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wchar_t *wcpcpy(wchar_t *dest, const wchar_t *src);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
The wcpcpy() function is the wide-character equivalent of the stpcpy(3)
function. It copies the wide-character string pointed to by src,
including the terminating null wide character (L'\0'), to the array
pointed to by dest.
The strings may not overlap.
The programmer must ensure that there is room for at least
wcslen(src)+1 wide characters at dest.
wcpcpy() returns a pointer to the end of the wide-character string
dest, that is, a pointer to the terminating null wide character.
Multithreading (see pthreads(7))
The wcpcpy() function is thread-safe.
GNU 2013-12-10 WCPCPY(3)