src/hd/rhdisp.c

/* Copyright (c) 1997 Silicon Graphics, Inc. */

#ifndef lint
static char SCCSid[] = "$SunId$ SGI";
#endif

/*
 * Holodeck display process.
 */

#include "rholo.h"
#include "rhdisp.h"
#include "rhdriver.h"
#include "selcall.h"
#include <ctype.h>

#ifndef VIEWHISTLEN
#define VIEWHISTLEN     2       /* number of remembered views */
#endif

HOLO    *hdlist[HDMAX+1];       /* global holodeck list */

char    cmdlist[DC_NCMDS][8] = DC_INIT;

int     imm_mode = 0;           /* bundles are being delivered immediately */

char    *progname;              /* global argv[0] */

FILE    *sstdin, *sstdout;      /* server's standard input and output */

#define RDY_SRV         01
#define RDY_DEV         02
#define RDY_SIN         04


main(argc, argv)
int     argc;
char    *argv[];
{
        extern int      eputs();
        int     rdy, inp, res = 0, pause = 0;

        progname = argv[0];
        if (argc < 3)
                error(USER, "bad command line arguments");
                                        /* open our device */
        dev_open(argv[1]);
                                        /* open server process i/o */
        sstdout = fdopen(atoi(argv[2]), "w");
        if (argc < 4 || (inp = atoi(argv[3])) < 0)
                sstdin = NULL;
        else
                sstdin = fdopen(inp, "r");
                                        /* set command error vector */
        erract[COMMAND].pf = eputs;
                                        /* enter main loop */
        do {
                rdy = disp_wait();
                if (rdy & RDY_DEV) {            /* user input from driver */
                        inp = dev_input();
                        if (inp & DFL(DC_SETVIEW))
                                new_view(&odev.v);
                        if (inp & DFL(DC_GETVIEW))
                                printview();
                        if (inp & DFL(DC_LASTVIEW))
                                new_view(NULL);
                        if (inp & DFL(DC_PAUSE))
                                pause = 1;
                        if (inp & DFL(DC_RESUME)) {
                                serv_request(DR_NOOP, 0, NULL);
                                pause = 0;
                        }
                        if (inp & DFL(DC_REDRAW))
                                imm_mode = beam_sync() > 0;
                        if (inp & DFL(DC_QUIT))
                                serv_request(DR_SHUTDOWN, 0, NULL);
                }
                if (rdy & RDY_SIN)              /* user input from sstdin */
                        switch (usr_input()) {
                        case DC_PAUSE:
                                pause = 1;
                                break;
                        case DC_RESUME:
                                serv_request(DR_NOOP, 0, NULL);
                                pause = 0;
                                break;
                        }
                if (rdy & RDY_SRV) {            /* process server result */
                        res = serv_result();
                        if (pause && res != DS_SHUTDOWN) {
                                serv_request(DR_ATTEN, 0, NULL);
                                while ((res = serv_result()) != DS_ACKNOW &&
                                                res != DS_SHUTDOWN)
                                        ;
                        }
                }
        } while (res != DS_SHUTDOWN);
                                        /* all done */
        quit(0);
}


int
disp_wait()                     /* wait for more input */
{
        fd_set  readset, errset;
        int     flgs;
        int     n;
        register int    i;
                                /* see if we can avoid select call */
        if (imm_mode || stdin->_cnt > 0)
                return(RDY_SRV);
        if (sstdin != NULL && sstdin->_cnt > 0)
                return(RDY_SIN);
        if (dev_flush())
                return(RDY_DEV);
                                /* make the call */
        FD_ZERO(&readset); FD_ZERO(&errset);
        FD_SET(0, &readset);
        FD_SET(0, &errset);
        FD_SET(odev.ifd, &readset);
        FD_SET(odev.ifd, &errset);
        n = odev.ifd+1;
        if (sstdin != NULL) {
                FD_SET(fileno(sstdin), &readset);
                if (fileno(sstdin) >= n)
                        n = fileno(sstdin) + 1;
        }
        n = select(n, &readset, NULL, &errset, NULL);
        if (n < 0) {
                if (errno == EINTR)
                        return(0);
                error(SYSTEM, "select call failure in disp_wait");
        }
        flgs = 0;               /* flag what's ready */
        if (FD_ISSET(0, &readset) || FD_ISSET(0, &errset))
                flgs |= RDY_SRV;
        if (FD_ISSET(odev.ifd, &readset) || FD_ISSET(odev.ifd, &errset))
                flgs |= RDY_DEV;
        if (sstdin != NULL && FD_ISSET(fileno(sstdin), &readset))
                flgs |= RDY_SIN;
        return(flgs);
}


