lib/sh/setlinebuf.c

   1 /* setlinebuf.c - line-buffer a stdio stream. */
   2
   3 /* Copyright (C) 1997 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <config.h>
  22
  23 #include <stdio.h>
  24
  25 #include <xmalloc.h>
  26
  27 #if defined (USING_BASH_MALLOC)
  28 #  define LBUF_BUFSIZE  1008
  29 #else
  30 #  define LBUF_BUFSIZE  BUFSIZ
  31 #endif
  32
  33 /* Cause STREAM to buffer lines as opposed to characters or blocks. */
  34 int
  35 sh_setlinebuf (stream)
  36      FILE *stream;
  37 {
  38   char *local_linebuf;
  39
  40 #if !defined (HAVE_SETLINEBUF) && !defined (HAVE_SETVBUF)
  41   return (0);
  42 #endif
  43
  44 #if defined (USING_BASH_MALLOC)
  45   local_linebuf = (char *)xmalloc (LBUF_BUFSIZE);
  46 #else
  47   local_linebuf = (char *)NULL;
  48 #endif
  49
  50 #if defined (HAVE_SETVBUF)
  51
  52 #  if defined (SETVBUF_REVERSED)
  53   return (setvbuf (stream, _IOLBF, local_linebuf, LBUF_BUFSIZE));
  54 #  else /* !SETVBUF_REVERSED */
  55   return (setvbuf (stream, local_linebuf, _IOLBF, LBUF_BUFSIZE));
  56 #  endif /* !SETVBUF_REVERSED */
  57 # else /* !HAVE_SETVBUF */
  58
  59   setlinebuf (stream);
  60   return (0);
  61
  62 #endif /* !HAVE_SETVBUF */
  63 }