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 "qemu/osdep.h"
  27
  28 #include "qapi/error.h"
  29 #include "qemu-common.h"
  30 #include "qemu/error-report.h"
  31 #include "qapi/qmp/qbool.h"
  32 #include "qapi/qmp/qdict.h"
  33 #include "qapi/qmp/qnum.h"
  34 #include "qapi/qmp/qstring.h"
  35 #include "qapi/qmp/qerror.h"
  36 #include "qemu/option_int.h"
  37 #include "qemu/cutils.h"
  38 #include "qemu/id.h"
  39 #include "qemu/help_option.h"
  40
  41 /*
  42  * Extracts the name of an option from the parameter string (p points at the
  43  * first byte of the option name)
  44  *
  45  * The option name is delimited by delim (usually , or =) or the string end
  46  * and is copied into option. The caller is responsible for free'ing option
  47  * when no longer required.
  48  *
  49  * The return value is the position of the delimiter/zero byte after the option
  50  * name in p.
  51  */
  52 static const char *get_opt_name(const char *p, char **option, char delim)
  53 {
  54     char *offset = strchr(p, delim);
  55
  56     if (offset) {
  57         *option = g_strndup(p, offset - p);
  58         return offset;
  59     } else {
  60         *option = g_strdup(p);
  61         return p + strlen(p);
  62     }
  63 }
  64
  65 /*
  66  * Extracts the value of an option from the parameter string p (p points at the
  67  * first byte of the option value)
  68  *
  69  * This function is comparable to get_opt_name with the difference that the
  70  * delimiter is fixed to be comma which starts a new option. To specify an
  71  * option value that contains commas, double each comma.
  72  */
  73 const char *get_opt_value(const char *p, char **value)
  74 {
  75     size_t capacity = 0, length;
  76     const char *offset;
  77
  78     *value = NULL;
  79     while (1) {
  80         offset = qemu_strchrnul(p, ',');
  81         length = offset - p;
  82         if (*offset != '\0' && *(offset + 1) == ',') {
  83             length++;
  84         }
  85         *value = g_renew(char, *value, capacity + length + 1);
  86         strncpy(*value + capacity, p, length);
  87         (*value)[capacity + length] = '\0';
  88         capacity += length;
  89         if (*offset == '\0' ||
  90             *(offset + 1) != ',') {
  91             break;
  92         }
  93
  94         p += (offset - p) + 2;
  95     }
  96
  97     return offset;
  98 }
  99
 100 static void parse_option_bool(const char *name, const char *value, bool *ret,
 101                               Error **errp)
 102 {
 103     if (!strcmp(value, "on")) {
 104         *ret = 1;
 105     } else if (!strcmp(value, "off")) {
 106         *ret = 0;
 107     } else {
 108         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 109                    name, "'on' or 'off'");
 110     }
 111 }
 112
 113 static void parse_option_number(const char *name, const char *value,
 114                                 uint64_t *ret, Error **errp)
 115 {
 116     uint64_t number;
 117     int err;
 118
 119     err = qemu_strtou64(value, NULL, 0, &number);
 120     if (err == -ERANGE) {
 121         error_setg(errp, "Value '%s' is too large for parameter '%s'",
 122                    value, name);
 123         return;
 124     }
 125     if (err) {
 126         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 127         return;
 128     }
 129     *ret = number;
 130 }
 131
 132 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
 133                                             const char *name)
 134 {
 135     int i;
 136
 137     for (i = 0; desc[i].name != NULL; i++) {
 138         if (strcmp(desc[i].name, name) == 0) {
 139             return &desc[i];
 140         }
 141     }
 142
 143     return NULL;
 144 }
 145
 146 void parse_option_size(const char *name, const char *value,
 147                        uint64_t *ret, Error **errp)
 148 {
 149     uint64_t size;
 150     int err;
 151
 152     err = qemu_strtosz(value, NULL, &size);
 153     if (err == -ERANGE) {
 154         error_setg(errp, "Value '%s' is out of range for parameter '%s'",
 155                    value, name);
 156         return;
 157     }
 158     if (err) {
 159         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
 160                    "a non-negative number below 2^64");
 161         error_append_hint(errp, "Optional suffix k, M, G, T, P or E means"
 162                           " kilo-, mega-, giga-, tera-, peta-\n"
 163                           "and exabytes, respectively.\n");
 164         return;
 165     }
 166     *ret = size;
 167 }
 168
 169 bool has_help_option(const char *param)
 170 {
 171     const char *p = param;
 172     bool result = false;
 173
 174     while (*p && !result) {
 175         char *value;
 176
 177         p = get_opt_value(p, &value);
 178         if (*p) {
 179             p++;
 180         }
 181
 182         result = is_help_option(value);
 183         g_free(value);
 184     }
 185
 186     return result;
 187 }
 188
 189 bool is_valid_option_list(const char *p)
 190 {
 191     char *value = NULL;
 192     bool result = false;
 193
 194     while (*p) {
 195         p = get_opt_value(p, &value);
 196         if ((*p && !*++p) ||
 197             (!*value || *value == ',')) {
 198             goto out;
 199         }
 200
 201         g_free(value);
 202         value = NULL;
 203     }
 204
 205     result = true;
 206 out:
 207     g_free(value);
 208     return result;
 209 }
 210
 211 static const char *opt_type_to_string(enum QemuOptType type)
 212 {
 213     switch (type) {
 214     case QEMU_OPT_STRING:
 215         return "str";
 216     case QEMU_OPT_BOOL:
 217         return "bool (on/off)";
 218     case QEMU_OPT_NUMBER:
 219         return "num";
 220     case QEMU_OPT_SIZE:
 221         return "size";
 222     }
 223
 224     g_assert_not_reached();
 225 }
 226
 227 /**
 228  * Print the list of options available in the given list.  If
 229  * @print_caption is true, a caption (including the list name, if it
 230  * exists) is printed.  The options itself will be indented, so
 231  * @print_caption should only be set to false if the caller prints its
 232  * own custom caption (so that the indentation makes sense).
