2 * Commandline option parsing functions
4 * Copyright (c) 2003-2008 Fabrice Bellard
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8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
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29 #include "qemu-common.h"
30 #include "qemu-error.h"
31 #include "qemu-objects.h"
34 #include "qemu-option-internal.h"
37 * Extracts the name of an option from the parameter string (p points at the
38 * first byte of the option name)
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.
44 * The return value is the position of the delimiter/zero byte after the option
47 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim)
52 while (*p != '\0' && *p != delim) {
53 if (q && (q - buf) < buf_size - 1)
64 * Extracts the value of an option from the parameter string p (p points at the
65 * first byte of the option value)
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.
71 const char *get_opt_value(char *buf, int buf_size, const char *p)
82 if (q && (q - buf) < buf_size - 1)
92 int get_next_param_value(char *buf, int buf_size,
93 const char *tag, const char **pstr)
100 p = get_opt_name(option, sizeof(option), p, '=');
104 if (!strcmp(tag, option)) {
105 *pstr = get_opt_value(buf, buf_size, p);
111 p = get_opt_value(NULL, 0, p);
120 int get_param_value(char *buf, int buf_size,
121 const char *tag, const char *str)
123 return get_next_param_value(buf, buf_size, tag, &str);
126 int check_params(char *buf, int buf_size,
127 const char * const *params, const char *str)
134 p = get_opt_name(buf, buf_size, p, '=');
139 for (i = 0; params[i] != NULL; i++) {
140 if (!strcmp(params[i], buf)) {
144 if (params[i] == NULL) {
147 p = get_opt_value(NULL, 0, p);
157 * Searches an option list for an option with the given name
159 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
162 while (list && list->name) {
163 if (!strcmp(list->name, name)) {
172 static void parse_option_bool(const char *name, const char *value, bool *ret,
176 if (!strcmp(value, "on")) {
178 } else if (!strcmp(value, "off")) {
181 error_set(errp,QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
188 static void parse_option_number(const char *name, const char *value,
189 uint64_t *ret, Error **errp)
195 number = strtoull(value, &postfix, 0);
196 if (*postfix != '\0') {
197 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
202 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
206 static void parse_option_size(const char *name, const char *value,
207 uint64_t *ret, Error **errp)
213 sizef = strtod(value, &postfix);
230 *ret = (uint64_t) sizef;
233 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
234 error_printf_unless_qmp("You may use k, M, G or T suffixes for "
235 "kilobytes, megabytes, gigabytes and terabytes.\n");
239 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
244 * Sets the value of a parameter in a given option list. The parsing of the
245 * value depends on the type of option:
247 * OPT_FLAG (uses value.n):
248 * If no value is given, the flag is set to 1.
249 * Otherwise the value must be "on" (set to 1) or "off" (set to 0)
251 * OPT_STRING (uses value.s):
252 * value is strdup()ed and assigned as option value
254 * OPT_SIZE (uses value.n):
255 * The value is converted to an integer. Suffixes for kilobytes etc. are
256 * allowed (powers of 1024).
258 * Returns 0 on succes, -1 in error cases
260 int set_option_parameter(QEMUOptionParameter *list, const char *name,
264 Error *local_err = NULL;
266 // Find a matching parameter
267 list = get_option_parameter(list, name);
269 fprintf(stderr, "Unknown option '%s'\n", name);
274 switch (list->type) {
276 parse_option_bool(name, value, &flag, &local_err);
277 if (!error_is_set(&local_err)) {
278 list->value.n = flag;
284 list->value.s = g_strdup(value);
286 fprintf(stderr, "Option '%s' needs a parameter\n", name);
292 parse_option_size(name, value, &list->value.n, &local_err);
296 fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
300 if (error_is_set(&local_err)) {
301 qerror_report_err(local_err);
302 error_free(local_err);
310 * Sets the given parameter to an integer instead of a string.
311 * This function cannot be used to set string options.
313 * Returns 0 on success, -1 in error cases
315 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
318 // Find a matching parameter
319 list = get_option_parameter(list, name);
321 fprintf(stderr, "Unknown option '%s'\n", name);
326 switch (list->type) {
330 list->value.n = value;
341 * Frees a option list. If it contains strings, the strings are freed as well.
343 void free_option_parameters(QEMUOptionParameter *list)
345 QEMUOptionParameter *cur = list;
347 while (cur && cur->name) {
348 if (cur->type == OPT_STRING) {
349 g_free(cur->value.s);
358 * Count valid options in list
360 static size_t count_option_parameters(QEMUOptionParameter *list)
362 size_t num_options = 0;
364 while (list && list->name) {
373 * Append an option list (list) to an option list (dest).
