mirror of
https://gitlab.com/qemu-project/qemu.git
synced 2024-10-13 14:52:34 +03:00
79854b9544
Building QEMU on Fedora 37 (Rawhide Prerelease) ppc64le failed with the following error: $ ../configure --prefix=/usr/local/qemu-disabletcg --target-list=ppc-softmmu,ppc64-softmmu --disable-tcg --disable-linux-user ... $ make -j$(nproc) ... In file included from /root/qemu/include/qapi/qmp/qdict.h:16, from /root/qemu/include/block/qdict.h:13, from ../qobject/block-qdict.c:11: /root/qemu/include/qapi/qmp/qobject.h: In function ‘qdict_array_split’: /root/qemu/include/qapi/qmp/qobject.h:49:17: error: ‘subqdict’ may be used uninitialized [-Werror=maybe-uninitialized] 49 | typeof(obj) _obj = (obj); \ | ^~~~ ../qobject/block-qdict.c:227:16: note: ‘subqdict’ declared here 227 | QDict *subqdict; | ^~~~~~~~ cc1: all warnings being treated as errors Fix build failure by expanding the ternary operation. Tested with `make check-unit` (the check-block-qdict test passed). Signed-off-by: Murilo Opsfelder Araujo <muriloo@linux.ibm.com> Cc: Kevin Wolf <kwolf@redhat.com> Cc: Hanna Reitz <hreitz@redhat.com> Cc: Markus Armbruster <armbru@redhat.com> Message-Id: <20220311221634.58288-1-muriloo@linux.ibm.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
739 lines
22 KiB
C
739 lines
22 KiB
C
/*
|
|
* Special QDict functions used by the block layer
|
|
*
|
|
* Copyright (c) 2013-2018 Red Hat, Inc.
|
|
*
|
|
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
|
|
* See the COPYING.LIB file in the top-level directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "block/qdict.h"
|
|
#include "qapi/qmp/qbool.h"
|
|
#include "qapi/qmp/qlist.h"
|
|
#include "qapi/qmp/qnum.h"
|
|
#include "qapi/qmp/qstring.h"
|
|
#include "qapi/qobject-input-visitor.h"
|
|
#include "qemu/cutils.h"
|
|
#include "qapi/error.h"
|
|
|
|
/**
|
|
* qdict_copy_default(): If no entry mapped by 'key' exists in 'dst' yet, the
|
|
* value of 'key' in 'src' is copied there (and the refcount increased
|
|
* accordingly).
|
|
*/
|
|
void qdict_copy_default(QDict *dst, QDict *src, const char *key)
|
|
{
|
|
QObject *val;
|
|
|
|
if (qdict_haskey(dst, key)) {
|
|
return;
|
|
}
|
|
|
|
val = qdict_get(src, key);
|
|
if (val) {
|
|
qdict_put_obj(dst, key, qobject_ref(val));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qdict_set_default_str(): If no entry mapped by 'key' exists in 'dst' yet, a
|
|
* new QString initialised by 'val' is put there.
