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qemu/qemu-option.c

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/*
* Commandline option parsing functions
*
* Copyright (c) 2003-2008 Fabrice Bellard
* Copyright (c) 2009 Kevin Wolf <kwolf@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include "qemu-common.h"
#include "qemu-error.h"
#include "qemu-objects.h"
#include "qemu-option.h"
#include "qerror.h"
/*
* Extracts the name of an option from the parameter string (p points at the
* first byte of the option name)
*
* The option name is delimited by delim (usually , or =) or the string end
* and is copied into buf. If the option name is longer than buf_size, it is
* truncated. buf is always zero terminated.
*
* The return value is the position of the delimiter/zero byte after the option
* name in p.
*/
const char *get_opt_name(char *buf, int buf_size, const char *p, char delim)
{
char *q;
q = buf;
while (*p != '\0' && *p != delim) {
if (q && (q - buf) < buf_size - 1)
*q++ = *p;
p++;
}
if (q)
*q = '\0';
return p;
}
/*
* Extracts the value of an option from the parameter string p (p points at the
* first byte of the option value)
*
* This function is comparable to get_opt_name with the difference that the
* delimiter is fixed to be comma which starts a new option. To specify an
* option value that contains commas, double each comma.
*/
const char *get_opt_value(char *buf, int buf_size, const char *p)
{
char *q;
q = buf;
while (*p != '\0') {
if (*p == ',') {
if (*(p + 1) != ',')
break;
p++;
}
if (q && (q - buf) < buf_size - 1)
*q++ = *p;
p++;
}
if (q)
*q = '\0';
return p;
}
int get_next_param_value(char *buf, int buf_size,
const char *tag, const char **pstr)
{
const char *p;
char option[128];
p = *pstr;
for(;;) {
p = get_opt_name(option, sizeof(option), p, '=');
if (*p != '=')
break;
p++;
if (!strcmp(tag, option)) {
*pstr = get_opt_value(buf, buf_size, p);
if (**pstr == ',') {
(*pstr)++;
}
return strlen(buf);
} else {
p = get_opt_value(NULL, 0, p);
}
if (*p != ',')
break;
p++;
}
return 0;
}
int get_param_value(char *buf, int buf_size,
const char *tag, const char *str)
{
return get_next_param_value(buf, buf_size, tag, &str);
}
int check_params(char *buf, int buf_size,
const char * const *params, const char *str)
{
const char *p;
int i;
p = str;
while (*p != '\0') {
p = get_opt_name(buf, buf_size, p, '=');
if (*p != '=') {
return -1;
}
p++;
for (i = 0; params[i] != NULL; i++) {
if (!strcmp(params[i], buf)) {
break;
}
}
if (params[i] == NULL) {
return -1;
}
p = get_opt_value(NULL, 0, p);
if (*p != ',') {
break;
}
p++;
}
return 0;
}
/*
* Searches an option list for an option with the given name
*/
QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
const char *name)
{
while (list && list->name) {
if (!strcmp(list->name, name)) {
return list;
}
list++;
}
return NULL;
}
static int parse_option_bool(const char *name, const char *value, int *ret)
{
if (value != NULL) {
if (!strcmp(value, "on")) {
*ret = 1;
} else if (!strcmp(value, "off")) {
*ret = 0;
} else {
qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "'on' or 'off'");
return -1;
}
} else {
*ret = 1;
}
return 0;
}
static int parse_option_number(const char *name, const char *value, uint64_t *ret)
{
char *postfix;
uint64_t number;
if (value != NULL) {
number = strtoull(value, &postfix, 0);
if (*postfix != '\0') {
qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a number");
return -1;
}
*ret = number;
} else {
qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a number");
return -1;
}
return 0;
}
static int parse_option_size(const char *name, const char *value, uint64_t *ret)
{
char *postfix;
double sizef;
if (value != NULL) {
sizef = strtod(value, &postfix);
switch (*postfix) {
case 'T':
sizef *= 1024;
case 'G':
sizef *= 1024;
case 'M':
sizef *= 1024;
case 'K':
case 'k':
sizef *= 1024;
case 'b':
case '\0':
*ret = (uint64_t) sizef;
break;
default:
qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
error_printf_unless_qmp("You may use k, M, G or T suffixes for "
"kilobytes, megabytes, gigabytes and terabytes.\n");
return -1;
}
} else {
qerror_report(QERR_INVALID_PARAMETER_VALUE, name, "a size");
return -1;
}
return 0;
}
/*
* Sets the value of a parameter in a given option list. The parsing of the
* value depends on the type of option:
*
* OPT_FLAG (uses value.n):
* If no value is given, the flag is set to 1.
