Infrastructure, first drop of toy shell, and a bit of work on df.
[platform/upstream/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         {"toysh", toysh_main, TOYFLAG_BIN}
21 };
22
23 #define TOY_LIST_LEN (sizeof(toy_list)/sizeof(struct toy_list))
24
25 // global context for this applet.
26
27 struct toy_context toys;
28
29 struct toy_list *toy_find(char *name)
30 {
31         int top, bottom, middle;
32
33         // If the name starts with "toybox", accept that as a match.  Otherwise
34         // skip the first entry, which is out of order.
35
36         if (!strncmp(name,"toybox",6)) return toy_list;
37         bottom = 1;
38
39         // Binary search to find this applet.
40
41         top = TOY_LIST_LEN-1;
42         for (;;) {
43                 int result;
44                 
45                 middle = (top+bottom)/2;
46                 if (middle<bottom || middle>top) return NULL;
47                 result = strcmp(name,toy_list[middle].name);
48                 if (!result) return toy_list+middle;
49                 if (result<0) top=--middle;
50                 else bottom = ++middle;
51         }
52 }
53
54 // Run a toy.
55 void toy_exec(char *argv[])
56 {
57         struct toy_list *which;
58         
59         which = toy_find(argv[0]);
60         if (!which) return;
61
62         // Free old toys contents here?
63
64         toys.which = which;
65         toys.argv = argv;
66         for (toys.argc = 0; argv[toys.argc]; toys.argc++);
67         toys.exitval = 1;
68         
69         exit(toys.which->toy_main());
70 }
71
72 int toybox_main(void)
73 {
74         static char *toy_paths[]={"usr/","bin/","sbin/",0};
75         int i, len = 0;
76
77         if (toys.argv[1]) {
78                 if (toys.argv[1][0]!='-') {
79                         toy_exec(toys.argv+1);
80                         error_exit("No behavior for %s\n",toys.argv[1]);
81                 }
82         }
83
84         // Output list of applets.
85         for (i=1; i<TOY_LIST_LEN; i++) {
86                 int fl = toy_list[i].flags;
87                 if (fl & TOYMASK_LOCATION) {
88                         if (toys.argv[1]) {
89                                 int j;
90                                 for (j=0; toy_paths[j]; j++)
91                                         if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
92                         }
93                         len += printf("%s ",toy_list[i].name);
94                         if (len>65) {
95                                 putchar('\n');
96                                 len=0;
97                         }
98                 }
99         }
100         putchar('\n');
101         return 0;
102 }
103
104 int main(int argc, char *argv[])
105 {
106         char *name;
107
108         // Figure out which applet to call.
109         name = rindex(argv[0], '/');
110         if (!name) name=argv[0];
111         else name++;
112         argv[0] = name;
113
114         toys.argv = argv-1;
115         return toybox_main();
116 }