qapi/string-input-visitor.c

   1 /*
   2  * String parsing visitor
   3  *
   4  * Copyright Red Hat, Inc. 2012-2016
   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/osdep.h"
  14 #include "qemu-common.h"
  15 #include "qapi/string-input-visitor.h"
  16 #include "qapi/visitor-impl.h"
  17 #include "qapi/qmp/qerror.h"
  18 #include "qemu/option.h"
  19 #include "qemu/queue.h"
  20 #include "qemu/range.h"
  21
  22
  23 struct StringInputVisitor
  24 {
  25     Visitor visitor;
  26
  27     bool head;
  28
  29     GList *ranges;
  30     GList *cur_range;
  31     int64_t cur;
  32
  33     const char *string;
  34 };
  35
  36 static StringInputVisitor *to_siv(Visitor *v)
  37 {
  38     return container_of(v, StringInputVisitor, visitor);
  39 }
  40
  41 static void free_range(void *range, void *dummy)
  42 {
  43     g_free(range);
  44 }
  45
  46 static void parse_str(StringInputVisitor *siv, Error **errp)
  47 {
  48     char *str = (char *) siv->string;
  49     long long start, end;
  50     Range *cur;
  51     char *endptr;
  52
  53     if (siv->ranges) {
  54         return;
  55     }
  56
  57     do {
  58         errno = 0;
  59         start = strtoll(str, &endptr, 0);
  60         if (errno == 0 && endptr > str) {
  61             if (*endptr == '\0') {
  62                 cur = g_malloc0(sizeof(*cur));
  63                 cur->begin = start;
  64                 cur->end = start + 1;
  65                 siv->ranges = g_list_insert_sorted_merged(siv->ranges, cur,
  66                                                           range_compare);
  67                 cur = NULL;
  68                 str = NULL;
  69             } else if (*endptr == '-') {
  70                 str = endptr + 1;
  71                 errno = 0;
  72                 end = strtoll(str, &endptr, 0);
  73                 if (errno == 0 && endptr > str && start <= end &&
  74                     (start > INT64_MAX - 65536 ||
  75                      end < start + 65536)) {
  76                     if (*endptr == '\0') {
  77                         cur = g_malloc0(sizeof(*cur));
  78                         cur->begin = start;
  79                         cur->end = end + 1;
  80                         siv->ranges =
  81                             g_list_insert_sorted_merged(siv->ranges,
  82                                                         cur,
  83                                                         range_compare);
  84                         cur = NULL;
  85                         str = NULL;
  86                     } else if (*endptr == ',') {
  87                         str = endptr + 1;
  88                         cur = g_malloc0(sizeof(*cur));
  89                         cur->begin = start;
  90                         cur->end = end + 1;
  91                         siv->ranges =
  92                             g_list_insert_sorted_merged(siv->ranges,
  93                                                         cur,
  94                                                         range_compare);
  95                         cur = NULL;
  96                     } else {
  97                         goto error;
  98                     }
  99                 } else {
 100                     goto error;
 101                 }
 102             } else if (*endptr == ',') {
 103                 str = endptr + 1;
 104                 cur = g_malloc0(sizeof(*cur));
 105                 cur->begin = start;
 106                 cur->end = start + 1;
 107                 siv->ranges = g_list_insert_sorted_merged(siv->ranges,
 108                                                           cur,
 109                                                           range_compare);
 110                 cur = NULL;
 111             } else {
 112                 goto error;
 113             }
 114         } else {
 115             goto error;
 116         }
 117     } while (str);
 118
 119     return;
 120 error:
 121     g_list_foreach(siv->ranges, free_range, NULL);
 122     g_list_free(siv->ranges);
 123     siv->ranges = NULL;
 124 }
 125
 126 static void
 127 start_list(Visitor *v, const char *name, Error **errp)
 128 {
 129     StringInputVisitor *siv = to_siv(v);
 130
 131     parse_str(siv, errp);
 132
 133     siv->cur_range = g_list_first(siv->ranges);
 134     if (siv->cur_range) {
 135         Range *r = siv->cur_range->data;
 136         if (r) {
 137             siv->cur = r->begin;
 138         }
 139     }
 140 }
 141
 142 static GenericList *next_list(Visitor *v, GenericList **list, size_t size)
 143 {
 144     StringInputVisitor *siv = to_siv(v);
 145     GenericList **link;
 146     Range *r;
 147
 148     if (!siv->ranges || !siv->cur_range) {
 149         return NULL;
 150     }
 151
 152     r = siv->cur_range->data;
 153     if (!r) {
 154         return NULL;
 155     }
 156
 157     if (siv->cur < r->begin || siv->cur >= r->end) {
 158         siv->cur_range = g_list_next(siv->cur_range);
 159         if (!siv->cur_range) {
 160             return NULL;
 161         }
 162         r = siv->cur_range->data;
 163         if (!r) {
 164             return NULL;
 165         }
 166         siv->cur = r->begin;
 167     }
 168
 169     if (siv->head) {
 170         link = list;
 171         siv->head = false;
 172     } else {
 173         link = &(*list)->next;
