xref: /freebsd/stand/common/interp.c (revision 79a6a17abd829b556947ba20aa1700e569a26786)

/*-
 * 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * 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"

#define	MAXARGS	20			/* maximum number of arguments allowed */

/*
 * Interactive mode
 */
void
interact(void)
{
    static char	input[256];			/* big enough? */

    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));
	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);
}