util/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 /*
 127  * Searches an option list for an option with the given name
 128  */
 129 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
 130     const char *name)
 131 {
 132     while (list && list->name) {
 133         if (!strcmp(list->name, name)) {
 134             return list;
 135         }
 136         list++;
 137     }
 138
 139     return NULL;
 140 }
 141
 142 static void parse_option_bool(const char *name, const char *value, bool *ret,
 143                               Error **errp)
 144 {
 145     if (value != NULL) {
 146         if (!strcmp(value, "on")) {
 147             *ret = 1;
 148         } else if (!strcmp(value, "off")) {
 149             *ret = 0;
 150         } else {
 151             error_set(errp,QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
 152         }
 153     } else {
 154         *ret = 1;
 155     }
 156 }
 157
 158 static void parse_option_number(const char *name, const char *value,
 159                                 uint64_t *ret, Error **errp)
 160 {
 161     char *postfix;
 162     uint64_t number;
 163
 164     if (value != NULL) {
 165         number = strtoull(value, &postfix, 0);
 166         if (*postfix != '\0') {
 167             error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 168             return;
 169         }
 170         *ret = number;
 171     } else {
 172         error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 173     }
 174 }
 175
 176 void parse_option_size(const char *name, const char *value,
 177                        uint64_t *ret, Error **errp)
 178 {
 179     char *postfix;
 180     double sizef;
 181
 182     if (value != NULL) {
 183         sizef = strtod(value, &postfix);
 184         switch (*postfix) {
 185         case 'T':
 186             sizef *= 1024;
 187             /* fall through */
 188         case 'G':
 189             sizef *= 1024;
 190             /* fall through */
 191         case 'M':
 192             sizef *= 1024;
 193             /* fall through */
 194         case 'K':
 195         case 'k':
 196             sizef *= 1024;
 197             /* fall through */
 198         case 'b':
 199         case '\0':
 200             *ret = (uint64_t) sizef;
 201             break;
 202         default:
 203             error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
 204 #if 0 /* conversion from qerror_report() to error_set() broke this: */
 205             error_printf_unless_qmp("You may use k, M, G or T suffixes for "
 206                     "kilobytes, megabytes, gigabytes and terabytes.\n");
 207 #endif
 208             return;
 209         }
 210     } else {
 211         error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
 212     }
 213 }
 214
 215 /*
 216  * Sets the value of a parameter in a given option list. The parsing of the
 217  * value depends on the type of option:
 218  *
 219  * OPT_FLAG (uses value.n):
 220  *      If no value is given, the flag is set to 1.
 221  *      Otherwise the value must be "on" (set to 1) or "off" (set to 0)
 222  *
 223  * OPT_STRING (uses value.s):
 224  *      value is strdup()ed and assigned as option value
 225  *
 226  * OPT_SIZE (uses value.n):
 227  *      The value is converted to an integer. Suffixes for kilobytes etc. are
 228  *      allowed (powers of 1024).
 229  *
 230  * Returns 0 on succes, -1 in error cases
 231  */
 232 int set_option_parameter(QEMUOptionParameter *list, const char *name,
 233     const char *value)
 234 {
 235     bool flag;
 236     Error *local_err = NULL;
 237
 238     // Find a matching parameter
 239     list = get_option_parameter(list, name);
 240     if (list == NULL) {
 241         fprintf(stderr, "Unknown option '%s'\n", name);
 242         return -1;
 243     }
 244
 245     // Process parameter
 246     switch (list->type) {
 247     case OPT_FLAG:
 248         parse_option_bool(name, value, &flag, &local_err);
 249         if (!error_is_set(&local_err)) {
 250             list->value.n = flag;
 251         }
 252         break;
 253
 254     case OPT_STRING:
 255         if (value != NULL) {
 256             list->value.s = g_strdup(value);
 257         } else {
 258             fprintf(stderr, "Option '%s' needs a parameter\n", name);
 259             return -1;
 260         }
 261         break;
 262
 263     case OPT_SIZE:
 264         parse_option_size(name, value, &list->value.n, &local_err);
 265         break;
 266
 267     default:
 268         fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
 269         return -1;
 270     }
 271
 272     if (error_is_set(&local_err)) {
 273         qerror_report_err(local_err);
 274         error_free(local_err);
 275         return -1;
 276     }
 277
 278     list->assigned = true;
 279
 280     return 0;
 281 }
 282
 283 /*
 284  * Sets the given parameter to an integer instead of a string.
