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#include <stdio.h>
#include "_stdio.h"
#include "_forced/write.h"
/** flush buffered writes **/
int fflush(FILE *stream)
{
int ret = 0;
SIGNAL_SAFE(0);
if (stream == NULL) {
size_t i;
for (i = 0; i < FOPEN_MAX; i++) {
stream = __stdio.FILES + i;
if (stream->write && (stream->operation != OP_INPUT)) {
fflush(stream);
}
}
return 0;
}
ASSERT_STREAM(stream, 0, 0);
if (!stream->write) {
UNDEFINED("attempt to fflush() an input stream");
}
if (stream->read && stream->operation == OP_INPUT) {
UNDEFINED("attempt to fflush() an update stream after input");
}
if (stream->bpos == 0) {
return 0;
}
flockfile(stream);
if (write(stream->fd, stream->buf, stream->bpos) < 0) {
/* errno is set */
ret = EOF;
stream->err = 1;
} else {
stream->bpos = 0;
}
funlockfile(stream);
/*
RETURN_SUCCESS(0);
RETURN_FAILURE(CONSTANT(EOF));
*/
stream->operation = OP_NONE;
return ret;
}
/***
function flushes any buffered write operations on ARGUMENT(stream) to
the underlying file.
If ARGUMENT(stream) is CONSTANT(NULL), THIS() will flush all open streams.
***/
/*
UNDEFINED(ARGUMENT(stream) is not an output stream)
UNDEFINED(ARGUMENT(stream) is an update stream in which the most recent operation was input)
STDC(1)
*/
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