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 static void parse_option_bool(const char *name, const char *value, bool *ret,
 127                               Error **errp)
 128 {
 129     if (value != NULL) {
 130         if (!strcmp(value, "on")) {
 131             *ret = 1;
 132         } else if (!strcmp(value, "off")) {
 133             *ret = 0;
 134         } else {
 135             error_set(errp,QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
 136         }
 137     } else {
 138         *ret = 1;
 139     }
 140 }
 141
 142 static void parse_option_number(const char *name, const char *value,
 143                                 uint64_t *ret, Error **errp)
 144 {
 145     char *postfix;
 146     uint64_t number;
 147
 148     if (value != NULL) {
 149         number = strtoull(value, &postfix, 0);
 150         if (*postfix != '\0') {
 151             error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 152             return;
 153         }
 154         *ret = number;
 155     } else {
 156         error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 157     }
 158 }
 159
 160 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
 161                                             const char *name)
 162 {
 163     int i;
 164
 165     for (i = 0; desc[i].name != NULL; i++) {
 166         if (strcmp(desc[i].name, name) == 0) {
 167             return &desc[i];
 168         }
 169     }
 170
 171     return NULL;
 172 }
 173
 174 void parse_option_size(const char *name, const char *value,
 175                        uint64_t *ret, Error **errp)
 176 {
 177     char *postfix;
 178     double sizef;
 179
 180     if (value != NULL) {
 181         sizef = strtod(value, &postfix);
 182         switch (*postfix) {
 183         case 'T':
 184             sizef *= 1024;
 185             /* fall through */
 186         case 'G':
 187             sizef *= 1024;
 188             /* fall through */
 189         case 'M':
 190             sizef *= 1024;
 191             /* fall through */
 192         case 'K':
 193         case 'k':
 194             sizef *= 1024;
 195             /* fall through */
 196         case 'b':
 197         case '\0':
 198             *ret = (uint64_t) sizef;
 199             break;
 200         default:
 201             error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
 202 #if 0 /* conversion from qerror_report() to error_set() broke this: */
 203             error_printf_unless_qmp("You may use k, M, G or T suffixes for "
 204                     "kilobytes, megabytes, gigabytes and terabytes.\n");
 205 #endif
 206             return;
 207         }
 208     } else {
 209         error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
 210     }
 211 }
 212
 213 bool has_help_option(const char *param)
 214 {
 215     size_t buflen = strlen(param) + 1;
 216     char *buf = g_malloc0(buflen);
 217     const char *p = param;
 218     bool result = false;
 219
 220     while (*p) {
 221         p = get_opt_value(buf, buflen, p);
 222         if (*p) {
 223             p++;
 224         }
 225
 226         if (is_help_option(buf)) {
 227             result = true;
 228             goto out;
 229         }
 230     }
 231
 232 out:
 233     free(buf);
 234     return result;
 235 }
 236
 237 bool is_valid_option_list(const char *param)
 238 {
 239     size_t buflen = strlen(param) + 1;
 240     char *buf = g_malloc0(buflen);
 241     const char *p = param;
 242     bool result = true;
 243
 244     while (*p) {
 245         p = get_opt_value(buf, buflen, p);
 246         if (*p && !*++p) {
 247             result = false;
 248             goto out;
 249         }
 250
 251         if (!*buf || *buf == ',') {
 252             result = false;
 253             goto out;
 254         }
 255     }
 256
 257 out:
 258     free(buf);
 259     return result;
 260 }
 261
 262 void qemu_opts_print_help(QemuOptsList *list)
 263 {
 264     QemuOptDesc *desc;
 265
 266     assert(list);
 267     desc = list->desc;
 268     printf("Supported options:\n");
 269     while (desc && desc->name) {
 270         printf("%-16s %s\n", desc->name,
 271                desc->help ? desc->help : "No description available");
 272         desc++;
 273     }
 274 }
 275 /* ------------------------------------------------------------------ */
 276
 277 QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 278 {
 279     QemuOpt *opt;
 280
 281     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 282         if (strcmp(opt->name, name) != 0)
 283             continue;
 284         return opt;
 285     }
 286     return NULL;
 287 }
 288
 289 static void qemu_opt_del(QemuOpt *opt)
 290 {
 291     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 292     g_free(opt->name);
 293     g_free(opt->str);
 294     g_free(opt);
 295 }
 296
 297 /* qemu_opt_set allows many settings for the same option.
