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strncpy
[counted copy string]

    SYNOPSIS
    #include <string.h>
    char *strncpy(char *dst, const char *src, size_t length);

DESCRIPTION
strncpy copies not more than length characters from the string pointed to by src (including the terminating null character) to the array pointed to by dst. If the string pointed to by src is shorter than length characters, null characters are appended to the destination array until a total of length characters have been written.

RETURNS
This function returns the initial value of dst.

COMPLIANCE
strncpy is ANSI C.

strncpy requires no supporting OS subroutines.