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
|
/*
* QNum Module
*
* Copyright (C) 2009 Red Hat Inc.
*
* Authors:
* Luiz Capitulino <lcapitulino@redhat.com>
* Anthony Liguori <aliguori@us.ibm.com>
* Marc-André Lureau <marcandre.lureau@redhat.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*/
#ifndef QNUM_H
#define QNUM_H
#include "qapi/qmp/qobject.h"
typedef enum {
QNUM_I64,
QNUM_U64,
QNUM_DOUBLE
} QNumKind;
/*
* QNum encapsulates how our dialect of JSON fills in the blanks left
* by the JSON specification (RFC 7159) regarding numbers.
*
* Conceptually, we treat number as an abstract type with three
* concrete subtypes: floating-point, signed integer, unsigned
* integer. QNum implements this as a discriminated union of double,
* int64_t, uint64_t.
*
* The JSON parser picks the subtype as follows. If the number has a
* decimal point or an exponent, it is floating-point. Else if it
* fits into int64_t, it's signed integer. Else if it fits into
* uint64_t, it's unsigned integer. Else it's floating-point.
*
* Any number can serve as double: qnum_get_double() converts under
* the hood.
*
* An integer can serve as signed / unsigned integer as long as it is
* in range: qnum_get_try_int() / qnum_get_try_uint() check range and
* convert under the hood.
*/
struct QNum {
QObject base;
QNumKind kind;
union {
int64_t i64;
uint64_t u64;
double dbl;
} u;
};
QNum *qnum_from_int(int64_t value);
QNum *qnum_from_uint(uint64_t value);
QNum *qnum_from_double(double value);
bool qnum_get_try_int(const QNum *qn, int64_t *val);
int64_t qnum_get_int(const QNum *qn);
bool qnum_get_try_uint(const QNum *qn, uint64_t *val);
uint64_t qnum_get_uint(const QNum *qn);
double qnum_get_double(QNum *qn);
char *qnum_to_string(QNum *qn);
QNum *qobject_to_qnum(const QObject *obj);
bool qnum_is_equal(const QObject *x, const QObject *y);
void qnum_destroy_obj(QObject *obj);
#endif /* QNUM_H */
|