 233  */
 234 void qemu_opts_print_help(QemuOptsList *list, bool print_caption)
 235 {
 236     QemuOptDesc *desc;
 237     int i;
 238     GPtrArray *array = g_ptr_array_new();
 239
 240     assert(list);
 241     desc = list->desc;
 242     while (desc && desc->name) {
 243         GString *str = g_string_new(NULL);
 244         g_string_append_printf(str, "  %s=<%s>", desc->name,
 245                                opt_type_to_string(desc->type));
 246         if (desc->help) {
 247             if (str->len < 24) {
 248                 g_string_append_printf(str, "%*s", 24 - (int)str->len, "");
 249             }
 250             g_string_append_printf(str, " - %s", desc->help);
 251         }
 252         g_ptr_array_add(array, g_string_free(str, false));
 253         desc++;
 254     }
 255
 256     g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
 257     if (print_caption && array->len > 0) {
 258         if (list->name) {
 259             printf("%s options:\n", list->name);
 260         } else {
 261             printf("Options:\n");
 262         }
 263     } else if (array->len == 0) {
 264         if (list->name) {
 265             printf("There are no options for %s.\n", list->name);
 266         } else {
 267             printf("No options available.\n");
 268         }
 269     }
 270     for (i = 0; i < array->len; i++) {
 271         printf("%s\n", (char *)array->pdata[i]);
 272     }
 273     g_ptr_array_set_free_func(array, g_free);
 274     g_ptr_array_free(array, true);
 275
 276 }
 277 /* ------------------------------------------------------------------ */
 278
 279 QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 280 {
 281     QemuOpt *opt;
 282
 283     QTAILQ_FOREACH_REVERSE(opt, &opts->head, next) {
 284         if (strcmp(opt->name, name) != 0)
 285             continue;
 286         return opt;
 287     }
 288     return NULL;
 289 }
 290
 291 static void qemu_opt_del(QemuOpt *opt)
 292 {
 293     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 294     g_free(opt->name);
 295     g_free(opt->str);
 296     g_free(opt);
 297 }
 298
 299 /* qemu_opt_set allows many settings for the same option.
 300  * This function deletes all settings for an option.
 301  */
 302 static void qemu_opt_del_all(QemuOpts *opts, const char *name)
 303 {
 304     QemuOpt *opt, *next_opt;
 305
 306     QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next_opt) {
 307         if (!strcmp(opt->name, name)) {
 308             qemu_opt_del(opt);
 309         }
 310     }
 311 }
 312
 313 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 314 {
 315     QemuOpt *opt;
 316
 317     if (opts == NULL) {
 318         return NULL;
 319     }
 320
 321     opt = qemu_opt_find(opts, name);
 322     if (!opt) {
 323         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 324         if (desc && desc->def_value_str) {
 325             return desc->def_value_str;
 326         }
 327     }
 328     return opt ? opt->str : NULL;
 329 }
 330
 331 void qemu_opt_iter_init(QemuOptsIter *iter, QemuOpts *opts, const char *name)
 332 {
 333     iter->opts = opts;
 334     iter->opt = QTAILQ_FIRST(&opts->head);
 335     iter->name = name;
 336 }
 337
 338 const char *qemu_opt_iter_next(QemuOptsIter *iter)
 339 {
 340     QemuOpt *ret = iter->opt;
 341     if (iter->name) {
 342         while (ret && !g_str_equal(iter->name, ret->name)) {
 343             ret = QTAILQ_NEXT(ret, next);
 344         }
 345     }
 346     iter->opt = ret ? QTAILQ_NEXT(ret, next) : NULL;
 347     return ret ? ret->str : NULL;
 348 }
 349
 350 /* Get a known option (or its default) and remove it from the list
 351  * all in one action. Return a malloced string of the option value.
