annotate toys/main.c @ 0:e651a31d5416

Starting a new project. Just a bit past the "hello world" stage...
author landley@driftwood
date Wed, 27 Sep 2006 00:45:05 -0400
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
1 /* vi: set ts=4 :*/
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
2 /* Toybox infrastructure.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
3 *
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
4 * Copyright 2006 Rob Landley <rob@landley.net>
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
5 *
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
6 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
7 */
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
8
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
9 #include <stdio.h>
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
10 #include <strings.h>
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
11
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
12 /*
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
13 name
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
14 main()
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
15 struct
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
16 usage (short long example info)
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
17 path (/usr/sbin)
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
18 */
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
19
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
20 int toybox_main(void)
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
21 {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
22 printf("toybox\n");
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
23 return 0;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
24 }
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
25
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
26 int toysh_main(void)
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
27 {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
28 printf("toysh\n");
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
29 }
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
30
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
31 // The monster fun applet list.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
32
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
33 struct toy_list {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
34 char *name;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
35 int (*toy_main)(void);
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
36 } toy_list[] = {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
37 {"toybox", toybox_main},
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
38 {"toysh", toysh_main}
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
39 };
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
40
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
41 // Global context for this applet.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
42
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
43 struct toy_context {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
44 struct toy_list *which;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
45 int argc;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
46 char **argv;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
47 char buf[4096];
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
48 // toy_union toydata;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
49 } toys;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
50
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
51 struct toy_list *find_toy_by_name(char *name)
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
52 {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
53 int top, bottom, middle;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
54
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
55 // If the name starts with "toybox", accept that as a match. Otherwise
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
56 // skip the first entry, which is out of order.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
57
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
58 if (!strncmp(name,"toybox",6)) return toy_list;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
59 bottom=1;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
60
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
61 // Binary search to find this applet.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
62
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
63 top=(sizeof(toy_list)/sizeof(struct toy_list))-1;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
64 for(;;) {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
65 int result;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
66
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
67 middle=(top+bottom)/2;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
68 if(middle<bottom || middle>top) return NULL;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
69 result = strcmp(name,toy_list[middle].name);
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
70 if(!result) return toy_list+middle;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
71 if(result<0) top=--middle;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
72 else bottom=++middle;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
73 }
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
74 }
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
75
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
76 int main(int argc, char *argv[])
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
77 {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
78 char *name;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
79
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
80 // Record command line arguments.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
81 toys.argc = argc;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
82 toys.argv = argv;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
83
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
84 // Figure out which applet got called.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
85 name = rindex(argv[0],'/');
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
86 if (!name) name = argv[0];
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
87 else name++;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
88 toys.which = find_toy_by_name(name);
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
89
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
90 if (!toys.which) {
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
91 dprintf(2,"No behavior for %s\n",name);
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
92 return 1;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
93 }
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
94 return toys.which->toy_main();
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
95 }