diff options
Diffstat (limited to 'dbus/dbus-signature.c')
| -rw-r--r-- | dbus/dbus-signature.c | 90 |
1 files changed, 58 insertions, 32 deletions
diff --git a/dbus/dbus-signature.c b/dbus/dbus-signature.c index 233310ed..c756f1c2 100644 --- a/dbus/dbus-signature.c +++ b/dbus/dbus-signature.c @@ -37,6 +37,14 @@ typedef struct unsigned int in_array : 1; /**< true if we are a subiterator pointing to an array's element type */ } DBusSignatureRealIter; +/** macro that checks whether a typecode is a container type */ +#define TYPE_IS_CONTAINER(typecode) \ + ((typecode) == DBUS_TYPE_STRUCT || \ + (typecode) == DBUS_TYPE_DICT_ENTRY || \ + (typecode) == DBUS_TYPE_VARIANT || \ + (typecode) == DBUS_TYPE_ARRAY) + + /** * @defgroup DBusSignature Type signature parsing * @ingroup DBus @@ -73,10 +81,10 @@ dbus_signature_iter_init (DBusSignatureIter *iter, * character such as '(' for a structure, the corresponding type for * the container will be returned, e.g. DBUS_TYPE_STRUCT, not '('. * In this case, you should initialize a sub-iterator with - * dbus_signature_iter_recurse to parse the container type. + * dbus_signature_iter_recurse() to parse the container type. * * @param iter pointer to an iterator - * @returns current type (e.g. DBUS_TYPE_STRING, DBUS_TYPE_ARRAY) + * @returns current type (e.g. #DBUS_TYPE_STRING, #DBUS_TYPE_ARRAY) */ int dbus_signature_iter_get_current_type (const DBusSignatureIter *iter) @@ -87,11 +95,16 @@ dbus_signature_iter_get_current_type (const DBusSignatureIter *iter) } /** - * Returns the full type signature represented by the current - * iterator as a C string. + * Returns the signature of the single complete type starting at the + * given iterator. + * + * For example, if the iterator is pointing at the start of "(ii)ii" + * (which is "a struct of two ints, followed by an int, followed by an + * int"), then "(ii)" would be returned. If the iterator is pointing at + * one of the "i" then just that "i" would be returned. * * @param iter pointer to an iterator - * @returns current signature; or NULL on OOM. Should be freed with #dbus_free + * @returns current signature; or #NULL if no memory. Should be freed with dbus_free() */ char * dbus_signature_iter_get_signature (const DBusSignatureIter *iter) @@ -121,8 +134,8 @@ dbus_signature_iter_get_signature (const DBusSignatureIter *iter) * This function allows you to avoid initializing a sub-iterator and * getting its current type. * - * It is an error to invoke this function if the current type of the - * iterator is not DBUS_TYPE_ARRAY. + * Undefined behavior results if you invoke this function when the + * current type of the iterator is not #DBUS_TYPE_ARRAY. * * @param iter pointer to an iterator * @returns current array element type @@ -139,7 +152,7 @@ dbus_signature_iter_get_element_type (const DBusSignatureIter *iter) /** * Skip to the next value on this "level". e.g. the next field in a - * struct, the next value in an array. Returns FALSE at the end of the + * struct, the next value in an array. Returns #FALSE at the end of the * current container. * * @param iter the iterator @@ -178,9 +191,12 @@ dbus_signature_iter_next (DBusSignatureIter *iter) } /** - * Initialize a new iterator pointing to the first type current - * container. It's an error to call this if the current type is a - * non-container (i.e. if dbus_type_is_container returns FALSE). + * Initialize a new iterator pointing to the first type in the current + * container. + * + * The results are undefined when calling this if the current type is + * a non-container (i.e. if dbus_type_is_container() returns #FALSE + * for the result of dbus_signature_iter_get_current_type()). * * @param iter the current interator * @param subiter an iterator to initialize pointing to the first child @@ -203,11 +219,13 @@ dbus_signature_iter_recurse (const DBusSignatureIter *iter, } /** - * Check a type signature for validity. + * Check a type signature for validity. Remember that #NULL can always + * be passed instead of a DBusError*, if you don't care about having + * an error name and message. * * @param signature a potentially invalid type signature * @param error error return - * @returns TRUE iif signature is valid + * @returns #TRUE if signature is valid or #FALSE if an error is set */ dbus_bool_t dbus_signature_validate (const char *signature, @@ -224,12 +242,15 @@ dbus_signature_validate (const char *signature, } /** - * Check that a type signature is both valid and contains exactly - * one complete type. + * Check that a type signature is both valid and contains exactly one + * complete type. "One complete type" means a single basic type, + * array, struct, or dictionary, though the struct or array may be + * arbitrarily recursive and complex. More than one complete type + * would mean for example "ii" or two integers in sequence. * * @param signature a potentially invalid type signature * @param error error return - * @returns TRUE iif signature is valid and has exactly one complete type + * @returns #TRUE if signature is valid and has exactly one complete type */ dbus_bool_t dbus_signature_validate_single (const char *signature, @@ -250,16 +271,10 @@ dbus_signature_validate_single (const char *signature, return FALSE; } -/** macro that checks whether a typecode is a container type */ -#define TYPE_IS_CONTAINER(typecode) \ - ((typecode) == DBUS_TYPE_STRUCT || \ - (typecode) == DBUS_TYPE_DICT_ENTRY || \ - (typecode) == DBUS_TYPE_VARIANT || \ - (typecode) == DBUS_TYPE_ARRAY) - /** * A "container type" can contain basic types, or nested * container types. #DBUS_TYPE_INVALID is not a container type. + * * This function will crash if passed a typecode that isn't * in dbus-protocol.h * @@ -275,15 +290,15 @@ dbus_type_is_container (int typecode) } /** - * A "basic type" is a somewhat arbitrary concept, but the intent - * is to include those types that are fully-specified by a single - * typecode, with no additional type information or nested - * values. So all numbers and strings are basic types and - * structs, arrays, and variants are not basic types. - * #DBUS_TYPE_INVALID is not a basic type. + * A "basic type" is a somewhat arbitrary concept, but the intent is + * to include those types that are fully-specified by a single + * typecode, with no additional type information or nested values. So + * all numbers and strings are basic types and structs, arrays, and + * variants are not basic types. #DBUS_TYPE_INVALID is not a basic + * type. * * This function will crash if passed a typecode that isn't - * in dbus-protocol.h + * in dbus-protocol.h * * @returns #TRUE if type is basic */ @@ -304,14 +319,25 @@ dbus_type_is_basic (int typecode) * first byte of the old and new value would be in the same location, * so alignment padding is not a factor. * - * This function is useful to determine whether #dbus_message_iter_get_fixed_array - * may be used. + * This function is useful to determine whether + * dbus_message_iter_get_fixed_array() may be used. + * + * Some structs are fixed-size (if they contain only fixed-size types) + * but struct is not considered a fixed type for purposes of this + * function. * + * This function will crash if passed a typecode that isn't + * in dbus-protocol.h + * * @returns #FALSE if the type can occupy different lengths */ dbus_bool_t dbus_type_is_fixed (int typecode) { + /* only reasonable (non-line-noise) typecodes are allowed */ + _dbus_return_val_if_fail (_dbus_type_is_valid (typecode) || typecode == DBUS_TYPE_INVALID, + FALSE); + switch (typecode) { case DBUS_TYPE_BYTE: |