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98c27b65 JB |
1 | ;;;; r4rs.scm --- definitions needed for libguile to be R4RS compliant |
2 | ;;;; Jim Blandy <jimb@cyclic.com> --- October 1996 | |
3 | ||
9630e974 | 4 | ;;;; Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. |
98c27b65 JB |
5 | ;;;; |
6 | ;;;; This program is free software; you can redistribute it and/or modify | |
7 | ;;;; it under the terms of the GNU General Public License as published by | |
8 | ;;;; the Free Software Foundation; either version 2, or (at your option) | |
9 | ;;;; any later version. | |
10 | ;;;; | |
11 | ;;;; This program is distributed in the hope that it will be useful, | |
12 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;;;; GNU General Public License for more details. | |
15 | ;;;; | |
16 | ;;;; You should have received a copy of the GNU General Public License | |
17 | ;;;; along with this software; see the file COPYING. If not, write to | |
15328041 JB |
18 | ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
19 | ;;;; Boston, MA 02111-1307 USA | |
98c27b65 JB |
20 | |
21 | \f | |
22 | ;;;; apply and call-with-current-continuation | |
23 | ||
06a02069 MD |
24 | ;;; We want these to be tail-recursive, so instead of using primitive |
25 | ;;; procedures, we define them as closures in terms of the primitive | |
26 | ;;; macros @apply and @call-with-current-continuation. | |
98c27b65 | 27 | (set! apply (lambda (fun . args) (@apply fun (apply:nconc2last args)))) |
8fa5faad | 28 | (set-procedure-property! apply 'name 'apply) |
98c27b65 JB |
29 | (define (call-with-current-continuation proc) |
30 | (@call-with-current-continuation proc)) | |
31 | ||
32 | \f | |
33 | ;;;; Basic Port Code | |
34 | ||
35 | ;;; Specifically, the parts of the low-level port code that are written in | |
36 | ;;; Scheme rather than C. | |
37 | ;;; | |
38 | ;;; WARNING: the parts of this interface that refer to file ports | |
39 | ;;; are going away. It would be gone already except that it is used | |
40 | ;;; "internally" in a few places. | |
41 | ||
42 | ||
670600bd JB |
43 | ;;; OPEN_READ, OPEN_WRITE, and OPEN_BOTH are used to request the |
44 | ;;; proper mode to open files in. | |
45 | ;;; | |
46 | ;;; If we want to support systems that do CRLF->LF translation, like | |
47 | ;;; Windows, then we should have a symbol in scmconfig.h made visible | |
48 | ;;; to the Scheme level that we can test here, and autoconf magic to | |
49 | ;;; #define it when appropriate. Windows will probably just have a | |
50 | ;;; hand-generated scmconfig.h file. | |
51 | (define OPEN_READ "r") | |
52 | (define OPEN_WRITE "w") | |
53 | (define OPEN_BOTH "r+") | |
98c27b65 JB |
54 | |
55 | (define *null-device* "/dev/null") | |
56 | ||
57 | (define (open-input-file str) | |
58 | (open-file str OPEN_READ)) | |
59 | ||
60 | (define (open-output-file str) | |
61 | (open-file str OPEN_WRITE)) | |
62 | ||
63 | (define (open-io-file str) (open-file str OPEN_BOTH)) | |
64 | (define close-input-port close-port) | |
65 | (define close-output-port close-port) | |
66 | (define close-io-port close-port) | |
67 | ||
68 | (define (call-with-input-file str proc) | |
69 | (let* ((file (open-input-file str)) | |
70 | (ans (proc file))) | |
71 | (close-input-port file) | |
72 | ans)) | |
73 | ||
74 | (define (call-with-output-file str proc) | |
75 | (let* ((file (open-output-file str)) | |
76 | (ans (proc file))) | |
77 | (close-output-port file) | |
78 | ans)) | |
79 | ||
80 | (define (with-input-from-port port thunk) | |
81 | (let* ((swaports (lambda () (set! port (set-current-input-port port))))) | |
82 | (dynamic-wind swaports thunk swaports))) | |
83 | ||
84 | (define (with-output-to-port port thunk) | |
85 | (let* ((swaports (lambda () (set! port (set-current-output-port port))))) | |
86 | (dynamic-wind swaports thunk swaports))) | |
87 | ||
88 | (define (with-error-to-port port thunk) | |
89 | (let* ((swaports (lambda () (set! port (set-current-error-port port))))) | |
90 | (dynamic-wind swaports thunk swaports))) | |
91 | ||
92 | (define (with-input-from-file file thunk) | |
93 | (let* ((nport (open-input-file file)) | |
94 | (ans (with-input-from-port nport thunk))) | |
95 | (close-port nport) | |
96 | ans)) | |
97 | ||
98 | (define (with-output-to-file file thunk) | |
99 | (let* ((nport (open-output-file file)) | |
100 | (ans (with-output-to-port nport thunk))) | |
101 | (close-port nport) | |
102 | ans)) | |
103 | ||
104 | (define (with-error-to-file file thunk) | |
105 | (let* ((nport (open-output-file file)) | |
106 | (ans (with-error-to-port nport thunk))) | |
107 | (close-port nport) | |
108 | ans)) | |
109 | ||
110 | (define (with-input-from-string string thunk) | |
111 | (call-with-input-string string | |
112 | (lambda (p) (with-input-from-port p thunk)))) | |
113 | ||
114 | (define (with-output-to-string thunk) | |
115 | (call-with-output-string | |
116 | (lambda (p) (with-output-to-port p thunk)))) | |
117 | ||
118 | (define (with-error-to-string thunk) | |
119 | (call-with-output-string | |
120 | (lambda (p) (with-error-to-port p thunk)))) | |
121 | ||
122 | (define the-eof-object (call-with-input-string "" (lambda (p) (read-char p)))) | |
123 | ||
124 | \f | |
125 | ;;;; Loading | |
126 | ||
0065d90e | 127 | (if (not (defined? '%load-verbosely)) |
98c27b65 JB |
128 | (define %load-verbosely #f)) |
129 | (define (assert-load-verbosity v) (set! %load-verbosely v)) | |
130 | ||
131 | (define (%load-announce file) | |
132 | (if %load-verbosely | |
133 | (with-output-to-port (current-error-port) | |
134 | (lambda () | |
135 | (display ";;; ") | |
136 | (display "loading ") | |
137 | (display file) | |
138 | (newline) | |
139 | (force-output))))) | |
140 | ||
141 | (set! %load-hook %load-announce) | |
142 | ||
98c27b65 JB |
143 | (define (load name) |
144 | (start-stack 'load-stack | |
75a97b92 | 145 | (primitive-load name))) |