Fix some -Wstring-op-truncation warnings

[Michael Catanzaro]

testAtomicStringNumber may not be null-terminated. Caught by -Wstringop-truncation:

../../Tools/TestWebKitAPI/Tests/WTF/AtomicString.cpp:67:17: warning: ‘char* strncpy(char*, const char*, size_t)’ specified bound 100 equals destination size [-Wstringop-truncation]

[Michael Catanzaro]

Also, related:

[415/2047] Building CXX object Tools/TestWebKitAPI/CMakeFiles/TestWTF.dir/Tests/WTF/WTFString.cpp.o
../../Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp: In function ‘const char* TestWebKitAPI::testStringNumber(double)’:
../../Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp:169:17: warning: ‘char* strncpy(char*, const char*, size_t)’ specified bound 100 equals destination size [-Wstringop-truncation]
     std::strncpy(testBuffer, String::numberToStringECMAScript(number).utf8().data(), 100);
     ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp:169:17: warning: ‘char* strncpy(char*, const char*, size_t)’ specified bound 100 equals destination size [-Wstringop-truncation]
../../Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp: In function ‘const char* TestWebKitAPI::testStringNumberFixedWidth(double)’:
../../Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp:120:17: warning: ‘char* strncpy(char*, const char*, size_t)’ specified bound 100 equals destination size [-Wstringop-truncation]
     std::strncpy(testBuffer, String::numberToStringFixedWidth(number, 6).utf8().data(), 100);
     ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp:120:17: warning: ‘char* strncpy(char*, const char*, size_t)’ specified bound 100 equals destination size [-Wstringop-truncation]
../../Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp: In function ‘const char* TestWebKitAPI::testStringNumberFixedPrecision(double)’:
../../Tools/TestWebKitAPI/Tests/WTF/WTFString.cpp:71:17: warning: ‘char* strncpy(char*, const char*, size_t)’ specified bound 100 equals destination size [-Wstringop-truncation]
     std::strncpy(testBuffer, String::number(number).utf8().data(), 100);
     ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[Michael Catanzaro]

Created attachment 340064 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 340064 [details]
Patch

Clearing flags on attachment: 340064

Committed r231661: <https://trac.webkit.org/changeset/231661>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/40142604>

[Darin Adler]

Thanks for fixing this. For the record, changing the 100 to 99 was necessary, but adding the "= { }" was not since these are globals and initialized to zero in any case.

[Michael Catanzaro]

(In reply to Darin Adler from comment #6)
> Thanks for fixing this. For the record, changing the 100 to 99 was
> necessary, but adding the "= { }" was not since these are globals and
> initialized to zero in any case.

Good point, you're right! I overlooked the static keyword.