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 = qemu_opt_find(opts, name);
 314
 315     if (!opt) {
 316         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 317         if (desc && desc->def_value_str) {
 318             return desc->def_value_str;
 319         }
 320     }
 321     return opt ? opt->str : NULL;
 322 }
 323
 324 /* Get a known option (or its default) and remove it from the list
 325  * all in one action. Return a malloced string of the option value.
 326  * Result must be freed by caller with g_free().
 327  */
 328 char *qemu_opt_get_del(QemuOpts *opts, const char *name)
 329 {
 330     QemuOpt *opt;
 331     const QemuOptDesc *desc;
 332     char *str = NULL;
 333
 334     if (opts == NULL) {
 335         return NULL;
 336     }
 337
 338     opt = qemu_opt_find(opts, name);
 339     if (!opt) {
 340         desc = find_desc_by_name(opts->list->desc, name);
 341         if (desc && desc->def_value_str) {
 342             str = g_strdup(desc->def_value_str);
 343         }
 344         return str;
 345     }
 346     str = opt->str;
 347     opt->str = NULL;
 348     qemu_opt_del_all(opts, name);
 349     return str;
 350 }
 351
 352 bool qemu_opt_has_help_opt(QemuOpts *opts)
 353 {
 354     QemuOpt *opt;
 355
 356     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 357         if (is_help_option(opt->name)) {
 358             return true;
 359         }
 360     }
 361     return false;
 362 }
 363
 364 static bool qemu_opt_get_bool_helper(QemuOpts *opts, const char *name,
 365                                      bool defval, bool del)
 366 {
 367     QemuOpt *opt = qemu_opt_find(opts, name);
 368     bool ret = defval;
 369
 370     if (opt == NULL) {
 371         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 372         if (desc && desc->def_value_str) {
 373             parse_option_bool(name, desc->def_value_str, &ret, &error_abort);
 374         }
 375         return ret;
 376     }
 377     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 378     ret = opt->value.boolean;
 379     if (del) {
 380         qemu_opt_del_all(opts, name);
 381     }
 382     return ret;
 383 }
 384
 385 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 386 {
 387     return qemu_opt_get_bool_helper(opts, name, defval, false);
 388 }
 389
 390 bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval)
 391 {
 392     return qemu_opt_get_bool_helper(opts, name, defval, true);
 393 }
 394
 395 static uint64_t qemu_opt_get_number_helper(QemuOpts *opts, const char *name,
 396                                            uint64_t defval, bool del)
 397 {
 398     QemuOpt *opt = qemu_opt_find(opts, name);
 399     uint64_t ret = defval;
 400
 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_number(name, desc->def_value_str, &ret, &error_abort);
 405         }
 406         return ret;
 407     }
 408     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 409     ret = opt->value.uint;
 410     if (del) {
 411         qemu_opt_del_all(opts, name);
 412     }
 413     return ret;
 414 }
 415
 416 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 417 {
 418     return qemu_opt_get_number_helper(opts, name, defval, false);
 419 }
 420
 421 uint64_t qemu_opt_get_number_del(QemuOpts *opts, const char *name,
 422                                  uint64_t defval)
 423 {
 424     return qemu_opt_get_number_helper(opts, name, defval, true);
 425 }
 426
 427 static uint64_t qemu_opt_get_size_helper(QemuOpts *opts, const char *name,
 428                                          uint64_t defval, bool del)
 429 {
 430     QemuOpt *opt = qemu_opt_find(opts, name);
 431     uint64_t ret = defval;
 432
 433     if (opt == NULL) {
 434         const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
 435         if (desc && desc->def_value_str) {
 436             parse_option_size(name, desc->def_value_str, &ret, &error_abort);
