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Import tmux, a terminal multiplexor allowing (among other things) a single
terminal to be switched between several different windows and programs
displayed on one terminal be detached from one terminal and moved to another.

ok deraadt pirofti

/* $OpenBSD: util.c,v 1.1 2009/06/01 22:58:49 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include "tmux.h"

/* Return a section of a string around a point. */
char *
section_string(char *buf, size_t len, size_t sectoff, size_t sectlen)
{
	char	*s;
	size_t	 first, last;

	if (len <= sectlen) {
		first = 0;
		last = len;
	} else if (sectoff < sectlen / 2) {
		first = 0;
		last = sectlen;
	} else if (sectoff + sectlen / 2 > len) {
		last = len;
		first = last - sectlen;
	} else {
		first = sectoff - sectlen / 2;
		last = first + sectlen;
	}

	if (last - first > 3 && first != 0)
		first += 3;
	if (last - first > 3 && last != len)
		last -= 3;

	xasprintf(&s, "%s%.*s%s", first == 0 ? "" : "...",
	    (int) (last - first), buf + first, last == len ? "" : "...");
	return (s);
}

/* Clean string of invisible characters. */
void
clean_string(const char *in, char *buf, size_t len)
{
	const u_char	*cp;
	size_t	 	 off;

	off = 0;
	for (cp = in; *cp != '\0'; cp++) {
		if (off >= len)
			break;
		if (*cp >= 0x20 && *cp <= 0x7f)
			buf[off++] = *cp;
		else
			off += xsnprintf(buf + off, len - off, "\\%03hho", *cp);
	}
	if (off < len)
		buf[off] = '\0';
}