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FRET-qemu/util/qemu-option.c
Eric Blake 50b7b000c9 hmp: Allow for error message hints on HMP 
Commits 7216ae3d and d2828429 disabled some error message hints,
all because a change to use modern error reporting meant that the
hint would be output prior to the actual error.  Fix this by making
hints a first-class member of Error.

For example, we are now back to the pleasant:

 $ qemu-system-x86_64 --nodefaults -S --vnc :0 --chardev null,id=,
 qemu-system-x86_64: --chardev null,id=,: Parameter 'id' expects an identifier
 Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1441901956-21991-1-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2015-09-18 14:34:39 +02:00

1206 lines
31 KiB
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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-report.h"
#include "qapi/qmp/types.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qemu/option_int.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);
}
static void parse_option_bool(const char *name, const char *value, bool *ret,
Error **errp)
{
if (value != NULL) {
if (!strcmp(value, "on")) {
*ret = 1;
} else if (!strcmp(value, "off")) {
*ret = 0;
} else {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
name, "'on' or 'off'");
}
} else {
*ret = 1;
}
}
static void parse_option_number(const char *name, const char *value,
uint64_t *ret, Error **errp)
{
char *postfix;
uint64_t number;
if (value != NULL) {
number = strtoull(value, &postfix, 0);
if (*postfix != '\0') {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
return;
}
*ret = number;
} else {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a number");
}
}
static const QemuOptDesc *find_desc_by_name(const QemuOptDesc *desc,
const char *name)
{
int i;
for (i = 0; desc[i].name != NULL; i++) {
if (strcmp(desc[i].name, name) == 0) {
return &desc[i];
}
}
return NULL;
}
void parse_option_size(const char *name, const char *value,
uint64_t *ret, Error **errp)
{
char *postfix;
double sizef;
if (value != NULL) {
sizef = strtod(value, &postfix);
if (sizef < 0 || sizef > UINT64_MAX) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
"a non-negative number below 2^64");
return;
}
switch (*postfix) {
case 'T':
sizef *= 1024;
/* fall through */
case 'G':
sizef *= 1024;
/* fall through */
case 'M':
sizef *= 1024;
/* fall through */
case 'K':
case 'k':
sizef *= 1024;
/* fall through */
case 'b':
case '\0':
*ret = (uint64_t) sizef;
break;
default:
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
error_append_hint(errp, "You may use k, M, G or T suffixes for "
"kilobytes, megabytes, gigabytes and terabytes.");
return;
}
} else {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
}
}
bool has_help_option(const char *param)
{
size_t buflen = strlen(param) + 1;
char *buf = g_malloc(buflen);
const char *p = param;
bool result = false;
while (*p) {
p = get_opt_value(buf, buflen, p);
if (*p) {
p++;
}
if (is_help_option(buf)) {
result = true;
goto out;
}
}
out:
g_free(buf);
return result;
}
bool is_valid_option_list(const char *param)
{
size_t buflen = strlen(param) + 1;
char *buf = g_malloc(buflen);
const char *p = param;
bool result = true;
while (*p) {
p = get_opt_value(buf, buflen, p);
if (*p && !*++p) {
result = false;
goto out;
}
if (!*buf || *buf == ',') {
result = false;
goto out;
}
}
out:
g_free(buf);
return result;
}
void qemu_opts_print_help(QemuOptsList *list)
{
QemuOptDesc *desc;
assert(list);
desc = list->desc;
printf("Supported options:\n");
while (desc && desc->name) {
printf("%-16s %s\n", desc->name,
desc->help ? desc->help : "No description available");
desc++;
}
}
/* ------------------------------------------------------------------ */
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;
}
static void qemu_opt_del(QemuOpt *opt)
{
QTAILQ_REMOVE(&opt->opts->head, opt, next);
g_free(opt->name);
g_free(opt->str);
g_free(opt);
}
/* qemu_opt_set allows many settings for the same option.
