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);
126 static void parse_option_bool(const char *name, const char *value, bool *ret,
130 if (!strcmp(value, "on")) {
132 } else if (!strcmp(value, "off")) {
135 error_set(errp,QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
142 static void parse_option_number(const char *name, const char *value,
143 uint64_t *ret, Error **errp)
149 number = strtoull(value, &postfix, 0);
150 if (*postfix != '\0') {
151 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
156 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
160 static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
165 for (i = 0; desc[i].name != NULL; i++) {
166 if (strcmp(desc[i].name, name) == 0) {
174 void parse_option_size(const char *name, const char *value,
175 uint64_t *ret, Error **errp)
181 sizef = strtod(value, &postfix);
198 *ret = (uint64_t) sizef;
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");
209 error_set(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
213 bool has_help_option(const char *param)
215 size_t buflen = strlen(param) + 1;
216 char *buf = g_malloc0(buflen);
217 const char *p = param;
221 p = get_opt_value(buf, buflen, p);
226 if (is_help_option(buf)) {
237 bool is_valid_option_list(const char *param)
239 size_t buflen = strlen(param) + 1;
240 char *buf = g_malloc0(buflen);
241 const char *p = param;
245 p = get_opt_value(buf, buflen, p);
251 if (!*buf || *buf == ',') {
262 void qemu_opts_print_help(QemuOptsList *list)
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");
275 /* ------------------------------------------------------------------ */
277 QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
281 QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
282 if (strcmp(opt->name, name) != 0)
289 static void qemu_opt_del(QemuOpt *opt)
291 QTAILQ_REMOVE(&opt->opts->head, opt, next);
297 /* qemu_opt_set allows many settings for the same option.
298 * This function deletes all settings for an option.
300 static void qemu_opt_del_all(QemuOpts *opts, const char *name)
302 QemuOpt *opt, *next_opt;
304 QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next_opt) {
305 if (!strcmp(opt->name, name)) {
311 const char *qemu_opt_get(QemuOpts *opts, const char *name)
319 opt = qemu_opt_find(opts, name);
321 const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
322 if (desc && desc->def_value_str) {
323 return desc->def_value_str;
326 return opt ? opt->str : NULL;
329 /* Get a known option (or its default) and remove it from the list
330 * all in one action. Return a malloced string of the option value.
331 * Result must be freed by caller with g_free().
333 char *qemu_opt_get_del(QemuOpts *opts, const char *name)
336 const QemuOptDesc *desc;
343 opt = qemu_opt_find(opts, name);
345 desc = find_desc_by_name(opts->list->desc, name);
346 if (desc && desc->def_value_str) {
347 str = g_strdup(desc->def_value_str);
353 qemu_opt_del_all(opts, name);
357 bool qemu_opt_has_help_opt(QemuOpts *opts)
361 QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
362 if (is_help_option(opt->name)) {
369 static bool qemu_opt_get_bool_helper(QemuOpts *opts, const char *name,
370 bool defval, bool del)
379 opt = qemu_opt_find(opts, name);
381 const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
382 if (desc && desc->def_value_str) {
383 parse_option_bool(name, desc->def_value_str, &ret, &error_abort);
387 assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
388 ret = opt->value.boolean;
390 qemu_opt_del_all(opts, name);
395 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
397 return qemu_opt_get_bool_helper(opts, name, defval, false);
400 bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval)
402 return qemu_opt_get_bool_helper(opts, name, defval, true);
405 static uint64_t qemu_opt_get_number_helper(QemuOpts *opts, const char *name,
406 uint64_t defval, bool del)
409 uint64_t ret = defval;
415 opt = qemu_opt_find(opts, name);
417 const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
418 if (desc && desc->def_value_str) {
419 parse_option_number(name, desc->def_value_str, &ret, &error_abort);
423 assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
424 ret = opt->value.uint;
426 qemu_opt_del_all(opts, name);
431 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
433 return qemu_opt_get_number_helper(opts, name, defval, false);
436 uint64_t qemu_opt_get_number_del(QemuOpts *opts, const char *name,
