Mercurial > hg > toybox
annotate www/code.html @ 589:7013fd450ff4
Changed my mind about the design again, now callback is dirtree_opennode() and recursion choice is how caller interprets flags.
author | Rob Landley <rob@landley.net> |
---|---|
date | Fri, 01 Jun 2012 20:27:51 -0500 |
parents | 2c1cb0d35031 |
children | 1a368546afd9 |
rev | line source |
---|---|
200 | 1 <!--#include file="header.html" --> |
2 | |
529 | 3 <p><h1>Code style</h1></p> |
505
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
4 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
5 <p>The primary goal of toybox is _simple_ code. Keeping the code small is |
529 | 6 second, with speed and lots of features coming in somewhere after that. |
7 (For more on that, see the <a href=design.html>design</a> page.)</p> | |
505
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
8 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
9 <p>A simple implementation usually takes up fewer lines of source code, |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
10 meaning more code can fit on the screen at once, meaning the programmer can |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
11 see more of it on the screen and thus keep more if in their head at once. |
529 | 12 This helps code auditing and thus reduces bugs. That said, sometimes being |
13 more explicit is preferable to being clever enough to outsmart yourself: | |
14 don't be so terse your code is unreadable.</p> | |
217 | 15 |
16 <p>Toybox source is formatted to be read with 4-space tab stops. Each file | |
17 starts with a special comment telling vi to set the tab stop to 4. Note that | |
18 one of the bugs in Ubuntu 7.10 broke vi's ability to parse these comments; you | |
19 must either rebuild vim from source, or go ":ts=4" yourself each time you load | |
20 the file.</p> | |
21 | |
22 <p>Gotos are allowed for error handling, and for breaking out of | |
23 nested loops. In general, a goto should only jump forward (not back), and | |
24 should either jump to the end of an outer loop, or to error handling code | |
25 at the end of the function. Goto labels are never indented: they override the | |
26 block structure of the file. Putting them at the left edge makes them easy | |
27 to spot as overrides to the normal flow of control, which they are.</p> | |
28 | |
505
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
29 <p><h1>Building Toybox:</h1></p> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
30 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
31 <p>Toybox is configured using the Kconfig language pioneered by the Linux |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
32 kernel, and adopted by many other projects (uClibc, OpenEmbedded, etc). |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
33 This generates a ".config" file containing the selected options, which |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
34 controls which features to enable when building toybox.</p> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
35 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
36 <p>Each configuration option has a default value. The defaults indicate the |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
37 "maximum sane configuration", I.E. if the feature defaults to "n" then it |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
38 either isn't complete or is a special-purpose option (such as debugging |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
39 code) that isn't intended for general purpose use.</p> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
40 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
41 <p>The standard build invocation is:</p> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
42 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
43 <ul> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
44 <li>make defconfig #(or menuconfig)</li> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
45 <li>make</li> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
46 <li>make install</li> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
47 </ul> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
48 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
49 <p>Type "make help" to see all available build options.</p> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
50 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
51 <p>The file "configure" contains a number of environment variable definitions |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
52 which influence the build, such as specifying which compiler to use or where |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
53 to install the resulting binaries. This file is included by the build, but |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
54 accepts existing definitions of the environment variables, so it may be sourced |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
55 or modified by the developer before building and the definitions exported |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
56 to the environment will take precedence.</p> |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
57 |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
58 <p>(To clarify: "configure" describes the build and installation environment, |
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
59 ".config" lists the features selected by defconfig/menuconfig.)</p> |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
60 |
200 | 61 <p><h1>Infrastructure:</h1></p> |
62 | |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
63 <p>The toybox source code is in following directories:</p> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
64 <ul> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
65 <li>The <a href="#top">top level directory</a> contains the file main.c (were |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
66 execution starts), the header file toys.h (included by every command), and |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
67 other global infrastructure.</li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
68 <li>The <a href="#lib">lib directory</a> contains common functions shared by |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
69 multiple commands.</li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
70 <li>The <a href="#toys">toys directory</a> contains the C files implementating |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
71 each command.</li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
72 <li>The <a href="#scripts">scripts directory</a> contains the build and |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
73 test infrastructure.</li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
74 <li>The <a href="#kconfig">kconfig directory</a> contains the configuration |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
75 infrastructure implementing menuconfig (copied from the Linux kernel).</li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
76 <li>The <a href="#generated">generated directory</a> contains intermediate |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
77 files generated from other parts of the source code.</li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
78 </ul> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
79 |
501
8abb9e307d0c
Web page tweaks. Remove background image (makes it hard ot read for some people), and use local roadmap instead of third party wiki.