 285  * This function cannot be used to set string options.
 286  *
 287  * Returns 0 on success, -1 in error cases
 288  */
 289 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
 290     uint64_t value)
 291 {
 292     // Find a matching parameter
 293     list = get_option_parameter(list, name);
 294     if (list == NULL) {
 295         fprintf(stderr, "Unknown option '%s'\n", name);
 296         return -1;
 297     }
 298
 299     // Process parameter
 300     switch (list->type) {
 301     case OPT_FLAG:
 302     case OPT_NUMBER:
 303     case OPT_SIZE:
 304         list->value.n = value;
 305         break;
 306
 307     default:
 308         return -1;
 309     }
 310
 311     list->assigned = true;
 312
 313     return 0;
 314 }
 315
 316 /*
 317  * Frees a option list. If it contains strings, the strings are freed as well.
 318  */
 319 void free_option_parameters(QEMUOptionParameter *list)
 320 {
 321     QEMUOptionParameter *cur = list;
 322
 323     while (cur && cur->name) {
 324         if (cur->type == OPT_STRING) {
 325             g_free(cur->value.s);
 326         }
 327         cur++;
 328     }
 329
 330     g_free(list);
 331 }
 332
 333 /*
 334  * Count valid options in list
 335  */
 336 static size_t count_option_parameters(QEMUOptionParameter *list)
 337 {
 338     size_t num_options = 0;
 339
 340     while (list && list->name) {
 341         num_options++;
 342         list++;
 343     }
 344
 345     return num_options;
 346 }
 347
 348 /*
 349  * Append an option list (list) to an option list (dest).
 350  *
 351  * If dest is NULL, a new copy of list is created.
 352  *
 353  * Returns a pointer to the first element of dest (or the newly allocated copy)
 354  */
 355 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
 356     QEMUOptionParameter *list)
 357 {
 358     size_t num_options, num_dest_options;
 359
 360     num_options = count_option_parameters(dest);
 361     num_dest_options = num_options;
 362
 363     num_options += count_option_parameters(list);
 364
 365     dest = g_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
 366     dest[num_dest_options].name = NULL;
 367
 368     while (list && list->name) {
 369         if (get_option_parameter(dest, list->name) == NULL) {
 370             dest[num_dest_options++] = *list;
 371             dest[num_dest_options].name = NULL;
 372         }
 373         list++;
 374     }
 375
 376     return dest;
 377 }
 378
 379 /*
 380  * Parses a parameter string (param) into an option list (dest).
 381  *
 382  * list is the template option list. If dest is NULL, a new copy of list is
 383  * created. If list is NULL, this function fails.
 384  *
 385  * A parameter string consists of one or more parameters, separated by commas.
 386  * Each parameter consists of its name and possibly of a value. In the latter
 387  * case, the value is delimited by an = character. To specify a value which
 388  * contains commas, double each comma so it won't be recognized as the end of
 389  * the parameter.
 390  *
 391  * For more details of the parsing see above.
