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 <stdio.h>
  27 #include <string.h>
  28
  29 #include "qemu-common.h"
  30 #include "qemu-error.h"
  31 #include "qemu-objects.h"
  32 #include "qemu-option.h"
  33 #include "qerror.h"
  34
  35 /*
  36  * Extracts the name of an option from the parameter string (p points at the
  37  * first byte of the option name)
  38  *
  39  * The option name is delimited by delim (usually , or =) or the string end
  40  * and is copied into buf. If the option name is longer than buf_size, it is
  41  * truncated. buf is always zero terminated.
  42  *
  43  * The return value is the position of the delimiter/zero byte after the option
  44  * name in p.
  45  */
  46 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim)
  47 {
  48     char *q;
  49
  50     q = buf;
  51     while (*p != '\0' && *p != delim) {
  52         if (q && (q - buf) < buf_size - 1)
  53             *q++ = *p;
  54         p++;
  55     }
  56     if (q)
  57         *q = '\0';
  58
  59     return p;
  60 }
  61
  62 /*
  63  * Extracts the value of an option from the parameter string p (p points at the
  64  * first byte of the option value)
  65  *
  66  * This function is comparable to get_opt_name with the difference that the
  67  * delimiter is fixed to be comma which starts a new option. To specify an
  68  * option value that contains commas, double each comma.
  69  */
  70 const char *get_opt_value(char *buf, int buf_size, const char *p)
  71 {
  72     char *q;
  73
  74     q = buf;
  75     while (*p != '\0') {
  76         if (*p == ',') {
  77             if (*(p + 1) != ',')
  78                 break;
  79             p++;
  80         }
  81         if (q && (q - buf) < buf_size - 1)
  82             *q++ = *p;
  83         p++;
  84     }
  85     if (q)
  86         *q = '\0';
  87
  88     return p;
  89 }
  90
  91 int get_next_param_value(char *buf, int buf_size,
  92                          const char *tag, const char **pstr)
  93 {
  94     const char *p;
  95     char option[128];
  96
  97     p = *pstr;
  98     for(;;) {
  99         p = get_opt_name(option, sizeof(option), p, '=');
 100         if (*p != '=')
 101             break;
 102         p++;
 103         if (!strcmp(tag, option)) {
 104             *pstr = get_opt_value(buf, buf_size, p);
 105             if (**pstr == ',') {
 106                 (*pstr)++;
 107             }
 108             return strlen(buf);
 109         } else {
 110             p = get_opt_value(NULL, 0, p);
 111         }
 112         if (*p != ',')
 113             break;
 114         p++;
 115     }
 116     return 0;
 117 }
 118
 119 int get_param_value(char *buf, int buf_size,
 120                     const char *tag, const char *str)
 121 {
 122     return get_next_param_value(buf, buf_size, tag, &str);
 123 }
 124
 125 int check_params(char *buf, int buf_size,
 126                  const char * const *params, const char *str)
 127 {
 128     const char *p;
 129     int i;
 130
 131     p = str;
 132     while (*p != '\0') {
 133         p = get_opt_name(buf, buf_size, p, '=');
 134         if (*p != '=') {
 135             return -1;
 136         }
 137         p++;
 138         for (i = 0; params[i] != NULL; i++) {
 139             if (!strcmp(params[i], buf)) {
 140                 break;
 141             }
 142         }
 143         if (params[i] == NULL) {
 144             return -1;
 145         }
 146         p = get_opt_value(NULL, 0, p);
 147         if (*p != ',') {
 148             break;
 149         }
 150         p++;
 151     }
 152     return 0;
 153 }
 154
 155 /*
 156  * Searches an option list for an option with the given name
 157  */
 158 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
 159     const char *name)
 160 {
 161     while (list && list->name) {
 162         if (!strcmp(list->name, name)) {
 163             return list;
 164         }
 165         list++;
 166     }
 167
 168     return NULL;
 169 }
 170
 171 static int parse_option_bool(const char *name, const char *value, int *ret)
 172 {
 173     if (value != NULL) {
 174         if (!strcmp(value, "on")) {
 175             *ret = 1;
 176         } else if (!strcmp(value, "off")) {
 177             *ret = 0;
 178         } else {
 179             fprintf(stderr, "Option '%s': Use 'on' or 'off'\n", name);
 180             return -1;
 181         }
