1 /* $OpenBSD: foldit.c,v 1.4 2003/06/03 02:56:22 millert Exp $ */
2 /* $NetBSD: foldit.c,v 1.4 1994/12/20 16:13:02 jtc Exp $ */
3
4 /*-
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93";
36 #endif
37 static char rcsid[] = "$OpenBSD: foldit.c,v 1.4 2003/06/03 02:56:22 millert Exp $";
38 #endif /* not lint */
39
40 #include <stdio.h>
41
42 int
foldit(chunk,col,max)43 foldit(chunk, col, max)
44 char *chunk;
45 int col, max;
46 {
47 char *cp;
48
49 /*
50 * Keep track of column position. Insert hidden newline
51 * if this chunk puts us over the limit.
52 */
53 again:
54 cp = chunk;
55 while (*cp) {
56 switch(*cp) {
57 case '\n':
58 case '\r':
59 col = 0;
60 break;
61 case '\t':
62 col = col + 8 &~ 07;
63 break;
64 case '\b':
65 col = col ? col - 1 : 0;
66 break;
67 default:
68 col++;
69 }
70 if (col > (max - 2)) {
71 printf("\\\n");
72 col = 0;
73 goto again;
74 }
75 cp++;
76 }
77 return (col);
78 }
79