1 /* $OpenBSD: crunched_main.c,v 1.7 2017/07/27 15:12:30 deraadt Exp $	 */
2 
3 /*
4  * Copyright (c) 1994 University of Maryland
5  * All Rights Reserved.
6  *
7  * Permission to use, copy, modify, distribute, and sell this software and its
8  * documentation for any purpose is hereby granted without fee, provided that
9  * the above copyright notice appear in all copies and that both that
10  * copyright notice and this permission notice appear in supporting
11  * documentation, and that the name of U.M. not be used in advertising or
12  * publicity pertaining to distribution of the software without specific,
13  * written prior permission.  U.M. makes no representations about the
14  * suitability of this software for any purpose.  It is provided "as is"
15  * without express or implied warranty.
16  *
17  * U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
19  * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
20  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
21  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
22  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23  *
24  * Author: James da Silva, Systems Design and Analysis Group
25  *			   Computer Science Department
26  *			   University of Maryland at College Park
27  */
28 /*
29  * crunched_main.c - main program for crunched binaries, it branches to a
30  *	particular subprogram based on the value of argv[0].  Also included
31  *	is a little program invoked when the crunched binary is called via
32  *	its EXECNAME.  This one prints out the list of compiled-in binaries,
33  *	or calls one of them based on argv[1].   This allows the testing of
34  *	the crunched binary without creating all the links.
35  */
36 #include <stdio.h>
37 #include <string.h>
38 #include <stdlib.h>
39 
40 struct stub {
41 	char	*name;
42 	int	(*f)();
43 };
44 
45 extern struct stub entry_points[];
46 
47 void	crunched_usage(void);
48 
49 static int
50 crunched_main2(char *progname, int argc, char **argv, char **envp)
51 {
52 	struct stub	*ep;
53 
54 	if (progname == NULL || *progname == '\0')
55 		crunched_usage();
56 
57 	for (ep = entry_points; ep->name != NULL; ep++)
58 		if (!strcmp(progname, ep->name))
59 			break;
60 
61 	if (ep->name)
62 		return ep->f(argc, argv, envp);
63 	fprintf(stderr, "%s: %s not compiled in\n", EXECNAME, progname);
64 	crunched_usage();
65 	return (1);
66 }
67 
68 int
69 main(int argc, char *argv[], char **envp)
70 {
71 	extern char	*__progname;
72 
73 	return crunched_main2(__progname, argc, argv, envp);
74 }
75 
76 int
77 crunched_main(int argc, char **argv, char **envp)
78 {
79 	if (argc <= 1)
80 		crunched_usage();
81 	return crunched_main2(argv[1], argc-1, argv+1, envp);
82 }
83 
84 void
85 crunched_usage(void)
86 {
87 	int		columns = 0, len;
88 	struct stub	*ep;
89 
90 	fprintf(stderr,
91 	    "Usage: %s <prog> <args> ..., where <prog> is one of:\n",
92 	    EXECNAME);
93 	for (ep = entry_points; ep->name != NULL; ep++) {
94 		len = strlen(ep->name) + 1;
95 		if (columns + len < 80)
96 			columns += len;
97 		else {
98 			fprintf(stderr, "\n");
99 			columns = len;
100 		}
101 		fprintf(stderr, " %s", ep->name);
102 	}
103 	fprintf(stderr, "\n");
104 	exit(1);
105 }
106