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bus: also remove recursive invocation of message_append_ap()

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This commit is contained in:
Lennart Poettering
2013-04-09 21:28:11 +02:00
parent fe1d424d29
commit 1b492614cb
1 changed files with 110 additions and 66 deletions
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src/libsystemd-bus/bus-message.c
+110 -66
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@@ -1241,12 +1241,54 @@ int sd_bus_message_close_container(sd_bus_message *m) {
return 0;
}
typedef struct {
const char *types;
unsigned n_struct;
unsigned n_array;
} TypeStack;
static int type_stack_push(TypeStack *stack, unsigned max, unsigned *i, const char *types, unsigned n_struct, unsigned n_array) {
assert(stack);
assert(max > 0);
if (*i >= max)
return -EINVAL;
stack[*i].types = types;
stack[*i].n_struct = n_struct;
stack[*i].n_array = n_array;
(*i)++;
return 0;
}
static int type_stack_pop(TypeStack *stack, unsigned max, unsigned *i, const char **types, unsigned *n_struct, unsigned *n_array) {
assert(stack);
assert(max > 0);
assert(types);
assert(n_struct);
assert(n_array);
if (*i <= 0)
return 0;
(*i)--;
*types = stack[*i].types;
*n_struct = stack[*i].n_struct;
*n_array = stack[*i].n_array;
return 1;
}
int bus_message_append_ap(
sd_bus_message *m,
const char *types,
va_list ap) {
const char *t;
unsigned n_array, n_struct;
TypeStack stack[BUS_CONTAINER_DEPTH];
unsigned stack_ptr = 0;
int r;
assert(m);
@@ -1254,7 +1296,34 @@ int bus_message_append_ap(
if (!types)
return 0;
for (t = types; *t; t++) {
n_array = (unsigned) -1;
n_struct = strlen(types);
for (;;) {
const char *t;
if (n_array == 0 || (n_array == (unsigned) -1 && n_struct == 0)) {
r = type_stack_pop(stack, ELEMENTSOF(stack), &stack_ptr, &types, &n_struct, &n_array);
if (r < 0)
return r;
if (r == 0)
break;
r = sd_bus_message_close_container(m);
if (r < 0)
return r;
continue;
}
t = types;
if (n_array != (unsigned) -1)
n_array --;
else {
types ++;
n_struct--;
}
switch (*t) {
case SD_BUS_TYPE_BYTE: {
@@ -1316,27 +1385,28 @@ int bus_message_append_ap(
return r;
{
unsigned i, n;
char s[k + 1];
memcpy(s, t + 1, k);
s[k] = 0;
t += k;
r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, s);
if (r < 0)
return r;
n = va_arg(ap, unsigned);
for (i = 0; i < n; i++) {
r = bus_message_append_ap(m, s, ap);
if (r < 0)
return r;
}
r = sd_bus_message_close_container(m);
}
if (n_array == (unsigned) -1) {
types += k;
n_struct -= k;
}
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
types = t + 1;
n_struct = k;
n_array = va_arg(ap, unsigned);
break;
}
@@ -1351,11 +1421,14 @@ int bus_message_append_ap(
if (r < 0)
return r;
r = bus_message_append_ap(m, s, ap);
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
r = sd_bus_message_close_container(m);
types = s;
n_struct = strlen(s);
n_array = (unsigned) -1;
break;
}
@@ -1376,16 +1449,21 @@ int bus_message_append_ap(
r = sd_bus_message_open_container(m, *t == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
if (r < 0)
return r;
t += k - 1;
r = bus_message_append_ap(m, s, ap);
if (r < 0)
return r;
r = sd_bus_message_close_container(m);
}
if (n_array == (unsigned) -1) {
types += k - 1;
n_struct -= k - 1;
}
r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
if (r < 0)
return r;
types = t + 1;
n_struct = k - 2;
n_array = (unsigned) -1;
break;
}
@@ -2090,54 +2168,20 @@ int sd_bus_message_rewind(sd_bus_message *m, int complete) {
return !isempty(c->signature);
}
static int message_read_ap(
sd_bus_message *m,
const char *types,
va_list ap) {
typedef struct {
const char *types;
unsigned n_struct;
unsigned n_array;
} TypeStack;
static int type_stack_push(TypeStack *stack, unsigned max, unsigned *i, const char *types, unsigned n_struct, unsigned n_array) {
assert(stack);
assert(max > 0);
if (*i >= max)
return -EINVAL;
stack[*i].types = types;
stack[*i].n_struct = n_struct;
stack[*i].n_array = n_array;
(*i)++;
return 0;
}
static int type_stack_pop(TypeStack *stack, unsigned max, unsigned *i, const char **types, unsigned *n_struct, unsigned *n_array) {
assert(stack);
assert(max > 0);
assert(types);
assert(n_struct);
assert(n_array);
if (*i <= 0)
return 0;
(*i)--;
*types = stack[*i].types;
*n_struct = stack[*i].n_struct;
*n_array = stack[*i].n_array;
return 1;
}
static int message_read_ap(sd_bus_message *m, const char *types, va_list ap) {
unsigned n_array, n_struct;
TypeStack stack[BUS_CONTAINER_DEPTH];
unsigned stack_ptr = 0;
int r;
assert(m);
assert(types);
if (!types)
return 0;
/* Ideally, we'd just call ourselves recursively on every
* complex type. However, the state of a va_list that is
@@ -2152,7 +2196,7 @@ static int message_read_ap(sd_bus_message *m, const char *types, va_list ap) {
for (;;) {
const char *t;
if (n_array == 0 || (n_struct == 0 && n_array == (unsigned) -1)) {
if (n_array == 0 || (n_array == (unsigned) -1 && n_struct == 0)) {
r = type_stack_pop(stack, ELEMENTSOF(stack), &stack_ptr, &types, &n_struct, &n_array);
if (r < 0)
return r;