_back( arg );
+                    grep_pattern_found = true; break;
+          case 'E': grep_args.push_back( "-E" ); break;
+          case 'f': grep_args.push_back( "-f" ); grep_args.push_back( arg );
+                    grep_pattern_found = true; break;
+          case 'F': grep_args.push_back( "-F" ); break;
+          case 'h': grep_show_name = false; break;
+          case 'H': grep_show_name = true; break;
+          case 'i': grep_args.push_back( "-i" ); break;
+          case 'I': grep_args.push_back( "-I" ); break;
+          case 'l': grep_args.push_back( "-l" ); grep_list = true; break;
+          case 'L': grep_args.push_back( "-L" ); grep_list = true; break;
+          case 'm': grep_args.push_back( "-m" ); grep_args.push_back( arg ); break;
+          case 'n': grep_args.push_back( "-n" ); break;
+          case 'o': grep_args.push_back( "-o" ); break;
+          case 'q': grep_args.push_back( "-q" ); verbosity = -1; break;
+          case 'r': recursive = true; break;
+          case 's': grep_args.push_back( "-s" ); verbosity = -1; break;
+          case 'v': grep_args.push_back( "-v" ); break;
+          case 'V': show_version( "Zgrep" ); return 0;
+          case 'w': grep_args.push_back( "-w" ); break;
+          case 'x': grep_args.push_back( "-x" ); break;
+          case help_opt    : show_zgrep_help(); return 0;
+          case verbose_opt : if( verbosity < 4 ) ++verbosity; break;
+          case zgrep_opt   : break;
+          default : internal_error( "uncaught option" );
+          } break;
+      case m_ztest:
+        switch( code )
+          {
+          case 'h': show_ztest_help(); return 0;
+          case 'q': verbosity = -1; ztest_args.push_back( "-q" ); break;
+          case 'r': recursive = true; break;
+          case 'v': if( verbosity < 4 ) ++verbosity;
+                    ztest_args.push_back( "-v" ); break;
+          case 'V': show_version( "Ztest" ); return 0;
+          case ztest_opt : break;
+          default : internal_error( "uncaught option" );
+          } break;
+      }
+    } // end process options
 
-  if( magic_type.size() ) return print_magic_type( magic_type );
+  if( program_mode == m_zgrep && !grep_pattern_found )
+    { show_error( "Pattern not found.", 0, true ); return 2; }
 
   bool filenames_given = false;
   for( ; argind < parser.arguments(); ++argind )
@@ -725,96 +350,87 @@ int main( const int argc, const char * argv[] )
     }
 
   if( filenames.empty() ) filenames.push_back("-");
-  if( filenames_given ) set_signals();
 
