util/qemu-option.c

   1 /*
   2  * Commandline option parsing functions
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2009 Kevin Wolf <kwolf@redhat.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27
  28 #include "qapi/error.h"
  29 #include "qemu/error-report.h"
  30 #include "qapi/qmp/qbool.h"
  31 #include "qapi/qmp/qdict.h"
  32 #include "qapi/qmp/qnum.h"
  33 #include "qapi/qmp/qstring.h"
  34 #include "qapi/qmp/qerror.h"
  35 #include "qemu/option_int.h"
  36 #include "qemu/cutils.h"
  37 #include "qemu/id.h"
  38 #include "qemu/help_option.h"
  39
  40 /*
  41  * Extracts the name of an option from the parameter string (@p points at the
  42  * first byte of the option name)
  43  *
  44  * The option name is @len characters long and is copied into @option. The
  45  * caller is responsible for free'ing @option when no longer required.
  46  *
  47  * The return value is the position of the delimiter/zero byte after the option
  48  * name in @p.
  49  */
  50 static const char *get_opt_name(const char *p, char **option, size_t len)
  51 {
  52     *option = g_strndup(p, len);
  53     return p + len;
  54 }
  55
  56 /*
  57  * Extracts the value of an option from the parameter string p (p points at the
  58  * first byte of the option value)
  59  *
  60  * This function is comparable to get_opt_name with the difference that the
  61  * delimiter is fixed to be comma which starts a new option. To specify an
  62  * option value that contains commas, double each comma.
  63  */
  64 const char *get_opt_value(const char *p, char **value)
  65 {
  66     size_t capacity = 0, length;
  67     const char *offset;
  68
  69     *value = NULL;
  70     while (1) {
  71         offset = qemu_strchrnul(p, ',');
  72         length = offset - p;
  73         if (*offset != '\0' && *(offset + 1) == ',') {
  74             length++;
  75         }
  76         *value = g_renew(char, *value, capacity + length + 1);
  77         strncpy(*value + capacity, p, length);
  78         (*value)[capacity + length] = '\0';
  79         capacity += length;
  80         if (*offset == '\0' ||
  81             *(offset + 1) != ',') {
  82             break;
  83         }
  84
  85         p += (offset - p) + 2;
  86     }
  87
  88     return offset;
  89 }
  90
  91 static bool parse_option_number(const char *name, const char *value,
  92                                 uint64_t *ret, Error **errp)
  93 {
  94     uint64_t number;
  95     int err;
  96
  97     err = qemu_strtou64(value, NULL, 0, &number);
  98     if (err == -ERANGE) {
  99         error_setg(errp, "Value '%s' is too large for parameter '%s'",
 100                    value, name);
 101         return false;
 102     }
 103     if (err) {
 104         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 105         return false;
 106     }
 107     *ret = number;
 108     return true;
 109 }
 110
 111 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
 112                                             const char *name)
 113 {
 114     int i;
 115
 116     for (i = 0; desc[i].name != NULL; i++) {
 117         if (strcmp(desc[i].name, name) == 0) {
 118             return &desc[i];
 119         }
 120     }
 121
 122     return NULL;
 123 }
 124
 125 static const char *find_default_by_name(QemuOpts *opts, const char *name)
 126 {
 127     const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 128
 129     return desc ? desc->def_value_str : NULL;
 130 }
 131
 132 bool parse_option_size(const char *name, const char *value,
 133                        uint64_t *ret, Error **errp)
 134 {
 135     uint64_t size;
 136     int err;
 137
 138     err = qemu_strtosz(value, NULL, &size);
 139     if (err == -ERANGE) {
 140         error_setg(errp, "Value '%s' is out of range for parameter '%s'",
 141                    value, name);
 142         return false;
 143     }
 144     if (err) {
 145         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
 146                    "a non-negative number below 2^64");
 147         error_append_hint(errp, "Optional suffix k, M, G, T, P or E means"
 148                           " kilo-, mega-, giga-, tera-, peta-\n"
 149                           "and exabytes, respectively.\n");
 150         return false;
 151     }
 152     *ret = size;
 153     return true;
 154 }
 155
 156 static const char *opt_type_to_string(enum QemuOptType type)
 157 {
 158     switch (type) {
 159     case QEMU_OPT_STRING:
 160         return "str";
 161     case QEMU_OPT_BOOL:
 162         return "bool (on/off)";
 163     case QEMU_OPT_NUMBER:
 164         return "num";
 165     case QEMU_OPT_SIZE:
 166         return "size";
 167     }
 168
 169     g_assert_not_reached();
 170 }
 171
 172 /**
 173  * Print the list of options available in the given list.  If
 174  * @print_caption is true, a caption (including the list name, if it
 175  * exists) is printed.  The options itself will be indented, so
 176  * @print_caption should only be set to false if the caller prints its
 177  * own custom caption (so that the indentation makes sense).
