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.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, bool *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);
230 *ret = (uint64_t) sizef;
233 qerror_report(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 qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
246 * Sets the value of a parameter in a given option list. The parsing of the
247 * value depends on the type of option:
249 * OPT_FLAG (uses value.n):
250 * If no value is given, the flag is set to 1.
251 * Otherwise the value must be "on" (set to 1) or "off" (set to 0)
253 * OPT_STRING (uses value.s):
254 * value is strdup()ed and assigned as option value
256 * OPT_SIZE (uses value.n):
257 * The value is converted to an integer. Suffixes for kilobytes etc. are
258 * allowed (powers of 1024).
260 * Returns 0 on succes, -1 in error cases
262 int set_option_parameter(QEMUOptionParameter *list, const char *name,
267 // Find a matching parameter
268 list = get_option_parameter(list, name);
270 fprintf(stderr, "Unknown option '%s'\n", name);
275 switch (list->type) {
277 if (parse_option_bool(name, value, &flag) == -1)
279 list->value.n = flag;
284 list->value.s = g_strdup(value);
286 fprintf(stderr, "Option '%s' needs a parameter\n", name);
292 if (parse_option_size(name, value, &list->value.n) == -1)
297 fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
305 * Sets the given parameter to an integer instead of a string.
306 * This function cannot be used to set string options.
308 * Returns 0 on success, -1 in error cases
310 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
313 // Find a matching parameter
314 list = get_option_parameter(list, name);
316 fprintf(stderr, "Unknown option '%s'\n", name);
321 switch (list->type) {
325 list->value.n = value;
336 * Frees a option list. If it contains strings, the strings are freed as well.
338 void free_option_parameters(QEMUOptionParameter *list)
340 QEMUOptionParameter *cur = list;
342 while (cur && cur->name) {
343 if (cur->type == OPT_STRING) {
344 g_free(cur->value.s);
353 * Count valid options in list
355 static size_t count_option_parameters(QEMUOptionParameter *list)
357 size_t num_options = 0;
359 while (list && list->name) {
368 * Append an option list (list) to an option list (dest).
370 * If dest is NULL, a new copy of list is created.
372 * Returns a pointer to the first element of dest (or the newly allocated copy)
374 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
375 QEMUOptionParameter *list)
377 size_t num_options, num_dest_options;
379 num_options = count_option_parameters(dest);
380 num_dest_options = num_options;
382 num_options += count_option_parameters(list);
384 dest = g_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
385 dest[num_dest_options].name = NULL;
387 while (list && list->name) {
388 if (get_option_parameter(dest, list->name) == NULL) {
389 dest[num_dest_options++] = *list;
390 dest[num_dest_options].name = NULL;
399 * Parses a parameter string (param) into an option list (dest).
401 * list is the template option list. If dest is NULL, a new copy of list is
402 * created. If list is NULL, this function fails.
404 * A parameter string consists of one or more parameters, separated by commas.
405 * Each parameter consists of its name and possibly of a value. In the latter
406 * case, the value is delimited by an = character. To specify a value which
407 * contains commas, double each comma so it won't be recognized as the end of
410 * For more details of the parsing see above.
412 * Returns a pointer to the first element of dest (or the newly allocated copy)
413 * or NULL in error cases
415 QEMUOptionParameter *parse_option_parameters(const char *param,
416 QEMUOptionParameter *list, QEMUOptionParameter *dest)
418 QEMUOptionParameter *allocated = NULL;
421 char *param_delim, *value_delim;
429 dest = allocated = append_option_parameters(NULL, list);
434 // Find parameter name and value in the string
435 param_delim = strchr(param, ',');
436 value_delim = strchr(param, '=');
438 if (value_delim && (value_delim < param_delim || !param_delim)) {
445 param = get_opt_name(name, sizeof(name), param, next_delim);
447 param = get_opt_value(value, sizeof(value), param + 1);
449 if (*param != '\0') {
454 if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
462 // Only free the list if it was newly allocated
463 free_option_parameters(allocated);
468 * Prints all options of a list that have a value to stdout
470 void print_option_parameters(QEMUOptionParameter *list)
472 while (list && list->name) {
473 switch (list->type) {
