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-common.h"
  30 #include "qemu/error-report.h"
  31 #include "qapi/qmp/types.h"
  32 #include "qapi/qmp/qerror.h"
  33 #include "qemu/option_int.h"
  34 #include "qemu/cutils.h"
  35 #include "qemu/id.h"
  36 #include "qemu/help_option.h"
  37
  38 /*
  39  * Extracts the name of an option from the parameter string (p points at the
  40  * first byte of the option name)
  41  *
  42  * The option name is delimited by delim (usually , or =) or the string end
  43  * and is copied into buf. If the option name is longer than buf_size, it is
  44  * truncated. buf is always zero terminated.
  45  *
  46  * The return value is the position of the delimiter/zero byte after the option
  47  * name in p.
  48  */
  49 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim)
  50 {
  51     char *q;
  52
  53     q = buf;
  54     while (*p != '\0' && *p != delim) {
  55         if (q && (q - buf) < buf_size - 1)
  56             *q++ = *p;
  57         p++;
  58     }
  59     if (q)
  60         *q = '\0';
  61
  62     return p;
  63 }
  64
  65 /*
  66  * Extracts the value of an option from the parameter string p (p points at the
  67  * first byte of the option value)
  68  *
  69  * This function is comparable to get_opt_name with the difference that the
  70  * delimiter is fixed to be comma which starts a new option. To specify an
  71  * option value that contains commas, double each comma.
  72  */
  73 const char *get_opt_value(char *buf, int buf_size, const char *p)
  74 {
  75     char *q;
  76
  77     q = buf;
  78     while (*p != '\0') {
  79         if (*p == ',') {
  80             if (*(p + 1) != ',')
  81                 break;
  82             p++;
  83         }
  84         if (q && (q - buf) < buf_size - 1)
  85             *q++ = *p;
  86         p++;
  87     }
  88     if (q)
  89         *q = '\0';
  90
  91     return p;
  92 }
  93
  94 static void parse_option_bool(const char *name, const char *value, bool *ret,
  95                               Error **errp)
  96 {
  97     if (!strcmp(value, "on")) {
  98         *ret = 1;
  99     } else if (!strcmp(value, "off")) {
 100         *ret = 0;
 101     } else {
 102         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 103                    name, "'on' or 'off'");
 104     }
 105 }
 106
 107 static void parse_option_number(const char *name, const char *value,
 108                                 uint64_t *ret, Error **errp)
 109 {
 110     uint64_t number;
 111     int err;
 112
 113     err = qemu_strtou64(value, NULL, 0, &number);
 114     if (err == -ERANGE) {
 115         error_setg(errp, "Value '%s' is too large for parameter '%s'",
 116                    value, name);
 117         return;
 118     }
 119     if (err) {
 120         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 121         return;
 122     }
 123     *ret = number;
 124 }
 125
 126 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
 127                                             const char *name)
 128 {
 129     int i;
 130
 131     for (i = 0; desc[i].name != NULL; i++) {
 132         if (strcmp(desc[i].name, name) == 0) {
 133             return &desc[i];
 134         }
 135     }
 136
 137     return NULL;
 138 }
 139
 140 void parse_option_size(const char *name, const char *value,
 141                        uint64_t *ret, Error **errp)
 142 {
 143     uint64_t size;
 144     int err;
 145
 146     err = qemu_strtosz(value, NULL, &size);
 147     if (err == -ERANGE) {
 148         error_setg(errp, "Value '%s' is out of range for parameter '%s'",
 149                    value, name);
 150         return;
 151     }
 152     if (err) {
 153         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
 154                    "a non-negative number below 2^64");
 155         error_append_hint(errp, "Optional suffix k, M, G, T, P or E means"
