interp_forth.c revision 40984 
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 1.5 1998/11/06 03:50:44 msmith Exp $
27 */
28
29#include <stand.h>
30#include "bootstrap.h"
31#include "ficl.h"
32
33/* #define BFORTH_DEBUG */
34
35#ifdef BFORTH_DEBUG
36# define DEBUG(fmt, args...)	printf("%s: " fmt "\n" , __FUNCTION__ , ## args)
37#else
38# define DEBUG(fmt, args...)
39#endif
40
41/*
42 * BootForth   Interface to Ficl Forth interpreter.
43 */
44
45static FICL_VM	*bf_vm;
46
47/*
48 * Shim for taking commands from BF and passing them out to 'standard'
49 * argv/argc command functions.
50 */
51static void
52bf_command(FICL_VM *vm)
53{
54    char			*name, *line, *tail, *cp;
55    int				len;
56    struct bootblk_command	**cmdp;
57    bootblk_cmd_t		*cmd;
58    int				argc, result;
59    char			**argv;
60
61    /* Get the name of the current word */
62    name = vm->runningWord->name;
63
64    /* Find our command structure */
65    cmd == NULL;
66    SET_FOREACH(cmdp, Xcommand_set) {
67	if (((*cmdp)->c_name != NULL) && !strcmp(name, (*cmdp)->c_name))
68	    cmd = (*cmdp)->c_fn;
69    }
70    if (cmd == NULL)
71	panic("callout for unknown command '%s'", name);
72
73    /* Get remainder of invocation */
74    tail = vmGetInBuf(vm);
75    for (cp = tail, len = 0; *cp != 0 && *cp != '\n'; cp++, len++)
76	;
77
78    line = malloc(strlen(name) + len + 2);
79    strcpy(line, name);
80    if (len > 0) {
81	strcat(line, " ");
82	strncat(line, tail, len);
83	vmUpdateTib(vm, tail + len);
84    }
85    DEBUG("cmd '%s'", line);
86
87    command_errmsg = command_errbuf;
88    command_errbuf[0] = 0;
89    if (!parse(&argc, &argv, line)) {
90	result = (cmd)(argc, argv);
91	free(argv);
92	if (result != 0) {
93	    strcpy(command_errmsg, vm->pad);
94	    vmTextOut(vm, vm->pad, 1);
95	}
96    } else {
97	vmTextOut(vm, "parse error\n", 1);
98    }
99    free(line);
100}
101
102/*
103 * Initialise the Forth interpreter, create all our commands as words.
104 */
105void
106bf_init(void)
107{
108    struct bootblk_command	**cmdp;
109
110    ficlInitSystem(4000);	/* Default dictionary ~4000 cells */
111    bf_vm = ficlNewVM();
112
113    /* make all commands appear as Forth words */
114    SET_FOREACH(cmdp, Xcommand_set)
115	ficlBuild((*cmdp)->c_name, bf_command, FW_DEFAULT);
116    /* run the init word from softcore */
117    ficlExec(bf_vm, "init");
118}
119
120/*
121 * Feed a line of user input to the Forth interpreter
122 */
123void
124bf_run(char *line)
125{
126    int		result;
127
128    result = ficlExec(bf_vm, line);
129    DEBUG("ficlExec '%s' = %d", line, result);
130
131    if (result == VM_USEREXIT)
132	panic("interpreter exit");
133}
134