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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)lpf.c    8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.sbin/lpr/filters/lpf.c,v 1.6.2.2 2001/10/13 19:01:45 gad Exp $
  36  * $DragonFly: src/usr.sbin/lpr/filters/lpf.c,v 1.3 2004/03/22 22:32:50 cpressey Exp $
  37  */
  38
  39 /*
  40  *      filter which reads the output of nroff and converts lines
  41  *      with ^H's to overwritten lines.  Thus this works like 'ul'
  42  *      but is much better: it can handle more than 2 overwrites
  43  *      and it is written with some style.
  44  *      modified by kls to use register references instead of arrays
  45  *      to try to gain a little speed.
  46  *      further modified to let the compiler figure out which
  47  *      variables should be registers; they're very good at it these days.
  48  */
  49
  50 #include <signal.h>
  51 #include <unistd.h>
  52 #include <stdlib.h>
  53 #include <stdio.h>
  54
  55 #define MAXWIDTH  132
  56 #define MAXREP    10
  57
  58 char    buf[MAXREP][MAXWIDTH];
  59 int     maxcol[MAXREP] = {-1};
  60 int     lineno;
  61 int     width = 132;    /* default line length */
  62 int     length = 66;    /* page length */
  63 int     indent;         /* indentation length */
  64 int     npages = 1;
  65 int     literal;        /* print control characters */
  66 char    *name;          /* user's login name */
  67 char    *host;          /* user's machine name */
  68 char    *acctfile;      /* accounting information file */
  69
  70 int
  71 main(int argc, char **argv)
  72 {
  73         FILE *p = stdin, *o = stdout;
  74         int i, col;
  75         char *cp;
  76         int done, linedone, maxrep;
  77         char *limit;
  78         int ch;
  79
  80         while (--argc) {
  81                 if (*(cp = *++argv) == '-') {
  82                         switch (cp[1]) {
  83                         case 'n':
  84                                 argc--;
  85                                 name = *++argv;
  86                                 break;
  87
  88                         case 'h':
  89                                 argc--;
  90                                 host = *++argv;
  91                                 break;
  92
  93                         case 'w':
  94                                 if ((i = atoi(&cp[2])) > 0 && i <= MAXWIDTH)
  95                                         width = i;
  96                                 break;
  97
  98                         case 'l':
  99                                 length = atoi(&cp[2]);
 100                                 break;
 101
 102                         case 'i':
 103                                 indent = atoi(&cp[2]);
 104                                 break;
 105
 106                         case 'c':       /* Print control chars */
 107                                 literal++;
 108                                 break;
 109                         }
 110                 } else
 111                         acctfile = cp;
 112         }
 113
 114         for (cp = buf[0], limit = buf[MAXREP]; cp < limit; *cp++ = ' ');
 115         done = 0;
 116
 117         while (!done) {
 118                 col = indent;
 119                 maxrep = -1;
 120                 linedone = 0;
 121                 while (!linedone) {
 122                         switch (ch = getc(p)) {
 123                         case EOF:
 124                                 linedone = done = 1;
 125                                 ch = '\n';
 126                                 break;
 127
 128                         case '\f':
 129                                 lineno = length;
 130                         case '\n':
 131                                 if (maxrep < 0)
 132                                         maxrep = 0;
 133                                 linedone = 1;
 134                                 break;
 135
 136                         case '\b':
 137                                 if (--col < indent)
 138                                         col = indent;
 139                                 break;
 140
 141                         case '\r':
 142                                 col = indent;
 143                                 break;
 144
 145                         case '\t':
 146                                 col = ((col - indent) | 07) + indent + 1;
 147                                 break;
 148
 149                         case '\031':
 150                                 /*
 151                                  * lpd needs to use a different filter to
 152                                  * print data so stop what we are doing and
 153                                  * wait for lpd to restart us.
 154                                  */
 155                                 if ((ch = getchar()) == '\1') {
 156                                         fflush(stdout);
 157                                         kill(getpid(), SIGSTOP);
 158                                         break;
 159                                 } else {
 160                                         ungetc(ch, stdin);
 161                                         ch = '\031';
 162                                 }
 163
 164                         default:
 165                                 if (col >= width || (!literal && ch < ' ')) {
 166                                         col++;
 167                                         break;
 168                                 }
 169                                 cp = &buf[0][col];
 170                                 for (i = 0; i < MAXREP; i++) {
 171                                         if (i > maxrep)
 172                                                 maxrep = i;
 173                                         if (*cp == ' ') {
 174                                                 *cp = ch;
 175                                                 if (col > maxcol[i])
 176                                                         maxcol[i] = col;
 177                                                 break;
 178                                         }
 179                                         cp += MAXWIDTH;
 180                                 }
 181                                 col++;
 182                                 break;
 183                         }
 184                 }
 185
 186                 /* print out lines */
 187                 for (i = 0; i <= maxrep; i++) {
 188                         for (cp = buf[i], limit = cp+maxcol[i]; cp <= limit;) {
 189                                 putc(*cp, o);
 190                                 *cp++ = ' ';
 191                         }
 192                         if (i < maxrep)
 193                                 putc('\r', o);
 194                         else
 195                                 putc(ch, o);
 196                         if (++lineno >= length) {
 197                                 fflush(o);
 198                                 npages++;
 199                                 lineno = 0;
 200                         }
 201                         maxcol[i] = -1;
 202                 }
 203         }
 204         if (lineno) {           /* be sure to end on a page boundary */
 205                 putchar('\f');
 206                 npages++;
 207         }
 208         if (name && acctfile && access(acctfile, 02) >= 0 &&
 209             freopen(acctfile, "a", stdout) != NULL) {
 210                 printf("%7.2f\t%s:%s\n", (float)npages, host, name);
 211         }
 212         exit(0);
 213 }