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
37 int
expand_number(const char * buf,uint64_t * num)38 expand_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