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 /*
23 * Copyright 1986 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 /*LINTLIBRARY*/
33 #include <stdio.h>
34 #include <fcntl.h>
35
36 extern int fclose();
37 extern FILE *_findiop();
38
39 static FILE *_endopen(char *, char *, FILE *);
40
41 FILE *
fopen(char * file,char * mode)42 fopen(char *file, char *mode)
43 {
44 return (_endopen(file, mode, _findiop()));
45 }
46
47 FILE *
freopen(char * file,char * mode,FILE * iop)48 freopen(char *file, char *mode, FILE *iop)
49 {
50 (void) fclose(iop); /* doesn't matter if this fails */
51 return (_endopen(file, mode, iop));
52 }
53
54 static FILE *
_endopen(char * file,char * mode,FILE * iop)55 _endopen(char *file, char *mode, FILE *iop)
56 {
57 int plus, oflag, fd;
58
59 if (iop == NULL || file == NULL || file[0] == '\0')
60 return (NULL);
61 plus = (mode[1] == '+');
62 switch (mode[0]) {
63 case 'w':
64 oflag = (plus ? O_RDWR : O_WRONLY) | O_TRUNC | O_CREAT;
65 break;
66 case 'a':
67 oflag = (plus ? O_RDWR : O_WRONLY) | O_CREAT;
68 break;
69 case 'r':
70 oflag = plus ? O_RDWR : O_RDONLY;
71 break;
72 default:
73 return (NULL);
74 }
75 if ((fd = open(file, oflag, 0666)) < 0)
76 return (NULL);
77 iop->_cnt = 0;
78 iop->_file = fd;
79 iop->_flag = plus ? _IORW : (mode[0] == 'r') ? _IOREAD : _IOWRT;
80 if (mode[0] == 'a') {
81 if ((lseek(fd,0L,2)) < 0) {
82 (void) close(fd);
83 return NULL;
84 }
85 }
86 iop->_base = iop->_ptr = NULL;
87 iop->_bufsiz = 0;
88 return (iop);
89 }
90