add_holo(hdg)                   /* register a new holodeck section */
HDGRID  *hdg;
{
        VIEW    nv;
        register int    hd;

        for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
                ;
        if (hd >= HDMAX)
                error(INTERNAL, "too many holodeck sections in add_holo");
        hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
        if (hdlist[hd] == NULL)
                error(SYSTEM, "out of memory in add_holo");
        bcopy((char *)hdg, (char *)hdlist[hd], sizeof(HDGRID));
        hdcompgrid(hdlist[hd]);
        if (hd)
                return;
                                        /* set initial viewpoint */
        copystruct(&nv, &odev.v);
        VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
        VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
        VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
        fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
        VCOPY(nv.vup, hdlist[0]->xv[2]);
        new_view(&nv);
}


disp_bundle(p)                  /* display a ray bundle */
register PACKHEAD       *p;
{
        GCOORD  gc[2];
        FVECT   ro, rd, wp;
        double  d;
        register int    i;
                                        /* get beam coordinates */
        if (p->hd < 0 | p->hd >= HDMAX || hdlist[p->hd] == NULL)
                error(INTERNAL, "bad holodeck number in disp_bundle");
        if (!hdbcoord(gc, hdlist[p->hd], p->bi))
                error(INTERNAL, "bad beam index in disp_bundle");
                                        /* display each ray */
        for (i = p->nr; i--; ) {
                hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
                d = hddepth(hdlist[p->hd], packra(p)[i].d);
                VSUM(wp, ro, rd, d);            /* might be behind viewpoint */
                dev_value(packra(p)[i].v, wp, rd);
        }
}


new_view(v)                     /* change view parameters */
register VIEW   *v;
{
        static VIEW     viewhist[VIEWHISTLEN];
        static unsigned nhist;
        char    *err;
                                /* restore previous view? */
        if (v == NULL) {
                if (nhist < 2) {
                        error(COMMAND, "no previous view");
                        return;
                }
                nhist--;        /* get one before last setting */
                v = viewhist + ((nhist-1)%VIEWHISTLEN);
        } else if ((err = setview(v)) != NULL) {
                error(COMMAND, err);
                return;
        }
again:
        if (v->type == VT_PAR) {
                error(COMMAND, "cannot handle parallel views");
                return;
        }
        if (!dev_view(v))       /* update display driver */
                goto again;
        dev_flush();            /* update screen */
        if (!beam_view(v))      /* update beam list */
                goto again;
                                /* record new view */
        if (v < viewhist || v >= viewhist+VIEWHISTLEN) {
                copystruct(viewhist + (nhist%VIEWHISTLEN), v);
                nhist++;
        }
}


int
usr_input()                     /* get user input and process it */
{
        VIEW    vparams;
        char    cmd[128];
        register char   *args;
        register int    i;