Rob Landley <rob@landley.net>
parents:
432
diff
changeset
|
80 <a name="adding" /> |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
81 <p><h1>Adding a new command</h1></p> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
82 <p>To add a new command to toybox, add a C file implementing that command to |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
83 the toys directory. No other files need to be modified; the build extracts |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
84 all the information it needs (such as command line arguments) from specially |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
85 formatted comments and macros in the C file. (See the description of the |
505
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
86 <a href="#generated">"generated" directory</a> for details.)</p> |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
87 |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
88 <p>An easy way to start a new command is copy the file "hello.c" to |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
89 the name of the new command, and modify this copy to implement the new command. |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
90 This file is an example command meant to be used as a "skeleton" for |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
91 new commands (more or less by turning every instance of "hello" into the |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
92 name of your command, updating the command line arguments, globals, and |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
93 help data, and then filling out its "main" function with code that does |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
94 something interesting). It provides examples of all the build infrastructure |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
95 (including optional elements like command line argument parsing and global |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
96 variables that a "hello world" program doesn't strictly need).</p> |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
97 |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
98 <p>Here's a checklist of steps to turn hello.c into another command:</p> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
99 |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
100 <ul> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
101 <li><p>First "cd toys" and "cp hello.c yourcommand.c". Note that the name |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
102 of this file is significant, it's the name of the new command you're adding |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
103 to toybox. Open your new file in your favorite editor.</p></li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
104 |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
105 <li><p>Change the one line comment at the top of the file (currently |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
106 "hello.c - A hello world program") to describe your new file.</p></li> |
200 | 107 |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
108 <li><p>Change the copyright notice to your name, email, and the current |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
109 year.</p></li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
110 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
111 <li><p>Give a URL to the relevant standards document, or say "Not in SUSv4" if |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
112 there is no relevant standard. (Currently both lines are there, delete |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
113 whichever is inappropriate.) The existing link goes to the directory of SUSv4 |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
114 command line utility standards on the Open Group's website, where there's often |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
115 a relevant commandname.html file. Feel free to link to other documentation or |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
116 standards as appropriate.</p></li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
117 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
118 <li><p>Update the USE_YOURCOMMAND(NEWTOY(yourcommand,"blah",0)) line. |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
119 The NEWTOY macro fills out this command's <a href="#toy_list">toy_list</a> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
120 structure. The arguments to the NEWTOY macro are:</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
121 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
122 <ol> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
123 <li><p>the name used to run your command</p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
124 <li><p>the command line argument <a href="#lib_args">option parsing string</a> (NULL if none)</p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
125 <li><p>a bitfield of TOYFLAG values |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
126 (defined in toys.h) providing additional information such as where your |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
127 command should be installed on a running system, whether to blank umask |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
128 before running, whether or not the command must run as root (and thus should |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
129 retain root access if installed SUID), and so on.</p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
130 </ol> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
131 </li> |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
132 |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
133 <li><p>Change the kconfig data (from "config YOURCOMMAND" to the end of the |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
134 comment block) to supply your command's configuration and help |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
135 information. The uppper case config symbols are used by menuconfig, and are |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
136 also what the CFG_ and USE_() macros are generated from (see [TODO]). The |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
137 help information here is used by menuconfig, and also by the "help" command to |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
138 describe your new command. (See [TODO] for details.) By convention, |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
139 unfinished commands default to "n" and finished commands default to "y", |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
140 so "make defconfig" selects all finished commands. (Note, "finished" means |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
141 "ready to be used", not that it'll never change again.)<p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
142 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
143 <p>Each help block should start with a "usage: yourcommand" line explaining |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
144 any command line arguments added by this config option. The "help" command |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
145 outputs this text, and scripts/config2help.c in the build infrastructure |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
146 collates these usage lines for commands with multiple configuration |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
147 options when producing generated/help.h.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
148 </li> |
200 | 149 |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
150 <li><p>Update the DEFINE_GLOBALS() macro to contain your command's global |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
151 variables, and also change the name "hello" in the #define TT line afterwards |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
152 to the name of your command. If your command has no global variables, delete |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
153 this macro (and the #define TT line afterwards). Note that if you specified |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
154 two-character command line arguments in NEWTOY(), the first few global |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
155 variables will be initialized by the automatic argument parsing logic, and |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
156 the type and order of these variables must correspond to the arguments |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
157 specified in NEWTOY(). See [TODO] for details.</p></li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
158 |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
159 <li><p>If you didn't delete the DEFINE_GLOBALS macro, change the "#define TT |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
160 this.hello" line to use your command name in place of the "hello". This is a |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
161 shortcut to access your global variables as if they were members of the global |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
162 struct "TT". (Access these members with a period ".", not a right arrow |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
163 "->".)</p></li> |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
164 |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
