/* pbmtoplot.c - read a portable bitmap and produce a UNIX-format plot file.
**
** Copyright (C) 1990 by Arthur David Olson.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation.  This software is provided "as is" without express or
** implied warranty.
*/

#include <stdio.h>
#include "pbm.h"

static void
puttwo( int i )
    {
    (void) putchar(i);
    (void) putchar(i >> 8);
    }

int
main( int argc, char* argv[] )
    {
    FILE* ifp;
    register bit* bitrow;
    register int row, col, scol;
    int	rows, cols, format;

    pbm_init( &argc, argv );

    if ( argc > 2 )
	pm_usage( "[pbmfile]" );

    ifp = (argc == 2) ? pm_openr( argv[1] ) : stdin;

    pbm_readpbminit( ifp, &cols, &rows, &format );
    bitrow = pbm_allocrow( cols );

    (void) putchar( 's' );
    puttwo( 0 );
    puttwo( 0 );
    puttwo( rows - 1 );
    puttwo( cols - 1 );
    for ( row = 0; row < rows; ++row )
	{
	pbm_readpbmrow( ifp, bitrow, cols, format );
	for ( col = 0; col < cols; ++col )
	    {
	    if ( bitrow[col] == PBM_WHITE )
		continue;
	    scol = col;
	    while ( ++col < cols && bitrow[col] == PBM_BLACK )
		continue;
	    --col;
	    if ( col == scol )
		(void) putchar( 'p' );
	    else
		{
		(void) putchar( 'l' );
		puttwo( scol );
		puttwo( rows - 1 - row );
		}
	    puttwo( col );
	    puttwo( rows - 1 - row );
	    }
	}

    pm_closer( ifp );
    exit( 0 );
    }