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87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/* crepl.c
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* Copyright 1984-2017 Cisco Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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This is a variant of main.c that implements a Scheme repl in C.
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It's not at all useful, but it highlights how to invoke Scheme
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without going through Sscheme_start.
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Test in a workarea's examples subdirectory with:
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( cd ../c ; ln -sf ../examples/crepl.c . )
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( cd ../c ; make mainsrc=crepl.c )
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sh -c 'SCHEMEHEAPDIRS=../boot/%m ../bin/scheme'
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*/
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#include "scheme.h"
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#include <stdio.h>
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#include <stdlib.h>
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#define CALL0(who) Scall0(Stop_level_value(Sstring_to_symbol(who)))
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#define CALL1(who, arg) Scall1(Stop_level_value(Sstring_to_symbol(who)), arg)
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static void custom_init(void) {}
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int main(int argc, char *argv[]) {
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int n, new_argc = 1, ignoreflags = 0;
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ptr p;
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Sscheme_init(NULL);
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/* process command-line arguments, registering boot and heap files */
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for (n = 1; n < argc; n += 1) {
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if (!ignoreflags && *argv[n] == '-') {
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switch (*(argv[n]+1)) {
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case '-': /* pass through remaining options */
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if (*(argv[n]+2) != 0) break;
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ignoreflags = 1;
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continue;
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case 'b': /* boot option, expects boot file pathname */
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if (*(argv[n]+2) != 0) break;
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if (++n == argc) {
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(void) fprintf(stderr,"\n-b option requires argument\n");
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exit(1);
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}
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Sregister_boot_file(argv[n]);
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continue;
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default:
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break;
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}
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}
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argv[new_argc++] = argv[n];
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}
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/* must call Sscheme_heap after registering boot and heap files
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* Sscheme_heap() completes the initialization of the Scheme system
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* and loads the boot or heap files. Before loading boot files,
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* it calls custom_init(). */
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Sbuild_heap(argv[0], custom_init);
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for (;;) {
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CALL1("display", Sstring("* "));
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p = CALL0("read");
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if (Seof_objectp(p)) break;
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p = CALL1("eval", p);
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if (p != Svoid) CALL1("pretty-print", p);
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}
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CALL0("newline");
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/* must call Scheme_deinit after saving the heap and before exiting */
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Sscheme_deinit();
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exit(0);
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}
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