fmt_xlong - write a hexadecimal ASCII representation of an unsigned long integer

       fmt_xlong  writes  an  ASCII  representation  ('0'  to '9' and 'a' to 'f', base 16) of source to dest and
       returns the number of bytes written.

       fmt_xlong does not append \0.

       If dest equals FMT_LEN (i.e. is zero), fmt_xlong returns the number of bytes it would have written.

       For convenience, fmt.h defines the integer FMT_XLONG to be big enough to contain every possible fmt_xlong
       output plus \0.

       fmt_xlong - write a hexadecimal ASCII representation of an unsigned long integer

scan_xlong(3)

                                                                                                    fmt_xlong(3)

#include<libowfat/fmt.h>

       size_t fmt_xlong(char *dest,unsigned long source);