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(slib.info)String Ports

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String Ports
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  `(require 'string-port)'

 - Procedure: call-with-output-string proc
     PROC must be a procedure of one argument.  This procedure calls
     PROC with one argument: a (newly created) output port.  When the
     function returns, the string composed of the characters written
     into the port is returned.

 - Procedure: call-with-input-string string proc
     PROC must be a procedure of one argument.  This procedure calls
     PROC with one argument: an (newly created) input port from which
     STRING's contents may be read.  When PROC returns, the port is
     closed and the value yielded by the procedure PROC is returned.