116 lines
3.8 KiB
Scheme
116 lines
3.8 KiB
Scheme
;;; Ikarus Scheme -- A compiler for R6RS Scheme.
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;;; Copyright (C) 2006,2007 Abdulaziz Ghuloum
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;;;
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;;; This program is free software: you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License version 3 as
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;;; published by the Free Software Foundation.
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;;;
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;;; This program is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(library (ikarus io-primitives unsafe)
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(export $write-char $write-byte $read-char $unread-char $peek-char
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$reset-input-port! $flush-output-port
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$close-input-port $close-output-port)
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(import
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(ikarus)
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(ikarus system $ports)
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(ikarus system $strings)
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(ikarus system $chars)
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(ikarus system $bytevectors)
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(ikarus system $fx))
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(define $write-char
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(lambda (c p)
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(let ([b ($char->fixnum c)])
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(cond
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[($fx<= b #x7F)
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($write-byte b p)]
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[($fx<= b #x7FF)
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($write-byte
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($fxlogor #b11000000 ($fxsra b 6)) p)
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($write-byte
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($fxlogor #b10000000 ($fxlogand b #b111111)) p)]
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[($fx<= b #xFFFF)
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($write-byte
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($fxlogor #b11100000 ($fxsra b 12)) p)
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($write-byte
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($fxlogor #b10000000 ($fxlogand ($fxsra b 6) #b111111)) p)
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($write-byte
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($fxlogor #b10000000 ($fxlogand b #b111111)) p)]
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[else
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($write-byte
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($fxlogor #b11110000 ($fxsra b 18)) p)
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($write-byte
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($fxlogor #b10000000 ($fxlogand ($fxsra b 12) #b111111)) p)
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($write-byte
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($fxlogor #b10000000 ($fxlogand ($fxsra b 6) #b111111)) p)
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($write-byte
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($fxlogor #b10000000 ($fxlogand b #b111111)) p)]))))
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(define $write-byte
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(lambda (b p)
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(let ([idx (port-output-index p)])
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(if ($fx< idx ($port-size p))
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(begin
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($bytevector-set! ($port-buffer p) idx b)
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($set-port-index! p ($fxadd1 idx)))
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(($port-handler p) 'write-byte b p)))))
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(define $read-char
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(lambda (p)
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(let ([idx ($port-index p)])
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(if ($fx< idx ($port-size p))
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(let ([b ($bytevector-u8-ref ($port-buffer p) idx)])
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(cond
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[($fx<= b 127)
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($set-port-index! p ($fxadd1 idx))
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($fixnum->char b)]
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[else (($port-handler p) 'read-char p)]))
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(($port-handler p) 'read-char p)))))
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(define $peek-char
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(lambda (p)
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(let ([idx ($port-index p)])
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(if ($fx< idx ($port-size p))
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(let ([b ($bytevector-u8-ref ($port-buffer p) idx)])
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(cond
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[($fx<= b 127)
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($fixnum->char b)]
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[else (($port-handler p) 'peek-char p)]))
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(($port-handler p) 'peek-char p)))))
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(define $unread-char
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(lambda (c p)
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(let ([idx ($fxsub1 ($port-index p))]
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[b ($char->fixnum c)])
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(if (and ($fx<= b 127)
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($fx>= idx 0)
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($fx< idx ($port-size p)))
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(begin
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($set-port-index! p idx)
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($bytevector-set! ($port-buffer p) idx b))
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(($port-handler p) 'unread-char c p)))))
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(define $reset-input-port!
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(lambda (p)
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($set-port-size! p 0)))
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(define $close-input-port
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(lambda (p)
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(($port-handler p) 'close-port p)))
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(define $close-output-port
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(lambda (p)
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(($port-handler p) 'close-port p)))
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(define $flush-output-port
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(lambda (p)
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(($port-handler p) 'flush-output-port p))))
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