qemu-option.c

   1 /*
   2  * Commandline option parsing functions
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2009 Kevin Wolf <kwolf@redhat.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "qemu-common.h"
  30 #include "qemu-error.h"
  31 #include "qemu-objects.h"
  32 #include "qemu-option.h"
  33 #include "qerror.h"
  34
  35 /*
  36  * Extracts the name of an option from the parameter string (p points at the
  37  * first byte of the option name)
  38  *
  39  * The option name is delimited by delim (usually , or =) or the string end
  40  * and is copied into buf. If the option name is longer than buf_size, it is
  41  * truncated. buf is always zero terminated.
  42  *
  43  * The return value is the position of the delimiter/zero byte after the option
  44  * name in p.
  45  */
  46 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim)
  47 {
  48     char *q;
  49
  50     q = buf;
  51     while (*p != '\0' && *p != delim) {
  52         if (q && (q - buf) < buf_size - 1)
  53             *q++ = *p;
  54         p++;
  55     }
  56     if (q)
  57         *q = '\0';
  58
  59     return p;
  60 }
  61
  62 /*
  63  * Extracts the value of an option from the parameter string p (p points at the
  64  * first byte of the option value)
  65  *
  66  * This function is comparable to get_opt_name with the difference that the
  67  * delimiter is fixed to be comma which starts a new option. To specify an
  68  * option value that contains commas, double each comma.
  69  */
  70 const char *get_opt_value(char *buf, int buf_size, const char *p)
  71 {
  72     char *q;
  73
  74     q = buf;
  75     while (*p != '\0') {
  76         if (*p == ',') {
  77             if (*(p + 1) != ',')
  78                 break;
  79             p++;
  80         }
  81         if (q && (q - buf) < buf_size - 1)
  82             *q++ = *p;
  83         p++;
  84     }
  85     if (q)
  86         *q = '\0';
  87
  88     return p;
  89 }
  90
  91 int get_next_param_value(char *buf, int buf_size,
  92                          const char *tag, const char **pstr)
  93 {
  94     const char *p;
  95     char option[128];
  96
  97     p = *pstr;
  98     for(;;) {
  99         p = get_opt_name(option, sizeof(option), p, '=');
 100         if (*p != '=')
 101             break;
 102         p++;
 103         if (!strcmp(tag, option)) {
 104             *pstr = get_opt_value(buf, buf_size, p);
 105             if (**pstr == ',') {
 106                 (*pstr)++;
 107             }
 108             return strlen(buf);
 109         } else {
 110             p = get_opt_value(NULL, 0, p);
 111         }
 112         if (*p != ',')
 113             break;
 114         p++;
 115     }
 116     return 0;
 117 }
 118
 119 int get_param_value(char *buf, int buf_size,
 120                     const char *tag, const char *str)
 121 {
 122     return get_next_param_value(buf, buf_size, tag, &str);
 123 }
 124
 125 int check_params(char *buf, int buf_size,
 126                  const char * const *params, const char *str)
 127 {
 128     const char *p;
 129     int i;
 130
 131     p = str;
 132     while (*p != '\0') {
 133         p = get_opt_name(buf, buf_size, p, '=');
 134         if (*p != '=') {
 135             return -1;
 136         }
 137         p++;
 138         for (i = 0; params[i] != NULL; i++) {
 139             if (!strcmp(params[i], buf)) {
 140                 break;
 141             }
 142         }
 143         if (params[i] == NULL) {
 144             return -1;
 145         }
 146         p = get_opt_value(NULL, 0, p);
 147         if (*p != ',') {
 148             break;
 149         }
 150         p++;
 151     }
 152     return 0;
 153 }
 154
 155 /*
 156  * Searches an option list for an option with the given name
 157  */
 158 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
 159     const char *name)
 160 {
 161     while (list && list->name) {
 162         if (!strcmp(list->name, name)) {
 163             return list;
 164         }
 165         list++;
 166     }
 167
 168     return NULL;
 169 }
 170
 171 static int parse_option_bool(const char *name, const char *value, int *ret)
 172 {
 173     if (value != NULL) {
 174         if (!strcmp(value, "on")) {
 175             *ret = 1;
 176         } else if (!strcmp(value, "off")) {
 177             *ret = 0;
 178         } else {
 179             qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
