121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
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/* $NetBSD: getbsize.c,v 1.16 2005/11/29 03:11:59 christos Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)getbsize.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: getbsize.c,v 1.16 2005/11/29 03:11:59 christos Exp $");
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#endif
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#endif /* not lint */
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#include "namespace.h"
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#include <assert.h>
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#include <err.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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#ifdef __weak_alias
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__weak_alias(getbsize,_getbsize)
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#endif
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char *
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getbsize(headerlenp, blocksizep)
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int *headerlenp;
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long *blocksizep;
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{
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static char header[20];
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long n, max, mul, blocksize;
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char *ep, *p;
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const char *form;
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#define KB (1024L)
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#define MB (1024L * 1024L)
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#define GB (1024L * 1024L * 1024L)
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#define MAXB GB /* No tera, peta, nor exa. */
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form = "";
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if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') {
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if ((n = strtol(p, &ep, 10)) < 0)
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goto underflow;
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if (n == 0)
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n = 1;
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if (*ep && ep[1])
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goto fmterr;
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switch (*ep) {
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case 'G': case 'g':
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form = "G";
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max = MAXB / GB;
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mul = GB;
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break;
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case 'K': case 'k':
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form = "K";
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max = MAXB / KB;
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mul = KB;
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break;
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case 'M': case 'm':
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form = "M";
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max = MAXB / MB;
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mul = MB;
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break;
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case '\0':
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max = MAXB;
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mul = 1;
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break;
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default:
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fmterr: warnx("%s: unknown blocksize", p);
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n = 512;
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mul = 1;
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max = 0;
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break;
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}
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if (n > max) {
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warnx("maximum blocksize is %ldG", MAXB / GB);
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n = max;
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}
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if ((blocksize = n * mul) < 512) {
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underflow: warnx("%s: minimum blocksize is 512", p);
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form = "";
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blocksize = n = 512;
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}
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} else
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blocksize = n = 512;
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if (headerlenp)
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*headerlenp =
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snprintf(header, sizeof(header), "%ld%s-blocks", n, form);
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if (blocksizep)
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*blocksizep = blocksize;
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return (header);
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}
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