 178  */
 179 void qemu_opts_print_help(QemuOptsList *list, bool print_caption)
 180 {
 181     QemuOptDesc *desc;
 182     int i;
 183     GPtrArray *array = g_ptr_array_new();
 184
 185     assert(list);
 186     desc = list->desc;
 187     while (desc && desc->name) {
 188         GString *str = g_string_new(NULL);
 189         g_string_append_printf(str, "  %s=<%s>", desc->name,
 190                                opt_type_to_string(desc->type));
 191         if (desc->help) {
 192             if (str->len < 24) {
 193                 g_string_append_printf(str, "%*s", 24 - (int)str->len, "");
 194             }
 195             g_string_append_printf(str, " - %s", desc->help);
 196         }
 197         g_ptr_array_add(array, g_string_free(str, false));
 198         desc++;
 199     }
 200
 201     g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
 202     if (print_caption && array->len > 0) {
 203         if (list->name) {
 204             printf("%s options:\n", list->name);
 205         } else {
 206             printf("Options:\n");
 207         }
 208     } else if (array->len == 0) {
 209         if (list->name) {
 210             printf("There are no options for %s.\n", list->name);
 211         } else {
 212             printf("No options available.\n");
 213         }
 214     }
 215     for (i = 0; i < array->len; i++) {
 216         printf("%s\n", (char *)array->pdata[i]);
 217     }
 218     g_ptr_array_set_free_func(array, g_free);
 219     g_ptr_array_free(array, true);
 220
 221 }
 222 /* ------------------------------------------------------------------ */
 223
 224 QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 225 {
 226     QemuOpt *opt;
 227
 228     QTAILQ_FOREACH_REVERSE(opt, &opts->head, next) {
 229         if (strcmp(opt->name, name) != 0)
 230             continue;
 231         return opt;
 232     }
 233     return NULL;
 234 }
 235
 236 static void qemu_opt_del(QemuOpt *opt)
 237 {
 238     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 239     g_free(opt->name);
 240     g_free(opt->str);
 241     g_free(opt);
 242 }
 243
 244 /* qemu_opt_set allows many settings for the same option.
 245  * This function deletes all settings for an option.
 246  */
 247 static void qemu_opt_del_all(QemuOpts *opts, const char *name)
 248 {
 249     QemuOpt *opt, *next_opt;
 250
 251     QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next_opt) {
 252         if (!strcmp(opt->name, name)) {
 253             qemu_opt_del(opt);
 254         }
 255     }
 256 }
 257
 258 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 259 {
 260     QemuOpt *opt;
 261
 262     if (opts == NULL) {
 263         return NULL;
 264     }
 265
 266     opt = qemu_opt_find(opts, name);
 267     if (!opt) {
 268         return find_default_by_name(opts, name);
 269     }
 270
 271     return opt->str;
 272 }
 273
 274 void qemu_opt_iter_init(QemuOptsIter *iter, QemuOpts *opts, const char *name)
 275 {
 276     iter->opts = opts;
 277     iter->opt = QTAILQ_FIRST(&opts->head);
 278     iter->name = name;
 279 }
 280
 281 const char *qemu_opt_iter_next(QemuOptsIter *iter)
 282 {
 283     QemuOpt *ret = iter->opt;
 284     if (iter->name) {
 285         while (ret && !g_str_equal(iter->name, ret->name)) {
 286             ret = QTAILQ_NEXT(ret, next);
 287         }
 288     }
 289     iter->opt = ret ? QTAILQ_NEXT(ret, next) : NULL;
 290     return ret ? ret->str : NULL;
 291 }
 292
 293 /* Get a known option (or its default) and remove it from the list
 294  * all in one action. Return a malloced string of the option value.
 295  * Result must be freed by caller with g_free().
