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 "error.h"
  33 #include "qerror.h"
  34 #include "qemu-option-internal.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 void opt_set(QemuOpts *opts, const char *name, const char *value,
 606                     bool prepend, Error **errp)
 607 {
 608     QemuOpt *opt;
 609     const QemuOptDesc *desc = opts->list->desc;
 610     Error *local_err = NULL;
 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             error_set(errp, QERR_INVALID_PARAMETER, name);
 623             return;
 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     qemu_opt_parse(opt, &local_err);
 642     if (error_is_set(&local_err)) {
 643         error_propagate(errp, local_err);
 644         qemu_opt_del(opt);
 645     }
 646 }
 647
 648 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 649 {
 650     Error *local_err = NULL;
 651
 652     opt_set(opts, name, value, false, &local_err);
 653     if (error_is_set(&local_err)) {
 654         qerror_report_err(local_err);
 655         error_free(local_err);
 656         return -1;
 657     }
 658
 659     return 0;
 660 }
 661
 662 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 663                       Error **errp)
 664 {
 665     opt_set(opts, name, value, false, errp);
 666 }
 667
 668 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 669 {
 670     QemuOpt *opt;
 671     const QemuOptDesc *desc = opts->list->desc;
 672     int i;
 673
 674     for (i = 0; desc[i].name != NULL; i++) {
 675         if (strcmp(desc[i].name, name) == 0) {
 676             break;
 677         }
 678     }
 679     if (desc[i].name == NULL) {
 680         if (i == 0) {
 681             /* empty list -> allow any */;
 682         } else {
 683             qerror_report(QERR_INVALID_PARAMETER, name);
 684             return -1;
 685         }
 686     }
 687
 688     opt = g_malloc0(sizeof(*opt));
 689     opt->name = g_strdup(name);
 690     opt->opts = opts;
 691     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 692     if (desc[i].name != NULL) {
 693         opt->desc = desc+i;
 694     }
 695     opt->value.boolean = !!val;
 696     return 0;
 697 }
 698
 699 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 700                      int abort_on_failure)
 701 {
 702     QemuOpt *opt;
 703     int rc = 0;
 704
 705     QTAILQ_FOREACH(opt, &opts->head, next) {
 706         rc = func(opt->name, opt->str, opaque);
 707         if (abort_on_failure  &&  rc != 0)
 708             break;
 709     }
 710     return rc;
 711 }
 712
 713 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 714 {
 715     QemuOpts *opts;
 716
 717     QTAILQ_FOREACH(opts, &list->head, next) {
 718         if (!opts->id) {
 719             if (!id) {
 720                 return opts;
 721             }
 722             continue;
 723         }
 724         if (strcmp(opts->id, id) != 0) {
 725             continue;
 726         }
 727         return opts;
 728     }
 729     return NULL;
 730 }
 731
 732 static int id_wellformed(const char *id)
 733 {
 734     int i;
 735
 736     if (!qemu_isalpha(id[0])) {
 737         return 0;
 738     }
 739     for (i = 1; id[i]; i++) {
 740         if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
 741             return 0;
 742         }
 743     }
 744     return 1;
 745 }
 746
 747 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 748                            int fail_if_exists, Error **errp)
 749 {
 750     QemuOpts *opts = NULL;
 751
 752     if (id) {
 753         if (!id_wellformed(id)) {
 754             error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
 755             error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
 756             return NULL;
 757         }
 758         opts = qemu_opts_find(list, id);
 759         if (opts != NULL) {
 760             if (fail_if_exists && !list->merge_lists) {
 761                 error_set(errp, QERR_DUPLICATE_ID, id, list->name);
 762                 return NULL;
 763             } else {
 764                 return opts;
 765             }
 766         }
 767     } else if (list->merge_lists) {
 768         opts = qemu_opts_find(list, NULL);
 769         if (opts) {
 770             return opts;
 771         }
 772     }
 773     opts = g_malloc0(sizeof(*opts));
 774     if (id) {
 775         opts->id = g_strdup(id);
 776     }
 777     opts->list = list;
 778     loc_save(&opts->loc);
 779     QTAILQ_INIT(&opts->head);
 780     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 781     return opts;
 782 }
 783
 784 void qemu_opts_reset(QemuOptsList *list)
 785 {
 786     QemuOpts *opts, *next_opts;
 787
 788     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 789         qemu_opts_del(opts);
 790     }
 791 }
 792
 793 void qemu_opts_loc_restore(QemuOpts *opts)
 794 {
 795     loc_restore(&opts->loc);
