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-report.h"
  31 #include "qapi/qmp/types.h"
  32 #include "qapi/error.h"
  33 #include "qapi/qmp/qerror.h"
  34 #include "qemu/option_int.h"
  35
  36 /*
  37  * Extracts the name of an option from the parameter string (p points at the
  38  * first byte of the option name)
  39  *
  40  * The option name is delimited by delim (usually , or =) or the string end
  41  * and is copied into buf. If the option name is longer than buf_size, it is
  42  * truncated. buf is always zero terminated.
  43  *
  44  * The return value is the position of the delimiter/zero byte after the option
  45  * name in p.
  46  */
  47 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim)
  48 {
  49     char *q;
  50
  51     q = buf;
  52     while (*p != '\0' && *p != delim) {
  53         if (q && (q - buf) < buf_size - 1)
  54             *q++ = *p;
  55         p++;
  56     }
  57     if (q)
  58         *q = '\0';
  59
  60     return p;
  61 }
  62
  63 /*
  64  * Extracts the value of an option from the parameter string p (p points at the
  65  * first byte of the option value)
  66  *
  67  * This function is comparable to get_opt_name with the difference that the
  68  * delimiter is fixed to be comma which starts a new option. To specify an
  69  * option value that contains commas, double each comma.
  70  */
  71 const char *get_opt_value(char *buf, int buf_size, const char *p)
  72 {
  73     char *q;
  74
  75     q = buf;
  76     while (*p != '\0') {
  77         if (*p == ',') {
  78             if (*(p + 1) != ',')
  79                 break;
  80             p++;
  81         }
  82         if (q && (q - buf) < buf_size - 1)
  83             *q++ = *p;
  84         p++;
  85     }
  86     if (q)
  87         *q = '\0';
  88
  89     return p;
  90 }
  91
  92 int get_next_param_value(char *buf, int buf_size,
  93                          const char *tag, const char **pstr)
  94 {
  95     const char *p;
  96     char option[128];
  97
  98     p = *pstr;
  99     for(;;) {
 100         p = get_opt_name(option, sizeof(option), p, '=');
 101         if (*p != '=')
 102             break;
 103         p++;
 104         if (!strcmp(tag, option)) {
 105             *pstr = get_opt_value(buf, buf_size, p);
 106             if (**pstr == ',') {
 107                 (*pstr)++;
 108             }
 109             return strlen(buf);
 110         } else {
 111             p = get_opt_value(NULL, 0, p);
 112         }
 113         if (*p != ',')
 114             break;
 115         p++;
 116     }
 117     return 0;
 118 }
 119
 120 int get_param_value(char *buf, int buf_size,
 121                     const char *tag, const char *str)
 122 {
 123     return get_next_param_value(buf, buf_size, tag, &str);
 124 }
 125
 126 int check_params(char *buf, int buf_size,
 127                  const char * const *params, const char *str)
 128 {
 129     const char *p;
 130     int i;
 131
 132     p = str;
 133     while (*p != '\0') {
 134         p = get_opt_name(buf, buf_size, p, '=');
 135         if (*p != '=') {
 136             return -1;
 137         }
 138         p++;
 139         for (i = 0; params[i] != NULL; i++) {
 140             if (!strcmp(params[i], buf)) {
 141                 break;
 142             }
 143         }
 144         if (params[i] == NULL) {
 145             return -1;
 146         }
 147         p = get_opt_value(NULL, 0, p);
 148         if (*p != ',') {
 149             break;
 150         }
 151         p++;
 152     }
 153     return 0;
 154 }
 155
 156 /*
 157  * Searches an option list for an option with the given name
 158  */
 159 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
 160     const char *name)
 161 {
 162     while (list && list->name) {
 163         if (!strcmp(list->name, name)) {
 164             return list;
 165         }
 166         list++;
 167     }
 168
 169     return NULL;
 170 }
 171
 172 static void parse_option_bool(const char *name, const char *value, bool *ret,
 173                               Error **errp)
 174 {
 175     if (value != NULL) {
 176         if (!strcmp(value, "on")) {
 177             *ret = 1;
 178         } else if (!strcmp(value, "off")) {
 179             *ret = 0;
 180         } else {
 181             error_set(errp,QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
 182         }
 183     } else {
 184         *ret = 1;
 185     }
 186 }
 187
 188 static void parse_option_number(const char *name, const char *value,
 189                                 uint64_t *ret, Error **errp)
 190 {
 191     char *postfix;
 192     uint64_t number;
 193
 194     if (value != NULL) {
 195         number = strtoull(value, &postfix, 0);
 196         if (*postfix != '\0') {
 197             error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 198             return;
 199         }
 200         *ret = number;
 201     } else {
 202         error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 203     }
 204 }
 205
 206 static void parse_option_size(const char *name, const char *value,
 207                               uint64_t *ret, Error **errp)
 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             error_set(errp, 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;
 237         }
 238     } else {
 239         error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
 240     }
 241 }
 242
 243 /*
 244  * Sets the value of a parameter in a given option list. The parsing of the
 245  * value depends on the type of option:
 246  *
 247  * OPT_FLAG (uses value.n):
 248  *      If no value is given, the flag is set to 1.
