119914Swollman/* $NetBSD: foldit.c,v 1.7 2009/02/10 23:06:31 christos Exp $ */ 250476Speter 31558Srgrimes/*- 4156905Sru * Copyright (c) 1990, 1993 5156905Sru * The Regents of the University of California. All rights reserved. 61558Srgrimes * 725451Speter * Redistribution and use in source and binary forms, with or without 8138593Ssam * modification, are permitted provided that the following conditions 925451Speter * are met: 10138593Ssam * 1. Redistributions of source code must retain the above copyright 11138593Ssam * notice, this list of conditions and the following disclaimer. 12138593Ssam * 2. Redistributions in binary form must reproduce the above copyright 13138593Ssam * notice, this list of conditions and the following disclaimer in the 14138593Ssam * documentation and/or other materials provided with the distribution. 15138593Ssam * 3. Neither the name of the University nor the names of its contributors 16138593Ssam * may be used to endorse or promote products derived from this software 17138593Ssam * without specific prior written permission. 18138593Ssam * 19138593Ssam * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20138593Ssam * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2144764Swpaul * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22138593Ssam * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23138593Ssam * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24138593Ssam * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25138593Ssam * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26181224Sthompsa * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27193664Shrs * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2877217Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29178354Ssam * SUCH DAMAGE. 30178354Ssam */ 31178354Ssam 32178354Ssam#include <sys/cdefs.h> 33142215Sglebius#ifndef lint 34159781Smlaier#if 0 35142215Sglebiusstatic char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93"; 36142215Sglebius#endif 37146987Sthompsa__RCSID("$NetBSD: foldit.c,v 1.7 2009/02/10 23:06:31 christos Exp $"); 38168793Sthompsa#endif /* not lint */ 39146987Sthompsa 40156905Sru#include <stdio.h> 41138593Ssam#include <vis.h> 42178354Ssam#include "extern.h" 43178354Ssam 4480057Sobrienint 4580057Sobrienfoldit(const char *chunk, int col, int max, int flags) 46138593Ssam{ 47138593Ssam const char *cp; 48144130Sbrooks 49126178Sjohan /* 501558Srgrimes * Keep track of column position. Insert hidden newline 511558Srgrimes * if this chunk puts us over the limit. 52 */ 53again: 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(flags & VIS_MIMESTYLE ? "=\n" : "\\\n"); 72 col = 0; 73 goto again; 74 } 75 cp++; 76 } 77 return (col); 78} 79