[ 源代码： cppi ]
软件包：cppi（1.18-4）
adjusts or checks indentation of C and C++ preprocessor directives
GNU cppi adjusts or checks the indentation of C and C++ preprocessor directives in a file.
Indent the C preprocessor directives in FILE to reflect their nesting and ensure that there is exactly one space character between each #if, #elif, #define directive and the following token, and write the result to standard output. The number of spaces between the `#' and the following directive must correspond to the level of nesting of that directive.