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/types.h"
  32 #include "qapi/qmp/qerror.h"
  33 #include "qemu/option_int.h"
  34 #include "qemu/cutils.h"
  35 #include "qemu/id.h"
  36 #include "qemu/help_option.h"
  37
  38 /*
  39  * Extracts the name of an option from the parameter string (p points at the
  40  * first byte of the option name)
  41  *
  42  * The option name is delimited by delim (usually , or =) or the string end
  43  * and is copied into buf. If the option name is longer than buf_size, it is
  44  * truncated. buf is always zero terminated.
  45  *
  46  * The return value is the position of the delimiter/zero byte after the option
  47  * name in p.
  48  */
  49 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim)
  50 {
  51     char *q;
  52
  53     q = buf;
  54     while (*p != '\0' && *p != delim) {
  55         if (q && (q - buf) < buf_size - 1)
  56             *q++ = *p;
  57         p++;
  58     }
  59     if (q)
  60         *q = '\0';
  61
  62     return p;
  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(char *buf, int buf_size, const char *p)
  74 {
  75     char *q;
  76
  77     q = buf;
  78     while (*p != '\0') {
  79         if (*p == ',') {
  80             if (*(p + 1) != ',')
  81                 break;
  82             p++;
  83         }
  84         if (q && (q - buf) < buf_size - 1)
  85             *q++ = *p;
  86         p++;
  87     }
  88     if (q)
  89         *q = '\0';
  90
  91     return p;
  92 }
  93
  94 int get_next_param_value(char *buf, int buf_size,
  95                          const char *tag, const char **pstr)
  96 {
  97     const char *p;
  98     char option[128];
  99
 100     p = *pstr;
 101     for(;;) {
 102         p = get_opt_name(option, sizeof(option), p, '=');
 103         if (*p != '=')
 104             break;
 105         p++;
 106         if (!strcmp(tag, option)) {
 107             *pstr = get_opt_value(buf, buf_size, p);
 108             if (**pstr == ',') {
 109                 (*pstr)++;
 110             }
 111             return strlen(buf);
 112         } else {
 113             p = get_opt_value(NULL, 0, p);
 114         }
 115         if (*p != ',')
 116             break;
 117         p++;
 118     }
 119     return 0;
 120 }
 121
 122 int get_param_value(char *buf, int buf_size,
 123                     const char *tag, const char *str)
 124 {
 125     return get_next_param_value(buf, buf_size, tag, &str);
 126 }
 127
 128 static void parse_option_bool(const char *name, const char *value, bool *ret,
 129                               Error **errp)
 130 {
 131     if (!strcmp(value, "on")) {
 132         *ret = 1;
 133     } else if (!strcmp(value, "off")) {
 134         *ret = 0;
 135     } else {
 136         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 137                    name, "'on' or 'off'");
 138     }
 139 }
 140
 141 static void parse_option_number(const char *name, const char *value,
 142                                 uint64_t *ret, Error **errp)
 143 {
 144     uint64_t number;
 145     int err;
 146
 147     err = qemu_strtou64(value, NULL, 0, &number);
 148     if (err == -ERANGE) {
 149         error_setg(errp, "Value '%s' is too large for parameter '%s'",
 150                    value, name);
 151         return;
 152     }
 153     if (err) {
 154         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 155         return;
 156     }
 157     *ret = number;
 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     uint64_t size;
 178     int err;
 179
 180     err = qemu_strtosz(value, NULL, &size);
 181     if (err == -ERANGE) {
 182         error_setg(errp, "Value '%s' is out of range for parameter '%s'",
 183                    value, name);
 184         return;
 185     }
 186     if (err) {
 187         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
 188                    "a non-negative number below 2^64");
 189         error_append_hint(errp, "Optional suffix k, M, G, T, P or E means"
