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, bool *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             qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
 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             qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a number");
 197             return -1;
 198         }
 199         *ret = number;
 200     } else {
 201         qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a number");
 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             /* fall through */
 218         case 'G':
 219             sizef *= 1024;
 220             /* fall through */
 221         case 'M':
 222             sizef *= 1024;
 223             /* fall through */
 224         case 'K':
 225         case 'k':
 226             sizef *= 1024;
 227             /* fall through */
 228         case 'b':
 229         case '\0':
 230             *ret = (uint64_t) sizef;
 231             break;
 232         default:
 233             qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
 234             error_printf_unless_qmp("You may use k, M, G or T suffixes for "
 235                     "kilobytes, megabytes, gigabytes and terabytes.\n");
 236             return -1;
 237         }
 238     } else {
 239         qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
 240         return -1;
 241     }
 242     return 0;
 243 }
 244
 245 /*
 246  * Sets the value of a parameter in a given option list. The parsing of the
 247  * value depends on the type of option:
 248  *
 249  * OPT_FLAG (uses value.n):
 250  *      If no value is given, the flag is set to 1.
 251  *      Otherwise the value must be "on" (set to 1) or "off" (set to 0)
 252  *
 253  * OPT_STRING (uses value.s):
 254  *      value is strdup()ed and assigned as option value
 255  *
 256  * OPT_SIZE (uses value.n):
 257  *      The value is converted to an integer. Suffixes for kilobytes etc. are
 258  *      allowed (powers of 1024).
 259  *
 260  * Returns 0 on succes, -1 in error cases
 261  */
 262 int set_option_parameter(QEMUOptionParameter *list, const char *name,
 263     const char *value)
 264 {
 265     bool flag;
 266
 267     // Find a matching parameter
 268     list = get_option_parameter(list, name);
 269     if (list == NULL) {
 270         fprintf(stderr, "Unknown option '%s'\n", name);
 271         return -1;
 272     }
 273
 274     // Process parameter
 275     switch (list->type) {
 276     case OPT_FLAG:
 277         if (parse_option_bool(name, value, &flag) == -1)
 278             return -1;
 279         list->value.n = flag;
 280         break;
 281
 282     case OPT_STRING:
 283         if (value != NULL) {
 284             list->value.s = g_strdup(value);
 285         } else {
 286             fprintf(stderr, "Option '%s' needs a parameter\n", name);
 287             return -1;
 288         }
 289         break;
 290
 291     case OPT_SIZE:
 292         if (parse_option_size(name, value, &list->value.n) == -1)
 293             return -1;
 294         break;
 295
 296     default:
 297         fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
 298         return -1;
 299     }
 300
 301     return 0;
 302 }
 303
 304 /*
 305  * Sets the given parameter to an integer instead of a string.
 306  * This function cannot be used to set string options.
 307  *
 308  * Returns 0 on success, -1 in error cases
 309  */
 310 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
 311     uint64_t value)
 312 {
 313     // Find a matching parameter
 314     list = get_option_parameter(list, name);
 315     if (list == NULL) {
 316         fprintf(stderr, "Unknown option '%s'\n", name);
 317         return -1;
 318     }
 319
 320     // Process parameter
 321     switch (list->type) {
 322     case OPT_FLAG:
 323     case OPT_NUMBER:
 324     case OPT_SIZE:
 325         list->value.n = value;
 326         break;
 327
 328     default:
 329         return -1;
 330     }
 331
 332     return 0;
 333 }
 334
 335 /*
 336  * Frees a option list. If it contains strings, the strings are freed as well.
 337  */
 338 void free_option_parameters(QEMUOptionParameter *list)
 339 {
 340     QEMUOptionParameter *cur = list;
 341
 342     while (cur && cur->name) {
 343         if (cur->type == OPT_STRING) {
 344             g_free(cur->value.s);
 345         }
 346         cur++;
 347     }
 348
 349     g_free(list);
 350 }
 351
 352 /*
 353  * Count valid options in list
 354  */
 355 static size_t count_option_parameters(QEMUOptionParameter *list)
 356 {
 357     size_t num_options = 0;
 358
 359     while (list && list->name) {
 360         num_options++;
 361         list++;
 362     }
 363
 364     return num_options;
 365 }
 366
 367 /*
 368  * Append an option list (list) to an option list (dest).
