1 /* $NetBSD: crunched_main.c,v 1.5 2011/05/15 21:28:51 christos Exp $ */
2 /*
3 * Copyright (c) 1994 University of Maryland
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify, distribute, and sell this software and its
7 * documentation for any purpose is hereby granted without fee, provided that
8 * the above copyright notice appear in all copies and that both that
9 * copyright notice and this permission notice appear in supporting
10 * documentation, and that the name of U.M. not be used in advertising or
11 * publicity pertaining to distribution of the software without specific,
12 * written prior permission. U.M. makes no representations about the
13 * suitability of this software for any purpose. It is provided "as is"
14 * without express or implied warranty.
15 *
16 * U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
18 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
20 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
21 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 *
23 * Author: James da Silva, Systems Design and Analysis Group
24 * Computer Science Department
25 * University of Maryland at College Park
26 */
27 /*
28 * crunched_main.c - main program for crunched binaries, it branches to a
29 * particular subprogram based on the value of argv[0]. Also included
30 * is a little program invoked when the crunched binary is called via
31 * its EXECNAME. This one prints out the list of compiled-in binaries,
32 * or calls one of them based on argv[1]. This allows the testing of
33 * the crunched binary without creating all the links.
34 */
35 #include <sys/cdefs.h>
36 #ifndef lint
37 __RCSID("$NetBSD: crunched_main.c,v 1.5 2011/05/15 21:28:51 christos Exp $");
38 #endif
39
40 #include <stdio.h>
41 #include <string.h>
42 #include <stdlib.h>
43
44 struct stub {
45 const char *name;
46 int (*f)(int, char **, char **);
47 };
48
49 static const struct stub entry_points[];
50
51 static int crunched_main(int , char **, char **);
52 static int crunched_usage(void) __attribute__((__noreturn__));
53
54 int
main(int argc,char ** argv,char ** envp)55 main(int argc, char **argv, char **envp)
56 {
57 const char *basename;
58 const struct stub *ep;
59
60 if (argv[0] == NULL || *argv[0] == '\0')
61 crunched_usage();
62
63 basename = strrchr(argv[0], '/');
64 basename = basename ? basename + 1 : argv[0];
65
66 for (ep = entry_points; ep->name != NULL; ep++)
67 if (strcmp(basename, ep->name) == 0)
68 return ep->f(argc, argv, envp);
69
70 fprintf(stderr, "%s: %s not compiled in\n", EXECNAME, basename);
71 crunched_usage();
72 }
73
74
75 static int
crunched_main(int argc,char ** argv,char ** envp)76 crunched_main(int argc, char **argv, char **envp)
77 {
78 if(argc <= 1)
79 crunched_usage();
80
81 return main(--argc, ++argv, envp);
82 }
83
84
85 static int
crunched_usage(void)86 crunched_usage(void)
87 {
88 size_t columns, len;
89 const struct stub *ep;
90
91 fprintf(stderr, "Usage: %s <prog> <args> ..., "
92 "where <prog> is one of:\n", EXECNAME);
93 columns = 0;
94 for (ep = entry_points; ep->name != NULL; ep++) {
95 len = strlen(ep->name) + 1;
96 if (columns + len < 80)
97 columns += len;
98 else {
99 fprintf(stderr, "\n");
100 columns = len;
101 }
102 fprintf(stderr, " %s", ep->name);
103 }
104 fprintf(stderr, "\n");
105 exit(1);
106 }
107
108 /* end of crunched_main.c */
109