danjudd@thor.stolaf.edu (Dan Judd) (05/26/89)
In volume 15 of comp.sources.unix there is a ditroff to postscript package,
that also includes an ascii to postscript converter called lpscript.
lpscript as is does not support backspaces, instead it just prints a question
mark. This causes programs that do their own underlining via the backspace
underscore method to look pretty ugly.
I modified lpscript.c to handle backspaces. Only Courier, the default font,
is handled absolutely correct because it is the only fixed-width font. The
other fonts will have some variation of effect due to the changes in width
from character to character.
All the changes are #ifdef'd on STO
Dan Judd, St. Olaf College 5/25/1989
danjudd@thor.acc.stolaf.edu
-----------cut here for patch, your numbers may vary --------------------------
*** lpscript.org.c Mon May 22 14:27:13 1989
--- lpscript.c Thu May 25 16:21:42 1989
***************
*** 14,19 ****
--- 14,20 ----
#include <stdio.h>
#include "pscript.h"
+ #define STO
#define PAGEOFFSET (1.0*PU_CM)
#define FONTSIZE 12.0 /* default font size (in points) */
#define TABSIZE 8
***************
*** 188,194 ****
--- 189,199 ----
putc('(', postr);
prefix = 1;
}
+ #ifdef STO
+ if(ch < ' ' && ch != '\b' && ch != '\t' && ch != '\n' && ch != '\r' && ch != '\f')
+ #else
if(ch < ' ' && ch != '\t' && ch != '\n' && ch != '\r' && ch != '\f')
+ #endif
ch = '?';
switch(ch)
{
***************
*** 215,220 ****
--- 220,232 ----
fprintf(postr, ")n dpage\n");
prefix = 0;
break;
+ #ifdef STO
+ case '\b':
+ x = 0;
+ fprintf(postr, ")bs\n");
+ prefix = 0;
+ break;
+ #endif
default:
pch(ch);
x++;
***************
*** 281,286 ****
--- 293,304 ----
fprintf(postr, "/pgbot currentfont /FontBBox get 1 get neg 1000 div %.1f mul def\n", fontsize * aspect);
/* apply horizontal offset, if any */
fprintf(postr, "%.1f 0 translate\n", pageoffset);
+ #ifdef STO
+ /* figure out how big a _ is so the backspace will work right */
+ fprintf(postr, "/offset (_) stringwidth pop neg def\n");
+ /* define bs so so only 4 extra chars have to be sent for backspace*/
+ fprintf(postr, "/bs\n{ show\noffset 0 rmoveto\n} def");
+ #endif
/* save state */
endinit();