* Otherwise the value must be "on" (set to 1) or "off" (set to 0)
*
* OPT_STRING (uses value.s):
* value is strdup()ed and assigned as option value
*
* OPT_SIZE (uses value.n):
* The value is converted to an integer. Suffixes for kilobytes etc. are
* allowed (powers of 1024).
*
* Returns 0 on succes, -1 in error cases
*/
int set_option_parameter(QEMUOptionParameter *list, const char *name,
const char *value)
{
int flag;
// Find a matching parameter
list = get_option_parameter(list, name);
if (list == NULL) {
fprintf(stderr, "Unknown option '%s'\n", name);
return -1;
}
// Process parameter
switch (list->type) {
case OPT_FLAG:
if (parse_option_bool(name, value, &flag) == -1)
return -1;
list->value.n = flag;
break;
case OPT_STRING:
if (value != NULL) {
list->value.s = qemu_strdup(value);
} else {
fprintf(stderr, "Option '%s' needs a parameter\n", name);
return -1;
}
break;
case OPT_SIZE:
if (parse_option_size(name, value, &list->value.n) == -1)
return -1;
break;
default:
fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name);
return -1;
}
return 0;
}
/*
* Sets the given parameter to an integer instead of a string.
* This function cannot be used to set string options.
*
* Returns 0 on success, -1 in error cases
*/
int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
uint64_t value)
{
// Find a matching parameter
list = get_option_parameter(list, name);
if (list == NULL) {
fprintf(stderr, "Unknown option '%s'\n", name);
return -1;
}
// Process parameter
switch (list->type) {
case OPT_FLAG:
case OPT_NUMBER:
case OPT_SIZE:
list->value.n = value;
break;
default:
return -1;
}
return 0;
}
/*
* Frees a option list. If it contains strings, the strings are freed as well.
*/
void free_option_parameters(QEMUOptionParameter *list)
{
QEMUOptionParameter *cur = list;
while (cur && cur->name) {
if (cur->type == OPT_STRING) {
qemu_free(cur->value.s);
}
cur++;
}
qemu_free(list);
}
/*
* Count valid options in list
*/
static size_t count_option_parameters(QEMUOptionParameter *list)
{
size_t num_options = 0;
while (list && list->name) {
num_options++;
list++;
}
return num_options;
}
/*
* Append an option list (list) to an option list (dest).
*
* If dest is NULL, a new copy of list is created.
*
* Returns a pointer to the first element of dest (or the newly allocated copy)
*/
QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
QEMUOptionParameter *list)
{
size_t num_options, num_dest_options;
num_options = count_option_parameters(dest);
num_dest_options = num_options;
num_options += count_option_parameters(list);
dest = qemu_realloc(dest, (num_options + 1) * sizeof(QEMUOptionParameter));
while (list && list->name) {
if (get_option_parameter(dest, list->name) == NULL) {
dest[num_dest_options++] = *list;
dest[num_dest_options].name = NULL;
}
list++;
}
return dest;
}
/*
* Parses a parameter string (param) into an option list (dest).
*
* list is the templace is. If dest is NULL, a new copy of list is created for
* it. If list is NULL, this function fails.
*
* A parameter string consists of one or more parameters, separated by commas.
* Each parameter consists of its name and possibly of a value. In the latter
* case, the value is delimited by an = character. To specify a value which
* contains commas, double each comma so it won't be recognized as the end of
* the parameter.
*
* For more details of the parsing see above.