 392  *
 393  * Returns a pointer to the first element of dest (or the newly allocated copy)
 394  * or NULL in error cases
 395  */
 396 QEMUOptionParameter *parse_option_parameters(const char *param,
 397     QEMUOptionParameter *list, QEMUOptionParameter *dest)
 398 {
 399     QEMUOptionParameter *allocated = NULL;
 400     char name[256];
 401     char value[256];
 402     char *param_delim, *value_delim;
 403     char next_delim;
 404     int i;
 405
 406     if (list == NULL) {
 407         return NULL;
 408     }
 409
 410     if (dest == NULL) {
 411         dest = allocated = append_option_parameters(NULL, list);
 412     }
 413
 414     for (i = 0; dest[i].name; i++) {
 415         dest[i].assigned = false;
 416     }
 417
 418     while (*param) {
 419
 420         // Find parameter name and value in the string
 421         param_delim = strchr(param, ',');
 422         value_delim = strchr(param, '=');
 423
 424         if (value_delim && (value_delim < param_delim || !param_delim)) {
 425             next_delim = '=';
 426         } else {
 427             next_delim = ',';
 428             value_delim = NULL;
 429         }
 430
 431         param = get_opt_name(name, sizeof(name), param, next_delim);
 432         if (value_delim) {
 433             param = get_opt_value(value, sizeof(value), param + 1);
 434         }
 435         if (*param != '\0') {
 436             param++;
 437         }
 438
 439         // Set the parameter
 440         if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
 441             goto fail;
 442         }
 443     }
 444
 445     return dest;
 446
 447 fail:
 448     // Only free the list if it was newly allocated
 449     free_option_parameters(allocated);
 450     return NULL;
 451 }
 452
 453 /*
 454  * Prints all options of a list that have a value to stdout
 455  */
 456 void print_option_parameters(QEMUOptionParameter *list)
 457 {
 458     while (list && list->name) {
 459         switch (list->type) {
 460             case OPT_STRING:
 461                  if (list->value.s != NULL) {
 462                      printf("%s='%s' ", list->name, list->value.s);
 463                  }
 464                 break;
 465             case OPT_FLAG:
 466                 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
 467                 break;
 468             case OPT_SIZE:
 469             case OPT_NUMBER:
 470                 printf("%s=%" PRId64 " ", list->name, list->value.n);
 471                 break;
 472             default:
 473                 printf("%s=(unknown type) ", list->name);
 474                 break;
 475         }
 476         list++;
 477     }
 478 }
 479
 480 /*
 481  * Prints an overview of all available options
 482  */
 483 void print_option_help(QEMUOptionParameter *list)
 484 {
 485     printf("Supported options:\n");
 486     while (list && list->name) {
 487         printf("%-16s %s\n", list->name,
 488             list->help ? list->help : "No description available");
 489         list++;
 490     }
 491 }
 492
 493 /* ------------------------------------------------------------------ */
 494
 495 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 496 {
 497     QemuOpt *opt;
 498
 499     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 500         if (strcmp(opt->name, name) != 0)
 501             continue;
 502         return opt;
 503     }
 504     return NULL;
 505 }
 506
 507 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 508 {
 509     QemuOpt *opt = qemu_opt_find(opts, name);
 510     return opt ? opt->str : NULL;
 511 }
 512
 513 bool qemu_opt_has_help_opt(QemuOpts *opts)
 514 {
 515     QemuOpt *opt;
 516
 517     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 518         if (is_help_option(opt->name)) {
 519             return true;
 520         }
 521     }
 522     return false;
 523 }
 524
 525 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 526 {
 527     QemuOpt *opt = qemu_opt_find(opts, name);
 528
 529     if (opt == NULL)
 530         return defval;
 531     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 532     return opt->value.boolean;
 533 }
 534
 535 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 536 {
 537     QemuOpt *opt = qemu_opt_find(opts, name);
 538
 539     if (opt == NULL)
 540         return defval;
 541     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 542     return opt->value.uint;
 543 }
 544
 545 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 546 {
 547     QemuOpt *opt = qemu_opt_find(opts, name);
 548
 549     if (opt == NULL)
 550         return defval;
 551     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 552     return opt->value.uint;
 553 }
 554
