2 * Commandline option parsing functions
4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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
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"
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);
127 * Searches an option list for an option with the given name
129 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
132 while (list && list->name) {
133 if (!strcmp(list->name, name)) {
142 static void parse_option_bool(const char *name, const char *value, bool *ret,
146 if (!strcmp(value, "on")) {
148 } else if (!strcmp(value, "off")) {
151 error_set(errp,QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
158 static void parse_option_number(const char *name, const char *value,
159 uint64_t *ret, Error **errp)
165 number = strtoull(value, &postfix, 0);
166 if (*postfix != '\0') {
167 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
172 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
176 void parse_option_size(const char *name, const char *value,
177 uint64_t *ret, Error **errp)
183 sizef = strtod(value, &postfix);
200 *ret = (uint64_t) sizef;
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");
211 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
216 * Sets the value of a parameter in a given option list. The parsing of the
217 * value depends on the type of option:
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)
223 * OPT_STRING (uses value.s):
224 * value is strdup()ed and assigned as option value
226 * OPT_SIZE (uses value.n):
227 * The value is converted to an integer. Suffixes for kilobytes etc. are
228 * allowed (powers of 1024).
230 * Returns 0 on succes, -1 in error cases
232 int set_option_parameter(QEMUOptionParameter *list, const char *name,
236 Error *local_err = NULL;
238 // Find a matching parameter
239 list = get_option_parameter(list, name);
241 fprintf(stderr, "Unknown option '%s'\n", name);
246 switch (list->type) {
248 parse_option_bool(name, value, &flag, &local_err);
249 if (!error_is_set(&local_err)) {
250 list->value.n = flag;
256 list->value.s = g_strdup(value);
258 fprintf(stderr, "Option '%s' needs a parameter\n", name);
264 parse_option_size(name, value, &list->value.n, &local_err);
268 fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
272 if (error_is_set(&local_err)) {
273 qerror_report_err(local_err);
274 error_free(local_err);
278 list->assigned = true;
284 * Sets the given parameter to an integer instead of a string.
285 * This function cannot be used to set string options.
287 * Returns 0 on success, -1 in error cases
289 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
292 // Find a matching parameter
293 list = get_option_parameter(list, name);
295 fprintf(stderr, "Unknown option '%s'\n", name);
300 switch (list->type) {
304 list->value.n = value;
311 list->assigned = true;
317 * Frees a option list. If it contains strings, the strings are freed as well.
319 void free_option_parameters(QEMUOptionParameter *list)
321 QEMUOptionParameter *cur = list;
323 while (cur && cur->name) {
324 if (cur->type == OPT_STRING) {
325 g_free(cur->value.s);
334 * Count valid options in list
336 static size_t count_option_parameters(QEMUOptionParameter *list)
338 size_t num_options = 0;
340 while (list && list->name) {
349 * Append an option list (list) to an option list (dest).
351 * If dest is NULL, a new copy of list is created.
353 * Returns a pointer to the first element of dest (or the newly allocated copy)
355 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
356 QEMUOptionParameter *list)
358 size_t num_options, num_dest_options;
360 num_options = count_option_parameters(dest);
361 num_dest_options = num_options;
363 num_options += count_option_parameters(list);
365 dest = g_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
366 dest[num_dest_options].name = NULL;
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;
380 * Parses a parameter string (param) into an option list (dest).
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.
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
391 * For more details of the parsing see above.
