1 /* $NetBSD: getbsize.c,v 1.6 1995/02/25 13:41:34 cgd 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)getbsize.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 static char rcsid[] = "$NetBSD: getbsize.c,v 1.6 1995/02/25 13:41:34 cgd Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #include <err.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 49 char * 50 getbsize(headerlenp, blocksizep) 51 int *headerlenp; 52 long *blocksizep; 53 { 54 static char header[20]; 55 long n, max, mul, blocksize; 56 char *ep, *p, *form; 57 58 #define KB (1024L) 59 #define MB (1024L * 1024L) 60 #define GB (1024L * 1024L * 1024L) 61 #define MAXB GB /* No tera, peta, nor exa. */ 62 form = ""; 63 if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { 64 if ((n = strtol(p, &ep, 10)) < 0) 65 goto underflow; 66 if (n == 0) 67 n = 1; 68 if (*ep && ep[1]) 69 goto fmterr; 70 switch (*ep) { 71 case 'G': case 'g': 72 form = "G"; 73 max = MAXB / GB; 74 mul = GB; 75 break; 76 case 'K': case 'k': 77 form = "K"; 78 max = MAXB / KB; 79 mul = KB; 80 break; 81 case 'M': case 'm': 82 form = "M"; 83 max = MAXB / MB; 84 mul = MB; 85 break; 86 case '\0': 87 max = MAXB; 88 mul = 1; 89 break; 90 default: 91 fmterr: _warnx("%s: unknown blocksize", p); 92 n = 512; 93 mul = 1; 94 break; 95 } 96 if (n > max) { 97 _warnx("maximum blocksize is %dG", MAXB / GB); 98 n = max; 99 } 100 if ((blocksize = n * mul) < 512) { 101 underflow: _warnx("%s: minimum blocksize is 512"); 102 form = ""; 103 blocksize = n = 512; 104 } 105 } else 106 blocksize = n = 512; 107 108 *headerlenp = snprintf(header, sizeof(header), "%d%s-blocks", n, form); 109 *blocksizep = blocksize; 110 return (header); 111 } 112