How to Mask C Source Code Safely

When this guide is useful

For those searching for "masking C language source code," "anonymizing function and variable names," and "securely sharing C code to AI," we will explain it, including preprocessors and strings.

• I want to share embedded C defect code externally.
• I want to hide product information from function names, structures, macros, constants, and strings.
• I want to ask questions to AI while keeping the control structure of the C code intact.

Information that tends to remain in C language code

• Function names, structure names, and enumerator names, including product and customer names
• String containing destination URL, IP address, and file path
• Unique values such as device ID, port number, threshold value, etc.
• Environment name mentioned in #define or conditional compilation

Masking procedure

1. Enter only the range you want to share and choose how many comments and values you want to leave.
2. Perform masking and see replacement results for functions, variables, types, strings, and numbers.
3. Check whether you can read the correspondence between preprocessors, pointers, arrays, and function calls.
4. Right-click on the result side and remove only the necessary parts, leaving only the information necessary for the explanation.

Final confirmation before sharing

Even if you replace the identifier, it may still be possible to infer the product or environment from comments, error messages, and fixed-length array values. Double-check the company name, domain, IP address, and part of the path using the search function.

Masking results do not guarantee compilability. If you want to share the code for reproduction, please also check the syntax and dependencies in another environment.

Specific example: Sharing C code for communication processing

Additional information: #define

By maintaining correspondence between function calls and arguments, and the same variable reference relationship, it is possible to retain the value of investigating pointer processing and error branching.

1. Extract only the functions, type definitions, and macros necessary for reproduction.
2. Check functions, variables, structures, macros, strings, numbers, and comments.
3. Check preprocessor lines, character/string literals, and pointer arithmetic after masking.
4. Re-search the real URL, IP, product name, and file path before sharing.

It is not possible to completely analyze the meaning after macro expansion and the build conditions. Before sharing, please check whether the necessary information remains from the compiler's perspective.

Frequently asked questions

Additional information for this feature.

It depends on what the tool is judging. Please check the results to see if the standard APIs required for investigation, such as printf and malloc, remain.

Should header files be processed as well?

Additional information for this feature.