393 * Returns a pointer to the first element of dest (or the newly allocated copy)
394 * or NULL in error cases
396 QEMUOptionParameter *parse_option_parameters(const char *param,
397 QEMUOptionParameter *list, QEMUOptionParameter *dest)
399 QEMUOptionParameter *allocated = NULL;
402 char *param_delim, *value_delim;
411 dest = allocated = append_option_parameters(NULL, list);
414 for (i = 0; dest[i].name; i++) {
415 dest[i].assigned = false;
420 // Find parameter name and value in the string
421 param_delim = strchr(param, ',');
422 value_delim = strchr(param, '=');
424 if (value_delim && (value_delim < param_delim || !param_delim)) {
431 param = get_opt_name(name, sizeof(name), param, next_delim);
433 param = get_opt_value(value, sizeof(value), param + 1);
435 if (*param != '\0') {
440 if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
448 // Only free the list if it was newly allocated
449 free_option_parameters(allocated);
454 * Prints all options of a list that have a value to stdout
456 void print_option_parameters(QEMUOptionParameter *list)
458 while (list && list->name) {
459 switch (list->type) {
461 if (list->value.s != NULL) {
462 printf("%s='%s' ", list->name, list->value.s);
466 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
470 printf("%s=%" PRId64 " ", list->name, list->value.n);
473 printf("%s=(unknown type) ", list->name);
481 * Prints an overview of all available options
483 void print_option_help(QEMUOptionParameter *list)
485 printf("Supported options:\n");
486 while (list && list->name) {
487 printf("%-16s %s\n", list->name,
488 list->help ? list->help : "No description available");
493 /* ------------------------------------------------------------------ */
495 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
499 QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
500 if (strcmp(opt->name, name) != 0)
507 const char *qemu_opt_get(QemuOpts *opts, const char *name)
509 QemuOpt *opt = qemu_opt_find(opts, name);
510 return opt ? opt->str : NULL;
513 bool qemu_opt_has_help_opt(QemuOpts *opts)
517 QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
518 if (is_help_option(opt->name)) {
525 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
527 QemuOpt *opt = qemu_opt_find(opts, name);
531 assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
532 return opt->value.boolean;
535 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
537 QemuOpt *opt = qemu_opt_find(opts, name);
541 assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
542 return opt->value.uint;
545 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
547 QemuOpt *opt = qemu_opt_find(opts, name);
551 assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
552 return opt->value.uint;
555 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
557 if (opt->desc == NULL)
560 switch (opt->desc->type) {
561 case QEMU_OPT_STRING:
565 parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
567 case QEMU_OPT_NUMBER:
568 parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
571 parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
578 static void qemu_opt_del(QemuOpt *opt)
580 QTAILQ_REMOVE(&opt->opts->head, opt, next);
581 g_free((/* !const */ char*)opt->name);
582 g_free((/* !const */ char*)opt->str);
586 static bool opts_accepts_any(const QemuOpts *opts)
588 return opts->list->desc[0].name == NULL;
591 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
596 for (i = 0; desc[i].name != NULL; i++) {
597 if (strcmp(desc[i].name, name) == 0) {
605 int qemu_opt_unset(QemuOpts *opts, const char *name)
607 QemuOpt *opt = qemu_opt_find(opts, name);
609 assert(opts_accepts_any(opts));
619 static void opt_set(QemuOpts *opts, const char *name, const char *value,
620 bool prepend, Error **errp)
623 const QemuOptDesc *desc;
624 Error *local_err = NULL;
626 desc = find_desc_by_name(opts->list->desc, name);
627 if (!desc && !opts_accepts_any(opts)) {
628 error_set(errp, QERR_INVALID_PARAMETER, name);
632 opt = g_malloc0(sizeof(*opt));
633 opt->name = g_strdup(name);
636 QTAILQ_INSERT_HEAD(&opts->head, opt, next);
638 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
641 opt->str = g_strdup(value);
642 qemu_opt_parse(opt, &local_err);
643 if (error_is_set(&local_err)) {
644 error_propagate(errp, local_err);
649 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
651 Error *local_err = NULL;
653 opt_set(opts, name, value, false, &local_err);
654 if (error_is_set(&local_err)) {
655 qerror_report_err(local_err);
656 error_free(local_err);
663 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
666 opt_set(opts, name, value, false, errp);
669 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
672 const QemuOptDesc *desc = opts->list->desc;
674 opt = g_malloc0(sizeof(*opt));
675 opt->desc = find_desc_by_name(desc, name);
676 if (!opt->desc && !opts_accepts_any(opts)) {
677 qerror_report(QERR_INVALID_PARAMETER, name);
682 opt->name = g_strdup(name);