 796 }
 797
 798 int qemu_opts_set(QemuOptsList *list, const char *id,
 799                   const char *name, const char *value)
 800 {
 801     QemuOpts *opts;
 802     Error *local_err = NULL;
 803
 804     opts = qemu_opts_create(list, id, 1, &local_err);
 805     if (error_is_set(&local_err)) {
 806         qerror_report_err(local_err);
 807         error_free(local_err);
 808         return -1;
 809     }
 810     return qemu_opt_set(opts, name, value);
 811 }
 812
 813 const char *qemu_opts_id(QemuOpts *opts)
 814 {
 815     return opts->id;
 816 }
 817
 818 void qemu_opts_del(QemuOpts *opts)
 819 {
 820     QemuOpt *opt;
 821
 822     for (;;) {
 823         opt = QTAILQ_FIRST(&opts->head);
 824         if (opt == NULL)
 825             break;
 826         qemu_opt_del(opt);
 827     }
 828     QTAILQ_REMOVE(&opts->list->head, opts, next);
 829     g_free(opts->id);
 830     g_free(opts);
 831 }
 832
 833 int qemu_opts_print(QemuOpts *opts, void *dummy)
 834 {
 835     QemuOpt *opt;
 836
 837     fprintf(stderr, "%s: %s:", opts->list->name,
 838             opts->id ? opts->id : "<noid>");
 839     QTAILQ_FOREACH(opt, &opts->head, next) {
 840         fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
 841     }
 842     fprintf(stderr, "\n");
 843     return 0;
 844 }
 845
 846 static int opts_do_parse(QemuOpts *opts, const char *params,
 847                          const char *firstname, bool prepend)
 848 {
 849     char option[128], value[1024];
 850     const char *p,*pe,*pc;
 851     Error *local_err = NULL;
 852
 853     for (p = params; *p != '\0'; p++) {
 854         pe = strchr(p, '=');
 855         pc = strchr(p, ',');
 856         if (!pe || (pc && pc < pe)) {
 857             /* found "foo,more" */
 858             if (p == params && firstname) {
 859                 /* implicitly named first option */
 860                 pstrcpy(option, sizeof(option), firstname);
 861                 p = get_opt_value(value, sizeof(value), p);
 862             } else {
 863                 /* option without value, probably a flag */
 864                 p = get_opt_name(option, sizeof(option), p, ',');
 865                 if (strncmp(option, "no", 2) == 0) {
 866                     memmove(option, option+2, strlen(option+2)+1);
 867                     pstrcpy(value, sizeof(value), "off");
 868                 } else {
 869                     pstrcpy(value, sizeof(value), "on");
 870                 }
 871             }
 872         } else {
 873             /* found "foo=bar,more" */
 874             p = get_opt_name(option, sizeof(option), p, '=');
 875             if (*p != '=') {
 876                 break;
 877             }
 878             p++;
 879             p = get_opt_value(value, sizeof(value), p);
 880         }
 881         if (strcmp(option, "id") != 0) {
 882             /* store and parse */
 883             opt_set(opts, option, value, prepend, &local_err);
 884             if (error_is_set(&local_err)) {
 885                 qerror_report_err(local_err);
 886                 error_free(local_err);
 887                 return -1;
 888             }
 889         }
 890         if (*p != ',') {
 891             break;
 892         }
 893     }
 894     return 0;
 895 }
 896
 897 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 898 {
 899     return opts_do_parse(opts, params, firstname, false);
 900 }
 901
 902 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 903                             int permit_abbrev, bool defaults)
 904 {
 905     const char *firstname;
 906     char value[1024], *id = NULL;
 907     const char *p;
 908     QemuOpts *opts;
 909     Error *local_err = NULL;
 910
 911     assert(!permit_abbrev || list->implied_opt_name);
 912     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 913
 914     if (strncmp(params, "id=", 3) == 0) {
 915         get_opt_value(value, sizeof(value), params+3);
 916         id = value;
 917     } else if ((p = strstr(params, ",id=")) != NULL) {
 918         get_opt_value(value, sizeof(value), p+4);
 919         id = value;
 920     }
 921     if (defaults) {
 922         if (!id && !QTAILQ_EMPTY(&list->head)) {
 923             opts = qemu_opts_find(list, NULL);
 924         } else {
 925             opts = qemu_opts_create(list, id, 0, &local_err);
 926         }
 927     } else {
 928         opts = qemu_opts_create(list, id, 1, &local_err);
 929     }
 930     if (opts == NULL) {
 931         if (error_is_set(&local_err)) {
 932             qerror_report_err(local_err);
 933             error_free(local_err);
 934         }
 935         return NULL;
 936     }
 937
 938     if (opts_do_parse(opts, params, firstname, defaults) != 0) {
 939         qemu_opts_del(opts);
 940         return NULL;
 941     }
 942
 943     return opts;
 944 }
 945
 946 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 947                           int permit_abbrev)
