~ chicken-core (master) /port.scm

  1;;; port.scm - Optional non-standard ports
  2;
  3; Copyright (c) 2008-2022, The CHICKEN Team
  4; Copyright (c) 2000-2007, Felix L. Winkelmann
  5; All rights reserved.
  6;
  7; Redistribution and use in source and binary forms, with or without
  8; modification, are permitted provided that the following conditions
  9; are met:
 10;
 11;   Redistributions of source code must retain the above copyright
 12;   notice, this list of conditions and the following disclaimer.
 13;   Redistributions in binary form must reproduce the above copyright
 14;   notice, this list of conditions and the following disclaimer in
 15;   the documentation and/or other materials provided with the
 16;   distribution.
 17;   Neither the name of the author nor the names of its contributors
 18;   may be used to endorse or promote products derived from this
 19;   software without specific prior written permission.
 20;
 21; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 22; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 23; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 24; FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 25; COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 26; INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 27; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 28; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 29; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 30; STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 31; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 32; OF THE POSSIBILITY OF SUCH DAMAGE.
 33
 34
 35(declare
 36  (unit port)
 37  (uses extras))
 38
 39(module chicken.port
 40  (call-with-input-string
 41   call-with-output-string
 42   copy-port
 43   make-input-port
 44   make-output-port
 45   port-encoding
 46   port-fold
 47   port-for-each
 48   port-map
 49   port-name
 50   port-position
 51   make-bidirectional-port
 52   make-broadcast-port
 53   make-concatenated-port
 54   set-buffering-mode!
 55   terminal-name
 56   terminal-port?
 57   terminal-size
 58   with-error-output-to-port
 59   with-input-from-port
 60   with-input-from-string
 61   with-output-to-port
 62   with-output-to-string
 63   with-error-output-to-string)
 64
 65(import scheme
 66	chicken.base
 67	chicken.fixnum
 68	chicken.foreign
 69	chicken.io)
 70(import (only (scheme base) open-output-string get-output-string open-input-string))
 71
 72(include "common-declarations.scm")
 73
 74#>
 75
 76#if !defined(_WIN32)
 77# include <sys/ioctl.h>
 78# include <termios.h>
 79#endif
 80
 81#if !defined(__ANDROID__) && defined(TIOCGWINSZ)
 82static int get_tty_size(int fd, int *rows, int *cols)
 83{
 84  struct winsize tty_size;
 85  int r;
 86
 87  memset(&tty_size, 0, sizeof tty_size);
 88
 89  r = ioctl(fd, TIOCGWINSZ, &tty_size);
 90  if (r == 0) {
 91     *rows = tty_size.ws_row;
 92     *cols = tty_size.ws_col;
 93  }
 94  return r;
 95}
 96#else
 97static int get_tty_size(int fd, int *rows, int *cols)
 98{
 99  *rows = *cols = 0;
100  errno = ENOSYS;
101  return -1;
102}
103#endif
104
105#if defined(_WIN32) && !defined(__CYGWIN__)
106char *ttyname(int fd) {
107  errno = ENOSYS;
108  return NULL;
109}
110#endif
111
112<#
113
114
115(define-foreign-variable _iofbf int "_IOFBF")
116(define-foreign-variable _iolbf int "_IOLBF")
117(define-foreign-variable _ionbf int "_IONBF")
118(define-foreign-variable _bufsiz int "BUFSIZ")
119
120(define port-encoding
121  (getter-with-setter
122    (lambda (port)
123      (##sys#check-port port 'port-encoding)
124      (##sys#slot port 15))
125    (lambda (port enc)
126      (##sys#check-port port 'port-encoding)
127      (##sys#check-symbol enc 'port-encoding)
128      (##sys#setslot port 15 enc))
129    "(chicken.port#port-encoding port)"))
130
131(define port-name
132  (getter-with-setter
133    (lambda (#!optional (port ##sys#standard-input))
134      (##sys#check-port port 'port-name)
135      (##sys#slot port 3))
136    (lambda (port name)
137      (##sys#check-port port 'set-port-name!)
138      (##sys#check-string name 'set-port-name!)
139      (##sys#setslot port 3 name))
140    "(chicken.port#port-name port)"))
141
142(define (port-position #!optional (port ##sys#standard-input))
143  (##sys#check-port port 'port-position)
144  (if (##core#inline "C_input_portp" port)
145      (##sys#values (##sys#slot port 4) (##sys#slot port 5))
146      (##sys#error 'port-position "cannot compute position of port" port)))
147
148(define (set-buffering-mode! port mode . size)
149  (##sys#check-port port 'set-buffering-mode!)
