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/* setlinebuf.c - line-buffer a stdio stream. */
/* Copyright (C) 1997,2022 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <xmalloc.h>
#if defined (USING_BASH_MALLOC)
# define LBUF_BUFSIZE 2016
#else
# define LBUF_BUFSIZE BUFSIZ
#endif
static char *stdoutbuf = 0;
static char *stderrbuf = 0;
/* Cause STREAM to buffer lines as opposed to characters or blocks. */
int
sh_setlinebuf (stream)
FILE *stream;
{
#if !defined (HAVE_SETLINEBUF) && !defined (HAVE_SETVBUF)
return (0);
#endif
#if defined (HAVE_SETVBUF)
char *local_linebuf;
#if defined (USING_BASH_MALLOC)
if (stream == stdout && stdoutbuf == 0)
local_linebuf = stdoutbuf = (char *)xmalloc (LBUF_BUFSIZE);
else if (stream == stderr && stderrbuf == 0)
local_linebuf = stderrbuf = (char *)xmalloc (LBUF_BUFSIZE);
else
local_linebuf = (char *)NULL; /* let stdio handle it */
#else
local_linebuf = (char *)NULL;
#endif
return (setvbuf (stream, local_linebuf, _IOLBF, LBUF_BUFSIZE));
#else /* !HAVE_SETVBUF */
setlinebuf (stream);
return (0);
#endif /* !HAVE_SETVBUF */
}
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