usr/src/lib/libbc/libc/stdio/sys5/vfprintf.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*LINTLIBRARY*/
  33 #include <stdio.h>
  34 #include <stdarg.h>
  35
  36 extern int _doprnt();
  37
  38 int
  39 vfprintf(FILE *iop, char *format, va_list ap)
  40 {
  41         unsigned char localbuf[BUFSIZ];
  42         int count;
  43
  44         if (!(iop->_flag & _IOWRT)) {
  45                 /* if no write flag */
  46                 if (iop->_flag & _IORW) {
  47                         /* if ok, cause read-write */
  48                         iop->_flag |= _IOWRT;
  49                 } else {
  50                         /* else error */
  51                         return (EOF);
  52                 }
  53         }
  54         if (iop->_flag & _IONBF) {
  55                 iop->_flag &= ~_IONBF;
  56                 iop->_ptr = iop->_base = localbuf;
  57                 iop->_bufsiz = BUFSIZ;
  58                 count = _doprnt(format, ap, iop);
  59                 fflush(iop);
  60                 iop->_flag |= _IONBF;
  61                 iop->_base = NULL;
  62                 iop->_bufsiz = 0;
  63                 iop->_cnt = 0;
  64         } else {
  65                 count = _doprnt(format, ap, iop);
  66         }
  67         return (ferror(iop)? EOF: count);
  68 }