150  (let ((size (if (pair? size) (car size) _bufsiz))
151	(mode (case mode
152		((#:full) _iofbf)
153		((#:line) _iolbf)
154		((#:none) _ionbf)
155		(else (##sys#error 'set-buffering-mode! "invalid buffering-mode" mode port)))))
156    (##sys#check-fixnum size 'set-buffering-mode!)
157    (when (fx< (if (eq? 'stream (##sys#slot port 7))
158		   ((foreign-lambda* int ((scheme-object p) (int m) (int s))
159		     "C_return(setvbuf(C_port_file(p), NULL, m, s));")
160		    port mode size)
161		   -1)
162	       0)
163      (##sys#error 'set-buffering-mode! "cannot set buffering mode" port mode size))))
164
165;;;; Port-mapping (found in Gauche):
166
167(define (port-for-each fn thunk)
168  (let loop ()
169    (let ((x (thunk)))
170      (unless (eof-object? x)
171	(fn x)
172	(loop) ) ) ) )
173
174(define port-map
175  (lambda (fn thunk)
176    (let loop ((xs '()))
177      (let ((x (thunk)))
178	(if (eof-object? x)
179	    (##sys#fast-reverse xs)
180	    (loop (cons (fn x) xs)))))))
181
182(define (port-fold fn acc thunk)
183  (let loop ((acc acc))
184    (let ((x (thunk)))
185      (if (eof-object? x)
186          acc
187          (loop (fn x acc))) ) ) )
188
189(define-constant +buf-size+ 1024)
190
191(define copy-port
192  (let ((read-char read-char)
193        (write-char write-char))
194    (define (read-and-write src dest)
195      (##sys#check-port src 'copy-port)
196      (##sys#check-port dest 'copy-port)
197      (let ((buf (##sys#make-bytevector +buf-size+)))
198        (let loop ()
199          (let ((n (chicken.io#read-bytevector!/port +buf-size+
200                     buf src 0)))
201            (unless (eq? n 0)
202              (chicken.io#write-bytevector buf dest 0 n)
203              (loop))))))
204    (define (read-and-delegate src dest writer)
205      (##sys#check-port src 'copy-port)
206      (let ((buf (##sys#make-bytevector +buf-size+)))
207        (let loop ((p 0))
208          (let* ((n (chicken.io#read-bytevector!/port
209                      (fx- +buf-size+ p)
210                      buf src p))
211                 (fc (##core#inline "C_utf_fragment_counts" buf 0 n))
212                 (full (fxshr fc 4))
213                 (part (fxand fc 7))
214                 (str (##sys#buffer->string buf 0 (fx- n part))))
215            (unless (eq? n 0)
216              (do ((i 0 (fx+ i 1)))
217                      ((fx>= i full))
218                (writer (string-ref str i) dest))
219              ;; overlaps, buf source will be at end of buffer
220              (##core#inline "C_copy_memory_with_offset"
221                buf buf
222                (fx- (fx- (##sys#size (##sys#slot str 0)) 1) part)
223                0 part)
224              (loop part))))))
225    (define (delegate src reader dest writer)
226      (let loop ()
227        (let ((x (reader src)))
228          (unless (eof-object? x)
229            (writer x dest)
230            (loop)))))
231    (define (delegate-and-write src reader dest)
232      (##sys#check-port dest 'copy-port)
233      (let ((buf (##sys#make-bytevector (fx+ 4 +buf-size+))))
234        (let loop ((n 0))
235          (when (fx>= n +buf-size+)
236            (chicken.io#write-bytevector buf dest 0 n)
237            (set! n 0))
238          (let ((c (reader src)))
239            (cond ((eof-object? c)
240                   (when (fx>= n 0)
241                     (chicken.io#write-bytevector buf dest 0 n)))
242                  (else
243                   (loop (##core#inline "C_utf_insert" buf n c))))))))
244    (lambda (src dest #!optional (read read-char) (write write-char))
245      ;; does not check port args intentionally
246      (cond ((eq? read read-char)
247                  (if (eq? write write-char)
248                      (read-and-write src dest)
249                  (read-and-delegate src dest write)))
250            ((eq? write write-char)
251             (delegate-and-write src read dest))
252            (else (delegate src read dest write))))))
