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54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
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* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: fpurge.c,v 1.20 2001/09/11 04:04:48 gshapiro Exp $")
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#include <stdlib.h>
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#include <errno.h>
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#include <sm/io.h>
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#include <sm/assert.h>
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#include "local.h"
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/*
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** SM_IO_PURGE -- purge/empty the buffer without committing buffer content
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**
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** Parameters:
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** fp -- file pointer to purge
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**
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** Returns:
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** Failure: returns SM_IO_EOF and sets errno
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** Success: returns 0 (zero)
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*/
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int
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sm_io_purge(fp)
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register SM_FILE_T *fp;
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{
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SM_REQUIRE_ISA(fp, SmFileMagic);
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if (!fp->f_flags)
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{
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errno = EBADF;
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return SM_IO_EOF;
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}
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if (HASUB(fp))
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FREEUB(fp);
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fp->f_p = fp->f_bf.smb_base;
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fp->f_r = 0;
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/* implies SMFBF */
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fp->f_w = fp->f_flags & (SMLBF|SMNBF) ? 0 : fp->f_bf.smb_size;
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return 0;
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}
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