stpcpy - copy a string returning a pointer to its end
The stpcpy() function copies the string pointed to by
src (including the terminating null byte ('\0')) to the array pointed to by
dest. The strings may not overlap, and the destination string
dest must be large enough to receive the copy.
stpcpy() returns a pointer to the end of the string
dest (that is, the address of the terminating null byte) rather than the beginning.
This function was added to POSIX.1-2008. Before that, it was not part of the C or POSIX.1 standards, nor customary on UNIX systems. It first appeared at least as early as 1986, in the Lattice C AmigaDOS compiler, then in the GNU fileutils and GNU textutils in 1989, and in the GNU C library by 1992. It is also present on the BSDs.
This function may overrun the buffer
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