mirror of
https://gitlab.torproject.org/tpo/core/tor.git
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136 lines
4.6 KiB
Plaintext
136 lines
4.6 KiB
Plaintext
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0. The buildbot.
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http://tor-buildbot.freehaven.net:8010/
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1. Coding conventions
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1.0. Whitespace and C conformance
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Invoke "make check-spaces" from time to time, so it can tell you about
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deviations from our C whitespace style. Generally, we use:
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- Unix-style line endings
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- K&R-style indentation
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- No space before newlines
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- A blank line at the end of each file
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- Never more than one blank line in a row
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- Always spaces, never tabs
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- A space between control keywords and their corresponding paren
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"if (x)", "while (x)", and "switch (x)", never "if(x)", "while(x)", or
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"switch(x)".
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- A space between anything and an open brace.
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- No space between a function name and an opening paren. "puts(x)", not
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"puts (x)".
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- Function declarations at the start of the line.
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We try hard to build without warnings everywhere. In particular, if you're
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using gcc, you should invoke the configure script with the option
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"--enable-gcc-warnings". This will give a bunch of extra warning flags to
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the compiler, and help us find divergences from our preferred C style.
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1.1. Details
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Use tor_malloc, tor_free, tor_strdup, and tor_gettimeofday instead of their
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generic equivalents. (They always succeed or exit.)
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You can get a full list of the compatibility functions that Tor provides
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by looking through src/common/util.h and src/common/compat.h.
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Use 'INLINE' instead of 'inline', so that we work properly on Windows.
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1.2. Calling and naming conventions
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Whenever possible, functions should return -1 on error and 0 on success.
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For multi-word identifiers, use lowercase words combined with
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underscores. (e.g., "multi_word_identifier"). Use ALL_CAPS for macros and
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constants.
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Typenames should end with "_t".
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Function names should be prefixed with a module name or object name. (In
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general, code to manipulate an object should be a module with the same
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name as the object, so it's hard to tell which convention is used.)
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Functions that do things should have imperative-verb names
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(e.g. buffer_clear, buffer_resize); functions that return booleans should
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have predicate names (e.g. buffer_is_empty, buffer_needs_resizing).
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1.3. What To Optimize
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Don't optimize anything if it's not in the critical path. Right now,
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the critical path seems to be AES, logging, and the network itself.
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Feel free to do your own profiling to determine otherwise.
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1.4. Log conventions
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http://wiki.noreply.org/noreply/TheOnionRouter/TorFAQ#LogLevels
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No error or warning messages should be expected during normal OR or OP
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operation.
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If a library function is currently called such that failure always
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means ERR, then the library function should log WARN and let the caller
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log ERR.
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[XXX Proposed convention: every message of severity INFO or higher should
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either (A) be intelligible to end-users who don't know the Tor source; or
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(B) somehow inform the end-users that they aren't expected to understand
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the message (perhaps with a string like "internal error"). Option (A) is
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to be preferred to option (B). -NM]
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1.5. Doxygen
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We use the 'doxygen' utility to generate documentation from our
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source code. Here's how to use it:
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1. Begin every file that should be documented with
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/**
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* \file filename.c
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* \brief Short desccription of the file.
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**/
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(Doxygen will recognize any comment beginning with /** as special.)
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2. Before any function, structure, #define, or variable you want to
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document, add a comment of the form:
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/** Describe the function's actions in imperative sentences.
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*
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* Use blank lines for paragraph breaks
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* - and
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* - hyphens
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* - for
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* - lists.
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*
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* Write <b>argument_names</b> in boldface.
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*
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* \code
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* place_example_code();
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* between_code_and_endcode_commands();
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* \endcode
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*/
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3. Make sure to escape the characters "<", ">", "\", "%" and "#" as "\<",
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"\>", "\\", "\%", and "\#".
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4. To document structure members, you can use two forms:
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struct foo {
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/** You can put the comment before an element; */
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int a;
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int b; /**< Or use the less-than symbol to put the comment
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* after the element. */
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};
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5. To generate documentation from the Tor source code, type:
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$ doxygen -g
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To generate a file called 'Doxyfile'. Edit that file and run
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'doxygen' to generate the API documentation.
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6. See the Doxygen manual for more information; this summary just
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scratches the surface.
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