 190                           " kilo-, mega-, giga-, tera-, peta-\n"
 191                           "and exabytes, respectively.\n");
 192         return;
 193     }
 194     *ret = size;
 195 }
 196
 197 bool has_help_option(const char *param)
 198 {
 199     size_t buflen = strlen(param) + 1;
 200     char *buf = g_malloc(buflen);
 201     const char *p = param;
 202     bool result = false;
 203
 204     while (*p) {
 205         p = get_opt_value(buf, buflen, p);
 206         if (*p) {
 207             p++;
 208         }
 209
 210         if (is_help_option(buf)) {
 211             result = true;
 212             goto out;
 213         }
 214     }
 215
 216 out:
 217     g_free(buf);
 218     return result;
 219 }
 220
 221 bool is_valid_option_list(const char *param)
 222 {
 223     size_t buflen = strlen(param) + 1;
 224     char *buf = g_malloc(buflen);
 225     const char *p = param;
 226     bool result = true;
 227
 228     while (*p) {
 229         p = get_opt_value(buf, buflen, p);
 230         if (*p && !*++p) {
 231             result = false;
 232             goto out;
 233         }
 234
 235         if (!*buf || *buf == ',') {
 236             result = false;
 237             goto out;
 238         }
 239     }
 240
 241 out:
 242     g_free(buf);
 243     return result;
 244 }
 245
 246 void qemu_opts_print_help(QemuOptsList *list)
 247 {
 248     QemuOptDesc *desc;
 249
 250     assert(list);
 251     desc = list->desc;
 252     printf("Supported options:\n");
 253     while (desc && desc->name) {
 254         printf("%-16s %s\n", desc->name,
 255                desc->help ? desc->help : "No description available");
 256         desc++;
 257     }
 258 }
 259 /* ------------------------------------------------------------------ */
 260
 261 QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 262 {
 263     QemuOpt *opt;
 264
 265     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 266         if (strcmp(opt->name, name) != 0)
 267             continue;
 268         return opt;
 269     }
 270     return NULL;
 271 }
 272
 273 static void qemu_opt_del(QemuOpt *opt)
 274 {
 275     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 276     g_free(opt->name);
 277     g_free(opt->str);
 278     g_free(opt);
 279 }
 280
 281 /* qemu_opt_set allows many settings for the same option.
 282  * This function deletes all settings for an option.
 283  */
 284 static void qemu_opt_del_all(QemuOpts *opts, const char *name)
 285 {
 286     QemuOpt *opt, *next_opt;
 287
 288     QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next_opt) {
 289         if (!strcmp(opt->name, name)) {
 290             qemu_opt_del(opt);
 291         }
 292     }
 293 }
 294
 295 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 296 {
 297     QemuOpt *opt;
 298
 299     if (opts == NULL) {
 300         return NULL;
 301     }
 302
 303     opt = qemu_opt_find(opts, name);
 304     if (!opt) {
 305         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 306         if (desc && desc->def_value_str) {
 307             return desc->def_value_str;
 308         }
 309     }
 310     return opt ? opt->str : NULL;
 311 }
 312
 313 void qemu_opt_iter_init(QemuOptsIter *iter, QemuOpts *opts, const char *name)
 314 {
 315     iter->opts = opts;
 316     iter->opt = QTAILQ_FIRST(&opts->head);
 317     iter->name = name;
 318 }
 319
 320 const char *qemu_opt_iter_next(QemuOptsIter *iter)
 321 {
 322     QemuOpt *ret = iter->opt;
 323     if (iter->name) {
 324         while (ret && !g_str_equal(iter->name, ret->name)) {
 325             ret = QTAILQ_NEXT(ret, next);
 326         }
 327     }
 328     iter->opt = ret ? QTAILQ_NEXT(ret, next) : NULL;
 329     return ret ? ret->str : NULL;
 330 }
 331
 332 /* Get a known option (or its default) and remove it from the list
 333  * all in one action. Return a malloced string of the option value.
 334  * Result must be freed by caller with g_free().
