usr/src/lib/libast/common/stdio/setvbuf.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 #include "stdhdr.h"
  25
  26 int
  27 setvbuf(Sfio_t* f, char* buf, int type, size_t size)
  28 {
  29         STDIO_INT(f, "setvbuf", int, (Sfio_t*, char*, int, size_t), (f, buf, type, size))
  30
  31         if (type == _IOLBF)
  32                 sfset(f, SF_LINE, 1);
  33         else if (f->flags & SF_STRING)
  34                 return -1;
  35         else if (type == _IONBF)
  36         {
  37                 sfsync(f);
  38                 sfsetbuf(f, NiL, 0);
  39         }
  40         else if (type == _IOFBF)
  41         {
  42                 if (size == 0)
  43                         size = SF_BUFSIZE;
  44                 sfsync(f);
  45                 sfsetbuf(f, (Void_t*)buf, size);
  46         }
  47         return 0;
  48 }