        if (fgets(cmd, sizeof(cmd), sstdin) == NULL)
                return(DC_QUIT);
        for (args = cmd; *args && !isspace(*args); args++)
                ;
        while (isspace(*args))
                *args++ = '\0';
        if (!*cmd)
                return(DC_RESUME);
        if (*args && args[i=strlen(args)-1] == '\n')
                args[i] = '\0';
        for (i = 0; i < DC_NCMDS; i++)
                if (!strcmp(cmd, cmdlist[i]))
                        break;
        if (i >= DC_NCMDS) {
                sprintf(errmsg, "unknown command: %s", cmd);
                error(COMMAND, errmsg);
                return(-1);
        }
        switch (i) {
        case DC_SETVIEW:                /* set the view */
                copystruct(&vparams, &odev.v);
                if (!sscanview(&vparams, args))
                        error(COMMAND, "missing view options");
                else
                        new_view(&vparams);
                break;
        case DC_GETVIEW:                /* print the current view */
                printview();
                break;
        case DC_LASTVIEW:               /* restore previous view */
                new_view(NULL);
                break;
        case DC_PAUSE:                  /* pause the current calculation */
        case DC_RESUME:                 /* resume the calculation */
                /* handled in main() */
                break;
        case DC_REDRAW:                 /* redraw from server */
                imm_mode = beam_sync() > 0;
                break;
        case DC_QUIT:                   /* quit request */
                serv_request(DR_SHUTDOWN, 0, NULL);
                break;
        default:
                error(CONSISTENCY, "bad command id in usr_input");
        }
        return(i);
}


printview()                     /* print our current view to server stdout */
{
        fputs(VIEWSTR, sstdout);
        fprintview(&odev.v, sstdout);
        fputc('\n', sstdout);
        fflush(sstdout);
}


int
serv_result()                   /* get next server result and process it */
{
        static char     *buf = NULL;
        static int      bufsiz = 0;
        MSGHEAD msg;
        int     n;
                                        /* read message header */
        if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
                goto readerr;
        if (msg.nbytes > 0) {           /* get the message body */
                if (msg.nbytes > bufsiz) {
                        if (buf == NULL)
                                buf = (char *)malloc(bufsiz=msg.nbytes);
                        else
                                buf = (char *)realloc(buf, bufsiz=msg.nbytes);
                        if (buf == NULL)
                                error(SYSTEM, "out of memory in serv_result");
                }
                if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
                        goto readerr;
        }
        switch (msg.type) {             /* process results */
        case DS_BUNDLE:
                if (msg.nbytes < sizeof(PACKHEAD) ||
                                msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
                        error(INTERNAL, "bad display packet from server");
                disp_bundle((PACKHEAD *)buf);
                break;
        case DS_ADDHOLO:
                if (msg.nbytes != sizeof(HDGRID))
                        error(INTERNAL, "bad holodeck record from server");
                add_holo((HDGRID *)buf);
                break;
        case DS_STARTIMM:
        case DS_ENDIMM:
                imm_mode = msg.type==DS_STARTIMM;
                if (msg.type == DS_ENDIMM)
                        dev_flush();            /* update display NOW */
                /* fall through */
        case DS_ACKNOW:
        case DS_SHUTDOWN:
                if (msg.nbytes) {
                        sprintf(errmsg,
                                "unexpected body with server message %d",
                                        msg.type);
                        error(INTERNAL, errmsg);
                }
                break;
        default:
                error(INTERNAL, "unrecognized result from server process");
        }
        return(msg.type);               /* return message type */
readerr:
        if (feof(stdin))
                error(SYSTEM, "server process died");
        error(SYSTEM, "error reading from server process");
}


serv_request(type, nbytes, p)   /* send a request to the server process */
int     type, nbytes;
char    *p;
{
        MSGHEAD msg;
        int     m;
                                /* get server's attention for big request */
        if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
                serv_request(DR_ATTEN, 0, NULL);
                while ((m = serv_result()) != DS_ACKNOW)
                        if (m == DS_SHUTDOWN)   /* the bugger quit on us */
                                quit(0);
        }
        msg.type = type;        /* write and flush the message */
        msg.nbytes = nbytes;
        fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
        if (nbytes > 0)
                fwrite(p, 1, nbytes, stdout);
        if (fflush(stdout) < 0)
                error(SYSTEM, "write error in serv_request");
}


eputs(s)                        /* put error message to stderr */
register char  *s;
{
        static int  midline = 0;

        if (!*s)
                return;
        if (!midline++) {       /* prepend line with program name */
                fputs(progname, stderr);
                fputs(": ", stderr);
        }
        fputs(s, stderr);
        if (s[strlen(s)-1] == '\n') {
                fflush(stderr);
                midline = 0;
        }
}


