write-string; write-line - ANSI Common Lisp

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write-string, write-line (Function)

Syntax:

— Function: write-string string &optional output-stream &key start end → string

— Function: write-line string &optional output-stream &key start end → string

Arguments and Values:

string—a string.

output-stream—an output stream designator. The default is standard output.

start, end—bounding index designators of string. The defaults for start and end are 0 and nil, respectively.

Description:

write-string writes the characters of the subsequence of string bounded by start and end to output-stream. write-line does the same thing, but then outputs a newline afterwards.

Examples:

 (prog1 (write-string "books" nil :end 4) (write-string "worms"))
▷ bookworms
→ "books"
 (progn (write-char #\*)
        (write-line "test12" *standard-output* :end 5)
        (write-line "*test2")
        (write-char #\*)
        nil)
▷ *test1
▷ *test2
▷ *
→ NIL

Affected By:

*standard-output*, *terminal-io*.

Notes:

write-line and write-string return string, not the substring bounded by start and end.

 (write-string string)
≡ (dotimes (i (length string)
      (write-char (char string i)))

 (write-line string)
≡ (prog1 (write-string string) (terpri))