 182     } else {
 183         *ret = 1;
 184     }
 185     return 0;
 186 }
 187
 188 static int parse_option_number(const char *name, const char *value, uint64_t *ret)
 189 {
 190     char *postfix;
 191     uint64_t number;
 192
 193     if (value != NULL) {
 194         number = strtoull(value, &postfix, 0);
 195         if (*postfix != '\0') {
 196             fprintf(stderr, "Option '%s' needs a number as parameter\n", name);
 197             return -1;
 198         }
 199         *ret = number;
 200     } else {
 201         fprintf(stderr, "Option '%s' needs a parameter\n", name);
 202         return -1;
 203     }
 204     return 0;
 205 }
 206
 207 static int parse_option_size(const char *name, const char *value, uint64_t *ret)
 208 {
 209     char *postfix;
 210     double sizef;
 211
 212     if (value != NULL) {
 213         sizef = strtod(value, &postfix);
 214         switch (*postfix) {
 215         case 'T':
 216             sizef *= 1024;
 217         case 'G':
 218             sizef *= 1024;
 219         case 'M':
 220             sizef *= 1024;
 221         case 'K':
 222         case 'k':
 223             sizef *= 1024;
 224         case 'b':
 225         case '\0':
 226             *ret = (uint64_t) sizef;
 227             break;
 228         default:
 229             fprintf(stderr, "Option '%s' needs size as parameter\n", name);
 230             fprintf(stderr, "You may use k, M, G or T suffixes for "
 231                     "kilobytes, megabytes, gigabytes and terabytes.\n");
 232             return -1;
 233         }
 234     } else {
 235         fprintf(stderr, "Option '%s' needs a parameter\n", name);
 236         return -1;
 237     }
 238     return 0;
 239 }
 240
 241 /*
 242  * Sets the value of a parameter in a given option list. The parsing of the
 243  * value depends on the type of option:
 244  *
 245  * OPT_FLAG (uses value.n):
 246  *      If no value is given, the flag is set to 1.
 247  *      Otherwise the value must be "on" (set to 1) or "off" (set to 0)
 248  *
 249  * OPT_STRING (uses value.s):
 250  *      value is strdup()ed and assigned as option value
 251  *
 252  * OPT_SIZE (uses value.n):
 253  *      The value is converted to an integer. Suffixes for kilobytes etc. are
 254  *      allowed (powers of 1024).
 255  *
 256  * Returns 0 on succes, -1 in error cases
 257  */
 258 int set_option_parameter(QEMUOptionParameter *list, const char *name,
 259     const char *value)
 260 {
 261     int flag;
 262
 263     // Find a matching parameter
 264     list = get_option_parameter(list, name);
 265     if (list == NULL) {
 266         fprintf(stderr, "Unknown option '%s'\n", name);
 267         return -1;
 268     }
 269
 270     // Process parameter
 271     switch (list->type) {
 272     case OPT_FLAG:
 273         if (parse_option_bool(name, value, &flag) == -1)
 274             return -1;
 275         list->value.n = flag;
 276         break;
 277
 278     case OPT_STRING:
 279         if (value != NULL) {
 280             list->value.s = qemu_strdup(value);
 281         } else {
 282             fprintf(stderr, "Option '%s' needs a parameter\n", name);
 283             return -1;
 284         }
 285         break;
 286
 287     case OPT_SIZE:
 288         if (parse_option_size(name, value, &list->value.n) == -1)
 289             return -1;
 290         break;
 291
 292     default:
 293         fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
 294         return -1;
 295     }
 296
 297     return 0;
 298 }
 299
 300 /*
 301  * Sets the given parameter to an integer instead of a string.
 302  * This function cannot be used to set string options.
 303  *
 304  * Returns 0 on success, -1 in error cases
 305  */
 306 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
 307     uint64_t value)
 308 {
 309     // Find a matching parameter
 310     list = get_option_parameter(list, name);
 311     if (list == NULL) {
 312         fprintf(stderr, "Unknown option '%s'\n", name);
 313         return -1;
 314     }
 315
 316     // Process parameter
 317     switch (list->type) {
 318     case OPT_FLAG:
 319     case OPT_NUMBER:
 320     case OPT_SIZE:
 321         list->value.n = value;
 322         break;
 323
 324     default:
 325         return -1;
 326     }
 327
 328     return 0;
 329 }
 330
 331 /*
 332  * Frees a option list. If it contains strings, the strings are freed as well.