475 if (list->value.s != NULL) {
476 printf("%s='%s' ", list->name, list->value.s);
480 printf("%s=%s ", list->name, list->value.n ? "on" : "off");
484 printf("%s=%" PRId64 " ", list->name, list->value.n);
487 printf("%s=(unknown type) ", list->name);
495 * Prints an overview of all available options
497 void print_option_help(QEMUOptionParameter *list)
499 printf("Supported options:\n");
500 while (list && list->name) {
501 printf("%-16s %s\n", list->name,
502 list->help ? list->help : "No description available");
507 /* ------------------------------------------------------------------ */
513 const QemuOptDesc *desc;
520 QTAILQ_ENTRY(QemuOpt) next;
527 QTAILQ_HEAD(QemuOptHead, QemuOpt) head;
528 QTAILQ_ENTRY(QemuOpts) next;
531 static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
535 QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
536 if (strcmp(opt->name, name) != 0)
543 const char *qemu_opt_get(QemuOpts *opts, const char *name)
545 QemuOpt *opt = qemu_opt_find(opts, name);
546 return opt ? opt->str : NULL;
549 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
551 QemuOpt *opt = qemu_opt_find(opts, name);
555 assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
556 return opt->value.boolean;
559 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
561 QemuOpt *opt = qemu_opt_find(opts, name);
565 assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
566 return opt->value.uint;
569 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
571 QemuOpt *opt = qemu_opt_find(opts, name);
575 assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
576 return opt->value.uint;
579 static int qemu_opt_parse(QemuOpt *opt)
581 if (opt->desc == NULL)
583 switch (opt->desc->type) {
584 case QEMU_OPT_STRING:
588 return parse_option_bool(opt->name, opt->str, &opt->value.boolean);
589 case QEMU_OPT_NUMBER:
590 return parse_option_number(opt->name, opt->str, &opt->value.uint);
592 return parse_option_size(opt->name, opt->str, &opt->value.uint);
598 static void qemu_opt_del(QemuOpt *opt)
600 QTAILQ_REMOVE(&opt->opts->head, opt, next);
601 g_free((/* !const */ char*)opt->name);
602 g_free((/* !const */ char*)opt->str);
606 static int opt_set(QemuOpts *opts, const char *name, const char *value,
610 const QemuOptDesc *desc = opts->list->desc;
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 qerror_report(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 if (qemu_opt_parse(opt) < 0) {
648 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
650 return opt_set(opts, name, value, false);
653 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
656 const QemuOptDesc *desc = opts->list->desc;
659 for (i = 0; desc[i].name != NULL; i++) {
660 if (strcmp(desc[i].name, name) == 0) {
664 if (desc[i].name == NULL) {
666 /* empty list -> allow any */;
668 qerror_report(QERR_INVALID_PARAMETER, name);
673 opt = g_malloc0(sizeof(*opt));
674 opt->name = g_strdup(name);
676 QTAILQ_INSERT_TAIL(&opts->head, opt, next);
677 if (desc[i].name != NULL) {
680 opt->value.boolean = !!val;
684 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
685 int abort_on_failure)
690 QTAILQ_FOREACH(opt, &opts->head, next) {
691 rc = func(opt->name, opt->str, opaque);
692 if (abort_on_failure && rc != 0)
698 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
702 QTAILQ_FOREACH(opts, &list->head, next) {
709 if (strcmp(opts->id, id) != 0) {
717 static int id_wellformed(const char *id)
721 if (!qemu_isalpha(id[0])) {
724 for (i = 1; id[i]; i++) {
725 if (!qemu_isalnum(id[i]) && !strchr("-._", id[i])) {
732 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id, int fail_if_exists)
734 QemuOpts *opts = NULL;
737 if (!id_wellformed(id)) {
738 qerror_report(QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
739 error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
742 opts = qemu_opts_find(list, id);
744 if (fail_if_exists && !list->merge_lists) {
745 qerror_report(QERR_DUPLICATE_ID, id, list->name);
751 } else if (list->merge_lists) {
752 opts = qemu_opts_find(list, NULL);
757 opts = g_malloc0(sizeof(*opts));
759 opts->id = g_strdup(id);
762 loc_save(&opts->loc);
763 QTAILQ_INIT(&opts->head);
764 QTAILQ_INSERT_TAIL(&list->head, opts, next);
768 void qemu_opts_reset(QemuOptsList *list)
770 QemuOpts *opts, *next_opts;
772 QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
777 void qemu_opts_loc_restore(QemuOpts *opts)
779 loc_restore(&opts->loc);
782 int qemu_opts_set(QemuOptsList *list, const char *id,
783 const char *name, const char *value)
787 opts = qemu_opts_create(list, id, 1);
791 return qemu_opt_set(opts, name, value);