|
|
*/
|
|
void qdict_set_default_str(QDict *dst, const char *key, const char *val)
|
|
{
|
|
if (qdict_haskey(dst, key)) {
|
|
return;
|
|
}
|
|
|
|
qdict_put_str(dst, key, val);
|
|
}
|
|
|
|
static void qdict_flatten_qdict(QDict *qdict, QDict *target,
|
|
const char *prefix);
|
|
|
|
static void qdict_flatten_qlist(QList *qlist, QDict *target, const char *prefix)
|
|
{
|
|
QObject *value;
|
|
const QListEntry *entry;
|
|
QDict *dict_val;
|
|
QList *list_val;
|
|
char *new_key;
|
|
int i;
|
|
|
|
/* This function is never called with prefix == NULL, i.e., it is always
|
|
* called from within qdict_flatten_q(list|dict)(). Therefore, it does not
|
|
* need to remove list entries during the iteration (the whole list will be
|
|
* deleted eventually anyway from qdict_flatten_qdict()). */
|
|
assert(prefix);
|
|
|
|
entry = qlist_first(qlist);
|
|
|
|
for (i = 0; entry; entry = qlist_next(entry), i++) {
|
|
value = qlist_entry_obj(entry);
|
|
dict_val = qobject_to(QDict, value);
|
|
list_val = qobject_to(QList, value);
|
|
new_key = g_strdup_printf("%s.%i", prefix, i);
|
|
|
|
/*
|
|
* Flatten non-empty QDict and QList recursively into @target,
|
|
* copy other objects to @target
|
|
*/
|
|
if (dict_val && qdict_size(dict_val)) {
|
|
qdict_flatten_qdict(dict_val, target, new_key);
|
|
} else if (list_val && !qlist_empty(list_val)) {
|
|
qdict_flatten_qlist(list_val, target, new_key);
|
|
} else {
|
|
qdict_put_obj(target, new_key, qobject_ref(value));
|
|
}
|
|
|
|
g_free(new_key);
|
|
}
|
|
}
|
|
|
|
static void qdict_flatten_qdict(QDict *qdict, QDict *target, const char *prefix)
|
|
{
|
|
QObject *value;
|
|
const QDictEntry *entry, *next;
|
|
QDict *dict_val;
|
|
QList *list_val;
|
|
char *key, *new_key;
|
|
|
|
entry = qdict_first(qdict);
|
|
|
|
while (entry != NULL) {
|
|
next = qdict_next(qdict, entry);
|
|
value = qdict_entry_value(entry);
|
|
dict_val = qobject_to(QDict, value);
|
|
list_val = qobject_to(QList, value);
|
|
|
|
if (prefix) {
|
|
key = new_key = g_strdup_printf("%s.%s", prefix, entry->key);
|
|
} else {
|
|
key = entry->key;
|
|
new_key = NULL;
|
|
}
|
|
|
|
/*
|
|
* Flatten non-empty QDict and QList recursively into @target,
|
|
* copy other objects to @target.
|
|
* On the root level (if @qdict == @target), remove flattened
|
|
* nested QDicts and QLists from @qdict.
|
|
*
|
|
* (Note that we do not need to remove entries from nested
|
|
* dicts or lists. Their reference count is decremented on
|
|
* the root level, so there are no leaks. In fact, if they
|
|
* have a reference count greater than one, we are probably
|
|
* well advised not to modify them altogether.)
|
|
*/
|
|
if (dict_val && qdict_size(dict_val)) {
|
|
qdict_flatten_qdict(dict_val, target, key);
|
|
if (target == qdict) {
|
|
qdict_del(qdict, entry->key);
|
|
}
|
|
} else if (list_val && !qlist_empty(list_val)) {
|
|
qdict_flatten_qlist(list_val, target, key);
|
|
if (target == qdict) {
|
|
qdict_del(qdict, entry->key);
|
|
}
|
|
} else if (target != qdict) {
|
|
qdict_put_obj(target, key, qobject_ref(value));
|
|
}
|
|
|
|
g_free(new_key);
|
|
entry = next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qdict_flatten(): For each nested non-empty QDict with key x, all
|
|
* fields with key y are moved to this QDict and their key is renamed
|
|
* to "x.y". For each nested non-empty QList with key x, the field at
|
|
* index y is moved to this QDict with the key "x.y" (i.e., the
|
|
* reverse of what qdict_array_split() does).
|
|
* This operation is applied recursively for nested QDicts and QLists.
|
|
*/
|
|
void qdict_flatten(QDict *qdict)
|
|
{
|
|
qdict_flatten_qdict(qdict, qdict, NULL);
|
|
}
|
|
|
|
/* extract all the src QDict entries starting by start into dst.
