ObjFW  Check-in [43b963aba6]

	char *t;

	if (fmt == NULL)
		@throw [OFInvalidFormatException newWithClass: isa];

	if ((vasprintf(&t, [fmt cString], args)) == -1)
		/*
		 * This is only the most likely error to happen.
		 * This is only the most likely error to happen. Unfortunately,
		 * Unfortunately, as errno isn't always thread-safe, there's
		 * no good way for us to find out what really happened.
		 * there is no good way to check what really happened.
		 */
		@throw [OFOutOfMemoryException newWithClass: isa];

	@try {
		[self appendCString: t];
	} @finally {
		free(t);

		[super dealloc];
		@throw [OFInvalidFormatException newWithClass: c];
	}

	if ((t = vasprintf(&string, [fmt cString], args)) == -1) {
		c = isa;
		[super dealloc];

		/*
		 * This is only the most likely error to happen. Unfortunately,
		 * there is no good way to check what really happened.
		 */
		@throw [OFInitializationFailedException newWithClass: c];
		@throw [OFOutOfMemoryException newWithClass: c];
	}
	length = t;

	switch (of_string_check_utf8(string, length)) {
		case 1:
			is_utf8 = YES;
			break;