src/rt/devcomm.c

/* Copyright (c) 1988 Regents of the University of California */

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

/*
 *  devcomm.c - communication routines for separate drivers.
 *
 *      10/5/88
 */

#include "standard.h"

#include "color.h"

#include "driver.h"

#include "vfork.h"

#ifndef DEVPATH
#define DEVPATH         getenv("PATH")  /* device search path */
#endif

static int      comm_close(), comm_clear(), comm_paintr(),
                comm_getcur(), comm_comout(), comm_comin(), comm_flush();

struct driver   comm_driver = {
        comm_close, comm_clear, comm_paintr, comm_getcur,
        comm_comout, comm_comin, comm_flush
};

FILE    *devin, *devout;

int     devchild;


static struct driver *
final_connect()                         /* verify and initialize connection */
{
        putw(COM_SENDM, devout);
        fflush(devout);
        if (getw(devin) != COM_RECVM)
                return(NULL);
                                                /* get driver parameters */
        getstate();
                                                /* set error vectors */
        cmdvec = comm_comout;
        if (wrnvec != NULL)
                wrnvec = comm_comout;
        return(&comm_driver);
}


struct driver *
slave_init(dname, id)                   /* run rview in slave mode */
char    *dname, *id;
{
        devchild = -1;                          /* we're the slave here */
        devout = stdout;                        /* use standard input */
        devin = stdin;                          /* and standard output */
        return(final_connect());                /* verify initialization */
}


struct driver *
comm_init(dname, id)                    /* set up and execute driver */
char    *dname, *id;
{
        char    *devname;
        int     p1[2], p2[2];
        char    pin[16], pout[16];
                                                /* find driver program */
        if ((devname = getpath(dname, DEVPATH, X_OK)) == NULL) {
                stderr_v(dname);
                stderr_v(": not found\n");
                return(NULL);
        }
                                                /* open communication pipes */
        if (pipe(p1) == -1 || pipe(p2) == -1)
                goto syserr;
        if ((devchild = vfork()) == 0) {        /* fork driver process */
                close(p1[1]);
                close(p2[0]);
                sprintf(pin, "%d", p1[0]);
                sprintf(pout, "%d", p2[1]);
                execl(devname, dname, pin, pout, id, 0);
                perror(devname);
                _exit(127);
        }
        if (devchild == -1)
                goto syserr;
        close(p1[0]);
        close(p2[1]);
        if ((devout = fdopen(p1[1], "w")) == NULL)
                goto syserr;
        if ((devin = fdopen(p2[0], "r")) == NULL)
                goto syserr;
        return(final_connect());                /* verify initialization */
syserr:
        perror(dname);
        return(NULL);
}


static
comm_close()                    /* done with driver */
{
        int     pid;

        cmdvec = NULL;                          /* reset error vectors */
        if (wrnvec != NULL)
                wrnvec = stderr_v;
        fclose(devout);
        fclose(devin);
        if (devchild < 0)
                return;
        while ((pid = wait(0)) != -1 && pid != devchild)
                ;
}


static
comm_clear(xres, yres)                          /* clear screen */
int     xres, yres;
{
        putc(COM_CLEAR, devout);
        putw(xres, devout);
        putw(yres, devout);
        fflush(devout);
}


static
comm_paintr(col, xmin, ymin, xmax, ymax)        /* paint a rectangle */
COLOR   col;
int     xmin, ymin, xmax, ymax;
{
        putc(COM_PAINTR, devout);
        fwrite((char *)col, sizeof(COLOR), 1, devout);
        putw(xmin, devout);
        putw(ymin, devout);
        putw(xmax, devout);
        putw(ymax, devout);
}


static
comm_flush()                            /* flush output to driver */
{
        putc(COM_FLUSH, devout);
        fflush(devout);
        if (getc(devin) != COM_FLUSH)
                reply_error("flush");
        getstate();
}


static int
comm_getcur(xp, yp)                     /* get and return cursor position */
int     *xp, *yp;
{
        int     c;

        putc(COM_GETCUR, devout);
        fflush(devout);
        if (getc(devin) != COM_GETCUR)
                reply_error("getcur");
        c = getc(devin);
        *xp = getw(devin);
        *yp = getw(devin);
        return(c);
}


static
comm_comout(str)                        /* print string to command line */
char    *str;
{
        putc(COM_COMOUT, devout);
        myputs(str, devout);
        if (str[strlen(str)-1] == '\n')
                fflush(devout);
}