 156                           " kilo-, mega-, giga-, tera-, peta-\n"
 157                           "and exabytes, respectively.\n");
 158         return;
 159     }
 160     *ret = size;
 161 }
 162
 163 bool has_help_option(const char *param)
 164 {
 165     size_t buflen = strlen(param) + 1;
 166     char *buf = g_malloc(buflen);
 167     const char *p = param;
 168     bool result = false;
 169
 170     while (*p) {
 171         p = get_opt_value(buf, buflen, p);
 172         if (*p) {
 173             p++;
 174         }
 175
 176         if (is_help_option(buf)) {
 177             result = true;
 178             goto out;
 179         }
 180     }
 181
 182 out:
 183     g_free(buf);
 184     return result;
 185 }
 186
 187 bool is_valid_option_list(const char *param)
 188 {
 189     size_t buflen = strlen(param) + 1;
 190     char *buf = g_malloc(buflen);
 191     const char *p = param;
 192     bool result = true;
 193
 194     while (*p) {
 195         p = get_opt_value(buf, buflen, p);
 196         if (*p && !*++p) {
 197             result = false;
 198             goto out;
 199         }
 200
 201         if (!*buf || *buf == ',') {
 202             result = false;
 203             goto out;
 204         }
 205     }
 206
 207 out:
 208     g_free(buf);
 209     return result;
 210 }
 211
 212 void qemu_opts_print_help(QemuOptsList *list)
 213 {
 214     QemuOptDesc *desc;
 215
 216     assert(list);
 217     desc = list->desc;
 218     printf("Supported options:\n");
 219     while (desc && desc->name) {
 220         printf("%-16s %s\n", desc->name,
 221                desc->help ? desc->help : "No description available");
 222         desc++;
 223     }
 224 }
 225 /* ------------------------------------------------------------------ */
 226
 227 QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 228 {
 229     QemuOpt *opt;
 230
 231     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 232         if (strcmp(opt->name, name) != 0)
 233             continue;
 234         return opt;
 235     }
 236     return NULL;
 237 }
 238
 239 static void qemu_opt_del(QemuOpt *opt)
 240 {
 241     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 242     g_free(opt->name);
 243     g_free(opt->str);
 244     g_free(opt);
 245 }
 246
 247 /* qemu_opt_set allows many settings for the same option.
 248  * This function deletes all settings for an option.
 249  */
 250 static void qemu_opt_del_all(QemuOpts *opts, const char *name)
 251 {
 252     QemuOpt *opt, *next_opt;
 253
 254     QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next_opt) {
 255         if (!strcmp(opt->name, name)) {
 256             qemu_opt_del(opt);
 257         }
 258     }
 259 }
 260
 261 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 262 {
 263     QemuOpt *opt;
 264
 265     if (opts == NULL) {
 266         return NULL;
 267     }
 268
 269     opt = qemu_opt_find(opts, name);
 270     if (!opt) {
 271         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 272         if (desc && desc->def_value_str) {
 273             return desc->def_value_str;
 274         }
 275     }
 276     return opt ? opt->str : NULL;
 277 }
 278
 279 void qemu_opt_iter_init(QemuOptsIter *iter, QemuOpts *opts, const char *name)
 280 {
 281     iter->opts = opts;
 282     iter->opt = QTAILQ_FIRST(&opts->head);
 283     iter->name = name;
 284 }
 285
 286 const char *qemu_opt_iter_next(QemuOptsIter *iter)
 287 {
 288     QemuOpt *ret = iter->opt;
 289     if (iter->name) {
 290         while (ret && !g_str_equal(iter->name, ret->name)) {
 291             ret = QTAILQ_NEXT(ret, next);
 292         }
 293     }
 294     iter->opt = ret ? QTAILQ_NEXT(ret, next) : NULL;
 295     return ret ? ret->str : NULL;
 296 }
 297
 298 /* Get a known option (or its default) and remove it from the list
 299  * all in one action. Return a malloced string of the option value.
 300  * Result must be freed by caller with g_free().