quit(code)                      /* clean up and exit */
int     code;
{
        if (odev.v.type)
                dev_close();
        exit(code);
}
Revision:	3.13
Committed:	Thu Dec 11 16:45:58 1997 UTC (26 years, 4 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 3.12:	+13 -10 lines
Log Message:	normalized commands between driver and standard input
#	User	Rev	Content
1	gregl	3.1	/* Copyright (c) 1997 Silicon Graphics, Inc. */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ SGI";
5			#endif
6
7			/*
8			* Holodeck display process.
9			*/
10
11			#include "rholo.h"
12			#include "rhdisp.h"
13			#include "rhdriver.h"
14			#include "selcall.h"
15	gregl	3.10	#include <ctype.h>
16	gregl	3.1
17	gregl	3.12	#ifndef VIEWHISTLEN
18			#define VIEWHISTLEN 2 /* number of remembered views */
19			#endif
20
21	gregl	3.1	HOLO hdlist[HDMAX+1]; / global holodeck list */
22
23	gregl	3.10	char cmdlist[DC_NCMDS][8] = DC_INIT;
24
25	gregl	3.1	int imm_mode = 0; /* bundles are being delivered immediately */
26
27			char progname; / global argv[0] */
28
29	gregl	3.10	FILE sstdin, sstdout; /* server's standard input and output */
30	gregl	3.1
31	gregl	3.10	#define RDY_SRV 01
32			#define RDY_DEV 02
33			#define RDY_SIN 04
34	gregl	3.1
35	gregl	3.10
36	gregl	3.1	main(argc, argv)
37			int argc;
38			char *argv[];
39			{
40	gregl	3.10	extern int eputs();
41	gregl	3.3	int rdy, inp, res = 0, pause = 0;
42	gregl	3.1
43			progname = argv[0];
44	gregl	3.10	if (argc < 3)
45	gregl	3.1	error(USER, "bad command line arguments");
46			/* open our device */
47			dev_open(argv[1]);
48	gregl	3.10	/* open server process i/o */
49			sstdout = fdopen(atoi(argv[2]), "w");
50			if (argc < 4 \|\| (inp = atoi(argv[3])) < 0)
51			sstdin = NULL;
52			else
53			sstdin = fdopen(inp, "r");
54			/* set command error vector */
55			erract[COMMAND].pf = eputs;
56	gregl	3.1	/* enter main loop */
57			do {
58			rdy = disp_wait();
59	gregl	3.10	if (rdy & RDY_DEV) { /* user input from driver */
60	gregl	3.3	inp = dev_input();
61	gregl	3.13	if (inp & DFL(DC_SETVIEW))
62			new_view(&odev.v);
63			if (inp & DFL(DC_GETVIEW))
64	gregl	3.10	printview();
65	gregl	3.13	if (inp & DFL(DC_LASTVIEW))
66	gregl	3.12	new_view(NULL);
67	gregl	3.13	if (inp & DFL(DC_PAUSE))
68	gregl	3.3	pause = 1;
69	gregl	3.13	if (inp & DFL(DC_RESUME)) {
70	gregl	3.3	serv_request(DR_NOOP, 0, NULL);
71			pause = 0;
72			}
73	gregl	3.13	if (inp & DFL(DC_REDRAW))
74			imm_mode = beam_sync() > 0;
75			if (inp & DFL(DC_QUIT))
76			serv_request(DR_SHUTDOWN, 0, NULL);
77	gregl	3.3	}
78	gregl	3.10	if (rdy & RDY_SIN) /* user input from sstdin */
79			switch (usr_input()) {
80			case DC_PAUSE:
81			pause = 1;
82			break;
83			case DC_RESUME:
84			serv_request(DR_NOOP, 0, NULL);
85			pause = 0;
86			break;
87			}
88			if (rdy & RDY_SRV) { /* process server result */
89	gregl	3.3	res = serv_result();
90			if (pause && res != DS_SHUTDOWN) {
91	gregl	3.2	serv_request(DR_ATTEN, 0, NULL);
92	gregl	3.3	while ((res = serv_result()) != DS_ACKNOW &&
93			res != DS_SHUTDOWN)
94			;
