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.

Can anyone give me a clue about this? Is Printf.printf implemented in
pure OCaml, or does it require trickery in the compiler to work? The
code is scarily complex ...

Rich.

-- 
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