usr.sbin/crunch/crunchgen/crunched_main.c

   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: src/usr.sbin/crunch/crunchgen/crunched_main.c,v 1.6.6.2 2002/08/09 02:42:02 gshapiro Exp $
  27  * $DragonFly: src/usr.sbin/crunch/crunchgen/crunched_main.c,v 1.3 2003/11/16 14:10:44 eirikn Exp $
  28  */
  29 /*
  30  * crunched_main.c - main program for crunched binaries, it branches to a
  31  *      particular subprogram based on the value of argv[0].  Also included
  32  *      is a little program invoked when the crunched binary is called via
  33  *      its EXECNAME.  This one prints out the list of compiled-in binaries,
  34  *      or calls one of them based on argv[1].   This allows the testing of
  35  *      the crunched binary without creating all the links.
  36  */
  37 #include <stdio.h>
  38 #include <string.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)) 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     struct stub *ep;
  91     int columns, len;
  92
  93     if(argc <= 1)
  94         crunched_usage();
  95
  96     return main(--argc, ++argv, envp);
  97 }
  98
  99
 100 int
 101 crunched_usage(void)
 102 {
 103     int columns, len;
 104     struct stub *ep;
 105
 106     fprintf(stderr, "usage: %s <prog> <args> ..., where <prog> is one of:\n",
 107             EXECNAME);
 108     columns = 0;
 109     for(ep=entry_points; ep->name != NULL; ep++) {
 110         len = strlen(ep->name) + 1;
 111         if(columns+len < 80)
 112             columns += len;
 113         else {
 114             fprintf(stderr, "\n");
 115             columns = len;
 116         }
 117         fprintf(stderr, " %s", ep->name);
 118     }
 119     fprintf(stderr, "\n");
 120     exit(1);
 121 }
 122
 123 /* end of crunched_main.c */
 124