 333  */
 334 void free_option_parameters(QEMUOptionParameter *list)
 335 {
 336     QEMUOptionParameter *cur = list;
 337
 338     while (cur && cur->name) {
 339         if (cur->type == OPT_STRING) {
 340             qemu_free(cur->value.s);
 341         }
 342         cur++;
 343     }
 344
 345     qemu_free(list);
 346 }
 347
 348 /*
 349  * Parses a parameter string (param) into an option list (dest).
 350  *
 351  * list is the templace is. If dest is NULL, a new copy of list is created for
 352  * it. If list is NULL, this function fails.
 353  *
 354  * A parameter string consists of one or more parameters, separated by commas.
 355  * Each parameter consists of its name and possibly of a value. In the latter
 356  * case, the value is delimited by an = character. To specify a value which
 357  * contains commas, double each comma so it won't be recognized as the end of
 358  * the parameter.
 359  *
 360  * For more details of the parsing see above.
 361  *
 362  * Returns a pointer to the first element of dest (or the newly allocated copy)
 363  * or NULL in error cases
 364  */
 365 QEMUOptionParameter *parse_option_parameters(const char *param,
 366     QEMUOptionParameter *list, QEMUOptionParameter *dest)
 367 {
 368     QEMUOptionParameter *cur;
 369     QEMUOptionParameter *allocated = NULL;
 370     char name[256];
 371     char value[256];
 372     char *param_delim, *value_delim;
 373     char next_delim;
 374     size_t num_options;
 375
 376     if (list == NULL) {
 377         return NULL;
 378     }
 379
 380     if (dest == NULL) {
 381         // Count valid options
 382         num_options = 0;
 383         cur = list;
 384         while (cur->name) {
 385             num_options++;
 386             cur++;
 387         }
 388
 389         // Create a copy of the option list to fill in values
 390         dest = qemu_mallocz((num_options + 1) * sizeof(QEMUOptionParameter));
 391         allocated = dest;
 392         memcpy(dest, list, (num_options + 1) * sizeof(QEMUOptionParameter));
 393     }
 394
 395     while (*param) {
 396
 397         // Find parameter name and value in the string
 398         param_delim = strchr(param, ',');
 399         value_delim = strchr(param, '=');
 400
 401         if (value_delim && (value_delim < param_delim || !param_delim)) {
 402             next_delim = '=';
 403         } else {
 404             next_delim = ',';
 405             value_delim = NULL;
 406         }
 407
 408         param = get_opt_name(name, sizeof(name), param, next_delim);
 409         if (value_delim) {
 410             param = get_opt_value(value, sizeof(value), param + 1);
 411         }
 412         if (*param != '\0') {
 413             param++;
 414         }
 415
 416         // Set the parameter
 417         if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
 418             goto fail;
 419         }
 420     }
 421
 422     return dest;
 423
 424 fail:
 425     // Only free the list if it was newly allocated
 426     free_option_parameters(allocated);
 427     return NULL;
 428 }
 429
 430 /*
 431  * Prints all options of a list that have a value to stdout
 432  */
 433 void print_option_parameters(QEMUOptionParameter *list)
 434 {
 435     while (list && list->name) {
 436         switch (list->type) {
 437             case OPT_STRING:
 438                  if (list->value.s != NULL) {
 439                      printf("%s='%s' ", list->name, list->value.s);
 440                  }
 441                 break;
 442             case OPT_FLAG:
 443                 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
 444                 break;
 445             case OPT_SIZE:
 446             case OPT_NUMBER:
 447                 printf("%s=%" PRId64 " ", list->name, list->value.n);
 448                 break;
 449             default:
 450                 printf("%s=(unkown type) ", list->name);
 451                 break;
 452         }
 453         list++;
 454     }
 455 }
 456
 457 /*
 458  * Prints an overview of all available options
 459  */
 460 void print_option_help(QEMUOptionParameter *list)
 461 {
 462     printf("Supported options:\n");
 463     while (list && list->name) {
 464         printf("%-16s %s\n", list->name,
 465             list->help ? list->help : "No description available");
 466         list++;
 467     }
 468 }
