Accomodate older glibc, which also lacks the module syscalls
[platform/upstream/busybox.git] / applets.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Utility routines.
4  *
5  * Copyright (C) tons of folks.  Tracking down who wrote what
6  * isn't something I'm going to worry about...  If you wrote something
7  * here, please feel free to acknowledge your work.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  *
23  * Based in part on code from sash, Copyright (c) 1999 by David I. Bell 
24  * Permission has been granted to redistribute this code under the GPL.
25  *
26  */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include "busybox.h"
32
33 #undef APPLET
34 #undef APPLET_NOUSAGE
35 #undef PROTOTYPES
36 #include "applets.h"
37
38 struct BB_applet *applet_using;
39
40 /* The -1 arises because of the {0,NULL,0,-1} entry above. */
41 const size_t NUM_APPLETS = (sizeof (applets) / sizeof (struct BB_applet) - 1);
42
43 extern void show_usage(void)
44 {
45         const char *format_string;
46         const char *usage_string = usage_messages;
47         int i;
48
49         for (i = applet_using - applets; i > 0; ) {
50                 if (!*usage_string++) {
51                         --i;
52                 }
53         }
54         format_string = "%s\n\nUsage: %s %s\n\n";
55         if(*usage_string == 0)
56                 format_string = "%s\n\nNo help available.\n\n";
57         fprintf(stderr, format_string,
58                         full_version, applet_using->name, usage_string);
59         exit(EXIT_FAILURE);
60 }
61
62 static int applet_name_compare(const void *x, const void *y)
63 {
64         const char *name = x;
65         const struct BB_applet *applet = y;
66
67         return strcmp(name, applet->name);
68 }
69
70 extern const size_t NUM_APPLETS;
71
72 struct BB_applet *find_applet_by_name(const char *name)
73 {
74         return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
75                         applet_name_compare);
76 }
77
78 void run_applet_by_name(const char *name, int argc, char **argv)
79 {
80         static int recurse_level = 0;
81         extern int been_there_done_that; /* From busybox.c */
82
83         recurse_level++;
84         /* Do a binary search to find the applet entry given the name. */
85         if ((applet_using = find_applet_by_name(name)) != NULL) {
86                 applet_name = applet_using->name;
87                 if (argv[1] && strcmp(argv[1], "--help") == 0) {
88                         if (strcmp(applet_using->name, "busybox")==0) {
89                                 if(argv[2])
90                                   applet_using = find_applet_by_name(argv[2]);
91                                  else
92                                   applet_using = NULL;
93                         }
94                         if(applet_using)
95                                 show_usage();
96                         been_there_done_that=1;
97                         busybox_main(0, NULL);
98                 }
99                 exit((*(applet_using->main)) (argc, argv));
100         }
101         /* Just in case they have renamed busybox - Check argv[1] */
102         if (recurse_level == 1) {
103                 run_applet_by_name("busybox", argc, argv);
104         }
105         recurse_level--;
106 }
107
108
109 /* END CODE */
110 /*
111 Local Variables:
112 c-file-style: "linux"
113 c-basic-offset: 4
114 tab-width: 4
115 End:
116 */