 298  * This function deletes all settings for an option.
 299  */
 300 static void qemu_opt_del_all(QemuOpts *opts, const char *name)
 301 {
 302     QemuOpt *opt, *next_opt;
 303
 304     QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next_opt) {
 305         if (!strcmp(opt->name, name)) {
 306             qemu_opt_del(opt);
 307         }
 308     }
 309 }
 310
 311 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 312 {
 313     QemuOpt *opt;
 314
 315     if (opts == NULL) {
 316         return NULL;
 317     }
 318
 319     opt = qemu_opt_find(opts, name);
 320     if (!opt) {
 321         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 322         if (desc && desc->def_value_str) {
 323             return desc->def_value_str;
 324         }
 325     }
 326     return opt ? opt->str : NULL;
 327 }
 328
 329 /* Get a known option (or its default) and remove it from the list
 330  * all in one action. Return a malloced string of the option value.
 331  * Result must be freed by caller with g_free().
 332  */
 333 char *qemu_opt_get_del(QemuOpts *opts, const char *name)
 334 {
 335     QemuOpt *opt;
 336     const QemuOptDesc *desc;
 337     char *str = NULL;
 338
 339     if (opts == NULL) {
 340         return NULL;
 341     }
 342
 343     opt = qemu_opt_find(opts, name);
 344     if (!opt) {
 345         desc = find_desc_by_name(opts->list->desc, name);
 346         if (desc && desc->def_value_str) {
 347             str = g_strdup(desc->def_value_str);
 348         }
 349         return str;
 350     }
 351     str = opt->str;
 352     opt->str = NULL;
 353     qemu_opt_del_all(opts, name);
 354     return str;
 355 }
 356
 357 bool qemu_opt_has_help_opt(QemuOpts *opts)
 358 {
 359     QemuOpt *opt;
 360
 361     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 362         if (is_help_option(opt->name)) {
 363             return true;
 364         }
 365     }
 366     return false;
 367 }
 368
 369 static bool qemu_opt_get_bool_helper(QemuOpts *opts, const char *name,
 370                                      bool defval, bool del)
 371 {
 372     QemuOpt *opt;
 373     bool ret = defval;
 374
 375     if (opts == NULL) {
 376         return ret;
 377     }
 378
 379     opt = qemu_opt_find(opts, name);
 380     if (opt == NULL) {
 381         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 382         if (desc && desc->def_value_str) {
 383             parse_option_bool(name, desc->def_value_str, &ret, &error_abort);
 384         }
 385         return ret;
 386     }
 387     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 388     ret = opt->value.boolean;
 389     if (del) {
 390         qemu_opt_del_all(opts, name);
 391     }
 392     return ret;
 393 }
 394
 395 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 396 {
 397     return qemu_opt_get_bool_helper(opts, name, defval, false);
 398 }
 399
 400 bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval)
 401 {
 402     return qemu_opt_get_bool_helper(opts, name, defval, true);
 403 }
 404
 405 static uint64_t qemu_opt_get_number_helper(QemuOpts *opts, const char *name,
 406                                            uint64_t defval, bool del)
 407 {
 408     QemuOpt *opt;
 409     uint64_t ret = defval;
 410
 411     if (opts == NULL) {
 412         return ret;
 413     }
 414
 415     opt = qemu_opt_find(opts, name);
 416     if (opt == NULL) {
 417         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 418         if (desc && desc->def_value_str) {
 419             parse_option_number(name, desc->def_value_str, &ret, &error_abort);
 420         }
 421         return ret;
 422     }
 423     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 424     ret = opt->value.uint;
 425     if (del) {
 426         qemu_opt_del_all(opts, name);
 427     }
 428     return ret;
 429 }
 430
 431 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 432 {
 433     return qemu_opt_get_number_helper(opts, name, defval, false);
 434 }
 435
 436 uint64_t qemu_opt_get_number_del(QemuOpts *opts, const char *name,
 437                                  uint64_t defval)
 438 {
 439     return qemu_opt_get_number_helper(opts, name, defval, true);
 440 }
 441
 442 static uint64_t qemu_opt_get_size_helper(QemuOpts *opts, const char *name,