 437         }
 438         return ret;
 439     }
 440     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 441     ret = opt->value.uint;
 442     if (del) {
 443         qemu_opt_del_all(opts, name);
 444     }
 445     return ret;
 446 }
 447
 448 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 449 {
 450     return qemu_opt_get_size_helper(opts, name, defval, false);
 451 }
 452
 453 uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name,
 454                                uint64_t defval)
 455 {
 456     return qemu_opt_get_size_helper(opts, name, defval, true);
 457 }
 458
 459 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
 460 {
 461     if (opt->desc == NULL)
 462         return;
 463
 464     switch (opt->desc->type) {
 465     case QEMU_OPT_STRING:
 466         /* nothing */
 467         return;
 468     case QEMU_OPT_BOOL:
 469         parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
 470         break;
 471     case QEMU_OPT_NUMBER:
 472         parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
 473         break;
 474     case QEMU_OPT_SIZE:
 475         parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
 476         break;
 477     default:
 478         abort();
 479     }
 480 }
 481
 482 static bool opts_accepts_any(const QemuOpts *opts)
 483 {
 484     return opts->list->desc[0].name == NULL;
 485 }
 486
 487 int qemu_opt_unset(QemuOpts *opts, const char *name)
 488 {
 489     QemuOpt *opt = qemu_opt_find(opts, name);
 490
 491     assert(opts_accepts_any(opts));
 492
 493     if (opt == NULL) {
 494         return -1;
 495     } else {
 496         qemu_opt_del(opt);
 497         return 0;
 498     }
 499 }
 500
 501 static void opt_set(QemuOpts *opts, const char *name, const char *value,
 502                     bool prepend, Error **errp)
 503 {
 504     QemuOpt *opt;
 505     const QemuOptDesc *desc;
 506     Error *local_err = NULL;
 507
 508     desc = find_desc_by_name(opts->list->desc, name);
 509     if (!desc && !opts_accepts_any(opts)) {
 510         error_set(errp, QERR_INVALID_PARAMETER, name);
 511         return;
 512     }
 513
 514     opt = g_malloc0(sizeof(*opt));
 515     opt->name = g_strdup(name);
 516     opt->opts = opts;
 517     if (prepend) {
 518         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 519     } else {
 520         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 521     }
 522     opt->desc = desc;
 523     opt->str = g_strdup(value);
 524     qemu_opt_parse(opt, &local_err);
 525     if (local_err) {
 526         error_propagate(errp, local_err);
 527         qemu_opt_del(opt);
 528     }
 529 }
 530
 531 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 532 {
 533     Error *local_err = NULL;
 534
 535     opt_set(opts, name, value, false, &local_err);
 536     if (local_err) {
 537         qerror_report_err(local_err);
 538         error_free(local_err);
 539         return -1;
 540     }
 541
 542     return 0;
 543 }
 544
 545 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 546                       Error **errp)
 547 {
 548     opt_set(opts, name, value, false, errp);
 549 }
 550
 551 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 552 {
 553     QemuOpt *opt;
 554     const QemuOptDesc *desc = opts->list->desc;
 555
 556     opt = g_malloc0(sizeof(*opt));
 557     opt->desc = find_desc_by_name(desc, name);
 558     if (!opt->desc && !opts_accepts_any(opts)) {
 559         qerror_report(QERR_INVALID_PARAMETER, name);
 560         g_free(opt);
 561         return -1;
 562     }
 563
 564     opt->name = g_strdup(name);
 565     opt->opts = opts;
 566     opt->value.boolean = !!val;
 567     opt->str = g_strdup(val ? "on" : "off");
 568     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 569
 570     return 0;
 571 }
 572
 573 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val)
