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 /*
 127  * Searches an option list for an option with the given name
 128  */
 129 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
 130     const char *name)
 131 {
 132     while (list && list->name) {
 133         if (!strcmp(list->name, name)) {
 134             return list;
 135         }
 136         list++;
 137     }
 138
 139     return NULL;
 140 }
 141
 142 static void parse_option_bool(const char *name, const char *value, bool *ret,
 143                               Error **errp)
 144 {
 145     if (value != NULL) {
 146         if (!strcmp(value, "on")) {
 147             *ret = 1;
 148         } else if (!strcmp(value, "off")) {
 149             *ret = 0;
 150         } else {
 151             error_set(errp,QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
 152         }
 153     } else {
 154         *ret = 1;
 155     }
 156 }
 157
 158 static void parse_option_number(const char *name, const char *value,
 159                                 uint64_t *ret, Error **errp)
 160 {
 161     char *postfix;
 162     uint64_t number;
 163
 164     if (value != NULL) {
 165         number = strtoull(value, &postfix, 0);
 166         if (*postfix != '\0') {
 167             error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 168             return;
 169         }
 170         *ret = number;
 171     } else {
 172         error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
 173     }
 174 }
 175
 176 void parse_option_size(const char *name, const char *value,
 177                        uint64_t *ret, Error **errp)
 178 {
 179     char *postfix;
 180     double sizef;
 181
 182     if (value != NULL) {
 183         sizef = strtod(value, &postfix);
 184         switch (*postfix) {
 185         case 'T':
 186             sizef *= 1024;
 187             /* fall through */
 188         case 'G':
 189             sizef *= 1024;
 190             /* fall through */
 191         case 'M':
 192             sizef *= 1024;
 193             /* fall through */
 194         case 'K':
 195         case 'k':
 196             sizef *= 1024;
 197             /* fall through */
 198         case 'b':
 199         case '\0':
 200             *ret = (uint64_t) sizef;
 201             break;
 202         default:
 203             error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
 204 #if 0 /* conversion from qerror_report() to error_set() broke this: */
 205             error_printf_unless_qmp("You may use k, M, G or T suffixes for "
 206                     "kilobytes, megabytes, gigabytes and terabytes.\n");
 207 #endif
 208             return;
 209         }
 210     } else {
 211         error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
 212     }
 213 }
 214
 215 /*
 216  * Sets the value of a parameter in a given option list. The parsing of the
 217  * value depends on the type of option:
 218  *
 219  * OPT_FLAG (uses value.n):
 220  *      If no value is given, the flag is set to 1.
 221  *      Otherwise the value must be "on" (set to 1) or "off" (set to 0)
 222  *
 223  * OPT_STRING (uses value.s):
 224  *      value is strdup()ed and assigned as option value
 225  *
 226  * OPT_SIZE (uses value.n):
 227  *      The value is converted to an integer. Suffixes for kilobytes etc. are
 228  *      allowed (powers of 1024).
 229  *
 230  * Returns 0 on succes, -1 in error cases
 231  */
 232 int set_option_parameter(QEMUOptionParameter *list, const char *name,
 233     const char *value)
 234 {
 235     bool flag;
 236     Error *local_err = NULL;
 237
 238     // Find a matching parameter
 239     list = get_option_parameter(list, name);
 240     if (list == NULL) {
 241         fprintf(stderr, "Unknown option '%s'\n", name);
 242         return -1;
 243     }
 244
 245     // Process parameter
 246     switch (list->type) {
 247     case OPT_FLAG:
 248         parse_option_bool(name, value, &flag, &local_err);
 249         if (!local_err) {
 250             list->value.n = flag;
 251         }
 252         break;
 253
 254     case OPT_STRING:
 255         if (value != NULL) {
 256             list->value.s = g_strdup(value);
 257         } else {
 258             fprintf(stderr, "Option '%s' needs a parameter\n", name);
 259             return -1;
 260         }
 261         break;
 262
 263     case OPT_SIZE:
 264         parse_option_size(name, value, &list->value.n, &local_err);
 265         break;
 266
 267     default:
 268         fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
 269         return -1;
 270     }
 271
 272     if (local_err) {
 273         qerror_report_err(local_err);
 274         error_free(local_err);
 275         return -1;
 276     }
 277
 278     list->assigned = true;
 279
 280     return 0;
 281 }
 282
 283 /*
 284  * Sets the given parameter to an integer instead of a string.