 335  */
 336 char *qemu_opt_get_del(QemuOpts *opts, const char *name)
 337 {
 338     QemuOpt *opt;
 339     const QemuOptDesc *desc;
 340     char *str = NULL;
 341
 342     if (opts == NULL) {
 343         return NULL;
 344     }
 345
 346     opt = qemu_opt_find(opts, name);
 347     if (!opt) {
 348         desc = find_desc_by_name(opts->list->desc, name);
 349         if (desc && desc->def_value_str) {
 350             str = g_strdup(desc->def_value_str);
 351         }
 352         return str;
 353     }
 354     str = opt->str;
 355     opt->str = NULL;
 356     qemu_opt_del_all(opts, name);
 357     return str;
 358 }
 359
 360 bool qemu_opt_has_help_opt(QemuOpts *opts)
 361 {
 362     QemuOpt *opt;
 363
 364     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 365         if (is_help_option(opt->name)) {
 366             return true;
 367         }
 368     }
 369     return false;
 370 }
 371
 372 static bool qemu_opt_get_bool_helper(QemuOpts *opts, const char *name,
 373                                      bool defval, bool del)
 374 {
 375     QemuOpt *opt;
 376     bool ret = defval;
 377
 378     if (opts == NULL) {
 379         return ret;
 380     }
 381
 382     opt = qemu_opt_find(opts, name);
 383     if (opt == NULL) {
 384         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 385         if (desc && desc->def_value_str) {
 386             parse_option_bool(name, desc->def_value_str, &ret, &error_abort);
 387         }
 388         return ret;
 389     }
 390     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 391     ret = opt->value.boolean;
 392     if (del) {
 393         qemu_opt_del_all(opts, name);
 394     }
 395     return ret;
 396 }
 397
 398 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 399 {
 400     return qemu_opt_get_bool_helper(opts, name, defval, false);
 401 }
 402
 403 bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval)
 404 {
 405     return qemu_opt_get_bool_helper(opts, name, defval, true);
 406 }
 407
 408 static uint64_t qemu_opt_get_number_helper(QemuOpts *opts, const char *name,
 409                                            uint64_t defval, bool del)
 410 {
 411     QemuOpt *opt;
 412     uint64_t ret = defval;
 413
 414     if (opts == NULL) {
 415         return ret;
 416     }
 417
 418     opt = qemu_opt_find(opts, name);
 419     if (opt == NULL) {
 420         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 421         if (desc && desc->def_value_str) {
 422             parse_option_number(name, desc->def_value_str, &ret, &error_abort);
 423         }
 424         return ret;
 425     }
 426     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 427     ret = opt->value.uint;
 428     if (del) {
 429         qemu_opt_del_all(opts, name);
 430     }
 431     return ret;
 432 }
 433
 434 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 435 {
 436     return qemu_opt_get_number_helper(opts, name, defval, false);
 437 }
 438
 439 uint64_t qemu_opt_get_number_del(QemuOpts *opts, const char *name,
 440                                  uint64_t defval)
 441 {
 442     return qemu_opt_get_number_helper(opts, name, defval, true);
 443 }
 444
 445 static uint64_t qemu_opt_get_size_helper(QemuOpts *opts, const char *name,
 446                                          uint64_t defval, bool del)
 447 {
 448     QemuOpt *opt;
 449     uint64_t ret = defval;
 450
 451     if (opts == NULL) {
 452         return ret;
 453     }
 454
 455     opt = qemu_opt_find(opts, name);
 456     if (opt == NULL) {
 457         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 458         if (desc && desc->def_value_str) {
 459             parse_option_size(name, desc->def_value_str, &ret, &error_abort);
 460         }
 461         return ret;
 462     }
 463     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 464     ret = opt->value.uint;
 465     if (del) {
 466         qemu_opt_del_all(opts, name);
 467     }
 468     return ret;
 469 }
 470
 471 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 472 {
 473     return qemu_opt_get_size_helper(opts, name, defval, false);
 474 }
 475
 476 uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name,
 477                                uint64_t defval)
 478 {
 479     return qemu_opt_get_size_helper(opts, name, defval, true);
 480 }
 481
 482 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
 483 {
 484     if (opt->desc == NULL)
 485         return;
 486
 487     switch (opt->desc->type) {
 488     case QEMU_OPT_STRING:
