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 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