1 files changed, 70 insertions, 0 deletions
diff --git a/zcmpdiff.cc b/zcmpdiff.cc
new file mode 100644
index 0000000..fceb8cf
--- /dev/null
+++ b/zcmpdiff.cc
@@ -0,0 +1,70 @@
+/* Common code for zcmp and zdiff
+   Copyright (C) 2010-2021 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
+   the Free Software Foundation, either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+
+int open_instream( const std::string & input_filename )
+  {
+  const int infd = open( input_filename.c_str(), O_RDONLY | O_BINARY );
+  if( infd < 0 )
+    show_file_error( input_filename.c_str(), "Can't open input file", errno );
+  return infd;
+  }
+
+
+int open_other_instream( std::string & name )
+  {
+  const int eindex = extension_index( name );
+  if( eindex >= 0 && enabled_format( -1 ) )
+    {					// open uncompressed version
+    name.resize( name.size() - std::strlen( extension_from( eindex ) ) );
+    name += extension_to( eindex );
+    return open( name.c_str(), O_RDONLY | O_BINARY );
+    }
+  if( eindex < 0 )			// search compressed version
+    for( int i = 0; i < num_formats; ++i )
+      if( enabled_format( format_order[i] ) )
+        {
+        const std::string s( name + simple_extensions[format_order[i]] );
+        const int infd = open( s.c_str(), O_RDONLY | O_BINARY );
+        if( infd >= 0 ) { name = s; return infd; }
+        }
+  return -1;
+  }
+
+
+void parse_format_types2( const std::string & arg, int format_types[2] )
+  {
+  const unsigned i = std::min( arg.find( ',' ), arg.size() );
+  if( i > 0 ) format_types[0] = parse_format_type( arg.substr( 0, i ) );
+  else format_types[0] = -1;
+  if( i + 1 < arg.size() ) format_types[1] =
+    parse_format_type( arg.substr( i + 1 ) );
+  else format_types[1] = -1;
+  }
+
+
+bool check_identical( const char * const name1, const char * const name2 )
+  {
+  if( std::strcmp( name1, name2 ) == 0 ) return true;
+  struct stat stat1, stat2;
+  if( stat( name1, &stat1 ) || stat( name2, &stat2 ) ) return false;
+  return ( stat1.st_ino == stat2.st_ino && stat1.st_dev == stat2.st_dev );
+  }