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"

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

#ifndef DELAY
#define DELAY           20              /* seconds to wait for response */
#endif

#ifndef BSD
#define vfork           fork
#endif

extern char     *getpath(), *getenv();

int     onsigio();

int     comm_close(), comm_clear(), comm_paintr(), comm_errout(),
                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;


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, 1)) == 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;
                                                /* verify initialization */
        putw(COM_SENDM, devout);
        fflush(devout);
        if (getw(devin) != COM_RECVM)
                return(NULL);
                                                /* get driver parameters */
        comm_flush();
                                                /* set error vectors */
        cmdvec = comm_comout;
        if (wrnvec != NULL)
                wrnvec = comm_comout;
        return(&comm_driver);
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);
        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");
        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);
}


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);
}


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);
        comm_driver.inpready = getw(devin);
}


static
comm_errout(str)                        /* display an error message */
char    *str;
{
        comm_comout(str);
        stderr_v(str);                  /* send to standard error also */
}


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);
}
Revision:	1.15
Committed:	Tue Mar 6 17:44:37 1990 UTC (34 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.14:	+11 -5 lines
Log Message:	made sundev work with resizing
#	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			#ifndef DEVPATH
20			#define DEVPATH getenv("PATH") /* device search path */
21			#endif
22
23	greg	1.15	#ifndef DELAY
24			#define DELAY 20 /* seconds to wait for response */
25			#endif
26
27	greg	1.1	#ifndef BSD
28			#define vfork fork
29			#endif
30
31			extern char getpath(), getenv();
32
33			int onsigio();
34
35			int comm_close(), comm_clear(), comm_paintr(), comm_errout(),
36	greg	1.12	comm_getcur(), comm_comout(), comm_comin(), comm_flush();
37	greg	1.1
38	greg	1.12	struct driver comm_driver = {
39	greg	1.1	comm_close, comm_clear, comm_paintr, comm_getcur,
40	greg	1.12	comm_comout, comm_comin, comm_flush
41	greg	1.1	};
42
43			FILE devin, devout;
44
45			int devchild;
46
47
48			struct driver *
49	greg	1.7	comm_init(dname, id) /* set up and execute driver */
50			char dname, id;
51	greg	1.1	{
52			char *devname;
53			int p1[2], p2[2];
54	greg	1.7	char pin[16], pout[16];
55			/* find driver program */
56			if ((devname = getpath(dname, DEVPATH, 1)) == NULL) {
57			stderr_v(dname);
58	greg	1.1	stderr_v(": not found\n");
59			return(NULL);
60			}
61	greg	1.7	/* open communication pipes */
62	greg	1.1	if (pipe(p1) == -1 \|\| pipe(p2) == -1)
63			goto syserr;
64	greg	1.7	if ((devchild = vfork()) == 0) { /* fork driver process */
65	greg	1.1	close(p1[1]);
66			close(p2[0]);
67	greg	1.7	sprintf(pin, "%d", p1[0]);
68			sprintf(pout, "%d", p2[1]);
69			execl(devname, dname, pin, pout, id, 0);
70			perror(devname);
71	greg	1.1	_exit(127);
72			}
73			if (devchild == -1)
74			goto syserr;
75			close(p1[0]);
76			close(p2[1]);
77			if ((devout = fdopen(p1[1], "w")) == NULL)
78			goto syserr;
79			if ((devin = fdopen(p2[0], "r")) == NULL)
80			goto syserr;
81	greg	1.15	/* verify initialization */
