fmt_longlong - write an ASCII representation of a long long integer

       fmt_longlong  writes  an ASCII representation ('-' and '0' to '9', base 10) of source to dest and returns
       the number of bytes written.

       fmt_longlong does not append \0.

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

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

       fmt_longlong - write an ASCII representation of a long long integer

scan_longlong(3)

                                                                                                 fmt_longlong(3)

#include<libowfat/fmt.h>

       size_t fmt_longlong(char *dest,long long source);