-  Pretty_print pp( filenames );
-  if( program_mode == m_test )
-    outhandle = -1;
-
-  int retval = 0;
-  for( unsigned int i = 0; i < filenames.size(); ++i )
+  int retval = ( ( program_mode == m_zgrep ) ? 1 : 0 );
+  while( !filenames.empty() )
     {
-    struct stat in_stats;
-    output_filename.clear();
-
-    if( !filenames[i].size() || filenames[i] == "-" )
+    input_filename = filenames.front();
+    filenames.pop_front();
+    if( !input_filename.size() || input_filename == "-" )
       {
       input_filename.clear();
-      inhandle = STDIN_FILENO;
-      if( program_mode != m_test )
-        {
-        if( to_stdout || !default_output_filename.size() )
-          outhandle = STDOUT_FILENO;
-        else
-          {
-          if( program_mode == m_compress )
-            set_c_outname( default_output_filename );
-          else output_filename = default_output_filename;
-          if( !open_outstream( force ) )
-            {
-            if( outhandle == -1 && retval < 1 ) retval = 1;
-            close( inhandle ); inhandle = -1;
-            continue;
-            }
-          }
-        }
+      infd = STDIN_FILENO;
       }
     else
       {
-      input_filename = filenames[i];
-      const int eindex = extension_index( input_filename );
-      inhandle = open_instream( input_filename, &in_stats, program_mode,
-                                eindex, force, to_stdout );
-      if( inhandle < 0 ) { if( retval < 1 ) retval = 1; continue; }
-      if( program_mode != m_test )
+      if( recursive )
         {
-        if( to_stdout ) outhandle = STDOUT_FILENO;
-        else
+        struct stat st;
+        if( !stat( input_filename.c_str(), &st ) && S_ISDIR( st.st_mode ) )
           {
-          if( program_mode == m_compress )
-            set_c_outname( input_filename );
-          else set_d_outname( input_filename, eindex );
-          if( !open_outstream( force ) )
+          DIR * const dirp = opendir( input_filename.c_str() );
+          if( !dirp )
             {
-            if( outhandle == -1 && retval < 1 ) retval = 1;
-            close( inhandle ); inhandle = -1;
-            continue;
+            if( verbosity >= 0 )
+              std::fprintf( stderr, "%s: Can't open directory `%s': %s.\n",
+                util_name, input_filename.c_str(), std::strerror( errno ) );
+            if( retval < 1 ) retval = 1; continue;
             }
+          std::list< std::string > tmp_list;
+          while( true )
+            {
+            const struct dirent * const entryp = readdir( dirp );
+            if( !entryp ) { closedir( dirp ); break; }
+            std::string tmp_name( entryp->d_name );
+            if( tmp_name != "." && tmp_name != ".." )
+              tmp_list.push_back( input_filename + "/" + tmp_name );
+            }
+          filenames.splice( filenames.begin(), tmp_list );
+          continue;
           }
         }
+      infd = open_instream( input_filename, program_mode );
+      if( infd < 0 ) { if( retval < 1 ) retval = 1; continue; }
       }
 
-    if( !check_tty( inhandle, program_mode ) ) return 1;
-
-    if( output_filename.size() && !to_stdout && program_mode != m_test )
-      delete_output_on_interrupt = true;
-//    const struct stat * in_statsp = input_filename.size() ? &in_stats : 0;
-    pp.set_name( input_filename );
     int tmp = 0;
     switch( program_mode )
       {
-      case m_compress:
-        /*tmp = compress( inhandle, pp, in_statsp, &retval );*/ break;
-      case m_decompress:
-        /*tmp = decompress( inhandle, pp );*/ break;
-      case m_test:
-        if( inhandle == STDIN_FILENO )
-          tmp = test_stdin_type( inhandle, pp );
-        else tmp = test_type( inhandle, pp );
+      case m_none:
+        break;
+      case m_zcat:
+        tmp = cat( infd, input_filename, cat_options );
+        break;
+      case m_zgrep:
+        if( infd == STDIN_FILENO )
+          tmp = zgrep_stdin( infd, grep_args );
+        else tmp = zgrep_file( infd, input_filename, grep_args,
+                               grep_list, grep_show_name );
+        break;
+      case m_ztest:
+        if( infd == STDIN_FILENO )
+          tmp = ztest_stdin( infd, ztest_args );
+        else tmp = ztest_file( infd, input_filename, ztest_args );
         break;
       }
-    if( tmp > retval ) retval = tmp;
-    if( tmp && program_mode != m_test ) cleanup_and_fail( retval );
+    if( program_mode == m_zgrep )
+      { if( tmp == 0 || ( tmp == 2 && retval == 1 ) ) retval = tmp; }
+    else if( tmp > retval ) retval = tmp;
 
-//    if( delete_output_on_interrupt )
-//      close_and_set_permissions( in_statsp, &retval );
     if( input_filename.size() )
+      { close( infd ); infd = -1; }
+    }
+
+  if( std::fclose( stdout ) != 0 )
+    {
+    show_error( "Can't close stdout", errno );
+    switch( program_mode )
       {
-      close( inhandle ); inhandle = -1;
-      if( !keep_input_files && !to_stdout && program_mode != m_test )
-        std::remove( input_filename.c_str() );
+      case m_none: break;
+      case m_zcat: retval = 1; break;
+      case m_zgrep: if( retval != 0 || verbosity >= 0 ) retval = 2; break;
+      case m_ztest: if( retval == 0 ) retval = 1; break;
       }
     }
-  if( outhandle >= 0 ) close( outhandle );
   return retval;
   }