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 * $FreeBSD$ 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 39 struct stub { 40 char *name; 41 int (*f)(); 42 }; 43 44 extern struct stub entry_points[]; 45 46 int main(int argc, char **argv, char **envp) 47 { 48 char *slash, *basename; 49 struct stub *ep; 50 51 if(argv[0] == NULL || *argv[0] == '\0') 52 crunched_usage(); 53 54 slash = strrchr(argv[0], '/'); 55 basename = slash? slash+1 : argv[0]; 56 57 for(ep=entry_points; ep->name != NULL; ep++) 58 if(!strcmp(basename, ep->name)) break; 59 60 if(ep->name) 61 return ep->f(argc, argv, envp); 62 else { 63 fprintf(stderr, "%s: %s not compiled in\n", EXECNAME, basename); 64 crunched_usage(); 65 } 66 } 67 68 69 int crunched_here(char *path) 70 { 71 char *slash, *basename; 72 struct stub *ep; 73 74 slash = strrchr(path, '/'); 75 basename = slash? slash+1 : path; 76 77 for(ep=entry_points; ep->name != NULL; ep++) 78 if(!strcmp(basename, ep->name)) 79 return 1; 80 return 0; 81 } 82 83 84 int crunched_main(int argc, char **argv, char **envp) 85 { 86 struct stub *ep; 87 int columns, len; 88 89 if(argc <= 1) 90 crunched_usage(); 91 92 return main(--argc, ++argv, envp); 93 } 94 95 96 int crunched_usage() 97 { 98 int columns, len; 99 struct stub *ep; 100 101 fprintf(stderr, "usage: %s <prog> <args> ..., where <prog> is one of:\n", 102 EXECNAME); 103 columns = 0; 104 for(ep=entry_points; ep->name != NULL; ep++) { 105 len = strlen(ep->name) + 1; 106 if(columns+len < 80) 107 columns += len; 108 else { 109 fprintf(stderr, "\n"); 110 columns = len; 111 } 112 fprintf(stderr, " %s", ep->name); 113 } 114 fprintf(stderr, "\n"); 115 exit(1); 116 } 117 118 /* end of crunched_main.c */ 119 120