 285  * This function cannot be used to set string options.
 286  *
 287  * Returns 0 on success, -1 in error cases
 288  */
 289 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
 290     uint64_t value)
 291 {
 292     // Find a matching parameter
 293     list = get_option_parameter(list, name);
 294     if (list == NULL) {
 295         fprintf(stderr, "Unknown option '%s'\n", name);
 296         return -1;
 297     }
 298
 299     // Process parameter
 300     switch (list->type) {
 301     case OPT_FLAG:
 302     case OPT_NUMBER:
 303     case OPT_SIZE:
 304         list->value.n = value;
 305         break;
 306
 307     default:
 308         return -1;
 309     }
 310
 311     list->assigned = true;
 312
 313     return 0;
 314 }
 315
 316 /*
 317  * Frees a option list. If it contains strings, the strings are freed as well.
 318  */
 319 void free_option_parameters(QEMUOptionParameter *list)
 320 {
 321     QEMUOptionParameter *cur = list;
 322
 323     while (cur && cur->name) {
 324         if (cur->type == OPT_STRING) {
 325             g_free(cur->value.s);
 326         }
 327         cur++;
 328     }
 329
 330     g_free(list);
 331 }
 332
 333 /*
 334  * Count valid options in list
 335  */
 336 static size_t count_option_parameters(QEMUOptionParameter *list)
 337 {
 338     size_t num_options = 0;
 339
 340     while (list && list->name) {
 341         num_options++;
 342         list++;
 343     }
 344
 345     return num_options;
 346 }
 347
 348 /*
 349  * Append an option list (list) to an option list (dest).
 350  *
 351  * If dest is NULL, a new copy of list is created.
 352  *
 353  * Returns a pointer to the first element of dest (or the newly allocated copy)
 354  */
 355 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
 356     QEMUOptionParameter *list)
 357 {
 358     size_t num_options, num_dest_options;
 359
 360     num_options = count_option_parameters(dest);
 361     num_dest_options = num_options;
 362
 363     num_options += count_option_parameters(list);
 364
 365     dest = g_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
 366     dest[num_dest_options].name = NULL;
 367
 368     while (list && list->name) {
 369         if (get_option_parameter(dest, list->name) == NULL) {
 370             dest[num_dest_options++] = *list;
 371             dest[num_dest_options].name = NULL;
 372         }
 373         list++;
 374     }
 375
 376     return dest;
 377 }
 378
 379 /*
 380  * Parses a parameter string (param) into an option list (dest).
 381  *
 382  * list is the template option list. If dest is NULL, a new copy of list is
 383  * created. If list is NULL, this function fails.
 384  *
 385  * A parameter string consists of one or more parameters, separated by commas.
 386  * Each parameter consists of its name and possibly of a value. In the latter
 387  * case, the value is delimited by an = character. To specify a value which
 388  * contains commas, double each comma so it won't be recognized as the end of
 389  * the parameter.
 390  *
 391  * For more details of the parsing see above.
 392  *
 393  * Returns a pointer to the first element of dest (or the newly allocated copy)
 394  * or NULL in error cases
 395  */
 396 QEMUOptionParameter *parse_option_parameters(const char *param,
 397     QEMUOptionParameter *list, QEMUOptionParameter *dest)
 398 {
 399     QEMUOptionParameter *allocated = NULL;
 400     char name[256];
 401     char value[256];
 402     char *param_delim, *value_delim;
 403     char next_delim;
 404     int i;
 405
 406     if (list == NULL) {
 407         return NULL;
 408     }
 409
 410     if (dest == NULL) {
 411         dest = allocated = append_option_parameters(NULL, list);
 412     }
 413
 414     for (i = 0; dest[i].name; i++) {
 415         dest[i].assigned = false;
 416     }
 417
 418     while (*param) {
 419
 420         // Find parameter name and value in the string
 421         param_delim = strchr(param, ',');
 422         value_delim = strchr(param, '=');
 423
 424         if (value_delim && (value_delim < param_delim || !param_delim)) {
 425             next_delim = '=';
 426         } else {
 427             next_delim = ',';
 428             value_delim = NULL;
 429         }
 430
 431         param = get_opt_name(name, sizeof(name), param, next_delim);
 432         if (value_delim) {
 433             param = get_opt_value(value, sizeof(value), param + 1);
 434         }
 435         if (*param != '\0') {
 436             param++;
 437         }
 438
 439         // Set the parameter
 440         if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