 574 {
 575     QemuOpt *opt;
 576     const QemuOptDesc *desc = opts->list->desc;
 577
 578     opt = g_malloc0(sizeof(*opt));
 579     opt->desc = find_desc_by_name(desc, name);
 580     if (!opt->desc && !opts_accepts_any(opts)) {
 581         qerror_report(QERR_INVALID_PARAMETER, name);
 582         g_free(opt);
 583         return -1;
 584     }
 585
 586     opt->name = g_strdup(name);
 587     opt->opts = opts;
 588     opt->value.uint = val;
 589     opt->str = g_strdup_printf("%" PRId64, val);
 590     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 591
 592     return 0;
 593 }
 594
 595 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 596                      int abort_on_failure)
 597 {
 598     QemuOpt *opt;
 599     int rc = 0;
 600
 601     QTAILQ_FOREACH(opt, &opts->head, next) {
 602         rc = func(opt->name, opt->str, opaque);
 603         if (abort_on_failure  &&  rc != 0)
 604             break;
 605     }
 606     return rc;
 607 }
 608
 609 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 610 {
 611     QemuOpts *opts;
 612
 613     QTAILQ_FOREACH(opts, &list->head, next) {
 614         if (!opts->id && !id) {
 615             return opts;
 616         }
 617         if (opts->id && id && !strcmp(opts->id, id)) {
 618             return opts;
 619         }
 620     }
 621     return NULL;
 622 }
 623
 624 static int id_wellformed(const char *id)
 625 {
 626     int i;
 627
 628     if (!qemu_isalpha(id[0])) {
 629         return 0;
 630     }
 631     for (i = 1; id[i]; i++) {
 632         if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
 633             return 0;
 634         }
 635     }
 636     return 1;
 637 }
 638
 639 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 640                            int fail_if_exists, Error **errp)
 641 {
 642     QemuOpts *opts = NULL;
 643
 644     if (id) {
 645         if (!id_wellformed(id)) {
 646             error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
 647 #if 0 /* conversion from qerror_report() to error_set() broke this: */
 648             error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
 649 #endif
 650             return NULL;
 651         }
 652         opts = qemu_opts_find(list, id);
 653         if (opts != NULL) {
 654             if (fail_if_exists && !list->merge_lists) {
 655                 error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
 656                 return NULL;
 657             } else {
 658                 return opts;
 659             }
 660         }
 661     } else if (list->merge_lists) {
 662         opts = qemu_opts_find(list, NULL);
 663         if (opts) {
 664             return opts;
 665         }
 666     }
 667     opts = g_malloc0(sizeof(*opts));
 668     opts->id = g_strdup(id);
 669     opts->list = list;
 670     loc_save(&opts->loc);
 671     QTAILQ_INIT(&opts->head);
 672     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 673     return opts;
 674 }
 675
 676 void qemu_opts_reset(QemuOptsList *list)
 677 {
 678     QemuOpts *opts, *next_opts;
 679
 680     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 681         qemu_opts_del(opts);
 682     }
 683 }
 684
 685 void qemu_opts_loc_restore(QemuOpts *opts)
 686 {
 687     loc_restore(&opts->loc);
 688 }
 689
 690 int qemu_opts_set(QemuOptsList *list, const char *id,
 691                   const char *name, const char *value)
 692 {
 693     QemuOpts *opts;
 694     Error *local_err = NULL;
 695
 696     opts = qemu_opts_create(list, id, 1, &local_err);
 697     if (local_err) {
 698         qerror_report_err(local_err);
 699         error_free(local_err);
 700         return -1;
 701     }
 702     return qemu_opt_set(opts, name, value);
 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 void qemu_opts_print(QemuOpts *opts)
 736 {
 737     QemuOpt *opt;
 738     QemuOptDesc *desc = opts->list->desc;
