/*      $NetBSD: crunched_main.c,v 1.5 2011/05/15 21:28:51 christos 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 <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: crunched_main.c,v 1.5 2011/05/15 21:28:51 christos Exp $");
#endif

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

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

static const struct stub entry_points[];

static int crunched_main(int , char **, char **);
static int crunched_usage(void) __attribute__((__noreturn__));

int
main(int argc, char **argv, char **envp)
{
       const char *basename;
       const struct stub *ep;

       if (argv[0] == NULL || *argv[0] == '\0')
               crunched_usage();

       basename = strrchr(argv[0], '/');
       basename = basename ? basename + 1 : argv[0];

       for (ep = entry_points; ep->name != NULL; ep++)
               if (strcmp(basename, ep->name) == 0)
                       return ep->f(argc, argv, envp);

       fprintf(stderr, "%s: %s not compiled in\n", EXECNAME, basename);
       crunched_usage();
}


static int
crunched_main(int argc, char **argv, char **envp)
{
       if(argc <= 1)
               crunched_usage();

       return main(--argc, ++argv, envp);
}


static int
crunched_usage(void)
{
       size_t columns, len;
       const struct stub *ep;

       fprintf(stderr, "Usage: %s <prog> <args> ..., "
           "where <prog> is one of:\n", EXECNAME);
       columns = 0;
       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);
}

/* end of crunched_main.c */