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.TH fmt_longlong 3
fmt_longlong \- write an ASCII representation of a long long integer
.B #include <fmt.h>
size_t \fBfmt_longlong\fP(char *\fIdest\fR,long long \fIsource\fR);
fmt_longlong writes an ASCII representation ('-' and '0' to '9', base 10) of
\fIsource\fR to \fIdest\fR and returns the number of bytes written.
fmt_longlong does not append \\0.
If \fIdest\fR 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.