Page Comparison

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Number of items read.

Notes/Warnings

1. The size or nitems is 0, then the file is unchanged and zero is returned.
2. If the file is buffered and the last operation is output (write), then a call to fs_flush() or fs_fsetpos() or fs_fseek()must occur before input (read) can be performed.
3. The file must have been opened in read or update (read/write) mode.