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)