 369  *
 370  * If dest is NULL, a new copy of list is created.
 371  *
 372  * Returns a pointer to the first element of dest (or the newly allocated copy)
 373  */
 374 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
 375     QEMUOptionParameter *list)
 376 {
 377     size_t num_options, num_dest_options;
 378
 379     num_options = count_option_parameters(dest);
 380     num_dest_options = num_options;
 381
 382     num_options += count_option_parameters(list);
 383
 384     dest = g_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
 385     dest[num_dest_options].name = NULL;
 386
 387     while (list && list->name) {
 388         if (get_option_parameter(dest, list->name) == NULL) {
 389             dest[num_dest_options++] = *list;
 390             dest[num_dest_options].name = NULL;
 391         }
 392         list++;
 393     }
 394
 395     return dest;
 396 }
 397
 398 /*
 399  * Parses a parameter string (param) into an option list (dest).
 400  *
 401  * list is the template option list. If dest is NULL, a new copy of list is
 402  * created. If list is NULL, this function fails.
 403  *
 404  * A parameter string consists of one or more parameters, separated by commas.
 405  * Each parameter consists of its name and possibly of a value. In the latter
 406  * case, the value is delimited by an = character. To specify a value which
 407  * contains commas, double each comma so it won't be recognized as the end of
 408  * the parameter.
 409  *
 410  * For more details of the parsing see above.
 411  *
 412  * Returns a pointer to the first element of dest (or the newly allocated copy)
 413  * or NULL in error cases
 414  */
 415 QEMUOptionParameter *parse_option_parameters(const char *param,
 416     QEMUOptionParameter *list, QEMUOptionParameter *dest)
 417 {
 418     QEMUOptionParameter *allocated = NULL;
 419     char name[256];
 420     char value[256];
 421     char *param_delim, *value_delim;
 422     char next_delim;
 423
 424     if (list == NULL) {
 425         return NULL;
 426     }
 427
 428     if (dest == NULL) {
 429         dest = allocated = append_option_parameters(NULL, list);
 430     }
 431
 432     while (*param) {
 433
 434         // Find parameter name and value in the string
 435         param_delim = strchr(param, ',');
 436         value_delim = strchr(param, '=');
 437
 438         if (value_delim && (value_delim < param_delim || !param_delim)) {
 439             next_delim = '=';
 440         } else {
 441             next_delim = ',';
 442             value_delim = NULL;
 443         }
 444
 445         param = get_opt_name(name, sizeof(name), param, next_delim);
 446         if (value_delim) {
 447             param = get_opt_value(value, sizeof(value), param + 1);
 448         }
 449         if (*param != '\0') {
 450             param++;
 451         }
 452
 453         // Set the parameter
 454         if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
 455             goto fail;
 456         }
 457     }
 458
 459     return dest;
 460
 461 fail:
 462     // Only free the list if it was newly allocated
 463     free_option_parameters(allocated);
 464     return NULL;
 465 }
 466
 467 /*
 468  * Prints all options of a list that have a value to stdout
 469  */
 470 void print_option_parameters(QEMUOptionParameter *list)
 471 {
 472     while (list && list->name) {
 473         switch (list->type) {
 474             case OPT_STRING:
 475                  if (list->value.s != NULL) {
 476                      printf("%s='%s' ", list->name, list->value.s);
 477                  }
 478                 break;
 479             case OPT_FLAG:
 480                 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
 481                 break;
 482             case OPT_SIZE:
 483             case OPT_NUMBER:
 484                 printf("%s=%" PRId64 " ", list->name, list->value.n);
 485                 break;
 486             default:
 487                 printf("%s=(unknown type) ", list->name);
 488                 break;
 489         }