 296  */
 297 char *qemu_opt_get_del(QemuOpts *opts, const char *name)
 298 {
 299     QemuOpt *opt;
 300     char *str;
 301
 302     if (opts == NULL) {
 303         return NULL;
 304     }
 305
 306     opt = qemu_opt_find(opts, name);
 307     if (!opt) {
 308         return g_strdup(find_default_by_name(opts, name));
 309     }
 310     str = opt->str;
 311     opt->str = NULL;
 312     qemu_opt_del_all(opts, name);
 313     return str;
 314 }
 315
 316 bool qemu_opt_has_help_opt(QemuOpts *opts)
 317 {
 318     QemuOpt *opt;
 319
 320     QTAILQ_FOREACH_REVERSE(opt, &opts->head, next) {
 321         if (is_help_option(opt->name)) {
 322             return true;
 323         }
 324     }
 325     return false;
 326 }
 327
 328 static bool qemu_opt_get_bool_helper(QemuOpts *opts, const char *name,
 329                                      bool defval, bool del)
 330 {
 331     QemuOpt *opt;
 332     const char *def_val;
 333     bool ret = defval;
 334
 335     if (opts == NULL) {
 336         return ret;
 337     }
 338
 339     opt = qemu_opt_find(opts, name);
 340     if (opt == NULL) {
 341         def_val = find_default_by_name(opts, name);
 342         if (def_val) {
 343             qapi_bool_parse(name, def_val, &ret, &error_abort);
 344         }
 345         return ret;
 346     }
 347     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 348     ret = opt->value.boolean;
 349     if (del) {
 350         qemu_opt_del_all(opts, name);
 351     }
 352     return ret;
 353 }
 354
 355 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 356 {
 357     return qemu_opt_get_bool_helper(opts, name, defval, false);
 358 }
 359
 360 bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval)
 361 {
 362     return qemu_opt_get_bool_helper(opts, name, defval, true);
 363 }
 364
 365 static uint64_t qemu_opt_get_number_helper(QemuOpts *opts, const char *name,
 366                                            uint64_t defval, bool del)
 367 {
 368     QemuOpt *opt;
 369     const char *def_val;
 370     uint64_t ret = defval;
 371
 372     if (opts == NULL) {
 373         return ret;
 374     }
 375
 376     opt = qemu_opt_find(opts, name);
 377     if (opt == NULL) {
 378         def_val = find_default_by_name(opts, name);
 379         if (def_val) {
 380             parse_option_number(name, def_val, &ret, &error_abort);
 381         }
 382         return ret;
 383     }
 384     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 385     ret = opt->value.uint;
 386     if (del) {
 387         qemu_opt_del_all(opts, name);
 388     }
 389     return ret;
 390 }
 391
 392 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 393 {
 394     return qemu_opt_get_number_helper(opts, name, defval, false);
 395 }
 396
 397 uint64_t qemu_opt_get_number_del(QemuOpts *opts, const char *name,
 398                                  uint64_t defval)
 399 {
 400     return qemu_opt_get_number_helper(opts, name, defval, true);
 401 }
 402
 403 static uint64_t qemu_opt_get_size_helper(QemuOpts *opts, const char *name,
 404                                          uint64_t defval, bool del)
 405 {
 406     QemuOpt *opt;
 407     const char *def_val;
 408     uint64_t ret = defval;
 409
 410     if (opts == NULL) {
 411         return ret;
 412     }
 413
 414     opt = qemu_opt_find(opts, name);
 415     if (opt == NULL) {
 416         def_val = find_default_by_name(opts, name);
 417         if (def_val) {
 418             parse_option_size(name, def_val, &ret, &error_abort);
 419         }
 420         return ret;
 421     }
 422     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 423     ret = opt->value.uint;
 424     if (del) {
 425         qemu_opt_del_all(opts, name);
 426     }
 427     return ret;
 428 }
 429
 430 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 431 {
 432     return qemu_opt_get_size_helper(opts, name, defval, false);
 433 }
 434
 435 uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name,
 436                                uint64_t defval)
 437 {
 438     return qemu_opt_get_size_helper(opts, name, defval, true);
 439 }
 440
 441 static bool qemu_opt_parse(QemuOpt *opt, Error **errp)
 442 {
 443     if (opt->desc == NULL)
 444         return true;
 445
 446     switch (opt->desc->type) {
 447     case QEMU_OPT_STRING:
 448         /* nothing */
 449         return true;
 450     case QEMU_OPT_BOOL:
 451         return qapi_bool_parse(opt->name, opt->str, &opt->value.boolean, errp);
 452     case QEMU_OPT_NUMBER:
 453         return parse_option_number(opt->name, opt->str, &opt->value.uint,
 454                                    errp);
 455     case QEMU_OPT_SIZE:
 456         return parse_option_size(opt->name, opt->str, &opt->value.uint,
 457                                  errp);
 458     default:
 459         abort();