95			}
96	gregl	3.2	}
97	gregl	3.1	} while (res != DS_SHUTDOWN);
98			/* all done */
99			quit(0);
100			}
101
102
103			int
104			disp_wait() /* wait for more input */
105			{
106			fd_set readset, errset;
107			int flgs;
108			int n;
109			register int i;
110			/* see if we can avoid select call */
111			if (imm_mode \|\| stdin->_cnt > 0)
112	gregl	3.4	return(RDY_SRV);
113	gregl	3.10	if (sstdin != NULL && sstdin->_cnt > 0)
114			return(RDY_SIN);
115	gregl	3.1	if (dev_flush())
116	gregl	3.4	return(RDY_DEV);
117	gregl	3.1	/* make the call */
118			FD_ZERO(&readset); FD_ZERO(&errset);
119			FD_SET(0, &readset);
120			FD_SET(0, &errset);
121			FD_SET(odev.ifd, &readset);
122			FD_SET(odev.ifd, &errset);
123	gregl	3.10	n = odev.ifd+1;
124			if (sstdin != NULL) {
125			FD_SET(fileno(sstdin), &readset);
126			if (fileno(sstdin) >= n)
127			n = fileno(sstdin) + 1;
128			}
129	gregl	3.1	n = select(n, &readset, NULL, &errset, NULL);
130			if (n < 0) {
131			if (errno == EINTR)
132			return(0);
133			error(SYSTEM, "select call failure in disp_wait");
134			}
135			flgs = 0; /* flag what's ready */
136			if (FD_ISSET(0, &readset) \|\| FD_ISSET(0, &errset))
137	gregl	3.4	flgs \|= RDY_SRV;
138	gregl	3.1	if (FD_ISSET(odev.ifd, &readset) \|\| FD_ISSET(odev.ifd, &errset))
139	gregl	3.4	flgs \|= RDY_DEV;
140	gregl	3.10	if (sstdin != NULL && FD_ISSET(fileno(sstdin), &readset))
141			flgs \|= RDY_SIN;
142	gregl	3.1	return(flgs);
143			}
144
145
146			add_holo(hdg) /* register a new holodeck section */
147			HDGRID *hdg;
148			{
149			VIEW nv;
150			register int hd;
151
152			for (hd = 0; hd < HDMAX && hdlist[hd] != NULL; hd++)
153			;
154			if (hd >= HDMAX)
155			error(INTERNAL, "too many holodeck sections in add_holo");
156			hdlist[hd] = (HOLO *)malloc(sizeof(HOLO));
157			if (hdlist[hd] == NULL)
158			error(SYSTEM, "out of memory in add_holo");
159			bcopy((char )hdg, (char )hdlist[hd], sizeof(HDGRID));
160			hdcompgrid(hdlist[hd]);
161			if (hd)
162			return;
163			/* set initial viewpoint */
164			copystruct(&nv, &odev.v);
165			VSUM(nv.vp, hdlist[0]->orig, hdlist[0]->xv[0], 0.5);
166			VSUM(nv.vp, nv.vp, hdlist[0]->xv[1], 0.5);
167			VSUM(nv.vp, nv.vp, hdlist[0]->xv[2], 0.5);
168			fcross(nv.vdir, hdlist[0]->xv[1], hdlist[0]->xv[2]);
169			VCOPY(nv.vup, hdlist[0]->xv[2]);
170			new_view(&nv);
171			}
172
173
174			disp_bundle(p) /* display a ray bundle */
175			register PACKHEAD *p;
176			{
177			GCOORD gc[2];
178			FVECT ro, rd, wp;
179			double d;
180			register int i;
181			/* get beam coordinates */
182			if (p->hd < 0 \| p->hd >= HDMAX \|\| hdlist[p->hd] == NULL)
183			error(INTERNAL, "bad holodeck number in disp_bundle");
184			if (!hdbcoord(gc, hdlist[p->hd], p->bi))
185			error(INTERNAL, "bad beam index in disp_bundle");
186			/* display each ray */
187			for (i = p->nr; i--; ) {
188			hdray(ro, rd, hdlist[p->hd], gc, packra(p)[i].r);
189			d = hddepth(hdlist[p->hd], packra(p)[i].d);
190			VSUM(wp, ro, rd, d); /* might be behind viewpoint */
191	gregl	3.9	dev_value(packra(p)[i].v, wp, rd);