 490         list++;
 491     }
 492 }
 493
 494 /*
 495  * Prints an overview of all available options
 496  */
 497 void print_option_help(QEMUOptionParameter *list)
 498 {
 499     printf("Supported options:\n");
 500     while (list && list->name) {
 501         printf("%-16s %s\n", list->name,
 502             list->help ? list->help : "No description available");
 503         list++;
 504     }
 505 }
 506
 507 /* ------------------------------------------------------------------ */
 508
 509 struct QemuOpt {
 510     const char   *name;
 511     const char   *str;
 512
 513     const QemuOptDesc *desc;
 514     union {
 515         bool boolean;
 516         uint64_t uint;
 517     } value;
 518
 519     QemuOpts     *opts;
 520     QTAILQ_ENTRY(QemuOpt) next;
 521 };
 522
 523 struct QemuOpts {
 524     char *id;
 525     QemuOptsList *list;
 526     Location loc;
 527     QTAILQ_HEAD(QemuOptHead, QemuOpt) head;
 528     QTAILQ_ENTRY(QemuOpts) next;
 529 };
 530
 531 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 532 {
 533     QemuOpt *opt;
 534
 535     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 536         if (strcmp(opt->name, name) != 0)
 537             continue;
 538         return opt;
 539     }
 540     return NULL;
 541 }
 542
 543 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 544 {
 545     QemuOpt *opt = qemu_opt_find(opts, name);
 546     return opt ? opt->str : NULL;
 547 }
 548
 549 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 550 {
 551     QemuOpt *opt = qemu_opt_find(opts, name);
 552
 553     if (opt == NULL)
 554         return defval;
 555     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 556     return opt->value.boolean;
 557 }
 558
 559 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 560 {
 561     QemuOpt *opt = qemu_opt_find(opts, name);
 562
 563     if (opt == NULL)
 564         return defval;
 565     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 566     return opt->value.uint;
 567 }
 568
 569 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 570 {
 571     QemuOpt *opt = qemu_opt_find(opts, name);
 572
 573     if (opt == NULL)
 574         return defval;
 575     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 576     return opt->value.uint;
 577 }
 578
 579 static int qemu_opt_parse(QemuOpt *opt)
 580 {
 581     if (opt->desc == NULL)
 582         return 0;
 583     switch (opt->desc->type) {
 584     case QEMU_OPT_STRING:
 585         /* nothing */
 586         return 0;
 587     case QEMU_OPT_BOOL:
 588         return parse_option_bool(opt->name, opt->str, &opt->value.boolean);
 589     case QEMU_OPT_NUMBER:
 590         return parse_option_number(opt->name, opt->str, &opt->value.uint);
 591     case QEMU_OPT_SIZE:
 592         return parse_option_size(opt->name, opt->str, &opt->value.uint);
 593     default:
 594         abort();
 595     }
 596 }
 597
 598 static void qemu_opt_del(QemuOpt *opt)
 599 {
 600     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 601     g_free((/* !const */ char*)opt->name);
 602     g_free((/* !const */ char*)opt->str);
 603     g_free(opt);
 604 }
 605
 606 static int opt_set(QemuOpts *opts, const char *name, const char *value,
 607                    bool prepend)
 608 {
 609     QemuOpt *opt;
 610     const QemuOptDesc *desc = opts->list->desc;
 611     int i;
 612
 613     for (i = 0; desc[i].name != NULL; i++) {
 614         if (strcmp(desc[i].name, name) == 0) {
 615             break;
 616         }
 617     }
 618     if (desc[i].name == NULL) {
 619         if (i == 0) {
 620             /* empty list -> allow any */;
 621         } else {
 622             qerror_report(QERR_INVALID_PARAMETER, name);
 623             return -1;
 624         }
 625     }
 626
 627     opt = g_malloc0(sizeof(*opt));
 628     opt->name = g_strdup(name);
 629     opt->opts = opts;
 630     if (prepend) {
 631         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 632     } else {
 633         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 634     }