 443                                          uint64_t defval, bool del)
 444 {
 445     QemuOpt *opt;
 446     uint64_t ret = defval;
 447
 448     if (opts == NULL) {
 449         return ret;
 450     }
 451
 452     opt = qemu_opt_find(opts, name);
 453     if (opt == NULL) {
 454         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 455         if (desc && desc->def_value_str) {
 456             parse_option_size(name, desc->def_value_str, &ret, &error_abort);
 457         }
 458         return ret;
 459     }
 460     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 461     ret = opt->value.uint;
 462     if (del) {
 463         qemu_opt_del_all(opts, name);
 464     }
 465     return ret;
 466 }
 467
 468 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 469 {
 470     return qemu_opt_get_size_helper(opts, name, defval, false);
 471 }
 472
 473 uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name,
 474                                uint64_t defval)
 475 {
 476     return qemu_opt_get_size_helper(opts, name, defval, true);
 477 }
 478
 479 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
 480 {
 481     if (opt->desc == NULL)
 482         return;
 483
 484     switch (opt->desc->type) {
 485     case QEMU_OPT_STRING:
 486         /* nothing */
 487         return;
 488     case QEMU_OPT_BOOL:
 489         parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
 490         break;
 491     case QEMU_OPT_NUMBER:
 492         parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
 493         break;
 494     case QEMU_OPT_SIZE:
 495         parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
 496         break;
 497     default:
 498         abort();
 499     }
 500 }
 501
 502 static bool opts_accepts_any(const QemuOpts *opts)
 503 {
 504     return opts->list->desc[0].name == NULL;
 505 }
 506
 507 int qemu_opt_unset(QemuOpts *opts, const char *name)
 508 {
 509     QemuOpt *opt = qemu_opt_find(opts, name);
 510
 511     assert(opts_accepts_any(opts));
 512
 513     if (opt == NULL) {
 514         return -1;
 515     } else {
 516         qemu_opt_del(opt);
 517         return 0;
 518     }
 519 }
 520
 521 static void opt_set(QemuOpts *opts, const char *name, const char *value,
 522                     bool prepend, Error **errp)
 523 {
 524     QemuOpt *opt;
 525     const QemuOptDesc *desc;
 526     Error *local_err = NULL;
 527
 528     desc = find_desc_by_name(opts->list->desc, name);
 529     if (!desc && !opts_accepts_any(opts)) {
 530         error_set(errp, QERR_INVALID_PARAMETER, name);
 531         return;
 532     }
 533
 534     opt = g_malloc0(sizeof(*opt));
 535     opt->name = g_strdup(name);
 536     opt->opts = opts;
 537     if (prepend) {
 538         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 539     } else {
 540         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 541     }
 542     opt->desc = desc;
 543     opt->str = g_strdup(value);
 544     qemu_opt_parse(opt, &local_err);
 545     if (local_err) {
 546         error_propagate(errp, local_err);
 547         qemu_opt_del(opt);
 548     }
 549 }
 550
 551 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 552 {
 553     Error *local_err = NULL;
 554
 555     opt_set(opts, name, value, false, &local_err);
 556     if (local_err) {
 557         qerror_report_err(local_err);
 558         error_free(local_err);
 559         return -1;
 560     }
 561
 562     return 0;
 563 }
 564
 565 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 566                       Error **errp)
 567 {
 568     opt_set(opts, name, value, false, errp);
 569 }
 570
 571 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 572 {
 573     QemuOpt *opt;
 574     const QemuOptDesc *desc = opts->list->desc;
 575
 576     opt = g_malloc0(sizeof(*opt));
 577     opt->desc = find_desc_by_name(desc, name);
 578     if (!opt->desc && !opts_accepts_any(opts)) {
 579         qerror_report(QERR_INVALID_PARAMETER, name);
 580         g_free(opt);
 581         return -1;
 582     }
 583
 584     opt->name = g_strdup(name);
 585     opt->opts = opts;
 586     opt->value.boolean = !!val;
 587     opt->str = g_strdup(val ? "on" : "off");
 588     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 589
