78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* $NetBSD: foldit.c,v 1.7 2009/02/10 23:06:31 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: foldit.c,v 1.7 2009/02/10 23:06:31 christos Exp $");
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#endif /* not lint */
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#include <stdio.h>
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#include <vis.h>
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#include "extern.h"
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int
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foldit(const char *chunk, int col, int max, int flags)
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{
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const char *cp;
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/*
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* Keep track of column position. Insert hidden newline
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* if this chunk puts us over the limit.
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*/
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again:
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cp = chunk;
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while (*cp) {
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switch(*cp) {
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case '\n':
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case '\r':
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col = 0;
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break;
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case '\t':
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col = (col + 8) &~ 07;
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break;
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case '\b':
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col = col ? col - 1 : 0;
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break;
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default:
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col++;
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}
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if (col > (max - 2)) {
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printf(flags & VIS_MIMESTYLE ? "=\n" : "\\\n");
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col = 0;
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goto again;
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}
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cp++;
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}
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return (col);
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}
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