minix/lib/stdio/fflush.c

87 lines
1.8 KiB
C
Raw Normal View History

2005-04-21 16:53:53 +02:00
/*
* fflush.c - flush stream(s)
*/
/* $Header$ */
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
2005-04-21 16:53:53 +02:00
#include "loc_incl.h"
ssize_t _write(int d, const char *buf, size_t nbytes);
off_t _lseek(int fildes, off_t offset, int whence);
int
fflush(FILE *stream)
{
int count, c1, i, retval = 0;
if (!stream) {
for(i= 0; i < FOPEN_MAX; i++)
if (__iotab[i] && fflush(__iotab[i]))
retval = EOF;
return retval;
}
if (!stream->_buf
|| (!io_testflag(stream, _IOREADING)
&& !io_testflag(stream, _IOWRITING)))
return 0;
if (io_testflag(stream, _IOREADING)) {
/* (void) fseek(stream, 0L, SEEK_CUR); */
int adjust = 0;
if (io_testflag(stream, _IOFIFO)) {
/* Can't seek in a pipe. */
return 0;
}
2005-04-21 16:53:53 +02:00
if (stream->_buf && !io_testflag(stream,_IONBF))
adjust = -stream->_count;
stream->_count = 0;
if (_lseek(fileno(stream), (off_t) adjust, SEEK_CUR) == -1 &&
errno != ESPIPE) {
2005-04-21 16:53:53 +02:00
stream->_flags |= _IOERR;
return EOF;
}
errno = 0;
2005-04-21 16:53:53 +02:00
if (io_testflag(stream, _IOWRITE))
stream->_flags &= ~(_IOREADING | _IOWRITING);
stream->_ptr = stream->_buf;
return 0;
} else if (io_testflag(stream, _IONBF)) return 0;
if (io_testflag(stream, _IOREAD)) /* "a" or "+" mode */
stream->_flags &= ~_IOWRITING;
count = stream->_ptr - stream->_buf;
stream->_ptr = stream->_buf;
if ( count <= 0 )
return 0;
if (io_testflag(stream, _IOAPPEND)) {
if (_lseek(fileno(stream), 0L, SEEK_END) == -1) {
stream->_flags |= _IOERR;
return EOF;
}
}
c1 = _write(stream->_fd, (char *)stream->_buf, count);
stream->_count = 0;
if ( count == c1 )
return 0;
stream->_flags |= _IOERR;
return EOF;
}
void
__cleanup(void)
{
register int i;
for(i= 0; i < FOPEN_MAX; i++)
if (__iotab[i] && io_testflag(__iotab[i], _IOWRITING))
(void) fflush(__iotab[i]);
}