xref: /src/sys/lib/libsa/gets.c

/*	$NetBSD: gets.c,v 1.15 2019/03/31 20:08:45 christos Exp $	*/

/*-
 * Copyright (c) 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.
 *
 *	@(#)gets.c	8.1 (Berkeley) 6/11/93
 */

#include "stand.h"

#if 0 /* harmful */
void
gets(char *buf)
{
	kgets(buf, (size_t)-1);
}
#endif

void
kgets(char *buf, size_t size)
{
	int c;
	char *lp;

	for (lp = buf;;) {
		if ((size_t)(lp - buf) == size) {
			lp--;
			*lp = '\0';
			return;
		}
		switch (c = getchar() & 0177) {
		case '\n':
		case '\r':
			*lp = '\0';
			putchar('\n');
			return;
		case '\b':
		case '\177':
			if (lp > buf) {
				lp--;
				putchar('\b');
				putchar(' ');
				putchar('\b');
			}
			break;
#if HASH_ERASE
		case '#':
			if (lp > buf)
				--lp;
			break;
#endif
		case 'r' & 037: {
			char *p;

			putchar('\n');
			for (p = buf; p < lp; ++p)
				putchar(*p);
			break;
		}
#if AT_ERASE
		case '@':
#endif
		case 'u' & 037:
		case 'w' & 037:
			lp = buf;
			putchar('\n');
			break;
		default:
			*lp++ = c;
			putchar(c);
			break;
		}
	}
	/*NOTREACHED*/
}