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: head/lib/libutil/expand_number.c 255069 2013-08-30 11:21:52Z pluknet $");
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
38 int
expand_number(const char * buf,uint64_t * num)39 expand_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 #ifdef __FreeBSD__
51 if (umaxval > UINT64_MAX)
52 errno = ERANGE;
53 #endif
54 if (errno != 0)
55 return (-1);
56 errno = serrno;
57 number = umaxval;
58
59 switch (tolower((unsigned char)*endptr)) {
60 case 'e':
61 shift = 60;
62 break;
63 case 'p':
64 shift = 50;
65 break;
66 case 't':
67 shift = 40;
68 break;
69 case 'g':
70 shift = 30;
71 break;
72 case 'm':
73 shift = 20;
74 break;
75 case 'k':
76 shift = 10;
77 break;
78 case 'b':
79 case '\0': /* No unit. */
80 *num = number;
81 return (0);
82 default:
83 /* Unrecognized unit. */
84 errno = EINVAL;
85 return (-1);
86 }
87
88 if ((number << shift) >> shift != number) {
89 /* Overflow */
90 errno = ERANGE;
91 return (-1);
92 }
93 *num = number << shift;
94 return (0);
95 }
96