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nmtui: handle write() errors correctly in nmt_newt_edit_string

Jan Vaclav requested to merge jv/fix-newt-error-handling into main


Make it so that the function exits with an error message if the return value of write() indicates an unrecovarable write error.


It might happen that write() returns -1, but the errno is not EINTR. In that case, the length would be incremented by 1, and the data pointer to the data being written would be moved back by 1 byte on every error.


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Edited by Jan Vaclav

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