2 * Commandline option parsing functions
4 * Copyright (c) 2003-2008 Fabrice Bellard
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29 #include "qemu-common.h"
30 #include "qemu-error.h"
31 #include "qemu-objects.h"
32 #include "qemu-option.h"
36 * Extracts the name of an option from the parameter string (p points at the
37 * first byte of the option name)
39 * The option name is delimited by delim (usually , or =) or the string end
40 * and is copied into buf. If the option name is longer than buf_size, it is
41 * truncated. buf is always zero terminated.
43 * The return value is the position of the delimiter/zero byte after the option
46 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim)
51 while (*p != '\0' && *p != delim) {
52 if (q && (q - buf) < buf_size - 1)
63 * Extracts the value of an option from the parameter string p (p points at the
64 * first byte of the option value)
66 * This function is comparable to get_opt_name with the difference that the
67 * delimiter is fixed to be comma which starts a new option. To specify an
68 * option value that contains commas, double each comma.
70 const char *get_opt_value(char *buf, int buf_size, const char *p)
81 if (q && (q - buf) < buf_size - 1)
91 int get_next_param_value(char *buf, int buf_size,
92 const char *tag, const char **pstr)
99 p = get_opt_name(option, sizeof(option), p, '=');
103 if (!strcmp(tag, option)) {
104 *pstr = get_opt_value(buf, buf_size, p);
110 p = get_opt_value(NULL, 0, p);
119 int get_param_value(char *buf, int buf_size,
120 const char *tag, const char *str)
122 return get_next_param_value(buf, buf_size, tag, &str);
125 int check_params(char *buf, int buf_size,
126 const char * const *params, const char *str)
133 p = get_opt_name(buf, buf_size, p, '=');
138 for (i = 0; params[i] != NULL; i++) {
139 if (!strcmp(params[i], buf)) {
143 if (params[i] == NULL) {
146 p = get_opt_value(NULL, 0, p);
156 * Searches an option list for an option with the given name
158 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
161 while (list && list->name) {
162 if (!strcmp(list->name, name)) {
171 static int parse_option_bool(const char *name, const char *value, int *ret)
174 if (!strcmp(value, "on")) {
176 } else if (!strcmp(value, "off")) {
179 qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
188 static int parse_option_number(const char *name, const char *value, uint64_t *ret)
194 number = strtoull(value, &postfix, 0);
195 if (*postfix != '\0') {
196 qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a number");
201 qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a number");
207 static int parse_option_size(const char *name, const char *value, uint64_t *ret)
213 sizef = strtod(value, &postfix);
226 *ret = (uint64_t) sizef;
229 qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
230 error_printf_unless_qmp("You may use k, M, G or T suffixes for "
231 "kilobytes, megabytes, gigabytes and terabytes.\n");
235 qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
242 * Sets the value of a parameter in a given option list. The parsing of the
243 * value depends on the type of option:
245 * OPT_FLAG (uses value.n):
246 * If no value is given, the flag is set to 1.
247 * Otherwise the value must be "on" (set to 1) or "off" (set to 0)
249 * OPT_STRING (uses value.s):
250 * value is strdup()ed and assigned as option value
252 * OPT_SIZE (uses value.n):
253 * The value is converted to an integer. Suffixes for kilobytes etc. are
254 * allowed (powers of 1024).
256 * Returns 0 on succes, -1 in error cases
258 int set_option_parameter(QEMUOptionParameter *list, const char *name,
263 // Find a matching parameter
264 list = get_option_parameter(list, name);
266 fprintf(stderr, "Unknown option '%s'\n", name);
271 switch (list->type) {
273 if (parse_option_bool(name, value, &flag) == -1)
275 list->value.n = flag;
280 list->value.s = qemu_strdup(value);
282 fprintf(stderr, "Option '%s' needs a parameter\n", name);
288 if (parse_option_size(name, value, &list->value.n) == -1)
293 fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
301 * Sets the given parameter to an integer instead of a string.