 249  *      Otherwise the value must be "on" (set to 1) or "off" (set to 0)
 250  *
 251  * OPT_STRING (uses value.s):
 252  *      value is strdup()ed and assigned as option value
 253  *
 254  * OPT_SIZE (uses value.n):
 255  *      The value is converted to an integer. Suffixes for kilobytes etc. are
 256  *      allowed (powers of 1024).
 257  *
 258  * Returns 0 on succes, -1 in error cases
 259  */
 260 int set_option_parameter(QEMUOptionParameter *list, const char *name,
 261     const char *value)
 262 {
 263     bool flag;
 264     Error *local_err = NULL;
 265
 266     // Find a matching parameter
 267     list = get_option_parameter(list, name);
 268     if (list == NULL) {
 269         fprintf(stderr, "Unknown option '%s'\n", name);
 270         return -1;
 271     }
 272
 273     // Process parameter
 274     switch (list->type) {
 275     case OPT_FLAG:
 276         parse_option_bool(name, value, &flag, &local_err);
 277         if (!error_is_set(&local_err)) {
 278             list->value.n = flag;
 279         }
 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         parse_option_size(name, value, &list->value.n, &local_err);
 293         break;
 294
 295     default:
 296         fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
 297         return -1;
 298     }
 299
 300     if (error_is_set(&local_err)) {
 301         qerror_report_err(local_err);
 302         error_free(local_err);
 303         return -1;
 304     }
 305
 306     return 0;
 307 }
 308
 309 /*
 310  * Sets the given parameter to an integer instead of a string.
 311  * This function cannot be used to set string options.
 312  *
 313  * Returns 0 on success, -1 in error cases
 314  */
 315 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
 316     uint64_t value)
 317 {
 318     // Find a matching parameter
 319     list = get_option_parameter(list, name);
 320     if (list == NULL) {
 321         fprintf(stderr, "Unknown option '%s'\n", name);
 322         return -1;
 323     }
 324
 325     // Process parameter
 326     switch (list->type) {
 327     case OPT_FLAG:
 328     case OPT_NUMBER:
 329     case OPT_SIZE:
 330         list->value.n = value;
 331         break;
 332
 333     default:
 334         return -1;
 335     }
 336
 337     return 0;
 338 }
 339
 340 /*
 341  * Frees a option list. If it contains strings, the strings are freed as well.
 342  */
 343 void free_option_parameters(QEMUOptionParameter *list)
 344 {
 345     QEMUOptionParameter *cur = list;
 346
 347     while (cur && cur->name) {
 348         if (cur->type == OPT_STRING) {
 349             g_free(cur->value.s);
 350         }
 351         cur++;
 352     }
 353
 354     g_free(list);
 355 }
 356
 357 /*
 358  * Count valid options in list
 359  */
 360 static size_t count_option_parameters(QEMUOptionParameter *list)
 361 {
 362     size_t num_options = 0;
 363
 364     while (list && list->name) {
 365         num_options++;
 366         list++;
 367     }
 368
 369     return num_options;
 370 }
 371
 372 /*
 373  * Append an option list (list) to an option list (dest).
 374  *
 375  * If dest is NULL, a new copy of list is created.
