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linebuffer.cpp

/***************************************************************
 *
 * Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************/


#include "condor_common.h"
#include "condor_debug.h"
#include "linebuffer.h"

// Constructor
LineBuffer::
LineBuffer( int maxsize )
{
      // TODO This is fubar but it works for now TODO
      //bufptr = buffer = (char *) malloc( maxsize + 1 );
      bufptr = buffer = (char *) malloc( maxsize + 1 );
      assert( buffer );
      bufsize = maxsize;
      bufcount = 0;
}

// Destructor
LineBuffer::
~LineBuffer( void )
{
      free( buffer );
}

// Buffer a block of data
int
LineBuffer::
Buffer( const char ** buf, int *nptr )
{
      const char  *bptr = *buf;
      int               nbytes = *nptr;

      // Loop through the whole input buffer
      while( nbytes-- ) {
            int status = Buffer( *bptr++ );
            if ( status ) {
                  *buf = bptr;
                  *nptr = nbytes;
                  return status;
            }
      }
      *nptr = 0;
      return 0;
}

// Buffer a single byte
int
LineBuffer::
Buffer( char c )
{
      if (  ( '\n' == c ) || ( '\0' == c ) || ( bufcount >= bufsize ) ) {
            return DoOutput( false );
      } else {
            *bufptr = c;
            bufptr++;
            bufcount++;
            return 0;
      }
}

// Flush the input buffer
int
LineBuffer::
Flush( void )
{
      return DoOutput( false );
}

// Send out data
int
LineBuffer::
DoOutput( bool force ) {

      // If there is data, or we're in force, just do it..
      if ( ( bufcount ) || ( force )  ) {
            *bufptr = '\0';
            int status = Output( buffer, bufcount );
            bufptr = buffer;
            bufcount = 0;
            return status;
      }
      return 0;

}

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