1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
|
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* No user fns here. Pesch 15apr92. */
#include <_ansi.h>
#include <reent.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/lock.h>
#include "local.h"
#ifdef _REENT_SMALL
const struct __sFILE_fake __sf_fake_stdin =
{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
const struct __sFILE_fake __sf_fake_stdout =
{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
const struct __sFILE_fake __sf_fake_stderr =
{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
#endif
#ifdef _REENT_GLOBAL_STDIO_STREAMS
__FILE __sf[3];
#endif
#if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED))
_NOINLINE_STATIC void
#else
static void
#endif
std (FILE *ptr,
int flags,
int file)
{
ptr->_p = 0;
ptr->_r = 0;
ptr->_w = 0;
ptr->_flags = flags;
ptr->_flags2 = 0;
ptr->_file = file;
ptr->_bf._base = 0;
ptr->_bf._size = 0;
ptr->_lbfsize = 0;
memset (&ptr->_mbstate, 0, sizeof (_mbstate_t));
ptr->_cookie = ptr;
ptr->_read = __sread;
#ifndef __LARGE64_FILES
ptr->_write = __swrite;
#else /* __LARGE64_FILES */
ptr->_write = __swrite64;
ptr->_seek64 = __sseek64;
ptr->_flags |= __SL64;
#endif /* __LARGE64_FILES */
ptr->_seek = __sseek;
#ifdef _STDIO_CLOSE_PER_REENT_STD_STREAMS
ptr->_close = __sclose;
#else /* _STDIO_CLOSE_STD_STREAMS */
ptr->_close = NULL;
#endif /* _STDIO_CLOSE_STD_STREAMS */
#if !defined(__SINGLE_THREAD__) && !defined(_REENT_SMALL)
__lock_init_recursive (ptr->_lock);
/*
* #else
* lock is already initialized in __sfp
*/
#endif
#ifdef __SCLE
if (__stextmode (ptr->_file))
ptr->_flags |= __SCLE;
#endif
}
static inline void
stdin_init(FILE *ptr)
{
std (ptr, __SRD, 0);
}
static inline void
stdout_init(FILE *ptr)
{
/* On platforms that have true file system I/O, we can verify
whether stdout is an interactive terminal or not, as part of
__smakebuf on first use of the stream. For all other platforms,
we will default to line buffered mode here. Technically, POSIX
requires both stdin and stdout to be line-buffered, but tradition
leaves stdin alone on systems without fcntl. */
#ifdef HAVE_FCNTL
std (ptr, __SWR, 1);
#else
std (ptr, __SWR | __SLBF, 1);
#endif
}
static inline void
stderr_init(FILE *ptr)
{
/* POSIX requires stderr to be opened for reading and writing, even
when the underlying fd 2 is write-only. */
std (ptr, __SRW | __SNBF, 2);
}
struct glue_with_file {
struct _glue glue;
FILE file;
};
struct _glue *
__sfmoreglue (struct _reent *d,
register int n)
{
struct glue_with_file *g;
g = (struct glue_with_file *)
_malloc_r (d, sizeof (*g) + (n - 1) * sizeof (FILE));
if (g == NULL)
return NULL;
g->glue._next = NULL;
g->glue._niobs = n;
g->glue._iobs = &g->file;
memset (&g->file, 0, n * sizeof (FILE));
return &g->glue;
}
/*
* Find a free FILE for fopen et al.
*/
FILE *
__sfp (struct _reent *d)
{
FILE *fp;
int n;
struct _glue *g;
_newlib_sfp_lock_start ();
if (!_GLOBAL_REENT->__sdidinit)
__sinit (_GLOBAL_REENT);
for (g = &_GLOBAL_REENT->__sglue;; g = g->_next)
{
for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++)
if (fp->_flags == 0)
goto found;
if (g->_next == NULL &&
(g->_next = __sfmoreglue (d, NDYNAMIC)) == NULL)
break;
}
_newlib_sfp_lock_exit ();
d->_errno = ENOMEM;
return NULL;
found:
fp->_file = -1; /* no file */
fp->_flags = 1; /* reserve this slot; caller sets real flags */
fp->_flags2 = 0;
#ifndef __SINGLE_THREAD__
__lock_init_recursive (fp->_lock);
#endif
_newlib_sfp_lock_end ();
fp->_p = NULL; /* no current pointer */
fp->_w = 0; /* nothing to read or write */
fp->_r = 0;
fp->_bf._base = NULL; /* no buffer */
fp->_bf._size = 0;
fp->_lbfsize = 0; /* not line buffered */
memset (&fp->_mbstate, 0, sizeof (_mbstate_t));
/* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
fp->_ub._base = NULL; /* no ungetc buffer */
fp->_ub._size = 0;
fp->_lb._base = NULL; /* no line buffer */
fp->_lb._size = 0;
return fp;
}
/*
* exit() calls _cleanup() through *__cleanup, set whenever we
* open or buffer a file. This chicanery is done so that programs
* that do not use stdio need not link it all in.
