1*bb0dd614Schristos /* $NetBSD: foldit.c,v 1.7 2009/02/10 23:06:31 christos Exp $ */
29afe744eSjtc
361f28255Scgd /*-
49afe744eSjtc * Copyright (c) 1990, 1993
59afe744eSjtc * The Regents of the University of California. All rights reserved.
661f28255Scgd *
761f28255Scgd * Redistribution and use in source and binary forms, with or without
861f28255Scgd * modification, are permitted provided that the following conditions
961f28255Scgd * are met:
1061f28255Scgd * 1. Redistributions of source code must retain the above copyright
1161f28255Scgd * notice, this list of conditions and the following disclaimer.
1261f28255Scgd * 2. Redistributions in binary form must reproduce the above copyright
1361f28255Scgd * notice, this list of conditions and the following disclaimer in the
1461f28255Scgd * documentation and/or other materials provided with the distribution.
1589aaa1bbSagc * 3. Neither the name of the University nor the names of its contributors
1661f28255Scgd * may be used to endorse or promote products derived from this software
1761f28255Scgd * without specific prior written permission.
1861f28255Scgd *
1961f28255Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2061f28255Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2161f28255Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2261f28255Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2361f28255Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2461f28255Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2561f28255Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2661f28255Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2761f28255Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2861f28255Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2961f28255Scgd * SUCH DAMAGE.
3061f28255Scgd */
3161f28255Scgd
323ad51f34Slukem #include <sys/cdefs.h>
3361f28255Scgd #ifndef lint
349afe744eSjtc #if 0
359afe744eSjtc static char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93";
369afe744eSjtc #endif
37*bb0dd614Schristos __RCSID("$NetBSD: foldit.c,v 1.7 2009/02/10 23:06:31 christos Exp $");
3861f28255Scgd #endif /* not lint */
3961f28255Scgd
404915ed99Sjtc #include <stdio.h>
41*bb0dd614Schristos #include <vis.h>
42*bb0dd614Schristos #include "extern.h"
433ad51f34Slukem
444915ed99Sjtc int
foldit(const char * chunk,int col,int max,int flags)45*bb0dd614Schristos foldit(const char *chunk, int col, int max, int flags)
4661f28255Scgd {
47*bb0dd614Schristos const char *cp;
4861f28255Scgd
4961f28255Scgd /*
5061f28255Scgd * Keep track of column position. Insert hidden newline
5161f28255Scgd * if this chunk puts us over the limit.
5261f28255Scgd */
5361f28255Scgd again:
5461f28255Scgd cp = chunk;
5561f28255Scgd while (*cp) {
5661f28255Scgd switch(*cp) {
5761f28255Scgd case '\n':
5861f28255Scgd case '\r':
5961f28255Scgd col = 0;
6061f28255Scgd break;
6161f28255Scgd case '\t':
623ad51f34Slukem col = (col + 8) &~ 07;
6361f28255Scgd break;
6461f28255Scgd case '\b':
6561f28255Scgd col = col ? col - 1 : 0;
6661f28255Scgd break;
6761f28255Scgd default:
6861f28255Scgd col++;
6961f28255Scgd }
7061f28255Scgd if (col > (max - 2)) {
71*bb0dd614Schristos printf(flags & VIS_MIMESTYLE ? "=\n" : "\\\n");
7261f28255Scgd col = 0;
7361f28255Scgd goto again;
7461f28255Scgd }
7561f28255Scgd cp++;
7661f28255Scgd }
7761f28255Scgd return (col);
7861f28255Scgd }
79