Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / qapi / string-output-visitor.c
1 /*
2 * String printing Visitor
3 *
4 * Copyright Red Hat, Inc. 2012
5 *
6 * Author: Paolo Bonzini <pbonzini@redhat.com>
7 *
8 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
9 * See the COPYING.LIB file in the top-level directory.
10 *
11 */
12
13 #include "qemu-common.h"
14 #include "qapi/string-output-visitor.h"
15 #include "qapi/visitor-impl.h"
16 #include "qapi/qmp/qerror.h"
17 #include "qemu/host-utils.h"
18 #include <math.h>
19
20 struct StringOutputVisitor
21 {
22 Visitor visitor;
23 bool human;
24 char *string;
25 };
26
27 static void string_output_set(StringOutputVisitor *sov, char *string)
28 {
29 g_free(sov->string);
30 sov->string = string;
31 }
32
33 static void print_type_int(Visitor *v, int64_t *obj, const char *name,
34 Error **errp)
35 {
36 StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
37 char *out;
38
39 if (sov->human) {
40 out = g_strdup_printf("%lld (%#llx)", (long long) *obj, (long long) *obj);
41 } else {
42 out = g_strdup_printf("%lld", (long long) *obj);
43 }
44 string_output_set(sov, out);
45 }
46
47 static void print_type_size(Visitor *v, uint64_t *obj, const char *name,
48 Error **errp)
49 {
50 StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
51 static const char suffixes[] = { 'B', 'K', 'M', 'G', 'T', 'P', 'E' };
52 uint64_t div, val;
53 char *out;
54 int i;
55
56 if (!sov->human) {
57 out = g_strdup_printf("%"PRIu64, *obj);
58 string_output_set(sov, out);
59 return;
60 }
61
62 val = *obj;
63
64 /* The exponent (returned in i) minus one gives us
65 * floor(log2(val * 1024 / 1000). The correction makes us
66 * switch to the higher power when the integer part is >= 1000.
67 */
68 frexp(val / (1000.0 / 1024.0), &i);
69 i = (i - 1) / 10;
70 assert(i < ARRAY_SIZE(suffixes));
71 div = 1ULL << (i * 10);
72
73 out = g_strdup_printf("%"PRIu64" (%0.3g %c%s)", val,
74 (double)val/div, suffixes[i], i ? "iB" : "");
75 string_output_set(sov, out);
76 }
77
78 static void print_type_bool(Visitor *v, bool *obj, const char *name,
79 Error **errp)
80 {
81 StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
82 string_output_set(sov, g_strdup(*obj ? "true" : "false"));
83 }
84
85 static void print_type_str(Visitor *v, char **obj, const char *name,
86 Error **errp)
87 {
88 StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
89 char *out;
90
91 if (sov->human) {
92 out = *obj ? g_strdup_printf("\"%s\"", *obj) : g_strdup("<null>");
93 } else {
94 out = g_strdup(*obj ? *obj : "");
95 }
96 string_output_set(sov, out);
97 }
98
99 static void print_type_number(Visitor *v, double *obj, const char *name,
100 Error **errp)
101 {
102 StringOutputVisitor *sov = DO_UPCAST(StringOutputVisitor, visitor, v);
103 string_output_set(sov, g_strdup_printf("%f", *obj));
104 }
105
106 char *string_output_get_string(StringOutputVisitor *sov)
107 {
108 char *string = sov->string;
109 sov->string = NULL;
110 return string;
111 }
112
113 Visitor *string_output_get_visitor(StringOutputVisitor *sov)
114 {
115 return &sov->visitor;
116 }
117
118 void string_output_visitor_cleanup(StringOutputVisitor *sov)
119 {
120 g_free(sov->string);
121 g_free(sov);
122 }
123
124 StringOutputVisitor *string_output_visitor_new(bool human)
125 {
126 StringOutputVisitor *v;
127
128 v = g_malloc0(sizeof(*v));
129
130 v->human = human;
131 v->visitor.type_enum = output_type_enum;
132 v->visitor.type_int = print_type_int;
133 v->visitor.type_size = print_type_size;
134 v->visitor.type_bool = print_type_bool;
135 v->visitor.type_str = print_type_str;
136 v->visitor.type_number = print_type_number;
137
138 return v;
139 }