 376  *
 377  * Returns a pointer to the first element of dest (or the newly allocated copy)
 378  */
 379 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
 380     QEMUOptionParameter *list)
 381 {
 382     size_t num_options, num_dest_options;
 383
 384     num_options = count_option_parameters(dest);
 385     num_dest_options = num_options;
 386
 387     num_options += count_option_parameters(list);
 388
 389     dest = g_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
 390     dest[num_dest_options].name = NULL;
 391
 392     while (list && list->name) {
 393         if (get_option_parameter(dest, list->name) == NULL) {
 394             dest[num_dest_options++] = *list;
 395             dest[num_dest_options].name = NULL;
 396         }
 397         list++;
 398     }
 399
 400     return dest;
 401 }
 402
 403 /*
 404  * Parses a parameter string (param) into an option list (dest).
 405  *
 406  * list is the template option list. If dest is NULL, a new copy of list is
 407  * created. If list is NULL, this function fails.
 408  *
 409  * A parameter string consists of one or more parameters, separated by commas.
 410  * Each parameter consists of its name and possibly of a value. In the latter
 411  * case, the value is delimited by an = character. To specify a value which
 412  * contains commas, double each comma so it won't be recognized as the end of
 413  * the parameter.
 414  *
 415  * For more details of the parsing see above.
 416  *
 417  * Returns a pointer to the first element of dest (or the newly allocated copy)
 418  * or NULL in error cases
 419  */
 420 QEMUOptionParameter *parse_option_parameters(const char *param,
 421     QEMUOptionParameter *list, QEMUOptionParameter *dest)
 422 {
 423     QEMUOptionParameter *allocated = NULL;
 424     char name[256];
 425     char value[256];
 426     char *param_delim, *value_delim;
 427     char next_delim;
 428
 429     if (list == NULL) {
 430         return NULL;
 431     }
 432
 433     if (dest == NULL) {
 434         dest = allocated = append_option_parameters(NULL, list);
 435     }
 436
 437     while (*param) {
 438
 439         // Find parameter name and value in the string
 440         param_delim = strchr(param, ',');
 441         value_delim = strchr(param, '=');
 442
 443         if (value_delim && (value_delim < param_delim || !param_delim)) {
 444             next_delim = '=';
 445         } else {
 446             next_delim = ',';
 447             value_delim = NULL;
 448         }
 449
 450         param = get_opt_name(name, sizeof(name), param, next_delim);
 451         if (value_delim) {
 452             param = get_opt_value(value, sizeof(value), param + 1);
 453         }
 454         if (*param != '\0') {
 455             param++;
 456         }
 457
 458         // Set the parameter
 459         if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
 460             goto fail;
 461         }
 462     }
 463
 464     return dest;
 465
 466 fail:
 467     // Only free the list if it was newly allocated
 468     free_option_parameters(allocated);
 469     return NULL;
 470 }
 471
 472 /*
 473  * Prints all options of a list that have a value to stdout
 474  */
 475 void print_option_parameters(QEMUOptionParameter *list)
 476 {
 477     while (list && list->name) {
 478         switch (list->type) {
 479             case OPT_STRING:
 480                  if (list->value.s != NULL) {
 481                      printf("%s='%s' ", list->name, list->value.s);
 482                  }
 483                 break;
 484             case OPT_FLAG:
 485                 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
 486                 break;
 487             case OPT_SIZE:
 488             case OPT_NUMBER:
 489                 printf("%s=%" PRId64 " ", list->name, list->value.n);
 490                 break;
 491             default:
 492                 printf("%s=(unknown type) ", list->name);
 493                 break;
 494         }
 495         list++;
 496     }
 497 }
 498
 499 /*
 500  * Prints an overview of all available options
 501  */
 502 void print_option_help(QEMUOptionParameter *list)
 503 {
 504     printf("Supported options:\n");
 505     while (list && list->name) {
 506         printf("%-16s %s\n", list->name,
 507             list->help ? list->help : "No description available");
 508         list++;
 509     }
 510 }
 511
 512 /* ------------------------------------------------------------------ */
 513
 514 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 515 {
