.TH substdio_out 3
.SH NAME
substdio_out \- substdio output routines
.SH SYNTAX
.B #include <substdio.h>

int \fBsubstdio_put\fP(&\fIs\fR,\fIfrom\fR,\fIlen\fR);
.br
int \fBsubstdio_puts\fP(&\fIs\fR,\fIfrom\fR);

int \fBsubstdio_bput\fP(&\fIs\fR,\fIfrom\fR,\fIlen\fR);
.br
int \fBsubstdio_bputs\fP(&\fIs\fR,\fIfrom\fR);

int \fBsubstdio_flush\fP(&\fIs\fR);

int \fBsubstdio_putflush\fP(&\fIs\fR,\fIfrom\fR,\fIlen\fR);
.br
int \fBsubstdio_putsflush\fP(&\fIs\fR,\fIfrom\fR);

substdio \fIs\fR;
.br
char *\fIfrom\fR;
.br
int \fIlen\fR;
.SH DESCRIPTION
.B substdio_put
writes
.I len
characters to
.I s
out of the character array
.IR from .
It returns 0 on success, -1 on error.

.B substdio_bput
has the same function as
.BR substdio_put .
The difference is how the buffer is flushed
when there isn't enough room for
.I len
characters:
.B substdio_put
flushes the buffered data before copying the new data,
whereas
.B substdio_bput
fills the buffer with new data before flushing.

.B substdio_flush
forces all data to be written from the internal buffer.
It returns 0 on success, -1 on error.

.B substdio_putflush
is similar to
.B substdio_put
followed by
.BR substdio_flush ,
but it avoids all internal copies.

.BR substdio_puts ,
.BR substdio_bputs ,
and
.B substdio_putsflush
are the same as
.BR substdio_put ,
.BR substdio_bput ,
and
.B substdio_putflush
except that
.I from
must be a 0-terminated string of characters.
The string, not including the 0, is written.

The
.B SUBSTDIO_OUTSIZE
macro is defined as a reasonably large output buffer size for
.BR substdio_fdbuf .
.SH "INTERNALS"
When a
.B substdio
variable
.I s
is used for output,
data is buffered from
.I s\fB.x
to
.I s\fB.x\fR +
.I s\fB.p\fR;
there is free buffer space from
to
.I s\fB.x\fR +
.I s\fB.p
to
.I s\fB.x\fR +
.I s\fB.n\fR;
the total buffer length is
.I s\fB.n\fR.
.SH "SEE ALSO"
substdio(3)