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-rw-r--r--foldit.c78
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+/* $NetBSD: foldit.c,v 1.7 2009/02/10 23:06:31 christos Exp $ */
+
+/*-
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93";
+#endif
+__RCSID("$NetBSD: foldit.c,v 1.7 2009/02/10 23:06:31 christos Exp $");
+#endif /* not lint */
+
+#include <stdio.h>
+#include <vis.h>
+#include "extern.h"
+
+int
+foldit(const char *chunk, int col, int max, int flags)
+{
+ const char *cp;
+
+ /*
+ * Keep track of column position. Insert hidden newline
+ * if this chunk puts us over the limit.
+ */
+again:
+ cp = chunk;
+ while (*cp) {
+ switch(*cp) {
+ case '\n':
+ case '\r':
+ col = 0;
+ break;
+ case '\t':
+ col = (col + 8) &~ 07;
+ break;
+ case '\b':
+ col = col ? col - 1 : 0;
+ break;
+ default:
+ col++;
+ }
+ if (col > (max - 2)) {
+ printf(flags & VIS_MIMESTYLE ? "=\n" : "\\\n");
+ col = 0;
+ goto again;
+ }
+ cp++;
+ }
+ return (col);
+}