|
|
* If dst is NULL then the entries are simply removed from src. */
|
|
void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start)
|
|
|
|
{
|
|
const QDictEntry *entry, *next;
|
|
const char *p;
|
|
|
|
if (dst) {
|
|
*dst = qdict_new();
|
|
}
|
|
entry = qdict_first(src);
|
|
|
|
while (entry != NULL) {
|
|
next = qdict_next(src, entry);
|
|
if (strstart(entry->key, start, &p)) {
|
|
if (dst) {
|
|
qdict_put_obj(*dst, p, qobject_ref(entry->value));
|
|
}
|
|
qdict_del(src, entry->key);
|
|
}
|
|
entry = next;
|
|
}
|
|
}
|
|
|
|
static int qdict_count_prefixed_entries(const QDict *src, const char *start)
|
|
{
|
|
const QDictEntry *entry;
|
|
int count = 0;
|
|
|
|
for (entry = qdict_first(src); entry; entry = qdict_next(src, entry)) {
|
|
if (strstart(entry->key, start, NULL)) {
|
|
if (count == INT_MAX) {
|
|
return -ERANGE;
|
|
}
|
|
count++;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* qdict_array_split(): This function moves array-like elements of a QDict into
|
|
* a new QList. Every entry in the original QDict with a key "%u" or one
|
|
* prefixed "%u.", where %u designates an unsigned integer starting at 0 and
|
|
* incrementally counting up, will be moved to a new QDict at index %u in the
|
|
* output QList with the key prefix removed, if that prefix is "%u.". If the
|
|
* whole key is just "%u", the whole QObject will be moved unchanged without
|
|
* creating a new QDict. The function terminates when there is no entry in the
|
|
* QDict with a prefix directly (incrementally) following the last one; it also
|
|
* returns if there are both entries with "%u" and "%u." for the same index %u.
|
|
* Example: {"0.a": 42, "0.b": 23, "1.x": 0, "4.y": 1, "o.o": 7, "2": 66}
|
|
* (or {"1.x": 0, "4.y": 1, "0.a": 42, "o.o": 7, "0.b": 23, "2": 66})
|
|
* => [{"a": 42, "b": 23}, {"x": 0}, 66]
|
|
* and {"4.y": 1, "o.o": 7} (remainder of the old QDict)
|
|
*/
|
|
void qdict_array_split(QDict *src, QList **dst)
|
|
{
|
|
unsigned i;
|
|
|
|
*dst = qlist_new();
|
|
|
|
for (i = 0; i < UINT_MAX; i++) {
|
|
QObject *subqobj;
|
|
bool is_subqdict;
|
|
QDict *subqdict;
|
|
char indexstr[32], prefix[32];
|
|
size_t snprintf_ret;
|
|
|
|
snprintf_ret = snprintf(indexstr, 32, "%u", i);
|
|
assert(snprintf_ret < 32);
|
|
|
|
subqobj = qdict_get(src, indexstr);
|
|
|
|
snprintf_ret = snprintf(prefix, 32, "%u.", i);
|
|
assert(snprintf_ret < 32);
|
|
|
|
/* Overflow is the same as positive non-zero results */
|
|
is_subqdict = qdict_count_prefixed_entries(src, prefix);
|
|
|
|
/*
|
|
* There may be either a single subordinate object (named
|
|
* "%u") or multiple objects (each with a key prefixed "%u."),
|
|
* but not both.
|
|
*/
|
|
if (!subqobj == !is_subqdict) {
|
|
break;
|
|
}
|
|
|
|
if (is_subqdict) {
|
|
qdict_extract_subqdict(src, &subqdict, prefix);
|
|
assert(qdict_size(subqdict) > 0);
|
|
qlist_append_obj(*dst, QOBJECT(subqdict));
|
|
} else {
|
|
qobject_ref(subqobj);
|
|
qdict_del(src, indexstr);
|
|
qlist_append_obj(*dst, subqobj);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qdict_split_flat_key:
|
|
* @key: the key string to split
|
|
* @prefix: non-NULL pointer to hold extracted prefix
|
|
* @suffix: non-NULL pointer to remaining suffix
|
|
*
|
|
* Given a flattened key such as 'foo.0.bar', split it into two parts
|
|
* at the first '.' separator. Allows double dot ('..') to escape the
|
|
* normal separator.
|
|
*
|
|
* e.g.
|
|
* 'foo.0.bar' -> prefix='foo' and suffix='0.bar'
|
|
* 'foo..0.bar' -> prefix='foo.0' and suffix='bar'
|
|
*
|
|
* The '..' sequence will be unescaped in the returned 'prefix'
|
|
* string. The 'suffix' string will be left in escaped format, so it
|
|
* can be fed back into the qdict_split_flat_key() key as the input
|
|
* later.
|
|
*
|
|
* The caller is responsible for freeing the string returned in @prefix
|
|
* using g_free().
