Convert GNU-C code to ANSI-C code
protoize command belongs to the gcc suite and is used to add function prototypes to C language source code files and convert GNU-C code to ANSI-C code.
protoize(option)(parameter)
-d: Set the directory where the code needs to be converted;
-x: Files to exclude when transcoding.
File: C language source file that needs to be converted into code.