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manual: Document that feof and ferror are mutually exclusive

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This is not completely clear from the C standard (although there
is footnote number 289 in C11), but I assume that our implementation
works this way.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Florian Weimer 2024-09-27 11:41:12 +02:00
parent 1d72fa3cfa
commit f47596fcfe
1 changed files with 9 additions and 0 deletions
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manual/stdio.texi
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@ -4168,6 +4168,15 @@ check indicators that are part of the internal state of the stream
object, indicators set if the appropriate condition was detected by a
previous I/O operation on that stream.
The end of file and error conditions are mutually exclusive. For a
narrow oriented stream, end of file is not considered an error. For
wide oriented streams, reaching the end of the underlying file can
result an error if the underlying file ends with an incomplete multibyte
sequence. This is reported as an error by @code{ferror}, and not as an
end of file by @code{feof}. End of file on wide oriented streams that
does not fall into the middle of a multibyte sequence is reported via
@code{feof}.
@deftypevr Macro int EOF
@standards{ISO, stdio.h}
This macro is an integer value that is returned by a number of narrow