interp_forth.c revision 40882 
1/*
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	$Id: interp_forth.c,v 1.1 1998/11/04 00:29:01 msmith Exp $
27 */
28
29#include <stand.h>
30#include "bootstrap.h"
31#include "ficl.h"
32
33/*
34 * BootForth   Interface to Ficl Forth interpreter.
35 */
36
37static FICL_VM	*bf_vm;
38
39/*
40 * Shim for taking commands from BF and passing them out to 'standard'
41 * argv/argc command functions.
42 */
43static void
44bf_command(FICL_VM *vm)
45{
46    struct bootblk_command	**cmdp;
47    bootblk_cmd_t		*cmd;
48    char			*name, *line;
49    FICL_STRING			*tail = (FICL_STRING *)vm->pad;
50    int				argc, result;
51    char			**argv;
52
53    /* Get the name of the current word */
54    name = vm->runningWord->name;
55
56    /* Find our command structure */
57    SET_FOREACH(cmdp, Xcommand_set) {
58	if (((*cmdp)->c_name != NULL) && !strcmp(name, (*cmdp)->c_name))
59	    cmd = (*cmdp)->c_fn;
60    }
61    if (cmd == NULL)
62	panic("callout for unknown command '%s'", name);
63
64    /* Get remainder of invocation */
65    vmGetString(vm, tail, '\n');
66
67    /* XXX This is grostic */
68    line = malloc(strlen(name) + strlen(tail->text) + 2);
69    sprintf(line, "%s %s", name, tail->text);
70    command_errmsg = command_errbuf;
71    command_errbuf[0] = 0;
72    if (!parse(&argc, &argv, line)) {
73	result = (cmd)(argc, argv);
74	free(argv);
75	if (result != 0) {
76	    strcpy(command_errmsg, vm->pad);
77	    vmTextOut(vm, vm->pad, 1);
78	}
79    } else {
80	vmTextOut(vm, "parse error\n", 1);
81    }
82    free(line);
83}
84
85/*
86 * Initialise the Forth interpreter, create all our commands as words.
87 */
88void
89bf_init(void)
90{
91    struct bootblk_command	**cmdp;
92
93    ficlInitSystem(3000);	/* Default dictionary ~2000 cells */
94    bf_vm = ficlNewVM();
95
96    /* make all commands appear as Forth words */
97    SET_FOREACH(cmdp, Xcommand_set)
98	ficlBuild((*cmdp)->c_name, bf_command, FW_DEFAULT);
99
100}
101
102/*
103 * Feed a line of user input to the Forth interpreter
104 */
105void
106bf_run(char *line)
107{
108    int		result;
109
110    result = ficlExec(bf_vm, line);
111    if (result == VM_USEREXIT)
112	panic("interpreter exit");
113}
114