ikarus/scheme/ikarus.io-primitives.ss

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;;; Ikarus Scheme -- A compiler for R6RS Scheme.
;;; Copyright (C) 2006,2007 Abdulaziz Ghuloum
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License version 3 as
;;; published by the Free Software Foundation.
;;;
;;; This program 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
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(library (ikarus io-primitives)
(export read-char unread-char peek-char write-char write-byte
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put-u8 put-char put-string put-bytevector
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get-char get-u8
get-string-n get-string-n!
get-bytevector-n get-bytevector-n!
newline port-name input-port-name output-port-name
close-input-port reset-input-port! close-port
flush-output-port close-output-port get-line)
(import
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(ikarus system $io)
(ikarus system $fx)
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(ikarus system $ports)
(except (ikarus) read-char unread-char peek-char write-char write-byte
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put-u8 put-char put-string put-bytevector
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get-char get-u8
get-string-n get-string-n!
get-bytevector-n get-bytevector-n!
newline port-name input-port-name output-port-name
close-input-port reset-input-port! flush-output-port
close-output-port close-port get-line))
(define write-char
(case-lambda
[(c)
(if (char? c)
($write-char c (current-output-port))
(error 'write-char "not a character" c))]
[(c p)
(if (char? c)
(if (output-port? p)
($write-char c p)
(error 'write-char "not an output-port" p))
(error 'write-char "not a character" c))]))
(define put-char
(lambda (p c)
(if (char? c)
(if (output-port? p)
($write-char c p)
(error 'put-char "not an output-port" p))
(error 'put-char "not a character" c))))
(define write-byte
(case-lambda
[(b)
(if (and (fixnum? b) ($fx<= 0 b) ($fx<= b 255))
($write-byte b (current-output-port))
(error 'write-byte "not a byte" b))]
[(b p)
(if (and (fixnum? b) ($fx<= 0 b) ($fx<= b 255))
(if (output-port? p)
($write-byte b p)
(error 'write-byte "not an output-port" p))
(error 'write-byte "not a byte" b))]))
(define put-u8
(lambda (p b)
(if (and (fixnum? b) ($fx<= 0 b) ($fx<= b 255))
(if (output-port? p)
($write-byte b p)
(error 'put-u8 "not an output-port" p))
(error 'put-u8 "not a u8" b))))
;;;
(define newline
(case-lambda
[()
($write-char #\newline (current-output-port))
($flush-output-port (current-output-port))]
[(p)
(if (output-port? p)
(begin
($write-char #\newline p)
($flush-output-port p))
(error 'newline "not an output port" p))]))
;;;
(define port-name
(lambda (p)
(if (port? p)
(($port-handler p) 'port-name p)
(error 'port-name "not a port" p))))
(define input-port-name
(lambda (p)
(if (port? p)
(($port-handler p) 'port-name p)
(error 'input-port-name "not a port" p))))
(define output-port-name
(lambda (p)
(if (port? p)
(($port-handler p) 'port-name p)
(error 'output-port-name "not a port" p))))
(define get-char
(lambda (p)
(if (input-port? p)
($read-char p)
(error 'get-char "not an input-port" p))))
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(define get-u8
(lambda (p)
(if (input-port? p)
($get-u8 p)
(error 'get-u8 "not an input-port" p))))
(define read-char
(case-lambda
[() ($read-char (current-input-port))]
[(p)
(if (input-port? p)
($read-char p)
(error 'read-char "not an input-port" p))]))
;;;
(define unread-char
(case-lambda
[(c) (if (char? c)
($unread-char c (current-input-port))
(error 'unread-char "not a character" c))]
[(c p)
(if (input-port? p)
(if (char? c)
($unread-char c p)
(error 'unread-char "not a character" c))
(error 'unread-char "not an input-port" p))]))
;;;
(define peek-char
(case-lambda
[() ($peek-char (current-input-port))]
[(p)
(if (input-port? p)
($peek-char p)
(error 'peek-char "not an input-port" p))]))
;;;
(define reset-input-port!