 460     }
 461 }
 462
 463 static bool opts_accepts_any(const QemuOptsList *list)
 464 {
 465     return list->desc[0].name == NULL;
 466 }
 467
 468 int qemu_opt_unset(QemuOpts *opts, const char *name)
 469 {
 470     QemuOpt *opt = qemu_opt_find(opts, name);
 471
 472     assert(opts_accepts_any(opts->list));
 473
 474     if (opt == NULL) {
 475         return -1;
 476     } else {
 477         qemu_opt_del(opt);
 478         return 0;
 479     }
 480 }
 481
 482 static QemuOpt *opt_create(QemuOpts *opts, const char *name, char *value)
 483 {
 484     QemuOpt *opt = g_malloc0(sizeof(*opt));
 485
 486     opt->name = g_strdup(name);
 487     opt->str = value;
 488     opt->opts = opts;
 489     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 490
 491     return opt;
 492 }
 493
 494 static bool opt_validate(QemuOpt *opt, Error **errp)
 495 {
 496     const QemuOptDesc *desc;
 497     const QemuOptsList *list = opt->opts->list;
 498
 499     desc = find_desc_by_name(list->desc, opt->name);
 500     if (!desc && !opts_accepts_any(list)) {
 501         error_setg(errp, "Invalid parameter '%s'", opt->name);
 502         return false;
 503     }
 504
 505     opt->desc = desc;
 506     if (!qemu_opt_parse(opt, errp)) {
 507         return false;
 508     }
 509
 510     return true;
 511 }
 512
 513 bool qemu_opt_set(QemuOpts *opts, const char *name, const char *value,
 514                   Error **errp)
 515 {
 516     QemuOpt *opt = opt_create(opts, name, g_strdup(value));
 517
 518     if (!opt_validate(opt, errp)) {
 519         qemu_opt_del(opt);
 520         return false;
 521     }
 522     return true;
 523 }
 524
 525 bool qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val,
 526                        Error **errp)
 527 {
 528     QemuOpt *opt;
 529     const QemuOptDesc *desc;
 530     const QemuOptsList *list = opts->list;
 531
 532     desc = find_desc_by_name(list->desc, name);
 533     if (!desc && !opts_accepts_any(list)) {
 534         error_setg(errp, "Invalid parameter '%s'", name);
 535         return false;
 536     }
 537
 538     opt = g_malloc0(sizeof(*opt));
 539     opt->name = g_strdup(name);
 540     opt->opts = opts;
 541     opt->desc = desc;
 542     opt->value.boolean = !!val;
 543     opt->str = g_strdup(val ? "on" : "off");
 544     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 545     return true;
 546 }
 547
 548 bool qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val,
 549                          Error **errp)
 550 {
 551     QemuOpt *opt;
 552     const QemuOptDesc *desc;
 553     const QemuOptsList *list = opts->list;
 554
 555     desc = find_desc_by_name(list->desc, name);
 556     if (!desc && !opts_accepts_any(list)) {
 557         error_setg(errp, "Invalid parameter '%s'", name);
 558         return false;
 559     }
 560
 561     opt = g_malloc0(sizeof(*opt));
 562     opt->name = g_strdup(name);
 563     opt->opts = opts;
 564     opt->desc = desc;
 565     opt->value.uint = val;
 566     opt->str = g_strdup_printf("%" PRId64, val);
 567     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 568     return true;
 569 }
 570
 571 /**
 572  * For each member of @opts, call @func(@opaque, name, value, @errp).
 573  * @func() may store an Error through @errp, but must return non-zero then.
 574  * When @func() returns non-zero, break the loop and return that value.
 575  * Return zero when the loop completes.
 576  */
 577 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 578                      Error **errp)
 579 {
 580     QemuOpt *opt;
 581     int rc;
 582
 583     QTAILQ_FOREACH(opt, &opts->head, next) {
 584         rc = func(opaque, opt->name, opt->str, errp);
 585         if (rc) {
 586             return rc;
 587         }
 588         assert(!errp || !*errp);
 589     }
 590     return 0;
 591 }
 592
 593 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 594 {
 595     QemuOpts *opts;
 596
 597     QTAILQ_FOREACH(opts, &list->head, next) {
 598         if (!opts->id && !id) {
 599             return opts;
 600         }
 601         if (opts->id && id && !strcmp(opts->id, id)) {
 602             return opts;
 603         }
 604     }
 605     return NULL;
 606 }
 607
 608 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 609                            int fail_if_exists, Error **errp)
 610 {
 611     QemuOpts *opts = NULL;
 612
 613     if (list->merge_lists) {
 614         if (id) {
 615             error_setg(errp, "Invalid parameter 'id'");
 616             return NULL;
 617         }
 618         opts = qemu_opts_find(list, NULL);
 619         if (opts) {
 620             return opts;
 621         }
 622     } else if (id) {
 623         assert(fail_if_exists);
 624         if (!id_wellformed(id)) {
 625             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id",