 301  */
 302 char *qemu_opt_get_del(QemuOpts *opts, const char *name)
 303 {
 304     QemuOpt *opt;
 305     const QemuOptDesc *desc;
 306     char *str = NULL;
 307
 308     if (opts == NULL) {
 309         return NULL;
 310     }
 311
 312     opt = qemu_opt_find(opts, name);
 313     if (!opt) {
 314         desc = find_desc_by_name(opts->list->desc, name);
 315         if (desc && desc->def_value_str) {
 316             str = g_strdup(desc->def_value_str);
 317         }
 318         return str;
 319     }
 320     str = opt->str;
 321     opt->str = NULL;
 322     qemu_opt_del_all(opts, name);
 323     return str;
 324 }
 325
 326 bool qemu_opt_has_help_opt(QemuOpts *opts)
 327 {
 328     QemuOpt *opt;
 329
 330     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 331         if (is_help_option(opt->name)) {
 332             return true;
 333         }
 334     }
 335     return false;
 336 }
 337
 338 static bool qemu_opt_get_bool_helper(QemuOpts *opts, const char *name,
 339                                      bool defval, bool del)
 340 {
 341     QemuOpt *opt;
 342     bool ret = defval;
 343
 344     if (opts == NULL) {
 345         return ret;
 346     }
 347
 348     opt = qemu_opt_find(opts, name);
 349     if (opt == NULL) {
 350         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 351         if (desc && desc->def_value_str) {
 352             parse_option_bool(name, desc->def_value_str, &ret, &error_abort);
 353         }
 354         return ret;
 355     }
 356     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 357     ret = opt->value.boolean;
 358     if (del) {
 359         qemu_opt_del_all(opts, name);
 360     }
 361     return ret;
 362 }
 363
 364 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 365 {
 366     return qemu_opt_get_bool_helper(opts, name, defval, false);
 367 }
 368
 369 bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval)
 370 {
 371     return qemu_opt_get_bool_helper(opts, name, defval, true);
 372 }
 373
 374 static uint64_t qemu_opt_get_number_helper(QemuOpts *opts, const char *name,
 375                                            uint64_t defval, bool del)
 376 {
 377     QemuOpt *opt;
 378     uint64_t ret = defval;
 379
 380     if (opts == NULL) {
 381         return ret;
 382     }
 383
 384     opt = qemu_opt_find(opts, name);
 385     if (opt == NULL) {
 386         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 387         if (desc && desc->def_value_str) {
 388             parse_option_number(name, desc->def_value_str, &ret, &error_abort);
 389         }
 390         return ret;
 391     }
 392     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 393     ret = opt->value.uint;
 394     if (del) {
 395         qemu_opt_del_all(opts, name);
 396     }
 397     return ret;
 398 }
 399
 400 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 401 {
 402     return qemu_opt_get_number_helper(opts, name, defval, false);
 403 }
 404
 405 uint64_t qemu_opt_get_number_del(QemuOpts *opts, const char *name,
 406                                  uint64_t defval)
 407 {
 408     return qemu_opt_get_number_helper(opts, name, defval, true);
 409 }
 410
 411 static uint64_t qemu_opt_get_size_helper(QemuOpts *opts, const char *name,
 412                                          uint64_t defval, bool del)
 413 {
 414     QemuOpt *opt;
 415     uint64_t ret = defval;
 416
 417     if (opts == NULL) {
 418         return ret;
 419     }
 420
 421     opt = qemu_opt_find(opts, name);
 422     if (opt == NULL) {
 423         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 424         if (desc && desc->def_value_str) {
 425             parse_option_size(name, desc->def_value_str, &ret, &error_abort);
 426         }
 427         return ret;
 428     }
 429     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 430     ret = opt->value.uint;
 431     if (del) {
 432         qemu_opt_del_all(opts, name);
 433     }
 434     return ret;
 435 }
 436
 437 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 438 {
 439     return qemu_opt_get_size_helper(opts, name, defval, false);
 440 }
 441
 442 uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name,
 443                                uint64_t defval)
 444 {
 445     return qemu_opt_get_size_helper(opts, name, defval, true);
 446 }
 447
 448 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
 449 {
 450     if (opt->desc == NULL)
 451         return;
 452
 453     switch (opt->desc->type) {
 454     case QEMU_OPT_STRING:
 455         /* nothing */
 456         return;
 457     case QEMU_OPT_BOOL:
 458         parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
 459         break;
 460     case QEMU_OPT_NUMBER:
 461         parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
 462         break;
 463     case QEMU_OPT_SIZE:
 464         parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
 465         break;
 466     default:
 467         abort();
 468     }
 469 }
 470
 471 static bool opts_accepts_any(const QemuOpts *opts)
 472 {
 473     return opts->list->desc[0].name == NULL;
 474 }
 475
 476 int qemu_opt_unset(QemuOpts *opts, const char *name)
 477 {
 478     QemuOpt *opt = qemu_opt_find(opts, name);
 479
 480     assert(opts_accepts_any(opts));
 481
 482     if (opt == NULL) {
 483         return -1;
 484     } else {
 485         qemu_opt_del(opt);
 486         return 0;
 487     }
 488 }
 489
 490 static void opt_set(QemuOpts *opts, const char *name, const char *value,
 491                     bool prepend, Error **errp)
 492 {
 493     QemuOpt *opt;
 494     const QemuOptDesc *desc;
 495     Error *local_err = NULL;
 496
 497     desc = find_desc_by_name(opts->list->desc, name);
 498     if (!desc && !opts_accepts_any(opts)) {
 499         error_setg(errp, QERR_INVALID_PARAMETER, name);
 500         return;
 501     }
 502
 503     opt = g_malloc0(sizeof(*opt));
 504     opt->name = g_strdup(name);
 505     opt->opts = opts;
 506     if (prepend) {
 507         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 508     } else {
 509         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 510     }
 511     opt->desc = desc;
 512     opt->str = g_strdup(value);
 513     assert(opt->str);
 514     qemu_opt_parse(opt, &local_err);
 515     if (local_err) {
 516         error_propagate(errp, local_err);
 517         qemu_opt_del(opt);
 518     }
 519 }
 520
 521 void qemu_opt_set(QemuOpts *opts, const char *name, const char *value,
 522                   Error **errp)
 523 {
 524     opt_set(opts, name, value, false, errp);
 525 }
 526
 527 void qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val,
 528                        Error **errp)
 529 {
 530     QemuOpt *opt;
 531     const QemuOptDesc *desc = opts->list->desc;
 532
 533     opt = g_malloc0(sizeof(*opt));
 534     opt->desc = find_desc_by_name(desc, name);
 535     if (!opt->desc && !opts_accepts_any(opts)) {
 536         error_setg(errp, QERR_INVALID_PARAMETER, name);
 537         g_free(opt);
 538         return;
 539     }
 540
 541     opt->name = g_strdup(name);
 542     opt->opts = opts;
 543     opt->value.boolean = !!val;
 544     opt->str = g_strdup(val ? "on" : "off");
 545     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 546 }
 547
 548 void qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val,
 549                          Error **errp)
 550 {
 551     QemuOpt *opt;
 552     const QemuOptDesc *desc = opts->list->desc;
 553
 554     opt = g_malloc0(sizeof(*opt));
 555     opt->desc = find_desc_by_name(desc, name);
 556     if (!opt->desc && !opts_accepts_any(opts)) {
 557         error_setg(errp, QERR_INVALID_PARAMETER, name);
 558         g_free(opt);
 559         return;
 560     }
 561
 562     opt->name = g_strdup(name);
 563     opt->opts = opts;
 564     opt->value.uint = val;
 565     opt->str = g_strdup_printf("%" PRId64, val);
 566     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 567 }
 568
 569 /**
 570  * For each member of @opts, call @func(@opaque, name, value, @errp).
 571  * @func() may store an Error through @errp, but must return non-zero then.
 572  * When @func() returns non-zero, break the loop and return that value.
 573  * Return zero when the loop completes.
 574  */
 575 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 576                      Error **errp)
 577 {
 578     QemuOpt *opt;
 579     int rc;
 580
 581     QTAILQ_FOREACH(opt, &opts->head, next) {
 582         rc = func(opaque, opt->name, opt->str, errp);
 583         if (rc) {
 584             return rc;
 585         }
 586         assert(!errp || !*errp);
 587     }
 588     return 0;
 589 }
 590
 591 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 592 {
 593     QemuOpts *opts;
 594
 595     QTAILQ_FOREACH(opts, &list->head, next) {
 596         if (!opts->id && !id) {
 597             return opts;
 598         }
 599         if (opts->id && id && !strcmp(opts->id, id)) {
 600             return opts;
 601         }
 602     }
 603     return NULL;
 604 }
 605
 606 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 607                            int fail_if_exists, Error **errp)