 948 {
 949     return opts_parse(list, params, permit_abbrev, false);
 950 }
 951
 952 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 953                             int permit_abbrev)
 954 {
 955     QemuOpts *opts;
 956
 957     opts = opts_parse(list, params, permit_abbrev, true);
 958     assert(opts);
 959 }
 960
 961 typedef struct OptsFromQDictState {
 962     QemuOpts *opts;
 963     Error **errp;
 964 } OptsFromQDictState;
 965
 966 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 967 {
 968     OptsFromQDictState *state = opaque;
 969     char buf[32];
 970     const char *value;
 971     int n;
 972
 973     if (!strcmp(key, "id") || error_is_set(state->errp)) {
 974         return;
 975     }
 976
 977     switch (qobject_type(obj)) {
 978     case QTYPE_QSTRING:
 979         value = qstring_get_str(qobject_to_qstring(obj));
 980         break;
 981     case QTYPE_QINT:
 982         n = snprintf(buf, sizeof(buf), "%" PRId64,
 983                      qint_get_int(qobject_to_qint(obj)));
 984         assert(n < sizeof(buf));
 985         value = buf;
 986         break;
 987     case QTYPE_QFLOAT:
 988         n = snprintf(buf, sizeof(buf), "%.17g",
 989                      qfloat_get_double(qobject_to_qfloat(obj)));
 990         assert(n < sizeof(buf));
 991         value = buf;
 992         break;
 993     case QTYPE_QBOOL:
 994         pstrcpy(buf, sizeof(buf),
 995                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
 996         value = buf;
 997         break;
 998     default:
 999         return;
1000     }
1001
1002     qemu_opt_set_err(state->opts, key, value, state->errp);
1003 }
1004
1005 /*
1006  * Create QemuOpts from a QDict.
1007  * Use value of key "id" as ID if it exists and is a QString.
1008  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
1009  * other types are silently ignored.
1010  */
1011 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
1012                                Error **errp)
1013 {
1014     OptsFromQDictState state;
1015     Error *local_err = NULL;
1016     QemuOpts *opts;
1017
1018     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
1019                             &local_err);
1020     if (error_is_set(&local_err)) {
1021         error_propagate(errp, local_err);
1022         return NULL;
1023     }
1024
1025     assert(opts != NULL);
1026
1027     state.errp = &local_err;
1028     state.opts = opts;
1029     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
1030     if (error_is_set(&local_err)) {
1031         error_propagate(errp, local_err);
1032         qemu_opts_del(opts);
1033         return NULL;
1034     }
1035
1036     return opts;
1037 }
1038
1039 /*
1040  * Convert from QemuOpts to QDict.
1041  * The QDict values are of type QString.
1042  * TODO We'll want to use types appropriate for opt->desc->type, but
1043  * this is enough for now.
1044  */
1045 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1046 {
1047     QemuOpt *opt;
1048     QObject *val;
1049
1050     if (!qdict) {
1051         qdict = qdict_new();
1052     }
1053     if (opts->id) {
1054         qdict_put(qdict, "id", qstring_from_str(opts->id));
1055     }
1056     QTAILQ_FOREACH(opt, &opts->head, next) {
1057         val = QOBJECT(qstring_from_str(opt->str));
1058         qdict_put_obj(qdict, opt->name, val);
1059     }
1060     return qdict;
1061 }
1062
1063 /* Validate parsed opts against descriptions where no
1064  * descriptions were provided in the QemuOptsList.
1065  */
1066 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1067 {
1068     QemuOpt *opt;
1069     Error *local_err = NULL;
1070
1071     assert(opts->list->desc[0].name == NULL);
1072
1073     QTAILQ_FOREACH(opt, &opts->head, next) {
1074         int i;
1075
1076         for (i = 0; desc[i].name != NULL; i++) {
1077             if (strcmp(desc[i].name, opt->name) == 0) {
1078                 break;
1079             }
1080         }
1081         if (desc[i].name == NULL) {
1082             error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1083             return;
1084         }
1085
1086         opt->desc = &desc[i];
1087
1088         qemu_opt_parse(opt, &local_err);
1089         if (error_is_set(&local_err)) {
1090             error_propagate(errp, local_err);
1091             return;
1092         }
1093     }
1094 }
1095
1096 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1097                       int abort_on_failure)
1098 {
1099     Location loc;
1100     QemuOpts *opts;
1101     int rc = 0;
1102
1103     loc_push_none(&loc);
1104     QTAILQ_FOREACH(opts, &list->head, next) {
1105         loc_restore(&opts->loc);
1106         rc |= func(opts, opaque);
1107         if (abort_on_failure  &&  rc != 0)
1108             break;
1109     }
1110     loc_pop(&loc);
1111     return rc;
1112 }