 739
 740     if (desc[0].name == NULL) {
 741         QTAILQ_FOREACH(opt, &opts->head, next) {
 742             printf("%s=\"%s\" ", opt->name, opt->str);
 743         }
 744         return;
 745     }
 746     for (; desc && desc->name; desc++) {
 747         const char *value;
 748         QemuOpt *opt = qemu_opt_find(opts, desc->name);
 749
 750         value = opt ? opt->str : desc->def_value_str;
 751         if (!value) {
 752             continue;
 753         }
 754         if (desc->type == QEMU_OPT_STRING) {
 755             printf("%s='%s' ", desc->name, value);
 756         } else if ((desc->type == QEMU_OPT_SIZE ||
 757                     desc->type == QEMU_OPT_NUMBER) && opt) {
 758             printf("%s=%" PRId64 " ", desc->name, opt->value.uint);
 759         } else {
 760             printf("%s=%s ", desc->name, value);
 761         }
 762     }
 763 }
 764
 765 static int opts_do_parse(QemuOpts *opts, const char *params,
 766                          const char *firstname, bool prepend)
 767 {
 768     char option[128], value[1024];
 769     const char *p,*pe,*pc;
 770     Error *local_err = NULL;
 771
 772     for (p = params; *p != '\0'; p++) {
 773         pe = strchr(p, '=');
 774         pc = strchr(p, ',');
 775         if (!pe || (pc && pc < pe)) {
 776             /* found "foo,more" */
 777             if (p == params && firstname) {
 778                 /* implicitly named first option */
 779                 pstrcpy(option, sizeof(option), firstname);
 780                 p = get_opt_value(value, sizeof(value), p);
 781             } else {
 782                 /* option without value, probably a flag */
 783                 p = get_opt_name(option, sizeof(option), p, ',');
 784                 if (strncmp(option, "no", 2) == 0) {
 785                     memmove(option, option+2, strlen(option+2)+1);
 786                     pstrcpy(value, sizeof(value), "off");
 787                 } else {
 788                     pstrcpy(value, sizeof(value), "on");
 789                 }
 790             }
 791         } else {
 792             /* found "foo=bar,more" */
 793             p = get_opt_name(option, sizeof(option), p, '=');
 794             if (*p != '=') {
 795                 break;
 796             }
 797             p++;
 798             p = get_opt_value(value, sizeof(value), p);
 799         }
 800         if (strcmp(option, "id") != 0) {
 801             /* store and parse */
 802             opt_set(opts, option, value, prepend, &local_err);
 803             if (local_err) {
 804                 qerror_report_err(local_err);
 805                 error_free(local_err);
 806                 return -1;
 807             }
 808         }
 809         if (*p != ',') {
 810             break;
 811         }
 812     }
 813     return 0;
 814 }
 815
 816 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 817 {
 818     return opts_do_parse(opts, params, firstname, false);
 819 }
 820
 821 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 822                             int permit_abbrev, bool defaults)
 823 {
 824     const char *firstname;
 825     char value[1024], *id = NULL;
 826     const char *p;
 827     QemuOpts *opts;
 828     Error *local_err = NULL;
 829
 830     assert(!permit_abbrev || list->implied_opt_name);
 831     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 832
 833     if (strncmp(params, "id=", 3) == 0) {
 834         get_opt_value(value, sizeof(value), params+3);
 835         id = value;
 836     } else if ((p = strstr(params, ",id=")) != NULL) {
 837         get_opt_value(value, sizeof(value), p+4);
 838         id = value;
 839     }
 840
 841     /*
 842      * This code doesn't work for defaults && !list->merge_lists: when
 843      * params has no id=, and list has an element with !opts->id, it
 844      * appends a new element instead of returning the existing opts.
