What is the C equivalent of std::byte (that can handle IO operations correctly)?

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In C, there is no direct equivalent for std::byte. However, a possible alternative could be to use unsigned char for representing bytes, as it has the same size and properties. For handling IO operations on bytes, one way is to use functions that work with data buffers, such as fread(), fwrite() and memcpy(). For example, to read a byte from a binary file, one can use:

unsigned char byte;
FILE* file = fopen("filename.bin", "rb");
fread(&byte, 1, 1, file);
fclose(file);

This code reads a single byte from the file "filename.bin" and stores it in the variable byte. The "rb" mode opens the file in binary mode, which is necessary for handling binary data. Similar operations can be performed for writing bytes using fwrite(), or copying bytes between memory locations using memcpy().