 469
 470 /* ------------------------------------------------------------------ */
 471
 472 struct QemuOpt {
 473     const char   *name;
 474     const char   *str;
 475
 476     const QemuOptDesc *desc;
 477     union {
 478         int      boolean;
 479         uint64_t uint;
 480     } value;
 481
 482     QemuOpts     *opts;
 483     QTAILQ_ENTRY(QemuOpt) next;
 484 };
 485
 486 struct QemuOpts {
 487     char *id;
 488     QemuOptsList *list;
 489     Location loc;
 490     QTAILQ_HEAD(QemuOptHead, QemuOpt) head;
 491     QTAILQ_ENTRY(QemuOpts) next;
 492 };
 493
 494 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 495 {
 496     QemuOpt *opt;
 497
 498     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 499         if (strcmp(opt->name, name) != 0)
 500             continue;
 501         return opt;
 502     }
 503     return NULL;
 504 }
 505
 506 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 507 {
 508     QemuOpt *opt = qemu_opt_find(opts, name);
 509     return opt ? opt->str : NULL;
 510 }
 511
 512 int qemu_opt_get_bool(QemuOpts *opts, const char *name, int defval)
 513 {
 514     QemuOpt *opt = qemu_opt_find(opts, name);
 515
 516     if (opt == NULL)
 517         return defval;
 518     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 519     return opt->value.boolean;
 520 }
 521
 522 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 523 {
 524     QemuOpt *opt = qemu_opt_find(opts, name);
 525
 526     if (opt == NULL)
 527         return defval;
 528     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 529     return opt->value.uint;
 530 }
 531
 532 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 533 {
 534     QemuOpt *opt = qemu_opt_find(opts, name);
 535
 536     if (opt == NULL)
 537         return defval;
 538     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 539     return opt->value.uint;
 540 }
 541
 542 static int qemu_opt_parse(QemuOpt *opt)
 543 {
 544     if (opt->desc == NULL)
 545         return 0;
 546     switch (opt->desc->type) {
 547     case QEMU_OPT_STRING:
 548         /* nothing */
 549         return 0;
 550     case QEMU_OPT_BOOL:
 551         return parse_option_bool(opt->name, opt->str, &opt->value.boolean);
 552     case QEMU_OPT_NUMBER:
 553         return parse_option_number(opt->name, opt->str, &opt->value.uint);
 554     case QEMU_OPT_SIZE:
 555         return parse_option_size(opt->name, opt->str, &opt->value.uint);
 556     default:
 557         abort();
 558     }
 559 }
 560
 561 static void qemu_opt_del(QemuOpt *opt)
 562 {
 563     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 564     qemu_free((/* !const */ char*)opt->name);
 565     qemu_free((/* !const */ char*)opt->str);
 566     qemu_free(opt);
 567 }
 568
 569 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 570 {
 571     QemuOpt *opt;
 572     const QemuOptDesc *desc = opts->list->desc;
 573     int i;
 574
 575     for (i = 0; desc[i].name != NULL; i++) {
 576         if (strcmp(desc[i].name, name) == 0) {
 577             break;
 578         }
 579     }
 580     if (desc[i].name == NULL) {
 581         if (i == 0) {
 582             /* empty list -> allow any */;
 583         } else {
 584             fprintf(stderr, "option \"%s\" is not valid for %s\n",
 585                     name, opts->list->name);
 586             return -1;
 587         }
 588     }
 589
 590     opt = qemu_mallocz(sizeof(*opt));
 591     opt->name = qemu_strdup(name);
 592     opt->opts = opts;
 593     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 594     if (desc[i].name != NULL) {
 595         opt->desc = desc+i;
 596     }
 597     if (value) {
 598         opt->str = qemu_strdup(value);
 599     }
 600     if (qemu_opt_parse(opt) < 0) {
 601         fprintf(stderr, "Failed to parse \"%s\" for \"%s.%s\"\n", opt->str,
 602                 opts->list->name, opt->name);
 603         qemu_opt_del(opt);
 604         return -1;
 605     }
 606     return 0;
 607 }
 608
 609 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 610                      int abort_on_failure)
 611 {
 612     QemuOpt *opt;
 613     int rc = 0;
 614
 615     QTAILQ_FOREACH(opt, &opts->head, next) {
 616         rc = func(opt->name, opt->str, opaque);
 617         if (abort_on_failure  &&  rc != 0)
 618             break;
 619     }
 620     return rc;
