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/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Simple commandline interpreter, toplevel and misc.
*
* XXX may be obsoleted by BootFORTH or some other, better, interpreter.
*/
#include <stand.h>
#include <string.h>
#include "bootstrap.h"
#ifdef LOADER_VERIEXEC
#include <verify_file.h>
#endif
#define MAXARGS 20 /* maximum number of arguments allowed */
const char * volatile interp_identifier;
/*
* Interactive mode
*/
void
interact(void)
{
static char input[256]; /* big enough? */
TSENTER();
/*
* Because interp_identifier is volatile, it cannot be optimized out by
* the compiler as it's considered an externally observable event. This
* prevents the compiler from optimizing out our carefully placed
* $Interpreter:4th string that userboot may use to determine that
* we need to switch interpreters.
*/
interp_identifier = bootprog_interp;
interp_init();
printf("\n");
/*
* Before interacting, we might want to autoboot.
*/
autoboot_maybe();
/*
* Not autobooting, go manual
*/
printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
if (getenv("prompt") == NULL)
setenv("prompt", "${interpret}", 1);
if (getenv("interpret") == NULL)
setenv("interpret", "OK", 1);
for (;;) {
input[0] = '\0';
interp_emit_prompt();
ngets(input, sizeof(input));
#ifdef LOADER_VERIEXEC
/* some settings should be restritcted */
ve_status_set(-1, VE_UNVERIFIED_OK);
#endif
interp_run(input);
}
}
/*
* Read commands from a file, then execute them.
*
* We store the commands in memory and close the source file so that the media
* holding it can safely go away while we are executing.
*
* Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
* that the script won't stop if they fail).
*/
COMMAND_SET(include, "include", "read commands from a file", command_include);
static int
command_include(int argc, char *argv[])
{
int i;
int res;
char **argvbuf;
/*
* Since argv is static, we need to save it here.
*/
argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
for (i = 0; i < argc; i++)
argvbuf[i] = strdup(argv[i]);
res=CMD_OK;
for (i = 1; (i < argc) && (res == CMD_OK); i++)
res = interp_include(argvbuf[i]);
for (i = 0; i < argc; i++)
free(argvbuf[i]);
free(argvbuf);
return(res);
}
/*
* Emit the current prompt; use the same syntax as the parser
* for embedding environment variables. Does not accept input.
*/
void
interp_emit_prompt(void)
{
char *pr, *p, *cp, *ev;
if ((cp = getenv("prompt")) == NULL)
cp = ">";
pr = p = strdup(cp);
while (*p != 0) {
if ((*p == '$') && (*(p+1) == '{')) {
for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
;
*cp = 0;
ev = getenv(p + 2);
if (ev != NULL)
printf("%s", ev);
p = cp + 1;
continue;
}
putchar(*p++);
}
putchar(' ');
free(pr);
}
static struct bootblk_command *
interp_lookup_cmd(const char *cmd)
{
struct bootblk_command **cmdp;
/* search the command set for the command */
SET_FOREACH(cmdp, Xcommand_set) {
if (((*cmdp)->c_name != NULL) && !strcmp(cmd, (*cmdp)->c_name))
return (*cmdp);
}
return (NULL);
}
/*
* Perform a builtin command
*/
int
interp_builtin_cmd(int argc, char *argv[])
{
int result;
struct bootblk_command *cmd;
if (argc < 1)
return (CMD_OK);
/* set return defaults; a successful command will override these */
command_errmsg = command_errbuf;
strcpy(command_errbuf, "no error message");
result = CMD_ERROR;
cmd = interp_lookup_cmd(argv[0]);
if (cmd != NULL && cmd->c_fn) {
result = cmd->c_fn(argc, argv);
} else {
command_errmsg = "unknown command";
}
return (result);
}
/*
* Return true if the builtin command exists
*/
bool
interp_has_builtin_cmd(const char *cmd)
{
return (interp_lookup_cmd(cmd) != NULL);
}
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