 635     if (desc[i].name != NULL) {
 636         opt->desc = desc+i;
 637     }
 638     if (value) {
 639         opt->str = g_strdup(value);
 640     }
 641     if (qemu_opt_parse(opt) < 0) {
 642         qemu_opt_del(opt);
 643         return -1;
 644     }
 645     return 0;
 646 }
 647
 648 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 649 {
 650     return opt_set(opts, name, value, false);
 651 }
 652
 653 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 654 {
 655     QemuOpt *opt;
 656     const QemuOptDesc *desc = opts->list->desc;
 657     int i;
 658
 659     for (i = 0; desc[i].name != NULL; i++) {
 660         if (strcmp(desc[i].name, name) == 0) {
 661             break;
 662         }
 663     }
 664     if (desc[i].name == NULL) {
 665         if (i == 0) {
 666             /* empty list -> allow any */;
 667         } else {
 668             qerror_report(QERR_INVALID_PARAMETER, name);
 669             return -1;
 670         }
 671     }
 672
 673     opt = g_malloc0(sizeof(*opt));
 674     opt->name = g_strdup(name);
 675     opt->opts = opts;
 676     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 677     if (desc[i].name != NULL) {
 678         opt->desc = desc+i;
 679     }
 680     opt->value.boolean = !!val;
 681     return 0;
 682 }
 683
 684 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 685                      int abort_on_failure)
 686 {
 687     QemuOpt *opt;
 688     int rc = 0;
 689
 690     QTAILQ_FOREACH(opt, &opts->head, next) {
 691         rc = func(opt->name, opt->str, opaque);
 692         if (abort_on_failure  &&  rc != 0)
 693             break;
 694     }
 695     return rc;
 696 }
 697
 698 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 699 {
 700     QemuOpts *opts;
 701
 702     QTAILQ_FOREACH(opts, &list->head, next) {
 703         if (!opts->id) {
 704             if (!id) {
 705                 return opts;
 706             }
 707             continue;
 708         }
 709         if (strcmp(opts->id, id) != 0) {
 710             continue;
 711         }
 712         return opts;
 713     }
 714     return NULL;
 715 }
 716
 717 static int id_wellformed(const char *id)
 718 {
 719     int i;
 720
 721     if (!qemu_isalpha(id[0])) {
 722         return 0;
 723     }
 724     for (i = 1; id[i]; i++) {
 725         if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
 726             return 0;
 727         }
 728     }
 729     return 1;
 730 }
 731
 732 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id, int fail_if_exists)
 733 {
 734     QemuOpts *opts = NULL;
 735
 736     if (id) {
 737         if (!id_wellformed(id)) {
 738             qerror_report(QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
 739             error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
 740             return NULL;
 741         }
 742         opts = qemu_opts_find(list, id);
 743         if (opts != NULL) {
 744             if (fail_if_exists) {
 745                 qerror_report(QERR_DUPLICATE_ID, id, list->name);
 746                 return NULL;
 747             } else {
 748                 return opts;
 749             }
 750         }
 751     }
 752     opts = g_malloc0(sizeof(*opts));
 753     if (id) {
 754         opts->id = g_strdup(id);
 755     }
 756     opts->list = list;
 757     loc_save(&opts->loc);
 758     QTAILQ_INIT(&opts->head);
 759     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 760     return opts;
 761 }
 762
 763 void qemu_opts_reset(QemuOptsList *list)
 764 {
 765     QemuOpts *opts, *next_opts;
 766
 767     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 768         qemu_opts_del(opts);
 769     }
 770 }
 771
 772 void qemu_opts_loc_restore(QemuOpts *opts)
 773 {
 774     loc_restore(&opts->loc);
 775 }
 776
 777 int qemu_opts_set(QemuOptsList *list, const char *id,
 778                   const char *name, const char *value)
 779 {
 780     QemuOpts *opts;
 781
 782     opts = qemu_opts_create(list, id, 1);
 783     if (opts == NULL) {
 784         return -1;
 785     }
