s390x/sclpconsole-lm: Fix hanging SCLP line mode console
[qemu.git] / qobject / qjson.c
1 /*
2 * QObject JSON integration
3 *
4 * Copyright IBM, Corp. 2009
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
10 * See the COPYING.LIB file in the top-level directory.
11 *
12 */
13
14 #include "qapi/qmp/json-lexer.h"
15 #include "qapi/qmp/json-parser.h"
16 #include "qapi/qmp/json-streamer.h"
17 #include "qapi/qmp/qjson.h"
18 #include "qapi/qmp/qint.h"
19 #include "qapi/qmp/qlist.h"
20 #include "qapi/qmp/qbool.h"
21 #include "qapi/qmp/qfloat.h"
22 #include "qapi/qmp/qdict.h"
23
24 typedef struct JSONParsingState
25 {
26 JSONMessageParser parser;
27 va_list *ap;
28 QObject *result;
29 } JSONParsingState;
30
31 static void parse_json(JSONMessageParser *parser, QList *tokens)
32 {
33 JSONParsingState *s = container_of(parser, JSONParsingState, parser);
34 s->result = json_parser_parse(tokens, s->ap);
35 }
36
37 QObject *qobject_from_jsonv(const char *string, va_list *ap)
38 {
39 JSONParsingState state = {};
40
41 state.ap = ap;
42
43 json_message_parser_init(&state.parser, parse_json);
44 json_message_parser_feed(&state.parser, string, strlen(string));
45 json_message_parser_flush(&state.parser);
46 json_message_parser_destroy(&state.parser);
47
48 return state.result;
49 }
50
51 QObject *qobject_from_json(const char *string)
52 {
53 return qobject_from_jsonv(string, NULL);
54 }
55
56 /*
57 * IMPORTANT: This function aborts on error, thus it must not
58 * be used with untrusted arguments.
59 */
60 QObject *qobject_from_jsonf(const char *string, ...)
61 {
62 QObject *obj;
63 va_list ap;
64
65 va_start(ap, string);
66 obj = qobject_from_jsonv(string, &ap);
67 va_end(ap);
68
69 assert(obj != NULL);
70 return obj;
71 }
72
73 typedef struct ToJsonIterState
74 {
75 int indent;
76 int pretty;
77 int count;
78 QString *str;
79 } ToJsonIterState;
80
81 static void to_json(const QObject *obj, QString *str, int pretty, int indent);
82
83 static void to_json_dict_iter(const char *key, QObject *obj, void *opaque)
84 {
85 ToJsonIterState *s = opaque;
86 QString *qkey;
87 int j;
88
89 if (s->count)
90 qstring_append(s->str, ", ");
91
92 if (s->pretty) {
93 qstring_append(s->str, "\n");
94 for (j = 0 ; j < s->indent ; j++)
95 qstring_append(s->str, " ");
96 }
97
98 qkey = qstring_from_str(key);
99 to_json(QOBJECT(qkey), s->str, s->pretty, s->indent);
100 QDECREF(qkey);
101
102 qstring_append(s->str, ": ");
103 to_json(obj, s->str, s->pretty, s->indent);
104 s->count++;
105 }
106
107 static void to_json_list_iter(QObject *obj, void *opaque)
108 {
109 ToJsonIterState *s = opaque;
110 int j;
111
112 if (s->count)
113 qstring_append(s->str, ", ");
114
115 if (s->pretty) {
116 qstring_append(s->str, "\n");
117 for (j = 0 ; j < s->indent ; j++)
118 qstring_append(s->str, " ");
119 }
120
121 to_json(obj, s->str, s->pretty, s->indent);
122 s->count++;
123 }
124
125 static void to_json(const QObject *obj, QString *str, int pretty, int indent)
126 {
127 switch (qobject_type(obj)) {
128 case QTYPE_QINT: {
129 QInt *val = qobject_to_qint(obj);
130 char buffer[1024];
131
132 snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val));
