qapi/qmp-input-visitor.c

   1 /*
   2  * Input Visitor
   3  *
   4  * Copyright IBM, Corp. 2011
   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 "qmp-input-visitor.h"
  15 #include "qemu-queue.h"
  16 #include "qemu-common.h"
  17 #include "qemu-objects.h"
  18 #include "qerror.h"
  19
  20 #define QIV_STACK_SIZE 1024
  21
  22 typedef struct StackObject
  23 {
  24     const QObject *obj;
  25     const  QListEntry *entry;
  26 } StackObject;
  27
  28 struct QmpInputVisitor
  29 {
  30     Visitor visitor;
  31     QObject *obj;
  32     StackObject stack[QIV_STACK_SIZE];
  33     int nb_stack;
  34 };
  35
  36 static QmpInputVisitor *to_qiv(Visitor *v)
  37 {
  38     return container_of(v, QmpInputVisitor, visitor);
  39 }
  40
  41 static const QObject *qmp_input_get_object(QmpInputVisitor *qiv,
  42                                            const char *name)
  43 {
  44     const QObject *qobj;
  45
  46     if (qiv->nb_stack == 0) {
  47         qobj = qiv->obj;
  48     } else {
  49         qobj = qiv->stack[qiv->nb_stack - 1].obj;
  50     }
  51
  52     if (name && qobject_type(qobj) == QTYPE_QDICT) {
  53         return qdict_get(qobject_to_qdict(qobj), name);
  54     } else if (qiv->nb_stack > 0 && qobject_type(qobj) == QTYPE_QLIST) {
  55         return qlist_entry_obj(qiv->stack[qiv->nb_stack - 1].entry);
  56     }
  57
  58     return qobj;
  59 }
  60
  61 static void qmp_input_push(QmpInputVisitor *qiv, const QObject *obj, Error **errp)
  62 {
  63     qiv->stack[qiv->nb_stack].obj = obj;
  64     if (qobject_type(obj) == QTYPE_QLIST) {
  65         qiv->stack[qiv->nb_stack].entry = qlist_first(qobject_to_qlist(obj));
  66     }
  67     qiv->nb_stack++;
  68
  69     if (qiv->nb_stack >= QIV_STACK_SIZE) {
  70         error_set(errp, QERR_BUFFER_OVERRUN);
  71         return;
  72     }
  73 }
  74
  75 static void qmp_input_pop(QmpInputVisitor *qiv, Error **errp)
  76 {
  77     qiv->nb_stack--;
  78     if (qiv->nb_stack < 0) {
  79         error_set(errp, QERR_BUFFER_OVERRUN);
  80         return;
  81     }
  82 }
  83
  84 static void qmp_input_start_struct(Visitor *v, void **obj, const char *kind,
  85                                    const char *name, size_t size, Error **errp)
  86 {
  87     QmpInputVisitor *qiv = to_qiv(v);
  88     const QObject *qobj = qmp_input_get_object(qiv, name);
  89
  90     if (!qobj || qobject_type(qobj) != QTYPE_QDICT) {
  91         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
  92                   "QDict");
  93         return;
  94     }
  95
  96     qmp_input_push(qiv, qobj, errp);
  97     if (error_is_set(errp)) {
  98         return;
  99     }
 100
 101     if (obj) {
 102         *obj = qemu_mallocz(size);
 103     }
 104 }
 105
 106 static void qmp_input_end_struct(Visitor *v, Error **errp)
 107 {
 108     QmpInputVisitor *qiv = to_qiv(v);
 109
 110     qmp_input_pop(qiv, errp);
 111 }
 112
 113 static void qmp_input_start_list(Visitor *v, const char *name, Error **errp)
 114 {
 115     QmpInputVisitor *qiv = to_qiv(v);
 116     const QObject *qobj = qmp_input_get_object(qiv, name);
 117
 118     if (!qobj || qobject_type(qobj) != QTYPE_QLIST) {
 119         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 120                   "list");
 121         return;
 122     }
 123
 124     qmp_input_push(qiv, qobj, errp);
 125 }
 126
 127 static GenericList *qmp_input_next_list(Visitor *v, GenericList **list,
 128                                         Error **errp)
 129 {
 130     QmpInputVisitor *qiv = to_qiv(v);
 131     GenericList *entry;
 132     StackObject *so = &qiv->stack[qiv->nb_stack - 1];
 133
 134     if (so->entry == NULL) {
 135         return NULL;
 136     }
 137
 138     entry = qemu_mallocz(sizeof(*entry));
 139     if (*list) {
 140         so->entry = qlist_next(so->entry);
 141         if (so->entry == NULL) {
 142             qemu_free(entry);
 143             return NULL;
 144         }
 145         (*list)->next = entry;
 146     }
 147     *list = entry;
 148
 149
 150     return entry;
 151 }
 152
 153 static void qmp_input_end_list(Visitor *v, Error **errp)
 154 {
 155     QmpInputVisitor *qiv = to_qiv(v);
 156
 157     qmp_input_pop(qiv, errp);
 158 }
 159
 160 static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name,
 161                                Error **errp)
