usr/src/lib/libc/port/stdio/setbuffer.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 (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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * Compatibility wrappers for setbuffer and setlinebuf
  31  */
  32
  33 #include "lint.h"
  34 #include <sys/types.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37
  38 /*
  39  * Associate a buffer with an "unused" stream.
  40  * If the buffer is NULL, then make the stream completely unbuffered.
  41  */
  42 void
  43 setbuffer(FILE *iop, char *abuf, size_t asize)
  44 {
  45         if (abuf == NULL)
  46                 (void) setvbuf(iop, NULL, _IONBF, 0);
  47         else
  48                 (void) setvbuf(iop, abuf, _IOFBF, asize);
  49 }
  50
  51 /*
  52  * Convert a block buffered or line buffered stream to be line buffered
  53  * Allowed while the stream is still active; relies on the implementation
  54  * not the interface!
  55  */
  56
  57 int
  58 setlinebuf(FILE *iop)
  59 {
  60         (void) fflush(iop);
  61         (void) setvbuf(iop, NULL, _IOLBF, 128);
  62         return (0);
  63 }