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