*Might* an unsigned char be equal to EOF? [duplicate]

Answer 1

I think you need to rely on stream error.

ch = fgetc(stream);
if (ferror(stream) && (ch == EOF)) /* end of file */;

From the standard

If a read error occurs, the error indicator for the stream is set and the fgetc function returns EOF.

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Edit for better version

ch = fgetc(stream);
if (ch == EOF) {
    if (ferror(stream)) /* error reading */;
    else if (feof(stream)) /* end of file */;
    else /* read valid character with value equal to EOF */;
}