 489         /* nothing */
 490         return;
 491     case QEMU_OPT_BOOL:
 492         parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
 493         break;
 494     case QEMU_OPT_NUMBER:
 495         parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
 496         break;
 497     case QEMU_OPT_SIZE:
 498         parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
 499         break;
 500     default:
 501         abort();
 502     }
 503 }
 504
 505 static bool opts_accepts_any(const QemuOpts *opts)
 506 {
 507     return opts->list->desc[0].name == NULL;
 508 }
 509
 510 int qemu_opt_unset(QemuOpts *opts, const char *name)
 511 {
 512     QemuOpt *opt = qemu_opt_find(opts, name);
 513
 514     assert(opts_accepts_any(opts));
 515
 516     if (opt == NULL) {
 517         return -1;
 518     } else {
 519         qemu_opt_del(opt);
 520         return 0;
 521     }
 522 }
 523
 524 static void opt_set(QemuOpts *opts, const char *name, const char *value,
 525                     bool prepend, Error **errp)
 526 {
 527     QemuOpt *opt;
 528     const QemuOptDesc *desc;
 529     Error *local_err = NULL;
 530
 531     desc = find_desc_by_name(opts->list->desc, name);
 532     if (!desc && !opts_accepts_any(opts)) {
 533         error_setg(errp, QERR_INVALID_PARAMETER, name);
 534         return;
 535     }
 536
 537     opt = g_malloc0(sizeof(*opt));
 538     opt->name = g_strdup(name);
 539     opt->opts = opts;
 540     if (prepend) {
 541         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 542     } else {
 543         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 544     }
 545     opt->desc = desc;
 546     opt->str = g_strdup(value);
 547     assert(opt->str);
 548     qemu_opt_parse(opt, &local_err);
 549     if (local_err) {
 550         error_propagate(errp, local_err);
 551         qemu_opt_del(opt);
 552     }
 553 }
 554
 555 void qemu_opt_set(QemuOpts *opts, const char *name, const char *value,
 556                   Error **errp)
 557 {
 558     opt_set(opts, name, value, false, errp);
 559 }
 560
 561 void qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val,
 562                        Error **errp)
 563 {
 564     QemuOpt *opt;
 565     const QemuOptDesc *desc = opts->list->desc;
 566
 567     opt = g_malloc0(sizeof(*opt));
 568     opt->desc = find_desc_by_name(desc, name);
 569     if (!opt->desc && !opts_accepts_any(opts)) {
 570         error_setg(errp, QERR_INVALID_PARAMETER, name);
 571         g_free(opt);
 572         return;
 573     }
 574
 575     opt->name = g_strdup(name);
 576     opt->opts = opts;
 577     opt->value.boolean = !!val;
 578     opt->str = g_strdup(val ? "on" : "off");
 579     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 580 }
 581
 582 void qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t 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.uint = val;
 599     opt->str = g_strdup_printf("%" PRId64, val);
 600     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 601 }
 602
 603 /**
 604  * For each member of @opts, call @func(@opaque, name, value, @errp).
 605  * @func() may store an Error through @errp, but must return non-zero then.
 606  * When @func() returns non-zero, break the loop and return that value.
 607  * Return zero when the loop completes.
 608  */
 609 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 610                      Error **errp)
 611 {
 612     QemuOpt *opt;
 613     int rc;
 614
 615     QTAILQ_FOREACH(opt, &opts->head, next) {
 616         rc = func(opaque, opt->name, opt->str, errp);
 617         if (rc) {
 618             return rc;
 619         }
 620         assert(!errp || !*errp);
 621     }
 622     return 0;
 623 }
 624
 625 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 626 {
 627     QemuOpts *opts;
 628
 629     QTAILQ_FOREACH(opts, &list->head, next) {
 630         if (!opts->id && !id) {
 631             return opts;
 632         }
 633         if (opts->id && id && !strcmp(opts->id, id)) {
 634             return opts;
 635         }
 636     }
 637     return NULL;
 638 }
 639
 640 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 641                            int fail_if_exists, Error **errp)
 642 {
 643     QemuOpts *opts = NULL;
 644
 645     if (id) {
 646         if (!id_wellformed(id)) {
 647             error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id",
 648                        "an identifier");
 649             error_append_hint(errp, "Identifiers consist of letters, digits, "
