size_t strlcat_PF(char *dst, uint_farptr_t src, size_t siz)
The strlcat_PF() function is similar to strlcat(), except that the src string must be located in program space (flash) and is addressed using a far pointer
Appends src to string dst of size n (unlike strncat(), n is the full size of dst, not space left). At most n-1 characters will be copied. Always NULL terminates (unless n <= strlen(dst))
The strlcat_PF() function returns strlen(src) + MIN(n, strlen(initial dst)). If retval >= n, truncation occurred. The contents of RAMPZ SFR are undefined when the funcion returns