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 39 struct stub { 40 char *name; 41 int (*f)(); 42 }; 43 44 extern char *__progname; 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)) break; 61 62 if(ep->name) 63 return ep->f(argc, argv, envp); 64 else { 65 fprintf(stderr, "%s: %s not compiled in\n", EXECNAME, basename); 66 crunched_usage(); 67 } 68 } 69 70 71 int 72 crunched_here(char *path) 73 { 74 char *slash, *basename; 75 struct stub *ep; 76 77 slash = strrchr(path, '/'); 78 basename = slash? slash+1 : path; 79 80 for(ep=entry_points; ep->name != NULL; ep++) 81 if(!strcmp(basename, ep->name)) 82 return 1; 83 return 0; 84 } 85 86 87 int 88 crunched_main(int argc, char **argv, char **envp) 89 { 90 char *slash; 91 struct stub *ep; 92 int columns, len; 93 94 if(argc <= 1) 95 crunched_usage(); 96 97 slash = strrchr(argv[1], '/'); 98 __progname = slash? slash+1 : argv[1]; 99 100 return main(--argc, ++argv, envp); 101 } 102 103 104 int 105 crunched_usage() 106 { 107 int columns, len; 108 struct stub *ep; 109 110 fprintf(stderr, "usage: %s <prog> <args> ..., where <prog> is one of:\n", 111 EXECNAME); 112 columns = 0; 113 for(ep=entry_points; ep->name != NULL; ep++) { 114 len = strlen(ep->name) + 1; 115 if(columns+len < 80) 116 columns += len; 117 else { 118 fprintf(stderr, "\n"); 119 columns = len; 120 } 121 fprintf(stderr, " %s", ep->name); 122 } 123 fprintf(stderr, "\n"); 124 exit(1); 125 } 126 127 /* end of crunched_main.c */ 128