fclose.c
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上传日期:2007-01-17
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文件大小:4k
- /* fclose.c - close file stdio.h */
- /* Copyright 1992-1993 Wind River Systems, Inc. */
- /*
- modification history
- --------------------
- 01d,05feb99,dgp document errno values
- 01c,05mar93,jdi documentation cleanup for 5.1.
- 01b,20sep92,smb documentation additions
- 01a,29jul92,jcf added OBJ_VERIFY and memory reclaimation.
- +smb taken from UCB stdio
- */
- /*
- DESCRIPTION
- *
- * Copyright (c) 1990 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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 FILE: stdio.h, stdlib.h, error.h
- SEE ALSO: American National Standard X3.159-1989
- NOMANUAL
- */
- #include "vxWorks.h"
- #include "stdio.h"
- #include "errno.h"
- #include "stdlib.h"
- #include "objLib.h"
- #include "private/stdioP.h"
- /******************************************************************************
- *
- * fclose - close a stream (ANSI)
- *
- * This routine flushes a specified stream and closes the associated file.
- * Any unwritten buffered data is delivered to the host environment to be
- * written to the file; any unread buffered data is discarded. The stream
- * is disassociated from the file. If the associated buffer was allocated
- * automatically, it is deallocated.
- *
- * INCLUDE FILES: stdio.h
- *
- * RETURNS:
- * Zero if the stream is closed successfully, or EOF if errors occur.
- *
- * ERRNO: EBADF
- *
- * SEE ALSO: fflush()
- */
- int fclose
- (
- FAST FILE * fp /* stream to close */
- )
- {
- FAST int r;
- if (OBJ_VERIFY (fp, fpClassId) != OK)
- return (EOF);
- if (fp->_flags == 0) /* not open! */
- {
- errno = EBADF;
- return (EOF);
- }
- r = (fp->_flags & __SWR) ? (__sflush(fp)) : (0);
- if (__sclose (fp) < 0)
- r = EOF;
- if (fp->_flags & __SMBF)
- free ((char *)fp->_bf._base);
- if (HASUB(fp)) /* ungetc buffer? */
- FREEUB(fp);
- if (HASLB(fp)) /* fgetline buffer? */
- FREELB(fp);
- fp->_flags = 0; /* release this FILE for reuse */
- stdioFpDestroy (fp); /* destroy the file pointer */
- return (r);
- }