diff options
Diffstat (limited to 'libc/stdio/fpurge.c')
-rw-r--r-- | libc/stdio/fpurge.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/libc/stdio/fpurge.c b/libc/stdio/fpurge.c new file mode 100644 index 0000000..fa0213a --- /dev/null +++ b/libc/stdio/fpurge.c @@ -0,0 +1,58 @@ +/* $OpenBSD: fpurge.c,v 1.6 2005/08/08 08:05:36 espie Exp $ */ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include "local.h" + +/* + * fpurge: like fflush, but without writing anything: leave the + * given FILE's buffer empty. + */ +int +fpurge(FILE *fp) +{ + if (!fp->_flags) { + errno = EBADF; + return(EOF); + } + + if (HASUB(fp)) + FREEUB(fp); + WCIO_FREE(fp); + fp->_p = fp->_bf._base; + fp->_r = 0; + fp->_w = fp->_flags & (__SLBF|__SNBF) ? 0 : fp->_bf._size; + return (0); +} |