Richard Jones [Friday 26 September 2003] :
 >
 > I want to write a function which is a bit like Printf.printf, but
 > handles the %s placeholder differently. It needs to do SQL-style
 > escaping, eg:
 > 
 > 	my_printf "The string: %s" "string with 'quotes'"
 > 
 > would return the string:
 > 
 > 	The string: 'string with ''quotes'''
 > 
 > (hope I've got that right ...)
 > 
 > Anyway, it looks like this should be possible, and possibly even quite
 > simple, with a custom formatter.

You could use the %a format. See the Prinf module documentation : 

   * `a': user-defined printer. Takes two arguments and apply the first
     one to `outchan' (the current output channel) and to the second
     argument. The first argument must therefore have type `out_channel
     -> 'b -> unit' and the second `'b'.  The output produced by the
     function is therefore inserted in the output of `fprintf' at the
     current point.

(that's for fprintf, for sprintf the printer would be of type 
 `unit -> 'b -> string')

-- 
   Olivier

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