 845      * However, we got no use for this case.  Guard against possible
 846      * (if unlikely) future misuse:
 847      */
 848     assert(!defaults || list->merge_lists);
 849     opts = qemu_opts_create(list, id, !defaults, &local_err);
 850     if (opts == NULL) {
 851         if (local_err) {
 852             qerror_report_err(local_err);
 853             error_free(local_err);
 854         }
 855         return NULL;
 856     }
 857
 858     if (opts_do_parse(opts, params, firstname, defaults) != 0) {
 859         qemu_opts_del(opts);
 860         return NULL;
 861     }
 862
 863     return opts;
 864 }
 865
 866 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
 867                           int permit_abbrev)
 868 {
 869     return opts_parse(list, params, permit_abbrev, false);
 870 }
 871
 872 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 873                             int permit_abbrev)
 874 {
 875     QemuOpts *opts;
 876
 877     opts = opts_parse(list, params, permit_abbrev, true);
 878     assert(opts);
 879 }
 880
 881 typedef struct OptsFromQDictState {
 882     QemuOpts *opts;
 883     Error **errp;
 884 } OptsFromQDictState;
 885
 886 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
 887 {
 888     OptsFromQDictState *state = opaque;
 889     char buf[32];
 890     const char *value;
 891     int n;
 892
 893     if (!strcmp(key, "id") || *state->errp) {
 894         return;
 895     }
 896
 897     switch (qobject_type(obj)) {
 898     case QTYPE_QSTRING:
 899         value = qstring_get_str(qobject_to_qstring(obj));
 900         break;
 901     case QTYPE_QINT:
 902         n = snprintf(buf, sizeof(buf), "%" PRId64,
 903                      qint_get_int(qobject_to_qint(obj)));
 904         assert(n < sizeof(buf));
 905         value = buf;
 906         break;
 907     case QTYPE_QFLOAT:
 908         n = snprintf(buf, sizeof(buf), "%.17g",
 909                      qfloat_get_double(qobject_to_qfloat(obj)));
 910         assert(n < sizeof(buf));
 911         value = buf;
 912         break;
 913     case QTYPE_QBOOL:
 914         pstrcpy(buf, sizeof(buf),
 915                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
 916         value = buf;
 917         break;
 918     default:
 919         return;
 920     }
 921
 922     qemu_opt_set_err(state->opts, key, value, state->errp);
 923 }
 924
 925 /*
 926  * Create QemuOpts from a QDict.
 927  * Use value of key "id" as ID if it exists and is a QString.
 928  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
 929  * other types are silently ignored.
 930  */
 931 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
 932                                Error **errp)
 933 {
 934     OptsFromQDictState state;
 935     Error *local_err = NULL;
 936     QemuOpts *opts;
 937
 938     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
 939                             &local_err);
 940     if (local_err) {
 941         error_propagate(errp, local_err);
 942         return NULL;
 943     }
 944
 945     assert(opts != NULL);
 946
 947     state.errp = &local_err;
 948     state.opts = opts;
 949     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
 950     if (local_err) {
 951         error_propagate(errp, local_err);
 952         qemu_opts_del(opts);
 953         return NULL;
 954     }
 955
 956     return opts;
 957 }
 958
 959 /*
 960  * Adds all QDict entries to the QemuOpts that can be added and removes them
 961  * from the QDict. When this function returns, the QDict contains only those
 962  * entries that couldn't be added to the QemuOpts.
 963  */
 964 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
 965 {
 966     const QDictEntry *entry, *next;
 967
 968     entry = qdict_first(qdict);
 969
 970     while (entry != NULL) {
 971         Error *local_err = NULL;
 972         OptsFromQDictState state = {
 973             .errp = &local_err,
 974             .opts = opts,
 975         };
 976
 977         next = qdict_next(qdict, entry);
 978
 979         if (find_desc_by_name(opts->list->desc, entry->key)) {
 980             qemu_opts_from_qdict_1(entry->key, entry->value, &state);
 981             if (local_err) {
 982                 error_propagate(errp, local_err);
 983                 return;
 984             } else {
 985                 qdict_del(qdict, entry->key);
 986             }
 987         }
 988
 989         entry = next;
 990     }
 991 }
 992
 993 /*
 994  * Convert from QemuOpts to QDict.
 995  * The QDict values are of type QString.
 996  * TODO We'll want to use types appropriate for opt->desc->type, but
 997  * this is enough for now.
