system-programming/exercises/mycp

📄 mycp – A Simple File Copy Utility in C

mycp is a basic implementation of the Unix cp command written in C.
It copies the contents of one file into another, handling errors and signals safely.

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📦 Project Structure

mycp/
├── mycp.c           # Main program source
├── Makefile         # Build and test automation
└── test/
    └── run_tests.sh # Automated test and Valgrind report

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⚙️ Build Instructions

To compile the program:

make

To clean up build files:

make clean

To remove test artifacts as well:

make distclean

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🧪 Running Tests

The test script:

• Creates temporary test files
• Runs mycp and compares results with cmp
• Uses Valgrind to check for memory issues

Run the tests with:

make test

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🚀 Usage

./mycp SOURCE DEST

• SOURCE: Path to the file to copy from.
• DEST: Path to the file to copy to.

Example:

./mycp input.txt output.txt

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🧠 Learning Objectives

• Open/read/write/close file descriptors
• Use of open(2), read(2), write(2), and close(2)
• Error handling (perror, errno)
• Use of Makefile and basic testing with shell scripts
• Optional: use of lseek for advanced length computation

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✅ Requirements

• GCC (C11)
• POSIX-compliant system (Linux, macOS)
• Valgrind for memory leak analysis (optional, used in tests)

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📄 License

Educational use only. No license required.