 441             goto fail;
 442         }
 443     }
 444
 445     return dest;
 446
 447 fail:
 448     // Only free the list if it was newly allocated
 449     free_option_parameters(allocated);
 450     return NULL;
 451 }
 452
 453 bool has_help_option(const char *param)
 454 {
 455     size_t buflen = strlen(param) + 1;
 456     char *buf = g_malloc0(buflen);
 457     const char *p = param;
 458     bool result = false;
 459
 460     while (*p) {
 461         p = get_opt_value(buf, buflen, p);
 462         if (*p) {
 463             p++;
 464         }
 465
 466         if (is_help_option(buf)) {
 467             result = true;
 468             goto out;
 469         }
 470     }
 471
 472 out:
 473     free(buf);
 474     return result;
 475 }
 476
 477 bool is_valid_option_list(const char *param)
 478 {
 479     size_t buflen = strlen(param) + 1;
 480     char *buf = g_malloc0(buflen);
 481     const char *p = param;
 482     bool result = true;
 483
 484     while (*p) {
 485         p = get_opt_value(buf, buflen, p);
 486         if (*p && !*++p) {
 487             result = false;
 488             goto out;
 489         }
 490
 491         if (!*buf || *buf == ',') {
 492             result = false;
 493             goto out;
 494         }
 495     }
 496
 497 out:
 498     free(buf);
 499     return result;
 500 }
 501
 502 /*
 503  * Prints all options of a list that have a value to stdout
 504  */
 505 void print_option_parameters(QEMUOptionParameter *list)
 506 {
 507     while (list && list->name) {
 508         switch (list->type) {
 509             case OPT_STRING:
 510                  if (list->value.s != NULL) {
 511                      printf("%s='%s' ", list->name, list->value.s);
 512                  }
 513                 break;
 514             case OPT_FLAG:
 515                 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
 516                 break;
 517             case OPT_SIZE:
 518             case OPT_NUMBER:
 519                 printf("%s=%" PRId64 " ", list->name, list->value.n);
 520                 break;
 521             default:
 522                 printf("%s=(unknown type) ", list->name);
 523                 break;
 524         }
 525         list++;
 526     }
 527 }
 528
 529 /*
 530  * Prints an overview of all available options
 531  */
 532 void print_option_help(QEMUOptionParameter *list)
 533 {
 534     printf("Supported options:\n");
 535     while (list && list->name) {
 536         printf("%-16s %s\n", list->name,
 537             list->help ? list->help : "No description available");
 538         list++;
 539     }
 540 }
 541
 542 /* ------------------------------------------------------------------ */
 543
 544 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
 545 {
 546     QemuOpt *opt;
 547
 548     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 549         if (strcmp(opt->name, name) != 0)
 550             continue;
 551         return opt;
 552     }
 553     return NULL;
 554 }
 555
 556 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 557 {
 558     QemuOpt *opt = qemu_opt_find(opts, name);
 559     return opt ? opt->str : NULL;
 560 }
 561
 562 bool qemu_opt_has_help_opt(QemuOpts *opts)
 563 {
 564     QemuOpt *opt;
 565
 566     QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
 567         if (is_help_option(opt->name)) {
 568             return true;
 569         }
 570     }
 571     return false;
 572 }
 573
 574 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
 575 {
 576     QemuOpt *opt = qemu_opt_find(opts, name);
 577
 578     if (opt == NULL)
 579         return defval;
 580     assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
 581     return opt->value.boolean;
 582 }
 583
 584 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
 585 {
 586     QemuOpt *opt = qemu_opt_find(opts, name);
 587
 588     if (opt == NULL)
 589         return defval;
 590     assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
 591     return opt->value.uint;
 592 }
 593
 594 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
 595 {
 596     QemuOpt *opt = qemu_opt_find(opts, name);
 597
 598     if (opt == NULL)
 599         return defval;
 600     assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
 601     return opt->value.uint;
 602 }
 603
 604 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
 605 {
 606     if (opt->desc == NULL)
 607         return;
 608
 609     switch (opt->desc->type) {
 610     case QEMU_OPT_STRING:
 611         /* nothing */
 612         return;
