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/* $OpenBSD: getbsize.c,v 1.11 2015/08/31 02:53:57 guenther Exp $ */ |
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/*- |
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* Copyright (c) 1991, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <err.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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char * |
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getbsize(int *headerlenp, long *blocksizep) |
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{ |
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static char header[20]; |
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long n, max, mul, blocksize; |
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char *ep, *p, *form; |
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#define KB (1024) |
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#define MB (1024 * 1024) |
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#define GB (1024 * 1024 * 1024) |
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#define MAXB GB /* No tera, peta, nor exa. */ |
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form = ""; |
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✗✓✗✗
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if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { |
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if ((n = strtol(p, &ep, 10)) < 0) |
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goto underflow; |
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if (n == 0) |
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n = 1; |
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if (*ep && ep[1]) |
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goto fmterr; |
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switch (*ep) { |
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case 'G': case 'g': |
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form = "G"; |
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max = MAXB / GB; |
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mul = GB; |
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break; |
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case 'K': case 'k': |
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form = "K"; |
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max = MAXB / KB; |
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mul = KB; |
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break; |
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case 'M': case 'm': |
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form = "M"; |
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max = MAXB / MB; |
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mul = MB; |
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break; |
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case '\0': |
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max = MAXB; |
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mul = 1; |
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break; |
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default: |
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fmterr: warnx("%s: unknown blocksize", p); |
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n = 512; |
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max = MAXB; |
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mul = 1; |
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break; |
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} |
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if (n > max) { |
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warnx("maximum blocksize is %dG", MAXB / GB); |
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n = max; |
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} |
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if ((blocksize = n * mul) < 512) { |
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underflow: warnx("%s: minimum blocksize is 512", p); |
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form = ""; |
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blocksize = n = 512; |
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} |
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} else |
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blocksize = n = 512; |
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*headerlenp = snprintf(header, sizeof(header), "%ld%s-blocks", n, form); |
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✗✓ |
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if (*headerlenp < 0) |
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*headerlenp = 0; |
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✗✓ |
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else if (*headerlenp >= sizeof(header)) |
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*headerlenp = sizeof(header) - 1; |
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*blocksizep = blocksize; |
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return (header); |
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} |