1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. 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 * @(#)getbsize.c 8.1 (Berkeley) 6/4/93 34 * $DragonFly: src/lib/libc/gen/getbsize.c,v 1.4 2005/11/13 00:07:42 swildner Exp $ 35 */ 36 37 #include <err.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 42 char * 43 getbsize(int *headerlenp, long *blocksizep) 44 { 45 static char header[20]; 46 long n, max, mul, blocksize; 47 char *ep, *p; 48 const char *form; 49 50 #define KB (1024L) 51 #define MB (1024L * 1024L) 52 #define GB (1024L * 1024L * 1024L) 53 #define MAXB GB /* No tera, peta, nor exa. */ 54 form = ""; 55 if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { 56 if ((n = strtol(p, &ep, 10)) < 0) 57 goto underflow; 58 if (n == 0) 59 n = 1; 60 if (*ep && ep[1]) 61 goto fmterr; 62 switch (*ep) { 63 case 'G': case 'g': 64 form = "G"; 65 max = MAXB / GB; 66 mul = GB; 67 break; 68 case 'K': case 'k': 69 form = "K"; 70 max = MAXB / KB; 71 mul = KB; 72 break; 73 case 'M': case 'm': 74 form = "M"; 75 max = MAXB / MB; 76 mul = MB; 77 break; 78 case '\0': 79 max = MAXB; 80 mul = 1; 81 break; 82 default: 83 fmterr: warnx("%s: unknown blocksize", p); 84 max = n = 512; 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 snprintf(header, sizeof(header), "%ld%s-blocks", n, form); 101 *headerlenp = strlen(header); 102 *blocksizep = blocksize; 103 return (header); 104 } 105