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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"
/* Given a reading stream without its end-of-file indicator set and
* with no buffered input or ungots, read at most 'bufsize' bytes
* into 'buf' (which may be the stream's __bufstart).
* If a read error occurs, set the stream's error indicator.
* If EOF is encountered, set the stream's end-of-file indicator.
*
* Returns the number of bytes read, even in EOF and error cases.
*
* Notes:
* Calling with bufsize == 0 is NOT permitted (unlike __stdio_WRITE).
* NOT THREADSAFE! Assumes stream already locked if necessary.
*/
size_t attribute_hidden __stdio_READ(register FILE *stream,
unsigned char *buf, size_t bufsize)
{
ssize_t rv = 0;
__STDIO_STREAM_VALIDATE(stream);
assert(stream->__filedes >= -2);
assert(__STDIO_STREAM_IS_READING(stream));
assert(!__STDIO_STREAM_BUFFER_RAVAIL(stream)); /* Buffer must be empty. */
assert(!(stream->__modeflags & __FLAG_UNGOT));
assert(bufsize);
if (!__FEOF_UNLOCKED(stream)) {
if (bufsize > SSIZE_MAX) {
bufsize = SSIZE_MAX;
}
#ifdef __UCLIBC_MJN3_ONLY__
#warning EINTR?
#endif
/* RETRY: */
if ((rv = __READ(stream, (char *) buf, bufsize)) <= 0) {
if (rv == 0) {
__STDIO_STREAM_SET_EOF(stream);
} else {
/* if (errno == EINTR) goto RETRY; */
__STDIO_STREAM_SET_ERROR(stream);
rv = 0;
}
#ifdef __UCLIBC_MJN3_ONLY__
#warning TODO: Make custom stream read return check optional.
#endif
#ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__
} else {
assert(rv <= bufsize);
if (rv > bufsize) { /* Read more than bufsize! */
abort();
}
#endif
}
}
return rv;
}
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