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char *stpncpy(char *dest, const char *src, size_t n);
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 stpncpy() function copies at most n characters from the string
pointed to by src, including the terminating null byte ('\0'), to the
array pointed to by dest. Exactly n characters are written at dest.
If the length strlen(src) is smaller than n, the remaining characters
in the array pointed to by dest are filled with null bytes ('\0'), If
the length strlen(src) is greater than or equal to n, the string
pointed to by dest will not be null-terminated.
The strings may not overlap.
The programmer must ensure that there is room for at least n characters
stpncpy() returns a pointer to the terminating null byte in dest, or,
if dest is not null-terminated, dest+n.
Multithreading (see pthreads(7))
The stpncpy() function is thread-safe.
This function was added to POSIX.1-2008. Before that, it was a GNU
GNU 2014-01-13 STPNCPY(3)