375 * If dest is NULL, a new copy of list is created.
377 * Returns a pointer to the first element of dest (or the newly allocated copy)
379 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
380 QEMUOptionParameter *list)
382 size_t num_options, num_dest_options;
384 num_options = count_option_parameters(dest);
385 num_dest_options = num_options;
387 num_options += count_option_parameters(list);
389 dest = g_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
390 dest[num_dest_options].name = NULL;
392 while (list && list->name) {
393 if (get_option_parameter(dest, list->name) == NULL) {
394 dest[num_dest_options++] = *list;
395 dest[num_dest_options].name = NULL;
404 * Parses a parameter string (param) into an option list (dest).
406 * list is the template option list. If dest is NULL, a new copy of list is
407 * created. If list is NULL, this function fails.
409 * A parameter string consists of one or more parameters, separated by commas.
410 * Each parameter consists of its name and possibly of a value. In the latter
411 * case, the value is delimited by an = character. To specify a value which
412 * contains commas, double each comma so it won't be recognized as the end of
415 * For more details of the parsing see above.
417 * Returns a pointer to the first element of dest (or the newly allocated copy)
418 * or NULL in error cases
420 QEMUOptionParameter *parse_option_parameters(const char *param,
421 QEMUOptionParameter *list, QEMUOptionParameter *dest)
423 QEMUOptionParameter *allocated = NULL;
426 char *param_delim, *value_delim;
434 dest = allocated = append_option_parameters(NULL, list);
439 // Find parameter name and value in the string
440 param_delim = strchr(param, ',');
441 value_delim = strchr(param, '=');
443 if (value_delim && (value_delim < param_delim || !param_delim)) {
450 param = get_opt_name(name, sizeof(name), param, next_delim);
452 param = get_opt_value(value, sizeof(value), param + 1);
454 if (*param != '\0') {
459 if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
467 // Only free the list if it was newly allocated
468 free_option_parameters(allocated);
473 * Prints all options of a list that have a value to stdout
475 void print_option_parameters(QEMUOptionParameter *list)
477 while (list && list->name) {
478 switch (list->type) {
480 if (list->value.s != NULL) {
481 printf("%s='%s' ", list->name, list->value.s);
485 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
489 printf("%s=%" PRId64 " ", list->name, list->value.n);
492 printf("%s=(unknown type) ", list->name);
500 * Prints an overview of all available options
502 void print_option_help(QEMUOptionParameter *list)
504 printf("Supported options:\n");
505 while (list && list->name) {
506 printf("%-16s %s\n", list->name,
507 list->help ? list->help : "No description available");
512 /* ------------------------------------------------------------------ */
514 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
518 QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
519 if (strcmp(opt->name, name) != 0)
526 const char *qemu_opt_get(QemuOpts *opts, const char *name)
528 QemuOpt *opt = qemu_opt_find(opts, name);
529 return opt ? opt->str : NULL;
532 bool qemu_opt_has_help_opt(QemuOpts *opts)
536 QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
537 if (is_help_option(opt->name)) {
544 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
546 QemuOpt *opt = qemu_opt_find(opts, name);
550 assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
551 return opt->value.boolean;
554 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
556 QemuOpt *opt = qemu_opt_find(opts, name);
560 assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
561 return opt->value.uint;
564 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
566 QemuOpt *opt = qemu_opt_find(opts, name);
570 assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
571 return opt->value.uint;
574 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
576 if (opt->desc == NULL)
579 switch (opt->desc->type) {
580 case QEMU_OPT_STRING:
584 parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
586 case QEMU_OPT_NUMBER:
587 parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
590 parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
597 static void qemu_opt_del(QemuOpt *opt)
599 QTAILQ_REMOVE(&opt->opts->head, opt, next);
600 g_free((/* !const */ char*)opt->name);