* This function deletes all settings for an option.
*/
static void qemu_opt_del_all(QemuOpts *opts, const char *name)
{
QemuOpt *opt, *next_opt;
QTAILQ_FOREACH_SAFE(opt, &opts->head, next, next_opt) {
if (!strcmp(opt->name, name)) {
qemu_opt_del(opt);
}
}
}
const char *qemu_opt_get(QemuOpts *opts, const char *name)
{
QemuOpt *opt;
if (opts == NULL) {
return NULL;
}
opt = qemu_opt_find(opts, name);
if (!opt) {
const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
if (desc && desc->def_value_str) {
return desc->def_value_str;
}
}
return opt ? opt->str : NULL;
}
/* Get a known option (or its default) and remove it from the list
* all in one action. Return a malloced string of the option value.
* Result must be freed by caller with g_free().
*/
char *qemu_opt_get_del(QemuOpts *opts, const char *name)
{
QemuOpt *opt;
const QemuOptDesc *desc;
char *str = NULL;
if (opts == NULL) {
return NULL;
}
opt = qemu_opt_find(opts, name);
if (!opt) {
desc = find_desc_by_name(opts->list->desc, name);
if (desc && desc->def_value_str) {
str = g_strdup(desc->def_value_str);
}
return str;
}
str = opt->str;
opt->str = NULL;
qemu_opt_del_all(opts, name);
return str;
}
bool qemu_opt_has_help_opt(QemuOpts *opts)
{
QemuOpt *opt;
QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
if (is_help_option(opt->name)) {
return true;
}
}
return false;
}
static bool qemu_opt_get_bool_helper(QemuOpts *opts, const char *name,
bool defval, bool del)
{
QemuOpt *opt;
bool ret = defval;
if (opts == NULL) {
return ret;
}
opt = qemu_opt_find(opts, name);
if (opt == NULL) {
const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
if (desc && desc->def_value_str) {
parse_option_bool(name, desc->def_value_str, &ret, &error_abort);
}
return ret;
}
assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL);
ret = opt->value.boolean;
if (del) {
qemu_opt_del_all(opts, name);
}
return ret;
}
bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval)
{
return qemu_opt_get_bool_helper(opts, name, defval, false);
}
bool qemu_opt_get_bool_del(QemuOpts *opts, const char *name, bool defval)
{
return qemu_opt_get_bool_helper(opts, name, defval, true);
}
static uint64_t qemu_opt_get_number_helper(QemuOpts *opts, const char *name,
uint64_t defval, bool del)
{
QemuOpt *opt;
uint64_t ret = defval;
if (opts == NULL) {
return ret;
}
opt = qemu_opt_find(opts, name);
if (opt == NULL) {
const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
if (desc && desc->def_value_str) {
parse_option_number(name, desc->def_value_str, &ret, &error_abort);
}
return ret;
}
assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER);
ret = opt->value.uint;
if (del) {
qemu_opt_del_all(opts, name);
}
return ret;
}
uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval)
{
return qemu_opt_get_number_helper(opts, name, defval, false);
}
uint64_t qemu_opt_get_number_del(QemuOpts *opts, const char *name,
uint64_t defval)
{
return qemu_opt_get_number_helper(opts, name, defval, true);
}
static uint64_t qemu_opt_get_size_helper(QemuOpts *opts, const char *name,
uint64_t defval, bool del)
{
QemuOpt *opt;
uint64_t ret = defval;
if (opts == NULL) {
return ret;
}
opt = qemu_opt_find(opts, name);
if (opt == NULL) {
const QemuOptDesc *desc = find_desc_by_name(opts->list->desc, name);
if (desc && desc->def_value_str) {