439 return qemu_opt_get_number_helper(opts, name, defval, true);
442 static uint64_t qemu_opt_get_size_helper(QemuOpts *opts, const char *name,
443 uint64_t defval, bool del)
446 uint64_t ret = defval;
452 opt = qemu_opt_find(opts, name);
454 const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
455 if (desc && desc->def_value_str) {
456 parse_option_size(name, desc->def_value_str, &ret, &error_abort);
460 assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
461 ret = opt->value.uint;
463 qemu_opt_del_all(opts, name);
468 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
470 return qemu_opt_get_size_helper(opts, name, defval, false);
473 uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name,
476 return qemu_opt_get_size_helper(opts, name, defval, true);
479 static void qemu_opt_parse(QemuOpt *opt, Error **errp)
481 if (opt->desc == NULL)
484 switch (opt->desc->type) {
485 case QEMU_OPT_STRING:
489 parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
491 case QEMU_OPT_NUMBER:
492 parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
495 parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
502 static bool opts_accepts_any(const QemuOpts *opts)
504 return opts->list->desc[0].name == NULL;
507 int qemu_opt_unset(QemuOpts *opts, const char *name)
509 QemuOpt *opt = qemu_opt_find(opts, name);
511 assert(opts_accepts_any(opts));
521 static void opt_set(QemuOpts *opts, const char *name, const char *value,
522 bool prepend, Error **errp)
525 const QemuOptDesc *desc;
526 Error *local_err = NULL;
528 desc = find_desc_by_name(opts->list->desc, name);
529 if (!desc && !opts_accepts_any(opts)) {
530 error_set(errp, QERR_INVALID_PARAMETER, name);
534 opt = g_malloc0(sizeof(*opt));
535 opt->name = g_strdup(name);
538 QTAILQ_INSERT_HEAD(&opts->head, opt, next);
540 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
543 opt->str = g_strdup(value);
544 qemu_opt_parse(opt, &local_err);
546 error_propagate(errp, local_err);
551 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
553 Error *local_err = NULL;
555 opt_set(opts, name, value, false, &local_err);
557 qerror_report_err(local_err);
558 error_free(local_err);
565 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
568 opt_set(opts, name, value, false, errp);
571 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
574 const QemuOptDesc *desc = opts->list->desc;
576 opt = g_malloc0(sizeof(*opt));
577 opt->desc = find_desc_by_name(desc, name);
578 if (!opt->desc && !opts_accepts_any(opts)) {
579 qerror_report(QERR_INVALID_PARAMETER, name);
584 opt->name = g_strdup(name);
586 opt->value.boolean = !!val;
587 opt->str = g_strdup(val ? "on" : "off");
588 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
593 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val)
596 const QemuOptDesc *desc = opts->list->desc;
598 opt = g_malloc0(sizeof(*opt));
599 opt->desc = find_desc_by_name(desc, name);
600 if (!opt->desc && !opts_accepts_any(opts)) {
601 qerror_report(QERR_INVALID_PARAMETER, name);
606 opt->name = g_strdup(name);
608 opt->value.uint = val;
609 opt->str = g_strdup_printf("%" PRId64, val);
610 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
615 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
616 int abort_on_failure)
621 QTAILQ_FOREACH(opt, &opts->head, next) {
622 rc = func(opt->name, opt->str, opaque);
623 if (abort_on_failure && rc != 0)
629 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
633 QTAILQ_FOREACH(opts, &list->head, next) {
634 if (!opts->id && !id) {
637 if (opts->id && id && !strcmp(opts->id, id)) {
644 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
645 int fail_if_exists, Error **errp)
647 QemuOpts *opts = NULL;
650 if (!id_wellformed(id)) {
651 error_set(errp,QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
652 #if 0 /* conversion from qerror_report() to error_set() broke this: */
653 error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
657 opts = qemu_opts_find(list, id);
659 if (fail_if_exists && !list->merge_lists) {
660 error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
666 } else if (list->merge_lists) {
667 opts = qemu_opts_find(list, NULL);
672 opts = g_malloc0(sizeof(*opts));
673 opts->id = g_strdup(id);
675 loc_save(&opts->loc);
676 QTAILQ_INIT(&opts->head);
677 QTAILQ_INSERT_TAIL(&list->head, opts, next);
681 void qemu_opts_reset(QemuOptsList *list)
683 QemuOpts *opts, *next_opts;
685 QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