 180             return -1;
 181         }
 182     } else {
 183         *ret = 1;
 184     }
 185     return 0;
 186 }
 187
 188 static int parse_option_number(const char *name, const char *value, uint64_t *ret)
 189 {
 190     char *postfix;
 191     uint64_t number;
 192
 193     if (value != NULL) {
 194         number = strtoull(value, &postfix, 0);
 195         if (*postfix != '\0') {
 196             qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a number");
 197             return -1;
 198         }
 199         *ret = number;
 200     } else {
 201         qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a number");
 202         return -1;
 203     }
 204     return 0;
 205 }
 206
 207 static int parse_option_size(const char *name, const char *value, uint64_t *ret)
 208 {
 209     char *postfix;
 210     double sizef;
 211
 212     if (value != NULL) {
 213         sizef = strtod(value, &postfix);
 214         switch (*postfix) {
 215         case 'T':
 216             sizef *= 1024;
 217         case 'G':
 218             sizef *= 1024;
 219         case 'M':
 220             sizef *= 1024;
 221         case 'K':
 222         case 'k':
 223             sizef *= 1024;
 224         case 'b':
 225         case '\0':
 226             *ret = (uint64_t) sizef;
 227             break;
 228         default:
 229             qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
 230             error_printf_unless_qmp("You may use k, M, G or T suffixes for "
 231                     "kilobytes, megabytes, gigabytes and terabytes.\n");
 232             return -1;
 233         }
 234     } else {
 235         qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
 236         return -1;
 237     }
 238     return 0;
 239 }
 240
 241 /*
 242  * Sets the value of a parameter in a given option list. The parsing of the
 243  * value depends on the type of option:
 244  *
 245  * OPT_FLAG (uses value.n):
 246  *      If no value is given, the flag is set to 1.
 247  *      Otherwise the value must be "on" (set to 1) or "off" (set to 0)
 248  *
 249  * OPT_STRING (uses value.s):
 250  *      value is strdup()ed and assigned as option value
 251  *
 252  * OPT_SIZE (uses value.n):
 253  *      The value is converted to an integer. Suffixes for kilobytes etc. are
 254  *      allowed (powers of 1024).
 255  *
 256  * Returns 0 on succes, -1 in error cases
 257  */
 258 int set_option_parameter(QEMUOptionParameter *list, const char *name,
 259     const char *value)
 260 {
 261     int flag;
 262
 263     // Find a matching parameter
 264     list = get_option_parameter(list, name);
 265     if (list == NULL) {
 266         fprintf(stderr, "Unknown option '%s'\n", name);
 267         return -1;
 268     }
 269
 270     // Process parameter
 271     switch (list->type) {
 272     case OPT_FLAG:
 273         if (parse_option_bool(name, value, &flag) == -1)
 274             return -1;
 275         list->value.n = flag;
 276         break;
 277
 278     case OPT_STRING:
 279         if (value != NULL) {
 280             list->value.s = qemu_strdup(value);
 281         } else {
 282             fprintf(stderr, "Option '%s' needs a parameter\n", name);
 283             return -1;
 284         }
 285         break;
 286
 287     case OPT_SIZE:
 288         if (parse_option_size(name, value, &list->value.n) == -1)
 289             return -1;
 290         break;
 291
 292     default:
 293         fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
 294         return -1;
 295     }
 296
 297     return 0;
 298 }
 299
 300 /*
 301  * Sets the given parameter to an integer instead of a string.
 302  * This function cannot be used to set string options.
 303  *
 304  * Returns 0 on success, -1 in error cases
 305  */
 306 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
 307     uint64_t value)
 308 {
 309     // Find a matching parameter
 310     list = get_option_parameter(list, name);
 311     if (list == NULL) {
 312         fprintf(stderr, "Unknown option '%s'\n", name);
 313         return -1;
 314     }
 315
 316     // Process parameter
 317     switch (list->type) {
 318     case OPT_FLAG:
 319     case OPT_NUMBER:
 320     case OPT_SIZE:
 321         list->value.n = value;
 322         break;
 323
 324     default:
 325         return -1;
 326     }
 327
 328     return 0;
 329 }
 330
 331 /*
 332  * Frees a option list. If it contains strings, the strings are freed as well.
