MFC r298311,r298312:

r298311:

Make sure fmemopen succeeds in :test_append_binary_pos before calling ftell
on the FILE object

This fixes potential null pointer dereferences on failure

CID: 1254952

r298312:

Fix double fclose of `fp1` when freopen fails

freopen handles closing file descriptors on error, with the exception of
fdopen'ed descriptors, so closing an already fclose'd file descriptor is
incorrect

CID: 1338525

MFC r283801,r290846,r290851,r290856,r290860:

r283801 (by araujo):

Fix warning of implicit declaration of function 'mkdir'.

Differential Revision: D2662
Reviewed by: rodrigc, ngie

r290846:

Bump WARNS to 2

Sponsored by: EMC / Isilon Storage Division

r290851:

Change WARNS to 2 across the board with all the libc testcases

This effectively "reverts" r290846

Sponsored by: EMC / Isilon Storage Division

r290856 (by bapt):

also skip the definition of ':fopen_regular' to avoid the build to fail due to
unused variables defined by ATF macros

r290860 (by bapt):

Remove unused variables to fix building world

MFC r290537,r290540,r290560,r290856,r290871,r291839:

r290537:

Integrate tools/regression/lib/libc/stdio into the FreeBSD test suite
as lib/libc/tests/stdio

- Fix some whitespace
- Convert the testcases to ATF
- Convert "/dev/null" to _PATH_DEVNULL

Sponsored by: EMC / Isilon Storage Division

r290540:

printfloat_test and scanfloat_test need symbols from msun; these are automatically
provided on amd64, but not i386. Add libm to DPADD/LDADD to unbreak the i386
tinderbox

Pointyhat to: ngie
Sponsored by: EMC / Isilon Storage Division

r290560:

Convert print_positional_test over to ATF

Somehow missed in r290537

Sponsored by: EMC / Isilon Storage Division

r290856 (by bapt):

also skip the definition of ':fopen_regular' to avoid the build to fail due to
unused variables defined by ATF macros

r290871:

Disable -Wformat with scanfloat_test when compiling with gcc to avoid a
"use of assignment suppression and length modifier together in scanf format"
warning on line 90 (it's intentional)

Sponsored by: EMC / Isilon Storage Division

r291839:

Initialize errno to 0 in the nul testcase before testing it

For some odd reason stable/10 requires this, otherwise it always fails
the errno == 0 check on line 196.

Sponsored by: EMC / Isilon Storage Division

MFC r267004,r274592:

r267004 (by gahr):

- Use strlen instead of hardcoding a number
- Terminate a sentence with a period

Approved by: cognet

r274592 (by ngie):

Convert tools/regression/lib/libc/stdio/test-fmemopen into an ATF testcase and
rename as lib/libc/stdio/fmemopen2_test

Sponsored by: EMC / Isilon Storage Division

MFC r267004,r274592:

r267004 (by gahr):

- Use strlen instead of hardcoding a number
- Terminate a sentence with a period

Approved by: cognet

r274592 (by ngie):

Convert tools/regression/lib/libc/stdio/test-fmemopen into an ATF testcase and
rename as lib/libc/stdio/fmemopen2_test

Sponsored by: EMC / Isilon Storage Division