|
|
*/
|
|
static void qdict_split_flat_key(const char *key, char **prefix,
|
|
const char **suffix)
|
|
{
|
|
const char *separator;
|
|
size_t i, j;
|
|
|
|
/* Find first '.' separator, but if there is a pair '..'
|
|
* that acts as an escape, so skip over '..' */
|
|
separator = NULL;
|
|
do {
|
|
if (separator) {
|
|
separator += 2;
|
|
} else {
|
|
separator = key;
|
|
}
|
|
separator = strchr(separator, '.');
|
|
} while (separator && separator[1] == '.');
|
|
|
|
if (separator) {
|
|
*prefix = g_strndup(key, separator - key);
|
|
*suffix = separator + 1;
|
|
} else {
|
|
*prefix = g_strdup(key);
|
|
*suffix = NULL;
|
|
}
|
|
|
|
/* Unescape the '..' sequence into '.' */
|
|
for (i = 0, j = 0; (*prefix)[i] != '\0'; i++, j++) {
|
|
if ((*prefix)[i] == '.') {
|
|
assert((*prefix)[i + 1] == '.');
|
|
i++;
|
|
}
|
|
(*prefix)[j] = (*prefix)[i];
|
|
}
|
|
(*prefix)[j] = '\0';
|
|
}
|
|
|
|
/**
|
|
* qdict_is_list:
|
|
* @maybe_list: dict to check if keys represent list elements.
|
|
*
|
|
* Determine whether all keys in @maybe_list are valid list elements.
|
|
* If @maybe_list is non-zero in length and all the keys look like
|
|
* valid list indexes, this will return 1. If @maybe_list is zero
|
|
* length or all keys are non-numeric then it will return 0 to indicate
|
|
* it is a normal qdict. If there is a mix of numeric and non-numeric
|
|
* keys, or the list indexes are non-contiguous, an error is reported.
|
|
*
|
|
* Returns: 1 if a valid list, 0 if a dict, -1 on error
|
|
*/
|
|
static int qdict_is_list(QDict *maybe_list, Error **errp)
|
|
{
|
|
const QDictEntry *ent;
|
|
ssize_t len = 0;
|
|
ssize_t max = -1;
|
|
int is_list = -1;
|
|
int64_t val;
|
|
|
|
for (ent = qdict_first(maybe_list); ent != NULL;
|
|
ent = qdict_next(maybe_list, ent)) {
|
|
int is_index = !qemu_strtoi64(ent->key, NULL, 10, &val);
|
|
|
|
if (is_list == -1) {
|
|
is_list = is_index;
|
|
}
|
|
|
|
if (is_index != is_list) {
|
|
error_setg(errp, "Cannot mix list and non-list keys");
|
|
return -1;
|
|
}
|
|
|
|
if (is_index) {
|
|
len++;
|
|
if (val > max) {
|
|
max = val;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (is_list == -1) {
|
|
assert(!qdict_size(maybe_list));
|
|
is_list = 0;
|
|
}
|
|
|
|
/* NB this isn't a perfect check - e.g. it won't catch
|
|
* a list containing '1', '+1', '01', '3', but that
|
|
* does not matter - we've still proved that the
|
|
* input is a list. It is up the caller to do a
|
|
* stricter check if desired */
|
|
if (len != (max + 1)) {
|
|
error_setg(errp, "List indices are not contiguous, "
|
|
"saw %zd elements but %zd largest index",
|
|
len, max);
|
|
return -1;
|
|
}
|
|
|
|
return is_list;
|
|
}
|
|
|
|
/**
|
|
* qdict_crumple:
|
|
* @src: the original flat dictionary (only scalar values) to crumple
|
|
*
|
|
* Takes a flat dictionary whose keys use '.' separator to indicate
|
|
* nesting, and values are scalars, empty dictionaries or empty lists,
|
|
* and crumples it into a nested structure.
|
|
*
|
|
* To include a literal '.' in a key name, it must be escaped as '..'