 786     return qemu_opt_set(opts, name, value);
 787 }
 788
 789 const char *qemu_opts_id(QemuOpts *opts)
 790 {
 791     return opts->id;
 792 }
 793
 794 void qemu_opts_del(QemuOpts *opts)
 795 {
 796     QemuOpt *opt;
 797
 798     for (;;) {
 799         opt = QTAILQ_FIRST(&opts->head);
 800         if (opt == NULL)
 801             break;
 802         qemu_opt_del(opt);
 803     }
 804     QTAILQ_REMOVE(&opts->list->head, opts, next);
 805     g_free(opts->id);
 806     g_free(opts);
 807 }
 808
 809 int qemu_opts_print(QemuOpts *opts, void *dummy)
 810 {
 811     QemuOpt *opt;
 812
 813     fprintf(stderr, "%s: %s:", opts->list->name,
 814             opts->id ? opts->id : "<noid>");
 815     QTAILQ_FOREACH(opt, &opts->head, next) {
 816         fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
 817     }
 818     fprintf(stderr, "\n");
 819     return 0;
 820 }
 821
 822 static int opts_do_parse(QemuOpts *opts, const char *params,
 823                          const char *firstname, bool prepend)
 824 {
 825     char option[128], value[1024];
 826     const char *p,*pe,*pc;
 827
 828     for (p = params; *p != '\0'; p++) {
 829         pe = strchr(p, '=');
 830         pc = strchr(p, ',');
 831         if (!pe || (pc && pc < pe)) {
 832             /* found "foo,more" */
 833             if (p == params && firstname) {
 834                 /* implicitly named first option */
 835                 pstrcpy(option, sizeof(option), firstname);
 836                 p = get_opt_value(value, sizeof(value), p);
 837             } else {
 838                 /* option without value, probably a flag */
 839                 p = get_opt_name(option, sizeof(option), p, ',');
 840                 if (strncmp(option, "no", 2) == 0) {
 841                     memmove(option, option+2, strlen(option+2)+1);
 842                     pstrcpy(value, sizeof(value), "off");
 843                 } else {
 844                     pstrcpy(value, sizeof(value), "on");
 845                 }
 846             }
 847         } else {
 848             /* found "foo=bar,more" */
 849             p = get_opt_name(option, sizeof(option), p, '=');
 850             if (*p != '=') {
 851                 break;
 852             }
 853             p++;
 854             p = get_opt_value(value, sizeof(value), p);
 855         }
 856         if (strcmp(option, "id") != 0) {
 857             /* store and parse */
 858             if (opt_set(opts, option, value, prepend) == -1) {
 859                 return -1;
 860             }
 861         }
 862         if (*p != ',') {
 863             break;
 864         }
 865     }
 866     return 0;
 867 }
 868
 869 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 870 {
 871     return opts_do_parse(opts, params, firstname, false);
 872 }
 873
 874 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 875                             int permit_abbrev, bool defaults)
 876 {
 877     const char *firstname;
 878     char value[1024], *id = NULL;
 879     const char *p;
 880     QemuOpts *opts;
 881
 882     assert(!permit_abbrev || list->implied_opt_name);
 883     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 884
 885     if (strncmp(params, "id=", 3) == 0) {
 886         get_opt_value(value, sizeof(value), params+3);
 887         id = value;
 888     } else if ((p = strstr(params, ",id=")) != NULL) {
 889         get_opt_value(value, sizeof(value), p+4);
 890         id = value;
 891     }
 892     if (defaults) {
 893         if (!id && !QTAILQ_EMPTY(&list->head)) {
 894             opts = qemu_opts_find(list, NULL);
 895         } else {
 896             opts = qemu_opts_create(list, id, 0);
 897         }
 898     } else {
 899         opts = qemu_opts_create(list, id, 1);
 900     }
 901     if (opts == NULL)
 902         return NULL;
 903
 904     if (opts_do_parse(opts, params, firstname, defaults) != 0) {
 905         qemu_opts_del(opts);
 906         return NULL;
 907     }
 908
 909     return opts;
 910 }
 911
 912 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 913                           int permit_abbrev)
