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/* dg2ps.c - datagram-backed abstraction for PStreams */
/*
* isode/psap/dg2ps.c
*/
/*
* 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"
struct ps_dg {
int ps_fd;
int ps_maxsize;
struct ps_inout {
struct qbuf *pio_qb;
char *pio_ptr;
int pio_cnt;
IFP pio_fnx;
} ps_input,
ps_output;
IFP ps_check;
};
extern IFP set_check_fd ();
/* */
static int dg_prime (ps, waiting)
register PS ps;
int waiting;
{
struct qbuf *qb;
register struct ps_dg *pt = (struct ps_dg *) ps -> ps_addr;
register struct ps_inout *pi = &pt -> ps_input;
switch (waiting) {
case 0:
if (pi -> pio_cnt > 0)
return OK;
break;
case 1:
default:
return (pi -> pio_cnt > 0 ? DONE : OK);
case -1:
if (pi -> pio_cnt <= 0)
return OK;
break;
}
if (pi -> pio_qb != NULL) {
qb_free (pi -> pio_qb);
pi -> pio_qb = NULL;
}
pi -> pio_cnt = 0;
if (waiting < 0)
return ps_seterr (ps, PS_ERR_EXTRA, NOTOK);
if ((*pi -> pio_fnx) (pt -> ps_fd, &qb) == NOTOK)
return ps_seterr (ps, PS_ERR_IO, NOTOK);
if (pi -> pio_qb = qb)
pi -> pio_ptr = qb -> qb_data, pi -> pio_cnt = qb -> qb_len;
else
pi -> pio_ptr = NULL, pi -> pio_cnt = 0;
return OK;
}
/* ARGSUSED */
static int dg_read (ps, data, n, in_line)
register PS ps;
PElementData data;
PElementLen n;
int in_line;
{
int cc;
register struct ps_dg *pt = (struct ps_dg *) ps -> ps_addr;
register struct ps_inout *pi = &pt -> ps_input;
if ((cc = pi -> pio_cnt) <= 0)
return 0;
if (cc > n)
cc = n;
memcpy ((char *) data, pi -> pio_ptr, cc);
pi -> pio_ptr += cc, pi -> pio_cnt -= cc;
return cc;
}
/* ARGSUSED */
static int dg_write (ps, data, n, in_line)
register PS ps;
PElementData data;
PElementLen n;
int in_line;
{
register struct ps_dg *pt = (struct ps_dg *) ps -> ps_addr;
register struct ps_inout *po = &pt -> ps_output;
if (po -> pio_cnt < n)
return 0;
memcpy (po -> pio_ptr, (char *) data, n);
po -> pio_ptr += n, po -> pio_cnt -= n;
return n;
}
static int dg_flush (ps)
register PS ps;
{
register struct ps_dg *pt = (struct ps_dg *) ps -> ps_addr;
register struct ps_inout *po = &pt -> ps_output;
register struct qbuf *qb = po -> pio_qb;
qb -> qb_len = po -> pio_ptr - qb -> qb_data;
if ((*po -> pio_fnx) (pt -> ps_fd, qb) != qb -> qb_len)
return ps_seterr (ps, PS_ERR_IO, NOTOK);
po -> pio_ptr = qb -> qb_data, po -> pio_cnt = pt -> ps_maxsize;
return OK;
}
static int dg_close (ps)
register PS ps;
{
register struct ps_dg *pt = (struct ps_dg *) ps -> ps_addr;
if (pt == NULL)
return OK;
if (pt -> ps_input.pio_qb)
qb_free (pt -> ps_input.pio_qb);
if (pt -> ps_output.pio_qb)
qb_free (pt -> ps_output.pio_qb);
(void) set_check_fd (pt -> ps_fd, NULLIFP, NULLCP);
free ((char *) pt);
return OK;
}
static int dg_check (fd, data)
int fd;
caddr_t data;
{
int n;
PS ps = (PS) data;
register struct ps_dg *pt = (struct ps_dg *) ps -> ps_addr;
if (pt -> ps_check && (n = (*pt -> ps_check) (fd)))
return n;
return (ps_prime (ps, 1) > 0 ? DONE : OK);
}
/* */
int dg_open (ps)
register PS ps;
{
ps -> ps_primeP = dg_prime;
ps -> ps_readP = dg_read;
ps -> ps_writeP = dg_write;
ps -> ps_flushP = dg_flush;
ps -> ps_closeP = dg_close;
return OK;
}
int dg_setup (ps, fd, size, rfx, wfx, cfx)
register PS ps;
int fd,
size;
IFP rfx,
wfx,
cfx;
{
register struct ps_dg *pt;
register struct ps_inout *po;
register struct qbuf *qb;
if ((pt = (struct ps_dg *) calloc (1, sizeof *pt)) == NULL)
return ps_seterr (ps, PS_ERR_NMEM, NOTOK);
ps -> ps_addr = (caddr_t) pt;
pt -> ps_fd = fd;
pt -> ps_maxsize = size;
if ((qb = (struct qbuf *) malloc (sizeof *qb
+ (unsigned) pt -> ps_maxsize))
== NULL)
return ps_seterr (ps, PS_ERR_NMEM, NOTOK);
qb -> qb_forw = qb -> qb_back = qb;
qb -> qb_len = 0;
qb -> qb_data = qb -> qb_base;
po = &pt -> ps_output;
po -> pio_qb = qb;
po -> pio_ptr = qb -> qb_data, po -> pio_cnt = pt -> ps_maxsize;
if ((pt -> ps_input.pio_fnx = rfx) == NULLIFP
|| (po -> pio_fnx = wfx) == NULLIFP)
return ps_seterr (ps, PS_ERR_XXX, NOTOK);
pt -> ps_check = cfx;
(void) set_check_fd (fd, dg_check, (caddr_t) ps);
return OK;
}
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