 608 {
 609     QemuOpts *opts = NULL;
 610
 611     if (id) {
 612         if (!id_wellformed(id)) {
 613             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id",
 614                        "an identifier");
 615             error_append_hint(errp, "Identifiers consist of letters, digits, "
 616                               "'-', '.', '_', starting with a letter.\n");
 617             return NULL;
 618         }
 619         opts = qemu_opts_find(list, id);
 620         if (opts != NULL) {
 621             if (fail_if_exists && !list->merge_lists) {
 622                 error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
 623                 return NULL;
 624             } else {
 625                 return opts;
 626             }
 627         }
 628     } else if (list->merge_lists) {
 629         opts = qemu_opts_find(list, NULL);
 630         if (opts) {
 631             return opts;
 632         }
 633     }
 634     opts = g_malloc0(sizeof(*opts));
 635     opts->id = g_strdup(id);
 636     opts->list = list;
 637     loc_save(&opts->loc);
 638     QTAILQ_INIT(&opts->head);
 639     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 640     return opts;
 641 }
 642
 643 void qemu_opts_reset(QemuOptsList *list)
 644 {
 645     QemuOpts *opts, *next_opts;
 646
 647     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 648         qemu_opts_del(opts);
 649     }
 650 }
 651
 652 void qemu_opts_loc_restore(QemuOpts *opts)
 653 {
 654     loc_restore(&opts->loc);
 655 }
 656
 657 void qemu_opts_set(QemuOptsList *list, const char *id,
 658                    const char *name, const char *value, Error **errp)
 659 {
 660     QemuOpts *opts;
 661     Error *local_err = NULL;
 662
 663     opts = qemu_opts_create(list, id, 1, &local_err);
 664     if (local_err) {
 665         error_propagate(errp, local_err);
 666         return;
 667     }
 668     qemu_opt_set(opts, name, value, errp);
 669 }
 670
 671 const char *qemu_opts_id(QemuOpts *opts)
 672 {
 673     return opts->id;
 674 }
 675
 676 /* The id string will be g_free()d by qemu_opts_del */
 677 void qemu_opts_set_id(QemuOpts *opts, char *id)
 678 {
 679     opts->id = id;
 680 }
 681
 682 void qemu_opts_del(QemuOpts *opts)
 683 {
 684     QemuOpt *opt;
 685
 686     if (opts == NULL) {
 687         return;
 688     }
 689
 690     for (;;) {
 691         opt = QTAILQ_FIRST(&opts->head);
 692         if (opt == NULL)
 693             break;
 694         qemu_opt_del(opt);
 695     }
 696     QTAILQ_REMOVE(&opts->list->head, opts, next);
 697     g_free(opts->id);
 698     g_free(opts);
 699 }
 700
 701 /* print value, escaping any commas in value */
 702 static void escaped_print(const char *value)
 703 {
 704     const char *ptr;
 705
 706     for (ptr = value; *ptr; ++ptr) {
 707         if (*ptr == ',') {
 708             putchar(',');
 709         }
 710         putchar(*ptr);
 711     }
 712 }
 713
 714 void qemu_opts_print(QemuOpts *opts, const char *separator)
 715 {
 716     QemuOpt *opt;
 717     QemuOptDesc *desc = opts->list->desc;
 718     const char *sep = "";
 719
 720     if (opts->id) {
 721         printf("id=%s", opts->id); /* passed id_wellformed -> no commas */
 722         sep = separator;
 723     }
 724
 725     if (desc[0].name == NULL) {
 726         QTAILQ_FOREACH(opt, &opts->head, next) {
 727             printf("%s%s=", sep, opt->name);
 728             escaped_print(opt->str);
 729             sep = separator;
 730         }
 731         return;
 732     }
 733     for (; desc && desc->name; desc++) {
 734         const char *value;
 735         opt = qemu_opt_find(opts, desc->name);
 736
 737         value = opt ? opt->str : desc->def_value_str;
 738         if (!value) {
 739             continue;
 740         }
 741         if (desc->type == QEMU_OPT_STRING) {
 742             printf("%s%s=", sep, desc->name);
 743             escaped_print(value);
 744         } else if ((desc->type == QEMU_OPT_SIZE ||
 745                     desc->type == QEMU_OPT_NUMBER) && opt) {
 746             printf("%s%s=%" PRId64, sep, desc->name, opt->value.uint);
 747         } else {
 748             printf("%s%s=%s", sep, desc->name, value);
 749         }
 750         sep = separator;
 751     }
 752 }
 753
 754 static void opts_do_parse(QemuOpts *opts, const char *params,
 755                           const char *firstname, bool prepend, Error **errp)
 756 {
 757     char option[128], value[1024];
 758     const char *p,*pe,*pc;
 759     Error *local_err = NULL;
 760
 761     for (p = params; *p != '\0'; p++) {