133 qstring_append(str, buffer);
134 break;
135 }
136 case QTYPE_QSTRING: {
137 QString *val = qobject_to_qstring(obj);
138 const char *ptr;
139 int cp;
140 char buf[16];
141 char *end;
142
143 ptr = qstring_get_str(val);
144 qstring_append(str, "\"");
145
146 for (; *ptr; ptr = end) {
147 cp = mod_utf8_codepoint(ptr, 6, &end);
148 switch (cp) {
149 case '\"':
150 qstring_append(str, "\\\"");
151 break;
152 case '\\':
153 qstring_append(str, "\\\\");
154 break;
155 case '\b':
156 qstring_append(str, "\\b");
157 break;
158 case '\f':
159 qstring_append(str, "\\f");
160 break;
161 case '\n':
162 qstring_append(str, "\\n");
163 break;
164 case '\r':
165 qstring_append(str, "\\r");
166 break;
167 case '\t':
168 qstring_append(str, "\\t");
169 break;
170 default:
171 if (cp < 0) {
172 cp = 0xFFFD; /* replacement character */
173 }
174 if (cp > 0xFFFF) {
175 /* beyond BMP; need a surrogate pair */
176 snprintf(buf, sizeof(buf), "\\u%04X\\u%04X",
177 0xD800 + ((cp - 0x10000) >> 10),
178 0xDC00 + ((cp - 0x10000) & 0x3FF));
179 } else if (cp < 0x20 || cp >= 0x7F) {
180 snprintf(buf, sizeof(buf), "\\u%04X", cp);
181 } else {
182 buf[0] = cp;
183 buf[1] = 0;
184 }
185 qstring_append(str, buf);
186 }
187 };
188
189 qstring_append(str, "\"");
190 break;
191 }
192 case QTYPE_QDICT: {
193 ToJsonIterState s;
194 QDict *val = qobject_to_qdict(obj);
195
196 s.count = 0;
197 s.str = str;
198 s.indent = indent + 1;
199 s.pretty = pretty;
200 qstring_append(str, "{");
201 qdict_iter(val, to_json_dict_iter, &s);
202 if (pretty) {
203 int j;
204 qstring_append(str, "\n");
205 for (j = 0 ; j < indent ; j++)
206 qstring_append(str, " ");
207 }
208 qstring_append(str, "}");
209 break;
210 }
211 case QTYPE_QLIST: {
212 ToJsonIterState s;
213 QList *val = qobject_to_qlist(obj);
214
215 s.count = 0;
216 s.str = str;
217 s.indent = indent + 1;
218 s.pretty = pretty;
219 qstring_append(str, "[");
220 qlist_iter(val, (void *)to_json_list_iter, &s);
221 if (pretty) {
222 int j;
223 qstring_append(str, "\n");
224 for (j = 0 ; j < indent ; j++)
225 qstring_append(str, " ");
226 }
227 qstring_append(str, "]");
228 break;
229 }
230 case QTYPE_QFLOAT: {
231 QFloat *val = qobject_to_qfloat(obj);
232 char buffer[1024];
233 int len;
234
235 len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val));
236 while (len > 0 && buffer[len - 1] == '0') {
237 len--;
238 }
239
240 if (len && buffer[len - 1] == '.') {
241 buffer[len - 1] = 0;
242 } else {
243 buffer[len] = 0;
244 }
245
246 qstring_append(str, buffer);
247 break;
248 }
249 case QTYPE_QBOOL: {
250 QBool *val = qobject_to_qbool(obj);
251
252 if (qbool_get_int(val)) {
253 qstring_append(str, "true");
254 } else {
255 qstring_append(str, "false");
256 }
257 break;
258 }
259 case QTYPE_QERROR:
260 /* XXX: should QError be emitted? */
261 case QTYPE_NONE:
262 break;
263 case QTYPE_MAX:
264 abort();
265 }
266 }
267
268 QString *qobject_to_json(const QObject *obj)
269 {
270 QString *str = qstring_new();
271
272 to_json(obj, str, 0, 0);
273
274 return str;
275 }
276
277 QString *qobject_to_json_pretty(const QObject *obj)
278 {
279 QString *str = qstring_new();
280
281 to_json(obj, str, 1, 0);
282
283 return str;
284 }