 650                               "'-', '.', '_', starting with a letter.\n");
 651             return NULL;
 652         }
 653         opts = qemu_opts_find(list, id);
 654         if (opts != NULL) {
 655             if (fail_if_exists && !list->merge_lists) {
 656                 error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
 657                 return NULL;
 658             } else {
 659                 return opts;
 660             }
 661         }
 662     } else if (list->merge_lists) {
 663         opts = qemu_opts_find(list, NULL);
 664         if (opts) {
 665             return opts;
 666         }
 667     }
 668     opts = g_malloc0(sizeof(*opts));
 669     opts->id = g_strdup(id);
 670     opts->list = list;
 671     loc_save(&opts->loc);
 672     QTAILQ_INIT(&opts->head);
 673     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 674     return opts;
 675 }
 676
 677 void qemu_opts_reset(QemuOptsList *list)
 678 {
 679     QemuOpts *opts, *next_opts;
 680
 681     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 682         qemu_opts_del(opts);
 683     }
 684 }
 685
 686 void qemu_opts_loc_restore(QemuOpts *opts)
 687 {
 688     loc_restore(&opts->loc);
 689 }
 690
 691 void qemu_opts_set(QemuOptsList *list, const char *id,
 692                    const char *name, const char *value, Error **errp)
 693 {
 694     QemuOpts *opts;
 695     Error *local_err = NULL;
 696
 697     opts = qemu_opts_create(list, id, 1, &local_err);
 698     if (local_err) {
 699         error_propagate(errp, local_err);
 700         return;
 701     }
 702     qemu_opt_set(opts, name, value, errp);
 703 }
 704
 705 const char *qemu_opts_id(QemuOpts *opts)
 706 {
 707     return opts->id;
 708 }
 709
 710 /* The id string will be g_free()d by qemu_opts_del */
 711 void qemu_opts_set_id(QemuOpts *opts, char *id)
 712 {
 713     opts->id = id;
 714 }
 715
 716 void qemu_opts_del(QemuOpts *opts)
 717 {
 718     QemuOpt *opt;
 719
 720     if (opts == NULL) {
 721         return;
 722     }
 723
 724     for (;;) {
 725         opt = QTAILQ_FIRST(&opts->head);
 726         if (opt == NULL)
 727             break;
 728         qemu_opt_del(opt);
 729     }
 730     QTAILQ_REMOVE(&opts->list->head, opts, next);
 731     g_free(opts->id);
 732     g_free(opts);
 733 }
 734
 735 /* print value, escaping any commas in value */
 736 static void escaped_print(const char *value)
 737 {
 738     const char *ptr;
 739
 740     for (ptr = value; *ptr; ++ptr) {
 741         if (*ptr == ',') {
 742             putchar(',');
 743         }
 744         putchar(*ptr);
 745     }
 746 }
 747
 748 void qemu_opts_print(QemuOpts *opts, const char *separator)
 749 {
 750     QemuOpt *opt;
 751     QemuOptDesc *desc = opts->list->desc;
 752     const char *sep = "";
 753
 754     if (opts->id) {
 755         printf("id=%s", opts->id); /* passed id_wellformed -> no commas */
 756         sep = separator;
 757     }
 758
 759     if (desc[0].name == NULL) {
 760         QTAILQ_FOREACH(opt, &opts->head, next) {
 761             printf("%s%s=", sep, opt->name);
 762             escaped_print(opt->str);
 763             sep = separator;
 764         }
 765         return;
 766     }
 767     for (; desc && desc->name; desc++) {
 768         const char *value;
 769         QemuOpt *opt = qemu_opt_find(opts, desc->name);
 770
 771         value = opt ? opt->str : desc->def_value_str;
 772         if (!value) {
 773             continue;
 774         }
 775         if (desc->type == QEMU_OPT_STRING) {
 776             printf("%s%s=", sep, desc->name);
 777             escaped_print(value);
 778         } else if ((desc->type == QEMU_OPT_SIZE ||
 779                     desc->type == QEMU_OPT_NUMBER) && opt) {
 780             printf("%s%s=%" PRId64, sep, desc->name, opt->value.uint);
 781         } else {
 782             printf("%s%s=%s", sep, desc->name, value);
 783         }
 784         sep = separator;
 785     }
 786 }
 787
 788 static void opts_do_parse(QemuOpts *opts, const char *params,
 789                           const char *firstname, bool prepend, Error **errp)
 790 {
 791     char option[128], value[1024];
 792     const char *p,*pe,*pc;
 793     Error *local_err = NULL;
 794
 795     /* Initialize data to 0 to avoid warnings from Valgrind. */
 796     memset(option, 0, sizeof(option));
 797     memset(value, 0, sizeof(value));
 798
 799     for (p = params; *p != '\0'; p++) {
 800         pe = strchr(p, '=');
 801         pc = strchr(p, ',');