192	gregl	3.1	}
193			}
194
195
196			new_view(v) /* change view parameters */
197	gregl	3.12	register VIEW *v;
198	gregl	3.1	{
199	gregl	3.12	static VIEW viewhist[VIEWHISTLEN];
200			static unsigned nhist;
201	gregl	3.1	char *err;
202	gregl	3.12	/* restore previous view? */
203			if (v == NULL) {
204			if (nhist < 2) {
205			error(COMMAND, "no previous view");
206	gregl	3.10	return;
207			}
208	gregl	3.12	nhist--; /* get one before last setting */
209			v = viewhist + ((nhist-1)%VIEWHISTLEN);
210			} else if ((err = setview(v)) != NULL) {
211			error(COMMAND, err);
212			return;
213			}
214			again:
215			if (v->type == VT_PAR) {
216			error(COMMAND, "cannot handle parallel views");
217			return;
218			}
219			if (!dev_view(v)) /* update display driver */
220			goto again;
221			dev_flush(); /* update screen */
222			if (!beam_view(v)) /* update beam list */
223			goto again;
224			/* record new view */
225			if (v < viewhist \|\| v >= viewhist+VIEWHISTLEN) {
226			copystruct(viewhist + (nhist%VIEWHISTLEN), v);
227			nhist++;
228			}
229	gregl	3.10	}
230
231
232			int
233			usr_input() /* get user input and process it */
234			{
235			VIEW vparams;
236			char cmd[128];
237			register char *args;
238	gregl	3.11	register int i;
239	gregl	3.10
240			if (fgets(cmd, sizeof(cmd), sstdin) == NULL)
241			return(DC_QUIT);
242			for (args = cmd; args && !isspace(args); args++)
243			;
244			while (isspace(*args))
245			*args++ = '\0';
246			if (!*cmd)
247			return(DC_RESUME);
248	gregl	3.11	if (*args && args[i=strlen(args)-1] == '\n')
249			args[i] = '\0';
250			for (i = 0; i < DC_NCMDS; i++)
251			if (!strcmp(cmd, cmdlist[i]))
252	gregl	3.10	break;
253	gregl	3.11	if (i >= DC_NCMDS) {
254	gregl	3.10	sprintf(errmsg, "unknown command: %s", cmd);
255			error(COMMAND, errmsg);
256			return(-1);
257			}
258	gregl	3.11	switch (i) {
259	gregl	3.10	case DC_SETVIEW: /* set the view */
260			copystruct(&vparams, &odev.v);
261			if (!sscanview(&vparams, args))
262			error(COMMAND, "missing view options");
263			else
264			new_view(&vparams);
265			break;
266			case DC_GETVIEW: /* print the current view */
267			printview();
268	gregl	3.12	break;
269			case DC_LASTVIEW: /* restore previous view */
270			new_view(NULL);
271	gregl	3.10	break;
272			case DC_PAUSE: /* pause the current calculation */
273			case DC_RESUME: /* resume the calculation */
274			/* handled in main() */
275	gregl	3.13	break;
276			case DC_REDRAW: /* redraw from server */
277			imm_mode = beam_sync() > 0;
278	gregl	3.10	break;
279			case DC_QUIT: /* quit request */
280			serv_request(DR_SHUTDOWN, 0, NULL);
281			break;
282			default:
283			error(CONSISTENCY, "bad command id in usr_input");
284			}
285	gregl	3.11	return(i);
286	gregl	3.10	}
287
288
289			printview() /* print our current view to server stdout */
290			{
291			fputs(VIEWSTR, sstdout);
292			fprintview(&odev.v, sstdout);
293			fputc('\n', sstdout);
294			fflush(sstdout);
295	gregl	3.1	}
296
297
298			int
299			serv_result() /* get next server result and process it */
