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