 590     return 0;
 591 }
 592
 593 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val)
 594 {
 595     QemuOpt *opt;
 596     const QemuOptDesc *desc = opts->list->desc;
 597
 598     opt = g_malloc0(sizeof(*opt));
 599     opt->desc = find_desc_by_name(desc, name);
 600     if (!opt->desc && !opts_accepts_any(opts)) {
 601         qerror_report(QERR_INVALID_PARAMETER, name);
 602         g_free(opt);
 603         return -1;
 604     }
 605
 606     opt->name = g_strdup(name);
 607     opt->opts = opts;
 608     opt->value.uint = val;
 609     opt->str = g_strdup_printf("%" PRId64, val);
 610     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 611
 612     return 0;
 613 }
 614
 615 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 616                      int abort_on_failure)
 617 {
 618     QemuOpt *opt;
 619     int rc = 0;
 620
 621     QTAILQ_FOREACH(opt, &opts->head, next) {
 622         rc = func(opt->name, opt->str, opaque);
 623         if (abort_on_failure  &&  rc != 0)
 624             break;
 625     }
 626     return rc;
 627 }
 628
 629 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 630 {
 631     QemuOpts *opts;
 632
 633     QTAILQ_FOREACH(opts, &list->head, next) {
 634         if (!opts->id && !id) {
 635             return opts;
 636         }
 637         if (opts->id && id && !strcmp(opts->id, id)) {
 638             return opts;
 639         }
 640     }
 641     return NULL;
 642 }
 643
 644 static int id_wellformed(const char *id)
 645 {
 646     int i;
 647
 648     if (!qemu_isalpha(id[0])) {
 649         return 0;
 650     }
 651     for (i = 1; id[i]; i++) {
 652         if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
 653             return 0;
 654         }
 655     }
 656     return 1;
 657 }
 658
 659 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 660                            int fail_if_exists, Error **errp)
 661 {
 662     QemuOpts *opts = NULL;
 663
 664     if (id) {
 665         if (!id_wellformed(id)) {
 666             error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
 667 #if 0 /* conversion from qerror_report() to error_set() broke this: */
 668             error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
 669 #endif
 670             return NULL;
 671         }
 672         opts = qemu_opts_find(list, id);
 673         if (opts != NULL) {
 674             if (fail_if_exists && !list->merge_lists) {
 675                 error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
 676                 return NULL;
 677             } else {
 678                 return opts;
 679             }
 680         }
 681     } else if (list->merge_lists) {
 682         opts = qemu_opts_find(list, NULL);
 683         if (opts) {
 684             return opts;
 685         }
 686     }
 687     opts = g_malloc0(sizeof(*opts));
 688     opts->id = g_strdup(id);
 689     opts->list = list;
 690     loc_save(&opts->loc);
 691     QTAILQ_INIT(&opts->head);
 692     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 693     return opts;
 694 }
 695
 696 void qemu_opts_reset(QemuOptsList *list)
 697 {
 698     QemuOpts *opts, *next_opts;
 699
 700     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 701         qemu_opts_del(opts);
 702     }
 703 }
 704
 705 void qemu_opts_loc_restore(QemuOpts *opts)
 706 {
 707     loc_restore(&opts->loc);
 708 }
 709
 710 int qemu_opts_set(QemuOptsList *list, const char *id,
 711                   const char *name, const char *value)
 712 {
 713     QemuOpts *opts;
 714     Error *local_err = NULL;
 715
 716     opts = qemu_opts_create(list, id, 1, &local_err);
 717     if (local_err) {
 718         qerror_report_err(local_err);
 719         error_free(local_err);
 720         return -1;
 721     }
 722     return qemu_opt_set(opts, name, value);
 723 }
 724
 725 const char *qemu_opts_id(QemuOpts *opts)
 726 {
 727     return opts->id;
 728 }
 729
 730 /* The id string will be g_free()d by qemu_opts_del */
 731 void qemu_opts_set_id(QemuOpts *opts, char *id)
 732 {
 733     opts->id = id;
 734 }
 735
 736 void qemu_opts_del(QemuOpts *opts)
 737 {
 738     QemuOpt *opt;
 739
 740     if (opts == NULL) {
 741         return;
 742     }
 743
 744     for (;;) {
