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[FreeBSD/releng/9.2.git] / 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  * 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 #include <string.h>
59
60 #define MAXWIDTH  132
61 #define MAXREP    10
62
63 char    buf[MAXREP][MAXWIDTH];
64 int     maxcol[MAXREP] = {-1};
65 int     lineno;
66 int     width = 132;    /* default line length */
67 int     length = 66;    /* page length */
68 int     indent;         /* indentation length */
69 int     npages = 1;
70 int     literal;        /* print control characters */
71 char    *name;          /* user's login name */
72 char    *host;          /* user's machine name */
73 char    *acctfile;      /* accounting information file */
74
75 int
76 main(int argc, char *argv[])
77 {
78         register FILE *p = stdin, *o = stdout;
79         register int i, col;
80         register char *cp;
81         int done, linedone, maxrep;
82         char *limit;
83         int ch;
84
85         while (--argc) {
86                 if (*(cp = *++argv) == '-') {
87                         switch (cp[1]) {
88                         case 'n':
89                                 argc--;
90                                 name = *++argv;
91                                 break;
92
93                         case 'h':
94                                 argc--;
95                                 host = *++argv;
96                                 break;
97
98                         case 'w':
99                                 if ((i = atoi(&cp[2])) > 0 && i <= MAXWIDTH)
100                                         width = i;
101                                 break;
102
103                         case 'l':
104                                 length = atoi(&cp[2]);
105                                 break;
106
107                         case 'i':
108                                 indent = atoi(&cp[2]);
109                                 break;
110
111                         case 'c':       /* Print control chars */
112                                 literal++;
113                                 break;
114                         }
115                 } else
116                         acctfile = cp;
117         }
118
119         memset(buf, ' ', sizeof(buf));
120         done = 0;
121
122         while (!done) {
123                 col = indent;
124                 maxrep = -1;
125                 linedone = 0;
126                 while (!linedone) {
127                         switch (ch = getc(p)) {
128                         case EOF:
129                                 linedone = done = 1;
130                                 ch = '\n';
131                                 break;
132
133                         case '\f':
134                                 lineno = length;
135                         case '\n':
136                                 if (maxrep < 0)
137                                         maxrep = 0;
138                                 linedone = 1;
139                                 break;
140
141                         case '\b':
142                                 if (--col < indent)
143                                         col = indent;
144                                 break;
145
146                         case '\r':
147                                 col = indent;
148                                 break;
149
150                         case '\t':
151                                 col = ((col - indent) | 07) + indent + 1;
152                                 break;
153
154                         case '\031':
155                                 /*
156                                  * lpd needs to use a different filter to
157                                  * print data so stop what we are doing and
158                                  * wait for lpd to restart us.
159                                  */
160                                 if ((ch = getchar()) == '\1') {
161                                         fflush(stdout);
162                                         kill(getpid(), SIGSTOP);
163                                         break;
164                                 } else {
165                                         ungetc(ch, stdin);
166                                         ch = '\031';
167                                 }
168
169                         default:
170                                 if (col >= width || (!literal && ch < ' ')) {
171                                         col++;
172                                         break;
173                                 }
174                                 cp = &buf[0][col];
175                                 for (i = 0; i < MAXREP; i++) {
176                                         if (i > maxrep)
177                                                 maxrep = i;
178                                         if (*cp == ' ') {
179                                                 *cp = ch;
180                                                 if (col > maxcol[i])
181                                                         maxcol[i] = col;
182                                                 break;
183                                         }
184                                         cp += MAXWIDTH;
185                                 }
186                                 col++;
187                                 break;
188                         }
189                 }
190
191                 /* print out lines */
192                 for (i = 0; i <= maxrep; i++) {
193                         for (cp = buf[i], limit = cp+maxcol[i]; cp <= limit;) {
194                                 putc(*cp, o);
195                                 *cp++ = ' ';
196                         }
197                         if (i < maxrep)
198                                 putc('\r', o);
199                         else
200                                 putc(ch, o);
201                         if (++lineno >= length) {
202                                 fflush(o);
203                                 npages++;
204                                 lineno = 0;
205                         }
206                         maxcol[i] = -1;
207                 }
208         }
209         if (lineno) {           /* be sure to end on a page boundary */
210                 putchar('\f');
211                 npages++;
212         }
213         if (name && acctfile && access(acctfile, 02) >= 0 &&
214             freopen(acctfile, "a", stdout) != NULL) {
215                 printf("%7.2f\t%s:%s\n", (float)npages, host, name);
216         }
217         exit(0);
218 }