tputs.c

早期freebsd实现

/*
 * Copyright (c) 1980, 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
static char sccsid[] = "@(#)tputs.c	8.1 (Berkeley) 6/4/93";
#endif /* not lint */

#include <sgtty.h>
#include <ctype.h>

/*
 * The following array gives the number of tens of milliseconds per
 * character for each speed as returned by gtty.  Thus since 300
 * baud returns a 7, there are 33.3 milliseconds per char at 300 baud.
 */
static
short	tmspc10[] = {
	0, 2000, 1333, 909, 743, 666, 500, 333, 166, 83, 55, 41, 20, 10, 5
};

short	ospeed;
char	PC;

/*
 * Put the character string cp out, with padding.
 * The number of affected lines is affcnt, and the routine
 * used to output one character is outc.
 */
tputs(cp, affcnt, outc)
	register char *cp;
	int affcnt;
	int (*outc)();
{
	register int i = 0;
	register int mspc10;

	if (cp == 0)
		return;

	/*
	 * Convert the number representing the delay.
	 */
	if (isdigit(*cp)) {
		do
			i = i * 10 + *cp++ - '0';
		while (isdigit(*cp));
	}
	i *= 10;
	if (*cp == '.') {
		cp++;
		if (isdigit(*cp))
			i += *cp - '0';
		/*
		 * Only one digit to the right of the decimal point.
		 */
		while (isdigit(*cp))
			cp++;
	}

	/*
	 * If the delay is followed by a `*', then
	 * multiply by the affected lines count.
	 */
	if (*cp == '*')
		cp++, i *= affcnt;

	/*
	 * The guts of the string.
	 */
	while (*cp)
		(*outc)(*cp++);

	/*
	 * If no delay needed, or output speed is
	 * not comprehensible, then don't try to delay.
	 */
	if (i == 0)
		return;
	if (ospeed <= 0 || ospeed >= (sizeof tmspc10 / sizeof tmspc10[0]))
		return;

	/*
	 * Round up by a half a character frame,
	 * and then do the delay.
	 * Too bad there are no user program accessible programmed delays.
	 * Transmitting pad characters slows many
	 * terminals down and also loads the system.
	 */
	mspc10 = tmspc10[ospeed];
	i += mspc10 / 2;
	for (i /= mspc10; i > 0; i--)
		(*outc)(PC);
}