 162 {
 163     QmpInputVisitor *qiv = to_qiv(v);
 164     const QObject *qobj = qmp_input_get_object(qiv, name);
 165
 166     if (!qobj || qobject_type(qobj) != QTYPE_QINT) {
 167         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 168                   "integer");
 169         return;
 170     }
 171
 172     *obj = qint_get_int(qobject_to_qint(qobj));
 173 }
 174
 175 static void qmp_input_type_bool(Visitor *v, bool *obj, const char *name,
 176                                 Error **errp)
 177 {
 178     QmpInputVisitor *qiv = to_qiv(v);
 179     const QObject *qobj = qmp_input_get_object(qiv, name);
 180
 181     if (!qobj || qobject_type(qobj) != QTYPE_QBOOL) {
 182         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 183                   "boolean");
 184         return;
 185     }
 186
 187     *obj = qbool_get_int(qobject_to_qbool(qobj));
 188 }
 189
 190 static void qmp_input_type_str(Visitor *v, char **obj, const char *name,
 191                                Error **errp)
 192 {
 193     QmpInputVisitor *qiv = to_qiv(v);
 194     const QObject *qobj = qmp_input_get_object(qiv, name);
 195
 196     if (!qobj || qobject_type(qobj) != QTYPE_QSTRING) {
 197         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 198                   "string");
 199         return;
 200     }
 201
 202     *obj = qemu_strdup(qstring_get_str(qobject_to_qstring(qobj)));
 203 }
 204
 205 static void qmp_input_type_number(Visitor *v, double *obj, const char *name,
 206                                   Error **errp)
 207 {
 208     QmpInputVisitor *qiv = to_qiv(v);
 209     const QObject *qobj = qmp_input_get_object(qiv, name);
 210
 211     if (!qobj || qobject_type(qobj) != QTYPE_QFLOAT) {
 212         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 213                   "double");
 214         return;
 215     }
 216
 217     *obj = qfloat_get_double(qobject_to_qfloat(qobj));
 218 }
 219
 220 static void qmp_input_type_enum(Visitor *v, int *obj, const char *strings[],
 221                                 const char *kind, const char *name,
 222                                 Error **errp)
 223 {
 224     int64_t value = 0;
 225     char *enum_str;
 226
 227     assert(strings);
 228
 229     qmp_input_type_str(v, &enum_str, name, errp);
 230     if (error_is_set(errp)) {
 231         return;
 232     }
 233
 234     while (strings[value] != NULL) {
 235         if (strcmp(strings[value], enum_str) == 0) {
 236             break;
 237         }
 238         value++;
 239     }
 240
 241     if (strings[value] == NULL) {
 242         error_set(errp, QERR_INVALID_PARAMETER, name ? name : "null");
 243         return;
 244     }
 245
 246     *obj = value;
 247 }
 248
 249 static void qmp_input_start_optional(Visitor *v, bool *present,
 250                                      const char *name, Error **errp)
 251 {
 252     QmpInputVisitor *qiv = to_qiv(v);
 253     const QObject *qobj = qmp_input_get_object(qiv, name);
 254
 255     if (!qobj) {
 256         *present = false;
 257         return;
 258     }
 259
 260     *present = true;
 261 }
 262
 263 static void qmp_input_end_optional(Visitor *v, Error **errp)
 264 {
 265 }
 266
 267 Visitor *qmp_input_get_visitor(QmpInputVisitor *v)
 268 {
 269     return &v->visitor;
 270 }
 271
 272 void qmp_input_visitor_cleanup(QmpInputVisitor *v)
 273 {
 274     qobject_decref(v->obj);
 275     qemu_free(v);
 276 }
 277
 278 QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
 279 {
 280     QmpInputVisitor *v;
 281
 282     v = qemu_mallocz(sizeof(*v));
 283
 284     v->visitor.start_struct = qmp_input_start_struct;
 285     v->visitor.end_struct = qmp_input_end_struct;
 286     v->visitor.start_list = qmp_input_start_list;
 287     v->visitor.next_list = qmp_input_next_list;
 288     v->visitor.end_list = qmp_input_end_list;
 289     v->visitor.type_enum = qmp_input_type_enum;
 290     v->visitor.type_int = qmp_input_type_int;
 291     v->visitor.type_bool = qmp_input_type_bool;
 292     v->visitor.type_str = qmp_input_type_str;
 293     v->visitor.type_number = qmp_input_type_number;
 294     v->visitor.start_optional = qmp_input_start_optional;
 295     v->visitor.end_optional = qmp_input_end_optional;
 296
 297     v->obj = obj;
 298     qobject_incref(v->obj);
 299
 300     return v;
 301 }