getbsize.c revision 38020
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1991, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 321573Srgrimes */ 331573Srgrimes 341573Srgrimes#ifndef lint 351573Srgrimesstatic char sccsid[] = "@(#)getbsize.c 8.1 (Berkeley) 6/4/93"; 361573Srgrimes#endif /* not lint */ 371573Srgrimes 381573Srgrimes#include <err.h> 391573Srgrimes#include <stdio.h> 401573Srgrimes#include <stdlib.h> 411573Srgrimes#include <string.h> 421573Srgrimes 431573Srgrimeschar * 441573Srgrimesgetbsize(headerlenp, blocksizep) 451573Srgrimes int *headerlenp; 461573Srgrimes long *blocksizep; 471573Srgrimes{ 481573Srgrimes static char header[20]; 491573Srgrimes long n, max, mul, blocksize; 501573Srgrimes char *ep, *p, *form; 511573Srgrimes 521573Srgrimes#define KB (1024L) 531573Srgrimes#define MB (1024L * 1024L) 541573Srgrimes#define GB (1024L * 1024L * 1024L) 551573Srgrimes#define MAXB GB /* No tera, peta, nor exa. */ 561573Srgrimes form = ""; 571573Srgrimes if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { 581573Srgrimes if ((n = strtol(p, &ep, 10)) < 0) 591573Srgrimes goto underflow; 601573Srgrimes if (n == 0) 611573Srgrimes n = 1; 621573Srgrimes if (*ep && ep[1]) 631573Srgrimes goto fmterr; 641573Srgrimes switch (*ep) { 651573Srgrimes case 'G': case 'g': 661573Srgrimes form = "G"; 671573Srgrimes max = MAXB / GB; 681573Srgrimes mul = GB; 691573Srgrimes break; 701573Srgrimes case 'K': case 'k': 711573Srgrimes form = "K"; 721573Srgrimes max = MAXB / KB; 731573Srgrimes mul = KB; 741573Srgrimes break; 751573Srgrimes case 'M': case 'm': 761573Srgrimes form = "M"; 771573Srgrimes max = MAXB / MB; 781573Srgrimes mul = MB; 791573Srgrimes break; 801573Srgrimes case '\0': 811573Srgrimes max = MAXB; 821573Srgrimes mul = 1; 831573Srgrimes break; 841573Srgrimes default: 851573Srgrimesfmterr: warnx("%s: unknown blocksize", p); 861573Srgrimes n = 512; 871573Srgrimes mul = 1; 881573Srgrimes break; 891573Srgrimes } 901573Srgrimes if (n > max) { 9137301Sbde warnx("maximum blocksize is %ldG", MAXB / GB); 921573Srgrimes n = max; 931573Srgrimes } 941573Srgrimes if ((blocksize = n * mul) < 512) { 951573Srgrimesunderflow: warnx("minimum blocksize is 512"); 961573Srgrimes form = ""; 971573Srgrimes blocksize = n = 512; 981573Srgrimes } 991573Srgrimes } else 1001573Srgrimes blocksize = n = 512; 1011573Srgrimes 10238020Sbde (void)snprintf(header, sizeof(header), "%ld%s-blocks", n, form); 1031573Srgrimes *headerlenp = strlen(header); 1041573Srgrimes *blocksizep = blocksize; 1051573Srgrimes return (header); 1061573Srgrimes} 107