bug#21571: [patches] some small message improvements

[Andreas Schwab]

Pádraig Brady <address@hidden> writes:

> While this new wording doesn't overlaps with other descriptions,
> the original wording comes from POSIX.  I don't know that the distinction
> here is TBH. Perhaps onlret relates to input while onlcr relates to output?

<http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap11.html#tag_11_02_03>

 If ONLCR is set, the NL character shall be transmitted as the CR-NL
 character pair. If OCRNL is set, the CR character shall be transmitted
 as the NL character. If ONOCR is set, no CR character shall be
 transmitted when at column 0 (first position). If ONLRET is set, the NL
 character is assumed to do the carriage-return function; the column
 pointer shall be set to 0 and the delays specified for CR shall be
 used. Otherwise, the NL character is assumed to do just the line-feed
 function; the column pointer remains unchanged. The column pointer
 shall also be set to 0 if the CR character is actually transmitted.

So ONLRET is mostly about properly keeping track of the column.

Andreas.

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Andreas Schwab, address@hidden
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