 621 }
 622
 623 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 624 {
 625     QemuOpts *opts;
 626
 627     QTAILQ_FOREACH(opts, &list->head, next) {
 628         if (!opts->id) {
 629             continue;
 630         }
 631         if (strcmp(opts->id, id) != 0) {
 632             continue;
 633         }
 634         return opts;
 635     }
 636     return NULL;
 637 }
 638
 639 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id, int fail_if_exists)
 640 {
 641     QemuOpts *opts = NULL;
 642
 643     if (id) {
 644         opts = qemu_opts_find(list, id);
 645         if (opts != NULL) {
 646             if (fail_if_exists) {
 647                 qerror_report(QERR_DUPLICATE_ID, id, list->name);
 648                 return NULL;
 649             } else {
 650                 return opts;
 651             }
 652         }
 653     }
 654     opts = qemu_mallocz(sizeof(*opts));
 655     if (id) {
 656         opts->id = qemu_strdup(id);
 657     }
 658     opts->list = list;
 659     loc_save(&opts->loc);
 660     QTAILQ_INIT(&opts->head);
 661     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 662     return opts;
 663 }
 664
 665 int qemu_opts_set(QemuOptsList *list, const char *id,
 666                   const char *name, const char *value)
 667 {
 668     QemuOpts *opts;
 669
 670     opts = qemu_opts_create(list, id, 1);
 671     if (opts == NULL) {
 672         return -1;
 673     }
 674     return qemu_opt_set(opts, name, value);
 675 }
 676
 677 const char *qemu_opts_id(QemuOpts *opts)
 678 {
 679     return opts->id;
 680 }
 681
 682 void qemu_opts_del(QemuOpts *opts)
 683 {
 684     QemuOpt *opt;
 685
 686     for (;;) {
 687         opt = QTAILQ_FIRST(&opts->head);
 688         if (opt == NULL)
 689             break;
 690         qemu_opt_del(opt);
 691     }
 692     QTAILQ_REMOVE(&opts->list->head, opts, next);
 693     qemu_free(opts->id);
 694     qemu_free(opts);
 695 }
 696
 697 int qemu_opts_print(QemuOpts *opts, void *dummy)
 698 {
 699     QemuOpt *opt;
 700
 701     fprintf(stderr, "%s: %s:", opts->list->name,
 702             opts->id ? opts->id : "<noid>");
 703     QTAILQ_FOREACH(opt, &opts->head, next) {
 704         fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
 705     }
 706     fprintf(stderr, "\n");
 707     return 0;
 708 }
 709
 710 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 711 {
 712     char option[128], value[1024];
 713     const char *p,*pe,*pc;
 714
 715     for (p = params; *p != '\0'; p++) {
 716         pe = strchr(p, '=');
 717         pc = strchr(p, ',');
 718         if (!pe || (pc && pc < pe)) {
 719             /* found "foo,more" */
 720             if (p == params && firstname) {
 721                 /* implicitly named first option */
 722                 pstrcpy(option, sizeof(option), firstname);
 723                 p = get_opt_value(value, sizeof(value), p);
 724             } else {
 725                 /* option without value, probably a flag */
 726                 p = get_opt_name(option, sizeof(option), p, ',');
 727                 if (strncmp(option, "no", 2) == 0) {
 728                     memmove(option, option+2, strlen(option+2)+1);
 729                     pstrcpy(value, sizeof(value), "off");
 730                 } else {
 731                     pstrcpy(value, sizeof(value), "on");
 732                 }
 733             }
 734         } else {
 735             /* found "foo=bar,more" */
 736             p = get_opt_name(option, sizeof(option), p, '=');
 737             if (*p != '=') {
 738                 break;
 739             }
 740             p++;
 741             p = get_opt_value(value, sizeof(value), p);
 742         }
 743         if (strcmp(option, "id") != 0) {
 744             /* store and parse */
 745             if (qemu_opt_set(opts, option, value) == -1) {
 746                 return -1;
 747             }
 748         }
 749         if (*p != ',') {
 750             break;
 751         }
 752     }
 753     return 0;
 754 }
 755
 756 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 757                           int permit_abbrev)
 758 {
 759     const char *firstname;
 760     char value[1024], *id = NULL;
 761     const char *p;
 762     QemuOpts *opts;
 763
 764     assert(!permit_abbrev || list->implied_opt_name);
 765     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 766
