BSD 4_3_Net_2 release

[unix-history] / usr / src / usr.sbin / lpr / filters / lpf.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)lpf.c       5.4 (Berkeley) 6/1/90";
#endif /* not lint */

/*
*      filter which reads the output of nroff and converts lines
*      with ^H's to overwritten lines.  Thus this works like 'ul'
*      but is much better: it can handle more than 2 overwrites
*      and it is written with some style.
*      modified by kls to use register references instead of arrays
*      to try to gain a little speed.
*/

#include <stdio.h>
#include <signal.h>

#define MAXWIDTH  132
#define MAXREP    10

char    buf[MAXREP][MAXWIDTH];
int     maxcol[MAXREP] = {-1};
int     lineno;
int     width = 132;    /* default line length */
int     length = 66;    /* page length */
int     indent;         /* indentation length */
int     npages = 1;
int     literal;        /* print control characters */
char    *name;          /* user's login name */
char    *host;          /* user's machine name */
char    *acctfile;      /* accounting information file */

main(argc, argv) 
       int argc;
       char *argv[];
{
       register FILE *p = stdin, *o = stdout;
       register int i, col;
       register char *cp;
       int done, linedone, maxrep;
       char ch, *limit;

       while (--argc) {
               if (*(cp = *++argv) == '-') {
                       switch (cp[1]) {
                       case 'n':
                               argc--;
                               name = *++argv;
                               break;

                       case 'h':
                               argc--;
                               host = *++argv;
                               break;

                       case 'w':
                               if ((i = atoi(&cp[2])) > 0 && i <= MAXWIDTH)
                                       width = i;
                               break;

                       case 'l':
                               length = atoi(&cp[2]);
                               break;

                       case 'i':
                               indent = atoi(&cp[2]);
                               break;

                       case 'c':       /* Print control chars */
                               literal++;
                               break;
                       }
               } else
                       acctfile = cp;
       }

       for (cp = buf[0], limit = buf[MAXREP]; cp < limit; *cp++ = ' ');
       done = 0;
       
       while (!done) {
               col = indent;
               maxrep = -1;
               linedone = 0;
               while (!linedone) {
                       switch (ch = getc(p)) {
                       case EOF:
                               linedone = done = 1;
                               ch = '\n';
                               break;

                       case '\f':
                               lineno = length;
                       case '\n':
                               if (maxrep < 0)
                                       maxrep = 0;
                               linedone = 1;
                               break;

                       case '\b':
                               if (--col < indent)
                                       col = indent;
                               break;

                       case '\r':
                               col = indent;
                               break;

                       case '\t':
                               col = ((col - indent) | 07) + indent + 1;
                               break;

                       case '\031':
                               /*
                                * lpd needs to use a different filter to
                                * print data so stop what we are doing and
                                * wait for lpd to restart us.
                                */
                               if ((ch = getchar()) == '\1') {
                                       fflush(stdout);
                                       kill(getpid(), SIGSTOP);
                                       break;
                               } else {
                                       ungetc(ch, stdin);
                                       ch = '\031';
                               }

                       default:
                               if (col >= width || !literal && ch < ' ') {
                                       col++;
                                       break;
                               }
                               cp = &buf[0][col];
                               for (i = 0; i < MAXREP; i++) {
                                       if (i > maxrep)
                                               maxrep = i;
                                       if (*cp == ' ') {
                                               *cp = ch;
                                               if (col > maxcol[i])
                                                       maxcol[i] = col;
                                               break;
                                       }
                                       cp += MAXWIDTH;
                               }
                               col++;
                               break;
                       }
               }

               /* print out lines */
               for (i = 0; i <= maxrep; i++) {
                       for (cp = buf[i], limit = cp+maxcol[i]; cp <= limit;) {
                               putc(*cp, o);
                               *cp++ = ' ';
                       }
                       if (i < maxrep)
                               putc('\r', o);
                       else
                               putc(ch, o);
                       if (++lineno >= length) {
                               fflush(o);
                               npages++;
                               lineno = 0;
                       }
                       maxcol[i] = -1;
               }
       }
       if (lineno) {           /* be sure to end on a page boundary */
               putchar('\f');
               npages++;
       }
       if (name && acctfile && access(acctfile, 02) >= 0 &&
           freopen(acctfile, "a", stdout) != NULL) {
               printf("%7.2f\t%s:%s\n", (float)npages, host, name);
       }
       exit(0);
}