302 * This function cannot be used to set string options.
304 * Returns 0 on success, -1 in error cases
306 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
309 // Find a matching parameter
310 list = get_option_parameter(list, name);
312 fprintf(stderr, "Unknown option '%s'\n", name);
317 switch (list->type) {
321 list->value.n = value;
332 * Frees a option list. If it contains strings, the strings are freed as well.
334 void free_option_parameters(QEMUOptionParameter *list)
336 QEMUOptionParameter *cur = list;
338 while (cur && cur->name) {
339 if (cur->type == OPT_STRING) {
340 qemu_free(cur->value.s);
349 * Count valid options in list
351 static size_t count_option_parameters(QEMUOptionParameter *list)
353 size_t num_options = 0;
355 while (list && list->name) {
364 * Append an option list (list) to an option list (dest).
366 * If dest is NULL, a new copy of list is created.
368 * Returns a pointer to the first element of dest (or the newly allocated copy)
370 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
371 QEMUOptionParameter *list)
373 size_t num_options, num_dest_options;
375 num_options = count_option_parameters(dest);
376 num_dest_options = num_options;
378 num_options += count_option_parameters(list);
380 dest = qemu_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
381 dest[num_dest_options].name = NULL;
383 while (list && list->name) {
384 if (get_option_parameter(dest, list->name) == NULL) {
385 dest[num_dest_options++] = *list;
386 dest[num_dest_options].name = NULL;
395 * Parses a parameter string (param) into an option list (dest).
397 * list is the template option list. If dest is NULL, a new copy of list is
398 * created. If list is NULL, this function fails.
400 * A parameter string consists of one or more parameters, separated by commas.
401 * Each parameter consists of its name and possibly of a value. In the latter
402 * case, the value is delimited by an = character. To specify a value which
403 * contains commas, double each comma so it won't be recognized as the end of
406 * For more details of the parsing see above.
408 * Returns a pointer to the first element of dest (or the newly allocated copy)
409 * or NULL in error cases
411 QEMUOptionParameter *parse_option_parameters(const char *param,
412 QEMUOptionParameter *list, QEMUOptionParameter *dest)
414 QEMUOptionParameter *allocated = NULL;
417 char *param_delim, *value_delim;
425 dest = allocated = append_option_parameters(NULL, list);
430 // Find parameter name and value in the string
431 param_delim = strchr(param, ',');
432 value_delim = strchr(param, '=');
434 if (value_delim && (value_delim < param_delim || !param_delim)) {
441 param = get_opt_name(name, sizeof(name), param, next_delim);
443 param = get_opt_value(value, sizeof(value), param + 1);
445 if (*param != '\0') {
450 if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
458 // Only free the list if it was newly allocated
459 free_option_parameters(allocated);
464 * Prints all options of a list that have a value to stdout
466 void print_option_parameters(QEMUOptionParameter *list)
468 while (list && list->name) {
469 switch (list->type) {
471 if (list->value.s != NULL) {
472 printf("%s='%s' ", list->name, list->value.s);
476 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
480 printf("%s=%" PRId64 " ", list->name, list->value.n);
483 printf("%s=(unkown type) ", list->name);
491 * Prints an overview of all available options
493 void print_option_help(QEMUOptionParameter *list)
495 printf("Supported options:\n");
496 while (list && list->name) {
497 printf("%-16s %s\n", list->name,
498 list->help ? list->help : "No description available");
503 /* ------------------------------------------------------------------ */
509 const QemuOptDesc *desc;
