1 /* 2 * Copyright (c) 2000-2001 Sendmail, 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> 16 SM_RCSID("@(#)$Id: fpurge.c,v 1.18 2001/01/28 00:29:35 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 34 int 35 sm_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