165 <li><p>Rename hello_main() to yourcommand_main(). This is the main() function |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
166 where execution of your command starts. See [TODO] to figure out what |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
167 happened to your command line arguments and how to access them.</p></li> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
168 </ul> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
169 |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
170 <p><a name="top" /><h2>Top level directory.</h2></p> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
171 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
172 <p>This directory contains global infrastructure.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
173 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
174 <h3>toys.h</h3> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
175 <p>Each command #includes "toys.h" as part of its standard prolog.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
176 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
177 <p>This file sucks in most of the commonly used standard #includes, so |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
178 individual files can just #include "toys.h" and not have to worry about |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
179 stdargs.h and so on. Individual commands still need to #include |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
180 special-purpose headers that may not be present on all systems (and thus would |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
181 prevent toybox from building that command on such a system with that command |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
182 enabled). Examples include regex support, any "linux/" or "asm/" headers, mtab |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
183 support (mntent.h and sys/mount.h), and so on.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
184 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
185 <p>The toys.h header also defines structures for most of the global variables |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
186 provided to each command by toybox_main(). These are described in |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
187 detail in the description for main.c, where they are initialized.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
188 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
189 <p>The global variables are grouped into structures (and a union) for space |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
190 savings, to more easily track the amount of memory consumed by them, |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
191 so that they may be automatically cleared/initialized as needed, and so |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
192 that access to global variables is more easily distinguished from access to |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
193 local variables.</p> |
200 | 194 |
195 <h3>main.c</h3> | |
196 <p>Contains the main() function where execution starts, plus | |
197 common infrastructure to initialize global variables and select which command | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
198 to run. The "toybox" multiplexer command also lives here. (This is the |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
199 only command defined outside of the toys directory.)</p> |
200 | 200 |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
201 <p>Execution starts in main() which trims any path off of the first command |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
202 name and calls toybox_main(), which calls toy_exec(), which calls toy_find() |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
203 and toy_init() before calling the appropriate command's function from |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
204 toy_list[] (via toys.which->toy_main()). |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
205 If the command is "toybox", execution recurses into toybox_main(), otherwise |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
206 the call goes to the appropriate commandname_main() from a C file in the toys |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
207 directory.</p> |
200 | 208 |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
209 <p>The following global variables are defined in main.c:</p> |
200 | 210 <ul> |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
211 <a name="toy_list" /> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
212 <li><p><b>struct toy_list toy_list[]</b> - array describing all the |
200 | 213 commands currently configured into toybox. The first entry (toy_list[0]) is |
214 for the "toybox" multiplexer command, which runs all the other built-in commands | |
215 without symlinks by using its first argument as the name of the command to | |
216 run and the rest as that command's argument list (ala "./toybox echo hello"). | |
217 The remaining entries are the commands in alphabetical order (for efficient | |
218 binary search).</p> | |
219 | |
220 <p>This is a read-only array initialized at compile time by | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
221 defining macros and #including generated/newtoys.h.</p> |
200 | 222 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
223 <p>Members of struct toy_list (defined in "toys.h") include:</p> |
200 | 224 <ul> |
225 <li><p>char *<b>name</b> - the name of this command.</p></li> | |
226 <li><p>void (*<b>toy_main</b>)(void) - function pointer to run this | |
227 command.</p></li> | |
228 <li><p>char *<b>options</b> - command line option string (used by | |
229 get_optflags() in lib/args.c to intialize toys.optflags, toys.optargs, and | |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
230 entries in the toy's DEFINE_GLOBALS struct). When this is NULL, no option |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
231 parsing is done before calling toy_main().</p></li> |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
232 <li><p>int <b>flags</b> - Behavior flags for this command. The following flags are currently understood:</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
233 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
234 <ul> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
235 <li><b>TOYFLAG_USR</b> - Install this command under /usr</li> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
236 <li><b>TOYFLAG_BIN</b> - Install this command under /bin</li> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
237 <li><b>TOYFLAG_SBIN</b> - Install this command under /sbin</li> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
238 <li><b>TOYFLAG_NOFORK</b> - This command can be used as a shell builtin.</li> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
239 <li><b>TOYFLAG_UMASK</b> - Call umask(0) before running this command.</li> |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
240 <li><b>TOYFLAG_STAYROOT</b> - Don't drop permissions for this command if toybox is installed SUID root.</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
241 <li><b>TOYFLAG_NEEDROOT</b> - This command cannot function unless run with root access.</li> |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
242 </ul> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
243 <br> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
244 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
245 <p>These flags are combined with | (or). For example, to install a command |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
246 in /usr/bin, or together TOYFLAG_USR|TOYFLAG_BIN.</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
247 </ul> |
200 | 248 </li> |
249 | |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
250 <li><p><b>struct toy_context toys</b> - global structure containing information |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
251 common to all commands, initializd by toy_init() and defined in "toys.h". |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
252 Members of this structure include:</p> |
200 | 253 <ul> |
254 <li><p>struct toy_list *<b>which</b> - a pointer to this command's toy_list | |
255 structure. Mostly used to grab the name of the running command | |
256 (toys->which.name).</p> | |
257 </li> | |
258 <li><p>int <b>exitval</b> - Exit value of this command. Defaults to zero. The | |
259 error_exit() functions will return 1 if this is zero, otherwise they'll | |
260 return this value.</p></li> | |
261 <li><p>char **<b>argv</b> - "raw" command line options, I.E. the original | |
262 unmodified string array passed in to main(). Note that modifying this changes | |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
263 "ps" output, and is not recommended. This array is null terminated; a NULL |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
264 entry indicates the end of the array.</p> |
200 | 265 <p>Most commands don't use this field, instead the use optargs, optflags, |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
266 and the fields in the DEFINE_GLOBALS struct initialized by get_optflags().</p> |
200 | 267 </li> |
268 <li><p>unsigned <b>optflags</b> - Command line option flags, set by | |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
269 <a href="#lib_args">get_optflags()</a>. Indicates which of the command line options listed in |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
270 toys->which.options occurred this time.</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