(case-lambda
[() ($reset-input-port! (current-input-port))]
[(p)
(if (input-port? p)
($reset-input-port! p)
(error 'reset-input-port! "not an input-port" p))]))
;;;
(define close-input-port
(case-lambda
[() ($close-input-port (current-input-port))]
[(p)
(if (input-port? p)
($close-input-port p)
(error 'close-input-port! "not an input-port" p))]))
;;;
(define close-output-port
(case-lambda
[() ($close-output-port (current-output-port))]
[(p)
(if (output-port? p)
($close-output-port p)
(error 'close-output-port "not an output-port" p))]))
;;;
(define (close-port p)
(cond
[(input-port? p) ($close-input-port p)]
[(output-port? p) ($close-output-port p)]
[else (error 'close-port "not a port" p)]))
;;;
(define flush-output-port
(case-lambda
[() ($flush-output-port (current-output-port))]
[(p)
(if (output-port? p)
($flush-output-port p)
(error 'flush-output-port "not an output-port" p))]))
(define (get-line p)
(define (get-it p)
(let f ([p p] [n 0] [ac '()])
(let ([x ($read-char p)])
(cond
[(eqv? x #\newline)
(make-it n ac)]
[(eof-object? x)
(if (null? ac) x (make-it n ac))]
[else (f p (+ n 1) (cons x ac))]))))
(define (make-it n revls)
(let f ([s (make-string n)] [i (- n 1)] [ls revls])
(cond
[(pair? ls)
(string-set! s i (car ls))
(f s (- i 1) (cdr ls))]
[else s])))
(if (input-port? p)
(get-it p)
(error 'get-line "not an input port" p)))
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(module (put-string)
(import (ikarus system $strings)
(ikarus system $fx))
(define ($put-string p s i j)
(unless ($fx= i j)
($write-char ($string-ref s i) p)
($put-string p s ($fx+ i 1) j)))
(define put-string
(case-lambda
[(p s)
(unless (output-port? p)
(error 'put-string "not an output port" p))
(unless (string? s)
(error 'put-string "not a string" s))
($put-string p s 0 (string-length s))]
[(p s i)
(unless (output-port? p)
(error 'put-string "not an output port" p))
(unless (string? s)
(error 'put-string "not a string" s))
(let ([len ($string-length s)])
(unless (fixnum? i)
(error 'put-string "starting index is not a fixnum" i))
(when (or ($fx< i 0) ($fx> i len))
(error 'put-string
(format "starting index is out of range 0..~a" len)
i))
($put-string p s i len))]
[(p s i c)
(unless (output-port? p)
(error 'put-string "not an output port" p))
(unless (string? s)
(error 'put-string "not a string" s))
(let ([len ($string-length s)])
(unless (fixnum? i)
(error 'put-string "starting index is not a fixnum" i))
(when (or ($fx< i 0) ($fx> i len))
(error 'put-string
(format "starting index is out of range 0..~a" len)
i))
(unless (fixnum? c)
(error 'put-string "count is not a fixnum" c))
(let ([j (+ i c)])
(when (or ($fx< c 0) (> j len))
(error 'put-string
(format "count is out of range 0..~a" (- len i))
c))
($put-string p s i j)))])))
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(module (put-bytevector)
(import (ikarus system $bytevectors)
(ikarus system $fx))
(define ($put-bytevector p bv i j)
(unless ($fx= i j)
($write-byte ($bytevector-u8-ref bv i) p)
($put-bytevector p bv ($fx+ i 1) j)))
(define put-bytevector
(case-lambda
[(p s)
(unless (output-port? p)
(error 'put-bytevector "not an output port" p))
(unless (bytevector? s)
(error 'put-bytevector "not a bytevector" s))
($put-bytevector p s 0 (bytevector-length s))]
[(p s i)
(unless (output-port? p)
(error 'put-bytevector "not an output port" p))
(unless (bytevector? s)
(error 'put-bytevector "not a bytevector" s))
(let ([len ($bytevector-length s)])
(unless (fixnum? i)
(error 'put-bytevector "starting index is not a fixnum" i))
(when (or ($fx< i 0) ($fx> i len))
(error 'put-bytevector
(format "starting index is out of range 0..~a" len)
i))
($put-bytevector p s i len))]
[(p s i c)
(unless (output-port? p)
(error 'put-bytevector "not an output port" p))
(unless (bytevector? s)
(error 'put-bytevector "not a bytevector" s))
(let ([len ($bytevector-length s)])
(unless (fixnum? i)
(error 'put-bytevector "starting index is not a fixnum" i))
(when (or ($fx< i 0) ($fx> i len))
(error 'put-bytevector
(format "starting index is out of range 0..~a" len)
i))
(unless (fixnum? c)
(error 'put-bytevector "count is not a fixnum" c))
(let ([j (+ i c)])
(when (or ($fx< c 0) (> j len))
(error 'put-bytevector
(format "count is out of range 0..~a" (- len i))
c))
($put-bytevector p s i j)))])))
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(define (get-string-n p n)
(import (ikarus system $fx) (ikarus system $strings))
(unless (input-port? p)
(error 'get-string-n "not an input port" p))
(unless (fixnum? n)
(error 'get-string-n "count is not a fixnum" n))
(cond
[($fx> n 0)
(let ([s ($make-string n)])
(let f ([p p] [n n] [s s] [i 0])
(let ([x ($read-char p)])
(cond
[(eof-object? x)
(if ($fx= i 0)
(eof-object)
(substring s 0 i))]
[else
($string-set! s i x)
(let ([i ($fxadd1 i)])
(if ($fx= i n)
s
(f p n s i)))]))))]
[($fx= n 0) ""]
[else (error 'get-string-n "count is negative" n)]))
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(define (get-string-n! p s i c)
(import (ikarus system $fx) (ikarus system $strings))
(unless (input-port? p)
(error 'get-string-n! "not an input port" p))
(unless (string? s)
(error 'get-string-n! "not a string" s))
(let ([len ($string-length s)])
(unless (fixnum? i)
(error 'get-string-n! "starting index is not a fixnum" i))
(when (or ($fx< i 0) ($fx> i len))
(error 'get-string-n!