 613     case QEMU_OPT_BOOL:
 614         parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
 615         break;
 616     case QEMU_OPT_NUMBER:
 617         parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
 618         break;
 619     case QEMU_OPT_SIZE:
 620         parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
 621         break;
 622     default:
 623         abort();
 624     }
 625 }
 626
 627 static void qemu_opt_del(QemuOpt *opt)
 628 {
 629     QTAILQ_REMOVE(&opt->opts->head, opt, next);
 630     g_free((/* !const */ char*)opt->name);
 631     g_free((/* !const */ char*)opt->str);
 632     g_free(opt);
 633 }
 634
 635 static bool opts_accepts_any(const QemuOpts *opts)
 636 {
 637     return opts->list->desc[0].name == NULL;
 638 }
 639
 640 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
 641                                             const char *name)
 642 {
 643     int i;
 644
 645     for (i = 0; desc[i].name != NULL; i++) {
 646         if (strcmp(desc[i].name, name) == 0) {
 647             return &desc[i];
 648         }
 649     }
 650
 651     return NULL;
 652 }
 653
 654 int qemu_opt_unset(QemuOpts *opts, const char *name)
 655 {
 656     QemuOpt *opt = qemu_opt_find(opts, name);
 657
 658     assert(opts_accepts_any(opts));
 659
 660     if (opt == NULL) {
 661         return -1;
 662     } else {
 663         qemu_opt_del(opt);
 664         return 0;
 665     }
 666 }
 667
 668 static void opt_set(QemuOpts *opts, const char *name, const char *value,
 669                     bool prepend, Error **errp)
 670 {
 671     QemuOpt *opt;
 672     const QemuOptDesc *desc;
 673     Error *local_err = NULL;
 674
 675     desc = find_desc_by_name(opts->list->desc, name);
 676     if (!desc && !opts_accepts_any(opts)) {
 677         error_set(errp, QERR_INVALID_PARAMETER, name);
 678         return;
 679     }
 680
 681     opt = g_malloc0(sizeof(*opt));
 682     opt->name = g_strdup(name);
 683     opt->opts = opts;
 684     if (prepend) {
 685         QTAILQ_INSERT_HEAD(&opts->head, opt, next);
 686     } else {
 687         QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 688     }
 689     opt->desc = desc;
 690     opt->str = g_strdup(value);
 691     qemu_opt_parse(opt, &local_err);
 692     if (local_err) {
 693         error_propagate(errp, local_err);
 694         qemu_opt_del(opt);
 695     }
 696 }
 697
 698 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
 699 {
 700     Error *local_err = NULL;
 701
 702     opt_set(opts, name, value, false, &local_err);
 703     if (local_err) {
 704         qerror_report_err(local_err);
 705         error_free(local_err);
 706         return -1;
 707     }
 708
 709     return 0;
 710 }
 711
 712 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 713                       Error **errp)
 714 {
 715     opt_set(opts, name, value, false, errp);
 716 }
 717
 718 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 719 {
 720     QemuOpt *opt;
 721     const QemuOptDesc *desc = opts->list->desc;
 722
 723     opt = g_malloc0(sizeof(*opt));
 724     opt->desc = find_desc_by_name(desc, name);
 725     if (!opt->desc && !opts_accepts_any(opts)) {
 726         qerror_report(QERR_INVALID_PARAMETER, name);
 727         g_free(opt);
 728         return -1;
 729     }
 730
 731     opt->name = g_strdup(name);
 732     opt->opts = opts;
 733     opt->value.boolean = !!val;
 734     opt->str = g_strdup(val ? "on" : "off");
 735     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 736
 737     return 0;
 738 }
 739
 740 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val)
 741 {
 742     QemuOpt *opt;
 743     const QemuOptDesc *desc = opts->list->desc;
 744
 745     opt = g_malloc0(sizeof(*opt));
 746     opt->desc = find_desc_by_name(desc, name);
 747     if (!opt->desc && !opts_accepts_any(opts)) {
 748         qerror_report(QERR_INVALID_PARAMETER, name);
 749         g_free(opt);
 750         return -1;
 751     }
 752
 753     opt->name = g_strdup(name);
 754     opt->opts = opts;
 755     opt->value.uint = val;
 756     opt->str = g_strdup_printf("%" PRId64, val);
 757     QTAILQ_INSERT_TAIL(&opts->head, opt, next);
 758
 759     return 0;
 760 }
 761
 762 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 763                      int abort_on_failure)
 764 {
 765     QemuOpt *opt;
 766     int rc = 0;
 767
 768     QTAILQ_FOREACH(opt, &opts->head, next) {
 769         rc = func(opt->name, opt->str, opaque);
 770         if (abort_on_failure  &&  rc != 0)
 771             break;
 772     }
 773     return rc;
 774 }
 775