 626                        "an identifier");
 627             error_append_hint(errp, "Identifiers consist of letters, digits, "
 628                               "'-', '.', '_', starting with a letter.\n");
 629             return NULL;
 630         }
 631         opts = qemu_opts_find(list, id);
 632         if (opts != NULL) {
 633             error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
 634             return NULL;
 635         }
 636     }
 637     opts = g_malloc0(sizeof(*opts));
 638     opts->id = g_strdup(id);
 639     opts->list = list;
 640     loc_save(&opts->loc);
 641     QTAILQ_INIT(&opts->head);
 642     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 643     return opts;
 644 }
 645
 646 void qemu_opts_reset(QemuOptsList *list)
 647 {
 648     QemuOpts *opts, *next_opts;
 649
 650     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 651         qemu_opts_del(opts);
 652     }
 653 }
 654
 655 void qemu_opts_loc_restore(QemuOpts *opts)
 656 {
 657     loc_restore(&opts->loc);
 658 }
 659
 660 const char *qemu_opts_id(QemuOpts *opts)
 661 {
 662     return opts->id;
 663 }
 664
 665 /* The id string will be g_free()d by qemu_opts_del */
 666 void qemu_opts_set_id(QemuOpts *opts, char *id)
 667 {
 668     opts->id = id;
 669 }
 670
 671 void qemu_opts_del(QemuOpts *opts)
 672 {
 673     QemuOpt *opt;
 674
 675     if (opts == NULL) {
 676         return;
 677     }
 678
 679     for (;;) {
 680         opt = QTAILQ_FIRST(&opts->head);
 681         if (opt == NULL)
 682             break;
 683         qemu_opt_del(opt);
 684     }
 685     QTAILQ_REMOVE(&opts->list->head, opts, next);
 686     g_free(opts->id);
 687     g_free(opts);
 688 }
 689
 690 /* print value, escaping any commas in value */
 691 static void escaped_print(const char *value)
 692 {
 693     const char *ptr;
 694
 695     for (ptr = value; *ptr; ++ptr) {
 696         if (*ptr == ',') {
 697             putchar(',');
 698         }
 699         putchar(*ptr);
 700     }
 701 }
 702
 703 void qemu_opts_print(QemuOpts *opts, const char *separator)
 704 {
 705     QemuOpt *opt;
 706     QemuOptDesc *desc = opts->list->desc;
 707     const char *sep = "";
 708
 709     if (opts->id) {
 710         printf("id=%s", opts->id); /* passed id_wellformed -> no commas */
 711         sep = separator;
 712     }
 713
 714     if (desc[0].name == NULL) {
 715         QTAILQ_FOREACH(opt, &opts->head, next) {
 716             printf("%s%s=", sep, opt->name);
 717             escaped_print(opt->str);
 718             sep = separator;
 719         }
 720         return;
 721     }
 722     for (; desc && desc->name; desc++) {
 723         const char *value;
 724         opt = qemu_opt_find(opts, desc->name);
 725
 726         value = opt ? opt->str : desc->def_value_str;
 727         if (!value) {
 728             continue;
 729         }
 730         if (desc->type == QEMU_OPT_STRING) {
 731             printf("%s%s=", sep, desc->name);
 732             escaped_print(value);
 733         } else if ((desc->type == QEMU_OPT_SIZE ||
 734                     desc->type == QEMU_OPT_NUMBER) && opt) {
 735             printf("%s%s=%" PRId64, sep, desc->name, opt->value.uint);
 736         } else {
 737             printf("%s%s=%s", sep, desc->name, value);
 738         }
 739         sep = separator;
 740     }
 741 }
 742
 743 static const char *get_opt_name_value(const char *params,
 744                                       const char *firstname,
 745                                       bool warn_on_flag,
 746                                       bool *help_wanted,
 747                                       char **name, char **value)
 748 {
 749     const char *p;
 750     const char *prefix = "";
 751     size_t len;
 752     bool is_help = false;
 753
 754     len = strcspn(params, "=,");
 755     if (params[len] != '=') {
 756         /* found "foo,more" */
 757         if (firstname) {
 758             /* implicitly named first option */
 759             *name = g_strdup(firstname);
 760             p = get_opt_value(params, value);
 761         } else {
 762             /* option without value, must be a flag */
 763             p = get_opt_name(params, name, len);
 764             if (strncmp(*name, "no", 2) == 0) {
 765                 memmove(*name, *name + 2, strlen(*name + 2) + 1);
 766                 *value = g_strdup("off");
 767                 prefix = "no";
 768             } else {
 769                 *value = g_strdup("on");
 770                 is_help = is_help_option(*name);
 771             }
 772             if (!is_help && warn_on_flag) {
 773                 warn_report("short-form boolean option '%s%s' deprecated", prefix, *name);
 774                 if (g_str_equal(*name, "delay")) {
