1c49fb07d8
a built-in command on Forth stack. * Fix a bug which was causing a panic when loading stripped aout kernels. Reviewed by: jkh
282 lines
6.3 KiB
C
282 lines
6.3 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.c,v 1.8 1998/11/04 00:29:01 msmith Exp $
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*/
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/*
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* Simple commandline interpreter, toplevel and misc.
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*
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* XXX may be obsoleted by BootFORTH or some other, better, interpreter.
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*/
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#include <stand.h>
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#include <string.h>
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#include "bootstrap.h"
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#ifdef BOOT_FORTH
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#include "ficl.h"
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#define RETURN(x) stackPushINT32(bf_vm->pStack,!x); return(x)
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extern FICL_VM *bf_vm;
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#else
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#define RETURN(x) return(x)
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#endif
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#define MAXARGS 20 /* maximum number of arguments allowed */
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static void prompt(void);
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/*
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* Perform the command
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*/
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int
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perform(int argc, char *argv[])
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{
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int i, result;
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struct bootblk_command **cmdp;
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bootblk_cmd_t *cmd;
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if (argc < 1)
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return(CMD_OK);
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/* set return defaults; a successful command will override these */
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command_errmsg = command_errbuf;
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strcpy(command_errbuf, "no error message");
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cmd = NULL;
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result = CMD_ERROR;
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/* search the command set for the command */
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SET_FOREACH(cmdp, Xcommand_set) {
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if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*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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result = (cmd)(argc, argv);
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} else {
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command_errmsg = "unknown command";
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}
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RETURN(result);
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}
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/*
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* Interactive mode
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*/
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void
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interact(void)
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{
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char input[256]; /* big enough? */
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int argc;
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char **argv;
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#ifdef BOOT_FORTH
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bf_init();
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#endif
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/*
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* Read our default configuration
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*/
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source("/boot/boot.conf");
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printf("\n");
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/*
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* Before interacting, we might want to autoboot.
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*/
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autoboot_maybe();
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/*
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* Not autobooting, go manual
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*/
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printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
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setenv("prompt", "${currdev}>", 1);
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for (;;) {
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input[0] = '\0';
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prompt();
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ngets(input, sizeof(input));
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#ifdef BOOT_FORTH
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bf_run(input);
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#else
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if (!parse(&argc, &argv, input)) {
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if (perform(argc, argv))
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printf("%s: %s\n", argv[0], command_errmsg);
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free(argv);
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} else {
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printf("parse error\n");
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}
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#endif
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}
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}
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/*
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* Read commands from a file, then execute them.
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*
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* We store the commands in memory and close the source file so that the media
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* holding it can safely go away while we are executing.
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*
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* Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
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* that the script won't stop if they fail).
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*/
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COMMAND_SET(source, "source", "read commands from a file", command_source);
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static int
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command_source(int argc, char *argv[])
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{
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int i;
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for (i = 1; i < argc; i++)
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source(argv[i]);
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RETURN(CMD_OK);
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}
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struct sourceline
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{
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char *text;
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int flags;
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int line;
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#define SL_QUIET (1<<0)
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#define SL_IGNOREERR (1<<1)
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struct sourceline *next;
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};
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void
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source(char *filename)
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{
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struct sourceline *script, *se, *sp;
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char input[256]; /* big enough? */
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int argc;
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char **argv, *cp;
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int fd, flags, line;
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if (((fd = open(filename, O_RDONLY)) == -1)) {
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printf("can't open '%s': %s\n", filename, strerror(errno));
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return;
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}
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/*
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* Read the script into memory.
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*/
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script = se = NULL;
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line = 0;
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while (fgetstr(input, sizeof(input), fd) > 0) {
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line++;
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flags = 0;
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/* Discard comments */
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if (input[0] == '#')
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continue;
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cp = input;
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/* Echo? */
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if (input[0] == '@') {
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cp++;
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flags |= SL_QUIET;
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}
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/* Error OK? */
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if (input[0] == '-') {
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cp++;
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flags |= SL_IGNOREERR;
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}
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/* Allocate script line structure and copy line, flags */
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sp = malloc(sizeof(struct sourceline) + strlen(cp) + 1);
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sp->text = (char *)sp + sizeof(struct sourceline);
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strcpy(sp->text, cp);
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sp->flags = flags;
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sp->line = line;
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sp->next = NULL;
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if (script == NULL) {
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script = sp;
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} else {
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se->next = sp;
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}
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se = sp;
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}
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close(fd);
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/*
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* Execute the script
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*/
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argv = NULL;
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for (sp = script; sp != NULL; sp = sp->next) {
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/* print if not being quiet */
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if (!(sp->flags & SL_QUIET)) {
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prompt();
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printf("%s\n", sp->text);
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}
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/* Parse the command */
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if (!parse(&argc, &argv, sp->text)) {
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if ((argc > 0) && (perform(argc, argv) != 0)) {
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/* normal command */
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printf("%s: %s\n", argv[0], command_errmsg);
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if (!(sp->flags & SL_IGNOREERR))
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break;
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}
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free(argv);
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argv = NULL;
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} else {
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printf("%s line %d: parse error\n", filename, sp->line);
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break;
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}
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}
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if (argv != NULL)
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free(argv);
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while(script != NULL) {
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se = script;
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script = script->next;
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free(se);
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}
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}
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/*
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* Emit the current prompt; use the same syntax as the parser
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* for embedding environment variables.
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*/
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static void
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prompt(void)
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{
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char *p, *cp, *ev;
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if ((cp = getenv("prompt")) == NULL)
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cp = ">";
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p = strdup(cp);
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while (*p != 0) {
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if ((*p == '$') && (*(p+1) == '{')) {
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for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
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;
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*cp = 0;
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ev = getenv(p + 2);
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if (ev != NULL)
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printf(ev);
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p = cp + 1;
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continue;
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}
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putchar(*p++);
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}
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putchar(' ');
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}
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