 352  * Result must be freed by caller with g_free().
 353  */
 354 char *qemu_opt_get_del(QemuOpts *opts, const char *name)
 355 {
 356     QemuOpt *opt;
 357     const QemuOptDesc *desc;
 358     char *str = NULL;
 359
 360     if (opts == NULL) {
 361         return NULL;
 362     }
 363
 364     opt = qemu_opt_find(opts, name);
 365     if (!opt) {
 366         desc = find_desc_by_name(opts->list->desc, name);
 367         if (desc && desc->def_value_str) {
 368             str = g_strdup(desc->def_value_str);
 369         }
 370         return str;
 371     }
 372     str = opt->str;
 373     opt->str = NULL;
 374     qemu_opt_del_all(opts, name);
 375     return str;
 376 }
 377
 378 bool qemu_opt_has_help_opt(QemuOpts *opts)
 379 {
 380     QemuOpt *opt;
 381
 382     QTAILQ_FOREACH_REVERSE(opt, &opts->head, next) {
 383         if (is_help_option(opt->name)) {
 384             return true;
 385         }
 386     }
 387     return false;
 388 }
 389
 390 static bool qemu_opt_get_bool_helper(QemuOpts *opts, const char *name,
 391                                      bool defval, bool del)
 392 {
 393     QemuOpt *opt;
 394     bool ret = defval;
 395
 396     if (opts == NULL) {
 397         return ret;
 398     }
 399
 400     opt = qemu_opt_find(opts, name);
 401     if (opt == NULL) {
 402         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 403         if (desc && desc->def_value_str) {
 404             parse_option_bool(name, desc->def_value_str, &ret, &error_abort);
 405         }
 406         return ret;
 407     }
 408     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 409     ret = opt->value.boolean;
 410     if (del) {
 411         qemu_opt_del_all(opts, name);
 412     }
 413     return ret;
 414 }
 415
 416 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 417 {
 418     return qemu_opt_get_bool_helper(opts, name, defval, false);
 419 }
 420
 421 bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval)
 422 {
 423     return qemu_opt_get_bool_helper(opts, name, defval, true);
 424 }
 425
 426 static uint64_t qemu_opt_get_number_helper(QemuOpts *opts, const char *name,
 427                                            uint64_t defval, bool del)
 428 {
 429     QemuOpt *opt;
 430     uint64_t ret = defval;
 431
 432     if (opts == NULL) {
 433         return ret;
 434     }
 435
 436     opt = qemu_opt_find(opts, name);
 437     if (opt == NULL) {
 438         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 439         if (desc && desc->def_value_str) {
 440             parse_option_number(name, desc->def_value_str, &ret, &error_abort);
 441         }
 442         return ret;
 443     }
 444     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 445     ret = opt->value.uint;
 446     if (del) {
 447         qemu_opt_del_all(opts, name);
 448     }
 449     return ret;
 450 }
 451
 452 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 453 {
 454     return qemu_opt_get_number_helper(opts, name, defval, false);
 455 }
 456
 457 uint64_t qemu_opt_get_number_del(QemuOpts *opts, const char *name,
 458                                  uint64_t defval)
 459 {
 460     return qemu_opt_get_number_helper(opts, name, defval, true);
 461 }
 462
 463 static uint64_t qemu_opt_get_size_helper(QemuOpts *opts, const char *name,
 464                                          uint64_t defval, bool del)
 465 {
 466     QemuOpt *opt;
 467     uint64_t ret = defval;
 468
 469     if (opts == NULL) {
 470         return ret;
 471     }
 472
 473     opt = qemu_opt_find(opts, name);
 474     if (opt == NULL) {
 475         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 476         if (desc && desc->def_value_str) {
 477             parse_option_size(name, desc->def_value_str, &ret, &error_abort);
 478         }
 479         return ret;
 480     }
 481     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 482     ret = opt->value.uint;
 483     if (del) {
 484         qemu_opt_del_all(opts, name);
 485     }
 486     return ret;
 487 }
 488
 489 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 490 {
 491     return qemu_opt_get_size_helper(opts, name, defval, false);
 492 }
 493
