1 /*
2 * Copyright (c) 1994 University of Maryland
3 * All Rights Reserved.
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and its
6 * documentation for any purpose is hereby granted without fee, provided that
7 * the above copyright notice appear in all copies and that both that
8 * copyright notice and this permission notice appear in supporting
9 * documentation, and that the name of U.M. not be used in advertising or
10 * publicity pertaining to distribution of the software without specific,
11 * written prior permission. U.M. makes no representations about the
12 * suitability of this software for any purpose. It is provided "as is"
13 * without express or implied warranty.
14 *
15 * U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
17 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
19 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
20 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 *
22 * Author: James da Silva, Systems Design and Analysis Group
23 * Computer Science Department
24 * University of Maryland at College Park
25 */
26 /*
27 * crunched_main.c - main program for crunched binaries, it branches to a
28 * particular subprogram based on the value of argv[0]. Also included
29 * is a little program invoked when the crunched binary is called via
30 * its EXECNAME. This one prints out the list of compiled-in binaries,
31 * or calls one of them based on argv[1]. This allows the testing of
32 * the crunched binary without creating all the links.
33 */
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <err.h>
39
40 struct stub {
41 const char *name;
42 int (*f)(int, char **, char **);
43 };
44
45 static const struct stub entry_points[];
46
47 static int crunched_main(int argc, char **, char **);
48 static int cmpstringp(const void *, const void *);
49 static void crunched_usage(void) __dead2;
50
51
52 int
main(int argc,char ** argv,char ** envp)53 main(int argc, char **argv, char **envp)
54 {
55 const char *slash, *basename;
56 const struct stub *ep;
57
58 if (argv[0] == NULL || *argv[0] == '\0')
59 crunched_usage();
60
61 slash = strrchr(argv[0], '/');
62 basename = slash ? slash+1 : argv[0];
63
64 for (ep = entry_points; ep->name != NULL; ep++)
65 if (strcmp(basename, ep->name) == 0)
66 return ep->f(argc, argv, envp);
67
68 fprintf(stderr, "%s: %s not compiled in\n", EXECNAME, basename);
69 crunched_usage();
70 }
71
72
73 static int
crunched_main(int argc,char ** argv,char ** envp)74 crunched_main(int argc, char **argv, char **envp)
75 {
76 if (argc <= 1)
77 crunched_usage();
78
79 return main(--argc, ++argv, envp);
80 }
81
82
83 static int
cmpstringp(const void * p1,const void * p2)84 cmpstringp(const void *p1, const void *p2)
85 {
86 const char *s1 = *(const char **)p1;
87 const char *s2 = *(const char **)p2;
88 return strcmp(s1, s2);
89 }
90
91
92 static void
crunched_usage()93 crunched_usage()
94 {
95 int nprog = 0, columns = 0;
96 int i, len;
97 const struct stub *ep;
98 const char **prognames;
99
100 for (ep = entry_points; ep->name != NULL; ep++)
101 nprog++;
102 if ((prognames = malloc(nprog * sizeof(char *))) == NULL)
103 err(EXIT_FAILURE, "malloc");
104 for (i = 0; i < nprog; i++)
105 prognames[i] = entry_points[i].name;
106 qsort(prognames, nprog, sizeof(char *), cmpstringp);
107
108 fprintf(stderr,
109 "usage: %s <prog> <args> ..., where <prog> is one of:\n",
110 EXECNAME);
111 for (i = 0; i < nprog; i++) {
112 if (strcmp(EXECNAME, prognames[i]) == 0)
113 continue;
114 len = strlen(prognames[i]) + 1;
115 if (columns+len < 80)
116 columns += len;
117 else {
118 fprintf(stderr, "\n");
119 columns = len;
120 }
121 fprintf(stderr, " %s", prognames[i]);
122 }
123 fprintf(stderr, "\n");
124 free(prognames);
125 exit(1);
126 }
127
128 /* end of crunched_main.c */
129