Read a line from stream and save it to buffer, remove trailing blanks
The buffer to write to
Types: CharString, or similar
The RecordReader to read from.
This function stops on the beginning of the next line, if there is a next line
End-line characters and all trailing blanks are not written to buffer.
Works on ANSI EOL and on Unix EOL.
0 if there was no error reading
non-zero value on errors, especially EOF_BEFORE_SUCCESS
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