Terminate strncpy() buffers correctly
When using strncpy() with a buffer we need to account for the terminating NUL character. GCC 8 started warning when using PPD_MAX_NAME as the buffer length for strncpy() because the buffer we're copying into has the same length — which means that the terminating NUL may be skipped if the source string has a length of PPD_MAX_NAME. The appropriate way to handle the case where we're copying a source with a length bigger than of PPD_MAX_NAME is, as reported in the strncpy() documentation, to copy `PPD_MAX_NAME - 1` bytes, and explicitly NUL terminate the destination buffer. This has the additional benefit of avoiding the compiler warning.
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