 174     }
 175
 176     *link = g_malloc0(size);
 177     return *link;
 178 }
 179
 180 static void end_list(Visitor *v)
 181 {
 182     StringInputVisitor *siv = to_siv(v);
 183     siv->head = true;
 184 }
 185
 186 static void parse_type_int64(Visitor *v, const char *name, int64_t *obj,
 187                              Error **errp)
 188 {
 189     StringInputVisitor *siv = to_siv(v);
 190
 191     if (!siv->string) {
 192         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 193                    "integer");
 194         return;
 195     }
 196
 197     parse_str(siv, errp);
 198
 199     if (!siv->ranges) {
 200         goto error;
 201     }
 202
 203     if (!siv->cur_range) {
 204         Range *r;
 205
 206         siv->cur_range = g_list_first(siv->ranges);
 207         if (!siv->cur_range) {
 208             goto error;
 209         }
 210
 211         r = siv->cur_range->data;
 212         if (!r) {
 213             goto error;
 214         }
 215
 216         siv->cur = r->begin;
 217     }
 218
 219     *obj = siv->cur;
 220     siv->cur++;
 221     return;
 222
 223 error:
 224     error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
 225                "an int64 value or range");
 226 }
 227
 228 static void parse_type_uint64(Visitor *v, const char *name, uint64_t *obj,
 229                               Error **errp)
 230 {
 231     /* FIXME: parse_type_int64 mishandles values over INT64_MAX */
 232     int64_t i;
 233     Error *err = NULL;
 234     parse_type_int64(v, name, &i, &err);
 235     if (err) {
 236         error_propagate(errp, err);
 237     } else {
 238         *obj = i;
 239     }
 240 }
 241
 242 static void parse_type_size(Visitor *v, const char *name, uint64_t *obj,
 243                             Error **errp)
 244 {
 245     StringInputVisitor *siv = to_siv(v);
 246     Error *err = NULL;
 247     uint64_t val;
 248
 249     if (siv->string) {
 250         parse_option_size(name, siv->string, &val, &err);
 251     } else {
 252         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 253                    "size");
 254         return;
 255     }
 256     if (err) {
 257         error_propagate(errp, err);
 258         return;
 259     }
 260
 261     *obj = val;
 262 }
 263
 264 static void parse_type_bool(Visitor *v, const char *name, bool *obj,
 265                             Error **errp)
 266 {
 267     StringInputVisitor *siv = to_siv(v);
 268
 269     if (siv->string) {
 270         if (!strcasecmp(siv->string, "on") ||
 271             !strcasecmp(siv->string, "yes") ||
 272             !strcasecmp(siv->string, "true")) {
 273             *obj = true;
 274             return;
 275         }
 276         if (!strcasecmp(siv->string, "off") ||
 277             !strcasecmp(siv->string, "no") ||
 278             !strcasecmp(siv->string, "false")) {
 279             *obj = false;
 280             return;
 281         }
 282     }
 283
 284     error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 285                "boolean");
 286 }
 287
 288 static void parse_type_str(Visitor *v, const char *name, char **obj,
 289                            Error **errp)
 290 {
 291     StringInputVisitor *siv = to_siv(v);
 292     if (siv->string) {
 293         *obj = g_strdup(siv->string);
 294     } else {
 295         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 296                    "string");
 297     }
 298 }
 299
 300 static void parse_type_number(Visitor *v, const char *name, double *obj,
 301                               Error **errp)
 302 {
 303     StringInputVisitor *siv = to_siv(v);
 304     char *endp = (char *) siv->string;
 305     double val;
 306
 307     errno = 0;
 308     if (siv->string) {
 309         val = strtod(siv->string, &endp);
 310     }
 311     if (!siv->string || errno || endp == siv->string || *endp) {
 312         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 313                    "number");
 314         return;
 315     }
 316
 317     *obj = val;
 318 }
 319
 320 static void parse_optional(Visitor *v, const char *name, bool *present)
 321 {
 322     StringInputVisitor *siv = to_siv(v);
 323
 324     if (!siv->string) {
 325         *present = false;
 326         return;
 327     }
 328
 329     *present = true;
 330 }
 331
 332 Visitor *string_input_get_visitor(StringInputVisitor *v)
 333 {
 334     return &v->visitor;
 335 }
 336
 337 void string_input_visitor_cleanup(StringInputVisitor *v)
 338 {
 339     g_list_foreach(v->ranges, free_range, NULL);
 340     g_list_free(v->ranges);
 341     g_free(v);
 342 }
 343
 344 StringInputVisitor *string_input_visitor_new(const char *str)
 345 {
 346     StringInputVisitor *v;
 347
 348     v = g_malloc0(sizeof(*v));
 349
 350     v->visitor.type_enum = input_type_enum;
 351     v->visitor.type_int64 = parse_type_int64;
 352     v->visitor.type_uint64 = parse_type_uint64;
 353     v->visitor.type_size = parse_type_size;
 354     v->visitor.type_bool = parse_type_bool;
 355     v->visitor.type_str = parse_type_str;
 356     v->visitor.type_number = parse_type_number;
 357     v->visitor.start_list = start_list;
 358     v->visitor.next_list = next_list;
 359     v->visitor.end_list = end_list;
 360     v->visitor.optional = parse_optional;
 361
 362     v->string = str;
 363     v->head = true;
 364     return v;
 365 }