684 opt->value.boolean = !!val;
685 opt->str = g_strdup(val ? "on" : "off");
686 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
691 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val)
694 const QemuOptDesc *desc = opts->list->desc;
696 opt = g_malloc0(sizeof(*opt));
697 opt->desc = find_desc_by_name(desc, name);
698 if (!opt->desc && !opts_accepts_any(opts)) {
699 qerror_report(QERR_INVALID_PARAMETER, name);
704 opt->name = g_strdup(name);
706 opt->value.uint = val;
707 opt->str = g_strdup_printf("%" PRId64, val);
708 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
713 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
714 int abort_on_failure)
719 QTAILQ_FOREACH(opt, &opts->head, next) {
720 rc = func(opt->name, opt->str, opaque);
721 if (abort_on_failure && rc != 0)
727 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
731 QTAILQ_FOREACH(opts, &list->head, next) {
732 if (!opts->id && !id) {
735 if (opts->id && id && !strcmp(opts->id, id)) {
742 static int id_wellformed(const char *id)
746 if (!qemu_isalpha(id[0])) {
749 for (i = 1; id[i]; i++) {
750 if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
757 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
758 int fail_if_exists, Error **errp)
760 QemuOpts *opts = NULL;
763 if (!id_wellformed(id)) {
764 error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
765 #if 0 /* conversion from qerror_report() to error_set() broke this: */
766 error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
770 opts = qemu_opts_find(list, id);
772 if (fail_if_exists && !list->merge_lists) {
773 error_set(errp, QERR_DUPLICATE_ID, id, list->name);
779 } else if (list->merge_lists) {
780 opts = qemu_opts_find(list, NULL);
785 opts = g_malloc0(sizeof(*opts));
786 opts->id = g_strdup(id);
788 loc_save(&opts->loc);
789 QTAILQ_INIT(&opts->head);
790 QTAILQ_INSERT_TAIL(&list->head, opts, next);
794 QemuOpts *qemu_opts_create_nofail(QemuOptsList *list)
798 opts = qemu_opts_create(list, NULL, 0, &errp);
799 assert_no_error(errp);
803 void qemu_opts_reset(QemuOptsList *list)
805 QemuOpts *opts, *next_opts;
807 QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
812 void qemu_opts_loc_restore(QemuOpts *opts)
814 loc_restore(&opts->loc);
817 int qemu_opts_set(QemuOptsList *list, const char *id,
818 const char *name, const char *value)
821 Error *local_err = NULL;
823 opts = qemu_opts_create(list, id, 1, &local_err);
824 if (error_is_set(&local_err)) {
825 qerror_report_err(local_err);
826 error_free(local_err);
829 return qemu_opt_set(opts, name, value);
832 const char *qemu_opts_id(QemuOpts *opts)
837 void qemu_opts_del(QemuOpts *opts)
842 opt = QTAILQ_FIRST(&opts->head);
847 QTAILQ_REMOVE(&opts->list->head, opts, next);
852 int qemu_opts_print(QemuOpts *opts, void *dummy)
856 fprintf(stderr, "%s: %s:", opts->list->name,
857 opts->id ? opts->id : "<noid>");
858 QTAILQ_FOREACH(opt, &opts->head, next) {
859 fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
861 fprintf(stderr, "\n");
865 static int opts_do_parse(QemuOpts *opts, const char *params,
866 const char *firstname, bool prepend)
868 char option[128], value[1024];
869 const char *p,*pe,*pc;
870 Error *local_err = NULL;
872 for (p = params; *p != '\0'; p++) {
875 if (!pe || (pc && pc < pe)) {
876 /* found "foo,more" */
877 if (p == params && firstname) {
878 /* implicitly named first option */
879 pstrcpy(option, sizeof(option), firstname);
880 p = get_opt_value(value, sizeof(value), p);
882 /* option without value, probably a flag */
883 p = get_opt_name(option, sizeof(option), p, ',');
884 if (strncmp(option, "no", 2) == 0) {
885 memmove(option, option+2, strlen(option+2)+1);
886 pstrcpy(value, sizeof(value), "off");
888 pstrcpy(value, sizeof(value), "on");
892 /* found "foo=bar,more" */
893 p = get_opt_name(option, sizeof(option), p, '=');
898 p = get_opt_value(value, sizeof(value), p);
900 if (strcmp(option, "id") != 0) {
901 /* store and parse */
902 opt_set(opts, option, value, prepend, &local_err);
903 if (error_is_set(&local_err)) {
904 qerror_report_err(local_err);
905 error_free(local_err);
916 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
918 return opts_do_parse(opts, params, firstname, false);
921 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
922 int permit_abbrev, bool defaults)
924 const char *firstname;
925 char value[1024], *id = NULL;
928 Error *local_err = NULL;
930 assert(!permit_abbrev || list->implied_opt_name);
931 firstname = permit_abbrev ? list->implied_opt_name : NULL;
933 if (strncmp(params, "id=", 3) == 0) {
934 get_opt_value(value, sizeof(value), params+3);
936 } else if ((p = strstr(params, ",id=")) != NULL) {
937 get_opt_value(value, sizeof(value), p+4);
942 * This code doesn't work for defaults && !list->merge_lists: when
943 * params has no id=, and list has an element with !opts->id, it
944 * appends a new element instead of returning the existing opts.