static
comm_comin(buf, prompt)                 /* read string from command line */
char    *buf;
char    *prompt;
{
        putc(COM_COMIN, devout);
        if (prompt == NULL)
                putc(0, devout);
        else {
                putc(1, devout);
                myputs(prompt, devout);
        }
        fflush(devout);
        if (getc(devin) != COM_COMIN)
                reply_error("comin");
        mygets(buf, devin);
        getstate();
}


static
mygets(s, fp)                           /* get string from file (with nul) */
register char   *s;
register FILE   *fp;
{
        register int    c;

        while ((c = getc(fp)) != EOF)
                if ((*s++ = c) == '\0')
                        return;
        *s = '\0';
}


static
myputs(s, fp)                           /* put string to file (with nul) */
register char   *s;
register FILE   *fp;
{
        do
                putc(*s, fp);
        while (*s++);
}


static
reply_error(routine)                    /* what should we do here? */
char    *routine;
{
        stderr_v(routine);
        stderr_v(": driver reply error\n");
        quit(1);
}


static
getstate()                              /* get driver state variables */
{
        fread((char *)&comm_driver.pixaspect,
                        sizeof(comm_driver.pixaspect), 1, devin);
        comm_driver.xsiz = getw(devin);
        comm_driver.ysiz = getw(devin);
        comm_driver.inpready = getw(devin);
}
Revision:	2.3
Committed:	Mon Apr 5 15:16:47 1993 UTC (31 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.2:	+32 -26 lines
Log Message:	added slave_init() for slave mode of rview
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1988 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* devcomm.c - communication routines for separate drivers.
9			*
10			* 10/5/88
11			*/
12
13	greg	1.10	#include "standard.h"
14	greg	1.1
15			#include "color.h"
16
17			#include "driver.h"
18
19	greg	2.2	#include "vfork.h"
20
21	greg	1.1	#ifndef DEVPATH
22			#define DEVPATH getenv("PATH") /* device search path */
23			#endif
24
25	greg	2.3	static int comm_close(), comm_clear(), comm_paintr(),
26	greg	1.12	comm_getcur(), comm_comout(), comm_comin(), comm_flush();
27	greg	1.1
28	greg	1.12	struct driver comm_driver = {
29	greg	1.1	comm_close, comm_clear, comm_paintr, comm_getcur,
30	greg	1.12	comm_comout, comm_comin, comm_flush
31	greg	1.1	};
32
33			FILE devin, devout;
34
35			int devchild;
36
37
38	greg	2.3	static struct driver *
39			final_connect() /* verify and initialize connection */
40			{
41			putw(COM_SENDM, devout);
42			fflush(devout);
43			if (getw(devin) != COM_RECVM)
44			return(NULL);
45			/* get driver parameters */
46			getstate();
47			/* set error vectors */
48			cmdvec = comm_comout;
49			if (wrnvec != NULL)
50			wrnvec = comm_comout;
51			return(&comm_driver);
52			}
53
54
55	greg	1.1	struct driver *
56	greg	2.3	slave_init(dname, id) /* run rview in slave mode */
57			char dname, id;
58			{
59			devchild = -1; /* we're the slave here */
60			devout = stdout; /* use standard input */
61			devin = stdin; /* and standard output */
62			return(final_connect()); /* verify initialization */
63			}
64
65
66			struct driver *
67	greg	1.7	comm_init(dname, id) /* set up and execute driver */
68			char dname, id;
69	greg	1.1	{
70			char *devname;
71			int p1[2], p2[2];
72	greg	1.7	char pin[16], pout[16];
73			/* find driver program */
74	greg	1.19	if ((devname = getpath(dname, DEVPATH, X_OK)) == NULL) {
75	greg	1.7	stderr_v(dname);
76	greg	1.1	stderr_v(": not found\n");
77			return(NULL);
78			}
79	greg	1.7	/* open communication pipes */
80	greg	1.1	if (pipe(p1) == -1 \|\| pipe(p2) == -1)
81			goto syserr;
82	greg	1.7	if ((devchild = vfork()) == 0) { /* fork driver process */
83	greg	1.1	close(p1[1]);