parse_option_size(name, desc->def_value_str, &ret, &error_abort);
}
return ret;
}
assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE);
ret = opt->value.uint;
if (del) {
qemu_opt_del_all(opts, name);
}
return ret;
}
uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval)
{
return qemu_opt_get_size_helper(opts, name, defval, false);
}
uint64_t qemu_opt_get_size_del(QemuOpts *opts, const char *name,
uint64_t defval)
{
return qemu_opt_get_size_helper(opts, name, defval, true);
}
static void qemu_opt_parse(QemuOpt *opt, Error **errp)
{
if (opt->desc == NULL)
return;
switch (opt->desc->type) {
case QEMU_OPT_STRING:
/* nothing */
return;
case QEMU_OPT_BOOL:
parse_option_bool(opt->name, opt->str, &opt->value.boolean, errp);
break;
case QEMU_OPT_NUMBER:
parse_option_number(opt->name, opt->str, &opt->value.uint, errp);
break;
case QEMU_OPT_SIZE:
parse_option_size(opt->name, opt->str, &opt->value.uint, errp);
break;
default:
abort();
}
}
static bool opts_accepts_any(const QemuOpts *opts)
{
return opts->list->desc[0].name == NULL;
}
int qemu_opt_unset(QemuOpts *opts, const char *name)
{
QemuOpt *opt = qemu_opt_find(opts, name);
assert(opts_accepts_any(opts));
if (opt == NULL) {
return -1;
} else {
qemu_opt_del(opt);
return 0;
}
}
static void opt_set(QemuOpts *opts, const char *name, const char *value,
bool prepend, Error **errp)
{
QemuOpt *opt;
const QemuOptDesc *desc;
Error *local_err = NULL;
desc = find_desc_by_name(opts->list->desc, name);
if (!desc && !opts_accepts_any(opts)) {
error_setg(errp, QERR_INVALID_PARAMETER, name);
return;
}
opt = g_malloc0(sizeof(*opt));
opt->name = g_strdup(name);
opt->opts = opts;
if (prepend) {
QTAILQ_INSERT_HEAD(&opts->head, opt, next);
} else {
QTAILQ_INSERT_TAIL(&opts->head, opt, next);
}
opt->desc = desc;
opt->str = g_strdup(value);
qemu_opt_parse(opt, &local_err);
if (local_err) {
error_propagate(errp, local_err);
qemu_opt_del(opt);
}
}
void qemu_opt_set(QemuOpts *opts, const char *name, const char *value,
Error **errp)
{
opt_set(opts, name, value, false, errp);
}
void qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val,
Error **errp)
{
QemuOpt *opt;
const QemuOptDesc *desc = opts->list->desc;
opt = g_malloc0(sizeof(*opt));
opt->desc = find_desc_by_name(desc, name);
if (!opt->desc && !opts_accepts_any(opts)) {
error_setg(errp, QERR_INVALID_PARAMETER, name);
g_free(opt);
return;
}
opt->name = g_strdup(name);
opt->opts = opts;
opt->value.boolean = !!val;
opt->str = g_strdup(val ? "on" : "off");
QTAILQ_INSERT_TAIL(&opts->head, opt, next);
}
void qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val,
Error **errp)
{
QemuOpt *opt;
const QemuOptDesc *desc = opts->list->desc;
opt = g_malloc0(sizeof(*opt));
opt->desc = find_desc_by_name(desc, name);
if (!opt->desc && !opts_accepts_any(opts)) {
error_setg(errp, QERR_INVALID_PARAMETER, name);
g_free(opt);
return;
}
opt->name = g_strdup(name);
opt->opts = opts;
opt->value.uint = val;
opt->str = g_strdup_printf("%" PRId64, val);
QTAILQ_INSERT_TAIL(&opts->head, opt, next);
}
/**
* For each member of @opts, call @func(@opaque, name, value, @errp).
* @func() may store an Error through @errp, but must return non-zero then.
* When @func() returns non-zero, break the loop and return that value.
* Return zero when the loop completes.