 775                     error_printf("Please use nodelay=%s instead\n", prefix[0] ? "on" : "off");
 776                 } else {
 777                     error_printf("Please use %s=%s instead\n", *name, *value);
 778                 }
 779             }
 780         }
 781     } else {
 782         /* found "foo=bar,more" */
 783         p = get_opt_name(params, name, len);
 784         assert(*p == '=');
 785         p++;
 786         p = get_opt_value(p, value);
 787     }
 788
 789     assert(!*p || *p == ',');
 790     if (help_wanted && is_help) {
 791         *help_wanted = true;
 792     }
 793     if (*p == ',') {
 794         p++;
 795     }
 796     return p;
 797 }
 798
 799 static bool opts_do_parse(QemuOpts *opts, const char *params,
 800                           const char *firstname,
 801                           bool warn_on_flag, bool *help_wanted, Error **errp)
 802 {
 803     char *option, *value;
 804     const char *p;
 805     QemuOpt *opt;
 806
 807     for (p = params; *p;) {
 808         p = get_opt_name_value(p, firstname, warn_on_flag, help_wanted, &option, &value);
 809         if (help_wanted && *help_wanted) {
 810             g_free(option);
 811             g_free(value);
 812             return false;
 813         }
 814         firstname = NULL;
 815
 816         if (!strcmp(option, "id")) {
 817             g_free(option);
 818             g_free(value);
 819             continue;
 820         }
 821
 822         opt = opt_create(opts, option, value);
 823         g_free(option);
 824         if (!opt_validate(opt, errp)) {
 825             qemu_opt_del(opt);
 826             return false;
 827         }
 828     }
 829
 830     return true;
 831 }
 832
 833 static char *opts_parse_id(const char *params)
 834 {
 835     const char *p;
 836     char *name, *value;
 837
 838     for (p = params; *p;) {
 839         p = get_opt_name_value(p, NULL, false, NULL, &name, &value);
 840         if (!strcmp(name, "id")) {
 841             g_free(name);
 842             return value;
 843         }
 844         g_free(name);
 845         g_free(value);
 846     }
 847
 848     return NULL;
 849 }
 850
 851 bool has_help_option(const char *params)
 852 {
 853     const char *p;
 854     char *name, *value;
 855     bool ret = false;
 856
 857     for (p = params; *p;) {
 858         p = get_opt_name_value(p, NULL, false, &ret, &name, &value);
 859         g_free(name);
 860         g_free(value);
 861         if (ret) {
 862             return true;
 863         }
 864     }
 865
 866     return false;
 867 }
 868
 869 /**
 870  * Store options parsed from @params into @opts.
 871  * If @firstname is non-null, the first key=value in @params may omit
 872  * key=, and is treated as if key was @firstname.
 873  * On error, store an error object through @errp if non-null.
 874  */
 875 bool qemu_opts_do_parse(QemuOpts *opts, const char *params,
 876                        const char *firstname, Error **errp)
 877 {
 878     return opts_do_parse(opts, params, firstname, false, NULL, errp);
 879 }
 880
 881 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 882                             bool permit_abbrev,
 883                             bool warn_on_flag, bool *help_wanted, Error **errp)
 884 {
 885     const char *firstname;
 886     char *id = opts_parse_id(params);
 887     QemuOpts *opts;
 888
 889     assert(!permit_abbrev || list->implied_opt_name);
 890     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 891
 892     opts = qemu_opts_create(list, id, !list->merge_lists, errp);
 893     g_free(id);
 894     if (opts == NULL) {
 895         return NULL;
 896     }
 897
 898     if (!opts_do_parse(opts, params, firstname,
 899                        warn_on_flag, help_wanted, errp)) {
 900         qemu_opts_del(opts);
 901         return NULL;
 902     }
 903
 904     return opts;
 905 }
 906
 907 /**
 908  * Create a QemuOpts in @list and with options parsed from @params.
 909  * If @permit_abbrev, the first key=value in @params may omit key=,
 910  * and is treated as if key was @list->implied_opt_name.
 911  * On error, store an error object through @errp if non-null.
 912  * Return the new QemuOpts on success, null pointer on error.
 913  */
 914 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 915                           bool permit_abbrev, Error **errp)
 916 {
 917     return opts_parse(list, params, permit_abbrev, false, NULL, errp);
 918 }
 919
 920 /**
 921  * Create a QemuOpts in @list and with options parsed from @params.
 922  * If @permit_abbrev, the first key=value in @params may omit key=,
 923  * and is treated as if key was @list->implied_opt_name.
 924  * Report errors with error_report_err().  This is inappropriate in
 925  * QMP context.  Do not use this function there!
 926  * Return the new QemuOpts on success, null pointer on error.
