1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. 3*7c478bd9Sstevel@tonic-gate * All rights reserved. 4*7c478bd9Sstevel@tonic-gate * Copyright (c) 1990, 1993 5*7c478bd9Sstevel@tonic-gate * The Regents of the University of California. All rights reserved. 6*7c478bd9Sstevel@tonic-gate * 7*7c478bd9Sstevel@tonic-gate * This code is derived from software contributed to Berkeley by 8*7c478bd9Sstevel@tonic-gate * Chris Torek. 9*7c478bd9Sstevel@tonic-gate * 10*7c478bd9Sstevel@tonic-gate * By using this file, you agree to the terms and conditions set 11*7c478bd9Sstevel@tonic-gate * forth in the LICENSE file which can be found at the top level of 12*7c478bd9Sstevel@tonic-gate * the sendmail distribution. 13*7c478bd9Sstevel@tonic-gate */ 14*7c478bd9Sstevel@tonic-gate 15*7c478bd9Sstevel@tonic-gate #include <sm/gen.h> 16*7c478bd9Sstevel@tonic-gate SM_RCSID("@(#)$Id: fpurge.c,v 1.18 2001/01/28 00:29:35 ca Exp $") 17*7c478bd9Sstevel@tonic-gate #include <stdlib.h> 18*7c478bd9Sstevel@tonic-gate #include <errno.h> 19*7c478bd9Sstevel@tonic-gate #include <sm/io.h> 20*7c478bd9Sstevel@tonic-gate #include <sm/assert.h> 21*7c478bd9Sstevel@tonic-gate #include "local.h" 22*7c478bd9Sstevel@tonic-gate 23*7c478bd9Sstevel@tonic-gate /* 24*7c478bd9Sstevel@tonic-gate ** SM_IO_PURGE -- purge/empty the buffer without committing buffer content 25*7c478bd9Sstevel@tonic-gate ** 26*7c478bd9Sstevel@tonic-gate ** Parameters: 27*7c478bd9Sstevel@tonic-gate ** fp -- file pointer to purge 28*7c478bd9Sstevel@tonic-gate ** 29*7c478bd9Sstevel@tonic-gate ** Returns: 30*7c478bd9Sstevel@tonic-gate ** Failure: returns SM_IO_EOF and sets errno 31*7c478bd9Sstevel@tonic-gate ** Success: returns 0 (zero) 32*7c478bd9Sstevel@tonic-gate */ 33*7c478bd9Sstevel@tonic-gate 34*7c478bd9Sstevel@tonic-gate int 35*7c478bd9Sstevel@tonic-gate sm_io_purge(fp) 36*7c478bd9Sstevel@tonic-gate register SM_FILE_T *fp; 37*7c478bd9Sstevel@tonic-gate { 38*7c478bd9Sstevel@tonic-gate SM_REQUIRE_ISA(fp, SmFileMagic); 39*7c478bd9Sstevel@tonic-gate if (!fp->f_flags) 40*7c478bd9Sstevel@tonic-gate { 41*7c478bd9Sstevel@tonic-gate errno = EBADF; 42*7c478bd9Sstevel@tonic-gate return SM_IO_EOF; 43*7c478bd9Sstevel@tonic-gate } 44*7c478bd9Sstevel@tonic-gate 45*7c478bd9Sstevel@tonic-gate if (HASUB(fp)) 46*7c478bd9Sstevel@tonic-gate FREEUB(fp); 47*7c478bd9Sstevel@tonic-gate fp->f_p = fp->f_bf.smb_base; 48*7c478bd9Sstevel@tonic-gate fp->f_r = 0; 49*7c478bd9Sstevel@tonic-gate 50*7c478bd9Sstevel@tonic-gate /* implies SMFBF */ 51*7c478bd9Sstevel@tonic-gate fp->f_w = fp->f_flags & (SMLBF|SMNBF) ? 0 : fp->f_bf.smb_size; 52*7c478bd9Sstevel@tonic-gate return 0; 53*7c478bd9Sstevel@tonic-gate } 54