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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  * 4. 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
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1983, 1993\n\
33         The Regents of the University of California.  All rights reserved.\n";
34 #endif /* not lint */
35
36 #if 0
37 #ifndef lint
38 static char sccsid[] = "@(#)lpf.c       8.1 (Berkeley) 6/6/93";
39 #endif /* not lint */
40 #endif
41
42 #include "lp.cdefs.h"           /* A cross-platform version of <sys/cdefs.h> */
43 __FBSDID("$FreeBSD$");
44
45 /*
46  *      filter which reads the output of nroff and converts lines
47  *      with ^H's to overwritten lines.  Thus this works like 'ul'
48  *      but is much better: it can handle more than 2 overwrites
49  *      and it is written with some style.
50  *      modified by kls to use register references instead of arrays
51  *      to try to gain a little speed.
52  */
53
54 #include <signal.h>
55 #include <unistd.h>
56 #include <stdlib.h>
57 #include <stdio.h>
58
59 #define MAXWIDTH  132
60 #define MAXREP    10
61
62 char    buf[MAXREP][MAXWIDTH];
63 int     maxcol[MAXREP] = {-1};
64 int     lineno;
65 int     width = 132;    /* default line length */
66 int     length = 66;    /* page length */
67 int     indent;         /* indentation length */
68 int     npages = 1;
69 int     literal;        /* print control characters */
70 char    *name;          /* user's login name */
71 char    *host;          /* user's machine name */
72 char    *acctfile;      /* accounting information file */
73
74 int
75 main(int argc, char *argv[])
76 {
77         register FILE *p = stdin, *o = stdout;
78         register int i, col;
79         register char *cp;
80         int done, linedone, maxrep;
81         char *limit;
82         int ch;
83
84         while (--argc) {
85                 if (*(cp = *++argv) == '-') {
86                         switch (cp[1]) {
87                         case 'n':
88                                 argc--;
89                                 name = *++argv;
90                                 break;
91
92                         case 'h':
93                                 argc--;
94                                 host = *++argv;
95                                 break;
96
97                         case 'w':
98                                 if ((i = atoi(&cp[2])) > 0 && i <= MAXWIDTH)
99                                         width = i;
100                                 break;
101
102                         case 'l':
103                                 length = atoi(&cp[2]);
104                                 break;
105
106                         case 'i':
107                                 indent = atoi(&cp[2]);
108                                 break;
109
110                         case 'c':       /* Print control chars */
111                                 literal++;
112                                 break;
113                         }
114                 } else
115                         acctfile = cp;
116         }
117
118         for (cp = buf[0], limit = buf[MAXREP]; cp < limit; *cp++ = ' ');
119         done = 0;
120
121         while (!done) {
122                 col = indent;
123                 maxrep = -1;
124                 linedone = 0;
125                 while (!linedone) {
126                         switch (ch = getc(p)) {
127                         case EOF:
128                                 linedone = done = 1;
129                                 ch = '\n';
130                                 break;
131
132                         case '\f':
133                                 lineno = length;
134                         case '\n':
135                                 if (maxrep < 0)
136                                         maxrep = 0;
137                                 linedone = 1;
138                                 break;
139
140                         case '\b':
141                                 if (--col < indent)
142                                         col = indent;
143                                 break;
144
145                         case '\r':
146                                 col = indent;
147                                 break;
148
149                         case '\t':
150                                 col = ((col - indent) | 07) + indent + 1;
151                                 break;
152
153                         case '\031':
154                                 /*
155                                  * lpd needs to use a different filter to
156                                  * print data so stop what we are doing and
157                                  * wait for lpd to restart us.
158                                  */
159                                 if ((ch = getchar()) == '\1') {
160                                         fflush(stdout);
161                                         kill(getpid(), SIGSTOP);
162                                         break;
163                                 } else {
164                                         ungetc(ch, stdin);
165                                         ch = '\031';
166                                 }
167
168                         default:
169                                 if (col >= width || (!literal && ch < ' ')) {
170                                         col++;
171                                         break;
172                                 }
173                                 cp = &buf[0][col];
174                                 for (i = 0; i < MAXREP; i++) {
175                                         if (i > maxrep)
176                                                 maxrep = i;
177                                         if (*cp == ' ') {
178                                                 *cp = ch;
179                                                 if (col > maxcol[i])
180                                                         maxcol[i] = col;
181                                                 break;
182                                         }
183                                         cp += MAXWIDTH;
184                                 }
185                                 col++;
186                                 break;
187                         }
188                 }
189
190                 /* print out lines */
191                 for (i = 0; i <= maxrep; i++) {
192                         for (cp = buf[i], limit = cp+maxcol[i]; cp <= limit;) {
193                                 putc(*cp, o);
194                                 *cp++ = ' ';
195                         }
196                         if (i < maxrep)
197                                 putc('\r', o);
198                         else
199                                 putc(ch, o);
200                         if (++lineno >= length) {
201                                 fflush(o);
202                                 npages++;
203                                 lineno = 0;
204                         }
205                         maxcol[i] = -1;
206                 }
207         }
208         if (lineno) {           /* be sure to end on a page boundary */
209                 putchar('\f');
210                 npages++;
211         }
212         if (name && acctfile && access(acctfile, 02) >= 0 &&
213             freopen(acctfile, "a", stdout) != NULL) {
214                 printf("%7.2f\t%s:%s\n", (float)npages, host, name);
215         }
216         exit(0);
217 }