1 /* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
3 * GNU Library General Public License (LGPL) version 2 or later.
5 * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
14 size_t fread_unlocked(void * __restrict ptr
, size_t size
, size_t nmemb
,
15 FILE * __restrict stream
)
17 __STDIO_STREAM_VALIDATE(stream
);
18 assert(stream
->__filedes
>= -1);
20 /* Note: If nmbem * size > SIZE_MAX then there is an application
21 * bug since no array can be larger than SIZE_MAX in size. */
23 if ((__STDIO_STREAM_IS_NARROW_READING(stream
)
24 || !__STDIO_STREAM_TRANS_TO_READ(stream
, __FLAG_NARROW
))
28 if (nmemb
<= (SIZE_MAX
/ size
)) {
29 unsigned char *buffer
= (unsigned char *) ptr
;
30 size_t todo
, bytes
, avail
;
32 todo
= bytes
= size
* nmemb
;
34 /* Check for ungots... */
35 while (stream
->__modeflags
& __FLAG_UNGOT
) {
36 *buffer
++ = stream
->__ungot
[(stream
->__modeflags
--) & 1];
37 stream
->__ungot
[1] = 0;
43 #ifdef __STDIO_BUFFERS
44 /* Next check for available buffered... */
45 if ((avail
= stream
->__bufread
- stream
->__bufpos
) > 0) {
49 memcpy(buffer
, stream
->__bufpos
, avail
);
51 stream
->__bufpos
+= avail
;
52 if (!(todo
-= avail
)) {
57 /* We need to read from the host environment, so we must
58 * flush all line buffered streams if the stream is not
60 if (!__STDIO_STREAM_IS_FBF(stream
)) {
61 __STDIO_FLUSH_LBF_STREAMS
;
65 #ifdef __UCLIBC_MJN3_ONLY__
66 #warning CONSIDER: should we refill and read from the buffer sometimes?
68 while ((avail
= __stdio_READ(stream
, buffer
, todo
)) > 0) {
70 if (!(todo
-= avail
)) {
76 __STDIO_STREAM_VALIDATE(stream
);
77 return (bytes
- todo
) / size
;
80 __STDIO_STREAM_SET_ERROR(stream
);
84 __STDIO_STREAM_VALIDATE(stream
);
87 libc_hidden_def(fread_unlocked
)
89 #ifndef __UCLIBC_HAS_THREADS__
90 strong_alias(fread_unlocked
,fread
)
91 libc_hidden_def(fread
)
94 #elif defined __UCLIBC_HAS_THREADS__
96 size_t fread(void * __restrict ptr
, size_t size
, size_t nmemb
,
97 register FILE * __restrict stream
)
100 __STDIO_AUTO_THREADLOCK_VAR
;
102 __STDIO_AUTO_THREADLOCK(stream
);
104 retval
= fread_unlocked(ptr
, size
, nmemb
, stream
);
106 __STDIO_AUTO_THREADUNLOCK(stream
);
110 libc_hidden_def(fread
)