*/
int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
Error **errp)
{
QemuOpt *opt;
int rc;
QTAILQ_FOREACH(opt, &opts->head, next) {
rc = func(opaque, opt->name, opt->str, errp);
if (rc) {
return rc;
}
assert(!errp || !*errp);
}
return 0;
}
QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id)
{
QemuOpts *opts;
QTAILQ_FOREACH(opts, &list->head, next) {
if (!opts->id && !id) {
return opts;
}
if (opts->id && id && !strcmp(opts->id, id)) {
return opts;
}
}
return NULL;
}
QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
int fail_if_exists, Error **errp)
{
QemuOpts *opts = NULL;
if (id) {
if (!id_wellformed(id)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id",
"an identifier");
error_append_hint(errp, "Identifiers consist of letters, digits, "
"'-', '.', '_', starting with a letter.");
return NULL;
}
opts = qemu_opts_find(list, id);
if (opts != NULL) {
if (fail_if_exists && !list->merge_lists) {
error_setg(errp, "Duplicate ID '%s' for %s", id, list->name);
return NULL;
} else {
return opts;
}
}
} else if (list->merge_lists) {
opts = qemu_opts_find(list, NULL);
if (opts) {
return opts;
}
}
opts = g_malloc0(sizeof(*opts));
opts->id = g_strdup(id);
opts->list = list;
loc_save(&opts->loc);
QTAILQ_INIT(&opts->head);
QTAILQ_INSERT_TAIL(&list->head, opts, next);
return opts;
}
void qemu_opts_reset(QemuOptsList *list)
{
QemuOpts *opts, *next_opts;
QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
qemu_opts_del(opts);
}
}
void qemu_opts_loc_restore(QemuOpts *opts)
{
loc_restore(&opts->loc);
}
void qemu_opts_set(QemuOptsList *list, const char *id,
const char *name, const char *value, Error **errp)
{
QemuOpts *opts;
Error *local_err = NULL;
opts = qemu_opts_create(list, id, 1, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
qemu_opt_set(opts, name, value, errp);
}
const char *qemu_opts_id(QemuOpts *opts)
{
return opts->id;
}
/* The id string will be g_free()d by qemu_opts_del */
void qemu_opts_set_id(QemuOpts *opts, char *id)
{
opts->id = id;
}
void qemu_opts_del(QemuOpts *opts)
{
QemuOpt *opt;
if (opts == NULL) {
return;
}
for (;;) {
opt = QTAILQ_FIRST(&opts->head);
if (opt == NULL)
break;
qemu_opt_del(opt);
}
QTAILQ_REMOVE(&opts->list->head, opts, next);
g_free(opts->id);
g_free(opts);
}
/* print value, escaping any commas in value */
static void escaped_print(const char *value)
{
const char *ptr;
for (ptr = value; *ptr; ++ptr) {
if (*ptr == ',') {
putchar(',');
}
putchar(*ptr);
}
}
void qemu_opts_print(QemuOpts *opts, const char *separator)
{
QemuOpt *opt;
QemuOptDesc *desc = opts->list->desc;
const char *sep = "";
if (opts->id) {
printf("id=%s", opts->id); /* passed id_wellformed -> no commas */
sep = separator;
}
if (desc[0].name == NULL) {
QTAILQ_FOREACH(opt, &opts->head, next) {
printf("%s%s=", sep, opt->name);
escaped_print(opt->str);
sep = separator;
}
return;
}
for (; desc && desc->name; desc++) {
const char *value;
QemuOpt *opt = qemu_opt_find(opts, desc->name);
value = opt ? opt->str : desc->def_value_str;
if (!value) {
continue;
}
if (desc->type == QEMU_OPT_STRING) {
printf("%s%s=", sep, desc->name);
escaped_print(value);
} else if ((desc->type == QEMU_OPT_SIZE ||
desc->type == QEMU_OPT_NUMBER) && opt) {
printf("%s%s=%" PRId64, sep, desc->name, opt->value.uint);
} else {
printf("%s%s=%s", sep, desc->name, value);
}
sep = separator;
}
}
static void opts_do_parse(QemuOpts *opts, const char *params,
const char *firstname, bool prepend, Error **errp)
{
char option[128], value[1024];
const char *p,*pe,*pc;
Error *local_err = NULL;
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 */
opt_set(opts, option, value, prepend, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
if (*p != ',') {
break;
}
}
}
/**
* Store options parsed from @params into @opts.