271 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
272 <p>The rightmost command line argument listed in toys->which.options sets bit |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
273 1, the next one sets bit 2, and so on. This means the bits are set in the same |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
274 order the binary digits would be listed if typed out as a string. For example, |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
275 the option string "abcd" would parse the command line "-c" to set optflags to 2, |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
276 "-a" would set optflags to 8, and "-bd" would set optflags to 6 (4|2).</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
277 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
278 <p>Only letters are relevant to optflags. In the string "a*b:c#d", d=1, c=2, |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
279 b=4, a=8. The punctuation after a letter initializes global variables |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
280 (see [TODO] DECLARE_GLOBALS() for details).</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
281 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
282 <p>For more information on option parsing, see <a href="#lib_args">get_optflags()</a>.</p> |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
283 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
284 </li> |
200 | 285 <li><p>char **<b>optargs</b> - Null terminated array of arguments left over |
286 after get_optflags() removed all the ones it understood. Note: optarg[0] is | |
287 the first argument, not the command name. Use toys.which->name for the command | |
288 name.</p></li> | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
289 <li><p>int <b>optc</b> - Optarg count, equivalent to argc but for |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
290 optargs[].<p></li> |
200 | 291 <li><p>int <b>exithelp</b> - Whether error_exit() should print a usage message |
292 via help_main() before exiting. (True during option parsing, defaults to | |
293 false afterwards.)</p></li> | |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
294 </ul> |
200 | 295 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
296 <li><p><b>union toy_union this</b> - Union of structures containing each |
200 | 297 command's global variables.</p> |
298 | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
299 <p>Global variables are useful: they reduce the overhead of passing extra |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
300 command line arguments between functions, they conveniently start prezeroed to |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
301 save initialization costs, and the command line argument parsing infrastructure |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
302 can also initialize global variables with its results.</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
303 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
304 <p>But since each toybox process can only run one command at a time, allocating |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
305 space for global variables belonging to other commands you aren't currently |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
306 running would be wasteful.</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
307 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
308 <p>Toybox handles this by encapsulating each command's global variables in |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
309 a structure, and declaring a union of those structures with a single global |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
310 instance (called "this"). The DEFINE_GLOBALS() macro contains the global |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
311 variables that should go in the current command's global structure. Each |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
312 variable can then be accessed as "this.commandname.varname". |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
313 Generally, the macro TT is #defined to this.commandname so the variable |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
314 can then be accessed as "TT.variable". See toys/hello.c for an example.</p> |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
315 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
316 <p>A command that needs global variables should declare a structure to |
200 | 317 contain them all, and add that structure to this union. A command should never |
318 declare global variables outside of this, because such global variables would | |
319 allocate memory when running other commands that don't use those global | |
320 variables.</p> | |
321 | |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
322 <p>The first few fields of this structure can be intialized by <a href="#lib_args">get_optargs()</a>, |
200 | 323 as specified by the options field off this command's toy_list entry. See |
324 the get_optargs() description in lib/args.c for details.</p> | |
325 </li> | |
326 | |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
327 <li><b>char toybuf[4096]</b> - a common scratch space buffer so |
200 | 328 commands don't need to allocate their own. Any command is free to use this, |
329 and it should never be directly referenced by functions in lib/ (although | |
330 commands are free to pass toybuf in to a library function as an argument).</li> | |
331 </ul> | |
332 | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
333 <p>The following functions are defined in main.c:</p> |
200 | 334 <ul> |
335 <li><p>struct toy_list *<b>toy_find</b>(char *name) - Return the toy_list | |
336 structure for this command name, or NULL if not found.</p></li> | |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
337 <li><p>void <b>toy_init</b>(struct toy_list *which, char *argv[]) - fill out |
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
338 the global toys structure, calling get_optargs() if necessary.</p></li> |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
339 <li><p>void <b>toy_exec</b>(char *argv[]) - Run a built-in command with |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
340 arguments.</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
341 <p>Calls toy_find() on argv[0] (which must be just a command name |
200 | 342 without path). Returns if it can't find this command, otherwise calls |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
343 toy_init(), toys->which.toy_main(), and exit() instead of returning.</p> |
200 | 344 |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
345 <p>Use the library function xexec() to fall back to external executables |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
346 in $PATH if toy_exec() can't find a built-in command. Note that toy_exec() |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
347 does not strip paths before searching for a command, so "./command" will |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
348 never match an internal command.</li> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
349 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
350 <li><p>void <b>toybox_main</b>(void) - the main function for the multiplexer |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
351 command (I.E. "toybox"). Given a command name as its first argument, calls |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
352 toy_exec() on its arguments. With no arguments, it lists available commands. |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
353 If the first argument starts with "-" it lists each command with its default |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
354 install path prepended.</p></li> |
200 | 355 |
356 </ul> | |
357 | |
358 <h3>Config.in</h3> | |
359 | |
360 <p>Top level configuration file in a stylized variant of | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
361 <a href=http://kernel.org/doc/Documentation/kbuild/kconfig-language.txt>kconfig</a> format. Includes generated/Config.in.</p> |
200 | 362 |
363 <p>These files are directly used by "make menuconfig" to select which commands | |
364 to build into toybox (thus generating a .config file), and by | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
365 scripts/config2help.py to create generated/help.h.</p> |
200 | 366 |
367 <h3>Temporary files:</h3> | |
368 | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
369 <p>There is one temporary file in the top level source directory:</p> |
200 | 370 <ul> |
371 <li><p><b>.config</b> - Configuration file generated by kconfig, indicating | |
372 which commands (and options to commands) are currently enabled. Used | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
373 to make generated/config.h and determine which toys/*.c files to build.</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
374 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
375 <p>You can create a human readable "miniconfig" version of this file using |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
376 <a href=http://landley.net/aboriginal/new_platform.html#miniconfig>these |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
377 instructions</a>.</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
378 </li> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
379 </ul> |
200 | 380 |
505
c08cd17224c0
Make documentation even fluffier.