 555 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
 556 {
 557     if (opt->desc == NULL)
 558         return;
 559
 560     switch (opt->desc->type) {
 561     case QEMU_OPT_STRING:
 562         /* nothing */
 563         return;
 564     case QEMU_OPT_BOOL:
 565         parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
 566         break;
 567     case QEMU_OPT_NUMBER:
 568         parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
 569         break;
 570     case QEMU_OPT_SIZE:
 571         parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
 572         break;
 573     default:
 574         abort();
 575     }
 576 }
 577
 578 static void qemu_opt_del(QemuOpt *opt)
 579 {
 580     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 581     g_free((/* !const */ char*)opt->name);
 582     g_free((/* !const */ char*)opt->str);
 583     g_free(opt);
 584 }
 585
 586 static bool opts_accepts_any(const QemuOpts *opts)
 587 {
 588     return opts->list->desc[0].name == NULL;
 589 }
 590
 591 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
 592                                             const char *name)
 593 {
 594     int i;
 595
 596     for (i = 0; desc[i].name != NULL; i++) {
 597         if (strcmp(desc[i].name, name) == 0) {
 598             return &desc[i];
 599         }
 600     }
 601
 602     return NULL;
 603 }
 604
 605 int qemu_opt_unset(QemuOpts *opts, const char *name)
 606 {
 607     QemuOpt *opt = qemu_opt_find(opts, name);
 608
 609     assert(opts_accepts_any(opts));
 610
 611     if (opt == NULL) {
 612         return -1;
 613     } else {
 614         qemu_opt_del(opt);
 615         return 0;
 616     }
 617 }
 618
 619 static void opt_set(QemuOpts *opts, const char *name, const char *value,
 620                     bool prepend, Error **errp)
 621 {
 622     QemuOpt *opt;
 623     const QemuOptDesc *desc;
 624     Error *local_err = NULL;
 625
 626     desc = find_desc_by_name(opts->list->desc, name);
 627     if (!desc && !opts_accepts_any(opts)) {
 628         error_set(errp, QERR_INVALID_PARAMETER, name);
 629         return;
 630     }
 631
 632     opt = g_malloc0(sizeof(*opt));
 633     opt->name = g_strdup(name);
 634     opt->opts = opts;
 635     if (prepend) {
 636         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 637     } else {
 638         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 639     }
 640     opt->desc = desc;
 641     opt->str = g_strdup(value);
 642     qemu_opt_parse(opt, &local_err);
 643     if (error_is_set(&local_err)) {
 644         error_propagate(errp, local_err);
 645         qemu_opt_del(opt);
 646     }
 647 }
 648
 649 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 650 {
 651     Error *local_err = NULL;
 652
 653     opt_set(opts, name, value, false, &local_err);
 654     if (error_is_set(&local_err)) {
 655         qerror_report_err(local_err);
 656         error_free(local_err);
 657         return -1;
 658     }
 659
 660     return 0;
 661 }
 662
 663 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 664                       Error **errp)
 665 {
 666     opt_set(opts, name, value, false, errp);
 667 }
 668
 669 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 670 {
 671     QemuOpt *opt;
 672     const QemuOptDesc *desc = opts->list->desc;
 673
 674     opt = g_malloc0(sizeof(*opt));
 675     opt->desc = find_desc_by_name(desc, name);
 676     if (!opt->desc && !opts_accepts_any(opts)) {
 677         qerror_report(QERR_INVALID_PARAMETER, name);
 678         g_free(opt);
 679         return -1;
 680     }
 681
 682     opt->name = g_strdup(name);
 683     opt->opts = opts;
 684     opt->value.boolean = !!val;
 685     opt->str = g_strdup(val ? "on" : "off");
 686     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 687
 688     return 0;
 689 }
 690
 691 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val)
 692 {
 693     QemuOpt *opt;
 694     const QemuOptDesc *desc = opts->list->desc;
 695
 696     opt = g_malloc0(sizeof(*opt));
 697     opt->desc = find_desc_by_name(desc, name);
 698     if (!opt->desc && !opts_accepts_any(opts)) {
 699         qerror_report(QERR_INVALID_PARAMETER, name);
 700         g_free(opt);
 701         return -1;
 702     }
 703
 704     opt->name = g_strdup(name);
 705     opt->opts = opts;
 706     opt->value.uint = val;
 707     opt->str = g_strdup_printf("%" PRId64, val);
 708     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 709
 710     return 0;
 711 }
 712
 713 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 714                      int abort_on_failure)
 715 {
 716     QemuOpt *opt;
 717     int rc = 0;
 718
 719     QTAILQ_FOREACH(opt, &opts->head, next) {
