write-to-string, prin1-to-string, princ-to-string

array - a generalized boolean.

base - a radix.

case - a symbol of type (member :upcase :downcase :capitalize).

circle - a generalized boolean.

escape - a generalized boolean.

gensym - a generalized boolean.

length - a non-negative integer, or nil.

level - a non-negative integer, or nil.

lines - a non-negative integer, or nil.

miser-width - a non-negative integer, or nil.

pprint-dispatch - a pprint dispatch table.

pretty - a generalized boolean.

radix - a generalized boolean.

readably - a generalized boolean.

right-margin - a non-negative integer, or nil.

string - a string.

write-to-string is the general output function. It has the ability to specify all the parameters applicable to the printing of object.

prin1-to-string acts like write-to-string with :escape t, that is, escape characters are written where appropriate.

princ-to-string acts like write-to-string with :escape nil :readably nil. Thus no escape characters are written.

All other keywords that would be specified to write-to-string are default values when prin1-to-string or princ-to-string is invoked.

The meanings and defaults for the keyword arguments to write-to-string are the same as those for write.

 (prin1-to-string "abc") "\"abc\""
 (princ-to-string "abc") "abc"

 (write-to-string object {key argument}*)
==(with-output-to-string (#1=#:string-stream) 
 (write object :stream #1# {key argument}*))
 (princ-to-string object)
==(with-output-to-string (string-stream)
 (princ object string-stream))
 (prin1-to-string object)
==(with-output-to-string (string-stream)
 (prin1 object string-stream))