TEST(stdio_ext, _flushlbf) {
FILE* fp = fopen("/dev/null", "w");
char buf[128];
ASSERT_EQ(0, setvbuf(fp, buf, _IOLBF, sizeof(buf)));
ASSERT_EQ('a', fputc('a', fp));
ASSERT_EQ(1U, __fpending(fp));
_flushlbf();
ASSERT_EQ(0U, __fpending(fp));
fclose(fp);
}
/* fill buffer, return first character or EOF */
int
_filbuf(FILE *iop)
{
ssize_t res;
size_t nbyte;
Uchar *endbuf;
#ifdef _LP64
unsigned int flag;
#else
unsigned char flag;
#endif
if (!(iop->_flag & _IOREAD)) /* check, correct permissions */
{
if (iop->_flag & _IORW)
iop->_flag |= _IOREAD; /* change direction */
/* to read - fseek */
else {
errno = EBADF;
return (EOF);
}
}
if (iop->_base == 0) {
if ((endbuf = _findbuf(iop)) == 0) /* get buffer and */
/* end_of_buffer */
return (EOF);
}
else
endbuf = _bufend(iop);
/*
* Flush all line-buffered streams before we
* read no-buffered or line-buffered input.
*/
if (iop->_flag & (_IONBF | _IOLBF))
_flushlbf();
/*
* Changed the get family fns in Solaris 10 to comply with the
* 1990 C Standard and standards based upon it. If the
* end-of-file indicator for the stream is set, or if the stream
* is at end-of-file, the function will return EOF, and the file
* position indicator for the stream will not be advanced.
* Additional bytes appended to the file do not clear the EOF
* indicator.
*/
if ((flag = iop->_flag) & _IOEOF) {
if (_xpg4_check()) {
/*
* A previous read() has returned 0 (below),
* therefore iop->_cnt was set to 0, and the EOF
* indicator was set before returning EOF. Reset
* iop->_cnt to 0; it has likely been changed by
* a function such as getc().
*/
iop->_cnt = 0;
return (EOF);
}
}
/*
* Fill buffer or read 1 byte for unbuffered, handling any errors.
*/
iop->_ptr = iop->_base;
if (flag & _IONBF)
nbyte = 1;
else
nbyte = endbuf - iop->_base;
if ((res = read(GET_FD(iop), (char *)iop->_base, nbyte)) > 0) {
iop->_cnt = res - 1;
return (*iop->_ptr++);
}
iop->_cnt = 0;
if (res == 0)
iop->_flag |= _IOEOF;
else if (!cancel_active())
iop->_flag |= _IOERR;
return (EOF);
}