Rob Landley <rob@landley.net>
parents:
501
diff
changeset
|
381 <a name="generated" /> |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
382 <p>The "generated/" directory contains files generated from other source code |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
383 in toybox. All of these files can be recreated by the build system, although |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
384 some (such as generated/help.h) are shipped in release versions to reduce |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
385 environmental dependencies (I.E. so you don't need python on your build |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
386 system).</p> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
387 |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
388 <ul> |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
389 <li><p><b>generated/config.h</b> - list of CFG_SYMBOL and USE_SYMBOL() macros, |
200 | 390 generated from .config by a sed invocation in the top level Makefile.</p> |
391 | |
392 <p>CFG_SYMBOL is a comple time constant set to 1 for enabled symbols and 0 for | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
393 disabled symbols. This allows the use of normal if() statements to remove |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
394 code at compile time via the optimizer's dead code elimination (which removes |
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
395 from the binary any code that cannot be reached). This saves space without |
200 | 396 cluttering the code with #ifdefs or leading to configuration dependent build |
397 breaks. (See the 1992 Usenix paper | |
415
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
398 <a href=http://doc.cat-v.org/henry_spencer/ifdef_considered_harmful.pdf>#ifdef |
200 | 399 Considered Harmful</a> for more information.)</p> |
400 | |
401 <p>USE_SYMBOL(code) evaluates to the code in parentheses when the symbol | |
402 is enabled, and nothing when the symbol is disabled. This can be used | |
403 for things like varargs or variable declarations which can't always be | |
256
20f1e3da0492
Partial update. Needs more work.
Rob Landley <rob@landley.net>
parents:
239
diff
changeset
|
404 eliminated by a simple test on CFG_SYMBOL. Note that |
200 | 405 (unlike CFG_SYMBOL) this is really just a variant of #ifdef, and can |
406 still result in configuration dependent build breaks. Use with caution.</p> | |
407 </li> | |
408 </ul> | |
409 | |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
410 <p><h2>Directory toys/</h2></p> |
200 | 411 |
412 <h3>toys/Config.in</h3> | |
413 | |
414 <p>Included from the top level Config.in, contains one or more | |
415 configuration entries for each command.</p> | |
416 | |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
417 <p>Each command has a configuration entry matching the command name (although |
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
418 configuration symbols are uppercase and command names are lower case). |
200 | 419 Options to commands start with the command name followed by an underscore and |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
420 the option name. Global options are attached to the "toybox" command, |
200 | 421 and thus use the prefix "TOYBOX_". This organization is used by |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
422 scripts/cfg2files to select which toys/*.c files to compile for a given |
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
423 .config.</p> |
200 | 424 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
425 <p>A command with multiple names (or multiple similar commands implemented in |
200 | 426 the same .c file) should have config symbols prefixed with the name of their |
427 C file. I.E. config symbol prefixes are NEWTOY() names. If OLDTOY() names | |
428 have config symbols they're options (symbols with an underscore and suffix) | |
429 to the NEWTOY() name. (See toys/toylist.h)</p> | |
430 | |
431 <h3>toys/toylist.h</h3> | |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
432 <p>The first half of this file prototypes all the structures to hold |
213
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
433 global variables for each command, and puts them in toy_union. These |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
434 prototypes are only included if the macro NEWTOY isn't defined (in which |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
435 case NEWTOY is defined to a default value that produces function |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
436 prototypes).</p> |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
437 |
213
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
438 <p>The second half of this file lists all the commands in alphabetical |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
439 order, along with their command line arguments and install location. |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
440 Each command has an appropriate configuration guard so only the commands that |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
441 are enabled wind up in the list.</p> |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
442 |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
443 <p>The first time this header is #included, it defines structures and |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
444 produces function prototypes for the commands in the toys directory.</p> |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
445 |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
446 |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
447 <p>The first time it's included, it defines structures and produces function |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
448 prototypes. |
db91356e3c43
More random unfinished code documentation.
Rob Landley <rob@landley.net>
parents:
210
diff
changeset
|
449 This |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
450 is used to initialize toy_list in main.c, and later in that file to initialize |
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
451 NEED_OPTIONS (to figure out whether the command like parsing logic is needed), |
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
452 and to put the help entries in the right order in toys/help.c.</p> |
200 | 453 |
454 <h3>toys/help.h</h3> | |
455 | |
456 <p>#defines two help text strings for each command: a single line | |
457 command_help and an additinal command_help_long. This is used by help_main() | |
458 in toys/help.c to display help for commands.</p> | |
459 | |
460 <p>Although this file is generated from Config.in help entries by | |
461 scripts/config2help.py, it's shipped in release tarballs so you don't need | |
462 python on the build system. (If you check code out of source control, or | |
463 modify Config.in, then you'll need python installed to rebuild it.)</p> | |
464 | |
465 <p>This file contains help for all commands, regardless of current | |
466 configuration, but only the currently enabled ones are entered into help_data[] | |
467 in toys/help.c.</p> | |
468 | |
536
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
469 <a name="lib"> |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
470 <h2>Directory lib/</h2> |
200 | 471 |
536
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
472 <p>TODO: document lots more here.</p> |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
473 |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
474 <p>lib: llist, getmountlist(), error_msg/error_exit, xmalloc(), |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
475 strlcpy(), xexec(), xopen()/xread(), xgetcwd(), xabspath(), find_in_path(), |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
476 itoa().</p> |
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
477 |
536
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
478 <h3>lib/portability.h</h3> |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
479 |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
480 <p>This file is automatically included from the top of toys.h, and smooths |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
481 over differences between platforms (hardware targets, compilers, C libraries, |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
482 operating systems, etc).</p> |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
483 |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
484 <p>This file provides SWAP macros (SWAP_BE16(x) and SWAP_LE32(x) and so on).</p> |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
485 |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
486 <p>A macro like SWAP_LE32(x) means "The value in x is stored as a little |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
487 endian 32 bit value, so perform the translation to/from whatever the native |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
488 32-bit format is". You do the swap once on the way in, and once on the way |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
489 out. If your target is already little endian, the macro is a NOP.</p> |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
490 |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
491 <p>The SWAP macros come in BE and LE each with 16, 32, and 64 bit versions. |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
492 In each case, the name of the macro refers to the _external_ representation, |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
493 and converts to/from whatever your native representation happens to be (which |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
494 can vary depending on what you're currently compiling for).</p> |
2c1cb0d35031
Add lib/portability.h description with explanation of SWAP() macros.