 745         opt = QTAILQ_FIRST(&opts->head);
 746         if (opt == NULL)
 747             break;
 748         qemu_opt_del(opt);
 749     }
 750     QTAILQ_REMOVE(&opts->list->head, opts, next);
 751     g_free(opts->id);
 752     g_free(opts);
 753 }
 754
 755 void qemu_opts_print(QemuOpts *opts)
 756 {
 757     QemuOpt *opt;
 758     QemuOptDesc *desc = opts->list->desc;
 759
 760     if (desc[0].name == NULL) {
 761         QTAILQ_FOREACH(opt, &opts->head, next) {
 762             printf("%s=\"%s\" ", opt->name, opt->str);
 763         }
 764         return;
 765     }
 766     for (; desc && desc->name; desc++) {
 767         const char *value;
 768         QemuOpt *opt = qemu_opt_find(opts, desc->name);
 769
 770         value = opt ? opt->str : desc->def_value_str;
 771         if (!value) {
 772             continue;
 773         }
 774         if (desc->type == QEMU_OPT_STRING) {
 775             printf("%s='%s' ", desc->name, value);
 776         } else if ((desc->type == QEMU_OPT_SIZE ||
 777                     desc->type == QEMU_OPT_NUMBER) && opt) {
 778             printf("%s=%" PRId64 " ", desc->name, opt->value.uint);
 779         } else {
 780             printf("%s=%s ", desc->name, value);
 781         }
 782     }
 783 }
 784
 785 static int opts_do_parse(QemuOpts *opts, const char *params,
 786                          const char *firstname, bool prepend)
 787 {
 788     char option[128], value[1024];
 789     const char *p,*pe,*pc;
 790     Error *local_err = NULL;
 791
 792     for (p = params; *p != '\0'; p++) {
 793         pe = strchr(p, '=');
 794         pc = strchr(p, ',');
 795         if (!pe || (pc && pc < pe)) {
 796             /* found "foo,more" */
 797             if (p == params && firstname) {
 798                 /* implicitly named first option */
 799                 pstrcpy(option, sizeof(option), firstname);
 800                 p = get_opt_value(value, sizeof(value), p);
 801             } else {
 802                 /* option without value, probably a flag */
 803                 p = get_opt_name(option, sizeof(option), p, ',');
 804                 if (strncmp(option, "no", 2) == 0) {
 805                     memmove(option, option+2, strlen(option+2)+1);
 806                     pstrcpy(value, sizeof(value), "off");
 807                 } else {
 808                     pstrcpy(value, sizeof(value), "on");
 809                 }
 810             }
 811         } else {
 812             /* found "foo=bar,more" */
 813             p = get_opt_name(option, sizeof(option), p, '=');
 814             if (*p != '=') {
 815                 break;
 816             }
 817             p++;
 818             p = get_opt_value(value, sizeof(value), p);
 819         }
 820         if (strcmp(option, "id") != 0) {
 821             /* store and parse */
 822             opt_set(opts, option, value, prepend, &local_err);
 823             if (local_err) {
 824                 qerror_report_err(local_err);
 825                 error_free(local_err);
 826                 return -1;
 827             }
 828         }
 829         if (*p != ',') {
 830             break;
 831         }
 832     }
 833     return 0;
 834 }
 835
 836 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 837 {
 838     return opts_do_parse(opts, params, firstname, false);
 839 }
 840
 841 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 842                             int permit_abbrev, bool defaults)
 843 {
 844     const char *firstname;
 845     char value[1024], *id = NULL;
 846     const char *p;
 847     QemuOpts *opts;
 848     Error *local_err = NULL;
 849
 850     assert(!permit_abbrev || list->implied_opt_name);
 851     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 852
 853     if (strncmp(params, "id=", 3) == 0) {
 854         get_opt_value(value, sizeof(value), params+3);
 855         id = value;
 856     } else if ((p = strstr(params, ",id=")) != NULL) {
 857         get_opt_value(value, sizeof(value), p+4);
 858         id = value;
 859     }
 860
 861     /*
 862      * This code doesn't work for defaults && !list->merge_lists: when
 863      * params has no id=, and list has an element with !opts->id, it
 864      * appends a new element instead of returning the existing opts.
