Boot loader fixes - fix recursive malloc()/free() errors, NULL freed fields
[dragonfly.git] / lib / libstand / open.c
CommitLineData
984263bc 1/* $FreeBSD: src/lib/libstand/open.c,v 1.2.6.1 2000/09/10 01:32:06 ps Exp $ */
1de703da 2/* $DragonFly: src/lib/libstand/open.c,v 1.2 2003/06/17 04:26:51 dillon Exp $ */
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3/* $NetBSD: open.c,v 1.16 1997/01/28 09:41:03 pk Exp $ */
4
5/*-
6 * Copyright (c) 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * The Mach Operating System project at Carnegie-Mellon University.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * @(#)open.c 8.1 (Berkeley) 6/11/93
41 *
42 *
43 * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
44 * All Rights Reserved.
45 *
46 * Author: Alessandro Forin
47 *
48 * Permission to use, copy, modify and distribute this software and its
49 * documentation is hereby granted, provided that both the copyright
50 * notice and this permission notice appear in all copies of the
51 * software, derivative works or modified versions, and any portions
52 * thereof, and that both notices appear in supporting documentation.
53 *
54 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
55 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
56 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
57 *
58 * Carnegie Mellon requests users of this software to return to
59 *
60 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
61 * School of Computer Science
62 * Carnegie Mellon University
63 * Pittsburgh PA 15213-3890
64 *
65 * any improvements or extensions that they make and grant Carnegie the
66 * rights to redistribute these changes.
67 */
68
69#include "stand.h"
70
71struct open_file files[SOPEN_MAX];
72
73static int
74o_gethandle(void)
75{
76 int fd;
77
78 for (fd = 0; fd < SOPEN_MAX; fd++)
79 if (files[fd].f_flags == 0)
80 return(fd);
81 return(-1);
82}
83
84static void
85o_rainit(struct open_file *f)
86{
87 f->f_rabuf = malloc(SOPEN_RASIZE);
88 f->f_ralen = 0;
89 f->f_raoffset = 0;
90}
91
92int
93open(const char *fname, int mode)
94{
95 struct open_file *f;
96 int fd, i, error, besterror;
97 const char *file;
98
99 if ((fd = o_gethandle()) == -1) {
100 errno = EMFILE;
101 return(-1);
102 }
103
104 f = &files[fd];
105 f->f_flags = mode + 1;
106 f->f_dev = (struct devsw *)0;
107 f->f_ops = (struct fs_ops *)0;
108 f->f_offset = 0;
109 f->f_devdata = NULL;
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110 f->f_fsdata = NULL;
111 file = NULL;
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112 error = devopen(f, fname, &file);
113 if (error ||
114 (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0))
115 goto err;
116
117 /* see if we opened a raw device; otherwise, 'file' is the file name. */
6825e71f 118 if (file == NULL || *file == '\0') {
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119 f->f_flags |= F_RAW;
120 return (fd);
121 }
122
123 /* pass file name to the different filesystem open routines */
124 besterror = ENOENT;
125 for (i = 0; file_system[i] != NULL; i++) {
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126 error = ((*file_system[i]).fo_open)(file, f);
127 if (error == 0) {
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128 f->f_ops = file_system[i];
129 o_rainit(f);
130 return (fd);
131 }
132 if (error != EINVAL)
133 besterror = error;
134 }
135 error = besterror;
136
137 if ((f->f_flags & F_NODEV) == 0)
138 f->f_dev->dv_close(f);
139 if (error)
140 devclose(f);
141
142 err:
143 f->f_flags = 0;
144 errno = error;
145 return (-1);
146}