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ULIB.C
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C/C++ Source or Header
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1993-10-03
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22KB
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608 lines
/*--------------------------------------------------------------------*/
/* u l i b . c */
/* */
/* Serial port interface to COMMFIFO.ASM for MS-DOS */
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* Changes Copyright (c) 1989-1993 by Kendra Electronic */
/* Wonderworks. */
/* */
/* All rights reserved except those explicitly granted by the */
/* UUPC/extended license agreement. */
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* RCS Information */
/*--------------------------------------------------------------------*/
/*
* $Id: ulib.c 1.18 1993/10/03 22:09:09 ahd Exp $
*
* $Log: ulib.c $
* Revision 1.18 1993/10/03 22:09:09 ahd
* Use unsigned long to display speed
*
* Revision 1.17 1993/09/29 13:18:06 ahd
* Use new dummy setprty function
*
* Revision 1.16 1993/09/27 04:04:06 ahd
* Normalize references to modem speed to avoid incorrect displays
*
* Revision 1.15 1993/09/27 00:45:20 ahd
* Cosmetic clean up
*
* Revision 1.14 1993/09/25 03:07:56 ahd
* Add dummy priority function
*
* Revision 1.13 1993/07/11 14:38:32 ahd
* Correct routine names in displayed messages
*
* Revision 1.12 1993/05/30 15:25:50 ahd
* Multiple driver support
*
* Revision 1.11 1993/05/30 00:08:03 ahd
* Multiple communications drivers support
* Don't lock port if not in multi-task mode
* Break trace functions out of ulib.c into commlib.c
*
* Revision 1.10 1993/05/09 03:41:47 ahd
* Make swrite accept constant input strings
*
* Revision 1.9 1993/04/11 00:33:54 ahd
* Global edits for year, TEXT, etc.
*
* Revision 1.8 1993/04/05 04:35:40 ahd
* Set/clear abort processing flags in modem.c
*
* Revision 1.7 1993/01/23 19:08:09 ahd
* Don't attempt to detect lost carrier in sread()
*
* Revision 1.6 1992/12/30 05:27:11 plummer
* MS C compile fixes
* Add CD() to sread
*
* Revision 1.5 1992/12/12 16:12:13 ahd
* Include header file for definition for memory avail routines
*
* Revision 1.4 1992/12/07 02:43:20 ahd
* Improve error message when low memory prevents COMM port install
*
* Revision 1.3 1992/11/29 22:09:10 ahd
* Use sopen() rather than FOPEN() to avoid retries on comm port
*
* Revision 1.2 1992/11/21 06:17:42 ahd
* Delete old (pre-COMMFIFO) autobaud function
*
*/
/*--------------------------------------------------------------------*/
/* System include files */
/*--------------------------------------------------------------------*/
#include <fcntl.h>
#include <io.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <share.h>
#ifdef __TURBOC__
#include <alloc.h>
#endif
/*--------------------------------------------------------------------*/
/* UUPC/extended include files */
/*--------------------------------------------------------------------*/
#include "lib.h"
#include "hlib.h"
#include "ulib.h"
#include "comm.h"
#include "ssleep.h"
#include "catcher.h"
#include "commlib.h"
/*--------------------------------------------------------------------*/
/* Internal prototypes */
/*--------------------------------------------------------------------*/
static void ShowModem( void );
/*--------------------------------------------------------------------*/
/* Global variables */
/*--------------------------------------------------------------------*/
static unsigned short current_bps;
static char current_direct;
static boolean carrierdetect;
currentfile();
/* IBM-PC I/O routines */
/* "DCP" a uucp clone. Copyright Richard H. Lamb 1985,1986,1987 */
/*************** BASIC I/O ***************************/
/* Saltzers serial package (aka Info-IBMPC COM_PKG2):
* Some notes: When packets are flying in both directions, there seems to
* be some interrupt handling problems as far as receiving. Checksum errors
* may therefore occur often even though we recover from them. This is
* especially true with sliding windows. Errors are very few in the VMS
* version. RH Lamb
*/
#define STOPBIT 1
static int com_handle;
static boolean hangup_needed = TRUE;
/*--------------------------------------------------------------------*/
/* n o p e n l i n e */
/* */
/* Open the serial port for I/O */
/*--------------------------------------------------------------------*/
int nopenline(char *name, BPS bps, const boolean direct)
{
int value;
if (portActive) /* Was the port already active? */
closeline(); /* Yes --> Shutdown it before open */
printmsg(15, "openline: %s, %lu", name, bps);
current_direct = (char) (direct ? 'D' : 'M') ;
if (sscanf(name, "COM%d", &value) != 1)
{
printmsg(0,"Communications port must be format COMx, was %s",
name);
panic();
}
if ( bflag[F_MULTITASK] )
{
com_handle = sopen( name, O_BINARY | O_RDWR, SH_DENYRW );
/* Used soly for lock abilities */
if ( com_handle == -1 )
{
printerr( name );
return 1;
}
}
select_port(value);
save_com();
if (!install_com())
{
printmsg(0,"Communications handler install failed; "
"probable cause ... memory shortage.");
#ifdef __TURBOC__
printmsg(0,"FAR DOS Memory free = %ld bytes",
farcoreleft() );
#endif
return 1;
}
current_bps = bps;
open_com(current_bps, current_direct, 'N', STOPBIT, 'D');
dtr_on();
ssleep(2); /* Wait two seconds as required by V.24 */
carrierdetect = FALSE; /* No modem connected yet */
traceStart( name );
portActive = TRUE; /* record status for error handler */
return 0;
} /* nopenline */
/*--------------------------------------------------------------------*/
/* n s r e a d */
/* */
/* Read from the serial port */
/* */
/* Non-blocking read essential to "g" protocol. See */
/* "dcpgpkt.c" for description. This all changes in a */
/* multi-tasking system. Requests for I/O should get queued */
/* and an event flag given. Then the requesting process (e.g. */
/* gmachine()) waits for the event flag to fire processing */
/* either a read or a write. Could be implemented on VAX/VMS */
/* or DG but not MS-DOS. */
/*--------------------------------------------------------------------*/
unsigned int nsread(char *input,
unsigned int wanted,
unsigned int timeout)
{
time_t start;
hangup_needed = TRUE;
start = time(nil(time_t)); /* Remember when we started processing */
/*--------------------------------------------------------------------*/
/* Report the current modem status */
/*---------------------------------