690 void qemu_opts_loc_restore(QemuOpts *opts)
692 loc_restore(&opts->loc);
695 int qemu_opts_set(QemuOptsList *list, const char *id,
696 const char *name, const char *value)
699 Error *local_err = NULL;
701 opts = qemu_opts_create(list, id, 1, &local_err);
703 qerror_report_err(local_err);
704 error_free(local_err);
707 return qemu_opt_set(opts, name, value);
710 const char *qemu_opts_id(QemuOpts *opts)
715 /* The id string will be g_free()d by qemu_opts_del */
716 void qemu_opts_set_id(QemuOpts *opts, char *id)
721 void qemu_opts_del(QemuOpts *opts)
730 opt = QTAILQ_FIRST(&opts->head);
735 QTAILQ_REMOVE(&opts->list->head, opts, next);
740 void qemu_opts_print(QemuOpts *opts, const char *sep)
743 QemuOptDesc *desc = opts->list->desc;
745 if (desc[0].name == NULL) {
746 QTAILQ_FOREACH(opt, &opts->head, next) {
747 printf("%s%s=\"%s\"", sep, opt->name, opt->str);
751 for (; desc && desc->name; desc++) {
753 QemuOpt *opt = qemu_opt_find(opts, desc->name);
755 value = opt ? opt->str : desc->def_value_str;
759 if (desc->type == QEMU_OPT_STRING) {
760 printf("%s%s='%s'", sep, desc->name, value);
761 } else if ((desc->type == QEMU_OPT_SIZE ||
762 desc->type == QEMU_OPT_NUMBER) && opt) {
763 printf("%s%s=%" PRId64, sep, desc->name, opt->value.uint);
765 printf("%s%s=%s", sep, desc->name, value);
770 static int opts_do_parse(QemuOpts *opts, const char *params,
771 const char *firstname, bool prepend)
773 char option[128], value[1024];
774 const char *p,*pe,*pc;
775 Error *local_err = NULL;
777 for (p = params; *p != '\0'; p++) {
780 if (!pe || (pc && pc < pe)) {
781 /* found "foo,more" */
782 if (p == params && firstname) {
783 /* implicitly named first option */
784 pstrcpy(option, sizeof(option), firstname);
785 p = get_opt_value(value, sizeof(value), p);
787 /* option without value, probably a flag */
788 p = get_opt_name(option, sizeof(option), p, ',');
789 if (strncmp(option, "no", 2) == 0) {
790 memmove(option, option+2, strlen(option+2)+1);
791 pstrcpy(value, sizeof(value), "off");
793 pstrcpy(value, sizeof(value), "on");
797 /* found "foo=bar,more" */
798 p = get_opt_name(option, sizeof(option), p, '=');
803 p = get_opt_value(value, sizeof(value), p);
805 if (strcmp(option, "id") != 0) {
806 /* store and parse */
807 opt_set(opts, option, value, prepend, &local_err);
809 qerror_report_err(local_err);
810 error_free(local_err);
821 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
823 return opts_do_parse(opts, params, firstname, false);
826 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
827 int permit_abbrev, bool defaults)
829 const char *firstname;
830 char value[1024], *id = NULL;
833 Error *local_err = NULL;
835 assert(!permit_abbrev || list->implied_opt_name);
836 firstname = permit_abbrev ? list->implied_opt_name : NULL;
838 if (strncmp(params, "id=", 3) == 0) {
839 get_opt_value(value, sizeof(value), params+3);
841 } else if ((p = strstr(params, ",id=")) != NULL) {
842 get_opt_value(value, sizeof(value), p+4);
847 * This code doesn't work for defaults && !list->merge_lists: when
848 * params has no id=, and list has an element with !opts->id, it
849 * appends a new element instead of returning the existing opts.
850 * However, we got no use for this case. Guard against possible
851 * (if unlikely) future misuse:
853 assert(!defaults || list->merge_lists);
854 opts = qemu_opts_create(list, id, !defaults, &local_err);
857 qerror_report_err(local_err);
858 error_free(local_err);
863 if (opts_do_parse(opts, params, firstname, defaults) != 0) {
871 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
874 return opts_parse(list, params, permit_abbrev, false);
877 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
882 opts = opts_parse(list, params, permit_abbrev, true);
886 typedef struct OptsFromQDictState {
889 } OptsFromQDictState;
891 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
893 OptsFromQDictState *state = opaque;
898 if (!strcmp(key, "id") || *state->errp) {
902 switch (qobject_type(obj)) {
904 value = qstring_get_str(qobject_to_qstring(obj));
907 n = snprintf(buf, sizeof(buf), "%" PRId64,
908 qint_get_int(qobject_to_qint(obj)));
909 assert(n < sizeof(buf));
913 n = snprintf(buf, sizeof(buf), "%.17g",
914 qfloat_get_double(qobject_to_qfloat(obj)));
915 assert(n < sizeof(buf));
919 pstrcpy(buf, sizeof(buf),
920 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
927 qemu_opt_set_err(state->opts, key, value, state->errp);
931 * Create QemuOpts from a QDict.