 333  */
 334 void free_option_parameters(QEMUOptionParameter *list)
 335 {
 336     QEMUOptionParameter *cur = list;
 337
 338     while (cur && cur->name) {
 339         if (cur->type == OPT_STRING) {
 340             qemu_free(cur->value.s);
 341         }
 342         cur++;
 343     }
 344
 345     qemu_free(list);
 346 }
 347
 348 /*
 349  * Count valid options in list
 350  */
 351 static size_t count_option_parameters(QEMUOptionParameter *list)
 352 {
 353     size_t num_options = 0;
 354
 355     while (list && list->name) {
 356         num_options++;
 357         list++;
 358     }
 359
 360     return num_options;
 361 }
 362
 363 /*
 364  * Append an option list (list) to an option list (dest).
 365  *
 366  * If dest is NULL, a new copy of list is created.
 367  *
 368  * Returns a pointer to the first element of dest (or the newly allocated copy)
 369  */
 370 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
 371     QEMUOptionParameter *list)
 372 {
 373     size_t num_options, num_dest_options;
 374
 375     num_options = count_option_parameters(dest);
 376     num_dest_options = num_options;
 377
 378     num_options += count_option_parameters(list);
 379
 380     dest = qemu_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
 381
 382     while (list && list->name) {
 383         if (get_option_parameter(dest, list->name) == NULL) {
 384             dest[num_dest_options++] = *list;
 385             dest[num_dest_options].name = NULL;
 386         }
 387         list++;
 388     }
 389
 390     return dest;
 391 }
 392
 393 /*
 394  * Parses a parameter string (param) into an option list (dest).
 395  *
 396  * list is the templace is. If dest is NULL, a new copy of list is created for
 397  * it. If list is NULL, this function fails.
 398  *
 399  * A parameter string consists of one or more parameters, separated by commas.
 400  * Each parameter consists of its name and possibly of a value. In the latter
 401  * case, the value is delimited by an = character. To specify a value which
 402  * contains commas, double each comma so it won't be recognized as the end of
 403  * the parameter.
 404  *
 405  * For more details of the parsing see above.
 406  *
 407  * Returns a pointer to the first element of dest (or the newly allocated copy)
 408  * or NULL in error cases
 409  */
 410 QEMUOptionParameter *parse_option_parameters(const char *param,
 411     QEMUOptionParameter *list, QEMUOptionParameter *dest)
 412 {
 413     QEMUOptionParameter *allocated = NULL;
 414     char name[256];
 415     char value[256];
 416     char *param_delim, *value_delim;
 417     char next_delim;
 418     size_t num_options;
 419
 420     if (list == NULL) {
 421         return NULL;
 422     }
 423
 424     if (dest == NULL) {
 425         // Count valid options
 426         num_options = count_option_parameters(list);
 427
 428         // Create a copy of the option list to fill in values
 429         dest = qemu_mallocz((num_options + 1) * sizeof(QEMUOptionParameter));
 430         allocated = dest;
 431         memcpy(dest, list, (num_options + 1) * sizeof(QEMUOptionParameter));
 432     }
 433
 434     while (*param) {
 435
 436         // Find parameter name and value in the string
 437         param_delim = strchr(param, ',');
 438         value_delim = strchr(param, '=');
 439
 440         if (value_delim && (value_delim < param_delim || !param_delim)) {
 441             next_delim = '=';
 442         } else {
 443             next_delim = ',';
 444             value_delim = NULL;
 445         }
 446
 447         param = get_opt_name(name, sizeof(name), param, next_delim);
 448         if (value_delim) {
 449             param = get_opt_value(value, sizeof(value), param + 1);
 450         }
 451         if (*param != '\0') {
 452             param++;
 453         }
 454
 455         // Set the parameter
 456         if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
 457             goto fail;
 458         }
 459     }
 460
 461     return dest;
 462
 463 fail:
 464     // Only free the list if it was newly allocated
 465     free_option_parameters(allocated);
 466     return NULL;
 467 }
 468
 469 /*
 470  * Prints all options of a list that have a value to stdout
 471  */
 472 void print_option_parameters(QEMUOptionParameter *list)
 473 {
 474     while (list && list->name) {
 475         switch (list->type) {
 476             case OPT_STRING:
 477                  if (list->value.s != NULL) {
 478                      printf("%s='%s' ", list->name, list->value.s);
