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/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
*
* GNU Library General Public License (LGPL) version 2 or later.
*
* Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
*/
#include "_stdio.h"
#ifdef __DO_UNLOCKED
size_t fread_unlocked(void * __restrict ptr, size_t size, size_t nmemb,
FILE * __restrict stream)
{
__STDIO_STREAM_VALIDATE(stream);
assert(stream->__filedes >= -1);
/* Note: If nmbem * size > SIZE_MAX then there is an application
* bug since no array can be larger than SIZE_MAX in size. */
if ((__STDIO_STREAM_IS_NARROW_READING(stream)
|| !__STDIO_STREAM_TRANS_TO_READ(stream, __FLAG_NARROW))
&& size && nmemb
) {
if (nmemb <= (SIZE_MAX / size)) {
unsigned char *buffer = (unsigned char *) ptr;
size_t todo, bytes, avail;
todo = bytes = size * nmemb;
/* Check for ungots... */
while (stream->__modeflags & __FLAG_UNGOT) {
*buffer++ = stream->__ungot[(stream->__modeflags--) & 1];
stream->__ungot[1] = 0;
if (!--todo) {
goto DONE;
}
}
#ifdef __STDIO_BUFFERS
/* Next check for available buffered... */
if ((avail = stream->__bufread - stream->__bufpos) > 0) {
if (avail > todo) {
avail = todo;
}
memcpy(buffer, stream->__bufpos, avail);
buffer += avail;
stream->__bufpos += avail;
if (!(todo -= avail)) {
goto DONE;
}
}
/* We need to read from the host environment, so we must
* flush all line buffered streams if the stream is not
* fully buffered. */
if (!__STDIO_STREAM_IS_FBF(stream)) {
__STDIO_FLUSH_LBF_STREAMS;
}
#endif
#ifdef __UCLIBC_MJN3_ONLY__
#warning CONSIDER: should we refill and read from the buffer sometimes?
#endif
while ((avail = __stdio_READ(stream, buffer, todo)) > 0) {
buffer += avail;
if (!(todo -= avail)) {
break;
}
}
DONE:
__STDIO_STREAM_VALIDATE(stream);
return (bytes - todo) / size;
}
__STDIO_STREAM_SET_ERROR(stream);
__set_errno(EINVAL);
}
__STDIO_STREAM_VALIDATE(stream);
return 0;
}
libc_hidden_def(fread_unlocked)
#ifndef __UCLIBC_HAS_THREADS__
strong_alias(fread_unlocked,fread)
libc_hidden_def(fread)
#endif
#elif defined __UCLIBC_HAS_THREADS__
size_t fread(void * __restrict ptr, size_t size, size_t nmemb,
register FILE * __restrict stream)
{
size_t retval;
__STDIO_AUTO_THREADLOCK_VAR;
__STDIO_AUTO_THREADLOCK(stream);
retval = fread_unlocked(ptr, size, nmemb, stream);
__STDIO_AUTO_THREADUNLOCK(stream);
return retval;
}
libc_hidden_def(fread)
#endif
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