 762         pe = strchr(p, '=');
 763         pc = strchr(p, ',');
 764         if (!pe || (pc && pc < pe)) {
 765             /* found "foo,more" */
 766             if (p == params && firstname) {
 767                 /* implicitly named first option */
 768                 pstrcpy(option, sizeof(option), firstname);
 769                 p = get_opt_value(value, sizeof(value), p);
 770             } else {
 771                 /* option without value, probably a flag */
 772                 p = get_opt_name(option, sizeof(option), p, ',');
 773                 if (strncmp(option, "no", 2) == 0) {
 774                     memmove(option, option+2, strlen(option+2)+1);
 775                     pstrcpy(value, sizeof(value), "off");
 776                 } else {
 777                     pstrcpy(value, sizeof(value), "on");
 778                 }
 779             }
 780         } else {
 781             /* found "foo=bar,more" */
 782             p = get_opt_name(option, sizeof(option), p, '=');
 783             if (*p != '=') {
 784                 break;
 785             }
 786             p++;
 787             p = get_opt_value(value, sizeof(value), p);
 788         }
 789         if (strcmp(option, "id") != 0) {
 790             /* store and parse */
 791             opt_set(opts, option, value, prepend, &local_err);
 792             if (local_err) {
 793                 error_propagate(errp, local_err);
 794                 return;
 795             }
 796         }
 797         if (*p != ',') {
 798             break;
 799         }
 800     }
 801 }
 802
 803 /**
 804  * Store options parsed from @params into @opts.
 805  * If @firstname is non-null, the first key=value in @params may omit
 806  * key=, and is treated as if key was @firstname.
 807  * On error, store an error object through @errp if non-null.
 808  */
 809 void qemu_opts_do_parse(QemuOpts *opts, const char *params,
 810                        const char *firstname, Error **errp)
 811 {
 812     opts_do_parse(opts, params, firstname, false, errp);
 813 }
 814
 815 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 816                             bool permit_abbrev, bool defaults, Error **errp)
 817 {
 818     const char *firstname;
 819     char value[1024], *id = NULL;
 820     const char *p;
 821     QemuOpts *opts;
 822     Error *local_err = NULL;
 823
 824     assert(!permit_abbrev || list->implied_opt_name);
 825     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 826
 827     if (strncmp(params, "id=", 3) == 0) {
 828         get_opt_value(value, sizeof(value), params+3);
 829         id = value;
 830     } else if ((p = strstr(params, ",id=")) != NULL) {
 831         get_opt_value(value, sizeof(value), p+4);
 832         id = value;
 833     }
 834
 835     /*
 836      * This code doesn't work for defaults && !list->merge_lists: when
 837      * params has no id=, and list has an element with !opts->id, it
 838      * appends a new element instead of returning the existing opts.
 839      * However, we got no use for this case.  Guard against possible
 840      * (if unlikely) future misuse:
 841      */
 842     assert(!defaults || list->merge_lists);
 843     opts = qemu_opts_create(list, id, !defaults, &local_err);
 844     if (opts == NULL) {
 845         error_propagate(errp, local_err);
 846         return NULL;
 847     }
 848
 849     opts_do_parse(opts, params, firstname, defaults, &local_err);
 850     if (local_err) {
 851         error_propagate(errp, local_err);
 852         qemu_opts_del(opts);
 853         return NULL;
 854     }
 855
 856     return opts;
 857 }
 858
 859 /**
 860  * Create a QemuOpts in @list and with options parsed from @params.
 861  * If @permit_abbrev, the first key=value in @params may omit key=,
 862  * and is treated as if key was @list->implied_opt_name.
 863  * On error, store an error object through @errp if non-null.
 864  * Return the new QemuOpts on success, null pointer on error.
 865  */
 866 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 867                           bool permit_abbrev, Error **errp)
 868 {
 869     return opts_parse(list, params, permit_abbrev, false, errp);
 870 }
 871
 872 /**
 873  * Create a QemuOpts in @list and with options parsed from @params.
 874  * If @permit_abbrev, the first key=value in @params may omit key=,
 875  * and is treated as if key was @list->implied_opt_name.
 876  * Report errors with error_report_err().  This is inappropriate in
 877  * QMP context.  Do not use this function there!
 878  * Return the new QemuOpts on success, null pointer on error.