*
* Returns a pointer to the first element of dest (or the newly allocated copy)
* or NULL in error cases
*/
QEMUOptionParameter *parse_option_parameters(const char *param,
QEMUOptionParameter *list, QEMUOptionParameter *dest)
{
QEMUOptionParameter *allocated = NULL;
char name[256];
char value[256];
char *param_delim, *value_delim;
char next_delim;
size_t num_options;
if (list == NULL) {
return NULL;
}
if (dest == NULL) {
// Count valid options
num_options = count_option_parameters(list);
// Create a copy of the option list to fill in values
dest = qemu_mallocz((num_options + 1) * sizeof(QEMUOptionParameter));
allocated = dest;
memcpy(dest, list, (num_options + 1) * sizeof(QEMUOptionParameter));
}
while (*param) {
// Find parameter name and value in the string
param_delim = strchr(param, ',');
value_delim = strchr(param, '=');
if (value_delim && (value_delim < param_delim || !param_delim)) {
next_delim = '=';
} else {
next_delim = ',';
value_delim = NULL;
}
param = get_opt_name(name, sizeof(name), param, next_delim);
if (value_delim) {
param = get_opt_value(value, sizeof(value), param + 1);
}
if (*param != '\0') {
param++;
}
// Set the parameter
if (set_option_parameter(dest, name, value_delim ? value : NULL)) {
goto fail;
}
}
return dest;
fail:
// Only free the list if it was newly allocated
free_option_parameters(allocated);
return NULL;
}
/*
* Prints all options of a list that have a value to stdout
*/
void print_option_parameters(QEMUOptionParameter *list)
{
while (list && list->name) {
switch (list->type) {
case OPT_STRING:
if (list->value.s != NULL) {
printf("%s='%s' ", list->name, list->value.s);
}
break;
case OPT_FLAG:
printf("%s=%s ", list->name, list->value.n ? "on" : "off");
break;
case OPT_SIZE:
case OPT_NUMBER:
printf("%s=%" PRId64 " ", list->name, list->value.n);
break;
default:
printf("%s=(unkown type) ", list->name);
break;
}
list++;
}
}
/*
* Prints an overview of all available options
*/
void print_option_help(QEMUOptionParameter *list)
{
printf("Supported options:\n");
while (list && list->name) {
printf("%-16s %s\n", list->name,
list->help ? list->help : "No description available");
list++;
}
}
/* ------------------------------------------------------------------ */
struct QemuOpt {
const char *name;
const char *str;
const QemuOptDesc *desc;
union {
int boolean;
uint64_t uint;
} value;
QemuOpts *opts;
QTAILQ_ENTRY(QemuOpt) next;
};
struct QemuOpts {
char *id;
QemuOptsList *list;
Location loc;
QTAILQ_HEAD(QemuOptHead, QemuOpt) head;
QTAILQ_ENTRY(QemuOpts) next;
};
static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
{
QemuOpt *opt;
QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
if (strcmp(opt->name, name) != 0)
continue;
return opt;
}
return NULL;
}
const char *qemu_opt_get(QemuOpts *opts, const char *name)
{
QemuOpt *opt = qemu_opt_find(opts, name);
return opt ? opt->str : NULL;
}
int qemu_opt_get_bool(QemuOpts *opts, const char *name, int defval)
{
QemuOpt *opt = qemu_opt_find(opts, name);
if (opt == NULL)
return defval;
assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
return opt->value.boolean;
}
uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
{
QemuOpt *opt = qemu_opt_find(opts, name);
if (opt == NULL)
return defval;
assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
return opt->value.uint;
}
uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
{
QemuOpt *opt = qemu_opt_find(opts, name);
if (opt == NULL)
return defval;
assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
return opt->value.uint;
}
static int qemu_opt_parse(QemuOpt *opt)
{
