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
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 #ifdef __FreeBSD__
50 if (umaxval > UINT64_MAX)
51 errno = ERANGE;
52 #endif
53 if (errno != 0)
54 return (-1);
55 errno = serrno;
56 number = umaxval;
57
58 switch (tolower((unsigned char)*endptr)) {
59 case 'e':
60 shift = 60;
61 break;
62 case 'p':
63 shift = 50;
64 break;
65 case 't':
66 shift = 40;
67 break;
68 case 'g':
69 shift = 30;
70 break;
71 case 'm':
72 shift = 20;
73 break;
74 case 'k':
75 shift = 10;
76 break;
77 case 'b':
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 if ((number << shift) >> shift != number) {
88 /* Overflow */
89 errno = ERANGE;
90 return (-1);
91 }
92 *num = number << shift;
93 return (0);
94 }
95