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Add a hello world applet, partly as an example and partly for testing purposes.
[android-x86/external-toybox.git] / main.c
1 /* vi: set ts=4 :*/
2 /* Toybox infrastructure.
3  *
4  * Copyright 2006 Rob Landley <rob@landley.net>
5  *
6  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
7  */
8
9 #include "toys.h"
10
11 // The monster fun applet list.
12
13 struct toy_list toy_list[] = {
14         // This one is out of order on purpose.
15         {"toybox", toybox_main, 0},
16         // The rest of these are alphabetical, for binary search.
17         {"cd", cd_main, TOYFLAG_NOFORK},
18         {"df", df_main, TOYFLAG_USR|TOYFLAG_SBIN},
19         {"exit", exit_main, TOYFLAG_NOFORK},
20         {"hello", hello_main, TOYFLAG_NOFORK|TOYFLAG_USR},
21         {"sh", toysh_main, TOYFLAG_BIN},
22         {"toysh", toysh_main, TOYFLAG_BIN}
23 };
24
25 #define TOY_LIST_LEN (sizeof(toy_list)/sizeof(struct toy_list))
26
27 // global context for this applet.
28
29 struct toy_context toys;
30
31 struct toy_list *toy_find(char *name)
32 {
33         int top, bottom, middle;
34
35         // If the name starts with "toybox", accept that as a match.  Otherwise
36         // skip the first entry, which is out of order.
37
38         if (!strncmp(name,"toybox",6)) return toy_list;
39         bottom = 1;
40
41         // Binary search to find this applet.
42
43         top = TOY_LIST_LEN-1;
44         for (;;) {
45                 int result;
46                 
47                 middle = (top+bottom)/2;
48                 if (middle<bottom || middle>top) return NULL;
49                 result = strcmp(name,toy_list[middle].name);
50                 if (!result) return toy_list+middle;
51                 if (result<0) top=--middle;
52                 else bottom = ++middle;
53         }
54 }
55
56 void toy_init(struct toy_list *which, char *argv[])
57 {
58         // Free old toys contents here?
59
60         toys.which = which;
61         toys.argv = argv;
62         toys.exitval = 1;
63 }
64
65 // Run a toy.
66 void toy_exec(char *argv[])
67 {
68         struct toy_list *which;
69         
70         which = toy_find(argv[0]);
71         if (!which) return;
72
73         toy_init(which, argv);
74         
75         exit(toys.which->toy_main());
76 }
77
78 int toybox_main(void)
79 {
80         static char *toy_paths[]={"usr/","bin/","sbin/",0};
81         int i, len = 0;
82
83         if (toys.argv[1]) {
84                 if (toys.argv[1][0]!='-') {
85                         toy_exec(toys.argv+1);
86                         error_exit("No behavior for %s\n",toys.argv[1]);
87                 }
88         }
89
90         // Output list of applets.
91         for (i=1; i<TOY_LIST_LEN; i++) {
92                 int fl = toy_list[i].flags;
93                 if (fl & TOYMASK_LOCATION) {
94                         if (toys.argv[1]) {
95                                 int j;
96                                 for (j=0; toy_paths[j]; j++)
97                                         if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
98                         }
99                         len += printf("%s ",toy_list[i].name);
100                         if (len>65) {
101                                 putchar('\n');
102                                 len=0;
103                         }
104                 }
105         }
106         putchar('\n');
107         return 0;
108 }
109
110 int main(int argc, char *argv[])
111 {
112         char *name;
113
114         // Figure out which applet to call.
115         name = rindex(argv[0], '/');
116         if (!name) name=argv[0];
117         else name++;
118         argv[0] = name;
119
120         toys.argv = argv-1;
121         return toybox_main();
122 }