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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* 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.
*/
#include "qemu/osdep.h"
#include "qapi/qmp/qnum.h"
#include "qobject-internal.h"
/**
* qnum_from_int(): Create a new QNum from an int64_t
*
* Return strong reference.
*/
QNum *qnum_from_int(int64_t value)
{
QNum *qn = g_new(QNum, 1);
qobject_init(QOBJECT(qn), QTYPE_QNUM);
qn->kind = QNUM_I64;
qn->u.i64 = value;
return qn;
}
/**
* qnum_from_uint(): Create a new QNum from an uint64_t
*
* Return strong reference.
*/
QNum *qnum_from_uint(uint64_t value)
{
QNum *qn = g_new(QNum, 1);
qobject_init(QOBJECT(qn), QTYPE_QNUM);
qn->kind = QNUM_U64;
qn->u.u64 = value;
return qn;
}
/**
* qnum_from_double(): Create a new QNum from a double
*
* Return strong reference.
*/
QNum *qnum_from_double(double value)
{
QNum *qn = g_new(QNum, 1);
qobject_init(QOBJECT(qn), QTYPE_QNUM);
qn->kind = QNUM_DOUBLE;
qn->u.dbl = value;
return qn;
}
/**
* qnum_get_try_int(): Get an integer representation of the number
*
* Return true on success.
*/
bool qnum_get_try_int(const QNum *qn, int64_t *val)
{
switch (qn->kind) {
case QNUM_I64:
*val = qn->u.i64;
return true;
case QNUM_U64:
if (qn->u.u64 > INT64_MAX) {
return false;
}
*val = qn->u.u64;
return true;
case QNUM_DOUBLE:
return false;
}
assert(0);
return false;
}
/**
* qnum_get_int(): Get an integer representation of the number
*
* assert() on failure.
*/
int64_t qnum_get_int(const QNum *qn)
{
int64_t val;
bool success = qnum_get_try_int(qn, &val);
assert(success);
return val;
}
/**
* qnum_get_uint(): Get an unsigned integer from the number
*
* Return true on success.
*/
bool qnum_get_try_uint(const QNum *qn, uint64_t *val)
{
switch (qn->kind) {
case QNUM_I64:
if (qn->u.i64 < 0) {
return false;
}
*val = qn->u.i64;
return true;
case QNUM_U64:
*val = qn->u.u64;
return true;
case QNUM_DOUBLE:
return false;
}
assert(0);
return false;
}
/**
* qnum_get_uint(): Get an unsigned integer from the number
*
* assert() on failure.
*/
uint64_t qnum_get_uint(const QNum *qn)
{
uint64_t val;
bool success = qnum_get_try_uint(qn, &val);
assert(success);
return val;
}
/**
* qnum_get_double(): Get a float representation of the number
*
* qnum_get_double() loses precision for integers beyond 53 bits.
*/
double qnum_get_double(QNum *qn)
{
switch (qn->kind) {
case QNUM_I64:
return qn->u.i64;
case QNUM_U64:
return qn->u.u64;
case QNUM_DOUBLE:
return qn->u.dbl;
}
assert(0);
return 0.0;
}
char *qnum_to_string(QNum *qn)
{
switch (qn->kind) {
case QNUM_I64:
return g_strdup_printf("%" PRId64, qn->u.i64);
case QNUM_U64:
return g_strdup_printf("%" PRIu64, qn->u.u64);
case QNUM_DOUBLE:
/* 17 digits suffice for IEEE double */
return g_strdup_printf("%.17g", qn->u.dbl);
}
assert(0);
return NULL;
}
/**
* qnum_is_equal(): Test whether the two QNums are equal
*
* Negative integers are never considered equal to unsigned integers,
* but positive integers in the range [0, INT64_MAX] are considered
* equal independently of whether the QNum's kind is i64 or u64.
*
* Doubles are never considered equal to integers.
*/
bool qnum_is_equal(const QObject *x, const QObject *y)
{
QNum *num_x = qobject_to(QNum, x);
QNum *num_y = qobject_to(QNum, y);
switch (num_x->kind) {
case QNUM_I64:
switch (num_y->kind) {
case QNUM_I64:
/* Comparison in native int64_t type */
return num_x->u.i64 == num_y->u.i64;
case QNUM_U64:
/* Implicit conversion of x to uin64_t, so we have to
* check its sign before */
return num_x->u.i64 >= 0 && num_x->u.i64 == num_y->u.u64;
case QNUM_DOUBLE:
return false;
}
abort();
case QNUM_U64:
switch (num_y->kind) {
case QNUM_I64:
return qnum_is_equal(y, x);
case QNUM_U64:
/* Comparison in native uint64_t type */
return num_x->u.u64 == num_y->u.u64;
case QNUM_DOUBLE:
return false;
}
abort();
case QNUM_DOUBLE:
switch (num_y->kind) {
case QNUM_I64:
case QNUM_U64:
return false;
case QNUM_DOUBLE:
/* Comparison in native double type */
return num_x->u.dbl == num_y->u.dbl;
}
abort();
}
abort();
}
/**
* qnum_destroy_obj(): Free all memory allocated by a
* QNum object
*/
void qnum_destroy_obj(QObject *obj)
{
assert(obj != NULL);
g_free(qobject_to(QNum, obj));
}
|