 776 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
 777 {
 778     QemuOpts *opts;
 779
 780     QTAILQ_FOREACH(opts, &list->head, next) {
 781         if (!opts->id && !id) {
 782             return opts;
 783         }
 784         if (opts->id && id && !strcmp(opts->id, id)) {
 785             return opts;
 786         }
 787     }
 788     return NULL;
 789 }
 790
 791 static int id_wellformed(const char *id)
 792 {
 793     int i;
 794
 795     if (!qemu_isalpha(id[0])) {
 796         return 0;
 797     }
 798     for (i = 1; id[i]; i++) {
 799         if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
 800             return 0;
 801         }
 802     }
 803     return 1;
 804 }
 805
 806 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 807                            int fail_if_exists, Error **errp)
 808 {
 809     QemuOpts *opts = NULL;
 810
 811     if (id) {
 812         if (!id_wellformed(id)) {
 813             error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
 814 #if 0 /* conversion from qerror_report() to error_set() broke this: */
 815             error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
 816 #endif
 817             return NULL;
 818         }
 819         opts = qemu_opts_find(list, id);
 820         if (opts != NULL) {
 821             if (fail_if_exists && !list->merge_lists) {
 822                 error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
 823                 return NULL;
 824             } else {
 825                 return opts;
 826             }
 827         }
 828     } else if (list->merge_lists) {
 829         opts = qemu_opts_find(list, NULL);
 830         if (opts) {
 831             return opts;
 832         }
 833     }
 834     opts = g_malloc0(sizeof(*opts));
 835     opts->id = g_strdup(id);
 836     opts->list = list;
 837     loc_save(&opts->loc);
 838     QTAILQ_INIT(&opts->head);
 839     QTAILQ_INSERT_TAIL(&list->head, opts, next);
 840     return opts;
 841 }
 842
 843 void qemu_opts_reset(QemuOptsList *list)
 844 {
 845     QemuOpts *opts, *next_opts;
 846
 847     QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
 848         qemu_opts_del(opts);
 849     }
 850 }
 851
 852 void qemu_opts_loc_restore(QemuOpts *opts)
 853 {
 854     loc_restore(&opts->loc);
 855 }
 856
 857 int qemu_opts_set(QemuOptsList *list, const char *id,
 858                   const char *name, const char *value)
 859 {
 860     QemuOpts *opts;
 861     Error *local_err = NULL;
 862
 863     opts = qemu_opts_create(list, id, 1, &local_err);
 864     if (local_err) {
 865         qerror_report_err(local_err);
 866         error_free(local_err);
 867         return -1;
 868     }
 869     return qemu_opt_set(opts, name, value);
 870 }
 871
 872 const char *qemu_opts_id(QemuOpts *opts)
 873 {
 874     return opts->id;
 875 }
 876
 877 /* The id string will be g_free()d by qemu_opts_del */
 878 void qemu_opts_set_id(QemuOpts *opts, char *id)
 879 {
 880     opts->id = id;
 881 }
 882
 883 void qemu_opts_del(QemuOpts *opts)
 884 {
 885     QemuOpt *opt;
 886
 887     for (;;) {
 888         opt = QTAILQ_FIRST(&opts->head);
 889         if (opt == NULL)
 890             break;
 891         qemu_opt_del(opt);
 892     }
 893     QTAILQ_REMOVE(&opts->list->head, opts, next);
 894     g_free(opts->id);
 895     g_free(opts);
 896 }
 897
 898 int qemu_opts_print(QemuOpts *opts, void *dummy)
 899 {
 900     QemuOpt *opt;
 901
 902     fprintf(stderr, "%s: %s:", opts->list->name,
 903             opts->id ? opts->id : "<noid>");
 904     QTAILQ_FOREACH(opt, &opts->head, next) {
 905         fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
 906     }
 907     fprintf(stderr, "\n");
 908     return 0;
 909 }
 910
 911 static int opts_do_parse(QemuOpts *opts, const char *params,
 912                          const char *firstname, bool prepend)
 913 {
 914     char option[128], value[1024];
 915     const char *p,*pe,*pc;
 916     Error *local_err = NULL;
 917
 918     for (p = params; *p != '\0'; p++) {
 919         pe = strchr(p, '=');
 920         pc = strchr(p, ',');
 921         if (!pe || (pc && pc < pe)) {
 922             /* found "foo,more" */
 923             if (p == params && firstname) {
 924                 /* implicitly named first option */
 925                 pstrcpy(option, sizeof(option), firstname);
 926                 p = get_opt_value(value, sizeof(value), p);
 927             } else {
 928                 /* option without value, probably a flag */
 929                 p = get_opt_name(option, sizeof(option), p, ',');