 479                  }
 480                 break;
 481             case OPT_FLAG:
 482                 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
 483                 break;
 484             case OPT_SIZE:
 485             case OPT_NUMBER:
 486                 printf("%s=%" PRId64 " ", list->name, list->value.n);
 487                 break;
 488             default:
 489                 printf("%s=(unkown type) ", list->name);
 490                 break;
 491         }
 492         list++;
 493     }
 494 }
 495
 496 /*
 497  * Prints an overview of all available options
 498  */
 499 void print_option_help(QEMUOptionParameter *list)
 500 {
 501     printf("Supported options:\n");
 502     while (list && list->name) {
 503         printf("%-16s %s\n", list->name,
 504             list->help ? list->help : "No description available");
 505         list++;
 506     }
 507 }
 508
 509 /* ------------------------------------------------------------------ */
 510
 511 struct QemuOpt {
 512     const char   *name;
 513     const char   *str;
 514
 515     const QemuOptDesc *desc;
 516     union {
 517         int      boolean;
 518         uint64_t uint;
 519     } value;
 520
 521     QemuOpts     *opts;
 522     QTAILQ_ENTRY(QemuOpt) next;
 523 };
 524
 525 struct QemuOpts {
 526     char *id;
 527     QemuOptsList *list;
 528     Location loc;
 529     QTAILQ_HEAD(QemuOptHead, QemuOpt) head;
 530     QTAILQ_ENTRY(QemuOpts) next;
 531 };
 532
 533 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 534 {
 535     QemuOpt *opt;
 536
 537     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 538         if (strcmp(opt->name, name) != 0)
 539             continue;
 540         return opt;
 541     }
 542     return NULL;
 543 }
 544
 545 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 546 {
 547     QemuOpt *opt = qemu_opt_find(opts, name);
 548     return opt ? opt->str : NULL;
 549 }
 550
 551 int qemu_opt_get_bool(QemuOpts *opts, const char *name, int defval)
 552 {
 553     QemuOpt *opt = qemu_opt_find(opts, name);
 554
 555     if (opt == NULL)
 556         return defval;
 557     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 558     return opt->value.boolean;
 559 }
 560
 561 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 562 {
 563     QemuOpt *opt = qemu_opt_find(opts, name);
 564
 565     if (opt == NULL)
 566         return defval;
 567     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 568     return opt->value.uint;
 569 }
 570
 571 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 572 {
 573     QemuOpt *opt = qemu_opt_find(opts, name);
 574
 575     if (opt == NULL)
 576         return defval;
 577     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 578     return opt->value.uint;
 579 }
 580
 581 static int qemu_opt_parse(QemuOpt *opt)
 582 {
 583     if (opt->desc == NULL)
 584         return 0;
 585     switch (opt->desc->type) {
 586     case QEMU_OPT_STRING:
 587         /* nothing */
 588         return 0;
 589     case QEMU_OPT_BOOL:
 590         return parse_option_bool(opt->name, opt->str, &opt->value.boolean);
 591     case QEMU_OPT_NUMBER:
 592         return parse_option_number(opt->name, opt->str, &opt->value.uint);
 593     case QEMU_OPT_SIZE:
 594         return parse_option_size(opt->name, opt->str, &opt->value.uint);
 595     default:
 596         abort();
 597     }
 598 }
 599
 600 static void qemu_opt_del(QemuOpt *opt)
 601 {
 602     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 603     qemu_free((/* !const */ char*)opt->name);
 604     qemu_free((/* !const */ char*)opt->str);
 605     qemu_free(opt);
 606 }
 607
 608 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 609 {
 610     QemuOpt *opt;
 611     const QemuOptDesc *desc = opts->list->desc;
 612     int i;
 613
 614     for (i = 0; desc[i].name != NULL; i++) {
 615         if (strcmp(desc[i].name, name) == 0) {
 616             break;
 617         }
 618     }
 619     if (desc[i].name == NULL) {
 620         if (i == 0) {
 621             /* empty list -> allow any */;
 622         } else {
 623             qerror_report(QERR_INVALID_PARAMETER, name);
 624             return -1;
 625         }
 626     }
 627
 628     opt = qemu_mallocz(sizeof(*opt));
 629     opt->name = qemu_strdup(name);
 630     opt->opts = opts;
 631     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 632     if (desc[i].name != NULL) {
 633         opt->desc = desc+i;
 634     }
 635     if (value) {
 636         opt->str = qemu_strdup(value);
 637     }