 494 uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name,
 495                                uint64_t defval)
 496 {
 497     return qemu_opt_get_size_helper(opts, name, defval, true);
 498 }
 499
 500 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
 501 {
 502     if (opt->desc == NULL)
 503         return;
 504
 505     switch (opt->desc->type) {
 506     case QEMU_OPT_STRING:
 507         /* nothing */
 508         return;
 509     case QEMU_OPT_BOOL:
 510         parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
 511         break;
 512     case QEMU_OPT_NUMBER:
 513         parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
 514         break;
 515     case QEMU_OPT_SIZE:
 516         parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
 517         break;
 518     default:
 519         abort();
 520     }
 521 }
 522
 523 static bool opts_accepts_any(const QemuOpts *opts)
 524 {
 525     return opts->list->desc[0].name == NULL;
 526 }
 527
 528 int qemu_opt_unset(QemuOpts *opts, const char *name)
 529 {
 530     QemuOpt *opt = qemu_opt_find(opts, name);
 531
 532     assert(opts_accepts_any(opts));
 533
 534     if (opt == NULL) {
 535         return -1;
 536     } else {
 537         qemu_opt_del(opt);
 538         return 0;
 539     }
 540 }
 541
 542 static void opt_set(QemuOpts *opts, const char *name, char *value,
 543                     bool prepend, bool *invalidp, Error **errp)
 544 {
 545     QemuOpt *opt;
 546     const QemuOptDesc *desc;
 547     Error *local_err = NULL;
 548
 549     desc = find_desc_by_name(opts->list->desc, name);
 550     if (!desc && !opts_accepts_any(opts)) {
 551         g_free(value);
 552         error_setg(errp, QERR_INVALID_PARAMETER, name);
 553         if (invalidp) {
 554             *invalidp = true;
 555         }
 556         return;
 557     }
 558
 559     opt = g_malloc0(sizeof(*opt));
 560     opt->name = g_strdup(name);
 561     opt->opts = opts;
 562     if (prepend) {
 563         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 564     } else {
 565         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 566     }
 567     opt->desc = desc;
 568     opt->str = value;
 569     qemu_opt_parse(opt, &local_err);
 570     if (local_err) {
 571         error_propagate(errp, local_err);
 572         qemu_opt_del(opt);
 573     }
 574 }
 575
 576 void qemu_opt_set(QemuOpts *opts, const char *name, const char *value,
 577                   Error **errp)
 578 {
 579     opt_set(opts, name, g_strdup(value), false, NULL, errp);
 580 }
 581
 582 void qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val,
 583                        Error **errp)
 584 {
 585     QemuOpt *opt;
 586     const QemuOptDesc *desc = opts->list->desc;
 587
 588     opt = g_malloc0(sizeof(*opt));
 589     opt->desc = find_desc_by_name(desc, name);
 590     if (!opt->desc && !opts_accepts_any(opts)) {
 591         error_setg(errp, QERR_INVALID_PARAMETER, name);
 592         g_free(opt);
 593         return;
 594     }
 595
 596     opt->name = g_strdup(name);
 597     opt->opts = opts;
 598     opt->value.boolean = !!val;
 599     opt->str = g_strdup(val ? "on" : "off");
 600     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 601 }
 602
 603 void qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val,
 604                          Error **errp)
 605 {
 606     QemuOpt *opt;
 607     const QemuOptDesc *desc = opts->list->desc;
 608
 609     opt = g_malloc0(sizeof(*opt));
 610     opt->desc = find_desc_by_name(desc, name);
 611     if (!opt->desc && !opts_accepts_any(opts)) {
 612         error_setg(errp, QERR_INVALID_PARAMETER, name);
 613         g_free(opt);
 614         return;
 615     }
 616
 617     opt->name = g_strdup(name);
 618     opt->opts = opts;
 619     opt->value.uint = val;
 620     opt->str = g_strdup_printf("%" PRId64, val);
 621     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 622 }
 623
 624 /**
 625  * For each member of @opts, call @func(@opaque, name, value, @errp).
 626  * @func() may store an Error through @errp, but must return non-zero then.
 627  * When @func() returns non-zero, break the loop and return that value.
 628  * Return zero when the loop completes.