 998  */
 999 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1000 {
1001     QemuOpt *opt;
1002     QObject *val;
1003
1004     if (!qdict) {
1005         qdict = qdict_new();
1006     }
1007     if (opts->id) {
1008         qdict_put(qdict, "id", qstring_from_str(opts->id));
1009     }
1010     QTAILQ_FOREACH(opt, &opts->head, next) {
1011         val = QOBJECT(qstring_from_str(opt->str));
1012         qdict_put_obj(qdict, opt->name, val);
1013     }
1014     return qdict;
1015 }
1016
1017 /* Validate parsed opts against descriptions where no
1018  * descriptions were provided in the QemuOptsList.
1019  */
1020 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1021 {
1022     QemuOpt *opt;
1023     Error *local_err = NULL;
1024
1025     assert(opts_accepts_any(opts));
1026
1027     QTAILQ_FOREACH(opt, &opts->head, next) {
1028         opt->desc = find_desc_by_name(desc, opt->name);
1029         if (!opt->desc) {
1030             error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1031             return;
1032         }
1033
1034         qemu_opt_parse(opt, &local_err);
1035         if (local_err) {
1036             error_propagate(errp, local_err);
1037             return;
1038         }
1039     }
1040 }
1041
1042 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1043                       int abort_on_failure)
1044 {
1045     Location loc;
1046     QemuOpts *opts;
1047     int rc = 0;
1048
1049     loc_push_none(&loc);
1050     QTAILQ_FOREACH(opts, &list->head, next) {
1051         loc_restore(&opts->loc);
1052         rc |= func(opts, opaque);
1053         if (abort_on_failure  &&  rc != 0)
1054             break;
1055     }
1056     loc_pop(&loc);
1057     return rc;
1058 }
1059
1060 static size_t count_opts_list(QemuOptsList *list)
1061 {
1062     QemuOptDesc *desc = NULL;
1063     size_t num_opts = 0;
1064
1065     if (!list) {
1066         return 0;
1067     }
1068
1069     desc = list->desc;
1070     while (desc && desc->name) {
1071         num_opts++;
1072         desc++;
1073     }
1074
1075     return num_opts;
1076 }
1077
1078 void qemu_opts_free(QemuOptsList *list)
1079 {
1080     g_free(list);
1081 }
1082
1083 /* Realloc dst option list and append options from an option list (list)
1084  * to it. dst could be NULL or a malloced list.
1085  * The lifetime of dst must be shorter than the input list because the
1086  * QemuOptDesc->name, ->help, and ->def_value_str strings are shared.
1087  */
1088 QemuOptsList *qemu_opts_append(QemuOptsList *dst,
1089                                QemuOptsList *list)
1090 {
1091     size_t num_opts, num_dst_opts;
1092     QemuOptDesc *desc;
1093     bool need_init = false;
1094
1095     if (!list) {
1096         return dst;
1097     }
1098
1099     /* If dst is NULL, after realloc, some area of dst should be initialized
1100      * before adding options to it.
1101      */
1102     if (!dst) {
1103         need_init = true;
1104     }
1105
1106     num_opts = count_opts_list(dst);
1107     num_dst_opts = num_opts;
1108     num_opts += count_opts_list(list);
1109     dst = g_realloc(dst, sizeof(QemuOptsList) +
1110                     (num_opts + 1) * sizeof(QemuOptDesc));
1111     if (need_init) {
1112         dst->name = NULL;
1113         dst->implied_opt_name = NULL;
1114         QTAILQ_INIT(&dst->head);
1115         dst->merge_lists = false;
1116     }
1117     dst->desc[num_dst_opts].name = NULL;
1118
1119     /* append list->desc to dst->desc */
1120     if (list) {
1121         desc = list->desc;
1122         while (desc && desc->name) {
1123             if (find_desc_by_name(dst->desc, desc->name) == NULL) {
1124                 dst->desc[num_dst_opts++] = *desc;
1125                 dst->desc[num_dst_opts].name = NULL;
1126             }
1127             desc++;
1128         }
1129     }
1130
1131     return dst;
1132 }