139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: interp_forth.c,v 1.6 1998/11/07 03:44:10 jkh Exp $
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*/
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#include <stand.h>
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#include "bootstrap.h"
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#include "ficl.h"
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/* #define BFORTH_DEBUG */
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#ifdef BFORTH_DEBUG
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# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __FUNCTION__ , ## args)
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#else
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# define DEBUG(fmt, args...)
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#endif
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/*
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* BootForth Interface to Ficl Forth interpreter.
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*/
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static FICL_VM *bf_vm;
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/*
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* Shim for taking commands from BF and passing them out to 'standard'
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* argv/argc command functions.
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*/
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static void
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bf_command(FICL_VM *vm)
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{
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char *name, *line, *tail, *cp;
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int len;
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struct bootblk_command **cmdp;
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bootblk_cmd_t *cmd;
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int argc, result;
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char **argv;
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/* Get the name of the current word */
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name = vm->runningWord->name;
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/* Find our command structure */
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cmd == NULL;
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SET_FOREACH(cmdp, Xcommand_set) {
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if (((*cmdp)->c_name != NULL) && !strcmp(name, (*cmdp)->c_name))
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cmd = (*cmdp)->c_fn;
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}
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if (cmd == NULL)
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panic("callout for unknown command '%s'", name);
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/* Get remainder of invocation */
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tail = vmGetInBuf(vm);
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for (cp = tail, len = 0; *cp != 0 && *cp != '\n'; cp++, len++)
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;
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line = malloc(strlen(name) + len + 2);
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strcpy(line, name);
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if (len > 0) {
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strcat(line, " ");
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strncat(line, tail, len);
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vmUpdateTib(vm, tail + len);
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}
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DEBUG("cmd '%s'", line);
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command_errmsg = command_errbuf;
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command_errbuf[0] = 0;
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if (!parse(&argc, &argv, line)) {
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result = (cmd)(argc, argv);
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free(argv);
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if (result != 0) {
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strcpy(command_errmsg, vm->pad);
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vmTextOut(vm, vm->pad, 1);
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}
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} else {
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vmTextOut(vm, "parse error\n", 1);
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}
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free(line);
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}
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/*
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* Initialise the Forth interpreter, create all our commands as words.
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*/
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void
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bf_init(void)
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{
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struct bootblk_command **cmdp;
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int fd;
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ficlInitSystem(4000); /* Default dictionary ~4000 cells */
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bf_vm = ficlNewVM();
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/* make all commands appear as Forth words */
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SET_FOREACH(cmdp, Xcommand_set)
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ficlBuild((*cmdp)->c_name, bf_command, FW_DEFAULT);
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/* try to load and run init file if present */
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if ((fd = open("/boot/boot.4th", O_RDONLY)) != -1) {
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(void)ficlExecFD(bf_vm, fd);
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close(fd);
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}
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}
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/*
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* Feed a line of user input to the Forth interpreter
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*/
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void
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bf_run(char *line)
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{
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int result;
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result = ficlExec(bf_vm, line);
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DEBUG("ficlExec '%s' = %d", line, result);
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if (result == VM_USEREXIT)
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panic("interpreter exit");
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}
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