 720         rc = func(opt->name, opt->str, opaque);
 721         if (abort_on_failure  &&  rc != 0)
 722             break;
 723     }
 724     return rc;
 725 }
 726
 727 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 728 {
 729     QemuOpts *opts;
 730
 731     QTAILQ_FOREACH(opts, &list->head, next) {
 732         if (!opts->id && !id) {
 733             return opts;
 734         }
 735         if (opts->id && id && !strcmp(opts->id, id)) {
 736             return opts;
 737         }
 738     }
 739     return NULL;
 740 }
 741
 742 static int id_wellformed(const char *id)
 743 {
 744     int i;
 745
 746     if (!qemu_isalpha(id[0])) {
 747         return 0;
 748     }
 749     for (i = 1; id[i]; i++) {
 750         if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
 751             return 0;
 752         }
 753     }
 754     return 1;
 755 }
 756
 757 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 758                            int fail_if_exists, Error **errp)
 759 {
 760     QemuOpts *opts = NULL;
 761
 762     if (id) {
 763         if (!id_wellformed(id)) {
 764             error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
 765 #if 0 /* conversion from qerror_report() to error_set() broke this: */
 766             error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
 767 #endif
 768             return NULL;
 769         }
 770         opts = qemu_opts_find(list, id);
 771         if (opts != NULL) {
 772             if (fail_if_exists && !list->merge_lists) {
 773                 error_set(errp, QERR_DUPLICATE_ID, id, list->name);
 774                 return NULL;
 775             } else {
 776                 return opts;
 777             }
 778         }
 779     } else if (list->merge_lists) {
 780         opts = qemu_opts_find(list, NULL);
 781         if (opts) {
 782             return opts;
 783         }
 784     }
 785     opts = g_malloc0(sizeof(*opts));
 786     opts->id = g_strdup(id);
 787     opts->list = list;
 788     loc_save(&opts->loc);
 789     QTAILQ_INIT(&opts->head);
 790     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 791     return opts;
 792 }
 793
 794 QemuOpts *qemu_opts_create_nofail(QemuOptsList *list)
 795 {
 796     QemuOpts *opts;
 797     Error *errp = NULL;
 798     opts = qemu_opts_create(list, NULL, 0, &errp);
 799     assert_no_error(errp);
 800     return opts;
 801 }
 802
 803 void qemu_opts_reset(QemuOptsList *list)
 804 {
 805     QemuOpts *opts, *next_opts;
 806
 807     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 808         qemu_opts_del(opts);
 809     }
 810 }
 811
 812 void qemu_opts_loc_restore(QemuOpts *opts)
 813 {
 814     loc_restore(&opts->loc);
 815 }
 816
 817 int qemu_opts_set(QemuOptsList *list, const char *id,
 818                   const char *name, const char *value)
 819 {
 820     QemuOpts *opts;
 821     Error *local_err = NULL;
 822
 823     opts = qemu_opts_create(list, id, 1, &local_err);
 824     if (error_is_set(&local_err)) {
 825         qerror_report_err(local_err);
 826         error_free(local_err);
 827         return -1;
 828     }
 829     return qemu_opt_set(opts, name, value);
 830 }
 831
 832 const char *qemu_opts_id(QemuOpts *opts)
 833 {
 834     return opts->id;
 835 }
 836
 837 void qemu_opts_del(QemuOpts *opts)
 838 {
 839     QemuOpt *opt;
 840
 841     for (;;) {
 842         opt = QTAILQ_FIRST(&opts->head);
 843         if (opt == NULL)
 844             break;
 845         qemu_opt_del(opt);
 846     }
 847     QTAILQ_REMOVE(&opts->list->head, opts, next);
 848     g_free(opts->id);
 849     g_free(opts);
 850 }
 851
 852 int qemu_opts_print(QemuOpts *opts, void *dummy)
 853 {
 854     QemuOpt *opt;
 855
 856     fprintf(stderr, "%s: %s:", opts->list->name,
 857             opts->id ? opts->id : "<noid>");
 858     QTAILQ_FOREACH(opt, &opts->head, next) {
 859         fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
 860     }
 861     fprintf(stderr, "\n");
 862     return 0;
 863 }
 864
 865 static int opts_do_parse(QemuOpts *opts, const char *params,
 866                          const char *firstname, bool prepend)
 867 {
 868     char option[128], value[1024];
 869     const char *p,*pe,*pc;
 870     Error *local_err = NULL;
 871
 872     for (p = params; *p != '\0'; p++) {
 873         pe = strchr(p, '=');
 874         pc = strchr(p, ',');
 875         if (!pe || (pc && pc < pe)) {
 876             /* found "foo,more" */
 877             if (p == params && firstname) {
 878                 /* implicitly named first option */
 879                 pstrcpy(option, sizeof(option), firstname);
 880                 p = get_opt_value(value, sizeof(value), p);
 881             } else {
 882                 /* option without value, probably a flag */