* If @firstname is non-null, the first key=value in @params may omit
* key=, and is treated as if key was @firstname.
* On error, store an error object through @errp if non-null.
*/
void qemu_opts_do_parse(QemuOpts *opts, const char *params,
const char *firstname, Error **errp)
{
opts_do_parse(opts, params, firstname, false, errp);
}
static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
bool permit_abbrev, bool defaults, Error **errp)
{
const char *firstname;
char value[1024], *id = NULL;
const char *p;
QemuOpts *opts;
Error *local_err = NULL;
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;
}
/*
* This code doesn't work for defaults && !list->merge_lists: when
* params has no id=, and list has an element with !opts->id, it
* appends a new element instead of returning the existing opts.
* However, we got no use for this case. Guard against possible
* (if unlikely) future misuse:
*/
assert(!defaults || list->merge_lists);
opts = qemu_opts_create(list, id, !defaults, &local_err);
if (opts == NULL) {
error_propagate(errp, local_err);
return NULL;
}
opts_do_parse(opts, params, firstname, defaults, &local_err);
if (local_err) {
error_propagate(errp, local_err);
qemu_opts_del(opts);
return NULL;
}
return opts;
}
/**
* Create a QemuOpts in @list and with options parsed from @params.
* If @permit_abbrev, the first key=value in @params may omit key=,
* and is treated as if key was @list->implied_opt_name.
* On error, store an error object through @errp if non-null.
* Return the new QemuOpts on success, null pointer on error.
*/
QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params,
bool permit_abbrev, Error **errp)
{
return opts_parse(list, params, permit_abbrev, false, errp);
}
/**
* Create a QemuOpts in @list and with options parsed from @params.
* If @permit_abbrev, the first key=value in @params may omit key=,
* and is treated as if key was @list->implied_opt_name.
* Report errors with error_report_err(). This is inappropriate in
* QMP context. Do not use this function there!
* Return the new QemuOpts on success, null pointer on error.
*/
QemuOpts *qemu_opts_parse_noisily(QemuOptsList *list, const char *params,
bool permit_abbrev)
{
Error *err = NULL;
QemuOpts *opts;
opts = opts_parse(list, params, permit_abbrev, false, &err);
if (err) {
error_report_err(err);
}
return opts;
}
void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
int permit_abbrev)
{
QemuOpts *opts;
opts = opts_parse(list, params, permit_abbrev, true, NULL);
assert(opts);
}
typedef struct OptsFromQDictState {
QemuOpts *opts;
Error **errp;
} OptsFromQDictState;
static void qemu_opts_from_qdict_1(const char *key, QObject *obj, void *opaque)
{
OptsFromQDictState *state = opaque;
char buf[32];
const char *value;
int n;
if (!strcmp(key, "id") || *state->errp) {
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_bool(qobject_to_qbool(obj)) ? "on" : "off");
value = buf;
break;
default:
return;
}
qemu_opt_set(state->opts, key, value, state->errp);
}
/*
* 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,
Error **errp)
{
OptsFromQDictState state;
Error *local_err = NULL;
QemuOpts *opts;
opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return NULL;
}
assert(opts != NULL);
state.errp = &local_err;
state.opts = opts;
qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
if (local_err) {
error_propagate(errp, local_err);
qemu_opts_del(opts);
return NULL;
}
return opts;
}
/*
* Adds all QDict entries to the QemuOpts that can be added and removes them
* from the QDict. When this function returns, the QDict contains only those
* entries that couldn't be added to the QemuOpts.
