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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #include "lint.h"
31 #include "file64.h"
32 #include "mtlib.h"
33 #include <sys/types.h>
34 #include <stdio.h>
35 #include <memory.h>
36 #include <thread.h>
37 #include <synch.h>
38 #include <errno.h>
39 #include "stdiom.h"
40 #include "mse.h"
41
42 /* read a single line from stdin, replace the '\n' with '\0' */
43 char *
gets(char * buf)44 gets(char *buf)
45 {
46 char *ptr = buf;
47 ssize_t n;
48 char *p;
49 Uchar *bufend;
50 rmutex_t *lk;
51
52 FLOCKFILE(lk, stdin);
53
54 _SET_ORIENTATION_BYTE(stdin);
55
56 if (!(stdin->_flag & (_IOREAD | _IORW))) {
57 errno = EBADF;
58 FUNLOCKFILE(lk);
59 return (0);
60 }
61
62 if (stdin->_base == NULL) {
63 if ((bufend = _findbuf(stdin)) == 0) {
64 FUNLOCKFILE(lk);
65 return (0);
66 }
67 }
68 else
69 bufend = _bufend(stdin);
70
71 for (;;) /* until get a '\n' */
72 {
73 if (stdin->_cnt <= 0) /* empty buffer */
74 {
75 if (__filbuf(stdin) != EOF) {
76 stdin->_ptr--; /* put back the character */
77 stdin->_cnt++;
78 } else if (ptr == buf) { /* never read anything */
79 FUNLOCKFILE(lk);
80 return (0);
81 } else
82 break; /* nothing left to read */
83 }
84 n = stdin->_cnt;
85 if ((p = (char *)memccpy(ptr, (char *)stdin->_ptr, '\n',
86 (size_t)n)) != 0)
87 n = p - ptr;
88 ptr += n;
89 stdin->_cnt -= n;
90 stdin->_ptr += n;
91 if (_needsync(stdin, bufend))
92 _bufsync(stdin, bufend);
93 if (p != 0) /* found a '\n' */
94 {
95 ptr--; /* step back over the '\n' */
96 break;
97 }
98 }
99 *ptr = '\0';
100 FUNLOCKFILE(lk);
101 return (buf);
102 }
103