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

static 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, 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;
                                                /* verify initialization */
        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);
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");
        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
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);
}


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:	1.19
Committed:	Thu Oct 18 13:33:09 1990 UTC (33 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.18:	+1 -3 lines
Log Message:	changed 1 to X_OK in call to getpath()
#	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	greg	1.16	static int comm_close(), comm_clear(), comm_paintr(), comm_errout(),
32	greg	1.12	comm_getcur(), comm_comout(), comm_comin(), comm_flush();
33	greg	1.1
34	greg	1.12	struct driver comm_driver = {
35	greg	1.1	comm_close, comm_clear, comm_paintr, comm_getcur,
36	greg	1.12	comm_comout, comm_comin, comm_flush
37	greg	1.1	};
38
39			FILE devin, devout;
40
41			int devchild;
42
43
44			struct driver *
45	greg	1.7	comm_init(dname, id) /* set up and execute driver */
46			char dname, id;
47	greg	1.1	{
48			char *devname;
49			int p1[2], p2[2];
50	greg	1.7	char pin[16], pout[16];
51			/* find driver program */
52	greg	1.19	if ((devname = getpath(dname, DEVPATH, X_OK)) == NULL) {
53	greg	1.7	stderr_v(dname);
54	greg	1.1	stderr_v(": not found\n");
55			return(NULL);
56			}
57	greg	1.7	/* open communication pipes */
58	greg	1.1	if (pipe(p1) == -1 \|\| pipe(p2) == -1)
59			goto syserr;
60	greg	1.7	if ((devchild = vfork()) == 0) { /* fork driver process */
61	greg	1.1	close(p1[1]);
62			close(p2[0]);
63	greg	1.7	sprintf(pin, "%d", p1[0]);
64			sprintf(pout, "%d", p2[1]);
65			execl(devname, dname, pin, pout, id, 0);
66			perror(devname);
67	greg	1.1	_exit(127);
68			}
69			if (devchild == -1)
70			goto syserr;
71			close(p1[0]);
72			close(p2[1]);
73			if ((devout = fdopen(p1[1], "w")) == NULL)
74			goto syserr;
75			if ((devin = fdopen(p2[0], "r")) == NULL)
76			goto syserr;
77	greg	1.15	/* verify initialization */
78	greg	1.7	putw(COM_SENDM, devout);
79			fflush(devout);
80			if (getw(devin) != COM_RECVM)
81			return(NULL);
82	greg	1.15	/* get driver parameters */
83	greg	1.17	getstate();
84	greg	1.7	/* set error vectors */
85			cmdvec = comm_comout;
86	greg	1.1	if (wrnvec != NULL)
87			wrnvec = comm_comout;
88			return(&comm_driver);
89			syserr:
90	greg	1.7	perror(dname);
91	greg	1.1	return(NULL);
92			}
93
94
95			static
96			comm_close() /* done with driver */
97			{
98			int pid;
99
100	greg	1.2	cmdvec = NULL; /* reset error vectors */
101	greg	1.1	if (wrnvec != NULL)
102			wrnvec = stderr_v;
103			fclose(devout);
104			fclose(devin);
105			while ((pid = wait(0)) != -1 && pid != devchild)
106			;
107			}
108
109
110			static
111			comm_clear(xres, yres) /* clear screen */
112			int xres, yres;
113			{
114			putc(COM_CLEAR, devout);
115	greg	1.8	putw(xres, devout);
116			putw(yres, devout);
117	greg	1.1	fflush(devout);
118			}
119
120
121			static
122			comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
123			COLOR col;
124			int xmin, ymin, xmax, ymax;
125			{
126			putc(COM_PAINTR, devout);
127	greg	1.10	fwrite((char *)col, sizeof(COLOR), 1, devout);
128	greg	1.8	putw(xmin, devout);
129			putw(ymin, devout);
130			putw(xmax, devout);
131			putw(ymax, devout);
132	greg	1.12	}
133
134
135			static
136			comm_flush() /* flush output to driver */
137			{
138			putc(COM_FLUSH, devout);
139			fflush(devout);
140	greg	1.13	if (getc(devin) != COM_FLUSH)
141			reply_error("flush");
142	greg	1.17	getstate();
143	greg	1.1	}
144
145
146			static int
147			comm_getcur(xp, yp) /* get and return cursor position */
148			int xp, yp;
149			{
150			int c;
151
152			putc(COM_GETCUR, devout);
153			fflush(devout);
154			if (getc(devin) != COM_GETCUR)
155			reply_error("getcur");
156			c = getc(devin);
157	greg	1.8	*xp = getw(devin);
158			*yp = getw(devin);
159	greg	1.1	return(c);
160			}
161
162
163			static
164			comm_comout(str) /* print string to command line */
165			char *str;
166			{
167			putc(COM_COMOUT, devout);
168			myputs(str, devout);
169	greg	1.18	if (str[strlen(str)-1] == '\n')
170			fflush(devout);
171	greg	1.1	}
172
173
174			static
175	greg	1.11	comm_comin(buf, prompt) /* read string from command line */
176	greg	1.1	char *buf;
177	greg	1.11	char *prompt;
178	greg	1.1	{
179			putc(COM_COMIN, devout);
180	greg	1.11	if (prompt == NULL)
181			putc(0, devout);
182			else {
183			putc(1, devout);
184			myputs(prompt, devout);
185			}
186	greg	1.1	fflush(devout);
187			if (getc(devin) != COM_COMIN)
188			reply_error("comin");
189			mygets(buf, devin);
190	greg	1.17	getstate();
191	greg	1.1	}
192
193
194			static
195			comm_errout(str) /* display an error message */
196			char *str;
197			{
198			comm_comout(str);
199			stderr_v(str); /* send to standard error also */
200			}
201
202
203			static
204			mygets(s, fp) /* get string from file (with nul) */
205			register char *s;
206			register FILE *fp;
207			{
208			register int c;
209
210			while ((c = getc(fp)) != EOF)
211			if ((*s++ = c) == '\0')
212			return;
213			*s = '\0';
214			}
215
216
217			static
218			myputs(s, fp) /* put string to file (with nul) */
219			register char *s;
220			register FILE *fp;
221			{
222			do
223			putc(*s, fp);
224			while (*s++);
225			}
226
227
228			static
229			reply_error(routine) /* what should we do here? */
230			char *routine;
231			{
232			stderr_v(routine);
233			stderr_v(": driver reply error\n");
234			quit(1);
235	greg	1.17	}
236
237
238			static
239			getstate() /* get driver state variables */
240			{
241			fread((char *)&comm_driver.pixaspect,
242			sizeof(comm_driver.pixaspect), 1, devin);
243			comm_driver.xsiz = getw(devin);
244			comm_driver.ysiz = getw(devin);
245			comm_driver.inpready = getw(devin);
246	greg	1.1	}