*/
void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
{
const QDictEntry *entry, *next;
entry = qdict_first(qdict);
while (entry != NULL) {
Error *local_err = NULL;
OptsFromQDictState state = {
.errp = &local_err,
.opts = opts,
};
next = qdict_next(qdict, entry);
if (find_desc_by_name(opts->list->desc, entry->key)) {
qemu_opts_from_qdict_1(entry->key, entry->value, &state);
if (local_err) {
error_propagate(errp, local_err);
return;
} else {
qdict_del(qdict, entry->key);
}
}
entry = next;
}
}
/*
* 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.
*/
void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
{
QemuOpt *opt;
Error *local_err = NULL;
assert(opts_accepts_any(opts));
QTAILQ_FOREACH(opt, &opts->head, next) {
opt->desc = find_desc_by_name(desc, opt->name);
if (!opt->desc) {
error_setg(errp, QERR_INVALID_PARAMETER, opt->name);
return;
}
qemu_opt_parse(opt, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
}
/**
* For each member of @list, call @func(@opaque, member, @errp).
* Call it with the current location temporarily set to the member's.
* @func() may store an Error through @errp, but must return non-zero then.
* When @func() returns non-zero, break the loop and return that value.
* Return zero when the loop completes.
*/
int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
void *opaque, Error **errp)
{
Location loc;
QemuOpts *opts;
int rc;
loc_push_none(&loc);
QTAILQ_FOREACH(opts, &list->head, next) {
loc_restore(&opts->loc);
rc = func(opaque, opts, errp);
if (rc) {
return rc;
}
assert(!errp || !*errp);
}
loc_pop(&loc);
return 0;
}
static size_t count_opts_list(QemuOptsList *list)
{
QemuOptDesc *desc = NULL;
size_t num_opts = 0;
if (!list) {
return 0;
}
desc = list->desc;
while (desc && desc->name) {
num_opts++;
desc++;
}
return num_opts;
}
void qemu_opts_free(QemuOptsList *list)
{
g_free(list);
}
/* Realloc dst option list and append options from an option list (list)
* to it. dst could be NULL or a malloced list.
* The lifetime of dst must be shorter than the input list because the
* QemuOptDesc->name, ->help, and ->def_value_str strings are shared.
*/
QemuOptsList *qemu_opts_append(QemuOptsList *dst,
QemuOptsList *list)
{
size_t num_opts, num_dst_opts;
QemuOptDesc *desc;
bool need_init = false;
bool need_head_update;
if (!list) {
return dst;
}
/* If dst is NULL, after realloc, some area of dst should be initialized
* before adding options to it.
*/
if (!dst) {
need_init = true;
need_head_update = true;
} else {
/* Moreover, even if dst is not NULL, the realloc may move it to a
* different address in which case we may get a stale tail pointer
* in dst->head. */
need_head_update = QTAILQ_EMPTY(&dst->head);
}
num_opts = count_opts_list(dst);
num_dst_opts = num_opts;
num_opts += count_opts_list(list);
dst = g_realloc(dst, sizeof(QemuOptsList) +
(num_opts + 1) * sizeof(QemuOptDesc));
if (need_init) {
dst->name = NULL;
dst->implied_opt_name = NULL;
dst->merge_lists = false;
}
if (need_head_update) {
QTAILQ_INIT(&dst->head);
}
dst->desc[num_dst_opts].name = NULL;
/* append list->desc to dst->desc */
if (list) {
desc = list->desc;
while (desc && desc->name) {
if (find_desc_by_name(dst->desc, desc->name) == NULL) {
dst->desc[num_dst_opts++] = *desc;
dst->desc[num_dst_opts].name = NULL;
}
desc++;
}
}
return dst;
}
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