banner.c revision 1.11 
1/*	$OpenBSD: banner.c,v 1.11 2015/10/09 01:37:06 deraadt Exp $	*/
2/*	$NetBSD: banner.c,v 1.2 1995/04/09 06:00:15 cgd Exp $	*/
3
4/*
5 *	Changes for banner(1)
6 *
7 *      @(#)Copyright (c) 1995, Simon J. Gerraty.
8 *
9 *      This is free software.  It comes with NO WARRANTY.
10 *      Permission to use, modify and distribute this source code
11 *      is granted subject to the following conditions.
12 *      1/ that the above copyright notice and this notice
13 *      are preserved in all copies and that due credit be given
14 *      to the author.
15 *      2/ that any changes to this code are clearly commented
16 *      as such so that the author does not get blamed for bugs
17 *      other than his own.
18 *
19 *      Please send copies of changes and bug-fixes to:
20 *      sjg@zen.void.oz.au
21 */
22
23/*
24 * Copyright (c) 1983, 1993
25 *	The Regents of the University of California.  All rights reserved.
26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the above copyright
31 *    notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 *    notice, this list of conditions and the following disclaimer in the
34 *    documentation and/or other materials provided with the distribution.
35 * 3. Neither the name of the University nor the names of its contributors
36 *    may be used to endorse or promote products derived from this software
37 *    without specific prior written permission.
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
40 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
42 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
45 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
47 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
48 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49 * SUCH DAMAGE.
50 */
51
52#include <stdio.h>
53#include <unistd.h>
54#include <stdlib.h>
55#include <string.h>
56#include <err.h>
57
58#include "banner.h"
59
60static long PW = LINELEN;
61
62/* the char gen code below is lifted from lpd */
63
64static char *
65scnline(int key, char *p, int c)
66{
67	int scnwidth;
68
69	/*
70	 * <sjg> lpd makes chars out of the letter in question.
71	 * the results are somewhat mixed.  Sticking to '#' as
72	 * banner(1) does is more consistent.
73	 */
74#ifndef NOHASH_ONLY
75	c = '#';
76#endif
77
78	for (scnwidth = WIDTH; --scnwidth;) {
79		key <<= 1;
80		*p++ = key & 0200 ? c : BACKGND;
81	}
82	return (p);
83}
84
85#define TRC(q)	(((q)-' ')&0177)
86
87
88static int
89dropit(int c)
90{
91	switch(c) {
92
93	case TRC('_'):
94	case TRC(';'):
95	case TRC(','):
96	case TRC('g'):
97	case TRC('j'):
98	case TRC('p'):
99	case TRC('q'):
100	case TRC('y'):
101		return (DROP);
102
103	default:
104		return (0);
105	}
106}
107
108static void
109scan_out(int scfd, char *scsp, int dlm)
110{
111	char *strp;
112	int nchrs, j;
113	char outbuf[LINELEN+1], *sp, c, cc;
114	int d, scnhgt;
115	extern char scnkey[][HEIGHT];	/* in lpdchar.c */
116
117	for (scnhgt = 0; scnhgt++ < HEIGHT+DROP; ) {
118		strp = &outbuf[0];
119		sp = scsp;
120		for (nchrs = 0; *sp != dlm && *sp != '\0'; ) {
121			cc = *sp++;
122			if ((unsigned char)cc < ' ' ||
123			    (unsigned char)cc > 0x7f)
124				cc = INVALID;
125
126			c = TRC(cc);
127			d = dropit(c);
128			if ((!d && scnhgt > HEIGHT) || (scnhgt <= DROP && d))
129				for (j = WIDTH; --j;)
130					*strp++ = BACKGND;
131			else
132				strp = scnline(scnkey[(int)c][scnhgt-1-d], strp, cc);
133			if (nchrs++ >= PW/(WIDTH+1)-1)
134				break;
135			*strp++ = BACKGND;
136#ifdef LPD_CHSET				/* <sjg> */
137			*strp++ = BACKGND;
138#endif
139		}
140		while (*--strp == BACKGND && strp >= outbuf)
141			;
142		strp++;
143		*strp++ = '\n';
144		(void) write(scfd, outbuf, strp-outbuf);
145	}
146}
147
148/*
149 * for each word, print up to 10 chars in big letters.
150 */
151int
152main(int argc, char *argv[])
153{
154	char word[10+1];			/* strings limited to 10 chars */
155
156	if (pledge("stdio", NULL) == -1)
157		err(1, "pledge");
158	while (*++argv) {
159		(void)strlcpy(word, *argv, sizeof (word));
160		scan_out(1, word, '\0');
161	}
162	exit(0);
163}
164