annotate main.c @ 65:329e2b37d0e1

Save 4 bytes of stack space.
author Rob Landley <rob@landley.net>
date Thu, 18 Jan 2007 22:00:46 -0500
parents 41d55b5d49fd
children 021fe1a818c3
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
1
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
7 #include "toys.h"
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
8
21
6475d6c46066 Add pwd. Consolidate toy list information under toylist.h.
Rob Landley <rob@landley.net>
parents: 20
diff changeset
9 // Populate toy_list[].
1
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
10
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
11 struct toy_list toy_list[] = {
21
6475d6c46066 Add pwd. Consolidate toy list information under toylist.h.
Rob Landley <rob@landley.net>
parents: 20
diff changeset
12 #define FROM_MAIN
6475d6c46066 Add pwd. Consolidate toy list information under toylist.h.
Rob Landley <rob@landley.net>
parents: 20
diff changeset
13 #include "toys/toylist.h"
1
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
14 };
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
15
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
16 #define TOY_LIST_LEN (sizeof(toy_list)/sizeof(struct toy_list))
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
17
1
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
18 // global context for this applet.
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
19
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
20 struct toy_context toys;
53
41d55b5d49fd Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents: 25
diff changeset
21 char toybuf[4096];
1
59d58fab67c6 Next snapshot. Tries to grab something out of lib in order to build, I have
landley@driftwood
parents: 0
diff changeset
22
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
23 struct toy_list *toy_find(char *name)
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 int top, bottom, middle;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
26
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
27 // 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
28 // 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
29
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
30 if (!strncmp(name,"toybox",6)) return toy_list;
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
31 bottom = 1;
0
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 // Binary search to find this applet.
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
34
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
35 top = TOY_LIST_LEN-1;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
36 for (;;) {
0
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
37 int result;
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
38
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
39 middle = (top+bottom)/2;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
40 if (middle<bottom || middle>top) return NULL;
0
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
41 result = strcmp(name,toy_list[middle].name);
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
42 if (!result) return toy_list+middle;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
43 if (result<0) top=--middle;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
44 else bottom = ++middle;
0
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
45 }
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
46 }
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
47
3
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
48 void toy_init(struct toy_list *which, char *argv[])
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
49 {
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
50 // Free old toys contents here?
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
51
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
52 toys.which = which;
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
53 toys.argv = argv;
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
54 toys.exitval = 1;
25
eb46bb5626cb New option parsing infrastructure (doesn't use getopt). Hook it up to
Rob Landley <rob@landley.net>
parents: 21
diff changeset
55 if (which->options) get_optflags();
3
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
56 }
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
57
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
58 // Run a toy.
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
59 void toy_exec(char *argv[])
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
60 {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
61 struct toy_list *which;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
62
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
63 which = toy_find(argv[0]);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
64 if (!which) return;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
65
3
266a462ed18c Next drop of toysh, plus more infratructure.
landley@driftwood
parents: 2
diff changeset
66 toy_init(which, argv);
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
67
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
68 exit(toys.which->toy_main());
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
69 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
70
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
71 int toybox_main(void)
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
72 {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
73 static char *toy_paths[]={"usr/","bin/","sbin/",0};
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
74 int i, len = 0;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
75
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
76 if (toys.argv[1]) {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
77 if (toys.argv[1][0]!='-') {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
78 toy_exec(toys.argv+1);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
79 error_exit("No behavior for %s\n",toys.argv[1]);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
80 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
81 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
82
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
83 // Output list of applets.
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
84 for (i=1; i<TOY_LIST_LEN; i++) {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
85 int fl = toy_list[i].flags;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
86 if (fl & TOYMASK_LOCATION) {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
87 if (toys.argv[1]) {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
88 int j;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
89 for (j=0; toy_paths[j]; j++)
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
90 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
91 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
92 len += printf("%s ",toy_list[i].name);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
93 if (len>65) {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
94 putchar('\n');
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
95 len=0;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
96 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
97 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
98 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
99 putchar('\n');
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
100 return 0;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
101 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
102
0
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
103 int main(int argc, char *argv[])
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
104 {
65
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
105 // Artificial scope to eat less stack for things we call
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
106 {
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
107 char *name;
0
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
108
65
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
109 // Figure out which applet to call.
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
110 name = rindex(argv[0], '/');
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
111 if (!name) name=argv[0];
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
112 else name++;
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
113 argv[0] = name;
329e2b37d0e1 Save 4 bytes of stack space.
Rob Landley <rob@landley.net>
parents: 53
diff changeset
114 }
0
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
115
2
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
116 toys.argv = argv-1;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
landley@driftwood
parents: 1
diff changeset
117 return toybox_main();
0
e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
landley@driftwood
parents:
diff changeset
118 }