300			{
301			static char *buf = NULL;
302			static int bufsiz = 0;
303			MSGHEAD msg;
304			int n;
305			/* read message header */
306			if (fread((char *)&msg, sizeof(MSGHEAD), 1, stdin) != 1)
307			goto readerr;
308			if (msg.nbytes > 0) { /* get the message body */
309			if (msg.nbytes > bufsiz) {
310			if (buf == NULL)
311			buf = (char *)malloc(bufsiz=msg.nbytes);
312			else
313			buf = (char *)realloc(buf, bufsiz=msg.nbytes);
314			if (buf == NULL)
315			error(SYSTEM, "out of memory in serv_result");
316			}
317			if (fread(buf, 1, msg.nbytes, stdin) != msg.nbytes)
318			goto readerr;
319			}
320			switch (msg.type) { /* process results */
321			case DS_BUNDLE:
322			if (msg.nbytes < sizeof(PACKHEAD) \|\|
323			msg.nbytes != packsiz(((PACKHEAD *)buf)->nr))
324			error(INTERNAL, "bad display packet from server");
325			disp_bundle((PACKHEAD *)buf);
326			break;
327			case DS_ADDHOLO:
328			if (msg.nbytes != sizeof(HDGRID))
329			error(INTERNAL, "bad holodeck record from server");
330			add_holo((HDGRID *)buf);
331			break;
332			case DS_STARTIMM:
333			case DS_ENDIMM:
334			imm_mode = msg.type==DS_STARTIMM;
335	gregl	3.7	if (msg.type == DS_ENDIMM)
336			dev_flush(); /* update display NOW */
337	gregl	3.1	/* fall through */
338			case DS_ACKNOW:
339			case DS_SHUTDOWN:
340			if (msg.nbytes) {
341			sprintf(errmsg,
342			"unexpected body with server message %d",
343			msg.type);
344			error(INTERNAL, errmsg);
345			}
346			break;
347			default:
348			error(INTERNAL, "unrecognized result from server process");
349			}
350			return(msg.type); /* return message type */
351			readerr:
352			if (feof(stdin))
353			error(SYSTEM, "server process died");
354			error(SYSTEM, "error reading from server process");
355			}
356
357
358			serv_request(type, nbytes, p) /* send a request to the server process */
359			int type, nbytes;
360			char *p;
361			{
362			MSGHEAD msg;
363			int m;
364			/* get server's attention for big request */
365			if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
366			serv_request(DR_ATTEN, 0, NULL);
367			while ((m = serv_result()) != DS_ACKNOW)
368			if (m == DS_SHUTDOWN) /* the bugger quit on us */
369			quit(0);
370			}
371			msg.type = type; /* write and flush the message */
372			msg.nbytes = nbytes;
373			fwrite((char *)&msg, sizeof(MSGHEAD), 1, stdout);
374			if (nbytes > 0)
375			fwrite(p, 1, nbytes, stdout);
376			if (fflush(stdout) < 0)
377			error(SYSTEM, "write error in serv_request");
378	gregl	3.2	}
379
380
381			eputs(s) /* put error message to stderr */
382			register char *s;
383			{
384			static int midline = 0;
385
386			if (!*s)
387			return;
388			if (!midline++) { /* prepend line with program name */
389			fputs(progname, stderr);
390			fputs(": ", stderr);
391			}
392			fputs(s, stderr);
393			if (s[strlen(s)-1] == '\n') {
394			fflush(stderr);
395			midline = 0;
396			}
397	gregl	3.1	}
398
399
400			quit(code) /* clean up and exit */
401			int code;
402			{
403			if (odev.v.type)
404			dev_close();
405			exit(code);
406			}