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 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)getbsize.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <err.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 char * 46 getbsize(headerlenp, blocksizep) 47 int *headerlenp; 48 long *blocksizep; 49 { 50 static char header[20]; 51 long n, max, mul, blocksize; 52 char *ep, *p, *form; 53 54 #define KB (1024L) 55 #define MB (1024L * 1024L) 56 #define GB (1024L * 1024L * 1024L) 57 #define MAXB GB /* No tera, peta, nor exa. */ 58 form = ""; 59 if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { 60 if ((n = strtol(p, &ep, 10)) < 0) 61 goto underflow; 62 if (n == 0) 63 n = 1; 64 if (*ep && ep[1]) 65 goto fmterr; 66 switch (*ep) { 67 case 'G': case 'g': 68 form = "G"; 69 max = MAXB / GB; 70 mul = GB; 71 break; 72 case 'K': case 'k': 73 form = "K"; 74 max = MAXB / KB; 75 mul = KB; 76 break; 77 case 'M': case 'm': 78 form = "M"; 79 max = MAXB / MB; 80 mul = MB; 81 break; 82 case '\0': 83 max = MAXB; 84 mul = 1; 85 break; 86 default: 87 fmterr: warnx("%s: unknown blocksize", p); 88 n = 512; 89 mul = 1; 90 break; 91 } 92 if (n > max) { 93 warnx("maximum blocksize is %ldG", MAXB / GB); 94 n = max; 95 } 96 if ((blocksize = n * mul) < 512) { 97 underflow: warnx("minimum blocksize is 512"); 98 form = ""; 99 blocksize = n = 512; 100 } 101 } else 102 blocksize = n = 512; 103 104 (void)snprintf(header, sizeof(header), "%ld%s-blocks", n, form); 105 *headerlenp = strlen(header); 106 *blocksizep = blocksize; 107 return (header); 108 } 109