1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* vi: set ts=4 :*/
/* Toybox infrastructure.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*
* Licensed under GPL version 2, see file LICENSE in this tarball for details.
*/
#include <stdio.h>
#include <strings.h>
/*
name
main()
struct
usage (short long example info)
path (/usr/sbin)
*/
int toybox_main(void)
{
printf("toybox\n");
return 0;
}
int toysh_main(void)
{
printf("toysh\n");
}
// The monster fun applet list.
struct toy_list {
char *name;
int (*toy_main)(void);
} toy_list[] = {
{"toybox", toybox_main},
{"toysh", toysh_main}
};
// Global context for this applet.
struct toy_context {
struct toy_list *which;
int argc;
char **argv;
char buf[4096];
// toy_union toydata;
} toys;
struct toy_list *find_toy_by_name(char *name)
{
int top, bottom, middle;
// If the name starts with "toybox", accept that as a match. Otherwise
// skip the first entry, which is out of order.
if (!strncmp(name,"toybox",6)) return toy_list;
bottom=1;
// Binary search to find this applet.
top=(sizeof(toy_list)/sizeof(struct toy_list))-1;
for(;;) {
int result;
middle=(top+bottom)/2;
if(middle<bottom || middle>top) return NULL;
result = strcmp(name,toy_list[middle].name);
if(!result) return toy_list+middle;
if(result<0) top=--middle;
else bottom=++middle;
}
}
int main(int argc, char *argv[])
{
char *name;
// Record command line arguments.
toys.argc = argc;
toys.argv = argv;
// Figure out which applet got called.
name = rindex(argv[0],'/');
if (!name) name = argv[0];
else name++;
toys.which = find_toy_by_name(name);
if (!toys.which) {
dprintf(2,"No behavior for %s\n",name);
return 1;
}
return toys.which->toy_main();
}
|