 516     QemuOpt *opt;
 517
 518     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 519         if (strcmp(opt->name, name) != 0)
 520             continue;
 521         return opt;
 522     }
 523     return NULL;
 524 }
 525
 526 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 527 {
 528     QemuOpt *opt = qemu_opt_find(opts, name);
 529     return opt ? opt->str : NULL;
 530 }
 531
 532 bool qemu_opt_has_help_opt(QemuOpts *opts)
 533 {
 534     QemuOpt *opt;
 535
 536     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 537         if (is_help_option(opt->name)) {
 538             return true;
 539         }
 540     }
 541     return false;
 542 }
 543
 544 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 545 {
 546     QemuOpt *opt = qemu_opt_find(opts, name);
 547
 548     if (opt == NULL)
 549         return defval;
 550     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 551     return opt->value.boolean;
 552 }
 553
 554 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 555 {
 556     QemuOpt *opt = qemu_opt_find(opts, name);
 557
 558     if (opt == NULL)
 559         return defval;
 560     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 561     return opt->value.uint;
 562 }
 563
 564 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 565 {
 566     QemuOpt *opt = qemu_opt_find(opts, name);
 567
 568     if (opt == NULL)
 569         return defval;
 570     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 571     return opt->value.uint;
 572 }
 573
 574 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
 575 {
 576     if (opt->desc == NULL)
 577         return;
 578
 579     switch (opt->desc->type) {
 580     case QEMU_OPT_STRING:
 581         /* nothing */
 582         return;
 583     case QEMU_OPT_BOOL:
 584         parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
 585         break;
 586     case QEMU_OPT_NUMBER:
 587         parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
 588         break;
 589     case QEMU_OPT_SIZE:
 590         parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
 591         break;
 592     default:
 593         abort();
 594     }
 595 }
 596
 597 static void qemu_opt_del(QemuOpt *opt)
 598 {
 599     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 600     g_free((/* !const */ char*)opt->name);
 601     g_free((/* !const */ char*)opt->str);
 602     g_free(opt);
 603 }
 604
 605 static bool opts_accepts_any(const QemuOpts *opts)
 606 {
 607     return opts->list->desc[0].name == NULL;
 608 }
 609
 610 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
 611                                             const char *name)
 612 {
 613     int i;
 614
 615     for (i = 0; desc[i].name != NULL; i++) {
 616         if (strcmp(desc[i].name, name) == 0) {
 617             return &desc[i];
 618         }
 619     }
 620
 621     return NULL;
 622 }
 623
 624 static void opt_set(QemuOpts *opts, const char *name, const char *value,
 625                     bool prepend, Error **errp)
 626 {
 627     QemuOpt *opt;
 628     const QemuOptDesc *desc;
 629     Error *local_err = NULL;
 630
 631     desc = find_desc_by_name(opts->list->desc, name);
 632     if (!desc && !opts_accepts_any(opts)) {
 633         error_set(errp, QERR_INVALID_PARAMETER, name);
 634         return;
 635     }
 636
 637     opt = g_malloc0(sizeof(*opt));
 638     opt->name = g_strdup(name);
 639     opt->opts = opts;
 640     if (prepend) {
 641         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 642     } else {
 643         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 644     }
 645     opt->desc = desc;
 646     if (value) {
 647         opt->str = g_strdup(value);
 648     }
 649     qemu_opt_parse(opt, &local_err);
 650     if (error_is_set(&local_err)) {
 651         error_propagate(errp, local_err);
 652         qemu_opt_del(opt);
 653     }
 654 }
 655
 656 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 657 {
 658     Error *local_err = NULL;
 659
 660     opt_set(opts, name, value, false, &local_err);
 661     if (error_is_set(&local_err)) {
 662         qerror_report_err(local_err);
 663         error_free(local_err);
 664         return -1;
 665     }
 666
 667     return 0;
 668 }
 669
 670 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 671                       Error **errp)
 672 {
 673     opt_set(opts, name, value, false, errp);
 674 }
 675
 676 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 677 {
 678     QemuOpt *opt;
 679     const QemuOptDesc *desc = opts->list->desc;