 802         if (!pe || (pc && pc < pe)) {
 803             /* found "foo,more" */
 804             if (p == params && firstname) {
 805                 /* implicitly named first option */
 806                 pstrcpy(option, sizeof(option), firstname);
 807                 p = get_opt_value(value, sizeof(value), p);
 808             } else {
 809                 /* option without value, probably a flag */
 810                 p = get_opt_name(option, sizeof(option), p, ',');
 811                 if (strncmp(option, "no", 2) == 0) {
 812                     memmove(option, option+2, strlen(option+2)+1);
 813                     pstrcpy(value, sizeof(value), "off");
 814                 } else {
 815                     pstrcpy(value, sizeof(value), "on");
 816                 }
 817             }
 818         } else {
 819             /* found "foo=bar,more" */
 820             p = get_opt_name(option, sizeof(option), p, '=');
 821             if (*p != '=') {
 822                 break;
 823             }
 824             p++;
 825             p = get_opt_value(value, sizeof(value), p);
 826         }
 827         if (strcmp(option, "id") != 0) {
 828             /* store and parse */
 829             opt_set(opts, option, value, prepend, &local_err);
 830             if (local_err) {
 831                 error_propagate(errp, local_err);
 832                 return;
 833             }
 834         }
 835         if (*p != ',') {
 836             break;
 837         }
 838     }
 839 }
 840
 841 /**
 842  * Store options parsed from @params into @opts.
 843  * If @firstname is non-null, the first key=value in @params may omit
 844  * key=, and is treated as if key was @firstname.
 845  * On error, store an error object through @errp if non-null.
 846  */
 847 void qemu_opts_do_parse(QemuOpts *opts, const char *params,
 848                        const char *firstname, Error **errp)
 849 {
 850     opts_do_parse(opts, params, firstname, false, errp);
 851 }
 852
 853 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 854                             bool permit_abbrev, bool defaults, Error **errp)
 855 {
 856     const char *firstname;
 857     char value[1024], *id = NULL;
 858     const char *p;
 859     QemuOpts *opts;
 860     Error *local_err = NULL;
 861
 862     assert(!permit_abbrev || list->implied_opt_name);
 863     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 864
 865     if (strncmp(params, "id=", 3) == 0) {
 866         get_opt_value(value, sizeof(value), params+3);
 867         id = value;
 868     } else if ((p = strstr(params, ",id=")) != NULL) {
 869         get_opt_value(value, sizeof(value), p+4);
 870         id = value;
 871     }
 872
 873     /*
 874      * This code doesn't work for defaults && !list->merge_lists: when
 875      * params has no id=, and list has an element with !opts->id, it
 876      * appends a new element instead of returning the existing opts.
 877      * However, we got no use for this case.  Guard against possible
 878      * (if unlikely) future misuse:
 879      */
 880     assert(!defaults || list->merge_lists);
 881     opts = qemu_opts_create(list, id, !defaults, &local_err);
 882     if (opts == NULL) {
 883         error_propagate(errp, local_err);
 884         return NULL;
 885     }
 886
 887     opts_do_parse(opts, params, firstname, defaults, &local_err);
 888     if (local_err) {
 889         error_propagate(errp, local_err);
 890         qemu_opts_del(opts);
 891         return NULL;
 892     }
 893
 894     return opts;
 895 }
 896
 897 /**
 898  * Create a QemuOpts in @list and with options parsed from @params.
 899  * If @permit_abbrev, the first key=value in @params may omit key=,
 900  * and is treated as if key was @list->implied_opt_name.
 901  * On error, store an error object through @errp if non-null.
 902  * Return the new QemuOpts on success, null pointer on error.
 903  */
 904 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 905                           bool permit_abbrev, Error **errp)
 906 {
 907     return opts_parse(list, params, permit_abbrev, false, errp);
 908 }
 909
 910 /**
 911  * Create a QemuOpts in @list and with options parsed from @params.
 912  * If @permit_abbrev, the first key=value in @params may omit key=,
 913  * and is treated as if key was @list->implied_opt_name.
 914  * Report errors with error_report_err().  This is inappropriate in
 915  * QMP context.  Do not use this function there!
 916  * Return the new QemuOpts on success, null pointer on error.
