fpurge.c revision 261363
1/* 2 * Copyright (c) 2000-2001 Proofpoint, Inc. and its suppliers. 3 * All rights reserved. 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * By using this file, you agree to the terms and conditions set 11 * forth in the LICENSE file which can be found at the top level of 12 * the sendmail distribution. 13 */ 14 15#include <sm/gen.h> 16SM_RCSID("@(#)$Id: fpurge.c,v 1.21 2013/11/22 20:51:42 ca Exp $") 17#include <stdlib.h> 18#include <errno.h> 19#include <sm/io.h> 20#include <sm/assert.h> 21#include "local.h" 22 23/* 24** SM_IO_PURGE -- purge/empty the buffer without committing buffer content 25** 26** Parameters: 27** fp -- file pointer to purge 28** 29** Returns: 30** Failure: returns SM_IO_EOF and sets errno 31** Success: returns 0 (zero) 32*/ 33 34int 35sm_io_purge(fp) 36 register SM_FILE_T *fp; 37{ 38 SM_REQUIRE_ISA(fp, SmFileMagic); 39 if (!fp->f_flags) 40 { 41 errno = EBADF; 42 return SM_IO_EOF; 43 } 44 45 if (HASUB(fp)) 46 FREEUB(fp); 47 fp->f_p = fp->f_bf.smb_base; 48 fp->f_r = 0; 49 50 /* implies SMFBF */ 51 fp->f_w = fp->f_flags & (SMLBF|SMNBF) ? 0 : fp->f_bf.smb_size; 52 return 0; 53} 54