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 <stdio.h>
34 #include <memory.h>
35 #include <errno.h>
36 #include <thread.h>
37 #include <synch.h>
38 #include <sys/types.h>
39 #include "stdiom.h"
40 #include "mse.h"
41
42 /* read size-max line from stream, including '\n' */
43 char *
fgets(char * buf,int size,FILE * iop)44 fgets(char *buf, int size, FILE *iop)
45 {
46 char *ptr = buf;
47 int n;
48 Uchar *bufend;
49 char *p;
50 rmutex_t *lk;
51
52 FLOCKFILE(lk, iop);
53
54 _SET_ORIENTATION_BYTE(iop);
55
56 if (!(iop->_flag & (_IOREAD | _IORW))) {
57 errno = EBADF;
58 FUNLOCKFILE(lk);
59 return (NULL);
60 }
61
62 if (iop->_base == NULL) {
63 if ((bufend = _findbuf(iop)) == NULL) {
64 FUNLOCKFILE(lk);
65 return (NULL);
66 }
67 }
68 else
69 bufend = _bufend(iop);
70
71 size--; /* room for '\0' */
72 while (size > 0) {
73 /* empty buffer */
74 if (iop->_cnt <= 0) {
75 if (__filbuf(iop) != EOF) {
76 iop->_ptr--; /* put back the character */
77 iop->_cnt++;
78 } else if (ptr == buf) { /* never read anything */
79 FUNLOCKFILE(lk);
80 return (NULL);
81 } else
82 break; /* nothing left to read */
83 }
84 n = (int)(size < iop->_cnt ? size : iop->_cnt);
85 if ((p = memccpy(ptr, (char *)iop->_ptr, '\n',
86 (size_t)n)) != NULL)
87 n = (int)(p - ptr);
88 ptr += n;
89 iop->_cnt -= n;
90 iop->_ptr += n;
91 if (_needsync(iop, bufend))
92 _bufsync(iop, bufend);
93 if (p != NULL)
94 break; /* newline found */
95 size -= n;
96 }
97 FUNLOCKFILE(lk);
98 *ptr = '\0';
99 return (buf);
100 }
101