usr.sbin/lpr/filters/lpf.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)lpf.c    8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.sbin/lpr/filters/lpf.c,v 1.6.2.2 2001/10/13 19:01:45 gad Exp $
  32  * $DragonFly: src/usr.sbin/lpr/filters/lpf.c,v 1.3 2004/03/22 22:32:50 cpressey Exp $
  33  */
  34
  35 /*
  36  *      filter which reads the output of nroff and converts lines
  37  *      with ^H's to overwritten lines.  Thus this works like 'ul'
  38  *      but is much better: it can handle more than 2 overwrites
  39  *      and it is written with some style.
  40  *      modified by kls to use register references instead of arrays
  41  *      to try to gain a little speed.
  42  *      further modified to let the compiler figure out which
  43  *      variables should be registers; they're very good at it these days.
  44  */
  45
  46 #include <signal.h>
  47 #include <unistd.h>
  48 #include <stdlib.h>
  49 #include <stdio.h>
  50
  51 #define MAXWIDTH  132
  52 #define MAXREP    10
  53
  54 char    buf[MAXREP][MAXWIDTH];
  55 int     maxcol[MAXREP] = {-1};
  56 int     lineno;
  57 int     width = 132;    /* default line length */
  58 int     length = 66;    /* page length */
  59 int     indent;         /* indentation length */
  60 int     npages = 1;
  61 int     literal;        /* print control characters */
  62 char    *name;          /* user's login name */
  63 char    *host;          /* user's machine name */
  64 char    *acctfile;      /* accounting information file */
  65
  66 int
  67 main(int argc, char **argv)
  68 {
  69         FILE *p = stdin, *o = stdout;
  70         int i, col;
  71         char *cp;
  72         int done, linedone, maxrep;
  73         char *limit;
  74         int ch;
  75
  76         while (--argc) {
  77                 if (*(cp = *++argv) == '-') {
  78                         switch (cp[1]) {
  79                         case 'n':
  80                                 argc--;
  81                                 name = *++argv;
  82                                 break;
  83
  84                         case 'h':
  85                                 argc--;
  86                                 host = *++argv;
  87                                 break;
  88
  89                         case 'w':
  90                                 if ((i = atoi(&cp[2])) > 0 && i <= MAXWIDTH)
  91                                         width = i;
  92                                 break;
  93
  94                         case 'l':
  95                                 length = atoi(&cp[2]);
  96                                 break;
  97
  98                         case 'i':
  99                                 indent = atoi(&cp[2]);
 100                                 break;
 101
 102                         case 'c':       /* Print control chars */
 103                                 literal++;
 104                                 break;
 105                         }
 106                 } else
 107                         acctfile = cp;
 108         }
 109
 110         for (cp = buf[0], limit = buf[MAXREP]; cp < limit; *cp++ = ' ');
 111         done = 0;
 112
 113         while (!done) {
 114                 col = indent;
 115                 maxrep = -1;
 116                 linedone = 0;
 117                 while (!linedone) {
 118                         switch (ch = getc(p)) {
 119                         case EOF:
 120                                 linedone = done = 1;
 121                                 ch = '\n';
 122                                 break;
 123
 124                         case '\f':
 125                                 lineno = length;
 126                         case '\n':
 127                                 if (maxrep < 0)
 128                                         maxrep = 0;
 129                                 linedone = 1;
 130                                 break;
 131
 132                         case '\b':
 133                                 if (--col < indent)
 134                                         col = indent;
 135                                 break;
 136
 137                         case '\r':
 138                                 col = indent;
 139                                 break;
 140
 141                         case '\t':
 142                                 col = ((col - indent) | 07) + indent + 1;
 143                                 break;
 144
 145                         case '\031':
 146                                 /*
 147                                  * lpd needs to use a different filter to
 148                                  * print data so stop what we are doing and
 149                                  * wait for lpd to restart us.
 150                                  */
 151                                 if ((ch = getchar()) == '\1') {
 152                                         fflush(stdout);
 153                                         kill(getpid(), SIGSTOP);
 154                                         break;
 155                                 } else {
 156                                         ungetc(ch, stdin);
 157                                         ch = '\031';
 158                                 }
 159
 160                         default:
 161                                 if (col >= width || (!literal && ch < ' ')) {
 162                                         col++;
 163                                         break;
 164                                 }
 165                                 cp = &buf[0][col];
 166                                 for (i = 0; i < MAXREP; i++) {
 167                                         if (i > maxrep)
 168                                                 maxrep = i;
 169                                         if (*cp == ' ') {
 170                                                 *cp = ch;
 171                                                 if (col > maxcol[i])
 172                                                         maxcol[i] = col;
 173                                                 break;
 174                                         }
 175                                         cp += MAXWIDTH;
 176                                 }
 177                                 col++;
 178                                 break;
 179                         }
 180                 }
 181
 182                 /* print out lines */
 183                 for (i = 0; i <= maxrep; i++) {
 184                         for (cp = buf[i], limit = cp+maxcol[i]; cp <= limit;) {
 185                                 putc(*cp, o);
 186                                 *cp++ = ' ';
 187                         }
 188                         if (i < maxrep)
 189                                 putc('\r', o);
 190                         else
 191                                 putc(ch, o);
 192                         if (++lineno >= length) {
 193                                 fflush(o);
 194                                 npages++;
 195                                 lineno = 0;
 196                         }
 197                         maxcol[i] = -1;
 198                 }
 199         }
 200         if (lineno) {           /* be sure to end on a page boundary */
 201                 putchar('\f');
 202                 npages++;
 203         }
 204         if (name && acctfile && access(acctfile, 02) >= 0 &&
 205             freopen(acctfile, "a", stdout) != NULL) {
 206                 printf("%7.2f\t%s:%s\n", (float)npages, host, name);
 207         }
 208         exit(0);
 209 }