 930                 if (strncmp(option, "no", 2) == 0) {
 931                     memmove(option, option+2, strlen(option+2)+1);
 932                     pstrcpy(value, sizeof(value), "off");
 933                 } else {
 934                     pstrcpy(value, sizeof(value), "on");
 935                 }
 936             }
 937         } else {
 938             /* found "foo=bar,more" */
 939             p = get_opt_name(option, sizeof(option), p, '=');
 940             if (*p != '=') {
 941                 break;
 942             }
 943             p++;
 944             p = get_opt_value(value, sizeof(value), p);
 945         }
 946         if (strcmp(option, "id") != 0) {
 947             /* store and parse */
 948             opt_set(opts, option, value, prepend, &local_err);
 949             if (local_err) {
 950                 qerror_report_err(local_err);
 951                 error_free(local_err);
 952                 return -1;
 953             }
 954         }
 955         if (*p != ',') {
 956             break;
 957         }
 958     }
 959     return 0;
 960 }
 961
 962 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
 963 {
 964     return opts_do_parse(opts, params, firstname, false);
 965 }
 966
 967 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
 968                             int permit_abbrev, bool defaults)
 969 {
 970     const char *firstname;
 971     char value[1024], *id = NULL;
 972     const char *p;
 973     QemuOpts *opts;
 974     Error *local_err = NULL;
 975
 976     assert(!permit_abbrev || list->implied_opt_name);
 977     firstname = permit_abbrev ? list->implied_opt_name : NULL;
 978
 979     if (strncmp(params, "id=", 3) == 0) {
 980         get_opt_value(value, sizeof(value), params+3);
 981         id = value;
 982     } else if ((p = strstr(params, ",id=")) != NULL) {
 983         get_opt_value(value, sizeof(value), p+4);
 984         id = value;
 985     }
 986
 987     /*
 988      * This code doesn't work for defaults && !list->merge_lists: when
 989      * params has no id=, and list has an element with !opts->id, it
 990      * appends a new element instead of returning the existing opts.
 991      * However, we got no use for this case.  Guard against possible
 992      * (if unlikely) future misuse:
 993      */
 994     assert(!defaults || list->merge_lists);
 995     opts = qemu_opts_create(list, id, !defaults, &local_err);
 996     if (opts == NULL) {
 997         if (local_err) {
 998             qerror_report_err(local_err);
 999             error_free(local_err);
1000         }
1001         return NULL;
1002     }
1003
1004     if (opts_do_parse(opts, params, firstname, defaults) != 0) {
1005         qemu_opts_del(opts);
1006         return NULL;
1007     }
1008
1009     return opts;
1010 }
1011
1012 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
1013                           int permit_abbrev)
1014 {
1015     return opts_parse(list, params, permit_abbrev, false);
1016 }
1017
1018 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
1019                             int permit_abbrev)
1020 {
1021     QemuOpts *opts;
1022
1023     opts = opts_parse(list, params, permit_abbrev, true);
1024     assert(opts);
1025 }
1026
1027 typedef struct OptsFromQDictState {
1028     QemuOpts *opts;
1029     Error **errp;
1030 } OptsFromQDictState;
1031
1032 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
1033 {
1034     OptsFromQDictState *state = opaque;
1035     char buf[32];
1036     const char *value;
1037     int n;
1038
1039     if (!strcmp(key, "id") || error_is_set(state->errp)) {
1040         return;
1041     }
1042
1043     switch (qobject_type(obj)) {
1044     case QTYPE_QSTRING:
1045         value = qstring_get_str(qobject_to_qstring(obj));
1046         break;
1047     case QTYPE_QINT:
1048         n = snprintf(buf, sizeof(buf), "%" PRId64,
1049                      qint_get_int(qobject_to_qint(obj)));
1050         assert(n < sizeof(buf));
1051         value = buf;
1052         break;
1053     case QTYPE_QFLOAT:
1054         n = snprintf(buf, sizeof(buf), "%.17g",
1055                      qfloat_get_double(qobject_to_qfloat(obj)));
1056         assert(n < sizeof(buf));
1057         value = buf;
1058         break;
1059     case QTYPE_QBOOL:
1060         pstrcpy(buf, sizeof(buf),
1061                 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
1062         value = buf;
1063         break;
1064     default:
1065         return;
1066     }
1067
1068     qemu_opt_set_err(state->opts, key, value, state->errp);
1069 }
1070
1071 /*
1072  * Create QemuOpts from a QDict.