 927  */
 928 QemuOpts *qemu_opts_parse_noisily(QemuOptsList *list, const char *params,
 929                                   bool permit_abbrev)
 930 {
 931     Error *err = NULL;
 932     QemuOpts *opts;
 933     bool help_wanted = false;
 934
 935     opts = opts_parse(list, params, permit_abbrev, true,
 936                       opts_accepts_any(list) ? NULL : &help_wanted,
 937                       &err);
 938     if (!opts) {
 939         assert(!!err + !!help_wanted == 1);
 940         if (help_wanted) {
 941             qemu_opts_print_help(list, true);
 942         } else {
 943             error_report_err(err);
 944         }
 945     }
 946     return opts;
 947 }
 948
 949 static bool qemu_opts_from_qdict_entry(QemuOpts *opts,
 950                                        const QDictEntry *entry,
 951                                        Error **errp)
 952 {
 953     const char *key = qdict_entry_key(entry);
 954     QObject *obj = qdict_entry_value(entry);
 955     char buf[32];
 956     g_autofree char *tmp = NULL;
 957     const char *value;
 958
 959     if (!strcmp(key, "id")) {
 960         return true;
 961     }
 962
 963     switch (qobject_type(obj)) {
 964     case QTYPE_QSTRING:
 965         value = qstring_get_str(qobject_to(QString, obj));
 966         break;
 967     case QTYPE_QNUM:
 968         tmp = qnum_to_string(qobject_to(QNum, obj));
 969         value = tmp;
 970         break;
 971     case QTYPE_QBOOL:
 972         pstrcpy(buf, sizeof(buf),
 973                 qbool_get_bool(qobject_to(QBool, obj)) ? "on" : "off");
 974         value = buf;
 975         break;
 976     default:
 977         return true;
 978     }
 979
 980     return qemu_opt_set(opts, key, value, errp);
 981 }
 982
 983 /*
 984  * Create QemuOpts from a QDict.
 985  * Use value of key "id" as ID if it exists and is a QString.  Only
 986  * QStrings, QNums and QBools are copied.  Entries with other types
 987  * are silently ignored.
 988  */
 989 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
 990                                Error **errp)
 991 {
 992     QemuOpts *opts;
 993     const QDictEntry *entry;
 994
 995     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1, errp);
 996     if (!opts) {
 997         return NULL;
 998     }
 999
1000     for (entry = qdict_first(qdict);
1001          entry;
1002          entry = qdict_next(qdict, entry)) {
1003         if (!qemu_opts_from_qdict_entry(opts, entry, errp)) {
1004             qemu_opts_del(opts);
1005             return NULL;
1006         }
1007     }
1008
1009     return opts;
1010 }
1011
1012 /*
1013  * Adds all QDict entries to the QemuOpts that can be added and removes them
1014  * from the QDict. When this function returns, the QDict contains only those
1015  * entries that couldn't be added to the QemuOpts.
1016  */
1017 bool qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
1018 {
1019     const QDictEntry *entry, *next;
1020
1021     entry = qdict_first(qdict);
1022
1023     while (entry != NULL) {
1024         next = qdict_next(qdict, entry);
1025
1026         if (opts_accepts_any(opts->list) ||
1027             find_desc_by_name(opts->list->desc, entry->key)) {
1028             if (!qemu_opts_from_qdict_entry(opts, entry, errp)) {
1029                 return false;
1030             }
1031             qdict_del(qdict, entry->key);
1032         }
1033
1034         entry = next;
1035     }
1036
1037     return true;
1038 }
1039
1040 /*
1041  * Convert from QemuOpts to QDict. The QDict values are of type QString.
1042  *
1043  * If @list is given, only add those options to the QDict that are contained in
1044  * the list. If @del is true, any options added to the QDict are removed from
1045  * the QemuOpts, otherwise they remain there.
1046  *
1047  * If two options in @opts have the same name, they are processed in order
1048  * so that the last one wins (consistent with the reverse iteration in
1049  * qemu_opt_find()), but all of them are deleted if @del is true.
1050  *
1051  * TODO We'll want to use types appropriate for opt->desc->type, but
1052  * this is enough for now.
1053  */
1054 QDict *qemu_opts_to_qdict_filtered(QemuOpts *opts, QDict *qdict,
1055                                    QemuOptsList *list, bool del)
1056 {
1057     QemuOpt *opt, *next;
1058
1059     if (!qdict) {
1060         qdict = qdict_new();
1061     }
1062     if (opts->id) {
1063         qdict_put_str(qdict, "id", opts->id);
1064     }
1065     QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next) {
1066         if (list) {
1067             QemuOptDesc *desc;
1068             bool found = false;
1069             for (desc = list->desc; desc->name; desc++) {
1070                 if (!strcmp(desc->name, opt->name)) {
1071                     found = true;
1072                     break;
1073                 }
1074             }
1075             if (!found) {
1076                 continue;
1077             }
1078         }
1079         qdict_put_str(qdict, opt->name, opt->str);
1080         if (del) {
1081             qemu_opt_del(opt);
1082         }
1083     }
1084     return qdict;
1085 }
1086
1087 /* Copy all options in a QemuOpts to the given QDict. See
1088  * qemu_opts_to_qdict_filtered() for details. */
1089 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1090 {
1091     return qemu_opts_to_qdict_filtered(opts, qdict, NULL, false);
1092 }
1093
1094 /* Validate parsed opts against descriptions where no
1095  * descriptions were provided in the QemuOptsList.