 917  */
 918 QemuOpts *qemu_opts_parse_noisily(QemuOptsList *list, const char *params,
 919                                   bool permit_abbrev)
 920 {
 921     Error *err = NULL;
 922     QemuOpts *opts;
 923
 924     opts = opts_parse(list, params, permit_abbrev, false, &err);
 925     if (err) {
 926         error_report_err(err);
 927     }
 928     return opts;
 929 }
 930
 931 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 932                             int permit_abbrev)
 933 {
 934     QemuOpts *opts;
 935
 936     opts = opts_parse(list, params, permit_abbrev, true, NULL);
 937     assert(opts);
 938 }
 939
 940 typedef struct OptsFromQDictState {
 941     QemuOpts *opts;
 942     Error **errp;
 943 } OptsFromQDictState;
 944
 945 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 946 {
 947     OptsFromQDictState *state = opaque;
 948     char buf[32], *tmp = NULL;
 949     const char *value;
 950
 951     if (!strcmp(key, "id") || *state->errp) {
 952         return;
 953     }
 954
 955     switch (qobject_type(obj)) {
 956     case QTYPE_QSTRING:
 957         value = qstring_get_str(qobject_to_qstring(obj));
 958         break;
 959     case QTYPE_QNUM:
 960         tmp = qnum_to_string(qobject_to_qnum(obj));
 961         value = tmp;
 962         break;
 963     case QTYPE_QBOOL:
 964         pstrcpy(buf, sizeof(buf),
 965                 qbool_get_bool(qobject_to_qbool(obj)) ? "on" : "off");
 966         value = buf;
 967         break;
 968     default:
 969         return;
 970     }
 971
 972     qemu_opt_set(state->opts, key, value, state->errp);
 973     g_free(tmp);
 974 }
 975
 976 /*
 977  * Create QemuOpts from a QDict.
 978  * Use value of key "id" as ID if it exists and is a QString.  Only
 979  * QStrings, QNums and QBools are copied.  Entries with other types
 980  * are silently ignored.
 981  */
 982 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
 983                                Error **errp)
 984 {
 985     OptsFromQDictState state;
 986     Error *local_err = NULL;
 987     QemuOpts *opts;
 988
 989     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
 990                             &local_err);
 991     if (local_err) {
 992         error_propagate(errp, local_err);
 993         return NULL;
 994     }
 995
 996     assert(opts != NULL);
 997
 998     state.errp = &local_err;
 999     state.opts = opts;
1000     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
1001     if (local_err) {
1002         error_propagate(errp, local_err);
1003         qemu_opts_del(opts);
1004         return NULL;
1005     }
1006
1007     return opts;
1008 }
1009
1010 /*
1011  * Adds all QDict entries to the QemuOpts that can be added and removes them
1012  * from the QDict. When this function returns, the QDict contains only those
1013  * entries that couldn't be added to the QemuOpts.
1014  */
1015 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
1016 {
1017     const QDictEntry *entry, *next;
1018
1019     entry = qdict_first(qdict);
1020
1021     while (entry != NULL) {
1022         Error *local_err = NULL;
1023         OptsFromQDictState state = {
1024             .errp = &local_err,
1025             .opts = opts,
1026         };
1027
1028         next = qdict_next(qdict, entry);
1029
1030         if (find_desc_by_name(opts->list->desc, entry->key)) {
1031             qemu_opts_from_qdict_1(entry->key, entry->value, &state);
1032             if (local_err) {
1033                 error_propagate(errp, local_err);
1034                 return;
1035             } else {
1036                 qdict_del(qdict, entry->key);
1037             }
1038         }
1039
1040         entry = next;
1041     }
1042 }
1043
1044 /*
1045  * Convert from QemuOpts to QDict.
1046  * The QDict values are of type QString.
1047  * TODO We'll want to use types appropriate for opt->desc->type, but
1048  * this is enough for now.
1049  */
1050 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1051 {
1052     QemuOpt *opt;
1053
1054     if (!qdict) {
1055         qdict = qdict_new();
1056     }
1057     if (opts->id) {
1058         qdict_put_str(qdict, "id", opts->id);
1059     }
1060     QTAILQ_FOREACH(opt, &opts->head, next) {
1061         qdict_put_str(qdict, opt->name, opt->str);
1062     }
1063     return qdict;
1064 }
1065
1066 /* Validate parsed opts against descriptions where no
1067  * descriptions were provided in the QemuOptsList.
