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/************************************************************************
*
* POW C socket/XPA driver
*
* Use this code to make an XPA connection to a POW process and
* send pow scripting commands.
*
***********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <float.h>
#include <xpa.h>
int openPowConnection ( void );
void closePowConnection ( void );
int sendSetCmdToPow ( char *cmd, char *buf, int buflen );
int sendGetCmdToPow ( char *cmd, char **rtnBuf, int *bufLen );
int postProcessCall ( int got, char **names, char **messages );
#define NXPA 1
static XPA powConnection = NULL;
static char *powAddress = NULL;
int openPowConnection()
{
extern XPA powConnection;
char *rtnBuf;
int bufLen;
if( !powAddress ) {
powAddress = getenv( "POW_DISPLAY" );
if( !powAddress || strlen(powAddress)==0 ) {
/* POW_DISPLAY not defined, must depend on a name server */
powAddress = "pow";
}
}
powConnection = XPAOpen( NULL );
if( sendGetCmdToPow( "version", &rtnBuf, &bufLen )<0 ) {
system("POWplot &");
sendSetCmdToPow( "scope 0", NULL, 0);
sleep(3);
if( sendGetCmdToPow( "version", &rtnBuf, &bufLen )<0 ) {
sleep(3);
if( sendGetCmdToPow( "version", &rtnBuf, &bufLen )<0 ) {
return 1;
}
}
}
free( rtnBuf );
return 0;
}
void closePowConnection()
{
extern XPA powConnection;
XPAClose( powConnection );
powConnection = NULL;
}
int sendGetCmdToPow( char *cmd, char **rtnBuf, int *bufLen)
{
int got, stat=0;
char *bufs[NXPA];
char *names[NXPA];
char *messages[NXPA];
int lens[NXPA];
extern XPA powConnection;
extern char *powAddress;
/* Flush 'sendSet' command cache */
stat = sendSetCmdToPow( NULL, NULL, -1 );
if( !stat ) {
got = XPAGet(powConnection, powAddress, cmd, "",
bufs, lens, names, messages, NXPA);
if( got==0 )
stat = -1;
else
stat = postProcessCall(got, names, messages);
*rtnBuf = bufs[0];
*bufLen = lens[0];
}
return stat;
}
int sendSetCmdToPow( char *cmd, char *buf, int buflen )
{
int got, len, stat=0;
char *names[NXPA];
char *messages[NXPA];
extern XPA powConnection;
extern char *powAddress;
static char *cache = NULL;
static int cachePos = 0;
static int cacheSize = 0;
switch ( buflen ) {
case -2: /* Free the cache */
free(cache);
cache = NULL;
cachePos = cacheSize = 0;
break;
case -1: /* Flush the cache */
if( cachePos ) {
len = cachePos;
cachePos = 0;
stat = sendSetCmdToPow( "tcl", cache, len );
}
break;
case 0: /* No data, so just cache command */
len = strlen(cmd);
if( cachePos + len + 2 > cacheSize ) {
cacheSize += 4096 + len;
if( cache ) {
cache = (char*) realloc( cache, sizeof(char) * cacheSize );
} else {
cache = (char*) malloc( sizeof(char) * cacheSize );
}
}
cache[cachePos++] = '\n';
strcpy( cache+cachePos, cmd );
cachePos += len;
if( cachePos>60000 ) {
/* Flush the cache */
stat = sendSetCmdToPow( NULL, NULL, -1 );
}
break;
default: /* Data being sent */
if( cachePos ) {
/* Flush cache first */
stat = sendSetCmdToPow( NULL, NULL, -1 );
}
if( !stat ) {
got = XPASet(powConnection, powAddress, cmd, "", buf, buflen,
names, messages, NXPA);
if( got==0 )
stat = -1;
else
stat = postProcessCall(got, names, messages);
}
break;
}
return stat;
}
int postProcessCall( int got, char **names, char **messages )
{
int i, status=0;
for(i=0; i<got; i++){
if( messages[i] != NULL ) {
/* error processing */
fprintf(stderr, "ERROR: %s (%s)\n", messages[i], names[i]);
status = 1;
}
if( names[i] ) free(names[i]);
if( messages[i] ) free(messages[i]);
}
return status;
}
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