1 /* $NetBSD: foldit.c,v 1.5 1997/10/20 03:06:47 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 __RCSID("$NetBSD: foldit.c,v 1.5 1997/10/20 03:06:47 lukem Exp $"); 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 46 int foldit __P((char *, int, int)); 47 48 int 49 foldit(chunk, col, max) 50 char *chunk; 51 int col, max; 52 { 53 char *cp; 54 55 /* 56 * Keep track of column position. Insert hidden newline 57 * if this chunk puts us over the limit. 58 */ 59 again: 60 cp = chunk; 61 while (*cp) { 62 switch(*cp) { 63 case '\n': 64 case '\r': 65 col = 0; 66 break; 67 case '\t': 68 col = (col + 8) &~ 07; 69 break; 70 case '\b': 71 col = col ? col - 1 : 0; 72 break; 73 default: 74 col++; 75 } 76 if (col > (max - 2)) { 77 printf("\\\n"); 78 col = 0; 79 goto again; 80 } 81 cp++; 82 } 83 return (col); 84 } 85