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update assert message format in Assert_Throw #257

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update assert message format in Assert_Throw #257

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11 changes: 10 additions & 1 deletion src/Util/util.cpp
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AI Review for src/Util/util.cpp:

Code Review: Patch to src/Util/util.cpp

Summary

This patch modifies the Assert_Throw function to improve the format of assertion failure messages. It conditionally shortens the file path displayed in the message if the ZLMediaKit_PREFIX_LENGTH macro is defined. This is a patch review.

Detailed Feedback

Code Overview

The patch modifies the error message generated by Assert_Throw to include the file path relative to a project root directory if ZLMediaKit_PREFIX_LENGTH is defined. This improves the readability and helpfulness of error messages, especially in large projects.

Strengths

  • Improved Error Messages: The change significantly improves the clarity and usefulness of assertion failure messages. The inclusion of the file path and line number makes debugging much easier.
  • Conditional Logic: The use of #ifdef ZLMediaKit_PREFIX_LENGTH makes the code adaptable to different build configurations. This is a good practice for maintaining flexibility.
  • Clear Formatting: The new message format is well-structured and easy to read.

Areas for Improvement

1. Potential Off-by-One Error and String Handling

  • Issue: The line int offset = strlen(file) > ZLMediaKit_PREFIX_LENGTH + 1 ? ZLMediaKit_PREFIX_LENGTH + 1: 0; might lead to an off-by-one error. If strlen(file) is equal to ZLMediaKit_PREFIX_LENGTH + 1, offset will be ZLMediaKit_PREFIX_LENGTH + 1, causing the output to potentially skip the first character after the prefix. Additionally, there's no error handling for potential null pointers in file.

  • Suggestion: Use std::string for safer string manipulation and adjust the offset calculation to avoid the potential off-by-one error. Add a check for a null or empty file pointer.

  • Example:

#if defined(ZLMediaKit_PREFIX_LENGTH)
    std::string filePath(file);
    if (!filePath.empty()) {
        size_t offset = std::min(filePath.size(), (size_t)ZLMediaKit_PREFIX_LENGTH + 1);
        printer << "), at " << filePath.substr(offset) << "#" << line << "@" << func;
    } else {
        printer << "), at <unknown file>#" << line << "@" << func;
    }
#else
    printer << "), at " << file << "#" << line << "@" << func;
#endif

2. Clarity of ZLMediaKit_PREFIX_LENGTH

  • Issue: The meaning and usage of ZLMediaKit_PREFIX_LENGTH are not explicitly explained in the code.

  • Suggestion: Add a comment explaining the purpose of this macro and how it's used to determine the project root directory. Consider adding a more descriptive name, such as ZLMediaKit_PROJECT_ROOT_LENGTH.

  • Example:

// ZLMediaKit_PROJECT_ROOT_LENGTH: The length of the project root directory path.
// This macro is used to shorten the file path displayed in assertion error messages.
// It should be defined to the length of the common prefix of all source files.
#if defined(ZLMediaKit_PROJECT_ROOT_LENGTH)
    // ... (rest of the improved code from suggestion 1)
#else
    // ...
#endif

3. Error Handling for strlen

  • Issue: The code assumes file is always a valid C-style string. If file is a null pointer, strlen(file) will cause a crash.

  • Suggestion: Add a check to handle the case where file is null or empty.

  • Example: (Already partially addressed in suggestion 1)

Conclusion

This patch is a valuable improvement to the project. The enhanced error messages will significantly aid in debugging. Addressing the suggested improvements regarding potential off-by-one errors, string handling, and clarifying the macro's purpose will further enhance the code's robustness and maintainability.

TRANS_BY_GITHUB_AI_ASSISTANT

Original file line number Diff line number Diff line change
Expand Up @@ -669,7 +669,16 @@ void Assert_Throw(int failed, const char *exp, const char *func, const char *fil
if(str && *str){
printer << ", " << str;
}
printer << "), function " << func << ", file " << file << ", line " << line << ".";
#if defined(ZLMediaKit_PARENT_DIR_LENGTH) && defined(ZLMediaKit_PARENT_DIR)
// Assertion failed: (false), at ZLMediaKit/ext-codec/H264Rtmp.cpp#42@foobar
int offset = strncmp(file, ZLMediaKit_PARENT_DIR, ZLMediaKit_PARENT_DIR_LENGTH) == 0
? ZLMediaKit_PARENT_DIR_LENGTH + 1
: 0;
printer << "), at " << (file + offset) << "#" << line << "@" << func;
#else
printer << "), at " << file << "#" << line << "@" << func;
#endif

throw toolkit::AssertFailedException(printer);
}
}
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