https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71431
Bug ID: 71431
Summary: ifstream::rdbuf directory
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: dimaqq at gmail dot com
Target Milestone: ---
Pardon my primitive code:
```
auto utf8 = std::locale(std::locale(), new std::codecvt_utf8<wchar_t>);
std::wifstream expression(argv[1]);
if (!expression) { /* ... */ return 99; }
expression.imbue(utf8);
std::wstringstream buf;
buf << expression.rdbuf();
```
This works fine for files; fails correctly for files that won't open (doesn't
exist, wrong permissions, etc).
It doesn't fail for directories though (result is same as empty file).
None of the error bits are set either.
strace shows a failed read call:
```
open(".", O_RDONLY) = 4
read(4, 0x10b0250, 8191) = -1 EISDIR (Is a directory)
```
But no error is reported. That can't be right, can it?
gcc version 6.1.1 20160501 (GCC); x86_64-pc-linux-gnu