82	greg	1.7	putw(COM_SENDM, devout);
83			fflush(devout);
84			if (getw(devin) != COM_RECVM)
85			return(NULL);
86	greg	1.15	/* get driver parameters */
87			comm_flush();
88	greg	1.7	/* set error vectors */
89			cmdvec = comm_comout;
90	greg	1.1	if (wrnvec != NULL)
91			wrnvec = comm_comout;
92			return(&comm_driver);
93			syserr:
94	greg	1.7	perror(dname);
95	greg	1.1	return(NULL);
96			}
97
98
99			static
100			comm_close() /* done with driver */
101			{
102			int pid;
103
104	greg	1.2	cmdvec = NULL; /* reset error vectors */
105	greg	1.1	if (wrnvec != NULL)
106			wrnvec = stderr_v;
107			fclose(devout);
108			fclose(devin);
109			while ((pid = wait(0)) != -1 && pid != devchild)
110			;
111			}
112
113
114			static
115			comm_clear(xres, yres) /* clear screen */
116			int xres, yres;
117			{
118			putc(COM_CLEAR, devout);
119	greg	1.8	putw(xres, devout);
120			putw(yres, devout);
121	greg	1.1	fflush(devout);
122			}
123
124
125			static
126			comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
127			COLOR col;
128			int xmin, ymin, xmax, ymax;
129			{
130			putc(COM_PAINTR, devout);
131	greg	1.10	fwrite((char *)col, sizeof(COLOR), 1, devout);
132	greg	1.8	putw(xmin, devout);
133			putw(ymin, devout);
134			putw(xmax, devout);
135			putw(ymax, devout);
136	greg	1.12	}
137
138
139			static
140			comm_flush() /* flush output to driver */
141			{
142			putc(COM_FLUSH, devout);
143			fflush(devout);
144	greg	1.13	if (getc(devin) != COM_FLUSH)
145			reply_error("flush");
146	greg	1.15	fread((char *)&comm_driver.pixaspect,
147			sizeof(comm_driver.pixaspect), 1, devin);
148			comm_driver.xsiz = getw(devin);
149			comm_driver.ysiz = getw(devin);
150	greg	1.13	comm_driver.inpready = getw(devin);
151	greg	1.1	}
152
153
154			static int
155			comm_getcur(xp, yp) /* get and return cursor position */
156			int xp, yp;
157			{
158			int c;
159
160			putc(COM_GETCUR, devout);
161			fflush(devout);
162			if (getc(devin) != COM_GETCUR)
163			reply_error("getcur");
164			c = getc(devin);
165	greg	1.8	*xp = getw(devin);
166			*yp = getw(devin);
167	greg	1.1	return(c);
168			}
169
170
171			static
172			comm_comout(str) /* print string to command line */
173			char *str;
174			{
175			putc(COM_COMOUT, devout);
176			myputs(str, devout);
177			}
178
179
180			static
181	greg	1.11	comm_comin(buf, prompt) /* read string from command line */
182	greg	1.1	char *buf;
183	greg	1.11	char *prompt;
184	greg	1.1	{
185			putc(COM_COMIN, devout);
186	greg	1.11	if (prompt == NULL)
187			putc(0, devout);
188			else {
189			putc(1, devout);
190			myputs(prompt, devout);
191			}
192	greg	1.1	fflush(devout);
193			if (getc(devin) != COM_COMIN)
194			reply_error("comin");
195			mygets(buf, devin);
196	greg	1.13	comm_driver.inpready = getw(devin);
197	greg	1.1	}
198
199
200			static
201			comm_errout(str) /* display an error message */
202			char *str;
203			{
204			comm_comout(str);
205			stderr_v(str); /* send to standard error also */
206			}
207
208
209			static
210			mygets(s, fp) /* get string from file (with nul) */
211			register char *s;
212			register FILE *fp;
213			{
214			register int c;
215
216			while ((c = getc(fp)) != EOF)
217			if ((*s++ = c) == '\0')
218			return;
219			*s = '\0';
220			}
221
222
223			static
224			myputs(s, fp) /* put string to file (with nul) */
225			register char *s;
226			register FILE *fp;
227			{
228			do
229			putc(*s, fp);
230			while (*s++);
231			}
232
233
234			static
235			reply_error(routine) /* what should we do here? */
236			char *routine;
237			{
238			stderr_v(routine);
239			stderr_v(": driver reply error\n");
240			quit(1);
241			}