[apple/libc.git] / gen / getbsize.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */


#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *
getbsize(headerlenp, blocksizep)
	int *headerlenp;
	long *blocksizep;
{
	static char header[20];
	long n, max, mul, blocksize;
	char *ep, *p, *form;

#define	KB	(1024L)
#define	MB	(1024L * 1024L)
#define	GB	(1024L * 1024L * 1024L)
#define	MAXB	GB		/* No tera, peta, nor exa. */
	form = "";
	if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') {
		if ((n = strtol(p, &ep, 10)) < 0)
			goto underflow;
		if (n == 0)
			n = 1;
		if (*ep && ep[1])
			goto fmterr;
		switch (*ep) {
		case 'G': case 'g':
			form = "G";
			max = MAXB / GB;
			mul = GB;
			break;
		case 'K': case 'k':
			form = "K";
			max = MAXB / KB;
			mul = KB;
			break;
		case 'M': case 'm':
			form = "M";
			max = MAXB / MB;
			mul = MB;
			break;
		case '\0':
			max = MAXB;
			mul = 1;
			break;
		default:
fmterr:			warnx("%s: unknown blocksize", p);
			n = 512;
			mul = 1;
			break;
		}
		if (n > max) {
			warnx("maximum blocksize is %dG", MAXB / GB);
			n = max;
		}
		if ((blocksize = n * mul) < 512) {
underflow:		warnx("minimum blocksize is 512");
			form = "";
			blocksize = n = 512;
		}
	} else
		blocksize = n = 512;

	(void)snprintf(header, sizeof(header), "%d%s-blocks", n, form);
	*headerlenp = strlen(header);
	*blocksizep = blocksize;
	return (header);
}
Commit	Line	Data
e9ce8d39 A	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
734aad71	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
e9ce8d39	7	*
734aad71 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
e9ce8d39 A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
e9ce8d39 A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
734aad71 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
e9ce8d39 A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* Copyright (c) 1991, 1993
	27	* The Regents of the University of California. All rights reserved.
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions
	31	* are met:
	32	* 1. Redistributions of source code must retain the above copyright
	33	* notice, this list of conditions and the following disclaimer.
	34	* 2. Redistributions in binary form must reproduce the above copyright
	35	* notice, this list of conditions and the following disclaimer in the
	36	* documentation and/or other materials provided with the distribution.
	37	* 3. All advertising materials mentioning features or use of this software
	38	* must display the following acknowledgement:
	39	* This product includes software developed by the University of
	40	* California, Berkeley and its contributors.
	41	* 4. Neither the name of the University nor the names of its contributors
	42	* may be used to endorse or promote products derived from this software
	43	* without specific prior written permission.
	44	*
	45	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	46	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	47	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	48	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	49	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	50	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	51	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	52	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	53	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	54	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	55	* SUCH DAMAGE.
	56	*/
	57
	58
	59	#include <err.h>
	60	#include <stdio.h>
	61	#include <stdlib.h>
	62	#include <string.h>
	63
	64	char *
	65	getbsize(headerlenp, blocksizep)
	66	int *headerlenp;
	67	long *blocksizep;
	68	{
	69	static char header[20];
	70	long n, max, mul, blocksize;
	71	char ep, p, *form;
	72
	73	#define KB (1024L)
	74	#define MB (1024L * 1024L)
	75	#define GB (1024L * 1024L * 1024L)
	76	#define MAXB GB /* No tera, peta, nor exa. */
	77	form = "";
	78	if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') {
	79	if ((n = strtol(p, &ep, 10)) < 0)
	80	goto underflow;
	81	if (n == 0)
	82	n = 1;
	83	if (*ep && ep[1])
	84	goto fmterr;
	85	switch (*ep) {
86	case 'G': case 'g':
87	form = "G";
88	max = MAXB / GB;
89	mul = GB;
90	break;
91	case 'K': case 'k':
92	form = "K";
93	max = MAXB / KB;
94	mul = KB;
95	break;
96	case 'M': case 'm':
97	form = "M";
98	max = MAXB / MB;
99	mul = MB;
100	break;
101	case '\0':
102	max = MAXB;
103	mul = 1;
104	break;
105	default:
106	fmterr: warnx("%s: unknown blocksize", p);
107	n = 512;
108	mul = 1;
109	break;
110	}
111	if (n > max) {
112	warnx("maximum blocksize is %dG", MAXB / GB);
113	n = max;
114	}
115	if ((blocksize = n * mul) < 512) {
116	underflow: warnx("minimum blocksize is 512");
117	form = "";
118	blocksize = n = 512;
119	}
120	} else
121	blocksize = n = 512;
122
123	(void)snprintf(header, sizeof(header), "%d%s-blocks", n, form);
124	*headerlenp = strlen(header);
125	*blocksizep = blocksize;
126	return (header);
127	}