Pull out parsing of ^C style strings from the terminal answerback code to

its own function, since I'll be wanting it for `terminal-modes'.

[originally from svn r5646]

misc.h

@@ -18,6 +18,7 @@ typedef struct Filename Filename;
 typedef struct FontSpec FontSpec;
 
 unsigned long parse_blocksize(const char *bs);
+char ctrlparse(char *s, char **next);
 
 char *dupstr(const char *s);
 char *dupcat(const char *s1, ...);