Category : UNIX Files
Archive   : RZSZ.ZIP
Filename : VVMODEM.C

 
Output of file : VVMODEM.C contained in archive : RZSZ.ZIP
/*
* VMODEM
* VMS support for UMODEM and vvrb/vvsb programs
*
* Defined herein are some utility routines to make the UNIX
* program UMODEM run under VAX/VMS C:
*
* assign_channel Calls the VMS System Service $ASSIGN
* to assign a channel to a device.
* The routine currently has the device
* "TT" hardwired into it.
* gtty Gets terminal characteristics, almost
* like the UNIX GTTY system call.
* raw_read Reads characters from the terminal
* without any echoing or interpretation
* and with an optional timeout period.
* raw_write Writes a character to the terminal
* without any interpretation.
* raw_wbuf Writes a buffer to the terminal
* without any interpretation.
* stty Sets terminal characteristics, almost
* like the UNIX STTY system call.
*
* Some of the ideas used here were obtained from code written
* by Max Benson and Robert Bruccoleri.
*
* Walter Reiher
* Harvard University
* Department of Chemistry
* 12 Oxford Street
* Cambridge, MA 02138
* March 11, 1983
*
* Modified 4-20-88 Chuck Forsberg, Omen Technology INC
* 17505-V NW Sauvie IS RD Portland OR 97231 omen!caf
* Added primitives for for ZMODEM use.
*/
#include descrip
#include iodef
#include rms
#include ssdef
#include stdio
#include "vmodem.h"

#define TRUE 1
#define FALSE 0

static char tt_name[] = "TT";
static short tt_chan = -1; /* Terminal channel number */

struct tt_io_iosb /* Terminal I/O IOSB */
{
short status;
short byte_count;
short terminator;
short terminator_size;
};


struct tt_io_tacf /* Terminal I/O type ahead */
{
short byte_count;
char firstchar;
char something;
short whatever;
};

/*
* Terminator mask for PASSALL reads.
* Permits reads of all possible 8-bit characters.
*/
int t_mask[32] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0 };

struct terminator_mask {
short size ;
short unused ;
int *mask ;
}

termin_mask = { 32, 0, t_mask };

/*
* ASSIGN a channel to the logical name TT, which is usually
* the terminal.
*/
assign_channel()
{
int status;
$DESCRIPTOR(tt_descriptor, tt_name);

if (tt_chan == -1)
status = sys$assign(&tt_descriptor, &tt_chan, 0, 0);
else
status = SS$_NORMAL;

if (status != SS$_NORMAL || tt_chan == -1)
fatal("ASSIGN_CHANNEL: error in SYS$ASSIGN\n");

return;
}

/*
* Gets terminal information from VMS.
*/
gtty(tt_characteristics)
struct tt_info *tt_characteristics;
{
int c;
int status;
extern unsigned Baudrate;
int speeds[] = { 2400, 50, 75, 110, 134, 150, 300, 600, 1200, 1800,
2000, 2400, 3600, 4800, 7200, 9600, 19200 };

if (tt_chan == -1)
assign_channel();

status = sys$qiow(0, tt_chan, IO$_SENSEMODE,
&(tt_characteristics->dev_modes), NULL, 0,
&(tt_characteristics->dev_characteristics), 12,
0, 0, 0, 0);
if (status != SS$_NORMAL ||
tt_characteristics->dev_modes.status != SS$_NORMAL)
fatal("GTTY: sense mode QIO error return.\n");

c = tt_characteristics->dev_modes.t_speed % 17;
Baudrate = speeds[c];

return(status);
}

/*
* Return the number of characters waiting in TTY input buffer
*/
rdchk()
{
int status;
struct tt_io_iosb iosb;
struct tt_io_tacf typeahead;

status = sys$qiow(0, tt_chan, IO$_SENSEMODE|IO$M_TYPEAHDCNT,
&iosb, NULL, 0,
&typeahead, 0,
0, 0, 0, 0);

return(typeahead.byte_count);
}

/*
* Read NCHAR characters from the terminal without echoing or
* interpretation.
* If the argument SECONDS is non-zero, use that as the
* timeout period in seconds for the read.
*
* Returns SS$_TIMEOUT in case of timeout or other error.
* Otherwise, returns the number of characters read.
*/
raw_read(nchar, charbuf, seconds)
char *charbuf;
int nchar;
unsigned seconds;
{
short function;
int status;
struct tt_io_iosb iosb;

if (tt_chan == -1)
assign_channel();

function = IO$_READVBLK | IO$M_NOECHO | IO$M_NOFILTR;

if (seconds)
status = sys$qiow(0, tt_chan, function | IO$M_TIMED,
&iosb, NULL, 0,
charbuf, nchar, seconds,
&termin_mask, NULL, 0);
else
status = sys$qiow(0, tt_chan, function,
&iosb, NULL, 0,
charbuf, nchar, 0,
&termin_mask, NULL, 0);

if (iosb.byte_count)
return iosb.byte_count;
return SS$_TIMEOUT;
}

/*
* Writes a character to the terminal without echoing or
* interpretation.
*/
raw_write(c)
char c;
{
int status;
struct tt_io_iosb iosb;

if (tt_chan == -1)
assign_channel();

status = sys$qiow(0, tt_chan,
IO$_WRITEVBLK | IO$M_CANCTRLO | IO$M_NOFORMAT,
&iosb, NULL, 0,
&c, 1, 0, 0, 0, 0);

if (status != SS$_NORMAL || iosb.status != SS$_NORMAL)
fatal("RAW_WRITE: write QIO error return.\n");

return;
}

/*
* Writes a buffer to the terminal without echoing or
* interpretation.
*/
raw_wbuf(nchar, charbuf)
char *charbuf;
int nchar;
{
int status;
struct tt_io_iosb iosb;

if (tt_chan == -1)
assign_channel();

status = sys$qiow(0, tt_chan,
IO$_WRITEVBLK | IO$M_CANCTRLO | IO$M_NOFORMAT,
&iosb, NULL, 0,
charbuf, nchar, 0, 0, 0, 0);

if (status != SS$_NORMAL || iosb.status != SS$_NORMAL)
fatal("RAW_WRITE: write QIO error return.\n");

return;
}

/*
* Sets terminal information from VMS.
* Modified 12-85 Larry Farr/Chuck Forsberg to not use
* bad parity returned by VMS 4.
*/
stty(tt_characteristics)
struct tt_info *tt_characteristics;
{
short *f_ptr, /* *p_ptr, */ *s_ptr;
int status;
struct tt_mode_iosb iosb;

if (tt_chan == -1)
assign_channel();

/*
* We do the following in order to get a full short, concatenating
* two adjacent chars:
*/
s_ptr = &(tt_characteristics->dev_modes.t_speed); /* Speeds */
f_ptr = &(tt_characteristics->dev_modes.CR_fill); /* Fills */
/* p_ptr = &(tt_characteristics->dev_modes.parity_flags); */

status = sys$qiow(0, tt_chan, IO$_SETMODE,
&iosb, NULL, 0,
&(tt_characteristics->dev_characteristics), 12,
/* *s_ptr, *f_ptr, *p_ptr, 0); */
*s_ptr, *f_ptr, 0, 0);
if (status != SS$_NORMAL || iosb.status != SS$_NORMAL)
printf("STTY: set mode QIO returned %d\n", status);

return(status);
}



  3 Responses to “Category : UNIX Files
Archive   : RZSZ.ZIP
Filename : VVMODEM.C

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