 629  */
 630 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 631                      Error **errp)
 632 {
 633     QemuOpt *opt;
 634     int rc;
 635
 636     QTAILQ_FOREACH(opt, &opts->head, next) {
 637         rc = func(opaque, opt->name, opt->str, errp);
 638         if (rc) {
 639             return rc;
 640         }
 641         assert(!errp || !*errp);
 642     }
 643     return 0;
 644 }
 645
 646 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 647 {
 648     QemuOpts *opts;
 649
 650     QTAILQ_FOREACH(opts, &list->head, next) {
 651         if (!opts->id && !id) {
 652             return opts;
 653         }
 654         if (opts->id && id && !strcmp(opts->id, id)) {
 655             return opts;
 656         }
 657     }
 658     return NULL;
 659 }
 660
 661 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 662                            int fail_if_exists, Error **errp)
 663 {
 664     QemuOpts *opts = NULL;
 665
 666     if (id) {
 667         if (!id_wellformed(id)) {
 668             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id",
 669                        "an identifier");
 670             error_append_hint(errp, "Identifiers consist of letters, digits, "
 671                               "'-', '.', '_', starting with a letter.\n");
 672             return NULL;
 673         }
 674         opts = qemu_opts_find(list, id);
 675         if (opts != NULL) {
 676             if (fail_if_exists && !list->merge_lists) {
 677                 error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
 678                 return NULL;
 679             } else {
 680                 return opts;
 681             }
 682         }
 683     } else if (list->merge_lists) {
 684         opts = qemu_opts_find(list, NULL);
 685         if (opts) {
 686             return opts;
 687         }
 688     }
 689     opts = g_malloc0(sizeof(*opts));
 690     opts->id = g_strdup(id);
 691     opts->list = list;
 692     loc_save(&opts->loc);
 693     QTAILQ_INIT(&opts->head);
 694     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 695     return opts;
 696 }
 697
 698 void qemu_opts_reset(QemuOptsList *list)
 699 {
 700     QemuOpts *opts, *next_opts;
 701
 702     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 703         qemu_opts_del(opts);
 704     }
 705 }
 706
 707 void qemu_opts_loc_restore(QemuOpts *opts)
 708 {
 709     loc_restore(&opts->loc);
 710 }
 711
 712 void qemu_opts_set(QemuOptsList *list, const char *id,
 713                    const char *name, const char *value, Error **errp)
 714 {
 715     QemuOpts *opts;
 716     Error *local_err = NULL;
 717
 718     opts = qemu_opts_create(list, id, 1, &local_err);
 719     if (local_err) {
 720         error_propagate(errp, local_err);
 721         return;
 722     }
 723     qemu_opt_set(opts, name, value, errp);
 724 }
 725
 726 const char *qemu_opts_id(QemuOpts *opts)
 727 {
 728     return opts->id;
 729 }
 730
 731 /* The id string will be g_free()d by qemu_opts_del */
 732 void qemu_opts_set_id(QemuOpts *opts, char *id)
 733 {
 734     opts->id = id;
 735 }
 736
 737 void qemu_opts_del(QemuOpts *opts)
 738 {
 739     QemuOpt *opt;
 740
 741     if (opts == NULL) {
 742         return;
 743     }
 744
 745     for (;;) {
 746         opt = QTAILQ_FIRST(&opts->head);
 747         if (opt == NULL)
 748             break;
 749         qemu_opt_del(opt);
 750     }
 751     QTAILQ_REMOVE(&opts->list->head, opts, next);
 752     g_free(opts->id);
 753     g_free(opts);
 754 }
 755
 756 /* print value, escaping any commas in value */
 757 static void escaped_print(const char *value)
 758 {
 759     const char *ptr;
 760
 761     for (ptr = value; *ptr; ++ptr) {
 762         if (*ptr == ',') {
 763             putchar(',');
 764         }
 765         putchar(*ptr);
 766     }
 767 }
 768
 769 void qemu_opts_print(QemuOpts *opts, const char *separator)
 770 {
 771     QemuOpt *opt;
 772     QemuOptDesc *desc = opts->list->desc;
 773     const char *sep = "";
 774
 775     if (opts->id) {
 776         printf("id=%s", opts->id); /* passed id_wellformed -> no commas */
 777         sep = separator;
 778     }
 779
 780     if (desc[0].name == NULL) {
 781         QTAILQ_FOREACH(opt, &opts->head, next) {
 782             printf("%s%s=", sep, opt->name);
 783             escaped_print(opt->str);
 784             sep = separator;
 785         }
 786         return;
 787     }
 788     for (; desc && desc->name; desc++) {
 789         const char *value;
 790         opt = qemu_opt_find(opts, desc->name);
 791
 792         value = opt ? opt->str : desc->def_value_str;
 793         if (!value) {
 794             continue;
 795         }
 796         if (desc->type == QEMU_OPT_STRING) {
 797             printf("%s%s=", sep, desc->name);
 798             escaped_print(value);
 799         } else if ((desc->type == QEMU_OPT_SIZE ||
 800                     desc->type == QEMU_OPT_NUMBER) && opt) {
 801             printf("%s%s=%" PRId64, sep, desc->name, opt->value.uint);
 802         } else {
 803             printf("%s%s=%s", sep, desc->name, value);