 865      * However, we got no use for this case.  Guard against possible
 866      * (if unlikely) future misuse:
 867      */
 868     assert(!defaults || list->merge_lists);
 869     opts = qemu_opts_create(list, id, !defaults, &local_err);
 870     if (opts == NULL) {
 871         if (local_err) {
 872             qerror_report_err(local_err);
 873             error_free(local_err);
 874         }
 875         return NULL;
 876     }
 877
 878     if (opts_do_parse(opts, params, firstname, defaults) != 0) {
 879         qemu_opts_del(opts);
 880         return NULL;
 881     }
 882
 883     return opts;
 884 }
 885
 886 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 887                           int permit_abbrev)
 888 {
 889     return opts_parse(list, params, permit_abbrev, false);
 890 }
 891
 892 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 893                             int permit_abbrev)
 894 {
 895     QemuOpts *opts;
 896
 897     opts = opts_parse(list, params, permit_abbrev, true);
 898     assert(opts);
 899 }
 900
 901 typedef struct OptsFromQDictState {
 902     QemuOpts *opts;
 903     Error **errp;
 904 } OptsFromQDictState;
 905
 906 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 907 {
 908     OptsFromQDictState *state = opaque;
 909     char buf[32];
 910     const char *value;
 911     int n;
 912
 913     if (!strcmp(key, "id") || *state->errp) {
 914         return;
 915     }
 916
 917     switch (qobject_type(obj)) {
 918     case QTYPE_QSTRING:
 919         value = qstring_get_str(qobject_to_qstring(obj));
 920         break;
 921     case QTYPE_QINT:
 922         n = snprintf(buf, sizeof(buf), "%" PRId64,
 923                      qint_get_int(qobject_to_qint(obj)));
 924         assert(n < sizeof(buf));
 925         value = buf;
 926         break;
 927     case QTYPE_QFLOAT:
 928         n = snprintf(buf, sizeof(buf), "%.17g",
 929                      qfloat_get_double(qobject_to_qfloat(obj)));
 930         assert(n < sizeof(buf));
 931         value = buf;
 932         break;
 933     case QTYPE_QBOOL:
 934         pstrcpy(buf, sizeof(buf),
 935                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
 936         value = buf;
 937         break;
 938     default:
 939         return;
 940     }
 941
 942     qemu_opt_set_err(state->opts, key, value, state->errp);
 943 }
 944
 945 /*
 946  * Create QemuOpts from a QDict.
 947  * Use value of key "id" as ID if it exists and is a QString.
 948  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
 949  * other types are silently ignored.
 950  */
 951 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
 952                                Error **errp)
 953 {
 954     OptsFromQDictState state;
 955     Error *local_err = NULL;
 956     QemuOpts *opts;
 957
 958     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
 959                             &local_err);
 960     if (local_err) {
 961         error_propagate(errp, local_err);
 962         return NULL;
 963     }
 964
 965     assert(opts != NULL);
 966
 967     state.errp = &local_err;
 968     state.opts = opts;
 969     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
 970     if (local_err) {
 971         error_propagate(errp, local_err);
 972         qemu_opts_del(opts);
 973         return NULL;
 974     }
 975
 976     return opts;
 977 }
 978
 979 /*
 980  * Adds all QDict entries to the QemuOpts that can be added and removes them
 981  * from the QDict. When this function returns, the QDict contains only those
 982  * entries that couldn't be added to the QemuOpts.
 983  */
 984 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
 985 {
 986     const QDictEntry *entry, *next;
 987
 988     entry = qdict_first(qdict);
 989
 990     while (entry != NULL) {
 991         Error *local_err = NULL;
 992         OptsFromQDictState state = {
 993             .errp = &local_err,
 994             .opts = opts,
 995         };
 996
 997         next = qdict_next(qdict, entry);
 998
 999         if (find_desc_by_name(opts->list->desc, entry->key)) {
1000             qemu_opts_from_qdict_1(entry->key, entry->value, &state);
1001             if (local_err) {
1002                 error_propagate(errp, local_err);
1003                 return;
1004             } else {
1005                 qdict_del(qdict, entry->key);
1006             }
1007         }
1008
1009         entry = next;
1010     }
1011 }
1012
1013 /*
1014  * Convert from QemuOpts to QDict.
1015  * The QDict values are of type QString.
1016  * TODO We'll want to use types appropriate for opt->desc->type, but
1017  * this is enough for now.