253
254
255;;;; funky-ports
256
257(define (make-broadcast-port . ports)
258  (make-output-port
259   (lambda (s) (for-each (cut scheme#write-string s <>) ports))
260   void
261   (lambda () (for-each flush-output ports)) ) )
262
263(define (make-concatenated-port p1 . ports)
264  (let ((ports (cons p1 ports)))
265    ;;XXX should also forward other port-methods
266    (make-input-port
267     (lambda ()
268       (let loop ()
269	 (if (null? ports)
270	     #!eof
271	     (let ((c (read-char (car ports))))
272	       (cond ((eof-object? c)
273		      (set! ports (cdr ports))
274		      (loop) )
275		     (else c) ) ) ) ) )
276     (lambda ()
277       (and (not (null? ports))
278	    (char-ready? (car ports))))
279     void
280     peek-char:
281     (lambda ()
282       (let loop ()
283	 (if (null? ports)
284	     #!eof
285	     (let ((c (peek-char (car ports))))
286	       (cond ((eof-object? c)
287		      (set! ports (cdr ports))
288		      (loop) )
289		     (else c))))))
290     read-bytevector:
291     (lambda (p n dest start)
292       (let loop ((n n) (c 0) (p start))
293	 (cond ((null? ports) c)
294	       ((fx<= n 0) c)
295	       (else
296		(let ((m (read-bytevector! dest (car ports) p (+ p n))))
297		  (when (fx< m n)
298		    (set! ports (cdr ports)) )
299		  (loop (fx- n m) (fx+ c m) (fx+ p m))))))))))
300
301
302;;; Redirect standard ports:
303
304(define (with-input-from-port port thunk)
305  (##sys#check-input-port port #t 'with-input-from-port)
306  (fluid-let ((##sys#standard-input port))
307    (thunk) ) )
308
309(define (with-output-to-port port thunk)
310  (##sys#check-output-port port #t 'with-output-to-port)
311  (fluid-let ((##sys#standard-output port))
312    (thunk) ) )
313
314(define (with-error-output-to-port port thunk)
315  (##sys#check-output-port port #t 'with-error-output-to-port)
316  (fluid-let ((##sys#standard-error port))
317    (thunk) ) )
318
319;;; Extended string-port operations:
320
321(define call-with-input-string
322  (lambda (str proc)
323    (let ((in (open-input-string str)))
324      (proc in) ) ) )
325
326(define call-with-output-string
327  (lambda (proc)
328    (let ((out (open-output-string)))
329      (proc out)
330      (get-output-string out) ) ) )
331
332(define with-input-from-string
333  (lambda (str thunk)
334    (fluid-let ([##sys#standard-input (open-input-string str)])
335      (thunk) ) ) )
336
337(define with-output-to-string
338  (lambda (thunk)
339    (fluid-let ((##sys#standard-output (open-output-string)))
340      (thunk)
341      (get-output-string ##sys#standard-output) ) ) )
342
343(define with-error-output-to-string
344  (lambda (thunk)
345    (fluid-let ((##sys#standard-error (open-output-string)))
346      (thunk)
347      (get-output-string ##sys#standard-error) ) ) )
348
349;;; Custom ports:
350;
351; - Port-slots:
352;
353;   10: last/peeked
354
355(define make-input-port
356  (lambda (read ready? close #!rest r
357                #!key peek-char read-bytevector read-line read-buffered)
358    ;XXX this is for ensuring old-style calls fail and can be removed at some stage
359    (when (and (pair? r) (not (##core#inline "C_i_keywordp" (car r))))
360      (error 'make-input-port "invalid invocation - use keyword parameters" r))
361    (let* ((class
362	    (vector
363	     (lambda (p)		; read-char
364	       (let ((last (##sys#slot p 10)))
365		 (cond (peek-char (read))
366		       (last
367			(##sys#setislot p 10 #f)
368			last)
369		       (else (read)) ) ) )
370	     (lambda (p)		; peek-char
371	       (let ((last (##sys#slot p 10)))
372		 (cond (peek-char (peek-char))
373		       (last last)
374		       (else
375			(let ((last (read)))
376			  (##sys#setslot p 10 last)
377			  last) ) ) ) )
378	     #f				; write-char
379	     #f				; write-bytevector
380	     (lambda (p d)		; close
381	       (close))
382	     #f				; flush-output
383	     (lambda (p)		; char-ready?
384	       (ready?) )
385	     (or read-bytevector	; read-bytevector!