 804         }
 805         sep = separator;
 806     }
 807 }
 808
 809 static void opts_do_parse(QemuOpts *opts, const char *params,
 810                           const char *firstname, bool prepend,
 811                           bool *invalidp, Error **errp)
 812 {
 813     char *option = NULL;
 814     char *value = NULL;
 815     const char *p,*pe,*pc;
 816     Error *local_err = NULL;
 817
 818     for (p = params; *p != '\0'; p++) {
 819         pe = strchr(p, '=');
 820         pc = strchr(p, ',');
 821         if (!pe || (pc && pc < pe)) {
 822             /* found "foo,more" */
 823             if (p == params && firstname) {
 824                 /* implicitly named first option */
 825                 option = g_strdup(firstname);
 826                 p = get_opt_value(p, &value);
 827             } else {
 828                 /* option without value, probably a flag */
 829                 p = get_opt_name(p, &option, ',');
 830                 if (strncmp(option, "no", 2) == 0) {
 831                     memmove(option, option+2, strlen(option+2)+1);
 832                     value = g_strdup("off");
 833                 } else {
 834                     value = g_strdup("on");
 835                 }
 836             }
 837         } else {
 838             /* found "foo=bar,more" */
 839             p = get_opt_name(p, &option, '=');
 840             assert(*p == '=');
 841             p++;
 842             p = get_opt_value(p, &value);
 843         }
 844         if (strcmp(option, "id") != 0) {
 845             /* store and parse */
 846             opt_set(opts, option, value, prepend, invalidp, &local_err);
 847             value = NULL;
 848             if (local_err) {
 849                 error_propagate(errp, local_err);
 850                 goto cleanup;
 851             }
 852         }
 853         if (*p != ',') {
 854             break;
 855         }
 856         g_free(option);
 857         g_free(value);
 858         option = value = NULL;
 859     }
 860
 861  cleanup:
 862     g_free(option);
 863     g_free(value);
 864 }
 865
 866 /**
 867  * Store options parsed from @params into @opts.
 868  * If @firstname is non-null, the first key=value in @params may omit
 869  * key=, and is treated as if key was @firstname.
 870  * On error, store an error object through @errp if non-null.
 871  */
 872 void qemu_opts_do_parse(QemuOpts *opts, const char *params,
 873                        const char *firstname, Error **errp)
 874 {
 875     opts_do_parse(opts, params, firstname, false, NULL, errp);
 876 }
 877
 878 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 879                             bool permit_abbrev, bool defaults,
 880                             bool *invalidp, Error **errp)
 881 {
 882     const char *firstname;
 883     char *id = NULL;
 884     const char *p;
 885     QemuOpts *opts;
 886     Error *local_err = NULL;
 887
 888     assert(!permit_abbrev || list->implied_opt_name);
 889     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 890
 891     if (strncmp(params, "id=", 3) == 0) {
 892         get_opt_value(params + 3, &id);
 893     } else if ((p = strstr(params, ",id=")) != NULL) {
 894         get_opt_value(p + 4, &id);
 895     }
 896
 897     /*
 898      * This code doesn't work for defaults && !list->merge_lists: when
 899      * params has no id=, and list has an element with !opts->id, it
 900      * appends a new element instead of returning the existing opts.
 901      * However, we got no use for this case.  Guard against possible
 902      * (if unlikely) future misuse:
 903      */
 904     assert(!defaults || list->merge_lists);
 905     opts = qemu_opts_create(list, id, !defaults, &local_err);
 906     g_free(id);
 907     if (opts == NULL) {
 908         error_propagate(errp, local_err);
 909         return NULL;
 910     }
 911
 912     opts_do_parse(opts, params, firstname, defaults, invalidp, &local_err);
 913     if (local_err) {
 914         error_propagate(errp, local_err);
 915         qemu_opts_del(opts);
 916         return NULL;
 917     }
 918
 919     return opts;
 920 }
 921
 922 /**
 923  * Create a QemuOpts in @list and with options parsed from @params.
 924  * If @permit_abbrev, the first key=value in @params may omit key=,
 925  * and is treated as if key was @list->implied_opt_name.
 926  * On error, store an error object through @errp if non-null.
 927  * Return the new QemuOpts on success, null pointer on error.
 928  */
 929 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 930                           bool permit_abbrev, Error **errp)
 931 {
 932     return opts_parse(list, params, permit_abbrev, false, NULL, errp);
 933 }
 934
 935 /**
 936  * Create a QemuOpts in @list and with options parsed from @params.
 937  * If @permit_abbrev, the first key=value in @params may omit key=,
 938  * and is treated as if key was @list->implied_opt_name.
 939  * Report errors with error_report_err().  This is inappropriate in
 940  * QMP context.  Do not use this function there!
 941  * Return the new QemuOpts on success, null pointer on error.