*
* The name `_cleanup' is, alas, fairly well known outside stdio.
*/
void
_cleanup_r (struct _reent *ptr)
{
int (*cleanup_func) (struct _reent *, FILE *);
#ifdef _STDIO_BSD_SEMANTICS
/* BSD and Glibc systems only flush streams which have been written to
at exit time. Calling flush rather than close for speed, as on
the aforementioned systems. */
cleanup_func = __sflushw_r;
#else
/* Otherwise close files and flush read streams, too.
Note we call flush directly if "--enable-lite-exit" is in effect. */
#ifdef _LITE_EXIT
cleanup_func = _fflush_r;
#else
cleanup_func = _fclose_r;
#endif
#endif
#ifdef _REENT_GLOBAL_STDIO_STREAMS
if (ptr->_stdin != &__sf[0])
(*cleanup_func) (ptr, ptr->_stdin);
if (ptr->_stdout != &__sf[1])
(*cleanup_func) (ptr, ptr->_stdout);
if (ptr->_stderr != &__sf[2])
(*cleanup_func) (ptr, ptr->_stderr);
#endif
(void) _fwalk_reent (ptr, cleanup_func);
}
#ifndef _REENT_ONLY
void
_cleanup (void)
{
_cleanup_r (_GLOBAL_REENT);
}
#endif
/*
* __sinit() is called whenever stdio's internal variables must be set up.
*/
void
__sinit (struct _reent *s)
{
__sinit_lock_acquire ();
if (s->__sdidinit)
{
__sinit_lock_release ();
return;
}
/* make sure we clean up on exit */
s->__cleanup = _cleanup_r; /* conservative */
s->__sglue._next = NULL;
#ifndef _REENT_SMALL
# ifndef _REENT_GLOBAL_STDIO_STREAMS
s->__sglue._niobs = 3;
s->__sglue._iobs = &s->__sf[0];
# endif
#else
s->__sglue._niobs = 0;
s->__sglue._iobs = NULL;
/* Avoid infinite recursion when calling __sfp for _GLOBAL_REENT. The
problem is that __sfp checks for _GLOBAL_REENT->__sdidinit and calls
__sinit if it's 0. */
if (s == _GLOBAL_REENT)
s->__sdidinit = 1;
s->_stdin = __sfp(s);
s->_stdout = __sfp(s);
s->_stderr = __sfp(s);
#endif
#ifdef _REENT_GLOBAL_STDIO_STREAMS
if (__sf[0]._cookie == NULL) {
_GLOBAL_REENT->__sglue._niobs = 3;
_GLOBAL_REENT->__sglue._iobs = &__sf[0];
stdin_init (&__sf[0]);
stdout_init (&__sf[1]);
stderr_init (&__sf[2]);
}
#else
stdin_init (s->_stdin);
stdout_init (s->_stdout);
stderr_init (s->_stderr);
#endif
s->__sdidinit = 1;
__sinit_lock_release ();
}
#ifndef __SINGLE_THREAD__
__LOCK_INIT_RECURSIVE(static, __sfp_recursive_mutex);
__LOCK_INIT_RECURSIVE(static, __sinit_recursive_mutex);
void
__sfp_lock_acquire (void)
{
__lock_acquire_recursive (__sfp_recursive_mutex);
}
void
__sfp_lock_release (void)
{
__lock_release_recursive (__sfp_recursive_mutex);
}
void
__sinit_lock_acquire (void)
{
__lock_acquire_recursive (__sinit_recursive_mutex);
}
void
__sinit_lock_release (void)
{
__lock_release_recursive (__sinit_recursive_mutex);
}
/* Walkable file locking routine. */
static int
__fp_lock (FILE * ptr)
{
if (!(ptr->_flags2 & __SNLK))
_flockfile (ptr);
return 0;
}
/* Walkable file unlocking routine. */
static int
__fp_unlock (FILE * ptr)
{
if (!(ptr->_flags2 & __SNLK))
_funlockfile (ptr);
return 0;
}
void
__fp_lock_all (void)
{
__sfp_lock_acquire ();
(void) _fwalk (_REENT, __fp_lock);
}
void
__fp_unlock_all (void)
{
(void) _fwalk (_REENT, __fp_unlock);
__sfp_lock_release ();
}
#endif
|