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/* $OpenBSD: crunched_main.c,v 1.6 2016/05/20 01:28:43 guenther 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[];
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();
}
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);
}
int
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);
}
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