59 lines
1.4 KiB
Scheme
59 lines
1.4 KiB
Scheme
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; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
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; This is file features.scm.
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; Synchronize any changes with all the other *-features.scm files.
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; These definitions should be quite portable to any Scheme implementation.
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; Assumes Revised^5 Report Scheme, for EVAL and friends.
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; SIGNALS
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(define (error message . irritants)
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(display-error-message "Error: " message irritants)
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(an-error-occurred-now-what?))
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(define (warn message . irritants)
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(display-error-message "Warning: " message irritants))
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(define (display-error-message heading message irritants)
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(display heading)
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(display message)
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(newline)
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(let ((spaces (list->string
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(map (lambda (c) #\space) (string->list heading)))))
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(for-each (lambda (irritant)
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(display spaces)
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(write irritant)
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(newline))
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irritants)))
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; Linker also needs SIGNAL, SYNTAX-ERROR, CALL-ERROR
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; HANDLE
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(define (ignore-errors thunk)
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'(error "ignore-errors isn't implemented"))
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; FEATURES
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(define (force-output port) #f)
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(define (string-hash s)
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(let ((n (string-length s)))
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(do ((i 0 (+ i 1))
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(h 0 (+ h (char->ascii (string-ref s i)))))
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((>= i n) h))))
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(define (make-immutable! thing) #f)
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(define (immutable? thing) #f)
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(define (unspecific) (if #f #f))
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; BITWISE -- use alt/bitwise.scm (!)
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; ACII -- use alt/ascii.scm
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; CODE-VECTORS -- use alt/code-vectors.scm
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