1 /*- 2 * Copyright (c) 1990, 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 * 3. 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 * @(#)foldit.c 8.1 (Berkeley) 6/6/93 30 * $FreeBSD: src/usr.bin/vis/foldit.c,v 1.4 1999/08/28 01:07:25 peter Exp $ 31 * $DragonFly: src/usr.bin/vis/foldit.c,v 1.4 2008/10/16 01:52:34 swildner Exp $ 32 */ 33 34 #include <stdio.h> 35 36 int 37 foldit(char *chunk, int col, int max) 38 { 39 char *cp; 40 41 /* 42 * Keep track of column position. Insert hidden newline 43 * if this chunk puts us over the limit. 44 */ 45 again: 46 cp = chunk; 47 while (*cp) { 48 switch(*cp) { 49 case '\n': 50 case '\r': 51 col = 0; 52 break; 53 case '\t': 54 col = col + 8 &~ 07; 55 break; 56 case '\b': 57 col = col ? col - 1 : 0; 58 break; 59 default: 60 col++; 61 } 62 if (col > (max - 2)) { 63 printf("\\\n"); 64 col = 0; 65 goto again; 66 } 67 cp++; 68 } 69 return (col); 70 } 71