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Respecting line length limit in read-line.

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This commit is contained in:
Alex Shinn 2014-03-03 23:39:09 +09:00
parent a0854df2ca
commit c1a5bc9d43
2 changed files with 21 additions and 12 deletions
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26
lib/chibi/io/io.scm
View file

@ -71,23 +71,25 @@
((not string-streams)
(define (%read-line n in)
(let ((out (open-output-string)))
(let lp ()
(let ((ch (read-char in)))
(let lp ((i 0))
(let ((ch (peek-char in)))
(cond
((eof-object? ch)
(let ((res (get-output-string out)))
(and (not (equal? res "")) res)))
((eqv? ch #\newline)
(read-char in)
(get-output-string out))
((eqv? ch #\return)
(read-char in)
(if (eqv? #\newline (peek-char in))
(read-char in))
(get-output-string out))
((>= i n)
(get-output-string out))
(else
(write-char ch out)
(cond
((eqv? ch #\newline)
(get-output-string out))
((eqv? ch #\return)
(if (eqv? #\newline (peek-char in))
(read-char in))
(get-output-string out))
(else
(lp)))))))))))
(write-char (read-char in) out)
(lp (+ i 1))))))))))
(define (read-line . o)
(let ((in (if (pair? o) (car o) (current-input-port)))

7
tests/io-tests.scm
View file

@ -19,6 +19,13 @@
(call-with-input-string "abc\ndef\n"
(lambda (in) (let ((line (read-line in))) (list line (read-line in))))))
(test "read-line" '("abc" "def" "ghi")
(call-with-input-string "abcdef\nghi\n"
(lambda (in)
(let* ((line1 (read-line in 3))
(line2 (read-line in 3)))
(list line1 line2 (read-line in 3))))))
(test "read-line-to-eof" '("abc" "def")
(call-with-input-string "abc\ndef"
(lambda (in) (let ((line (read-line in))) (list line (read-line in))))))