From: arthur@turing.ac.uk (Arthur van Hoff)
Subject: PDB -- ANSI-C to PostScript compiler
Reply-To: arthur@turing.ac.uk (Arthur van Hoff)
Organization: The Turing Institute Ltd., Glasgow, Scotland
Date: Thu, 21 Jan 1993 12:52:14 GMT
Keywords: interpreter, available

Hi PostScript Hackers,

PdB version 2.1 (ANSI-C to PostScript compiler) is now available via
anonymous ftp from:

	 turing.com (192.133.90.28) in pub/pdb2.1-demo.tar.Z
	 ftp.uu.net (192.48.96.9) in graphics/NeWS/pdb2.1-demo.tar.Z

There is no more need to write PostScript! Start using PdB right now!  PdB
is an optimizing compiler to compile ANSI-C (like) code into Adobe
compatible PostScript. It includes executables, examples and many useful
header files. Note that it is not dependend on NeWS.

The release of version 2.1 includes:

- Binaries for Sun SPARC station and IBM RS6000.
- Include files for Abobe PostScript level I.
- Include files for NeWS upto version 3.1.
- Include files for TNT upto version 3.1.
- Support for CPS OpenWindows upto version 3.1.
- Support NeWS classing in a C++ manner.
- Plenty of examples of all the above functions.
- NeWS/OpenWindows test suite.
- PostScript reference manual.
- UNIX manual pages.

Below are some examples of PdB code together with the PostScript
produced by the compiler.

Have fun,

	Arthur van Hoff
	pdb@turing.com

################################
Code to draw a star shape in PdB
################################

#include <graphics.h>
 
void starpath(int ang)
{
        int i;
 
        newpath();
        moveto(100,100);
        for (i = 1 ; i <= (int)(360 / ang) ; i++) {
                rotate(180 + ang);
                rlineto(100,0);
        }
        setgray(0);
        stroke();
}

########################
Verbatim Compiler output
########################

/starpath {
  % int --
  newpath 100 100 moveto 1 360 2 index div cvi exch sub 1 add 0 max {
    dup 180 add rotate 100 0 rlineto
  } repeat
  pop 0 setgray stroke
} def

###########################
Code for bubble-sort in PdB
###########################

#include <postscript.h>
 
/******************************************************
 * Bubble sort (page 66)
 * From: Algorithms + Data Structures = Programs
 *       Nicklaus Wirth
 */
 
void bubblesort(int *a)
{
        int i, j;
 
        for (i = length(a)-1 ; i > 1 ; i--)
                for (j = 0 ; j < i ; j++)
                        if (a[j] > a[j+1]) {
                                int x = a[j+1];
                                a[j+1] = a[j];
                                a[j] = x;
                        }
}

########################
Verbatim Compiler output
########################

/bubblesort {
  % int * --
  dup length 1 sub -1 2 {
    0 1 3 -1 roll 1 sub {
      2 copy get 2 index 2 index 1 add get gt {
        2 copy 1 add get 2 index 2 index 1 add 4 index 4 index get put
        2 index 3 1 roll put
      } {pop} ifelse
    } for
  } for
  pop
} def

--
Arthur van Hoff 
The Turing Institute Limited
36 North Hanover Street, 
G1 2AD Glasgow, Scotland

Tel: +44 41 552 8858 or +44 41 552 6400  Fax: +44 41 552 2985
Email: arthur@turing.com
-- 
Send compilers articles to compilers@iecc.cambridge.ma.us or
{ima | spdcc | world}!iecc!compilers.  Meta-mail to compilers-request.