 914 {
 915     return opts_parse(list, params, permit_abbrev, false);
 916 }
 917
 918 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 919                             int permit_abbrev)
 920 {
 921     QemuOpts *opts;
 922
 923     opts = opts_parse(list, params, permit_abbrev, true);
 924     assert(opts);
 925 }
 926
 927 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 928 {
 929     char buf[32];
 930     const char *value;
 931     int n;
 932
 933     if (!strcmp(key, "id")) {
 934         return;
 935     }
 936
 937     switch (qobject_type(obj)) {
 938     case QTYPE_QSTRING:
 939         value = qstring_get_str(qobject_to_qstring(obj));
 940         break;
 941     case QTYPE_QINT:
 942         n = snprintf(buf, sizeof(buf), "%" PRId64,
 943                      qint_get_int(qobject_to_qint(obj)));
 944         assert(n < sizeof(buf));
 945         value = buf;
 946         break;
 947     case QTYPE_QFLOAT:
 948         n = snprintf(buf, sizeof(buf), "%.17g",
 949                      qfloat_get_double(qobject_to_qfloat(obj)));
 950         assert(n < sizeof(buf));
 951         value = buf;
 952         break;
 953     case QTYPE_QBOOL:
 954         pstrcpy(buf, sizeof(buf),
 955                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
 956         value = buf;
 957         break;
 958     default:
 959         return;
 960     }
 961     qemu_opt_set(opaque, key, value);
 962 }
 963
 964 /*
 965  * Create QemuOpts from a QDict.
 966  * Use value of key "id" as ID if it exists and is a QString.
 967  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
 968  * other types are silently ignored.
 969  */
 970 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict)
 971 {
 972     QemuOpts *opts;
 973
 974     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1);
 975     if (opts == NULL)
 976         return NULL;
 977
 978     qdict_iter(qdict, qemu_opts_from_qdict_1, opts);
 979     return opts;
 980 }
 981
 982 /*
 983  * Convert from QemuOpts to QDict.
 984  * The QDict values are of type QString.
 985  * TODO We'll want to use types appropriate for opt->desc->type, but
 986  * this is enough for now.
 987  */
 988 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
 989 {
 990     QemuOpt *opt;
 991     QObject *val;
 992
 993     if (!qdict) {
 994         qdict = qdict_new();
 995     }
 996     if (opts->id) {
 997         qdict_put(qdict, "id", qstring_from_str(opts->id));
 998     }
 999     QTAILQ_FOREACH(opt, &opts->head, next) {
1000         val = QOBJECT(qstring_from_str(opt->str));
1001         qdict_put_obj(qdict, opt->name, val);
1002     }
1003     return qdict;
1004 }
1005
1006 /* Validate parsed opts against descriptions where no
1007  * descriptions were provided in the QemuOptsList.
1008  */
1009 int qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc)
1010 {
1011     QemuOpt *opt;
1012
1013     assert(opts->list->desc[0].name == NULL);
1014
1015     QTAILQ_FOREACH(opt, &opts->head, next) {
1016         int i;
1017
1018         for (i = 0; desc[i].name != NULL; i++) {
1019             if (strcmp(desc[i].name, opt->name) == 0) {
1020                 break;
1021             }
1022         }
1023         if (desc[i].name == NULL) {
1024             qerror_report(QERR_INVALID_PARAMETER, opt->name);
1025             return -1;
1026         }
1027
1028         opt->desc = &desc[i];
1029
1030         if (qemu_opt_parse(opt) < 0) {
1031             return -1;
1032         }
1033     }
1034
1035     return 0;
1036 }
1037
1038 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1039                       int abort_on_failure)
1040 {
1041     Location loc;
1042     QemuOpts *opts;
1043     int rc = 0;
1044
1045     loc_push_none(&loc);
1046     QTAILQ_FOREACH(opts, &list->head, next) {
1047         loc_restore(&opts->loc);
1048         rc |= func(opts, opaque);
1049         if (abort_on_failure  &&  rc != 0)
1050             break;
1051     }
1052     loc_pop(&loc);
1053     return rc;
1054 }