 879  */
 880 QemuOpts *qemu_opts_parse_noisily(QemuOptsList *list, const char *params,
 881                                   bool permit_abbrev)
 882 {
 883     Error *err = NULL;
 884     QemuOpts *opts;
 885
 886     opts = opts_parse(list, params, permit_abbrev, false, &err);
 887     if (err) {
 888         error_report_err(err);
 889     }
 890     return opts;
 891 }
 892
 893 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 894                             int permit_abbrev)
 895 {
 896     QemuOpts *opts;
 897
 898     opts = opts_parse(list, params, permit_abbrev, true, NULL);
 899     assert(opts);
 900 }
 901
 902 typedef struct OptsFromQDictState {
 903     QemuOpts *opts;
 904     Error **errp;
 905 } OptsFromQDictState;
 906
 907 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 908 {
 909     OptsFromQDictState *state = opaque;
 910     char buf[32], *tmp = NULL;
 911     const char *value;
 912
 913     if (!strcmp(key, "id") || *state->errp) {
 914         return;
 915     }
 916
 917     switch (qobject_type(obj)) {
 918     case QTYPE_QSTRING:
 919         value = qstring_get_str(qobject_to_qstring(obj));
 920         break;
 921     case QTYPE_QNUM:
 922         tmp = qnum_to_string(qobject_to_qnum(obj));
 923         value = tmp;
 924         break;
 925     case QTYPE_QBOOL:
 926         pstrcpy(buf, sizeof(buf),
 927                 qbool_get_bool(qobject_to_qbool(obj)) ? "on" : "off");
 928         value = buf;
 929         break;
 930     default:
 931         return;
 932     }
 933
 934     qemu_opt_set(state->opts, key, value, state->errp);
 935     g_free(tmp);
 936 }
 937
 938 /*
 939  * Create QemuOpts from a QDict.
 940  * Use value of key "id" as ID if it exists and is a QString.  Only
 941  * QStrings, QNums and QBools are copied.  Entries with other types
 942  * are silently ignored.
 943  */
 944 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
 945                                Error **errp)
 946 {
 947     OptsFromQDictState state;
 948     Error *local_err = NULL;
 949     QemuOpts *opts;
 950
 951     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
 952                             &local_err);
 953     if (local_err) {
 954         error_propagate(errp, local_err);
 955         return NULL;
 956     }
 957
 958     assert(opts != NULL);
 959
 960     state.errp = &local_err;
 961     state.opts = opts;
 962     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
 963     if (local_err) {
 964         error_propagate(errp, local_err);
 965         qemu_opts_del(opts);
 966         return NULL;
 967     }
 968
 969     return opts;
 970 }
 971
 972 /*
 973  * Adds all QDict entries to the QemuOpts that can be added and removes them
 974  * from the QDict. When this function returns, the QDict contains only those
 975  * entries that couldn't be added to the QemuOpts.
 976  */
 977 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
 978 {
 979     const QDictEntry *entry, *next;
 980
 981     entry = qdict_first(qdict);
 982
 983     while (entry != NULL) {
 984         Error *local_err = NULL;
 985         OptsFromQDictState state = {
 986             .errp = &local_err,
 987             .opts = opts,
 988         };
 989
 990         next = qdict_next(qdict, entry);
 991
 992         if (find_desc_by_name(opts->list->desc, entry->key)) {
 993             qemu_opts_from_qdict_1(entry->key, entry->value, &state);
 994             if (local_err) {
 995                 error_propagate(errp, local_err);
 996                 return;
 997             } else {
 998                 qdict_del(qdict, entry->key);
 999             }
1000         }
1001
1002         entry = next;
1003     }
1004 }
1005
1006 /*
1007  * Convert from QemuOpts to QDict.
1008  * The QDict values are of type QString.
1009  * TODO We'll want to use types appropriate for opt->desc->type, but
1010  * this is enough for now.
1011  */
1012 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1013 {
1014     QemuOpt *opt;
1015
1016     if (!qdict) {
1017         qdict = qdict_new();
1018     }
1019     if (opts->id) {
1020         qdict_put_str(qdict, "id", opts->id);
1021     }
1022     QTAILQ_FOREACH(opt, &opts->head, next) {
1023         qdict_put_str(qdict, opt->name, opt->str);
1024     }
1025     return qdict;
1026 }
1027
1028 /* Validate parsed opts against descriptions where no
1029  * descriptions were provided in the QemuOptsList.