if (opt->desc == NULL)
return 0;
switch (opt->desc->type) {
case QEMU_OPT_STRING:
/* nothing */
return 0;
case QEMU_OPT_BOOL:
return parse_option_bool(opt->name, opt->str, &opt->value.boolean);
case QEMU_OPT_NUMBER:
return parse_option_number(opt->name, opt->str, &opt->value.uint);
case QEMU_OPT_SIZE:
return parse_option_size(opt->name, opt->str, &opt->value.uint);
default:
abort();
}
}
static void qemu_opt_del(QemuOpt *opt)
{
QTAILQ_REMOVE(&opt->opts->head, opt, next);
qemu_free((/* !const */ char*)opt->name);
qemu_free((/* !const */ char*)opt->str);
qemu_free(opt);
}
int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
{
QemuOpt *opt;
const QemuOptDesc *desc = opts->list->desc;
int i;
for (i = 0; desc[i].name != NULL; i++) {
if (strcmp(desc[i].name, name) == 0) {
break;
}
}
if (desc[i].name == NULL) {
if (i == 0) {
/* empty list -> allow any */;
} else {
qerror_report(QERR_INVALID_PARAMETER, name);
return -1;
}
}
opt = qemu_mallocz(sizeof(*opt));
opt->name = qemu_strdup(name);
opt->opts = opts;
QTAILQ_INSERT_TAIL(&opts->head, opt, next);
if (desc[i].name != NULL) {
opt->desc = desc+i;
}
if (value) {
opt->str = qemu_strdup(value);
}
if (qemu_opt_parse(opt) < 0) {
qemu_opt_del(opt);
return -1;
}
return 0;
}
int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
int abort_on_failure)
{
QemuOpt *opt;
int rc = 0;
QTAILQ_FOREACH(opt, &opts->head, next) {
rc = func(opt->name, opt->str, opaque);
if (abort_on_failure && rc != 0)
break;
}
return rc;
}
QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
{
QemuOpts *opts;
QTAILQ_FOREACH(opts, &list->head, next) {
if (!opts->id) {
continue;
}
if (strcmp(opts->id, id) != 0) {
continue;
}
return opts;
}
return NULL;
}
QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id, int fail_if_exists)
{
QemuOpts *opts = NULL;
if (id) {
opts = qemu_opts_find(list, id);
if (opts != NULL) {
if (fail_if_exists) {
qerror_report(QERR_DUPLICATE_ID, id, list->name);
return NULL;
} else {
return opts;
}
}
}
opts = qemu_mallocz(sizeof(*opts));
if (id) {
opts->id = qemu_strdup(id);
}
opts->list = list;
loc_save(&opts->loc);
QTAILQ_INIT(&opts->head);
QTAILQ_INSERT_TAIL(&list->head, opts, next);
return opts;
}
int qemu_opts_set(QemuOptsList *list, const char *id,
const char *name, const char *value)
{
QemuOpts *opts;
opts = qemu_opts_create(list, id, 1);
if (opts == NULL) {
return -1;
}
return qemu_opt_set(opts, name, value);
}
const char *qemu_opts_id(QemuOpts *opts)
{
return opts->id;
}
void qemu_opts_del(QemuOpts *opts)
{
QemuOpt *opt;
for (;;) {
opt = QTAILQ_FIRST(&opts->head);
if (opt == NULL)
break;
qemu_opt_del(opt);
}
QTAILQ_REMOVE(&opts->list->head, opts, next);
qemu_free(opts->id);
qemu_free(opts);
}
int qemu_opts_print(QemuOpts *opts, void *dummy)
{
QemuOpt *opt;
fprintf(stderr, "%s: %s:", opts->list->name,
opts->id ? opts->id : "<noid>");
QTAILQ_FOREACH(opt, &opts->head, next) {
fprintf(stderr, " %s=\"%s\"", opt->name, opt->str);
}
fprintf(stderr, "\n");
return 0;
}
int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname)
{
char option[128], value[1024];
const char *p,*pe,*pc;
for (p = params; *p != '\0'; p++) {
pe = strchr(p, '=');
pc = strchr(p, ',');
if (!pe || (pc && pc < pe)) {
/* found "foo,more" */
if (p == params && firstname) {
/* implicitly named first option */
pstrcpy(option, sizeof(option), firstname);
p = get_opt_value(value, sizeof(value), p);
} else {
/* option without value, probably a flag */
p = get_opt_name(option, sizeof(option), p, ',');
if (strncmp(option, "no", 2) == 0) {
memmove(option, option+2, strlen(option+2)+1);
pstrcpy(value, sizeof(value), "off");