|
|
*
|
|
* For example, an input of:
|
|
*
|
|
* { 'foo.0.bar': 'one', 'foo.0.wizz': '1',
|
|
* 'foo.1.bar': 'two', 'foo.1.wizz': '2' }
|
|
*
|
|
* will result in an output of:
|
|
*
|
|
* {
|
|
* 'foo': [
|
|
* { 'bar': 'one', 'wizz': '1' },
|
|
* { 'bar': 'two', 'wizz': '2' }
|
|
* ],
|
|
* }
|
|
*
|
|
* The following scenarios in the input dict will result in an
|
|
* error being returned:
|
|
*
|
|
* - Any values in @src are non-scalar types
|
|
* - If keys in @src imply that a particular level is both a
|
|
* list and a dict. e.g., "foo.0.bar" and "foo.eek.bar".
|
|
* - If keys in @src imply that a particular level is a list,
|
|
* but the indices are non-contiguous. e.g. "foo.0.bar" and
|
|
* "foo.2.bar" without any "foo.1.bar" present.
|
|
* - If keys in @src represent list indexes, but are not in
|
|
* the "%zu" format. e.g. "foo.+0.bar"
|
|
*
|
|
* Returns: either a QDict or QList for the nested data structure, or NULL
|
|
* on error
|
|
*/
|
|
QObject *qdict_crumple(const QDict *src, Error **errp)
|
|
{
|
|
const QDictEntry *ent;
|
|
QDict *two_level, *multi_level = NULL, *child_dict;
|
|
QDict *dict_val;
|
|
QList *list_val;
|
|
QObject *dst = NULL, *child;
|
|
size_t i;
|
|
char *prefix = NULL;
|
|
const char *suffix = NULL;
|
|
int is_list;
|
|
|
|
two_level = qdict_new();
|
|
|
|
/* Step 1: split our totally flat dict into a two level dict */
|
|
for (ent = qdict_first(src); ent != NULL; ent = qdict_next(src, ent)) {
|
|
dict_val = qobject_to(QDict, ent->value);
|
|
list_val = qobject_to(QList, ent->value);
|
|
if ((dict_val && qdict_size(dict_val))
|
|
|| (list_val && !qlist_empty(list_val))) {
|
|
error_setg(errp, "Value %s is not flat", ent->key);
|
|
goto error;
|
|
}
|
|
|
|
qdict_split_flat_key(ent->key, &prefix, &suffix);
|
|
child = qdict_get(two_level, prefix);
|
|
child_dict = qobject_to(QDict, child);
|
|
|
|
if (child) {
|
|
/*
|
|
* If @child_dict, then all previous keys with this prefix
|
|
* had a suffix. If @suffix, this one has one as well,
|
|
* and we're good, else there's a clash.
|
|
*/
|
|
if (!child_dict || !suffix) {
|
|
error_setg(errp, "Cannot mix scalar and non-scalar keys");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
if (suffix) {
|
|
if (!child_dict) {
|
|
child_dict = qdict_new();
|
|
qdict_put(two_level, prefix, child_dict);
|
|
}
|
|
qdict_put_obj(child_dict, suffix, qobject_ref(ent->value));
|
|
} else {
|
|
qdict_put_obj(two_level, prefix, qobject_ref(ent->value));
|
|
}
|
|
|
|
g_free(prefix);
|
|
prefix = NULL;
|
|
}
|
|
|
|
/* Step 2: optionally process the two level dict recursively
|
|
* into a multi-level dict */
|
|
multi_level = qdict_new();
|
|
for (ent = qdict_first(two_level); ent != NULL;
|
|
ent = qdict_next(two_level, ent)) {
|
|
dict_val = qobject_to(QDict, ent->value);
|
|
if (dict_val && qdict_size(dict_val)) {
|
|
child = qdict_crumple(dict_val, errp);
|
|
if (!child) {
|
|
goto error;
|
|
}
|
|
|
|
qdict_put_obj(multi_level, ent->key, child);
|
|
} else {
|
|
qdict_put_obj(multi_level, ent->key, qobject_ref(ent->value));
|
|
}
|
|
}
|
|
qobject_unref(two_level);
|
|
two_level = NULL;
|
|
|
|
/* Step 3: detect if we need to turn our dict into list */
|
|
is_list = qdict_is_list(multi_level, errp);
|
|
if (is_list < 0) {
|
|
goto error;
|
|
}
|
|
|
|
if (is_list) {
|
|
dst = QOBJECT(qlist_new());
|
|
|
|
for (i = 0; i < qdict_size(multi_level); i++) {
|
|
char *key = g_strdup_printf("%zu", i);
|
|
|
|
child = qdict_get(multi_level, key);
|
|
g_free(key);
|
|
|
|
if (!child) {
|
|
error_setg(errp, "Missing list index %zu", i);
|
|
goto error;
|
|
}
|
|
|
|
qlist_append_obj(qobject_to(QList, dst), qobject_ref(child));
|
|
}
|
|
qobject_unref(multi_level);
|
|
multi_level = NULL;
|
|
} else {
|
|
dst = QOBJECT(multi_level);
|
|
}
|
|
|
|
return dst;
|
|
|
|
error:
|
|
g_free(prefix);
|
|
qobject_unref(multi_level);
|
|
qobject_unref(two_level);
|
|
qobject_unref(dst);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* qdict_crumple_for_keyval_qiv:
|
|
* @src: the flat dictionary (only scalar values) to crumple
|
|
* @errp: location to store error
|
|
*
|
|
* Like qdict_crumple(), but additionally transforms scalar values so
|
|
* the result can be passed to qobject_input_visitor_new_keyval().