516 QTAILQ_ENTRY(QemuOpt) next;
523 QTAILQ_HEAD(QemuOptHead, QemuOpt) head;
524 QTAILQ_ENTRY(QemuOpts) next;
527 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
531 QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
532 if (strcmp(opt->name, name) != 0)
539 const char *qemu_opt_get(QemuOpts *opts, const char *name)
541 QemuOpt *opt = qemu_opt_find(opts, name);
542 return opt ? opt->str : NULL;
545 int qemu_opt_get_bool(QemuOpts *opts, const char *name, int defval)
547 QemuOpt *opt = qemu_opt_find(opts, name);
551 assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
552 return opt->value.boolean;
555 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
557 QemuOpt *opt = qemu_opt_find(opts, name);
561 assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
562 return opt->value.uint;
565 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
567 QemuOpt *opt = qemu_opt_find(opts, name);
571 assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
572 return opt->value.uint;
575 static int qemu_opt_parse(QemuOpt *opt)
577 if (opt->desc == NULL)
579 switch (opt->desc->type) {
580 case QEMU_OPT_STRING:
584 return parse_option_bool(opt->name, opt->str, &opt->value.boolean);
585 case QEMU_OPT_NUMBER:
586 return parse_option_number(opt->name, opt->str, &opt->value.uint);
588 return parse_option_size(opt->name, opt->str, &opt->value.uint);
594 static void qemu_opt_del(QemuOpt *opt)
596 QTAILQ_REMOVE(&opt->opts->head, opt, next);
597 qemu_free((/* !const */ char*)opt->name);
598 qemu_free((/* !const */ char*)opt->str);
602 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
605 const QemuOptDesc *desc = opts->list->desc;
608 for (i = 0; desc[i].name != NULL; i++) {
609 if (strcmp(desc[i].name, name) == 0) {
613 if (desc[i].name == NULL) {
615 /* empty list -> allow any */;
617 qerror_report(QERR_INVALID_PARAMETER, name);
622 opt = qemu_mallocz(sizeof(*opt));
623 opt->name = qemu_strdup(name);
625 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
626 if (desc[i].name != NULL) {
630 opt->str = qemu_strdup(value);
632 if (qemu_opt_parse(opt) < 0) {
639 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
640 int abort_on_failure)
645 QTAILQ_FOREACH(opt, &opts->head, next) {
646 rc = func(opt->name, opt->str, opaque);
647 if (abort_on_failure && rc != 0)
653 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
657 QTAILQ_FOREACH(opts, &list->head, next) {
661 if (strcmp(opts->id, id) != 0) {
669 static int id_wellformed(const char *id)
673 if (!qemu_isalpha(id[0])) {
676 for (i = 1; id[i]; i++) {
677 if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
684 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id, int fail_if_exists)
686 QemuOpts *opts = NULL;
689 if (!id_wellformed(id)) {
690 qerror_report(QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
691 error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
694 opts = qemu_opts_find(list, id);
696 if (fail_if_exists) {
697 qerror_report(QERR_DUPLICATE_ID, id, list->name);
704 opts = qemu_mallocz(sizeof(*opts));
706 opts->id = qemu_strdup(id);
709 loc_save(&opts->loc);
710 QTAILQ_INIT(&opts->head);
711 QTAILQ_INSERT_TAIL(&list->head, opts, next);
715 void qemu_opts_reset(QemuOptsList *list)
717 QemuOpts *opts, *next_opts;
719 QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
724 void qemu_opts_loc_restore(QemuOpts *opts)
726 loc_restore(&opts->loc);
729 int qemu_opts_set(QemuOptsList *list, const char *id,
730 const char *name, const char *value)
734 opts = qemu_opts_create(list, id, 1);
738 return qemu_opt_set(opts, name, value);
741 const char *qemu_opts_id(QemuOpts *opts)
746 void qemu_opts_del(QemuOpts *opts)
751 opt = QTAILQ_FIRST(&opts->head);
756 QTAILQ_REMOVE(&opts->list->head, opts, next);
761 int qemu_opts_print(QemuOpts *opts, void *dummy)