 942  */
 943 QemuOpts *qemu_opts_parse_noisily(QemuOptsList *list, const char *params,
 944                                   bool permit_abbrev)
 945 {
 946     Error *err = NULL;
 947     QemuOpts *opts;
 948     bool invalidp = false;
 949
 950     opts = opts_parse(list, params, permit_abbrev, false, &invalidp, &err);
 951     if (err) {
 952         if (invalidp && has_help_option(params)) {
 953             qemu_opts_print_help(list, true);
 954             error_free(err);
 955         } else {
 956             error_report_err(err);
 957         }
 958     }
 959     return opts;
 960 }
 961
 962 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 963                             int permit_abbrev)
 964 {
 965     QemuOpts *opts;
 966
 967     opts = opts_parse(list, params, permit_abbrev, true, NULL, NULL);
 968     assert(opts);
 969 }
 970
 971 typedef struct OptsFromQDictState {
 972     QemuOpts *opts;
 973     Error **errp;
 974 } OptsFromQDictState;
 975
 976 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 977 {
 978     OptsFromQDictState *state = opaque;
 979     char buf[32], *tmp = NULL;
 980     const char *value;
 981
 982     if (!strcmp(key, "id") || *state->errp) {
 983         return;
 984     }
 985
 986     switch (qobject_type(obj)) {
 987     case QTYPE_QSTRING:
 988         value = qstring_get_str(qobject_to(QString, obj));
 989         break;
 990     case QTYPE_QNUM:
 991         tmp = qnum_to_string(qobject_to(QNum, obj));
 992         value = tmp;
 993         break;
 994     case QTYPE_QBOOL:
 995         pstrcpy(buf, sizeof(buf),
 996                 qbool_get_bool(qobject_to(QBool, obj)) ? "on" : "off");
 997         value = buf;
 998         break;
 999     default:
1000         return;
1001     }
1002
1003     qemu_opt_set(state->opts, key, value, state->errp);
1004     g_free(tmp);
1005 }
1006
1007 /*
1008  * Create QemuOpts from a QDict.
1009  * Use value of key "id" as ID if it exists and is a QString.  Only
1010  * QStrings, QNums and QBools are copied.  Entries with other types
1011  * are silently ignored.
1012  */
1013 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
1014                                Error **errp)
1015 {
1016     OptsFromQDictState state;
1017     Error *local_err = NULL;
1018     QemuOpts *opts;
1019
1020     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
1021                             &local_err);
1022     if (local_err) {
1023         error_propagate(errp, local_err);
1024         return NULL;
1025     }
1026
1027     assert(opts != NULL);
1028
1029     state.errp = &local_err;
1030     state.opts = opts;
1031     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
1032     if (local_err) {
1033         error_propagate(errp, local_err);
1034         qemu_opts_del(opts);
1035         return NULL;
1036     }
1037
1038     return opts;
1039 }
1040
1041 /*
1042  * Adds all QDict entries to the QemuOpts that can be added and removes them
1043  * from the QDict. When this function returns, the QDict contains only those
1044  * entries that couldn't be added to the QemuOpts.
1045  */
1046 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
1047 {
1048     const QDictEntry *entry, *next;
1049
1050     entry = qdict_first(qdict);
1051
1052     while (entry != NULL) {
1053         Error *local_err = NULL;
1054         OptsFromQDictState state = {
1055             .errp = &local_err,
1056             .opts = opts,
1057         };
1058
1059         next = qdict_next(qdict, entry);
1060
1061         if (find_desc_by_name(opts->list->desc, entry->key)) {
1062             qemu_opts_from_qdict_1(entry->key, entry->value, &state);
1063             if (local_err) {
1064                 error_propagate(errp, local_err);
1065                 return;
1066             } else {
1067                 qdict_del(qdict, entry->key);
1068             }
1069         }
1070
1071         entry = next;
1072     }
1073 }
1074
1075 /*
1076  * Convert from QemuOpts to QDict. The QDict values are of type QString.
1077  *
1078  * If @list is given, only add those options to the QDict that are contained in
1079  * the list. If @del is true, any options added to the QDict are removed from
1080  * the QemuOpts, otherwise they remain there.
1081  *
1082  * If two options in @opts have the same name, they are processed in order
1083  * so that the last one wins (consistent with the reverse iteration in
1084  * qemu_opt_find()), but all of them are deleted if @del is true.
1085  *
1086  * TODO We'll want to use types appropriate for opt->desc->type, but
1087  * this is enough for now.
1088  */
1089 QDict *qemu_opts_to_qdict_filtered(QemuOpts *opts, QDict *qdict,
1090                                    QemuOptsList *list, bool del)
1091 {
1092     QemuOpt *opt, *next;
1093
1094     if (!qdict) {
1095         qdict = qdict_new();
1096     }
1097     if (opts->id) {
1098         qdict_put_str(qdict, "id", opts->id);
1099     }
1100     QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next) {
1101         if (list) {
1102             QemuOptDesc *desc;
1103             bool found = false;
1104             for (desc = list->desc; desc->name; desc++) {
1105                 if (!strcmp(desc->name, opt->name)) {
1106                     found = true;
1107                     break;
1108                 }
1109             }
1110             if (!found) {
1111                 continue;
1112             }
1113         }
1114         qdict_put_str(qdict, opt->name, opt->str);
1115         if (del) {
1116             qemu_opt_del(opt);
1117         }
1118     }
1119     return qdict;
1120 }
1121
1122 /* Copy all options in a QemuOpts to the given QDict. See
1123  * qemu_opts_to_qdict_filtered() for details. */
1124 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1125 {
1126     return qemu_opts_to_qdict_filtered(opts, qdict, NULL, false);
1127 }
1128
1129 /* Validate parsed opts against descriptions where no
1130  * descriptions were provided in the QemuOptsList.
