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