1/*-
2 * Copyright (c) 2007 Eric Anderson <anderson@FreeBSD.org>
3 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <sys/types.h>
32#include <ctype.h>
33#include <errno.h>
34#include <inttypes.h>
35#include <libutil.h>
36#include <stdint.h>
37
38int
39expand_number(const char *buf, uint64_t *num)
40{
41	char *endptr;
42	uintmax_t umaxval;
43	uint64_t number;
44	unsigned shift;
45	int serrno;
46
47	serrno = errno;
48	errno = 0;
49	umaxval = strtoumax(buf, &endptr, 0);
50	if (umaxval > UINT64_MAX)
51		errno = ERANGE;
52	if (errno != 0)
53		return (-1);
54	errno = serrno;
55	number = umaxval;
56
57	switch (tolower((unsigned char)*endptr)) {
58	case 'e':
59		shift = 60;
60		break;
61	case 'p':
62		shift = 50;
63		break;
64	case 't':
65		shift = 40;
66		break;
67	case 'g':
68		shift = 30;
69		break;
70	case 'm':
71		shift = 20;
72		break;
73	case 'k':
74		shift = 10;
75		break;
76	case 'b':
77	case '\0': /* No unit. */
78		*num = number;
79		return (0);
80	default:
81		/* Unrecognized unit. */
82		errno = EINVAL;
83		return (-1);
84	}
85
86	if ((number << shift) >> shift != number) {
87		/* Overflow */
88		errno = ERANGE;
89		return (-1);
90	}
91	*num = number << shift;
92	return (0);
93}
94