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