/* $OpenBSD: crunched_main.c,v 1.7 2017/07/27 15:12:30 deraadt Exp $     */

/*
 * Copyright (c) 1994 University of Maryland
 * All Rights Reserved.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of U.M. not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  U.M. makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Author: James da Silva, Systems Design and Analysis Group
 *                         Computer Science Department
 *                         University of Maryland at College Park
 */
/*
 * crunched_main.c - main program for crunched binaries, it branches to a
 *      particular subprogram based on the value of argv[0].  Also included
 *      is a little program invoked when the crunched binary is called via
 *      its EXECNAME.  This one prints out the list of compiled-in binaries,
 *      or calls one of them based on argv[1].   This allows the testing of
 *      the crunched binary without creating all the links.
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct stub {
        char    *name;
        int     (*f)();
};

extern struct stub entry_points[];

void    crunched_usage(void);

static int
crunched_main2(char *progname, int argc, char **argv, char **envp)
{
        struct stub     *ep;

        if (progname == NULL || *progname == '\0')
                crunched_usage();

        for (ep = entry_points; ep->name != NULL; ep++)
                if (!strcmp(progname, ep->name))
                        break;

        if (ep->name)
                return ep->f(argc, argv, envp);
        fprintf(stderr, "%s: %s not compiled in\n", EXECNAME, progname);
        crunched_usage();
        return (1);
}

int
main(int argc, char *argv[], char **envp)
{
        extern char     *__progname;

        return crunched_main2(__progname, argc, argv, envp);
}

int
crunched_main(int argc, char **argv, char **envp)
{
        if (argc <= 1)
                crunched_usage();
        return crunched_main2(argv[1], argc-1, argv+1, envp);
}

void
crunched_usage(void)
{
        int             columns = 0, len;
        struct stub     *ep;

        fprintf(stderr,
            "Usage: %s <prog> <args> ..., where <prog> is one of:\n",
            EXECNAME);
        for (ep = entry_points; ep->name != NULL; ep++) {
                len = strlen(ep->name) + 1;
                if (columns + len < 80)
                        columns += len;
                else {
                        fprintf(stderr, "\n");
                        columns = len;
                }
                fprintf(stderr, " %s", ep->name);
        }
        fprintf(stderr, "\n");
        exit(1);
}