765 fprintf(stderr, "%s: %s:", opts->list->name,
766 opts->id ? opts->id : "<noid>");
767 QTAILQ_FOREACH(opt, &opts->head, next) {
768 fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
770 fprintf(stderr, "\n");
774 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
776 char option[128], value[1024];
777 const char *p,*pe,*pc;
779 for (p = params; *p != '\0'; p++) {
782 if (!pe || (pc && pc < pe)) {
783 /* found "foo,more" */
784 if (p == params && firstname) {
785 /* implicitly named first option */
786 pstrcpy(option, sizeof(option), firstname);
787 p = get_opt_value(value, sizeof(value), p);
789 /* option without value, probably a flag */
790 p = get_opt_name(option, sizeof(option), p, ',');
791 if (strncmp(option, "no", 2) == 0) {
792 memmove(option, option+2, strlen(option+2)+1);
793 pstrcpy(value, sizeof(value), "off");
795 pstrcpy(value, sizeof(value), "on");
799 /* found "foo=bar,more" */
800 p = get_opt_name(option, sizeof(option), p, '=');
805 p = get_opt_value(value, sizeof(value), p);
807 if (strcmp(option, "id") != 0) {
808 /* store and parse */
809 if (qemu_opt_set(opts, option, value) == -1) {
820 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
823 const char *firstname;
824 char value[1024], *id = NULL;
828 assert(!permit_abbrev || list->implied_opt_name);
829 firstname = permit_abbrev ? list->implied_opt_name : NULL;
831 if (strncmp(params, "id=", 3) == 0) {
832 get_opt_value(value, sizeof(value), params+3);
834 } else if ((p = strstr(params, ",id=")) != NULL) {
835 get_opt_value(value, sizeof(value), p+4);
838 opts = qemu_opts_create(list, id, 1);
842 if (qemu_opts_do_parse(opts, params, firstname) != 0) {
850 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
856 if (!strcmp(key, "id")) {
860 switch (qobject_type(obj)) {
862 value = qstring_get_str(qobject_to_qstring(obj));
865 n = snprintf(buf, sizeof(buf), "%" PRId64,
866 qint_get_int(qobject_to_qint(obj)));
867 assert(n < sizeof(buf));
871 n = snprintf(buf, sizeof(buf), "%.17g",
872 qfloat_get_double(qobject_to_qfloat(obj)));
873 assert(n < sizeof(buf));
877 pstrcpy(buf, sizeof(buf),
878 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
884 qemu_opt_set(opaque, key, value);
888 * Create QemuOpts from a QDict.
889 * Use value of key "id" as ID if it exists and is a QString.
890 * Only QStrings, QInts, QFloats and QBools are copied. Entries with
891 * other types are silently ignored.
893 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict)
897 opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1);
901 qdict_iter(qdict, qemu_opts_from_qdict_1, opts);
906 * Convert from QemuOpts to QDict.
907 * The QDict values are of type QString.
908 * TODO We'll want to use types appropriate for opt->desc->type, but
909 * this is enough for now.
911 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
920 qdict_put(qdict, "id", qstring_from_str(opts->id));
922 QTAILQ_FOREACH(opt, &opts->head, next) {
923 val = QOBJECT(qstring_from_str(opt->str));
924 qdict_put_obj(qdict, opt->name, val);
929 /* Validate parsed opts against descriptions where no
930 * descriptions were provided in the QemuOptsList.
932 int qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc)
936 assert(opts->list->desc[0].name == NULL);
938 QTAILQ_FOREACH(opt, &opts->head, next) {
941 for (i = 0; desc[i].name != NULL; i++) {
942 if (strcmp(desc[i].name, opt->name) == 0) {
946 if (desc[i].name == NULL) {
947 qerror_report(QERR_INVALID_PARAMETER, opt->name);
951 opt->desc = &desc[i];
953 if (qemu_opt_parse(opt) < 0) {
961 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
962 int abort_on_failure)
969 QTAILQ_FOREACH(opts, &list->head, next) {
970 loc_restore(&opts->loc);
971 rc |= func(opts, opaque);
972 if (abort_on_failure && rc != 0)