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/* nexsup.c--This is a 'support routine' used by the nedriv.f code, */
/* In brief, this is the main interface between the Fortran and */
/* C languages. It is called from Fortran and uses a UNIX socket */
/* to send messages to the PGPLOT viewer. */
/* 199-Feb-24 - update from nexsup.m - [AFT] */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/time.h>
#include <netdb.h>
#include <stdio.h>
int pgsock=-1;
struct sockaddr_in server;
#ifdef __STDC__
void grgetreply(int ifunc,int *ibuf,int *lbuf)
#else
void grgetreply(ifunc, ibuf, lbuf)
int ifunc;
int *ibuf;
int *lbuf;
#endif
{
/* Used by nexsup to send a message over the socket and wait */
/* for a reply back */
struct sockaddr_in replyadd;
struct pgmess {
unsigned char c1func;
unsigned char c1len;
char cmess[256];
};
struct pgmess sbuf;
int msgsock, repsock;
int i, itmp;
/* We need a socket that pgview can reply to. Create descriptor. */
repsock = socket(AF_INET, SOCK_STREAM, 0);
if (repsock < 0) {
perror("opening stream socket");
exit(1);
}
/* Name socket using wildcards */
replyadd.sin_family = AF_INET;
replyadd.sin_addr.s_addr = INADDR_ANY;
replyadd.sin_port = 0;
if (bind(repsock, (struct sockaddr *)&replyadd, sizeof(replyadd))) {
perror("binding stream socket");
exit(1);
}
/* Find out assigned port number so we can forward to the server. */
itmp = sizeof(replyadd);
if (getsockname(repsock, (struct sockaddr *)&replyadd, &itmp)) {
perror("getting socket name");
exit(1);
}
/* Start accepting connections */
listen(repsock, 5);
/* Now tell pgview the port that we are listen'ing on. Note, the port */
/* number is already in network byte order which is what pgview needs. */
sbuf.c1func = ifunc;
sbuf.c1len = 2;
memcpy(sbuf.cmess, &replyadd.sin_port, 2);
if (write(pgsock, &sbuf, sbuf.c1len+2) < 0)
perror("writing on stream socket");
/* Now wait for the reply */
msgsock = accept(repsock, (struct sockaddr *)0, (int *)0);
if (msgsock == -1)
perror("accept");
else {
*lbuf = read(msgsock, ibuf, 16);
}
close(msgsock);
return;
}
#ifdef __STDC__
void nexsup_(int *ifunc, char *cbuf, float rtmp[], int len_cbuf)
#else
void nexsup_(ifunc, cbuf, rtmp, len_cbuf)
int *ifunc;
char *cbuf;
float rtmp[];
int len_cbuf;
#endif
{
struct hostent *hp;
struct pgmess {
unsigned char c1func;
unsigned char c1len;
char cmess[256];
};
struct pgmess sbuf;
char *cdis, *cview;
char cloc[256];
int ibuf[10];
int i, icnt, itmp, lbuf, lloc;
if ( pgsock<0 ) {
icnt = 0;
do {
/* Create socket descriptor. */
pgsock = socket(AF_INET, SOCK_STREAM, 0);
if ( pgsock < 0) {
perror("opening stream socket");
}
/* Create socket address structure */
server.sin_family = AF_INET;
cdis = (char *) getenv("DISPLAY");
if ( cdis==NULL )
cdis="localhost";
else {
/* Convert a colon to null (end of string) */
for (i=0; i<strlen(cdis); i++) {
if ( cdis[i]==':' ) cdis[i]='\0';
}
}
hp = gethostbyname(cdis);
if (hp == 0) {
fprintf(stderr, "%s: unknown host", cdis);
}
memcpy(&server.sin_addr, hp->h_addr, hp->h_length);
server.sin_port = htons(7974);
/* Connect descriptor to address */
itmp=connect(pgsock,(struct sockaddr *)&server,sizeof(server));
if ( itmp<0 ) {
close(pgsock);
if ( icnt==0 ) {
cview = (char *) getenv("PGVIEW");
if ( cdis==NULL || cview!=NULL ) {
/* If PGVIEW is defined or DISPLAY is not defined, then try to launch pgview */
printf("Launching pgview...\n");
if ( cview==NULL ) cview="/LocalApps/pgview.app/pgview";
strcpy(cloc, cview);
lloc=strlen(cloc);
cloc[lloc]=' ';
cloc[lloc+1]='&';
cloc[lloc+2]='\0';
system(cloc);
} else {
printf("Please launch pgview on your display system.\n");
}
}
sleep(1);
if((icnt/5)*5 == icnt) printf("waiting...\n");
icnt=icnt+1;
}
} while (itmp<0 && icnt<20);
if ( itmp < 0 ) {
printf("Could not find port connected to pgview.\n");
exit(1);
}
}
switch (*ifunc) {
case 1:
grgetreply(1, ibuf, &lbuf);
rtmp[0]=(float)ntohl(ibuf[0]);
rtmp[1]=(float)ntohl(ibuf[1]);
rtmp[2]=(float)ntohl(ibuf[2]);
rtmp[3]=(float)ntohl(ibuf[3]);
break;
case 2:
sbuf.c1func = 2;
sbuf.c1len = 0;
if (write(pgsock, &sbuf, sbuf.c1len+2) < 0)
perror("writing on stream socket");
break;
case 3:
/* Make sure we send the null character at the end. */
itmp=strlen(cbuf)+1;
sbuf.c1func = 3;
sbuf.c1len = itmp;
memcpy(sbuf.cmess, cbuf, itmp);
if (write(pgsock, &sbuf, sbuf.c1len+2) < 0)
perror("writing on stream socket");
break;
case 4:
grgetreply(4, ibuf, &lbuf);
rtmp[0]=(float)ntohl(ibuf[0]);
rtmp[1]=(float)ntohl(ibuf[1]);
rtmp[2]=(float)ntohl(ibuf[2]);
break;
case 5:
sbuf.c1func = 5;
sbuf.c1len = 0;
if (write(pgsock, &sbuf, sbuf.c1len+2) < 0)
perror("writing on stream socket");
break;
case 6:
sbuf.c1func = 6;
sbuf.c1len = 0;
if (write(pgsock, &sbuf, sbuf.c1len+2) < 0)
perror("writing on stream socket");
break;
case 7:
close(pgsock);
pgsock=-1;
break;
default :
printf("nexsup--Unknown function code= %d\n",*ifunc);
break;
}
}
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