1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)getbsize.c 8.1 (Berkeley) 6/4/93"); 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 } 105