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Commit	Line	Data
	1	/*-
	2	* Copyright (c) 1991, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)getbsize.c 8.1 (Berkeley) 6/4/93";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
	34	__FBSDID("$FreeBSD$");
	35
	36	#include <err.h>
	37	#include <stdio.h>
	38	#include <stdlib.h>
	39	#include <string.h>
	40
	41	char *
	42	getbsize(int headerlenp, long blocksizep)
	43	{
	44	static char header[20];
	45	long n, max, mul, blocksize;
	46	char ep, p;
	47	const char *form;
	48
	49	#define KB (1024L)
	50	#define MB (1024L * 1024L)
	51	#define GB (1024L * 1024L * 1024L)
	52	#define MAXB GB /* No tera, peta, nor exa. */
	53	form = "";
	54	if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') {
	55	if ((n = strtol(p, &ep, 10)) < 0)
	56	goto underflow;
	57	if (n == 0)
	58	n = 1;
	59	if (*ep && ep[1])
	60	goto fmterr;
	61	switch (*ep) {
	62	case 'G': case 'g':
	63	form = "G";
	64	max = MAXB / GB;
	65	mul = GB;
	66	break;
	67	case 'K': case 'k':
	68	form = "K";
	69	max = MAXB / KB;
	70	mul = KB;
	71	break;
	72	case 'M': case 'm':
	73	form = "M";
	74	max = MAXB / MB;
	75	mul = MB;
	76	break;
	77	case '\0':
	78	max = MAXB;
	79	mul = 1;
	80	break;
	81	default:
	82	fmterr: warnx("%s: unknown blocksize", p);
	83	n = 512;
	84	max = MAXB;
	85	mul = 1;
	86	break;
	87	}
	88	if (n > max) {
	89	warnx("maximum blocksize is %ldG", MAXB / GB);
	90	n = max;
	91	}
	92	if ((blocksize = n * mul) < 512) {
	93	underflow: warnx("minimum blocksize is 512");
	94	form = "";
	95	blocksize = n = 512;
	96	}
	97	} else
	98	blocksize = n = 512;
	99
	100	(void)snprintf(header, sizeof(header), "%ld%s-blocks", n, form);
	101	*headerlenp = strlen(header);
	102	*blocksizep = blocksize;
	103	return (header);
	104	}