1 /* $NetBSD: dehumanize_number.c,v 1.3 2008/04/28 20:22:59 martin Exp $ */
2
3 /*
4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
9 * 2005 program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <inttypes.h>
34 #include <ctype.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <errno.h>
38 #include <limits.h>
39 #include <libutil.h>
40
41 /*
42 * Converts the number given in 'str', which may be given in a humanized
43 * form (as described in humanize_number(3), but with some limitations),
44 * to an int64_t without units.
45 * In case of success, 0 is returned and *size holds the value.
46 * Otherwise, -1 is returned and *size is untouched.
47 *
48 * TODO: Internationalization, SI units.
49 */
50 int
dehumanize_number(const char * str,int64_t * size)51 dehumanize_number(const char *str, int64_t *size)
52 {
53 char *ep, unit;
54 const char *delimit;
55 long multiplier;
56 long long tmp, tmp2;
57 size_t len;
58
59 len = strlen(str);
60 if (len == 0) {
61 errno = EINVAL;
62 return -1;
63 }
64
65 multiplier = 1;
66
67 unit = str[len - 1];
68 if (isalpha((unsigned char)unit)) {
69 switch (tolower((unsigned char)unit)) {
70 case 'e':
71 multiplier *= 1024;
72 /* FALLTHROUGH */
73 case 'p':
74 multiplier *= 1024;
75 /* FALLTHROUGH */
76 case 't':
77 multiplier *= 1024;
78 /* FALLTHROUGH */
79 case 'g':
80 multiplier *= 1024;
81 /* FALLTHROUGH */
82 case 'm':
83 multiplier *= 1024;
84 /* FALLTHROUGH */
85 case 'k':
86 multiplier *= 1024;
87 /* FALLTHROUGH */
88 case 'b':
89 break;
90
91 default:
92 errno = EINVAL;
93 return -1; /* Invalid suffix. */
94 }
95
96 delimit = &str[len - 1];
97 } else
98 delimit = NULL;
99
100 errno = 0;
101 tmp = strtoll(str, &ep, 10);
102 if (str[0] == '\0' || (ep != delimit && *ep != '\0'))
103 return -1; /* Not a number. */
104 else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN))
105 return -1; /* Out of range. */
106
107 tmp2 = tmp * multiplier;
108 tmp2 = tmp2 / multiplier;
109 if (tmp != tmp2) {
110 errno = ERANGE;
111 return -1; /* Out of range. */
112 }
113 *size = tmp * multiplier;
114
115 return 0;
116 }
117