 883                 p = get_opt_name(option, sizeof(option), p, ',');
 884                 if (strncmp(option, "no", 2) == 0) {
 885                     memmove(option, option+2, strlen(option+2)+1);
 886                     pstrcpy(value, sizeof(value), "off");
 887                 } else {
 888                     pstrcpy(value, sizeof(value), "on");
 889                 }
 890             }
 891         } else {
 892             /* found "foo=bar,more" */
 893             p = get_opt_name(option, sizeof(option), p, '=');
 894             if (*p != '=') {
 895                 break;
 896             }
 897             p++;
 898             p = get_opt_value(value, sizeof(value), p);
 899         }
 900         if (strcmp(option, "id") != 0) {
 901             /* store and parse */
 902             opt_set(opts, option, value, prepend, &local_err);
 903             if (error_is_set(&local_err)) {
 904                 qerror_report_err(local_err);
 905                 error_free(local_err);
 906                 return -1;
 907             }
 908         }
 909         if (*p != ',') {
 910             break;
 911         }
 912     }
 913     return 0;
 914 }
 915
 916 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 917 {
 918     return opts_do_parse(opts, params, firstname, false);
 919 }
 920
 921 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 922                             int permit_abbrev, bool defaults)
 923 {
 924     const char *firstname;
 925     char value[1024], *id = NULL;
 926     const char *p;
 927     QemuOpts *opts;
 928     Error *local_err = NULL;
 929
 930     assert(!permit_abbrev || list->implied_opt_name);
 931     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 932
 933     if (strncmp(params, "id=", 3) == 0) {
 934         get_opt_value(value, sizeof(value), params+3);
 935         id = value;
 936     } else if ((p = strstr(params, ",id=")) != NULL) {
 937         get_opt_value(value, sizeof(value), p+4);
 938         id = value;
 939     }
 940
 941     /*
 942      * This code doesn't work for defaults && !list->merge_lists: when
 943      * params has no id=, and list has an element with !opts->id, it
 944      * appends a new element instead of returning the existing opts.
 945      * However, we got no use for this case.  Guard against possible
 946      * (if unlikely) future misuse:
 947      */
 948     assert(!defaults || list->merge_lists);
 949     opts = qemu_opts_create(list, id, !defaults, &local_err);
 950     if (opts == NULL) {
 951         if (error_is_set(&local_err)) {
 952             qerror_report_err(local_err);
 953             error_free(local_err);
 954         }
 955         return NULL;
 956     }
 957
 958     if (opts_do_parse(opts, params, firstname, defaults) != 0) {
 959         qemu_opts_del(opts);
 960         return NULL;
 961     }
 962
 963     return opts;
 964 }
 965
 966 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 967                           int permit_abbrev)
 968 {
 969     return opts_parse(list, params, permit_abbrev, false);
 970 }
 971
 972 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 973                             int permit_abbrev)
 974 {
 975     QemuOpts *opts;
 976
 977     opts = opts_parse(list, params, permit_abbrev, true);
 978     assert(opts);
 979 }
 980
 981 typedef struct OptsFromQDictState {
 982     QemuOpts *opts;
 983     Error **errp;
 984 } OptsFromQDictState;
 985
 986 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 987 {
 988     OptsFromQDictState *state = opaque;
 989     char buf[32];
 990     const char *value;
 991     int n;
 992
 993     if (!strcmp(key, "id") || error_is_set(state->errp)) {
 994         return;
 995     }
 996
 997     switch (qobject_type(obj)) {
 998     case QTYPE_QSTRING:
 999         value = qstring_get_str(qobject_to_qstring(obj));
1000         break;
1001     case QTYPE_QINT:
1002         n = snprintf(buf, sizeof(buf), "%" PRId64,
1003                      qint_get_int(qobject_to_qint(obj)));
1004         assert(n < sizeof(buf));
1005         value = buf;
1006         break;
1007     case QTYPE_QFLOAT:
1008         n = snprintf(buf, sizeof(buf), "%.17g",
1009                      qfloat_get_double(qobject_to_qfloat(obj)));
1010         assert(n < sizeof(buf));
1011         value = buf;
1012         break;
1013     case QTYPE_QBOOL:
1014         pstrcpy(buf, sizeof(buf),
1015                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
1016         value = buf;
1017         break;
1018     default:
1019         return;
1020     }
1021
1022     qemu_opt_set_err(state->opts, key, value, state->errp);
1023 }
1024
1025 /*
1026  * Create QemuOpts from a QDict.
