2003-02-26 Havoc Pennington <hp@redhat.com>

2003-02-26  Havoc Pennington  <hp@redhat.com>

        All kinds of audit fixes from Owen, plus initial attempt to
	handle unaligned memory returned from malloc.

	* dbus/dbus-string.c (_dbus_string_init): clamp max length to
	leave room for align_offset and nul byte
	(fixup_alignment): function to track an align_offset and
	ensure real->str is aligned
	(DBUS_GENERIC_STRING_PREAMBLE): len must be less than allocated,
	to allow a nul byte plus align offset
	(_dbus_string_lock): fix overflow issue
	(_dbus_string_init_const_len): add assertions on sanity of len,
	assign allocated to be ALLOCATION_PADDING larger than len
	(set_length): fixup the overflow handling
	(_dbus_string_get_data_len): fix overflow in assertion
	(open_gap): detect overflow in size of gap to be opened
	(_dbus_string_lengthen): add overflow check
	(_dbus_string_align_length): fix overflow with _DBUS_ALIGN_VALUE
	(_dbus_string_append): add overflow check
	(_dbus_string_append_unichar): overflow
	(_dbus_string_delete): fix overflow in assertion
	(_dbus_string_copy_len): overflow in assertion
	(_dbus_string_replace_len): overflows in assertions
	(_dbus_string_find): change to implement in terms of
	_dbus_string_find_to
	(_dbus_string_find_to): assorted fixage
	(_dbus_string_equal_c_str): assert c_str != NULL,
	fix logic so the function works
	(_dbus_string_ends_with_c_str): fix overflow thingy
	(_dbus_string_base64_encode): overflow fix
	(_dbus_string_validate_ascii): overflow
	(_dbus_string_validate_nul): overflow