932 * Use value of key "id" as ID if it exists and is a QString.
933 * Only QStrings, QInts, QFloats and QBools are copied. Entries with
934 * other types are silently ignored.
936 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
939 OptsFromQDictState state;
940 Error *local_err = NULL;
943 opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
946 error_propagate(errp, local_err);
950 assert(opts != NULL);
952 state.errp = &local_err;
954 qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
956 error_propagate(errp, local_err);
965 * Adds all QDict entries to the QemuOpts that can be added and removes them
966 * from the QDict. When this function returns, the QDict contains only those
967 * entries that couldn't be added to the QemuOpts.
969 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
971 const QDictEntry *entry, *next;
973 entry = qdict_first(qdict);
975 while (entry != NULL) {
976 Error *local_err = NULL;
977 OptsFromQDictState state = {
982 next = qdict_next(qdict, entry);
984 if (find_desc_by_name(opts->list->desc, entry->key)) {
985 qemu_opts_from_qdict_1(entry->key, entry->value, &state);
987 error_propagate(errp, local_err);
990 qdict_del(qdict, entry->key);
999 * Convert from QemuOpts to QDict.
1000 * The QDict values are of type QString.
1001 * TODO We'll want to use types appropriate for opt->desc->type, but
1002 * this is enough for now.
1004 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1010 qdict = qdict_new();
1013 qdict_put(qdict, "id", qstring_from_str(opts->id));
1015 QTAILQ_FOREACH(opt, &opts->head, next) {
1016 val = QOBJECT(qstring_from_str(opt->str));
1017 qdict_put_obj(qdict, opt->name, val);
1022 /* Validate parsed opts against descriptions where no
1023 * descriptions were provided in the QemuOptsList.
1025 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
1028 Error *local_err = NULL;
1030 assert(opts_accepts_any(opts));
1032 QTAILQ_FOREACH(opt, &opts->head, next) {
1033 opt->desc = find_desc_by_name(desc, opt->name);
1035 error_set(errp, QERR_INVALID_PARAMETER, opt->name);
1039 qemu_opt_parse(opt, &local_err);
1041 error_propagate(errp, local_err);
1047 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1048 int abort_on_failure)
1054 loc_push_none(&loc);
1055 QTAILQ_FOREACH(opts, &list->head, next) {
1056 loc_restore(&opts->loc);
1057 rc |= func(opts, opaque);
1058 if (abort_on_failure && rc != 0)
1065 static size_t count_opts_list(QemuOptsList *list)
1067 QemuOptDesc *desc = NULL;
1068 size_t num_opts = 0;
1075 while (desc && desc->name) {
1083 void qemu_opts_free(QemuOptsList *list)
1088 /* Realloc dst option list and append options from an option list (list)
1089 * to it. dst could be NULL or a malloced list.
1090 * The lifetime of dst must be shorter than the input list because the
1091 * QemuOptDesc->name, ->help, and ->def_value_str strings are shared.
1093 QemuOptsList *qemu_opts_append(QemuOptsList *dst,
1096 size_t num_opts, num_dst_opts;
1098 bool need_init = false;
1099 bool need_head_update;
1105 /* If dst is NULL, after realloc, some area of dst should be initialized
1106 * before adding options to it.
1110 need_head_update = true;
1112 /* Moreover, even if dst is not NULL, the realloc may move it to a
1113 * different address in which case we may get a stale tail pointer
1115 need_head_update = QTAILQ_EMPTY(&dst->head);
1118 num_opts = count_opts_list(dst);
1119 num_dst_opts = num_opts;
1120 num_opts += count_opts_list(list);
1121 dst = g_realloc(dst, sizeof(QemuOptsList) +
1122 (num_opts + 1) * sizeof(QemuOptDesc));
1125 dst->implied_opt_name = NULL;
1126 dst->merge_lists = false;
1128 if (need_head_update) {
1129 QTAILQ_INIT(&dst->head);
1131 dst->desc[num_dst_opts].name = NULL;
1133 /* append list->desc to dst->desc */
1136 while (desc && desc->name) {
1137 if (find_desc_by_name(dst->desc, desc->name) == NULL) {
1138 dst->desc[num_dst_opts++] = *desc;
1139 dst->desc[num_dst_opts].name = NULL;