c-lineup-string-cont is a compiled Lisp function in `cc-align.el'.

(c-lineup-string-cont LANGELEM)

Line up a continued string under the one it continues.
A continued string in this sense is where a string literal follows
directly after another one. E.g.:

result = prefix + "A message "
"string."; <- c-lineup-string-cont

In other situations, returns nil, to allow stacking with other
line-up functions.

Works with: topmost-intro-cont, statement-cont, arglist-cont,