int bus_gvariant_is_fixed_size(const char *signature) {
const char *p;
int r;
assert(signature);
p = signature;
while (*p != 0) {
size_t n;
r = signature_element_length(p, &n);
if (r < 0)
return r;
switch (*p) {
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH:
case SD_BUS_TYPE_SIGNATURE:
case SD_BUS_TYPE_ARRAY:
case SD_BUS_TYPE_VARIANT:
return 0;
case SD_BUS_TYPE_BYTE:
case SD_BUS_TYPE_BOOLEAN:
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16:
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
case SD_BUS_TYPE_UNIX_FD:
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64:
case SD_BUS_TYPE_DOUBLE:
break;
case SD_BUS_TYPE_STRUCT_BEGIN:
case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
char t[n-1];
memcpy(t, p + 1, n - 2);
t[n - 2] = 0;
r = bus_gvariant_is_fixed_size(t);
if (r <= 0)
return r;
break;
}
default:
assert_not_reached("Unknown signature type");
}
p += n;
}
return true;
}
bool signature_is_single(const char *s) {
int r;
size_t t;
assert(s);
r = signature_element_length(s, &t);
if (r < 0)
return false;
return s[t] == 0;
}
static int introspect_write_arguments(struct introspect *i, const char *signature, const char *direction) {
int r;
for (;;) {
size_t l;
if (!*signature)
return 0;
r = signature_element_length(signature, &l);
if (r < 0)
return r;
fprintf(i->f, " <arg type=\"%.*s\"", (int) l, signature);
if (direction)
fprintf(i->f, " direction=\"%s\"/>\n", direction);
else
fputs("/>\n", i->f);
signature += l;
}
}
int bus_gvariant_get_size(const char *signature) {
const char *p;
int sum = 0, r;
/* For fixed size structs. Fails for variable size structs. */
p = signature;
while (*p != 0) {
size_t n;
r = signature_element_length(p, &n);
if (r < 0)
return r;
else {
char t[n+1];
memcpy(t, p, n);
t[n] = 0;
r = bus_gvariant_get_alignment(t);
if (r < 0)
return r;
sum = ALIGN_TO(sum, r);
}
switch (*p) {
case SD_BUS_TYPE_BOOLEAN:
case SD_BUS_TYPE_BYTE:
sum += 1;
break;
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16:
sum += 2;
break;
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
case SD_BUS_TYPE_UNIX_FD:
sum += 4;
break;
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64:
case SD_BUS_TYPE_DOUBLE:
sum += 8;
break;
case SD_BUS_TYPE_STRUCT_BEGIN:
case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
char t[n-1];
memcpy(t, p + 1, n - 2);
t[n - 2] = 0;
r = bus_gvariant_get_size(t);
if (r < 0)
return r;
sum += r;
break;
}
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH:
case SD_BUS_TYPE_SIGNATURE:
case SD_BUS_TYPE_ARRAY:
case SD_BUS_TYPE_VARIANT:
return -EINVAL;
default:
assert_not_reached("Unknown signature type");
}
p += n;
}
r = bus_gvariant_get_alignment(signature);
if (r < 0)
return r;
return ALIGN_TO(sum, r);
}
int bus_gvariant_get_alignment(const char *signature) {
size_t alignment = 1;
const char *p;
int r;
p = signature;
while (*p != 0 && alignment < 8) {
size_t n;
int a;
r = signature_element_length(p, &n);
if (r < 0)
return r;
switch (*p) {
case SD_BUS_TYPE_BYTE:
case SD_BUS_TYPE_BOOLEAN:
case SD_BUS_TYPE_STRING:
case SD_BUS_TYPE_OBJECT_PATH:
case SD_BUS_TYPE_SIGNATURE:
a = 1;
break;
case SD_BUS_TYPE_INT16:
case SD_BUS_TYPE_UINT16:
a = 2;
break;
case SD_BUS_TYPE_INT32:
case SD_BUS_TYPE_UINT32:
case SD_BUS_TYPE_UNIX_FD:
a = 4;
break;
case SD_BUS_TYPE_INT64:
case SD_BUS_TYPE_UINT64:
case SD_BUS_TYPE_DOUBLE:
case SD_BUS_TYPE_VARIANT:
a = 8;
break;
case SD_BUS_TYPE_ARRAY: {
char t[n];
memcpy(t, p + 1, n - 1);
t[n - 1] = 0;
a = bus_gvariant_get_alignment(t);
break;
}
case SD_BUS_TYPE_STRUCT_BEGIN:
case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
char t[n-1];
memcpy(t, p + 1, n - 2);
t[n - 2] = 0;
a = bus_gvariant_get_alignment(t);
break;
}
default:
assert_not_reached("Unknown signature type");
}
if (a < 0)
return a;
assert(a > 0 && a <= 8);
if ((size_t) a > alignment)
alignment = (size_t) a;
p += n;
}
return alignment;
}
