1 /* $NetBSD: getbsize.c,v 1.9 1997/07/13 18:59:34 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)getbsize.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: getbsize.c,v 1.9 1997/07/13 18:59:34 christos Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include "namespace.h" 46 #include <err.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 char * 52 getbsize(headerlenp, blocksizep) 53 int *headerlenp; 54 long *blocksizep; 55 { 56 static char header[20]; 57 long n, max, mul, blocksize; 58 char *ep, *p, *form; 59 60 #define KB (1024L) 61 #define MB (1024L * 1024L) 62 #define GB (1024L * 1024L * 1024L) 63 #define MAXB GB /* No tera, peta, nor exa. */ 64 form = ""; 65 if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { 66 if ((n = strtol(p, &ep, 10)) < 0) 67 goto underflow; 68 if (n == 0) 69 n = 1; 70 if (*ep && ep[1]) 71 goto fmterr; 72 switch (*ep) { 73 case 'G': case 'g': 74 form = "G"; 75 max = MAXB / GB; 76 mul = GB; 77 break; 78 case 'K': case 'k': 79 form = "K"; 80 max = MAXB / KB; 81 mul = KB; 82 break; 83 case 'M': case 'm': 84 form = "M"; 85 max = MAXB / MB; 86 mul = MB; 87 break; 88 case '\0': 89 max = MAXB; 90 mul = 1; 91 break; 92 default: 93 fmterr: warnx("%s: unknown blocksize", p); 94 n = 512; 95 mul = 1; 96 max = 0; 97 break; 98 } 99 if (n > max) { 100 warnx("maximum blocksize is %ldG", MAXB / GB); 101 n = max; 102 } 103 if ((blocksize = n * mul) < 512) { 104 underflow: warnx("%s: minimum blocksize is 512", p); 105 form = ""; 106 blocksize = n = 512; 107 } 108 } else 109 blocksize = n = 512; 110 111 *headerlenp = snprintf(header, sizeof(header), "%ld%s-blocks", n, form); 112 *blocksizep = blocksize; 113 return (header); 114 } 115