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
495 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
496 <a name="lib_args"><h3>lib/args.c</h3> |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
497 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
498 <p>Toybox's main.c automatically parses command line options before calling the |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
499 command's main function. Option parsing starts in get_optflags(), which stores |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
500 results in the global structures "toys" (optflags and optargs) and "this".</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
501 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
502 <p>The option parsing infrastructure stores a bitfield in toys.optflags to |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
503 indicate which options the current command line contained. Arguments |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
504 attached to those options are saved into the command's global structure |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
505 ("this"). Any remaining command line arguments are collected together into |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
506 the null-terminated array toys.optargs, with the length in toys.optc. (Note |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
507 that toys.optargs does not contain the current command name at position zero, |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
508 use "toys.which->name" for that.) The raw command line arguments get_optflags() |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
509 parsed are retained unmodified in toys.argv[].</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
510 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
511 <p>Toybox's option parsing logic is controlled by an "optflags" string, using |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
512 a format reminiscent of getopt's optargs but has several important differences. |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
513 Toybox does not use the getopt() |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
514 function out of the C library, get_optflags() is an independent implementation |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
515 which doesn't permute the original arguments (and thus doesn't change how the |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
516 command is displayed in ps and top), and has many features not present in |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
517 libc optargs() (such as the ability to describe long options in the same string |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
518 as normal options).</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
519 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
520 <p>Each command's NEWTOY() macro has an optflags string as its middle argument, |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
521 which sets toy_list.options for that command to tell get_optflags() what |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
522 command line arguments to look for, and what to do with them. |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
523 If a command has no option |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
524 definition string (I.E. the argument is NULL), option parsing is skipped |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
525 for that command, which must look at the raw data in toys.argv to parse its |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
526 own arguments. (If no currently enabled command uses option parsing, |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
527 get_optflags() is optimized out of the resulting binary by the compiler's |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
528 --gc-sections option.)</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
529 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
530 <p>You don't have to free the option strings, which point into the environment |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
531 space (I.E. the string data is not copied). A TOYFLAG_NOFORK command |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
532 that uses the linked list type "*" should free the list objects but not |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
533 the data they point to, via "llist_free(TT.mylist, NULL);". (If it's not |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
534 NOFORK, exit() will free all the malloced data anyway unless you want |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
535 to implement a CONFIG_TOYBOX_FREE cleanup for it.)</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
536 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
537 <h4>Optflags format string</h4> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
538 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
539 <p>Note: the optflags option description string format is much more |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
540 concisely described by a large comment at the top of lib/args.c.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
541 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
542 <p>The general theory is that letters set optflags, and punctuation describes |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
543 other actions the option parsing logic should take.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
544 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
545 <p>For example, suppose the command line <b>command -b fruit -d walrus -a 42</b> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
546 is parsed using the optflags string "<b>a#b:c:d</b>". (I.E. |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
547 toys.which->options="a#b:c:d" and argv = ["command", "-b", "fruit", "-d", |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
548 "walrus", "-a", "42"]). When get_optflags() returns, the following data is |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
549 available to command_main(): |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
550 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
551 <ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
552 <li><p>In <b>struct toys</b>: |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
553 <ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
554 <li>toys.optflags = 13; // -a = 8 | -b = 4 | -d = 1</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
555 <li>toys.optargs[0] = "walrus"; // leftover argument</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
556 <li>toys.optargs[1] = NULL; // end of list</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
557 <li>toys.optc=1; // there was 1 leftover argument</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
558 <li>toys.argv[] = {"-b", "fruit", "-d", "walrus", "-a", "42"}; // The original command line arguments |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
559 </ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
560 <p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
561 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
562 <li><p>In <b>union this</b> (treated as <b>long this[]</b>): |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
563 <ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
564 <li>this[0] = NULL; // -c didn't get an argument this time, so get_optflags() didn't change it and toys_init() zeroed "this" during setup.)</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
565 <li>this[1] = (long)"fruit"; // argument to -b</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
566 <li>this[2] = 42; // argument to -a</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
567 </ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
568 </p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
569 </ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
