getbsize.c revision 108445
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 3492986Sobrien#if defined(LIBC_SCCS) && !defined(lint) 351573Srgrimesstatic char sccsid[] = "@(#)getbsize.c 8.1 (Berkeley) 6/4/93"; 3692986Sobrien#endif /* LIBC_SCCS and not lint */ 3792986Sobrien#include <sys/cdefs.h> 3892986Sobrien__FBSDID("$FreeBSD: head/lib/libc/gen/getbsize.c 108445 2002-12-30 11:12:16Z obrien $"); 391573Srgrimes 401573Srgrimes#include <err.h> 411573Srgrimes#include <stdio.h> 421573Srgrimes#include <stdlib.h> 431573Srgrimes#include <string.h> 441573Srgrimes 451573Srgrimeschar * 461573Srgrimesgetbsize(headerlenp, blocksizep) 47108445Sobrien int *headerlenp; 481573Srgrimes long *blocksizep; 491573Srgrimes{ 501573Srgrimes static char header[20]; 511573Srgrimes long n, max, mul, blocksize; 52105797Smarkm char *ep, *p; 53105797Smarkm const char *form; 541573Srgrimes 551573Srgrimes#define KB (1024L) 561573Srgrimes#define MB (1024L * 1024L) 571573Srgrimes#define GB (1024L * 1024L * 1024L) 581573Srgrimes#define MAXB GB /* No tera, peta, nor exa. */ 591573Srgrimes form = ""; 601573Srgrimes if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { 611573Srgrimes if ((n = strtol(p, &ep, 10)) < 0) 621573Srgrimes goto underflow; 631573Srgrimes if (n == 0) 641573Srgrimes n = 1; 651573Srgrimes if (*ep && ep[1]) 661573Srgrimes goto fmterr; 671573Srgrimes switch (*ep) { 681573Srgrimes case 'G': case 'g': 691573Srgrimes form = "G"; 701573Srgrimes max = MAXB / GB; 711573Srgrimes mul = GB; 721573Srgrimes break; 731573Srgrimes case 'K': case 'k': 741573Srgrimes form = "K"; 751573Srgrimes max = MAXB / KB; 761573Srgrimes mul = KB; 771573Srgrimes break; 781573Srgrimes case 'M': case 'm': 791573Srgrimes form = "M"; 801573Srgrimes max = MAXB / MB; 811573Srgrimes mul = MB; 821573Srgrimes break; 831573Srgrimes case '\0': 841573Srgrimes max = MAXB; 851573Srgrimes mul = 1; 861573Srgrimes break; 871573Srgrimes default: 881573Srgrimesfmterr: warnx("%s: unknown blocksize", p); 891573Srgrimes n = 512; 901573Srgrimes mul = 1; 911573Srgrimes break; 921573Srgrimes } 931573Srgrimes if (n > max) { 9437301Sbde warnx("maximum blocksize is %ldG", MAXB / GB); 951573Srgrimes n = max; 961573Srgrimes } 971573Srgrimes if ((blocksize = n * mul) < 512) { 981573Srgrimesunderflow: warnx("minimum blocksize is 512"); 991573Srgrimes form = ""; 1001573Srgrimes blocksize = n = 512; 1011573Srgrimes } 1021573Srgrimes } else 1031573Srgrimes blocksize = n = 512; 1041573Srgrimes 10538020Sbde (void)snprintf(header, sizeof(header), "%ld%s-blocks", n, form); 1061573Srgrimes *headerlenp = strlen(header); 1071573Srgrimes *blocksizep = blocksize; 1081573Srgrimes return (header); 1091573Srgrimes} 110