(format "starting index is out of range 0..~a" len)
i))
(unless (fixnum? c)
(error 'get-string-n! "count is not a fixnum" c))
(cond
[($fx> c 0)
(let ([j (+ i c)])
(when (> j len)
(error 'get-string-n!
(format "count is out of range 0..~a" (- len i))
c))
(let ([x ($read-char p)])
(cond
[(eof-object? x) x]
[else
($string-set! s i x)
(let f ([p p] [s s] [start i] [i 1] [c c])
(let ([x ($read-char p)])
(cond
[(eof-object? x) i]
[else
($string-set! s ($fx+ start i) x)
(let ([i ($fxadd1 i)])
(if ($fx= i c)
i
(f p s start i c)))])))])))]
[($fx= c 0) 0]
[else (error 'get-string-n! "count is negative" c)])))
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(define (get-bytevector-n p n)
(import (ikarus system $fx) (ikarus system $bytevectors))
(define (subbytevector s n)
(let ([p ($make-bytevector n)])
(let f ([s s] [n n] [p p])
(let ([n ($fx- n 1)])
($bytevector-set! p n ($bytevector-u8-ref s n))
(if ($fx= n 0)
p
(f s n p))))))
(unless (input-port? p)
(error 'get-bytevector-n "not an input port" p))
(unless (fixnum? n)
(error 'get-bytevector-n "count is not a fixnum" n))
(cond
[($fx> n 0)
(let ([s ($make-bytevector n)])
(let f ([p p] [n n] [s s] [i 0])
(let ([x ($get-u8 p)])
(cond
[(eof-object? x)
(if ($fx= i 0)
(eof-object)
(subbytevector s i))]
[else
($bytevector-set! s i x)
(let ([i ($fxadd1 i)])
(if ($fx= i n)
s
(f p n s i)))]))))]
[($fx= n 0) '#vu8()]
[else (error 'get-bytevector-n "count is negative" n)]))
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(define (get-bytevector-n! p s i c)
(import (ikarus system $fx) (ikarus system $bytevectors))
(unless (input-port? p)
(error 'get-bytevector-n! "not an input port" p))
(unless (bytevector? s)
(error 'get-bytevector-n! "not a bytevector" s))
(let ([len ($bytevector-length s)])
(unless (fixnum? i)
(error 'get-bytevector-n! "starting index is not a fixnum" i))
(when (or ($fx< i 0) ($fx> i len))
(error 'get-bytevector-n!
(format "starting index is out of range 0..~a" len)
i))
(unless (fixnum? c)
(error 'get-bytevector-n! "count is not a fixnum" c))
(cond
[($fx> c 0)
(let ([j (+ i c)])
(when (> j len)
(error 'get-bytevector-n!
(format "count is out of range 0..~a" (- len i))
c))
(let ([x ($get-u8 p)])
(cond
[(eof-object? x) x]
[else
($bytevector-set! s i x)
(let f ([p p] [s s] [start i] [i 1] [c c])
(let ([x ($get-u8 p)])
(cond
[(eof-object? x) i]
[else
($bytevector-set! s ($fx+ start i) x)
(let ([i ($fxadd1 i)])
(if ($fx= i c)
i
(f p s start i c)))])))])))]
[($fx= c 0) 0]
[else (error 'get-bytevector-n! "count is negative" c)])))
)