mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-09 04:36:31 +00:00
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
static const char *
|
|
stream_name(FILE *s)
|
|
{
|
|
|
|
if (s == stdin)
|
|
return "stdin";
|
|
if (s == stdout)
|
|
return "stdout";
|
|
if (s == stderr)
|
|
return "stderr";
|
|
/* This should not happen. */
|
|
abort();
|
|
}
|
|
|
|
static void
|
|
change_buf(FILE *s, const char *bufmode)
|
|
{
|
|
char *unit;
|
|
size_t bufsize;
|
|
int mode;
|
|
|
|
bufsize = 0;
|
|
if (bufmode[0] == '0' && bufmode[1] == '\0')
|
|
mode = _IONBF;
|
|
else if (bufmode[0] == 'L' && bufmode[1] == '\0')
|
|
mode = _IOLBF;
|
|
else if (bufmode[0] == 'B' && bufmode[1] == '\0') {
|
|
mode = _IOFBF;
|
|
bufsize = 0;
|
|
} else {
|
|
/*
|
|
* This library being preloaded, depending on libutil
|
|
* would lead to excessive namespace pollution.
|
|
* Thus we do not use expand_number().
|
|
*/
|
|
errno = 0;
|
|
bufsize = strtol(bufmode, &unit, 0);
|
|
if (errno == EINVAL || errno == ERANGE || unit == bufmode)
|
|
warn("Wrong buffer mode '%s' for %s", bufmode,
|
|
stream_name(s));
|
|
switch (*unit) {
|
|
case 'G':
|
|
bufsize *= 1024 * 1024 * 1024;
|
|
break;
|
|
case 'M':
|
|
bufsize *= 1024 * 1024;
|
|
break;
|
|
case 'k':
|
|
bufsize *= 1024;
|
|
break;
|
|
case '\0':
|
|
break;
|
|
default:
|
|
warnx("Unknown suffix '%c' for %s", *unit,
|
|
stream_name(s));
|
|
return;
|
|
}
|
|
mode = _IOFBF;
|
|
}
|
|
if (setvbuf(s, NULL, mode, bufsize) != 0)
|
|
warn("Cannot set buffer mode '%s' for %s", bufmode,
|
|
stream_name(s));
|
|
}
|
|
|
|
__attribute__ ((constructor)) static void
|
|
stdbuf(void)
|
|
{
|
|
char *i_mode, *o_mode, *e_mode;
|
|
|
|
i_mode = getenv("_STDBUF_I");
|
|
o_mode = getenv("_STDBUF_O");
|
|
e_mode = getenv("_STDBUF_E");
|
|
|
|
if (e_mode != NULL)
|
|
change_buf(stderr, e_mode);
|
|
if (i_mode != NULL)
|
|
change_buf(stdin, i_mode);
|
|
if (o_mode != NULL)
|
|
change_buf(stdout, o_mode);
|
|
}
|