1073  * Use value of key "id" as ID if it exists and is a QString.
1074  * Only QStrings, QInts, QFloats and QBools are copied.  Entries with
1075  * other types are silently ignored.
1076  */
1077 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
1078                                Error **errp)
1079 {
1080     OptsFromQDictState state;
1081     Error *local_err = NULL;
1082     QemuOpts *opts;
1083
1084     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
1085                             &local_err);
1086     if (local_err) {
1087         error_propagate(errp, local_err);
1088         return NULL;
1089     }
1090
1091     assert(opts != NULL);
1092
1093     state.errp = &local_err;
1094     state.opts = opts;
1095     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
1096     if (local_err) {
1097         error_propagate(errp, local_err);
1098         qemu_opts_del(opts);
1099         return NULL;
1100     }
1101
1102     return opts;
1103 }
1104
1105 /*
1106  * Adds all QDict entries to the QemuOpts that can be added and removes them
1107  * from the QDict. When this function returns, the QDict contains only those
1108  * entries that couldn't be added to the QemuOpts.
1109  */
1110 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
1111 {
1112     const QDictEntry *entry, *next;
1113
1114     entry = qdict_first(qdict);
1115
1116     while (entry != NULL) {
1117         Error *local_err = NULL;
1118         OptsFromQDictState state = {
1119             .errp = &local_err,
1120             .opts = opts,
1121         };
1122
1123         next = qdict_next(qdict, entry);
1124
1125         if (find_desc_by_name(opts->list->desc, entry->key)) {
1126             qemu_opts_from_qdict_1(entry->key, entry->value, &state);
1127             if (local_err) {
1128                 error_propagate(errp, local_err);
1129                 return;
1130             } else {
1131                 qdict_del(qdict, entry->key);
1132             }
1133         }
1134
1135         entry = next;
1136     }
1137 }
1138
1139 /*
1140  * Convert from QemuOpts to QDict.
1141  * The QDict values are of type QString.
1142  * TODO We'll want to use types appropriate for opt->desc->type, but
1143  * this is enough for now.
1144  */
1145 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1146 {
1147     QemuOpt *opt;
1148     QObject *val;
1149
1150     if (!qdict) {
1151         qdict = qdict_new();
1152     }
1153     if (opts->id) {
1154         qdict_put(qdict, "id", qstring_from_str(opts->id));
1155     }
1156     QTAILQ_FOREACH(opt, &opts->head, next) {
1157         val = QOBJECT(qstring_from_str(opt->str));
1158         qdict_put_obj(qdict, opt->name, val);
1159     }
1160     return qdict;
1161 }
1162
1163 /* Validate parsed opts against descriptions where no
1164  * descriptions were provided in the QemuOptsList.
1165  */
1166 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1167 {
1168     QemuOpt *opt;
1169     Error *local_err = NULL;
1170
1171     assert(opts_accepts_any(opts));
1172
1173     QTAILQ_FOREACH(opt, &opts->head, next) {
1174         opt->desc = find_desc_by_name(desc, opt->name);
1175         if (!opt->desc) {
1176             error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1177             return;
1178         }
1179
1180         qemu_opt_parse(opt, &local_err);
1181         if (local_err) {
1182             error_propagate(errp, local_err);
1183             return;
1184         }
1185     }
1186 }
1187
1188 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1189                       int abort_on_failure)
1190 {
1191     Location loc;
1192     QemuOpts *opts;
1193     int rc = 0;
1194
1195     loc_push_none(&loc);
1196     QTAILQ_FOREACH(opts, &list->head, next) {
1197         loc_restore(&opts->loc);
1198         rc |= func(opts, opaque);
1199         if (abort_on_failure  &&  rc != 0)
1200             break;
1201     }
1202     loc_pop(&loc);
1203     return rc;
1204 }