1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007 Eric Anderson <anderson@FreeBSD.org>
5 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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#include <sys/types.h>
31#include <ctype.h>
32#include <errno.h>
33#include <inttypes.h>
34#include <libutil.h>
35#include <stdint.h>
36
37int
38expand_number(const char *buf, uint64_t *num)
39{
40	char *endptr;
41	uintmax_t umaxval;
42	uint64_t number;
43	unsigned shift;
44	int serrno;
45
46	serrno = errno;
47	errno = 0;
48	umaxval = strtoumax(buf, &endptr, 0);
49	if (umaxval > UINT64_MAX)
50		errno = ERANGE;
51	if (errno != 0)
52		return (-1);
53	errno = serrno;
54	number = umaxval;
55
56	switch (tolower((unsigned char)*endptr)) {
57	case 'e':
58		shift = 60;
59		break;
60	case 'p':
61		shift = 50;
62		break;
63	case 't':
64		shift = 40;
65		break;
66	case 'g':
67		shift = 30;
68		break;
69	case 'm':
70		shift = 20;
71		break;
72	case 'k':
73		shift = 10;
74		break;
75	case 'b':
76		shift = 0;
77		break;
78	case '\0': /* No unit. */
79		*num = number;
80		return (0);
81	default:
82		/* Unrecognized unit. */
83		errno = EINVAL;
84		return (-1);
85	}
86
87	/*
88	 * Treat 'b' as an ignored suffix for all unit except 'b',
89	 * otherwise there should be no remaining character(s).
90	 */
91	endptr++;
92	if (shift != 0 && tolower((unsigned char)*endptr) == 'b')
93		endptr++;
94	if (*endptr != '\0') {
95		errno = EINVAL;
96		return (-1);
97	}
98
99	if ((number << shift) >> shift != number) {
100		/* Overflow */
101		errno = ERANGE;
102		return (-1);
103	}
104	*num = number << shift;
105	return (0);
106}
107