1 /* $OpenBSD: crunched_main.c,v 1.4 2014/01/11 04:43:00 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 int 48 main(int argc, char *argv[], char **envp) 49 { 50 char *slash, *basename; 51 struct stub *ep; 52 53 if (argv[0] == NULL || *argv[0] == '\0') 54 crunched_usage(); 55 56 slash = strrchr(argv[0], '/'); 57 basename = slash ? slash + 1 : argv[0]; 58 59 for (ep = entry_points; ep->name != NULL; ep++) 60 if (!strcmp(basename, ep->name)) 61 break; 62 63 if (ep->name) 64 return ep->f(argc, argv, envp); 65 fprintf(stderr, "%s: %s not compiled in\n", EXECNAME, basename); 66 crunched_usage(); 67 } 68 69 int 70 crunched_main(int argc, char **argv, char **envp) 71 { 72 struct stub *ep; 73 int columns, len; 74 75 if (argc <= 1) 76 crunched_usage(); 77 78 return main(--argc, ++argv, envp); 79 } 80 81 int 82 crunched_usage(void) 83 { 84 int columns = 0, len; 85 struct stub *ep; 86 87 fprintf(stderr, 88 "Usage: %s <prog> <args> ..., where <prog> is one of:\n", 89 EXECNAME); 90 for (ep = entry_points; ep->name != NULL; ep++) { 91 len = strlen(ep->name) + 1; 92 if (columns + len < 80) 93 columns += len; 94 else { 95 fprintf(stderr, "\n"); 96 columns = len; 97 } 98 fprintf(stderr, " %s", ep->name); 99 } 100 fprintf(stderr, "\n"); 101 exit(1); 102 } 103