1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef NBDKIT_HUMAN_SIZE_H
#define NBDKIT_HUMAN_SIZE_H
#include <stdint.h>
#include <inttypes.h>
#include <errno.h>
/* Attempt to parse a string with a possible scaling suffix, such as
* "2M". Disk sizes cannot usefully exceed off_t (which is signed)
* and cannot be negative. If rest is not NULL, the number being
* parsed is treated as a substring within a larger input; if a value
* was parsed, *rest is set to the first unparsed byte of str. If
* rest is NULL, any trailing garbage is treated as an error.
*
* On error, returns -1 and sets *error and *pstr. You can form a
* final error message by appending "<error>: <pstr>".
*/
static inline int64_t __attribute__ ((__nonnull__ (1, 3, 4)))
human_size_parse_substr (const char *str, char **rest,
const char **error, const char **pstr)
{
int64_t size;
char *end;
uint64_t scale = 1;
/* XXX Should we also parse things like '1.5M'? */
/* XXX Should we allow hex? If so, hex cannot use scaling suffixes,
* because some of them are valid hex digits.
*/
if (rest)
*rest = NULL;
*error = *pstr = NULL;
errno = 0;
size = strtoimax (str, &end, 10);
if (str == end) {
*error = "could not parse size string";
*pstr = str;
return -1;
}
if (size < 0) {
*error = "size cannot be negative";
*pstr = str;
return -1;
}
if (errno) {
*error = "size exceeds maximum value";
*pstr = str;
return -1;
}
switch (*end) {
/* No suffix */
case '\0':
/* Safe, since we already filtered out empty string */
break;
/* Powers of 1024 */
case 'e': case 'E':
scale *= 1024;
/* fallthru */
case 'p': case 'P':
scale *= 1024;
/* fallthru */
case 't': case 'T':
scale *= 1024;
/* fallthru */
case 'g': case 'G':
scale *= 1024;
/* fallthru */
case 'm': case 'M':
scale *= 1024;
/* fallthru */
case 'k': case 'K':
scale *= 1024;
/* fallthru */
case 'b': case 'B':
end++;
break;
/* "sectors", ie. units of 512 bytes, even if that's not the real
* sector size
*/
case 's': case 'S':
scale = 512;
end++;
break;
}
if (INT64_MAX / scale < size) {
*error = "could not parse size: size * scale overflows";
*pstr = str;
return -1;
}
/* XXX Maybe we should support 'MiB' as a synonym for 'M'; and 'MB'
* for powers of 1000, for similarity to GNU tools. But for now,
* anything beyond 'M' is dropped.
*/
if (rest)
*rest = end;
else if (*end) {
*error = "could not parse size: unknown suffix";
*pstr = end;
return -1;
}
return size * scale;
}
/* Attempt to parse a string with a possible scaling suffix, such as
* "2M". Disk sizes cannot usefully exceed off_t (which is signed)
* and cannot be negative. str must not have any trailing garbage.
*
* On error, returns -1 and sets *error and *pstr. You can form a
* final error message by appending "<error>: <pstr>".
*/
static inline int64_t __attribute__ ((__nonnull__ (1, 2, 3)))
human_size_parse (const char *str,
const char **error, const char **pstr)
{
return human_size_parse_substr (str, NULL, error, pstr);
}
#endif /* NBDKIT_HUMAN_SIZE_H */
|