|
|
*
|
|
* The block subsystem uses this function to prepare its flat QDict
|
|
* with possibly confused scalar types for a visit. It should not be
|
|
* used for anything else, and it should go away once the block
|
|
* subsystem has been cleaned up.
|
|
*/
|
|
static QObject *qdict_crumple_for_keyval_qiv(QDict *src, Error **errp)
|
|
{
|
|
QDict *tmp = NULL;
|
|
char *buf;
|
|
const char *s;
|
|
const QDictEntry *ent;
|
|
QObject *dst;
|
|
|
|
for (ent = qdict_first(src); ent; ent = qdict_next(src, ent)) {
|
|
buf = NULL;
|
|
switch (qobject_type(ent->value)) {
|
|
case QTYPE_QNULL:
|
|
case QTYPE_QSTRING:
|
|
continue;
|
|
case QTYPE_QNUM:
|
|
s = buf = qnum_to_string(qobject_to(QNum, ent->value));
|
|
break;
|
|
case QTYPE_QDICT:
|
|
case QTYPE_QLIST:
|
|
/* @src isn't flat; qdict_crumple() will fail */
|
|
continue;
|
|
case QTYPE_QBOOL:
|
|
s = qbool_get_bool(qobject_to(QBool, ent->value))
|
|
? "on" : "off";
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
if (!tmp) {
|
|
tmp = qdict_clone_shallow(src);
|
|
}
|
|
qdict_put_str(tmp, ent->key, s);
|
|
g_free(buf);
|
|
}
|
|
|
|
dst = qdict_crumple(tmp ?: src, errp);
|
|
qobject_unref(tmp);
|
|
return dst;
|
|
}
|
|
|
|
/**
|
|
* qdict_array_entries(): Returns the number of direct array entries if the
|
|
* sub-QDict of src specified by the prefix in subqdict (or src itself for
|
|
* prefix == "") is valid as an array, i.e. the length of the created list if
|
|
* the sub-QDict would become empty after calling qdict_array_split() on it. If
|
|
* the array is not valid, -EINVAL is returned.
