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60 lines
2.0 KiB
Plaintext
60 lines
2.0 KiB
Plaintext
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Coding Style Conventions
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========================
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Coding style guidelines are about reducing the number of unnecessary
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reformatting patches and making things easier for developers to work together.
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You don't have to like them or even agree with them, but once put in place we
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all have to abide by them (or vote to change them). However, coding style
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should never outweigh coding itself and so the guidelines described here are
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hopefully easy enough to follow as they are very common and supported by tools
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and editors.
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The basic style for C code is the Linux kernel coding style [1] with one
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excecption, we use 4 spaces instead of tabs. This closely matches what most
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libssh developers use already anyways, with a few exceptions as mentioned
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below.
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To shorthen this here are the highlights:
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* Maximum line width is 80 characters
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The reason is not about people with low-res screens but rather sticking
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to 80 columns prevents you from easily nesting more than one level of
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if statements or other code blocks.
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* Use 4 spaces to indent
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* No trailing whitespaces
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* Follow the K&R guidelines. We won't go through all of them here. Do you
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have a copy of "The C Programming Language" anyways right?
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Editors
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========
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VIM
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----
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set ts=4 sw=4 et cindent
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For Vim, the following settings in $HOME/.vimrc will also deal with
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displaying trailing whitespace:
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if has("syntax") && (&t_Co > 2 || has("gui_running"))
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syntax on
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function! ActivateInvisibleCharIndicator()
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syntax match TrailingSpace "[ \t]\+$" display containedin=ALL
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highlight TrailingSpace ctermbg=Red
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endf
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autocmd BufNewFile,BufRead * call ActivateInvisibleCharIndicator()
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endif
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" Show tabs, trailing whitespace, and continued lines visually
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set list listchars=tab:»·,trail:·,extends:…
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" highlight overly long lines same as TODOs.
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set textwidth=80
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autocmd BufNewFile,BufRead *.c,*.h exec 'match Todo /\%>' . &textwidth . 'v.\+/'
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[1] https://www.kernel.org/doc/Documentation/CodingStyle
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