SAS dataset label

[reikoch]

In addition to the name of a SAS dataset also its label is read in from sas7bdat and printed the dataset's metadata is listed.

[evanmiller]

I think additional pointer validation is necessary here. We need to ensure:

• The first memcmp does not overrun text_blob_lengths[0]
• off is not larger than ctx->col_info[0].name_ref.offset
• ctx->file_label is not overrun during the memcpy

Additionally: file_label likely needs to be recoded. So I suggest using readstat_convert here instead of the memcpy. That will automatically solve the third issue. Something like

readstat_convert(ctx->file_label, sizeof(ctx->file_label),
    &ctx->text_blobs[0][off], ctx->col_info[0].name_ref.offset - off, ctx->converter)

Then check the return value.

[reikoch]

Should be addressed with the last commit