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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)getbsize.c 8.1 (Berkeley) 6/4/93"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 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(headerlenp, blocksizep) 43 int *headerlenp; 44 long *blocksizep; 45 { 46 static char header[20]; 47 long n, max, mul, blocksize; 48 char *ep, *p; 49 const char *form; 50 51 #define KB (1024L) 52 #define MB (1024L * 1024L) 53 #define GB (1024L * 1024L * 1024L) 54 #define MAXB GB /* No tera, peta, nor exa. */ 55 form = ""; 56 if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { 57 if ((n = strtol(p, &ep, 10)) < 0) 58 goto underflow; 59 if (n == 0) 60 n = 1; 61 if (*ep && ep[1]) 62 goto fmterr; 63 switch (*ep) { 64 case 'G': case 'g': 65 form = "G"; 66 max = MAXB / GB; 67 mul = GB; 68 break; 69 case 'K': case 'k': 70 form = "K"; 71 max = MAXB / KB; 72 mul = KB; 73 break; 74 case 'M': case 'm': 75 form = "M"; 76 max = MAXB / MB; 77 mul = MB; 78 break; 79 case '\0': 80 max = MAXB; 81 mul = 1; 82 break; 83 default: 84 fmterr: warnx("%s: unknown blocksize", p); 85 n = 512; 86 mul = 1; 87 break; 88 } 89 if (n > max) { 90 warnx("maximum blocksize is %ldG", MAXB / GB); 91 n = max; 92 } 93 if ((blocksize = n * mul) < 512) { 94 underflow: warnx("minimum blocksize is 512"); 95 form = ""; 96 blocksize = n = 512; 97 } 98 } else 99 blocksize = n = 512; 100 101 (void)snprintf(header, sizeof(header), "%ld%s-blocks", n, form); 102 *headerlenp = strlen(header); 103 *blocksizep = blocksize; 104 return (header); 105 } 106