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;;;; textual-ports.scm --- Textual I/O on ports
;;;; Copyright (C) 2016 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;; Commentary:
;;;
;;; Code:
(define-module (ice-9 textual-ports)
#:use-module (ice-9 ports internal)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 rdelim)
#:re-export (get-string-n!
put-char
put-string)
#:export (get-char
unget-char
unget-string
lookahead-char
get-string-n
get-string-all
get-line))
(define (get-char port)
(read-char port))
(define (lookahead-char port)
(peek-char port))
(define (unget-char port char)
(unread-char char port))
(define* (unget-string port string #:optional (start 0)
(count (- (string-length string) start)))
(unread-string (if (and (zero? start)
(= count (string-length string)))
string
(substring/shared string start (+ start count)))
port))
(define (get-line port)
(read-line port 'trim))
(define (get-string-all port)
(read-string port))
(define (get-string-n port count)
"Read up to @var{count} characters from @var{port}.
If no characters could be read before encountering the end of file,
return the end-of-file object, otherwise return a string containing
the characters read."
(let* ((s (make-string count))
(rv (get-string-n! port s 0 count)))
(cond ((eof-object? rv) rv)
((= rv count) s)
(else (substring/shared s 0 rv)))))