601 g_free((/* !const */ char*)opt->str);
605 static void opt_set(QemuOpts *opts, const char *name, const char *value,
606 bool prepend, Error **errp)
609 const QemuOptDesc *desc = opts->list->desc;
610 Error *local_err = NULL;
613 for (i = 0; desc[i].name != NULL; i++) {
614 if (strcmp(desc[i].name, name) == 0) {
618 if (desc[i].name == NULL) {
620 /* empty list -> allow any */;
622 error_set(errp, QERR_INVALID_PARAMETER, name);
627 opt = g_malloc0(sizeof(*opt));
628 opt->name = g_strdup(name);
631 QTAILQ_INSERT_HEAD(&opts->head, opt, next);
633 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
635 if (desc[i].name != NULL) {
639 opt->str = g_strdup(value);
641 qemu_opt_parse(opt, &local_err);
642 if (error_is_set(&local_err)) {
643 error_propagate(errp, local_err);
648 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
650 Error *local_err = NULL;
652 opt_set(opts, name, value, false, &local_err);
653 if (error_is_set(&local_err)) {
654 qerror_report_err(local_err);
655 error_free(local_err);
662 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
665 opt_set(opts, name, value, false, errp);
668 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
671 const QemuOptDesc *desc = opts->list->desc;
674 for (i = 0; desc[i].name != NULL; i++) {
675 if (strcmp(desc[i].name, name) == 0) {
679 if (desc[i].name == NULL) {
681 /* empty list -> allow any */;
683 qerror_report(QERR_INVALID_PARAMETER, name);
688 opt = g_malloc0(sizeof(*opt));
689 opt->name = g_strdup(name);
691 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
692 if (desc[i].name != NULL) {
695 opt->value.boolean = !!val;
699 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
700 int abort_on_failure)
705 QTAILQ_FOREACH(opt, &opts->head, next) {
706 rc = func(opt->name, opt->str, opaque);
707 if (abort_on_failure && rc != 0)
713 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
717 QTAILQ_FOREACH(opts, &list->head, next) {
724 if (strcmp(opts->id, id) != 0) {
732 static int id_wellformed(const char *id)
736 if (!qemu_isalpha(id[0])) {
739 for (i = 1; id[i]; i++) {
740 if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
747 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
748 int fail_if_exists, Error **errp)
750 QemuOpts *opts = NULL;
753 if (!id_wellformed(id)) {
754 error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
755 error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
758 opts = qemu_opts_find(list, id);
760 if (fail_if_exists && !list->merge_lists) {
761 error_set(errp, QERR_DUPLICATE_ID, id, list->name);
767 } else if (list->merge_lists) {
768 opts = qemu_opts_find(list, NULL);
773 opts = g_malloc0(sizeof(*opts));
775 opts->id = g_strdup(id);
778 loc_save(&opts->loc);
779 QTAILQ_INIT(&opts->head);
780 QTAILQ_INSERT_TAIL(&list->head, opts, next);
784 void qemu_opts_reset(QemuOptsList *list)
786 QemuOpts *opts, *next_opts;
788 QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
793 void qemu_opts_loc_restore(QemuOpts *opts)
795 loc_restore(&opts->loc);
798 int qemu_opts_set(QemuOptsList *list, const char *id,
799 const char *name, const char *value)
802 Error *local_err = NULL;
804 opts = qemu_opts_create(list, id, 1, &local_err);
805 if (error_is_set(&local_err)) {
806 qerror_report_err(local_err);
807 error_free(local_err);
810 return qemu_opt_set(opts, name, value);
813 const char *qemu_opts_id(QemuOpts *opts)
818 void qemu_opts_del(QemuOpts *opts)
823 opt = QTAILQ_FIRST(&opts->head);
828 QTAILQ_REMOVE(&opts->list->head, opts, next);
833 int qemu_opts_print(QemuOpts *opts, void *dummy)
837 fprintf(stderr, "%s: %s:", opts->list->name,
838 opts->id ? opts->id : "<noid>");
839 QTAILQ_FOREACH(opt, &opts->head, next) {
840 fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
842 fprintf(stderr, "\n");
846 static int opts_do_parse(QemuOpts *opts, const char *params,
847 const char *firstname, bool prepend)
849 char option[128], value[1024];
850 const char *p,*pe,*pc;
851 Error *local_err = NULL;
853 for (p = params; *p != '\0'; p++) {
856 if (!pe || (pc && pc < pe)) {
857 /* found "foo,more" */
858 if (p == params && firstname) {
859 /* implicitly named first option */
860 pstrcpy(option, sizeof(option), firstname);
861 p = get_opt_value(value, sizeof(value), p);
863 /* option without value, probably a flag */
864 p = get_opt_name(option, sizeof(option), p, ',');
865 if (strncmp(option, "no", 2) == 0) {