794 const char *qemu_opts_id(QemuOpts *opts)
799 void qemu_opts_del(QemuOpts *opts)
804 opt = QTAILQ_FIRST(&opts->head);
809 QTAILQ_REMOVE(&opts->list->head, opts, next);
814 int qemu_opts_print(QemuOpts *opts, void *dummy)
818 fprintf(stderr, "%s: %s:", opts->list->name,
819 opts->id ? opts->id : "<noid>");
820 QTAILQ_FOREACH(opt, &opts->head, next) {
821 fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
823 fprintf(stderr, "\n");
827 static int opts_do_parse(QemuOpts *opts, const char *params,
828 const char *firstname, bool prepend)
830 char option[128], value[1024];
831 const char *p,*pe,*pc;
833 for (p = params; *p != '\0'; p++) {
836 if (!pe || (pc && pc < pe)) {
837 /* found "foo,more" */
838 if (p == params && firstname) {
839 /* implicitly named first option */
840 pstrcpy(option, sizeof(option), firstname);
841 p = get_opt_value(value, sizeof(value), p);
843 /* option without value, probably a flag */
844 p = get_opt_name(option, sizeof(option), p, ',');
845 if (strncmp(option, "no", 2) == 0) {
846 memmove(option, option+2, strlen(option+2)+1);
847 pstrcpy(value, sizeof(value), "off");
849 pstrcpy(value, sizeof(value), "on");
853 /* found "foo=bar,more" */
854 p = get_opt_name(option, sizeof(option), p, '=');
859 p = get_opt_value(value, sizeof(value), p);
861 if (strcmp(option, "id") != 0) {
862 /* store and parse */
863 if (opt_set(opts, option, value, prepend) == -1) {
874 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
876 return opts_do_parse(opts, params, firstname, false);
879 static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
880 int permit_abbrev, bool defaults)
882 const char *firstname;
883 char value[1024], *id = NULL;
887 assert(!permit_abbrev || list->implied_opt_name);
888 firstname = permit_abbrev ? list->implied_opt_name : NULL;
890 if (strncmp(params, "id=", 3) == 0) {
891 get_opt_value(value, sizeof(value), params+3);
893 } else if ((p = strstr(params, ",id=")) != NULL) {
894 get_opt_value(value, sizeof(value), p+4);
898 if (!id && !QTAILQ_EMPTY(&list->head)) {
899 opts = qemu_opts_find(list, NULL);
901 opts = qemu_opts_create(list, id, 0);
904 opts = qemu_opts_create(list, id, 1);
909 if (opts_do_parse(opts, params, firstname, defaults) != 0) {
917 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
920 return opts_parse(list, params, permit_abbrev, false);
923 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
928 opts = opts_parse(list, params, permit_abbrev, true);
932 static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
938 if (!strcmp(key, "id")) {
942 switch (qobject_type(obj)) {
944 value = qstring_get_str(qobject_to_qstring(obj));
947 n = snprintf(buf, sizeof(buf), "%" PRId64,
948 qint_get_int(qobject_to_qint(obj)));
949 assert(n < sizeof(buf));
953 n = snprintf(buf, sizeof(buf), "%.17g",
954 qfloat_get_double(qobject_to_qfloat(obj)));
955 assert(n < sizeof(buf));
959 pstrcpy(buf, sizeof(buf),
960 qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
966 qemu_opt_set(opaque, key, value);
970 * Create QemuOpts from a QDict.
971 * Use value of key "id" as ID if it exists and is a QString.
972 * Only QStrings, QInts, QFloats and QBools are copied. Entries with
973 * other types are silently ignored.
975 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict)
979 opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1);
983 qdict_iter(qdict, qemu_opts_from_qdict_1, opts);
988 * Convert from QemuOpts to QDict.
989 * The QDict values are of type QString.
990 * TODO We'll want to use types appropriate for opt->desc->type, but
991 * this is enough for now.
993 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
1002 qdict_put(qdict, "id", qstring_from_str(opts->id));
1004 QTAILQ_FOREACH(opt, &opts->head, next) {
1005 val = QOBJECT(qstring_from_str(opt->str));
1006 qdict_put_obj(qdict, opt->name, val);
1011 /* Validate parsed opts against descriptions where no
1012 * descriptions were provided in the QemuOptsList.
1014 int qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc)
1018 assert(opts->list->desc[0].name == NULL);
1020 QTAILQ_FOREACH(opt, &opts->head, next) {
1023 for (i = 0; desc[i].name != NULL; i++) {
1024 if (strcmp(desc[i].name, opt->name) == 0) {
1028 if (desc[i].name == NULL) {
1029 qerror_report(QERR_INVALID_PARAMETER, opt->name);
1033 opt->desc = &desc[i];
1035 if (qemu_opt_parse(opt) < 0) {
1043 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
1044 int abort_on_failure)
1050 loc_push_none(&loc);
1051 QTAILQ_FOREACH(opts, &list->head, next) {
1052 loc_restore(&opts->loc);
1053 rc |= func(opts, opaque);
1054 if (abort_on_failure && rc != 0)