/*-
* 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define LIBSTDBUF "/usr/lib/libstdbuf.so"
#define LIBSTDBUF32 "/usr/lib32/libstdbuf.so"
static int
appendenv(const char *key, const char *value)
{
char *curval, *newpair;
int ret;
curval = getenv(key);
if (curval == NULL)
ret = asprintf(&newpair, "%s=%s", key, value);
else
ret = asprintf(&newpair, "%s=%s:%s", key, curval, value);
if (ret > 0)
ret = putenv(newpair);
if (ret < 0)
warn("Failed to set environment variable: %s", key);
return (ret);
}
static void
usage(void)
{
fprintf(stderr,
"usage: stdbuf [-e 0|L|B|<sz>] [-i 0|L|B|<sz>] [-o 0|L|B|<sz>] "
"<cmd> [args ...]\n");
exit(1);
}
int
main(int argc, char *argv[])
{
char *ibuf, *obuf, *ebuf;
int i;
ibuf = obuf = ebuf = NULL;
while ((i = getopt(argc, argv, "e:i:o:")) != -1) {
switch (i) {
case 'e':
ebuf = optarg;
break;
case 'i':
ibuf = optarg;
break;
case 'o':
obuf = optarg;
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc == 0)
exit(0);
if (ibuf != NULL && setenv("_STDBUF_I", ibuf, 1) == -1)
warn("Failed to set environment variable: %s=%s",
"_STDBUF_I", ibuf);
if (obuf != NULL && setenv("_STDBUF_O", obuf, 1) == -1)
warn("Failed to set environment variable: %s=%s",
"_STDBUF_O", obuf);
if (ebuf != NULL && setenv("_STDBUF_E", ebuf, 1) == -1)
warn("Failed to set environment variable: %s=%s",
"_STDBUF_E", ebuf);
appendenv("LD_PRELOAD", LIBSTDBUF);
appendenv("LD_32_PRELOAD", LIBSTDBUF32);
execvp(argv[0], argv);
err(2, "%s", argv[0]);
}
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