(emacs.info) C Indent

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 Commands for C Indentation
 --------------------------
 
    Here are the commands for indentation in C mode and related modes:
 
 `C-c C-q'
      Reindent the current top-level function definition or aggregate
      type declaration (`c-indent-defun').
 
 `C-M-q'
      Reindent each line in the balanced expression that follows point
      (`c-indent-exp').  A prefix argument inhibits error checking and
      warning messages about invalid syntax.
 
 `<TAB>'
      Reindent the current line, and/or in some cases insert a tab
      character (`c-indent-command').
 
      If `c-tab-always-indent' is `t', this command always reindents the
      current line and does nothing else.  This is the default.
 
      If that variable is `nil', this command reindents the current line
      only if point is at the left margin or in the line's indentation;
      otherwise, it inserts a tab (or the equivalent number of spaces,
      if `indent-tabs-mode' is `nil').
 
      Any other value (not `nil' or `t') means always reindent the line,
      and also insert a tab if within a comment, a string, or a
      preprocessor directive.
 
 `C-u <TAB>'
      Reindent the current line according to its syntax; also rigidly
      reindent any other lines of the expression that starts on the
      current line.   Multi-line Indent.
 
    To reindent the whole current buffer, type `C-x h C-M-\'.  This
 first selects the whole buffer as the region, then reindents that
 region.
 
    To reindent the current block, use `C-M-u C-M-q'.  This moves to the
 front of the block and then reindents it all.
 

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