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    Length: 4202 (0x106a)
    Types: TextFile
    Names: »fdx2ps.c«

└─⟦3d0c2be1b⟧ Bits:30001254 ISODE-5.0 Tape
    └─⟦eba4602b1⟧ »./isode-5.0.tar.Z« 
        └─⟦d3ac74d73⟧ 
            └─⟦this⟧ »isode-5.0/psap/fdx2ps.c« 

TextFile

/* fdx2ps.c - full-duplex abstraction for PStreams */

#ifndef	lint
static char *rcsid = "$Header: /f/osi/psap/RCS/fdx2ps.c,v 6.0 89/03/18 23:38:14 mrose Rel $";
#endif

/* 
 * $Header: /f/osi/psap/RCS/fdx2ps.c,v 6.0 89/03/18 23:38:14 mrose Rel $
 *
 *
 * $Log:	fdx2ps.c,v $
 * Revision 6.0  89/03/18  23:38:14  mrose
 * Release 5.0
 * 
 */

/*
 *				  NOTICE
 *
 *    Acquisition, use, and distribution of this module and related
 *    materials are subject to the restrictions of a license agreement.
 *    Consult the Preface in the User's Manual for the full terms of
 *    this agreement.
 *
 */


/* LINTLIBRARY */

#include <stdio.h>
#include "psap.h"

/* \f

   DATA */

struct ps_fdx {
    int	    ps_fd;

    struct ps_inout {
	char   *pio_base;
	int	pio_bufsiz;

	char   *pio_ptr;
	int	pio_cnt;
    }	    ps_input,
	    ps_output;
};

/* \f

 */

/* ARGSUSED */
    
static int  fdx_read (ps, data, n, in_line)
register PS	ps;
PElementData data;
PElementLen n;
int	in_line;
{
    int	    cc;
    register struct ps_fdx *pt = (struct ps_fdx *) ps -> ps_addr;
    register struct ps_inout *pi = &pt -> ps_input;

    if ((cc = pi -> pio_cnt) <= 0) {
	if (n > pi -> pio_bufsiz) {
	    if ((cc = read (pt -> ps_fd, (char *) data, n)) == NOTOK)
		return ps_seterr (ps, PS_ERR_IO, NOTOK);

	    return cc;
	}

	if ((cc = read (pt -> ps_fd, pi -> pio_base, pi -> pio_bufsiz))
		== NOTOK)
	    return ps_seterr (ps, PS_ERR_IO, NOTOK);
	pi -> pio_ptr = pi -> pio_base, pi -> pio_cnt = cc;
    }

    if (cc > n)
	cc = n;

    bcopy (pi -> pio_ptr, (char *) data, cc);
    pi -> pio_ptr += cc, pi -> pio_cnt -= cc;

    return cc;
}


/* ARGSUSED */

static int  fdx_write (ps, data, n, in_line)
register PS	ps;
PElementData data;
PElementLen n;
int	in_line;
{
    int	    cc;
    register struct ps_fdx *pt = (struct ps_fdx *) ps -> ps_addr;
    register struct ps_inout *po = &pt -> ps_output;

#ifdef	oldef
    if (n > po -> pio_bufsiz) {
	if (fdx_flush (ps) == NOTOK
		|| (cc = write (pt -> ps_fd, (char *) data, n)) != n)
#else
    if (n > po -> pio_bufsiz && po -> pio_ptr <= po -> pio_base) {
	if ((cc = write (pt -> ps_fd, (char *) data, n)) != n)
#endif
	    return ps_seterr (ps, PS_ERR_IO, NOTOK);

	return cc;
    }

    if (n > po -> pio_cnt)
	n = po -> pio_cnt;

    bcopy ((char *) data, po -> pio_ptr, n);
    po -> pio_ptr += n, po -> pio_cnt -= n;

    if (po -> pio_cnt <= 0 && fdx_flush (ps) == NOTOK)
	return ps_seterr (ps, PS_ERR_IO, NOTOK);

    return n;
}


static int  fdx_flush (ps)
register PS	ps;
{
    int	    cc;
    register struct ps_fdx *pt = (struct ps_fdx *) ps -> ps_addr;
    register struct ps_inout *po = &pt -> ps_output;

    if ((cc = po -> pio_ptr - po -> pio_base) <= 0)
	return OK;

    if (write (pt -> ps_fd, po -> pio_base, cc) != cc)
	return ps_seterr (ps, PS_ERR_IO, NOTOK);
    po -> pio_ptr = po -> pio_base, po -> pio_cnt = po -> pio_bufsiz;

    return OK;
}


static int  fdx_close (ps)
register PS	ps;
{
    register struct ps_fdx *pt = (struct ps_fdx *) ps -> ps_addr;

    if (pt == NULL)
	return OK;

    if (pt -> ps_input.pio_base)
	free (pt -> ps_input.pio_base);
    if (pt -> ps_output.pio_base)
	free (pt -> ps_output.pio_base);

    free ((char *) pt);

    return OK;
}

/* \f

 */

int	fdx_open (ps)
register PS	ps;
{
    ps -> ps_readP = fdx_read;
    ps -> ps_writeP = fdx_write;
    ps -> ps_flushP = fdx_flush;
    ps -> ps_closeP = fdx_close;

    return OK;
}


int	fdx_setup (ps, fd)
register PS	ps;
int	fd;
{
    int	    pz;
    register struct ps_fdx *pt;

    if ((pt = (struct ps_fdx *) calloc (1, sizeof *pt)) == NULL)
	return ps_seterr (ps, PS_ERR_NMEM, NOTOK);
    ps -> ps_addr = (caddr_t) pt;

    pt -> ps_fd = fd;

#ifdef	BSD42
    if ((pz = getpagesize ()) <= 0)
#endif
	pz = BUFSIZ;

    if ((pt -> ps_input.pio_base = malloc ((unsigned) pz)) == NULL
	    || (pt -> ps_output.pio_base = malloc ((unsigned) pz)) == NULL)
	return ps_seterr (ps, PS_ERR_NMEM, NOTOK);
    pt -> ps_input.pio_bufsiz = pz, pt -> ps_output.pio_cnt = 0;
    pt -> ps_input.pio_ptr = pt -> ps_input.pio_base;

    pt -> ps_output.pio_bufsiz = pt -> ps_output.pio_cnt = pz;
    pt -> ps_output.pio_ptr = pt -> ps_output.pio_base;

    return OK;
}