945 * However, we got no use for this case. Guard against possible
946 * (if unlikely) future misuse:
948 assert(!defaults || list->merge_lists);
949 opts = qemu_opts_create(list, id, !defaults, &local_err);
951 if (error_is_set(&local_err)) {
952 qerror_report_err(local_err);
953 error_free(local_err);
958 if (opts_do_parse(opts, params, firstname, defaults) != 0) {
966 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
969 return opts_parse(list, params, permit_abbrev, false);
972 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
977 opts = opts_parse(list, params, permit_abbrev, true);
981 typedef struct OptsFromQDictState {
984 } OptsFromQDictState;
986 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
988 OptsFromQDictState *state = opaque;
993 if (!strcmp(key, "id") || error_is_set(state->errp)) {
997 switch (qobject_type(obj)) {
999 value = qstring_get_str(qobject_to_qstring(obj));
1002 n = snprintf(buf, sizeof(buf), "%" PRId64,
1003 qint_get_int(qobject_to_qint(obj)));
1004 assert(n < sizeof(buf));
1008 n = snprintf(buf, sizeof(buf), "%.17g",
1009 qfloat_get_double(qobject_to_qfloat(obj)));
1010 assert(n < sizeof(buf));
1014 pstrcpy(buf, sizeof(buf),
1015 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
1022 qemu_opt_set_err(state->opts, key, value, state->errp);
1026 * Create QemuOpts from a QDict.
1027 * Use value of key "id" as ID if it exists and is a QString.
1028 * Only QStrings, QInts, QFloats and QBools are copied. Entries with
1029 * other types are silently ignored.
1031 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
1034 OptsFromQDictState state;
1035 Error *local_err = NULL;
1038 opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
1040 if (error_is_set(&local_err)) {
1041 error_propagate(errp, local_err);
1045 assert(opts != NULL);
1047 state.errp = &local_err;
1049 qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
1050 if (error_is_set(&local_err)) {
1051 error_propagate(errp, local_err);
1052 qemu_opts_del(opts);
1060 * Adds all QDict entries to the QemuOpts that can be added and removes them
1061 * from the QDict. When this function returns, the QDict contains only those
1062 * entries that couldn't be added to the QemuOpts.
1064 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
1066 const QDictEntry *entry, *next;
1068 entry = qdict_first(qdict);
1070 while (entry != NULL) {
1071 Error *local_err = NULL;
1072 OptsFromQDictState state = {
1077 next = qdict_next(qdict, entry);
1079 if (find_desc_by_name(opts->list->desc, entry->key)) {
1080 qemu_opts_from_qdict_1(entry->key, entry->value, &state);
1081 if (error_is_set(&local_err)) {
1082 error_propagate(errp, local_err);
1085 qdict_del(qdict, entry->key);
1094 * Convert from QemuOpts to QDict.
1095 * The QDict values are of type QString.
1096 * TODO We'll want to use types appropriate for opt->desc->type, but
1097 * this is enough for now.
1099 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1105 qdict = qdict_new();
1108 qdict_put(qdict, "id", qstring_from_str(opts->id));
1110 QTAILQ_FOREACH(opt, &opts->head, next) {
1111 val = QOBJECT(qstring_from_str(opt->str));
1112 qdict_put_obj(qdict, opt->name, val);
1117 /* Validate parsed opts against descriptions where no
1118 * descriptions were provided in the QemuOptsList.
1120 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1123 Error *local_err = NULL;
1125 assert(opts_accepts_any(opts));
1127 QTAILQ_FOREACH(opt, &opts->head, next) {
1128 opt->desc = find_desc_by_name(desc, opt->name);
1130 error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1134 qemu_opt_parse(opt, &local_err);
1135 if (error_is_set(&local_err)) {
1136 error_propagate(errp, local_err);
1142 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1143 int abort_on_failure)
1149 loc_push_none(&loc);
1150 QTAILQ_FOREACH(opts, &list->head, next) {
1151 loc_restore(&opts->loc);
1152 rc |= func(opts, opaque);
1153 if (abort_on_failure && rc != 0)