1027  * Use value of key "id" as ID if it exists and is a QString.
1028  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
1029  * other types are silently ignored.
1030  */
1031 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
1032                                Error **errp)
1033 {
1034     OptsFromQDictState state;
1035     Error *local_err = NULL;
1036     QemuOpts *opts;
1037
1038     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
1039                             &local_err);
1040     if (error_is_set(&local_err)) {
1041         error_propagate(errp, local_err);
1042         return NULL;
1043     }
1044
1045     assert(opts != NULL);
1046
1047     state.errp = &local_err;
1048     state.opts = opts;
1049     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
1050     if (error_is_set(&local_err)) {
1051         error_propagate(errp, local_err);
1052         qemu_opts_del(opts);
1053         return NULL;
1054     }
1055
1056     return opts;
1057 }
1058
1059 /*
1060  * Adds all QDict entries to the QemuOpts that can be added and removes them
1061  * from the QDict. When this function returns, the QDict contains only those
1062  * entries that couldn't be added to the QemuOpts.
1063  */
1064 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
1065 {
1066     const QDictEntry *entry, *next;
1067
1068     entry = qdict_first(qdict);
1069
1070     while (entry != NULL) {
1071         Error *local_err = NULL;
1072         OptsFromQDictState state = {
1073             .errp = &local_err,
1074             .opts = opts,
1075         };
1076
1077         next = qdict_next(qdict, entry);
1078
1079         if (find_desc_by_name(opts->list->desc, entry->key)) {
1080             qemu_opts_from_qdict_1(entry->key, entry->value, &state);
1081             if (error_is_set(&local_err)) {
1082                 error_propagate(errp, local_err);
1083                 return;
1084             } else {
1085                 qdict_del(qdict, entry->key);
1086             }
1087         }
1088
1089         entry = next;
1090     }
1091 }
1092
1093 /*
1094  * Convert from QemuOpts to QDict.
1095  * The QDict values are of type QString.
1096  * TODO We'll want to use types appropriate for opt->desc->type, but
1097  * this is enough for now.
1098  */
1099 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1100 {
1101     QemuOpt *opt;
1102     QObject *val;
1103
1104     if (!qdict) {
1105         qdict = qdict_new();
1106     }
1107     if (opts->id) {
1108         qdict_put(qdict, "id", qstring_from_str(opts->id));
1109     }
1110     QTAILQ_FOREACH(opt, &opts->head, next) {
1111         val = QOBJECT(qstring_from_str(opt->str));
1112         qdict_put_obj(qdict, opt->name, val);
1113     }
1114     return qdict;
1115 }
1116
1117 /* Validate parsed opts against descriptions where no
1118  * descriptions were provided in the QemuOptsList.
1119  */
1120 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1121 {
1122     QemuOpt *opt;
1123     Error *local_err = NULL;
1124
1125     assert(opts_accepts_any(opts));
1126
1127     QTAILQ_FOREACH(opt, &opts->head, next) {
1128         opt->desc = find_desc_by_name(desc, opt->name);
1129         if (!opt->desc) {
1130             error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1131             return;
1132         }
1133
1134         qemu_opt_parse(opt, &local_err);
1135         if (error_is_set(&local_err)) {
1136             error_propagate(errp, local_err);
1137             return;
1138         }
1139     }
1140 }
1141
1142 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1143                       int abort_on_failure)
1144 {
1145     Location loc;
1146     QemuOpts *opts;
1147     int rc = 0;
1148
1149     loc_push_none(&loc);
1150     QTAILQ_FOREACH(opts, &list->head, next) {
1151         loc_restore(&opts->loc);
1152         rc |= func(opts, opaque);
1153         if (abort_on_failure  &&  rc != 0)
1154             break;
1155     }
1156     loc_pop(&loc);
1157     return rc;
1158 }