84			close(p2[0]);
85	greg	1.7	sprintf(pin, "%d", p1[0]);
86			sprintf(pout, "%d", p2[1]);
87			execl(devname, dname, pin, pout, id, 0);
88			perror(devname);
89	greg	1.1	_exit(127);
90			}
91			if (devchild == -1)
92			goto syserr;
93			close(p1[0]);
94			close(p2[1]);
95			if ((devout = fdopen(p1[1], "w")) == NULL)
96			goto syserr;
97			if ((devin = fdopen(p2[0], "r")) == NULL)
98			goto syserr;
99	greg	2.3	return(final_connect()); /* verify initialization */
100	greg	1.1	syserr:
101	greg	1.7	perror(dname);
102	greg	1.1	return(NULL);
103			}
104
105
106			static
107			comm_close() /* done with driver */
108			{
109			int pid;
110
111	greg	1.2	cmdvec = NULL; /* reset error vectors */
112	greg	1.1	if (wrnvec != NULL)
113			wrnvec = stderr_v;
114			fclose(devout);
115			fclose(devin);
116	greg	2.3	if (devchild < 0)
117			return;
118	greg	1.1	while ((pid = wait(0)) != -1 && pid != devchild)
119			;
120			}
121
122
123			static
124			comm_clear(xres, yres) /* clear screen */
125			int xres, yres;
126			{
127			putc(COM_CLEAR, devout);
128	greg	1.8	putw(xres, devout);
129			putw(yres, devout);
130	greg	1.1	fflush(devout);
131			}
132
133
134			static
135			comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
136			COLOR col;
137			int xmin, ymin, xmax, ymax;
138			{
139			putc(COM_PAINTR, devout);
140	greg	1.10	fwrite((char *)col, sizeof(COLOR), 1, devout);
141	greg	1.8	putw(xmin, devout);
142			putw(ymin, devout);
143			putw(xmax, devout);
144			putw(ymax, devout);
145	greg	1.12	}
146
147
148			static
149			comm_flush() /* flush output to driver */
150			{
151			putc(COM_FLUSH, devout);
152			fflush(devout);
153	greg	1.13	if (getc(devin) != COM_FLUSH)
154			reply_error("flush");
155	greg	1.17	getstate();
156	greg	1.1	}
157
158
159			static int
160			comm_getcur(xp, yp) /* get and return cursor position */
161			int xp, yp;
162			{
163			int c;
164
165			putc(COM_GETCUR, devout);
166			fflush(devout);
167			if (getc(devin) != COM_GETCUR)
168			reply_error("getcur");
169			c = getc(devin);
170	greg	1.8	*xp = getw(devin);
171			*yp = getw(devin);
172	greg	1.1	return(c);
173			}
174
175
176			static
177			comm_comout(str) /* print string to command line */
178			char *str;
179			{
180			putc(COM_COMOUT, devout);
181			myputs(str, devout);
182	greg	1.18	if (str[strlen(str)-1] == '\n')
183			fflush(devout);
184	greg	1.1	}
185
186
187			static
188	greg	1.11	comm_comin(buf, prompt) /* read string from command line */
189	greg	1.1	char *buf;
190	greg	1.11	char *prompt;
191	greg	1.1	{
192			putc(COM_COMIN, devout);
193	greg	1.11	if (prompt == NULL)
194			putc(0, devout);
195			else {
196			putc(1, devout);
197			myputs(prompt, devout);
198			}
199	greg	1.1	fflush(devout);
200			if (getc(devin) != COM_COMIN)
201			reply_error("comin");
202			mygets(buf, devin);
203	greg	1.17	getstate();
204	greg	1.1	}
205
206
207			static
208			mygets(s, fp) /* get string from file (with nul) */
209			register char *s;
210			register FILE *fp;
211			{
212			register int c;
213
214			while ((c = getc(fp)) != EOF)
215			if ((*s++ = c) == '\0')
216			return;
217			*s = '\0';
218			}
219
220
221			static
222			myputs(s, fp) /* put string to file (with nul) */
223			register char *s;
224			register FILE *fp;
225			{
226			do
227			putc(*s, fp);
228			while (*s++);
229			}
230
231
232			static
233			reply_error(routine) /* what should we do here? */
234			char *routine;
235			{
236			stderr_v(routine);
237			stderr_v(": driver reply error\n");
238			quit(1);
239	greg	1.17	}
240
241
242			static
243			getstate() /* get driver state variables */
244			{
245			fread((char *)&comm_driver.pixaspect,
246			sizeof(comm_driver.pixaspect), 1, devin);
247			comm_driver.xsiz = getw(devin);
248			comm_driver.ysiz = getw(devin);
249			comm_driver.inpready = getw(devin);
250	greg	1.1	}