570 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
571 <p>If the command's globals are:</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
572 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
573 <blockquote><pre> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
574 DECLARE_GLOBALS( |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
575 char *c; |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
576 char *b; |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
577 long a; |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
578 ) |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
579 #define TT this.command |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
580 </pre></blockquote> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
581 <p>That would mean TT.c == NULL, TT.b == "fruit", and TT.a == 42. (Remember, |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
582 each entry that receives an argument must be a long or pointer, to line up |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
583 with the array position. Right to left in the optflags string corresponds to |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
584 top to bottom in DECLARE_GLOBALS().</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
585 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
586 <p><b>long toys.optflags</b></p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
587 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
588 <p>Each option in the optflags string corresponds to a bit position in |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
589 toys.optflags, with the same value as a corresponding binary digit. The |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
590 rightmost argument is (1<<0), the next to last is (1<<1) and so on. If |
432
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
591 the option isn't encountered while parsing argv[], its bit remains 0.</p> |
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
592 |
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
593 <p>For example, |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
594 the optflags string "abcd" would parse the command line argument "-c" to set |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
595 optflags to 2, "-a" would set optflags to 8, "-bd" would set optflags to |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
596 6 (I.E. 4|2), and "-a -c" would set optflags to 10 (2|8).</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
597 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
598 <p>Only letters are relevant to optflags, punctuation is skipped: in the |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
599 string "a*b:c#d", d=1, c=2, b=4, a=8. The punctuation after a letter |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
600 usually indicate that the option takes an argument.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
601 |
432
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
602 <p>Since toys.optflags is an unsigned int, it only stores 32 bits. (Which is |
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
603 the amount a long would have on 32-bit platforms anyway; 64 bit code on |
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
604 32 bit platforms is too expensive to require in common code used by almost |
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
605 all commands.) Bit positions beyond the 1<<31 aren't recorded, but |
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
606 parsing higher options can still set global variables.</p> |
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
607 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
608 <p><b>Automatically setting global variables from arguments (union this)</b></p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
609 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
610 <p>The following punctuation characters may be appended to an optflags |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
611 argument letter, indicating the option takes an additional argument:</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
612 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
613 <ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
614 <li><b>:</b> - plus a string argument, keep most recent if more than one.</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
615 <li><b>*</b> - plus a string argument, appended to a linked list.</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
616 <li><b>@</b> - plus an occurrence counter (stored in a long)</li> |
415
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
617 <li><b>#</b> - plus a signed long argument. |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
618 <li><b>.</b> - plus a floating point argument (if CFG_TOYBOX_FLOAT).</li> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
619 <ul>The following can be appended to a float or double: |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
620 <li><b><123</b> - error if argument is less than this</li> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
621 <li><b>>123</b> - error if argument is greater than this</li> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
622 <li><b>=123</b> - default value if argument not supplied</li> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
623 </ul> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
624 <ul><li>Option parsing only understands <>= after . when CFG_TOYBOX_FLOAT |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
625 is enabled. (Otherwise the code to determine where floating point constants |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
626 end drops out. When disabled, it can reserve a global data slot for the |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
627 argument so offsets won't change, but will never fill it out.). You can handle |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
628 this by using the USE_BLAH() macros with C string concatenation, ala: |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
629 "abc." USE_TOYBOX_FLOAT("<1.23>4.56=7.89") "def"</li></ul> |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
630 </ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
631 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
632 <p>Arguments may occur with or without a space (I.E. "-a 42" or "-a42"). |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
633 The command line argument "-abc" may be interepreted many different ways: |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
634 the optflags string "cba" sets toys.optflags = 7, "c:ba" sets toys.optflags=4 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
635 and saves "ba" as the argument to -c, and "cb:a" sets optflags to 6 and saves |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
636 "c" as the argument to -b.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
637 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
638 <p>Options which have an argument fill in the corresponding slot in the global |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
639 union "this" (see generated/globals.h), treating it as an array of longs |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
640 with the rightmost saved in this[0]. Again using "a*b:c#d", "-c 42" would set |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
641 this[0]=42; and "-b 42" would set this[1]="42"; each slot is left NULL if |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
642 the corresponding argument is not encountered.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
643 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
644 <p>This behavior is useful because the LP64 standard ensures long and pointer |
432
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
645 are the same size. C99 guarantees structure members will occur in memory |
01473712c9fe
Document that optflags is always an int (so 32 bit and 64 bit platforms behave the same).