1018  */
1019 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1020 {
1021     QemuOpt *opt;
1022     QObject *val;
1023
1024     if (!qdict) {
1025         qdict = qdict_new();
1026     }
1027     if (opts->id) {
1028         qdict_put(qdict, "id", qstring_from_str(opts->id));
1029     }
1030     QTAILQ_FOREACH(opt, &opts->head, next) {
1031         val = QOBJECT(qstring_from_str(opt->str));
1032         qdict_put_obj(qdict, opt->name, val);
1033     }
1034     return qdict;
1035 }
1036
1037 /* Validate parsed opts against descriptions where no
1038  * descriptions were provided in the QemuOptsList.
1039  */
1040 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1041 {
1042     QemuOpt *opt;
1043     Error *local_err = NULL;
1044
1045     assert(opts_accepts_any(opts));
1046
1047     QTAILQ_FOREACH(opt, &opts->head, next) {
1048         opt->desc = find_desc_by_name(desc, opt->name);
1049         if (!opt->desc) {
1050             error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1051             return;
1052         }
1053
1054         qemu_opt_parse(opt, &local_err);
1055         if (local_err) {
1056             error_propagate(errp, local_err);
1057             return;
1058         }
1059     }
1060 }
1061
1062 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1063                       int abort_on_failure)
1064 {
1065     Location loc;
1066     QemuOpts *opts;
1067     int rc = 0;
1068
1069     loc_push_none(&loc);
1070     QTAILQ_FOREACH(opts, &list->head, next) {
1071         loc_restore(&opts->loc);
1072         rc |= func(opts, opaque);
1073         if (abort_on_failure  &&  rc != 0)
1074             break;
1075     }
1076     loc_pop(&loc);
1077     return rc;
1078 }
1079
1080 static size_t count_opts_list(QemuOptsList *list)
1081 {
1082     QemuOptDesc *desc = NULL;
1083     size_t num_opts = 0;
1084
1085     if (!list) {
1086         return 0;
1087     }
1088
1089     desc = list->desc;
1090     while (desc && desc->name) {
1091         num_opts++;
1092         desc++;
1093     }
1094
1095     return num_opts;
1096 }
1097
1098 void qemu_opts_free(QemuOptsList *list)
1099 {
1100     g_free(list);
1101 }
1102
1103 /* Realloc dst option list and append options from an option list (list)
1104  * to it. dst could be NULL or a malloced list.
1105  * The lifetime of dst must be shorter than the input list because the
1106  * QemuOptDesc->name, ->help, and ->def_value_str strings are shared.
1107  */
1108 QemuOptsList *qemu_opts_append(QemuOptsList *dst,
1109                                QemuOptsList *list)
1110 {
1111     size_t num_opts, num_dst_opts;
1112     QemuOptDesc *desc;
1113     bool need_init = false;
1114     bool need_head_update;
1115
1116     if (!list) {
1117         return dst;
1118     }
1119
1120     /* If dst is NULL, after realloc, some area of dst should be initialized
1121      * before adding options to it.
1122      */
1123     if (!dst) {
1124         need_init = true;
1125         need_head_update = true;
1126     } else {
1127         /* Moreover, even if dst is not NULL, the realloc may move it to a
1128          * different address in which case we may get a stale tail pointer
1129          * in dst->head. */
1130         need_head_update = QTAILQ_EMPTY(&dst->head);
1131     }
1132
1133     num_opts = count_opts_list(dst);
1134     num_dst_opts = num_opts;
1135     num_opts += count_opts_list(list);
1136     dst = g_realloc(dst, sizeof(QemuOptsList) +
1137                     (num_opts + 1) * sizeof(QemuOptDesc));
1138     if (need_init) {
1139         dst->name = NULL;
1140         dst->implied_opt_name = NULL;
1141         dst->merge_lists = false;
1142     }
1143     if (need_head_update) {
1144         QTAILQ_INIT(&dst->head);
1145     }
1146     dst->desc[num_dst_opts].name = NULL;
1147
1148     /* append list->desc to dst->desc */
1149     if (list) {
1150         desc = list->desc;
1151         while (desc && desc->name) {
1152             if (find_desc_by_name(dst->desc, desc->name) == NULL) {
1153                 dst->desc[num_dst_opts++] = *desc;
1154                 dst->desc[num_dst_opts].name = NULL;
1155             }
1156             desc++;
1157         }
1158     }
1159
1160     return dst;
1161 }