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#include <__stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/cdefs.h>
#include <unistd.h>
int fflush_unlocked(struct __FILE *stream)
{
if (stream == NULL) {
// TODO: flush all streams
return 0;
}
if (__predict_false(stream->fd) == -1) {
stream->buf_len = 0;
return 0;
}
if (__predict_false(stream->buf == 0)) {
return 0;
}
if (stream->flags & _IO_ERR) {
errno = EIO;
return EOF;
}
if ((stream->flags & O_ACCMODE) == O_RDONLY) {
errno = EBADF;
return EOF;
}
size_t bytes_to_write = stream->buf_len;
size_t total_written = 0;
char *buf_ptr = stream->buf;
while (total_written < bytes_to_write) {
ssize_t result = write(stream->fd, buf_ptr + total_written, bytes_to_write - total_written);
if (result < 0) {
stream->flags |= _IO_ERR;
return EOF;
}
if (result == 0) {
break;
}
total_written += result;
}
if (total_written == bytes_to_write) {
stream->buf_len = 0;
stream->buf_pos = 0;
} else {
size_t remaining = bytes_to_write - total_written;
memmove(stream->buf, stream->buf + total_written, remaining);
stream->buf_len = remaining;
stream->buf_pos = 0;
}
return (total_written == bytes_to_write) ? 0 : EOF;
}
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