1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 /*static char sccsid[] = "from: @(#)getbsize.c 5.3 (Berkeley) 3/9/92";*/ 36 static char rcsid[] = "$Id: getbsize.c,v 1.3 1994/01/25 21:03:26 cgd Exp $"; 37 #endif /* not lint */ 38 39 #include <err.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 44 char * 45 getbsize(headerlenp, blocksizep) 46 int *headerlenp; 47 long *blocksizep; 48 { 49 static char header[20]; 50 long n, max, mul, blocksize; 51 char *ep, *p, *form; 52 53 #define KB (1024L) 54 #define MB (1024L * 1024L) 55 #define GB (1024L * 1024L * 1024L) 56 #define MAXB GB /* No tera, peta, nor exa. */ 57 form = ""; 58 if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { 59 if ((n = strtol(p, &ep, 10)) < 0) 60 goto underflow; 61 if (n == 0) 62 n = 1; 63 if (*ep && ep[1]) 64 goto fmterr; 65 switch (*ep) { 66 case 'G': case 'g': 67 form = "G"; 68 max = MAXB / GB; 69 mul = GB; 70 break; 71 case 'K': case 'k': 72 form = "K"; 73 max = MAXB / KB; 74 mul = KB; 75 break; 76 case 'M': case 'm': 77 form = "M"; 78 max = MAXB / MB; 79 mul = MB; 80 break; 81 case '\0': 82 max = MAXB; 83 mul = 1; 84 break; 85 default: 86 fmterr: warnx("%s: unknown blocksize", p); 87 n = 512; 88 mul = 1; 89 break; 90 } 91 if (n > max) { 92 warnx("maximum blocksize is %dG", MAXB / GB); 93 n = max; 94 } 95 if ((blocksize = n * mul) < 512) { 96 underflow: warnx("%s: minimum blocksize is 512"); 97 form = ""; 98 blocksize = n = 512; 99 } 100 } else 101 blocksize = n = 512; 102 103 *headerlenp = snprintf(header, sizeof(header), "%d%s-blocks", n, form); 104 *blocksizep = blocksize; 105 return (header); 106 } 107