1096  */
1097 bool qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1098 {
1099     QemuOpt *opt;
1100
1101     assert(opts_accepts_any(opts->list));
1102
1103     QTAILQ_FOREACH(opt, &opts->head, next) {
1104         opt->desc = find_desc_by_name(desc, opt->name);
1105         if (!opt->desc) {
1106             error_setg(errp, "Invalid parameter '%s'", opt->name);
1107             return false;
1108         }
1109
1110         if (!qemu_opt_parse(opt, errp)) {
1111             return false;
1112         }
1113     }
1114
1115     return true;
1116 }
1117
1118 /**
1119  * For each member of @list, call @func(@opaque, member, @errp).
1120  * Call it with the current location temporarily set to the member's.
1121  * @func() may store an Error through @errp, but must return non-zero then.
1122  * When @func() returns non-zero, break the loop and return that value.
1123  * Return zero when the loop completes.
1124  */
1125 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
1126                       void *opaque, Error **errp)
1127 {
1128     Location loc;
1129     QemuOpts *opts, *next;
1130     int rc = 0;
1131
1132     loc_push_none(&loc);
1133     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next) {
1134         loc_restore(&opts->loc);
1135         rc = func(opaque, opts, errp);
1136         if (rc) {
1137             break;
1138         }
1139         assert(!errp || !*errp);
1140     }
1141     loc_pop(&loc);
1142     return rc;
1143 }
1144
1145 static size_t count_opts_list(QemuOptsList *list)
1146 {
1147     QemuOptDesc *desc = NULL;
1148     size_t num_opts = 0;
1149
1150     if (!list) {
1151         return 0;
1152     }
1153
1154     desc = list->desc;
1155     while (desc && desc->name) {
1156         num_opts++;
1157         desc++;
1158     }
1159
1160     return num_opts;
1161 }
1162
1163 void qemu_opts_free(QemuOptsList *list)
1164 {
1165     g_free(list);
1166 }
1167
1168 /* Realloc dst option list and append options from an option list (list)
1169  * to it. dst could be NULL or a malloced list.
1170  * The lifetime of dst must be shorter than the input list because the
1171  * QemuOptDesc->name, ->help, and ->def_value_str strings are shared.
1172  */
1173 QemuOptsList *qemu_opts_append(QemuOptsList *dst,
1174                                QemuOptsList *list)
1175 {
1176     size_t num_opts, num_dst_opts;
1177     QemuOptDesc *desc;
1178     bool need_init = false;
1179     bool need_head_update;
1180
1181     if (!list) {
1182         return dst;
1183     }
1184
1185     /* If dst is NULL, after realloc, some area of dst should be initialized
1186      * before adding options to it.
1187      */
1188     if (!dst) {
1189         need_init = true;
1190         need_head_update = true;
1191     } else {
1192         /* Moreover, even if dst is not NULL, the realloc may move it to a
1193          * different address in which case we may get a stale tail pointer
1194          * in dst->head. */
1195         need_head_update = QTAILQ_EMPTY(&dst->head);
1196     }
1197
1198     num_opts = count_opts_list(dst);
1199     num_dst_opts = num_opts;
1200     num_opts += count_opts_list(list);
1201     dst = g_realloc(dst, sizeof(QemuOptsList) +
1202                     (num_opts + 1) * sizeof(QemuOptDesc));
1203     if (need_init) {
1204         dst->name = NULL;
1205         dst->implied_opt_name = NULL;
1206         dst->merge_lists = false;
1207     }
1208     if (need_head_update) {
1209         QTAILQ_INIT(&dst->head);
1210     }
1211     dst->desc[num_dst_opts].name = NULL;
1212
1213     /* append list->desc to dst->desc */
1214     if (list) {
1215         desc = list->desc;
1216         while (desc && desc->name) {
1217             if (find_desc_by_name(dst->desc, desc->name) == NULL) {
1218                 dst->desc[num_dst_opts++] = *desc;
1219                 dst->desc[num_dst_opts].name = NULL;
1220             }
1221             desc++;
1222         }
1223     }
1224
1225     return dst;
1226 }