 680
 681     opt = g_malloc0(sizeof(*opt));
 682     opt->desc = find_desc_by_name(desc, name);
 683     if (!opt->desc && !opts_accepts_any(opts)) {
 684         qerror_report(QERR_INVALID_PARAMETER, name);
 685         g_free(opt);
 686         return -1;
 687     }
 688
 689     opt->name = g_strdup(name);
 690     opt->opts = opts;
 691     opt->value.boolean = !!val;
 692     opt->str = g_strdup(val ? "on" : "off");
 693     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 694
 695     return 0;
 696 }
 697
 698 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val)
 699 {
 700     QemuOpt *opt;
 701     const QemuOptDesc *desc = opts->list->desc;
 702
 703     opt = g_malloc0(sizeof(*opt));
 704     opt->desc = find_desc_by_name(desc, name);
 705     if (!opt->desc && !opts_accepts_any(opts)) {
 706         qerror_report(QERR_INVALID_PARAMETER, name);
 707         g_free(opt);
 708         return -1;
 709     }
 710
 711     opt->name = g_strdup(name);
 712     opt->opts = opts;
 713     opt->value.uint = val;
 714     opt->str = g_strdup_printf("%" PRId64, val);
 715     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 716
 717     return 0;
 718 }
 719
 720 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 721                      int abort_on_failure)
 722 {
 723     QemuOpt *opt;
 724     int rc = 0;
 725
 726     QTAILQ_FOREACH(opt, &opts->head, next) {
 727         rc = func(opt->name, opt->str, opaque);
 728         if (abort_on_failure  &&  rc != 0)
 729             break;
 730     }
 731     return rc;
 732 }
 733
 734 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 735 {
 736     QemuOpts *opts;
 737
 738     QTAILQ_FOREACH(opts, &list->head, next) {
 739         if (!opts->id) {
 740             if (!id) {
 741                 return opts;
 742             }
 743             continue;
 744         }
 745         if (strcmp(opts->id, id) != 0) {
 746             continue;
 747         }
 748         return opts;
 749     }
 750     return NULL;
 751 }
 752
 753 static int id_wellformed(const char *id)
 754 {
 755     int i;
 756
 757     if (!qemu_isalpha(id[0])) {
 758         return 0;
 759     }
 760     for (i = 1; id[i]; i++) {
 761         if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
 762             return 0;
 763         }
 764     }
 765     return 1;
 766 }
 767
 768 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 769                            int fail_if_exists, Error **errp)
 770 {
 771     QemuOpts *opts = NULL;
 772
 773     if (id) {
 774         if (!id_wellformed(id)) {
 775             error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
 776             error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
 777             return NULL;
 778         }
 779         opts = qemu_opts_find(list, id);
 780         if (opts != NULL) {
 781             if (fail_if_exists && !list->merge_lists) {
 782                 error_set(errp, QERR_DUPLICATE_ID, id, list->name);
 783                 return NULL;
 784             } else {
 785                 return opts;
 786             }
 787         }
 788     } else if (list->merge_lists) {
 789         opts = qemu_opts_find(list, NULL);
 790         if (opts) {
 791             return opts;
 792         }
 793     }
 794     opts = g_malloc0(sizeof(*opts));
 795     if (id) {
 796         opts->id = g_strdup(id);
 797     }
 798     opts->list = list;
 799     loc_save(&opts->loc);
 800     QTAILQ_INIT(&opts->head);
 801     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 802     return opts;
 803 }
 804
 805 QemuOpts *qemu_opts_create_nofail(QemuOptsList *list)
 806 {
 807     QemuOpts *opts;
 808     Error *errp = NULL;
 809     opts = qemu_opts_create(list, NULL, 0, &errp);
 810     assert_no_error(errp);
 811     return opts;
 812 }
 813
 814 void qemu_opts_reset(QemuOptsList *list)
 815 {
 816     QemuOpts *opts, *next_opts;
 817
 818     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 819         qemu_opts_del(opts);
 820     }
 821 }
 822
 823 void qemu_opts_loc_restore(QemuOpts *opts)
 824 {
 825     loc_restore(&opts->loc);
 826 }
 827
 828 int qemu_opts_set(QemuOptsList *list, const char *id,
 829                   const char *name, const char *value)
 830 {
 831     QemuOpts *opts;
 832     Error *local_err = NULL;
 833
 834     opts = qemu_opts_create(list, id, 1, &local_err);
 835     if (error_is_set(&local_err)) {
 836         qerror_report_err(local_err);
 837         error_free(local_err);
 838         return -1;
 839     }
