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 2009 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30/*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40/*LINTLIBRARY*/
41
42#include <sys/types.h>
43#include "file64.h"
44#include <stdio.h>
45#include <sys/fcntl.h>
46#include <unistd.h>
47#include <sys/file.h>
48#include "stdiom.h"
49
50/* Final argument to _endopen depends on build environment */
51#define	ALWAYS_LARGE_OPEN	1
52#define	LARGE_OPEN	(_FILE_OFFSET_BITS == 64)
53
54static FILE *
55_endopen(const char *file, const char *mode, FILE *iop, int largefile)
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
76	if (largefile) {
77		fd = open64(file, oflag, 0666);	/* mapped to open() for V9 */
78	} else {
79		fd = open(file, oflag, 0666);
80	}
81	if (fd < 0)
82		return (NULL);
83	iop->_cnt = 0;
84#ifdef _LP64
85	iop->_file = fd;
86#else
87	if (fd <= _FILE_FD_MAX) {
88		SET_FILE(iop, fd);
89	} else if (_file_set(iop, fd, mode) != 0) {
90		/* errno set in _file_set() */
91		(void) close(fd);
92		return (NULL);
93	}
94#endif
95	iop->_flag = plus ? _IORW : (mode[0] == 'r') ? _IOREAD : _IOWRT;
96	if (mode[0] == 'a')   {
97		if ((lseek64(fd, 0L, SEEK_END)) < 0)  {
98			(void) close(fd);
99			return (NULL);
100		}
101	}
102	iop->_base = iop->_ptr = NULL;
103	/*
104	 * Sys5 does not support _bufsiz
105	 *
106	 * iop->_bufsiz = 0;
107	 */
108	return (iop);
109}
110
111FILE *
112fopen(const char *file, const char *mode)
113{
114	FILE	*iop;
115	FILE	*rc;
116
117	iop = _findiop();
118	rc = _endopen(file, mode, iop, LARGE_OPEN);
119	if (rc == NULL && iop != NULL)
120		iop->_flag = 0;	/* release iop */
121	return (rc);
122}
123
124/*
125 * For _LP64, all fopen() calls are 64-bit calls, i.e., open64() system call.
126 * There should not be fopen64() calls.
127 * Similar for freopen64().
128 */
129#if !defined(_LP64)
130FILE *
131fopen64(const char *file, const char *mode)
132{
133	FILE	*iop;
134	FILE	*rc;
135
136	iop = _findiop();
137	rc = _endopen(file, mode, iop, ALWAYS_LARGE_OPEN);
138	if (rc == NULL && iop != NULL)
139		iop->_flag = 0;	/* release iop */
140	return (rc);
141}
142#endif
143
144FILE *
145freopen(const char *file, const char *mode, FILE *iop)
146{
147	(void) fclose(iop); /* doesn't matter if this fails */
148	return (_endopen(file, mode, iop, LARGE_OPEN));
149}
150
151#if !defined(_LP64)
152FILE *
153freopen64(const char *file, const char *mode, FILE *iop)
154{
155	(void) fclose(iop); /* doesn't matter if this fails */
156	return (_endopen(file, mode, iop, ALWAYS_LARGE_OPEN));
157}
158#endif
159