 767     if (strncmp(params, "id=", 3) == 0) {
 768         get_opt_value(value, sizeof(value), params+3);
 769         id = qemu_strdup(value);
 770     } else if ((p = strstr(params, ",id=")) != NULL) {
 771         get_opt_value(value, sizeof(value), p+4);
 772         id = qemu_strdup(value);
 773     }
 774     opts = qemu_opts_create(list, id, 1);
 775     if (opts == NULL)
 776         return NULL;
 777
 778     if (qemu_opts_do_parse(opts, params, firstname) != 0) {
 779         qemu_opts_del(opts);
 780         return NULL;
 781     }
 782
 783     return opts;
 784 }
 785
 786 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 787 {
 788     char buf[32];
 789     const char *value;
 790     int n;
 791
 792     if (!strcmp(key, "id")) {
 793         return;
 794     }
 795
 796     switch (qobject_type(obj)) {
 797     case QTYPE_QSTRING:
 798         value = qstring_get_str(qobject_to_qstring(obj));
 799         break;
 800     case QTYPE_QINT:
 801         n = snprintf(buf, sizeof(buf), "%" PRId64,
 802                      qint_get_int(qobject_to_qint(obj)));
 803         assert(n < sizeof(buf));
 804         value = buf;
 805         break;
 806     case QTYPE_QFLOAT:
 807         n = snprintf(buf, sizeof(buf), "%.17g",
 808                      qfloat_get_double(qobject_to_qfloat(obj)));
 809         assert(n < sizeof(buf));
 810         value = buf;
 811         break;
 812     case QTYPE_QBOOL:
 813         pstrcpy(buf, sizeof(buf),
 814                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
 815         value = buf;
 816         break;
 817     default:
 818         return;
 819     }
 820     qemu_opt_set(opaque, key, value);
 821 }
 822
 823 /*
 824  * Create QemuOpts from a QDict.
 825  * Use value of key "id" as ID if it exists and is a QString.
 826  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
 827  * other types are silently ignored.
 828  */
 829 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict)
 830 {
 831     QemuOpts *opts;
 832
 833     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1);
 834     if (opts == NULL)
 835         return NULL;
 836
 837     qdict_iter(qdict, qemu_opts_from_qdict_1, opts);
 838     return opts;
 839 }
 840
 841 /*
 842  * Convert from QemuOpts to QDict.
 843  * The QDict values are of type QString.
 844  * TODO We'll want to use types appropriate for opt->desc->type, but
 845  * this is enough for now.
 846  */
 847 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
 848 {
 849     QemuOpt *opt;
 850     QObject *val;
 851
 852     if (!qdict) {
 853         qdict = qdict_new();
 854     }
 855     if (opts->id) {
 856         qdict_put(qdict, "id", qstring_from_str(opts->id));
 857     }
 858     QTAILQ_FOREACH(opt, &opts->head, next) {
 859         val = QOBJECT(qstring_from_str(opt->str));
 860         qdict_put_obj(qdict, opt->name, val);
 861     }
 862     return qdict;
 863 }
 864
 865 /* Validate parsed opts against descriptions where no
 866  * descriptions were provided in the QemuOptsList.
 867  */
 868 int qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc)
 869 {
 870     QemuOpt *opt;
 871
 872     assert(opts->list->desc[0].name == NULL);
 873
 874     QTAILQ_FOREACH(opt, &opts->head, next) {
 875         int i;
 876
 877         for (i = 0; desc[i].name != NULL; i++) {
 878             if (strcmp(desc[i].name, opt->name) == 0) {
 879                 break;
 880             }
 881         }
 882         if (desc[i].name == NULL) {
 883             fprintf(stderr, "option \"%s\" is not valid for %s\n",
 884                     opt->name, opts->list->name);
 885             return -1;
 886         }
 887
 888         opt->desc = &desc[i];
 889
 890         if (qemu_opt_parse(opt) < 0) {
 891             return -1;
 892         }
 893     }
 894
 895     return 0;
 896 }
 897
 898 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
 899                       int abort_on_failure)
 900 {
 901     Location loc;
 902     QemuOpts *opts;
 903     int rc = 0;
 904
 905     loc_push_none(&loc);
 906     QTAILQ_FOREACH(opts, &list->head, next) {
 907         loc_restore(&opts->loc);
 908         rc |= func(opts, opaque);
 909         if (abort_on_failure  &&  rc != 0)
 910             break;
 911     }
 912     loc_pop(&loc);
 913     return rc;
 914 }