866 memmove(option, option+2, strlen(option+2)+1);
867 pstrcpy(value, sizeof(value), "off");
869 pstrcpy(value, sizeof(value), "on");
873 /* found "foo=bar,more" */
874 p = get_opt_name(option, sizeof(option), p, '=');
879 p = get_opt_value(value, sizeof(value), p);
881 if (strcmp(option, "id") != 0) {
882 /* store and parse */
883 opt_set(opts, option, value, prepend, &local_err);
884 if (error_is_set(&local_err)) {
885 qerror_report_err(local_err);
886 error_free(local_err);
897 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
899 return opts_do_parse(opts, params, firstname, false);
902 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
903 int permit_abbrev, bool defaults)
905 const char *firstname;
906 char value[1024], *id = NULL;
909 Error *local_err = NULL;
911 assert(!permit_abbrev || list->implied_opt_name);
912 firstname = permit_abbrev ? list->implied_opt_name : NULL;
914 if (strncmp(params, "id=", 3) == 0) {
915 get_opt_value(value, sizeof(value), params+3);
917 } else if ((p = strstr(params, ",id=")) != NULL) {
918 get_opt_value(value, sizeof(value), p+4);
922 if (!id && !QTAILQ_EMPTY(&list->head)) {
923 opts = qemu_opts_find(list, NULL);
925 opts = qemu_opts_create(list, id, 0, &local_err);
928 opts = qemu_opts_create(list, id, 1, &local_err);
931 if (error_is_set(&local_err)) {
932 qerror_report_err(local_err);
933 error_free(local_err);
938 if (opts_do_parse(opts, params, firstname, defaults) != 0) {
946 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
949 return opts_parse(list, params, permit_abbrev, false);
952 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
957 opts = opts_parse(list, params, permit_abbrev, true);
961 typedef struct OptsFromQDictState {
964 } OptsFromQDictState;
966 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
968 OptsFromQDictState *state = opaque;
973 if (!strcmp(key, "id") || error_is_set(state->errp)) {
977 switch (qobject_type(obj)) {
979 value = qstring_get_str(qobject_to_qstring(obj));
982 n = snprintf(buf, sizeof(buf), "%" PRId64,
983 qint_get_int(qobject_to_qint(obj)));
984 assert(n < sizeof(buf));
988 n = snprintf(buf, sizeof(buf), "%.17g",
989 qfloat_get_double(qobject_to_qfloat(obj)));
990 assert(n < sizeof(buf));
994 pstrcpy(buf, sizeof(buf),
995 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
1002 qemu_opt_set_err(state->opts, key, value, state->errp);
1006 * Create QemuOpts from a QDict.
1007 * Use value of key "id" as ID if it exists and is a QString.
1008 * Only QStrings, QInts, QFloats and QBools are copied. Entries with
1009 * other types are silently ignored.
1011 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
1014 OptsFromQDictState state;
1015 Error *local_err = NULL;
1018 opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
1020 if (error_is_set(&local_err)) {
1021 error_propagate(errp, local_err);
1025 assert(opts != NULL);
1027 state.errp = &local_err;
1029 qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
1030 if (error_is_set(&local_err)) {
1031 error_propagate(errp, local_err);
1032 qemu_opts_del(opts);
1040 * Convert from QemuOpts to QDict.
1041 * The QDict values are of type QString.
1042 * TODO We'll want to use types appropriate for opt->desc->type, but
1043 * this is enough for now.
1045 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1051 qdict = qdict_new();
1054 qdict_put(qdict, "id", qstring_from_str(opts->id));
1056 QTAILQ_FOREACH(opt, &opts->head, next) {
1057 val = QOBJECT(qstring_from_str(opt->str));
1058 qdict_put_obj(qdict, opt->name, val);
1063 /* Validate parsed opts against descriptions where no
1064 * descriptions were provided in the QemuOptsList.
1066 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1069 Error *local_err = NULL;
1071 assert(opts->list->desc[0].name == NULL);
1073 QTAILQ_FOREACH(opt, &opts->head, next) {
1076 for (i = 0; desc[i].name != NULL; i++) {
1077 if (strcmp(desc[i].name, opt->name) == 0) {
1081 if (desc[i].name == NULL) {
1082 error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1086 opt->desc = &desc[i];
1088 qemu_opt_parse(opt, &local_err);
1089 if (error_is_set(&local_err)) {
1090 error_propagate(errp, local_err);
1096 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1097 int abort_on_failure)
1103 loc_push_none(&loc);
1104 QTAILQ_FOREACH(opts, &list->head, next) {
1105 loc_restore(&opts->loc);
1106 rc |= func(opts, opaque);
1107 if (abort_on_failure && rc != 0)