1 /** @file
2
3 Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
4 This program and the accompanying materials are licensed and made available under
5 the terms and conditions of the BSD License that accompanies this distribution.
6 The full text of the license may be found at
7 http://opensource.org/licenses/bsd-license.
8
9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11
12 * Copyright (c) 1990, 1993
13 * The Regents of the University of California. All rights reserved.
14 *
15 * This code is derived from software contributed to Berkeley by
16 * Chris Torek.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 3. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41
42 NetBSD: findfp.c,v 1.23 2006/10/07 21:40:46 thorpej Exp
43 findfp.c 8.2 (Berkeley) 1/4/94
44 **/
45 #include <LibConfig.h>
46 #include <sys/EfiCdefs.h>
47
48 #include "namespace.h"
49 #include <sys/param.h>
50 #include <stdio.h>
51 #include <errno.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55 #include "reentrant.h"
56 #include "local.h"
57 #include "glue.h"
58 #include <MainData.h>
59
60 int __sdidinit;
61
62 #define NDYNAMIC 10 /* add ten more whenever necessary */
63
64 #define std(flags, file) \
65 /* p r w flags file bf lfbsize cookie close */ \
66 { NULL, 0, 0, flags, file, { NULL, 0 }, 0, __sF + file, __sclose, \
67 /* read seek write ext up */ \
68 __sread, __sseek, __swrite, { (void *)(__sFext + file), 0 }, NULL, \
69 /* ur ubuf, nbuf lb blksize offset */ \
70 0, { '\0', '\0', '\0' }, { '\0' }, { NULL, 0 }, 0, (fpos_t)0 }
71
72 /* the usual - (stdin + stdout + stderr) */
73 static FILE usual[FOPEN_MAX - 3];
74 static struct __sfileext usualext[FOPEN_MAX - 3];
75 static struct glue uglue = { 0, FOPEN_MAX - 3, usual };
76
77 #if defined(_REENTRANT) && !defined(__lint__) /* XXX lint is busted */
78 #define STDEXT { ._lock = MUTEX_INITIALIZER, ._lockcond = COND_INITIALIZER }
79 struct __sfileext __sFext[3] = { STDEXT,
80 STDEXT,
81 STDEXT};
82 #else
83 struct __sfileext __sFext[3];
84 #endif
85
86 FILE __sF[3] = {
87 std(__SRD, STDIN_FILENO), /* stdin */
88 std(__SWR, STDOUT_FILENO), /* stdout */
89 std(__SWR|__SNBF, STDERR_FILENO) /* stderr */
90 };
91 struct glue __sglue = { &uglue, 3, __sF };
92
93 static struct glue *moreglue(int);
94 void f_prealloc(void);
95
96 #ifdef _REENTRANT
97 rwlock_t __sfp_lock = RWLOCK_INITIALIZER;
98 #endif
99
100 static struct glue *
moreglue(int n)101 moreglue(int n)
102 {
103 struct glue *g;
104 FILE *p;
105 struct __sfileext *pext;
106 static FILE empty;
107
108 g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE)
109 + n * sizeof(struct __sfileext));
110 if (g == NULL)
111 return (NULL);
112 p = (FILE *)ALIGN((g + 1));
113 g->next = NULL;
114 g->niobs = n;
115 g->iobs = p;
116 pext = (void *)(p + n);
117 while (--n >= 0) {
118 *p = empty;
119 _FILEEXT_SETUP(p, pext);
120 p++;
121 pext++;
122 }
123 return (g);
124 }
125
126 /*
127 * Find a free FILE for fopen et al.
128 */
129 FILE *
__sfp()130 __sfp()
131 {
132 FILE *fp;
133 int n;
134 struct glue *g;
135
136 if (!__sdidinit)
137 __sinit();
138
139 rwlock_wrlock(&__sfp_lock);
140 for (g = &__sglue;; g = g->next) {
141 for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
142 if (fp->_flags == 0)
143 goto found;
144 if (g->next == NULL && (g->next = moreglue(NDYNAMIC)) == NULL)
145 break;
146 }
147 rwlock_unlock(&__sfp_lock);
148 return (NULL);
149 found:
150 fp->_flags = 1; /* reserve this slot; caller sets real flags */
151 fp->_p = NULL; /* no current pointer */
152 fp->_w = 0; /* nothing to read or write */
153 fp->_r = 0;
154 fp->_bf._base = NULL; /* no buffer */
155 fp->_bf._size = 0;
156 fp->_lbfsize = 0; /* not line buffered */
157 fp->_file = -1; /* no file */
158 /* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
159 _UB(fp)._base = NULL; /* no ungetc buffer */
160 _UB(fp)._size = 0;
161 fp->_lb._base = NULL; /* no line buffer */
162 fp->_lb._size = 0;
163 memset(WCIO_GET(fp), 0, sizeof(struct wchar_io_data));
164 rwlock_unlock(&__sfp_lock);
165 return (fp);
166 }
167
168 #if 0
169 /*
170 * XXX. Force immediate allocation of internal memory. Not used by stdio,
171 * but documented historically for certain applications. Bad applications.
172 */
173 void
174 f_prealloc()
175 {
176 struct glue *g;
177 int n;
178
179 n = (int)sysconf(_SC_OPEN_MAX) - FOPEN_MAX + 20; /* 20 for slop. */
180 for (g = &__sglue; (n -= g->niobs) > 0 && g->next; g = g->next)
181 /* void */;
182 if (n > 0)
183 g->next = moreglue(n);
184 }
185 #endif
186
187 /*
188 * exit() calls _cleanup() through *gMD->cleanup, set whenever we
189 * open or buffer a file. This chicanery is done so that programs
190 * that do not use stdio need not link it all in.
191 *
192 * The name `_cleanup' is, alas, fairly well known outside stdio.
193 */
194 void
_cleanup(void)195 _cleanup( void )
196 {
197 /* (void) _fwalk(fclose); */
198 (void) fflush(NULL); /* `cheating' */
199 }
200
201 /*
202 * __sinit() is called whenever stdio's internal variables must be set up.
203 */
204 void
__sinit(void)205 __sinit( void )
206 {
207 int i;
208
209 for (i = 0; i < FOPEN_MAX - 3; i++)
210 _FILEEXT_SETUP(&usual[i], &usualext[i]);
211
212 /* make sure we clean up on exit */
213 gMD->cleanup = _cleanup; /* conservative */
214 __sdidinit = 1;
215 }
216