Section: 31.7.5.4 [istream.unformatted] Status: CD1 Submitter: Martin Sebor Opened: 2006-02-23 Last modified: 2016-01-28 10:19:27 UTC
Priority: Not Prioritized
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Discussion:
The array forms of unformatted input functions don't have well-defined semantics for zero-element arrays in a couple of cases. The affected ones (istream::get() and getline()) are supposed to terminate when (n - 1) characters are stored, which obviously can never be true when (n == 0) to start with.
Proposed resolution:
I propose the following changes (references are relative to the Working Draft (document N1804).
Change 27.6.1.3, p8 (istream::get()), bullet 1 as follows:
if (n < 1) is true or (n - 1) characters are stored;
Similarly, change 27.6.1.3, p18 (istream::getline()), bullet 3 as follows:
(n < 1) is true or (n - 1) characters are stored (in which case the function calls setstate(failbit)).
Finally, change p21 as follows:
In any case, provided (n > 0) is true, it then stores a null character (using charT()) into the next successive location of the array.