1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*      Copyright (c) 1984 AT&T */
23/*        All Rights Reserved   */
24
25#pragma ident	"%Z%%M%	%I%	%E% SMI"
26
27/*LINTLIBRARY*/
28/*
29 * This version reads directly from the buffer rather than looping on getc.
30 * Ptr args aren't checked for NULL because the program would be a
31 * catastrophic mess anyway.  Better to abort than just to return NULL.
32 */
33#include <stdio.h>
34#include "stdiom.h"
35#include <memory.h>
36
37extern int _filbuf();
38
39char *
40gets(char *ptr)
41{
42	char *p, *ptr0 = ptr;
43	int n;
44
45	for ( ; ; ) {
46		if (stdin->_cnt <= 0) { /* empty buffer */
47			if (_filbuf(stdin) == EOF) {
48				if (ptr0 == ptr)
49					return (NULL);
50				break; /* no more data */
51			}
52			stdin->_ptr--;
53			stdin->_cnt++;
54		}
55		n = stdin->_cnt;
56		if ((p = memccpy(ptr, (char *) stdin->_ptr, '\n', n)) != NULL)
57			n = p - ptr;
58		ptr += n;
59		stdin->_cnt -= n;
60		stdin->_ptr += n;
61		_BUFSYNC(stdin);
62		if (p != NULL) { /* found '\n' in buffer */
63			ptr--; /* step back over '\n' */
64			break;
65		}
66	}
67	*ptr = '\0';
68	return (ptr0);
69}
70