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      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 (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #pragma weak __flsbuf = _flsbuf
     33 
     34 #include "lint.h"
     35 #include "file64.h"
     36 #include <mtlib.h>
     37 #include <stdio.h>
     38 #include <thread.h>
     39 #include <synch.h>
     40 #include <unistd.h>
     41 #include <sys/types.h>
     42 #include "stdiom.h"
     43 
     44 int
     45 _flsbuf(int ch, FILE *iop)	/* flush (write) buffer, save ch, */
     46 				/* return EOF on failure */
     47 {
     48 	Uchar uch;
     49 
     50 	do	/* only loop if need to use _wrtchk() on non-_IOFBF */
     51 	{
     52 		switch (iop->_flag & (_IOFBF | _IOLBF | _IONBF |
     53 				_IOWRT | _IOEOF))
     54 		{
     55 		case _IOFBF | _IOWRT:	/* okay to do full-buffered case */
     56 			if (iop->_base != 0 && iop->_ptr > iop->_base)
     57 				goto flush_putc;	/* skip _wrtchk() */
     58 			break;
     59 		case _IOLBF | _IOWRT:	/* okay to do line-buffered case */
     60 			if (iop->_ptr >= _bufend(iop))
     61 				/*
     62 				 * which will recursively call
     63 				 * __flsbuf via putc because of no room
     64 				 * in the buffer for the character
     65 				 */
     66 				goto flush_putc;
     67 			if ((*iop->_ptr++ = (unsigned char)ch) == '\n')
     68 				(void) _xflsbuf(iop);
     69 			iop->_cnt = 0;
     70 			goto out;
     71 		case _IONBF | _IOWRT:	/* okay to do no-buffered case */
     72 			iop->_cnt = 0;
     73 			uch = (unsigned char)ch;
     74 			if (write(GET_FD(iop), (char *)&uch, 1) != 1) {
     75 				if (!cancel_active())
     76 					iop->_flag |= _IOERR;
     77 				return (EOF);
     78 			}
     79 			goto out;
     80 		}
     81 		if (_wrtchk(iop) != 0)	/* check, correct permissions */
     82 			return (EOF);
     83 	} while (iop->_flag & (_IOLBF | _IONBF));
     84 flush_putc:
     85 	(void) _xflsbuf(iop);
     86 	(void) PUTC(ch, iop); /*  recursive call */
     87 out:
     88 	/* necessary for putc() */
     89 	return ((iop->_flag & _IOERR) ? EOF : (unsigned char)ch);
     90 }
     91