Rob Landley <rob@landley.net>
parents:
415
diff
changeset
|
646 in the same order they're declared, and that padding won't be inserted between |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
647 consecutive variables of register size. Thus the first few entries can |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
648 be longs or pointers corresponding to the saved arguments.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
649 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
650 <p><b>char *toys.optargs[]</b></p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
651 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
652 <p>Command line arguments in argv[] which are not consumed by option parsing |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
653 (I.E. not recognized either as -flags or arguments to -flags) will be copied |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
654 to toys.optargs[], with the length of that array in toys.optc. |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
655 (When toys.optc is 0, no unrecognized command line arguments remain.) |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
656 The order of entries is preserved, and as with argv[] this new array is also |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
657 terminated by a NULL entry.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
658 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
659 <p>Option parsing can require a minimum or maximum number of optargs left |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
660 over, by adding "<1" (read "at least one") or ">9" ("at most nine") to the |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
661 start of the optflags string.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
662 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
663 <p>The special argument "--" terminates option parsing, storing all remaining |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
664 arguments in optargs. The "--" itself is consumed.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
665 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
666 <p><b>Other optflags control characters</b></p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
667 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
668 <p>The following characters may occur at the start of each command's |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
669 optflags string, before any options that would set a bit in toys.optflags:</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
670 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
671 <ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
672 <li><b>^</b> - stop at first nonoption argument (for nice, xargs...)</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
673 <li><b>?</b> - allow unknown arguments (pass non-option arguments starting |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
674 with - through to optargs instead of erroring out).</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
675 <li><b>&</b> - the first argument has imaginary dash (ala tar/ps. If given twice, all arguments have imaginary dash.)</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
676 <li><b><</b> - must be followed by a decimal digit indicating at least this many leftover arguments are needed in optargs (default 0)</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
677 <li><b>></b> - must be followed by a decimal digit indicating at most this many leftover arguments allowed (default MAX_INT)</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
678 </ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
679 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
680 <p>The following characters may be appended to an option character, but do |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
681 not by themselves indicate an extra argument should be saved in this[]. |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
682 (Technically any character not recognized as a control character sets an |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
683 optflag, but letters are never control characters.)</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
684 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
685 <ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
686 <li><b>^</b> - stop parsing options after encountering this option, everything else goes into optargs.</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
687 <li><b>|</b> - this option is required. If more than one marked, only one is required.</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
688 <li><b>+X</b> enabling this option also enables option X (switch bit on).</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
689 <li><b>~X</b> enabling this option disables option X (switch bit off).</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
690 <li><b>!X</b> this option cannot be used in combination with X (die with error).</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
691 <li><b>[yz]</b> this option requires at least one of y or z to also be enabled.</li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
692 </ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
693 |
415
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
694 <p>The following may be appended to a float or double:</p> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
695 |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
696 <ul> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
697 <li><b><123</b> - error if argument is less than this</li> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
698 <li><b>>123</b> - error if argument is greater than this</li> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
699 <li><b>=123</b> - default value if argument not supplied</li> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
700 </ul> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
701 |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
702 <p>Option parsing only understands <>= after . when CFG_TOYBOX_FLOAT |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
703 is enabled. (Otherwise the code to determine where floating point constants |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
704 end drops out. When disabled, it can reserve a global data slot for the |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
705 argument so offsets won't change, but will never fill it out.). You can handle |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
706 this by using the USE_BLAH() macros with C string concatenation, ala:</p> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
707 |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
708 <blockquote>"abc." USE_TOYBOX_FLOAT("<1.23>4.56=7.89") "def"</blockquote> |
2cbbd4c5eaaa
Add <>= to lib/args.c, with documentation.
Rob Landley <rob@landley.net>
parents:
403
diff
changeset
|
709 |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
710 <p><b>--longopts</b></p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
711 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
712 <p>The optflags string can contain long options, which are enclosed in |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
713 parentheses. They may be appended to an existing option character, in |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
714 which case the --longopt is a synonym for that option, ala "a:(--fred)" |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
715 which understands "-a blah" or "--fred blah" as synonyms.</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
716 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
717 <p>Longopts may also appear before any other options in the optflags string, |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
718 in which case they have no corresponding short argument, but instead set |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
719 their own bit based on position. So for "(walrus)#(blah)xy:z" "command |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
720 --walrus 42" would set toys.optflags = 16 (-z = 1, -y = 2, -x = 4, --blah = 8) |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
721 and would assign this[1] = 42;</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
722 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
723 <p>A short option may have multiple longopt synonyms, "a(one)(two)", but |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
724 each "bare longopt" (ala "(one)(two)abc" before any option characters) |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
725 always sets its own bit (although you can group them with +X).</p> |
239
4f1ca01db000
Fluff out hello.c to supply more example code as a skeleton for new commands,
Rob Landley <rob@landley.net>
parents:
217
diff
changeset
|
726 |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
727 <h2>Directory scripts/</h2> |
200 | 728 |
729 <h3>scripts/cfg2files.sh</h3> | |
730 | |
731 <p>Run .config through this filter to get a list of enabled commands, which | |
732 is turned into a list of files in toys via a sed invocation in the top level | |
733 Makefile. | |
734 </p> | |
735 | |
210
a71c502a028c
Fluff out code.html a bit more.
Rob Landley <rob@landley.net>
parents:
200
diff
changeset
|
736 <h2>Directory kconfig/</h2> |
200 | 737 |
738 <p>Menuconfig infrastructure copied from the Linux kernel. See the | |
739 Linux kernel's Documentation/kbuild/kconfig-language.txt</p> | |
740 | |
403
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
741 <a name="generated"> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
742 <h2>Directory generated/</h2> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
743 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
744 <p>All the files in this directory except the README are generated by the |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
745 build. (See scripts/make.sh)</p> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
746 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
747 <ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
748 <li><p><b>config.h</b> - CFG_COMMAND and USE_COMMAND() macros set by menuconfig via .config.</p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
749 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
750 <li><p><b>Config.in</b> - Kconfig entries for each command. Included by top level Config.in. The help text in here is used to generated help.h</p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
751 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
752 <li><p><b>help.h</b> - Help text strings for use by "help" command. Building |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
753 this file requires python on the host system, so the prebuilt file is shipped |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
754 in the build tarball to avoid requiring python to build toybox.</p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
755 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
756 <li><p><b>newtoys.h</b> - List of NEWTOY() or OLDTOY() macros for all available |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
757 commands. Associates command_main() functions with command names, provides |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
758 option string for command line parsing (<a href="#lib_args">see lib/args.c</a>), |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
759 specifies where to install each command and whether toysh should fork before |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
760 calling it.</p></li> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
761 </ul> |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
762 |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
763 <p>Everything in this directory is a derivative file produced from something |
f6ffc6685a9e
Fluff out documentation and skeleton code.
Rob Landley <rob@landley.net>
parents:
256
diff
changeset
|
764 else. The entire directory is deleted by "make distclean".</p> |
200 | 765 <!--#include file="footer.html" --> |