|
|
*/
|
|
int qdict_array_entries(QDict *src, const char *subqdict)
|
|
{
|
|
const QDictEntry *entry;
|
|
unsigned i;
|
|
unsigned entries = 0;
|
|
size_t subqdict_len = strlen(subqdict);
|
|
|
|
assert(!subqdict_len || subqdict[subqdict_len - 1] == '.');
|
|
|
|
/* qdict_array_split() loops until UINT_MAX, but as we want to return
|
|
* negative errors, we only have a signed return value here. Any additional
|
|
* entries will lead to -EINVAL. */
|
|
for (i = 0; i < INT_MAX; i++) {
|
|
QObject *subqobj;
|
|
int subqdict_entries;
|
|
char *prefix = g_strdup_printf("%s%u.", subqdict, i);
|
|
|
|
subqdict_entries = qdict_count_prefixed_entries(src, prefix);
|
|
|
|
/* Remove ending "." */
|
|
prefix[strlen(prefix) - 1] = 0;
|
|
subqobj = qdict_get(src, prefix);
|
|
|
|
g_free(prefix);
|
|
|
|
if (subqdict_entries < 0) {
|
|
return subqdict_entries;
|
|
}
|
|
|
|
/* There may be either a single subordinate object (named "%u") or
|
|
* multiple objects (each with a key prefixed "%u."), but not both. */
|
|
if (subqobj && subqdict_entries) {
|
|
return -EINVAL;
|
|
} else if (!subqobj && !subqdict_entries) {
|
|
break;
|
|
}
|
|
|
|
entries += subqdict_entries ? subqdict_entries : 1;
|
|
}
|
|
|
|
/* Consider everything handled that isn't part of the given sub-QDict */
|
|
for (entry = qdict_first(src); entry; entry = qdict_next(src, entry)) {
|
|
if (!strstart(qdict_entry_key(entry), subqdict, NULL)) {
|
|
entries++;
|
|
}
|
|
}
|
|
|
|
/* Anything left in the sub-QDict that wasn't handled? */
|
|
if (qdict_size(src) != entries) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
/**
|
|
* qdict_join(): Absorb the src QDict into the dest QDict, that is, move all
|
|
* elements from src to dest.
|
|
*
|
|
* If an element from src has a key already present in dest, it will not be
|
|
* moved unless overwrite is true.
|
|
*
|
|
* If overwrite is true, the conflicting values in dest will be discarded and
|
|
* replaced by the corresponding values from src.
|
|
*
|
|
* Therefore, with overwrite being true, the src QDict will always be empty when
|
|
* this function returns. If overwrite is false, the src QDict will be empty
|
|
* iff there were no conflicts.
|
|
*/
|
|
void qdict_join(QDict *dest, QDict *src, bool overwrite)
|
|
{
|
|
const QDictEntry *entry, *next;
|
|
|
|
entry = qdict_first(src);
|
|
while (entry) {
|
|
next = qdict_next(src, entry);
|
|
|
|
if (overwrite || !qdict_haskey(dest, entry->key)) {
|
|
qdict_put_obj(dest, entry->key, qobject_ref(entry->value));
|
|
qdict_del(src, entry->key);
|
|
}
|
|
|
|
entry = next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qdict_rename_keys(): Rename keys in qdict according to the replacements
|
|
* specified in the array renames. The array must be terminated by an entry
|
|
* with from = NULL.
|
|
*
|
|
* The renames are performed individually in the order of the array, so entries
|
|
* may be renamed multiple times and may or may not conflict depending on the
|
|
* order of the renames array.
|
|
*
|
|
* Returns true for success, false in error cases.
|
|
*/
|
|
bool qdict_rename_keys(QDict *qdict, const QDictRenames *renames, Error **errp)
|
|
{
|
|
QObject *qobj;
|
|
|
|
while (renames->from) {
|
|
if (qdict_haskey(qdict, renames->from)) {
|
|
if (qdict_haskey(qdict, renames->to)) {
|
|
error_setg(errp, "'%s' and its alias '%s' can't be used at the "
|
|
"same time", renames->to, renames->from);
|
|
return false;
|
|
}
|
|
|
|
qobj = qdict_get(qdict, renames->from);
|
|
qdict_put_obj(qdict, renames->to, qobject_ref(qobj));
|
|
qdict_del(qdict, renames->from);
|
|
}
|
|
|
|
renames++;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Create a QObject input visitor for flat @qdict with possibly
|
|
* confused scalar types.
|
|
*
|
|
* The block subsystem uses this function to visit its flat QDict with
|
|
* possibly confused scalar types. It should not be used for anything
|
|
* else, and it should go away once the block subsystem has been
|
|
* cleaned up.
|
|
*/
|
|
Visitor *qobject_input_visitor_new_flat_confused(QDict *qdict,
|
|
Error **errp)
|
|
{
|
|
QObject *crumpled;
|
|
Visitor *v;
|
|
|
|
crumpled = qdict_crumple_for_keyval_qiv(qdict, errp);
|
|
if (!crumpled) {
|
|
return NULL;
|
|
}
|
|
|
|
v = qobject_input_visitor_new_keyval(crumpled);
|
|
qobject_unref(crumpled);
|
|
return v;
|
|
}
|