1131  */
1132 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1133 {
1134     QemuOpt *opt;
1135     Error *local_err = NULL;
1136
1137     assert(opts_accepts_any(opts));
1138
1139     QTAILQ_FOREACH(opt, &opts->head, next) {
1140         opt->desc = find_desc_by_name(desc, opt->name);
1141         if (!opt->desc) {
1142             error_setg(errp, QERR_INVALID_PARAMETER, opt->name);
1143             return;
1144         }
1145
1146         qemu_opt_parse(opt, &local_err);
1147         if (local_err) {
1148             error_propagate(errp, local_err);
1149             return;
1150         }
1151     }
1152 }
1153
1154 /**
1155  * For each member of @list, call @func(@opaque, member, @errp).
1156  * Call it with the current location temporarily set to the member's.
1157  * @func() may store an Error through @errp, but must return non-zero then.
1158  * When @func() returns non-zero, break the loop and return that value.
1159  * Return zero when the loop completes.
1160  */
1161 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
1162                       void *opaque, Error **errp)
1163 {
1164     Location loc;
1165     QemuOpts *opts;
1166     int rc = 0;
1167
1168     loc_push_none(&loc);
1169     QTAILQ_FOREACH(opts, &list->head, next) {
1170         loc_restore(&opts->loc);
1171         rc = func(opaque, opts, errp);
1172         if (rc) {
1173             break;
1174         }
1175         assert(!errp || !*errp);
1176     }
1177     loc_pop(&loc);
1178     return rc;
1179 }
1180
1181 static size_t count_opts_list(QemuOptsList *list)
1182 {
1183     QemuOptDesc *desc = NULL;
1184     size_t num_opts = 0;
1185
1186     if (!list) {
1187         return 0;
1188     }
1189
1190     desc = list->desc;
1191     while (desc && desc->name) {
1192         num_opts++;
1193         desc++;
1194     }
1195
1196     return num_opts;
1197 }
1198
1199 void qemu_opts_free(QemuOptsList *list)
1200 {
1201     g_free(list);
1202 }
1203
1204 /* Realloc dst option list and append options from an option list (list)
1205  * to it. dst could be NULL or a malloced list.
1206  * The lifetime of dst must be shorter than the input list because the
1207  * QemuOptDesc->name, ->help, and ->def_value_str strings are shared.
1208  */
1209 QemuOptsList *qemu_opts_append(QemuOptsList *dst,
1210                                QemuOptsList *list)
1211 {
1212     size_t num_opts, num_dst_opts;
1213     QemuOptDesc *desc;
1214     bool need_init = false;
1215     bool need_head_update;
1216
1217     if (!list) {
1218         return dst;
1219     }
1220
1221     /* If dst is NULL, after realloc, some area of dst should be initialized
1222      * before adding options to it.
1223      */
1224     if (!dst) {
1225         need_init = true;
1226         need_head_update = true;
1227     } else {
1228         /* Moreover, even if dst is not NULL, the realloc may move it to a
1229          * different address in which case we may get a stale tail pointer
1230          * in dst->head. */
1231         need_head_update = QTAILQ_EMPTY(&dst->head);
1232     }
1233
1234     num_opts = count_opts_list(dst);
1235     num_dst_opts = num_opts;
1236     num_opts += count_opts_list(list);
1237     dst = g_realloc(dst, sizeof(QemuOptsList) +
1238                     (num_opts + 1) * sizeof(QemuOptDesc));
1239     if (need_init) {
1240         dst->name = NULL;
1241         dst->implied_opt_name = NULL;
1242         dst->merge_lists = false;
1243     }
1244     if (need_head_update) {
1245         QTAILQ_INIT(&dst->head);
1246     }
1247     dst->desc[num_dst_opts].name = NULL;
1248
1249     /* append list->desc to dst->desc */
1250     if (list) {
1251         desc = list->desc;
1252         while (desc && desc->name) {
1253             if (find_desc_by_name(dst->desc, desc->name) == NULL) {
1254                 dst->desc[num_dst_opts++] = *desc;
1255                 dst->desc[num_dst_opts].name = NULL;
1256             }
1257             desc++;
1258         }
1259     }
1260
1261     return dst;
1262 }