fpurge.c revision 182352
1249259Sdim/* 2249259Sdim * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. 3249259Sdim * All rights reserved. 4249259Sdim * Copyright (c) 1990, 1993 5249259Sdim * The Regents of the University of California. All rights reserved. 6249259Sdim * 7249259Sdim * This code is derived from software contributed to Berkeley by 8249259Sdim * Chris Torek. 9249259Sdim * 10249259Sdim * By using this file, you agree to the terms and conditions set 11249259Sdim * forth in the LICENSE file which can be found at the top level of 12249259Sdim * the sendmail distribution. 13249259Sdim */ 14249259Sdim 15249259Sdim#include <sm/gen.h> 16249259SdimSM_RCSID("@(#)$Id: fpurge.c,v 1.20 2001/09/11 04:04:48 gshapiro Exp $") 17276479Sdim#include <stdlib.h> 18276479Sdim#include <errno.h> 19249259Sdim#include <sm/io.h> 20249259Sdim#include <sm/assert.h> 21249259Sdim#include "local.h" 22249259Sdim 23249259Sdim/* 24249259Sdim** SM_IO_PURGE -- purge/empty the buffer without committing buffer content 25249259Sdim** 26249259Sdim** Parameters: 27249259Sdim** fp -- file pointer to purge 28249259Sdim** 29249259Sdim** Returns: 30249259Sdim** Failure: returns SM_IO_EOF and sets errno 31249259Sdim** Success: returns 0 (zero) 32249259Sdim*/ 33249259Sdim 34249259Sdimint 35249259Sdimsm_io_purge(fp) 36249259Sdim register SM_FILE_T *fp; 37249259Sdim{ 38249259Sdim SM_REQUIRE_ISA(fp, SmFileMagic); 39249259Sdim if (!fp->f_flags) 40249259Sdim { 41249259Sdim errno = EBADF; 42249259Sdim return SM_IO_EOF; 43249259Sdim } 44249259Sdim 45249259Sdim if (HASUB(fp)) 46249259Sdim FREEUB(fp); 47249259Sdim fp->f_p = fp->f_bf.smb_base; 48249259Sdim fp->f_r = 0; 49249259Sdim 50249259Sdim /* implies SMFBF */ 51249259Sdim fp->f_w = fp->f_flags & (SMLBF|SMNBF) ? 0 : fp->f_bf.smb_size; 52249259Sdim return 0; 53249259Sdim} 54249259Sdim