 638     if (qemu_opt_parse(opt) < 0) {
 639         qemu_opt_del(opt);
 640         return -1;
 641     }
 642     return 0;
 643 }
 644
 645 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 646                      int abort_on_failure)
 647 {
 648     QemuOpt *opt;
 649     int rc = 0;
 650
 651     QTAILQ_FOREACH(opt, &opts->head, next) {
 652         rc = func(opt->name, opt->str, opaque);
 653         if (abort_on_failure  &&  rc != 0)
 654             break;
 655     }
 656     return rc;
 657 }
 658
 659 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 660 {
 661     QemuOpts *opts;
 662
 663     QTAILQ_FOREACH(opts, &list->head, next) {
 664         if (!opts->id) {
 665             continue;
 666         }
 667         if (strcmp(opts->id, id) != 0) {
 668             continue;
 669         }
 670         return opts;
 671     }
 672     return NULL;
 673 }
 674
 675 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id, int fail_if_exists)
 676 {
 677     QemuOpts *opts = NULL;
 678
 679     if (id) {
 680         opts = qemu_opts_find(list, id);
 681         if (opts != NULL) {
 682             if (fail_if_exists) {
 683                 qerror_report(QERR_DUPLICATE_ID, id, list->name);
 684                 return NULL;
 685             } else {
 686                 return opts;
 687             }
 688         }
 689     }
 690     opts = qemu_mallocz(sizeof(*opts));
 691     if (id) {
 692         opts->id = qemu_strdup(id);
 693     }
 694     opts->list = list;
 695     loc_save(&opts->loc);
 696     QTAILQ_INIT(&opts->head);
 697     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 698     return opts;
 699 }
 700
 701 int qemu_opts_set(QemuOptsList *list, const char *id,
 702                   const char *name, const char *value)
 703 {
 704     QemuOpts *opts;
 705
 706     opts = qemu_opts_create(list, id, 1);
 707     if (opts == NULL) {
 708         return -1;
 709     }
 710     return qemu_opt_set(opts, name, value);
 711 }
 712
 713 const char *qemu_opts_id(QemuOpts *opts)
 714 {
 715     return opts->id;
 716 }
 717
 718 void qemu_opts_del(QemuOpts *opts)
 719 {
 720     QemuOpt *opt;
 721
 722     for (;;) {
 723         opt = QTAILQ_FIRST(&opts->head);
 724         if (opt == NULL)
 725             break;
 726         qemu_opt_del(opt);
 727     }
 728     QTAILQ_REMOVE(&opts->list->head, opts, next);
 729     qemu_free(opts->id);
 730     qemu_free(opts);
 731 }
 732
 733 int qemu_opts_print(QemuOpts *opts, void *dummy)
 734 {
 735     QemuOpt *opt;
 736
 737     fprintf(stderr, "%s: %s:", opts->list->name,
 738             opts->id ? opts->id : "<noid>");
 739     QTAILQ_FOREACH(opt, &opts->head, next) {
 740         fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
 741     }
 742     fprintf(stderr, "\n");
 743     return 0;
 744 }
 745
 746 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 747 {
 748     char option[128], value[1024];
 749     const char *p,*pe,*pc;
 750
 751     for (p = params; *p != '\0'; p++) {
 752         pe = strchr(p, '=');
 753         pc = strchr(p, ',');
 754         if (!pe || (pc && pc < pe)) {
 755             /* found "foo,more" */
 756             if (p == params && firstname) {
 757                 /* implicitly named first option */
 758                 pstrcpy(option, sizeof(option), firstname);
 759                 p = get_opt_value(value, sizeof(value), p);
 760             } else {
 761                 /* option without value, probably a flag */
 762                 p = get_opt_name(option, sizeof(option), p, ',');
 763                 if (strncmp(option, "no", 2) == 0) {
 764                     memmove(option, option+2, strlen(option+2)+1);
 765                     pstrcpy(value, sizeof(value), "off");
 766                 } else {
 767                     pstrcpy(value, sizeof(value), "on");
 768                 }
 769             }
 770         } else {
 771             /* found "foo=bar,more" */
 772             p = get_opt_name(option, sizeof(option), p, '=');
 773             if (*p != '=') {
 774                 break;
 775             }
 776             p++;
 777             p = get_opt_value(value, sizeof(value), p);
 778         }
 779         if (strcmp(option, "id") != 0) {
 780             /* store and parse */
 781             if (qemu_opt_set(opts, option, value) == -1) {
 782                 return -1;
 783             }
 784         }
 785         if (*p != ',') {
 786             break;
 787         }
 788     }
 789     return 0;
 790 }
 791