} else {
pstrcpy(value, sizeof(value), "on");
}
}
} else {
/* found "foo=bar,more" */
p = get_opt_name(option, sizeof(option), p, '=');
if (*p != '=') {
break;
}
p++;
p = get_opt_value(value, sizeof(value), p);
}
if (strcmp(option, "id") != 0) {
/* store and parse */
if (qemu_opt_set(opts, option, value) == -1) {
return -1;
}
}
if (*p != ',') {
break;
}
}
return 0;
}
QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
int permit_abbrev)
{
const char *firstname;
char value[1024], *id = NULL;
const char *p;
QemuOpts *opts;
assert(!permit_abbrev || list->implied_opt_name);
firstname = permit_abbrev ? list->implied_opt_name : NULL;
if (strncmp(params, "id=", 3) == 0) {
get_opt_value(value, sizeof(value), params+3);
id = value;
} else if ((p = strstr(params, ",id=")) != NULL) {
get_opt_value(value, sizeof(value), p+4);
id = value;
}
opts = qemu_opts_create(list, id, 1);
if (opts == NULL)
return NULL;
if (qemu_opts_do_parse(opts, params, firstname) != 0) {
qemu_opts_del(opts);
return NULL;
}
return opts;
}
static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
{
char buf[32];
const char *value;
int n;
if (!strcmp(key, "id")) {
return;
}
switch (qobject_type(obj)) {
case QTYPE_QSTRING:
value = qstring_get_str(qobject_to_qstring(obj));
break;
case QTYPE_QINT:
n = snprintf(buf, sizeof(buf), "%" PRId64,
qint_get_int(qobject_to_qint(obj)));
assert(n < sizeof(buf));
value = buf;
break;
case QTYPE_QFLOAT:
n = snprintf(buf, sizeof(buf), "%.17g",
qfloat_get_double(qobject_to_qfloat(obj)));
assert(n < sizeof(buf));
value = buf;
break;
case QTYPE_QBOOL:
pstrcpy(buf, sizeof(buf),
qbool_get_int(qobject_to_qbool(obj)) ? "on" : "off");
value = buf;
break;
default:
return;
}
qemu_opt_set(opaque, key, value);
}
/*
* Create QemuOpts from a QDict.
* Use value of key "id" as ID if it exists and is a QString.
* Only QStrings, QInts, QFloats and QBools are copied. Entries with
* other types are silently ignored.
*/
QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict)
{
QemuOpts *opts;
opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1);
if (opts == NULL)
return NULL;
qdict_iter(qdict, qemu_opts_from_qdict_1, opts);
return opts;
}
/*
* Convert from QemuOpts to QDict.
* The QDict values are of type QString.
* TODO We'll want to use types appropriate for opt->desc->type, but
* this is enough for now.
*/
QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
{
QemuOpt *opt;
QObject *val;
if (!qdict) {
qdict = qdict_new();
}
if (opts->id) {
qdict_put(qdict, "id", qstring_from_str(opts->id));
}
QTAILQ_FOREACH(opt, &opts->head, next) {
val = QOBJECT(qstring_from_str(opt->str));
qdict_put_obj(qdict, opt->name, val);
}
return qdict;
}
/* Validate parsed opts against descriptions where no
* descriptions were provided in the QemuOptsList.
*/
int qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc)
{
QemuOpt *opt;
assert(opts->list->desc[0].name == NULL);
QTAILQ_FOREACH(opt, &opts->head, next) {
int i;
for (i = 0; desc[i].name != NULL; i++) {
if (strcmp(desc[i].name, opt->name) == 0) {
break;
}
}
if (desc[i].name == NULL) {
qerror_report(QERR_INVALID_PARAMETER, opt->name);
return -1;
}
opt->desc = &desc[i];
if (qemu_opt_parse(opt) < 0) {
return -1;
}
}
return 0;
}
int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
int abort_on_failure)
{
Location loc;
QemuOpts *opts;
int rc = 0;
loc_push_none(&loc);
QTAILQ_FOREACH(opts, &list->head, next) {
loc_restore(&opts->loc);
rc |= func(opts, opaque);
if (abort_on_failure && rc != 0)
break;
}
loc_pop(&loc);
return rc;
}
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