386	         (lambda (p n dest start)
387	           (error "binary I/O not supported for custom text input port without bytevector-read method" p)))
388	     read-line			; read-line
389	     read-buffered))
390	   (data (vector #f))
391	   (port (##sys#make-port 1 class "(custom)" 'custom)))
392      (##sys#setslot port 10 #f)
393      (##sys#set-port-data! port data)
394      port) ) )
395
396(define make-output-port
397  (lambda (write close #!rest r #!key force-output)
398    ;XXX this is for ensuring old-style calls fail and can be removed at some stage
399    (when (and (pair? r) (not (##core#inline "C_i_keywordp" (car r))))
400      (error 'make-output-port "invalid invocation - use keyword parameters" r))
401    (let* ((class
402	    (vector
403	     #f				; read-char
404	     #f				; peek-char
405	     (lambda (p c)		; write-char
406	       (write (string c)) )
407	     (lambda (p bv from to)   	; write-bytevector
408               (let ((len (fx- to from)))
409                 (write (##sys#buffer->string bv from len))))
410	     (lambda (p d)		; close
411	       (close))
412	     (lambda (p)		; flush-output
413	       (when force-output (force-output)) )
414	     #f				; char-ready?
415	     #f				; read-bytevector!
416             #f                         ; read-line
417             #f))                         ; read-buffered
418	   (data (vector #f))
419	   (port (##sys#make-port 2 class "(custom)" 'custom)))
420      (##sys#set-port-data! port data)
421      port) ) )
422
423(define (make-bidirectional-port i o)
424  (let* ((class (vector
425		 (lambda (_)             ; read-char
426		   (read-char i))
427		 (lambda (_)             ; peek-char
428		   (peek-char i))
429		 (lambda (_ c)           ; write-char
430		   (write-char c o))
431                 (lambda (_ bv from to)  ; write-bytevector
432                   (chicken.io#write-bytevector bv o from to))
433		 (lambda (_ d)           ; close
434		   (case d
435		     ((1) (close-input-port i))
436		     ((2) (close-output-port o))))
437		 (lambda (_)             ; flush-output
438		   (flush-output o))
439		 (lambda (_)             ; char-ready?
440		   (char-ready? i))
441		 (lambda (_ n d s)       ; read-bytevector!
442		   (chicken.io#read-bytevector! d i s (fx+ s n)))
443		 (lambda (_ l)           ; read-line
444		   (read-line i l))
445		 (lambda ()              ; read-buffered
446		   (read-buffered i))))
447	 (port (##sys#make-port 3 class "(bidirectional)" 'bidirectional)))
448    (##sys#set-port-data! port (vector #f))
449    port))
450
451;; Duplication from posix-common.scm
452(define posix-error
453  (let ((strerror (foreign-lambda c-string "strerror" int))
454	(string-append string-append))
455    (lambda (type loc msg . args)
456      (let ((rn (##sys#update-errno)))
457        (apply ##sys#signal-hook/errno
458               type rn loc (string-append msg " - " (strerror rn)) args)))))
459
460;; Terminal ports
461(define (terminal-port? port)
462  (##sys#check-open-port port 'terminal-port?)
463  (let ((fp (##sys#peek-unsigned-integer port 0)))
464    (and (not (eq? 0 fp)) (##core#inline "C_tty_portp" port))))
465
466(define (check-terminal! caller port)
467  (##sys#check-open-port port caller)
468  (unless (and (eq? 'stream (##sys#slot port 7))
469	       (##core#inline "C_tty_portp" port))
470    (##sys#error caller "port is not connected to a terminal" port)))
471
472(define terminal-name
473  (let ((ttyname (foreign-lambda c-string "ttyname" int)))
474    (lambda (port)
475      (check-terminal! 'terminal-name port)
476      (or (ttyname (##core#inline "C_port_fileno" port))
477	  (posix-error #:error 'terminal-name
478		       "cannot determine terminal name" port)))))
479
480(define terminal-size
481  (let ((ttysize (foreign-lambda int "get_tty_size" int
482				 (nonnull-c-pointer int)
483				 (nonnull-c-pointer int))))
484    (lambda (port)
485      (check-terminal! 'terminal-size port)
486      (let-location ((columns int)
487		     (rows int))
488	(if (fx= 0 (ttysize (##core#inline "C_port_fileno" port)
489			    (location rows)
490			    (location columns)))
491	    (values rows columns)
492	    (posix-error #:error 'terminal-size
493			 "cannot determine terminal size" port))))))
494
495)