 792 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 793                           int permit_abbrev)
 794 {
 795     const char *firstname;
 796     char value[1024], *id = NULL;
 797     const char *p;
 798     QemuOpts *opts;
 799
 800     assert(!permit_abbrev || list->implied_opt_name);
 801     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 802
 803     if (strncmp(params, "id=", 3) == 0) {
 804         get_opt_value(value, sizeof(value), params+3);
 805         id = value;
 806     } else if ((p = strstr(params, ",id=")) != NULL) {
 807         get_opt_value(value, sizeof(value), p+4);
 808         id = value;
 809     }
 810     opts = qemu_opts_create(list, id, 1);
 811     if (opts == NULL)
 812         return NULL;
 813
 814     if (qemu_opts_do_parse(opts, params, firstname) != 0) {
 815         qemu_opts_del(opts);
 816         return NULL;
 817     }
 818
 819     return opts;
 820 }
 821
 822 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 823 {
 824     char buf[32];
 825     const char *value;
 826     int n;
 827
 828     if (!strcmp(key, "id")) {
 829         return;
 830     }
 831
 832     switch (qobject_type(obj)) {
 833     case QTYPE_QSTRING:
 834         value = qstring_get_str(qobject_to_qstring(obj));
 835         break;
 836     case QTYPE_QINT:
 837         n = snprintf(buf, sizeof(buf), "%" PRId64,
 838                      qint_get_int(qobject_to_qint(obj)));
 839         assert(n < sizeof(buf));
 840         value = buf;
 841         break;
 842     case QTYPE_QFLOAT:
 843         n = snprintf(buf, sizeof(buf), "%.17g",
 844                      qfloat_get_double(qobject_to_qfloat(obj)));
 845         assert(n < sizeof(buf));
 846         value = buf;
 847         break;
 848     case QTYPE_QBOOL:
 849         pstrcpy(buf, sizeof(buf),
 850                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
 851         value = buf;
 852         break;
 853     default:
 854         return;
 855     }
 856     qemu_opt_set(opaque, key, value);
 857 }
 858
 859 /*
 860  * Create QemuOpts from a QDict.
 861  * Use value of key "id" as ID if it exists and is a QString.
 862  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
 863  * other types are silently ignored.
 864  */
 865 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict)
 866 {
 867     QemuOpts *opts;
 868
 869     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1);
 870     if (opts == NULL)
 871         return NULL;
 872
 873     qdict_iter(qdict, qemu_opts_from_qdict_1, opts);
 874     return opts;
 875 }
 876
 877 /*
 878  * Convert from QemuOpts to QDict.
 879  * The QDict values are of type QString.
 880  * TODO We'll want to use types appropriate for opt->desc->type, but
 881  * this is enough for now.
 882  */
 883 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
 884 {
 885     QemuOpt *opt;
 886     QObject *val;
 887
 888     if (!qdict) {
 889         qdict = qdict_new();
 890     }
 891     if (opts->id) {
 892         qdict_put(qdict, "id", qstring_from_str(opts->id));
 893     }
 894     QTAILQ_FOREACH(opt, &opts->head, next) {
 895         val = QOBJECT(qstring_from_str(opt->str));
 896         qdict_put_obj(qdict, opt->name, val);
 897     }
 898     return qdict;
 899 }
 900
 901 /* Validate parsed opts against descriptions where no
 902  * descriptions were provided in the QemuOptsList.
 903  */
 904 int qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc)
 905 {
 906     QemuOpt *opt;
 907
 908     assert(opts->list->desc[0].name == NULL);
 909
 910     QTAILQ_FOREACH(opt, &opts->head, next) {
 911         int i;
 912
 913         for (i = 0; desc[i].name != NULL; i++) {
 914             if (strcmp(desc[i].name, opt->name) == 0) {
 915                 break;
 916             }
 917         }
 918         if (desc[i].name == NULL) {
 919             qerror_report(QERR_INVALID_PARAMETER, opt->name);
 920             return -1;
 921         }
 922
 923         opt->desc = &desc[i];
 924
 925         if (qemu_opt_parse(opt) < 0) {
 926             return -1;
 927         }
 928     }
 929
 930     return 0;
 931 }
 932
 933 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
 934                       int abort_on_failure)
 935 {
 936     Location loc;
 937     QemuOpts *opts;
 938     int rc = 0;
 939
 940     loc_push_none(&loc);
 941     QTAILQ_FOREACH(opts, &list->head, next) {
 942         loc_restore(&opts->loc);
 943         rc |= func(opts, opaque);
 944         if (abort_on_failure  &&  rc != 0)
 945             break;
 946     }
 947     loc_pop(&loc);
 948     return rc;
 949 }