 840     return qemu_opt_set(opts, name, value);
 841 }
 842
 843 const char *qemu_opts_id(QemuOpts *opts)
 844 {
 845     return opts->id;
 846 }
 847
 848 void qemu_opts_del(QemuOpts *opts)
 849 {
 850     QemuOpt *opt;
 851
 852     for (;;) {
 853         opt = QTAILQ_FIRST(&opts->head);
 854         if (opt == NULL)
 855             break;
 856         qemu_opt_del(opt);
 857     }
 858     QTAILQ_REMOVE(&opts->list->head, opts, next);
 859     g_free(opts->id);
 860     g_free(opts);
 861 }
 862
 863 int qemu_opts_print(QemuOpts *opts, void *dummy)
 864 {
 865     QemuOpt *opt;
 866
 867     fprintf(stderr, "%s: %s:", opts->list->name,
 868             opts->id ? opts->id : "<noid>");
 869     QTAILQ_FOREACH(opt, &opts->head, next) {
 870         fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
 871     }
 872     fprintf(stderr, "\n");
 873     return 0;
 874 }
 875
 876 static int opts_do_parse(QemuOpts *opts, const char *params,
 877                          const char *firstname, bool prepend)
 878 {
 879     char option[128], value[1024];
 880     const char *p,*pe,*pc;
 881     Error *local_err = NULL;
 882
 883     for (p = params; *p != '\0'; p++) {
 884         pe = strchr(p, '=');
 885         pc = strchr(p, ',');
 886         if (!pe || (pc && pc < pe)) {
 887             /* found "foo,more" */
 888             if (p == params && firstname) {
 889                 /* implicitly named first option */
 890                 pstrcpy(option, sizeof(option), firstname);
 891                 p = get_opt_value(value, sizeof(value), p);
 892             } else {
 893                 /* option without value, probably a flag */
 894                 p = get_opt_name(option, sizeof(option), p, ',');
 895                 if (strncmp(option, "no", 2) == 0) {
 896                     memmove(option, option+2, strlen(option+2)+1);
 897                     pstrcpy(value, sizeof(value), "off");
 898                 } else {
 899                     pstrcpy(value, sizeof(value), "on");
 900                 }
 901             }
 902         } else {
 903             /* found "foo=bar,more" */
 904             p = get_opt_name(option, sizeof(option), p, '=');
 905             if (*p != '=') {
 906                 break;
 907             }
 908             p++;
 909             p = get_opt_value(value, sizeof(value), p);
 910         }
 911         if (strcmp(option, "id") != 0) {
 912             /* store and parse */
 913             opt_set(opts, option, value, prepend, &local_err);
 914             if (error_is_set(&local_err)) {
 915                 qerror_report_err(local_err);
 916                 error_free(local_err);
 917                 return -1;
 918             }
 919         }
 920         if (*p != ',') {
 921             break;
 922         }
 923     }
 924     return 0;
 925 }
 926
 927 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 928 {
 929     return opts_do_parse(opts, params, firstname, false);
 930 }
 931
 932 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 933                             int permit_abbrev, bool defaults)
 934 {
 935     const char *firstname;
 936     char value[1024], *id = NULL;
 937     const char *p;
 938     QemuOpts *opts;
 939     Error *local_err = NULL;
 940
 941     assert(!permit_abbrev || list->implied_opt_name);
 942     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 943
 944     if (strncmp(params, "id=", 3) == 0) {
 945         get_opt_value(value, sizeof(value), params+3);
 946         id = value;
 947     } else if ((p = strstr(params, ",id=")) != NULL) {
 948         get_opt_value(value, sizeof(value), p+4);
 949         id = value;
 950     }
 951     if (defaults) {
 952         if (!id && !QTAILQ_EMPTY(&list->head)) {
 953             opts = qemu_opts_find(list, NULL);
 954         } else {
 955             opts = qemu_opts_create(list, id, 0, &local_err);
 956         }
 957     } else {
 958         opts = qemu_opts_create(list, id, 1, &local_err);
 959     }
 960     if (opts == NULL) {
 961         if (error_is_set(&local_err)) {
 962             qerror_report_err(local_err);
 963             error_free(local_err);
 964         }
 965         return NULL;
 966     }
 967
 968     if (opts_do_parse(opts, params, firstname, defaults) != 0) {
 969         qemu_opts_del(opts);
 970         return NULL;
 971     }
 972
 973     return opts;
 974 }
 975
 976 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 977                           int permit_abbrev)
 978 {
 979     return opts_parse(list, params, permit_abbrev, false);
