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.TH fmt_xlong 3
fmt_xlong \- write a hexadecimal ASCII representation of an unsigned long integer
.B #include <libowfat/fmt.h>
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size_t \fBfmt_xlong\fP(char *\fIdest\fR,unsigned long \fIsource\fR);
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fmt_xlong writes an ASCII representation ('0' to '9' and 'a' to 'f',
base 16) of \fIsource\fR to \fIdest\fR and returns the number of bytes
fmt_xlong does not append \\0.
If \fIdest\fR 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.