1030  */
1031 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1032 {
1033     QemuOpt *opt;
1034     Error *local_err = NULL;
1035
1036     assert(opts_accepts_any(opts));
1037
1038     QTAILQ_FOREACH(opt, &opts->head, next) {
1039         opt->desc = find_desc_by_name(desc, opt->name);
1040         if (!opt->desc) {
1041             error_setg(errp, QERR_INVALID_PARAMETER, opt->name);
1042             return;
1043         }
1044
1045         qemu_opt_parse(opt, &local_err);
1046         if (local_err) {
1047             error_propagate(errp, local_err);
1048             return;
1049         }
1050     }
1051 }
1052
1053 /**
1054  * For each member of @list, call @func(@opaque, member, @errp).
1055  * Call it with the current location temporarily set to the member's.
1056  * @func() may store an Error through @errp, but must return non-zero then.
1057  * When @func() returns non-zero, break the loop and return that value.
1058  * Return zero when the loop completes.
1059  */
1060 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
1061                       void *opaque, Error **errp)
1062 {
1063     Location loc;
1064     QemuOpts *opts;
1065     int rc = 0;
1066
1067     loc_push_none(&loc);
1068     QTAILQ_FOREACH(opts, &list->head, next) {
1069         loc_restore(&opts->loc);
1070         rc = func(opaque, opts, errp);
1071         if (rc) {
1072             break;
1073         }
1074         assert(!errp || !*errp);
1075     }
1076     loc_pop(&loc);
1077     return rc;
1078 }
1079
1080 static size_t count_opts_list(QemuOptsList *list)
1081 {
1082     QemuOptDesc *desc = NULL;
1083     size_t num_opts = 0;
1084
1085     if (!list) {
1086         return 0;
1087     }
1088
1089     desc = list->desc;
1090     while (desc && desc->name) {
1091         num_opts++;
1092         desc++;
1093     }
1094
1095     return num_opts;
1096 }
1097
1098 void qemu_opts_free(QemuOptsList *list)
1099 {
1100     g_free(list);
1101 }
1102
1103 /* Realloc dst option list and append options from an option list (list)
1104  * to it. dst could be NULL or a malloced list.
1105  * The lifetime of dst must be shorter than the input list because the
1106  * QemuOptDesc->name, ->help, and ->def_value_str strings are shared.
1107  */
1108 QemuOptsList *qemu_opts_append(QemuOptsList *dst,
1109                                QemuOptsList *list)
1110 {
1111     size_t num_opts, num_dst_opts;
1112     QemuOptDesc *desc;
1113     bool need_init = false;
1114     bool need_head_update;
1115
1116     if (!list) {
1117         return dst;
1118     }
1119
1120     /* If dst is NULL, after realloc, some area of dst should be initialized
1121      * before adding options to it.
1122      */
1123     if (!dst) {
1124         need_init = true;
1125         need_head_update = true;
1126     } else {
1127         /* Moreover, even if dst is not NULL, the realloc may move it to a
1128          * different address in which case we may get a stale tail pointer
1129          * in dst->head. */
1130         need_head_update = QTAILQ_EMPTY(&dst->head);
1131     }
1132
1133     num_opts = count_opts_list(dst);
1134     num_dst_opts = num_opts;
1135     num_opts += count_opts_list(list);
1136     dst = g_realloc(dst, sizeof(QemuOptsList) +
1137                     (num_opts + 1) * sizeof(QemuOptDesc));
1138     if (need_init) {
1139         dst->name = NULL;
1140         dst->implied_opt_name = NULL;
1141         dst->merge_lists = false;
1142     }
1143     if (need_head_update) {
1144         QTAILQ_INIT(&dst->head);
1145     }
1146     dst->desc[num_dst_opts].name = NULL;
1147
1148     /* append list->desc to dst->desc */
1149     if (list) {
1150         desc = list->desc;
1151         while (desc && desc->name) {
1152             if (find_desc_by_name(dst->desc, desc->name) == NULL) {
1153                 dst->desc[num_dst_opts++] = *desc;
1154                 dst->desc[num_dst_opts].name = NULL;
1155             }
1156             desc++;
1157         }
1158     }
1159
1160     return dst;
1161 }