1 /* $OpenBSD: foldit.c,v 1.2 1996/06/26 05:42:37 deraadt 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 static char rcsid[] = "$OpenBSD: foldit.c,v 1.2 1996/06/26 05:42:37 deraadt Exp $"; 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 46 int 47 foldit(chunk, col, max) 48 char *chunk; 49 int col, max; 50 { 51 register char *cp; 52 53 /* 54 * Keep track of column position. Insert hidden newline 55 * if this chunk puts us over the limit. 56 */ 57 again: 58 cp = chunk; 59 while (*cp) { 60 switch(*cp) { 61 case '\n': 62 case '\r': 63 col = 0; 64 break; 65 case '\t': 66 col = col + 8 &~ 07; 67 break; 68 case '\b': 69 col = col ? col - 1 : 0; 70 break; 71 default: 72 col++; 73 } 74 if (col > (max - 2)) { 75 printf("\\\n"); 76 col = 0; 77 goto again; 78 } 79 cp++; 80 } 81 return (col); 82 } 83