 980 }
 981
 982 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 983                             int permit_abbrev)
 984 {
 985     QemuOpts *opts;
 986
 987     opts = opts_parse(list, params, permit_abbrev, true);
 988     assert(opts);
 989 }
 990
 991 typedef struct OptsFromQDictState {
 992     QemuOpts *opts;
 993     Error **errp;
 994 } OptsFromQDictState;
 995
 996 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 997 {
 998     OptsFromQDictState *state = opaque;
 999     char buf[32];
1000     const char *value;
1001     int n;
1002
1003     if (!strcmp(key, "id") || error_is_set(state->errp)) {
1004         return;
1005     }
1006
1007     switch (qobject_type(obj)) {
1008     case QTYPE_QSTRING:
1009         value = qstring_get_str(qobject_to_qstring(obj));
1010         break;
1011     case QTYPE_QINT:
1012         n = snprintf(buf, sizeof(buf), "%" PRId64,
1013                      qint_get_int(qobject_to_qint(obj)));
1014         assert(n < sizeof(buf));
1015         value = buf;
1016         break;
1017     case QTYPE_QFLOAT:
1018         n = snprintf(buf, sizeof(buf), "%.17g",
1019                      qfloat_get_double(qobject_to_qfloat(obj)));
1020         assert(n < sizeof(buf));
1021         value = buf;
1022         break;
1023     case QTYPE_QBOOL:
1024         pstrcpy(buf, sizeof(buf),
1025                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
1026         value = buf;
1027         break;
1028     default:
1029         return;
1030     }
1031
1032     qemu_opt_set_err(state->opts, key, value, state->errp);
1033 }
1034
1035 /*
1036  * Create QemuOpts from a QDict.
1037  * Use value of key "id" as ID if it exists and is a QString.
1038  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
1039  * other types are silently ignored.
1040  */
1041 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
1042                                Error **errp)
1043 {
1044     OptsFromQDictState state;
1045     Error *local_err = NULL;
1046     QemuOpts *opts;
1047
1048     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
1049                             &local_err);
1050     if (error_is_set(&local_err)) {
1051         error_propagate(errp, local_err);
1052         return NULL;
1053     }
1054
1055     assert(opts != NULL);
1056
1057     state.errp = &local_err;
1058     state.opts = opts;
1059     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
1060     if (error_is_set(&local_err)) {
1061         error_propagate(errp, local_err);
1062         qemu_opts_del(opts);
1063         return NULL;
1064     }
1065
1066     return opts;
1067 }
1068
1069 /*
1070  * Convert from QemuOpts to QDict.
1071  * The QDict values are of type QString.
1072  * TODO We'll want to use types appropriate for opt->desc->type, but
1073  * this is enough for now.
1074  */
1075 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1076 {
1077     QemuOpt *opt;
1078     QObject *val;
1079
1080     if (!qdict) {
1081         qdict = qdict_new();
1082     }
1083     if (opts->id) {
1084         qdict_put(qdict, "id", qstring_from_str(opts->id));
1085     }
1086     QTAILQ_FOREACH(opt, &opts->head, next) {
1087         val = QOBJECT(qstring_from_str(opt->str));
1088         qdict_put_obj(qdict, opt->name, val);
1089     }
1090     return qdict;
1091 }
1092
1093 /* Validate parsed opts against descriptions where no
1094  * descriptions were provided in the QemuOptsList.
1095  */
1096 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1097 {
1098     QemuOpt *opt;
1099     Error *local_err = NULL;
1100
1101     assert(opts_accepts_any(opts));
1102
1103     QTAILQ_FOREACH(opt, &opts->head, next) {
1104         opt->desc = find_desc_by_name(desc, opt->name);
1105         if (!opt->desc) {
1106             error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1107             return;
1108         }
1109
1110         qemu_opt_parse(opt, &local_err);
1111         if (error_is_set(&local_err)) {
1112             error_propagate(errp, local_err);
1113             return;
1114         }
1115     }
1116 }
1117
1118 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1119                       int abort_on_failure)
1120 {
1121     Location loc;
1122     QemuOpts *opts;
1123     int rc = 0;
1124
1125     loc_push_none(&loc);
1126     QTAILQ_FOREACH(opts, &list->head, next) {
1127         loc_restore(&opts->loc);
1128         rc |= func(opts, opaque);
1129         if (abort_on_failure  &&  rc != 0)
1130             break;
1131     }
1132     loc_pop(&loc);
1133     return rc;
1134 }