Annotation of src/usr.bin/vis/foldit.c, Revision 1.5
1.5 ! deraadt 1: /* $OpenBSD: foldit.c,v 1.4 2003/06/03 02:56:22 millert Exp $ */
1.1 deraadt 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.
1.4 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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: #include <stdio.h>
34:
35: int
36: foldit(chunk, col, max)
37: char *chunk;
38: int col, max;
39: {
1.3 mpech 40: char *cp;
1.1 deraadt 41:
42: /*
43: * Keep track of column position. Insert hidden newline
44: * if this chunk puts us over the limit.
45: */
46: again:
47: cp = chunk;
48: while (*cp) {
49: switch(*cp) {
50: case '\n':
51: case '\r':
52: col = 0;
53: break;
54: case '\t':
55: col = col + 8 &~ 07;
56: break;
57: case '\b':
58: col = col ? col - 1 : 0;
59: break;
60: default:
61: col++;
62: }
63: if (col > (max - 2)) {
64: printf("\\\n");
65: col = 0;
66: goto again;
67: }
68: cp++;
69: }
70: return (col);
71: }