1068  */
1069 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1070 {
1071     QemuOpt *opt;
1072     Error *local_err = NULL;
1073
1074     assert(opts_accepts_any(opts));
1075
1076     QTAILQ_FOREACH(opt, &opts->head, next) {
1077         opt->desc = find_desc_by_name(desc, opt->name);
1078         if (!opt->desc) {
1079             error_setg(errp, QERR_INVALID_PARAMETER, opt->name);
1080             return;
1081         }
1082
1083         qemu_opt_parse(opt, &local_err);
1084         if (local_err) {
1085             error_propagate(errp, local_err);
1086             return;
1087         }
1088     }
1089 }
1090
1091 /**
1092  * For each member of @list, call @func(@opaque, member, @errp).
1093  * Call it with the current location temporarily set to the member's.
1094  * @func() may store an Error through @errp, but must return non-zero then.
1095  * When @func() returns non-zero, break the loop and return that value.
1096  * Return zero when the loop completes.
1097  */
1098 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
1099                       void *opaque, Error **errp)
1100 {
1101     Location loc;
1102     QemuOpts *opts;
1103     int rc = 0;
1104
1105     loc_push_none(&loc);
1106     QTAILQ_FOREACH(opts, &list->head, next) {
1107         loc_restore(&opts->loc);
1108         rc = func(opaque, opts, errp);
1109         if (rc) {
1110             break;
1111         }
1112         assert(!errp || !*errp);
1113     }
1114     loc_pop(&loc);
1115     return rc;
1116 }
1117
1118 static size_t count_opts_list(QemuOptsList *list)
1119 {
1120     QemuOptDesc *desc = NULL;
1121     size_t num_opts = 0;
1122
1123     if (!list) {
1124         return 0;
1125     }
1126
1127     desc = list->desc;
1128     while (desc && desc->name) {
1129         num_opts++;
1130         desc++;
1131     }
1132
1133     return num_opts;
1134 }
1135
1136 void qemu_opts_free(QemuOptsList *list)
1137 {
1138     g_free(list);
1139 }
1140
1141 /* Realloc dst option list and append options from an option list (list)
1142  * to it. dst could be NULL or a malloced list.
1143  * The lifetime of dst must be shorter than the input list because the
1144  * QemuOptDesc->name, ->help, and ->def_value_str strings are shared.
1145  */
1146 QemuOptsList *qemu_opts_append(QemuOptsList *dst,
1147                                QemuOptsList *list)
1148 {
1149     size_t num_opts, num_dst_opts;
1150     QemuOptDesc *desc;
1151     bool need_init = false;
1152     bool need_head_update;
1153
1154     if (!list) {
1155         return dst;
1156     }
1157
1158     /* If dst is NULL, after realloc, some area of dst should be initialized
1159      * before adding options to it.
1160      */
1161     if (!dst) {
1162         need_init = true;
1163         need_head_update = true;
1164     } else {
1165         /* Moreover, even if dst is not NULL, the realloc may move it to a
1166          * different address in which case we may get a stale tail pointer
1167          * in dst->head. */
1168         need_head_update = QTAILQ_EMPTY(&dst->head);
1169     }
1170
1171     num_opts = count_opts_list(dst);
1172     num_dst_opts = num_opts;
1173     num_opts += count_opts_list(list);
1174     dst = g_realloc(dst, sizeof(QemuOptsList) +
1175                     (num_opts + 1) * sizeof(QemuOptDesc));
1176     if (need_init) {
1177         dst->name = NULL;
1178         dst->implied_opt_name = NULL;
1179         dst->merge_lists = false;
1180     }
1181     if (need_head_update) {
1182         QTAILQ_INIT(&dst->head);
1183     }
1184     dst->desc[num_dst_opts].name = NULL;
1185
1186     /* append list->desc to dst->desc */
1187     if (list) {
1188         desc = list->desc;
1189         while (desc && desc->name) {
1190             if (find_desc_by_name(dst->desc, desc->name) == NULL) {
1191                 dst->desc[num_dst_opts++] = *desc;
1192                 dst->desc[num_dst_opts].name = NULL;
1193             }
1194             desc++;
1195         }
1196     }
1197
1198     return dst;
1199 }