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 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 & get resolution */
        putw(COM_SENDM, devout);
        fflush(devout);
        if (getw(devin) != COM_RECVM)
                return(NULL);
        fread((char *)&comm_driver.pixaspect,
                        sizeof(comm_driver.pixaspect), 1, devin);
        comm_driver.xsiz = getw(devin);
        comm_driver.ysiz = getw(devin);
                                                /* 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");
        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);
        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);
        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:	1.13
Committed:	Thu Feb 22 12:45:27 1990 UTC (34 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.12:	+4 -14 lines
Log Message:	Changed devcomm so that flush() is used to check for input
#	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			#ifndef BSD
24			#define vfork fork
25			#endif
26
27			extern char getpath(), getenv();
28
29			int onsigio();
30
31			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			if ((devname = getpath(dname, DEVPATH, 1)) == NULL) {
53			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	1.7	/* verify & get resolution */
78			putw(COM_SENDM, devout);
79			fflush(devout);
80			if (getw(devin) != COM_RECVM)
81			return(NULL);
82	greg	1.10	fread((char *)&comm_driver.pixaspect,
83			sizeof(comm_driver.pixaspect), 1, devin);
84	greg	1.7	comm_driver.xsiz = getw(devin);
85			comm_driver.ysiz = getw(devin);
86			/* set error vectors */
87			cmdvec = comm_comout;
88	greg	1.1	if (wrnvec != NULL)
89			wrnvec = comm_comout;
90			return(&comm_driver);
91			syserr:
92	greg	1.7	perror(dname);
93	greg	1.1	return(NULL);
94			}
95
96
97			static
98			comm_close() /* done with driver */
99			{
100			int pid;
101
102	greg	1.2	cmdvec = NULL; /* reset error vectors */
103	greg	1.1	if (wrnvec != NULL)
104			wrnvec = stderr_v;
105			fclose(devout);
106			fclose(devin);
107			while ((pid = wait(0)) != -1 && pid != devchild)
108			;
109			}
110
111
112			static
113			comm_clear(xres, yres) /* clear screen */
114			int xres, yres;
115			{
116			putc(COM_CLEAR, devout);
117	greg	1.8	putw(xres, devout);
118			putw(yres, devout);
119	greg	1.1	fflush(devout);
120			}
121
122
123			static
124			comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
125			COLOR col;
126			int xmin, ymin, xmax, ymax;
127			{
128			putc(COM_PAINTR, devout);
129	greg	1.10	fwrite((char *)col, sizeof(COLOR), 1, devout);
130	greg	1.8	putw(xmin, devout);
131			putw(ymin, devout);
132			putw(xmax, devout);
133			putw(ymax, devout);
134	greg	1.12	}
135
136
137			static
138			comm_flush() /* flush output to driver */
139			{
140			putc(COM_FLUSH, devout);
141			fflush(devout);
142	greg	1.13	if (getc(devin) != COM_FLUSH)
143			reply_error("flush");
144			comm_driver.inpready = getw(devin);
145	greg	1.1	}
146
147
148			static int
149			comm_getcur(xp, yp) /* get and return cursor position */
150			int xp, yp;
151			{
152			int c;
153
154			putc(COM_GETCUR, devout);
155			fflush(devout);
156			if (getc(devin) != COM_GETCUR)
157			reply_error("getcur");
158			c = getc(devin);
159	greg	1.8	*xp = getw(devin);
160			*yp = getw(devin);
161	greg	1.1	return(c);
162			}
163
164
165			static
166			comm_comout(str) /* print string to command line */
167			char *str;
168			{
169			putc(COM_COMOUT, devout);
170			myputs(str, devout);
171	greg	1.3	fflush(devout);
172	greg	1.1	}
173
174
175			static
176	greg	1.11	comm_comin(buf, prompt) /* read string from command line */
177	greg	1.1	char *buf;
178	greg	1.11	char *prompt;
179	greg	1.1	{
180			putc(COM_COMIN, devout);
181	greg	1.11	if (prompt == NULL)
182			putc(0, devout);
183			else {
184			putc(1, devout);
185			myputs(prompt, devout);
186			}
187	greg	1.1	fflush(devout);
188			if (getc(devin) != COM_COMIN)
189			reply_error("comin");
190			mygets(buf, devin);
191	greg	1.13	comm_driver.inpready = getw(devin);
192	greg	1.1	}
193
194
195			static
196			comm_errout(str) /* display an error message */
197			char *str;
198			{
199			comm_comout(str);
200			stderr_v(str); /* send to standard error also */
201			}
202
203
204			static
205			mygets(s, fp) /* get string from file (with nul) */
206			register char *s;
207			register FILE *fp;
208			{
209			register int c;
210
211			while ((c = getc(fp)) != EOF)
212			if ((*s++ = c) == '\0')
213			return;
214			*s = '\0';
215			}
216
217
218			static
219			myputs(s, fp) /* put string to file (with nul) */
220			register char *s;
221			register FILE *fp;
222			{
223			do
224			putc(*s, fp);
225			while (*s++);
226			}
227
228
229			static
230			reply_error(routine) /* what should we do here? */
231			char *routine;
232			{
233			stderr_v(routine);
234			stderr_v(": driver reply error\n");
235			quit(1);
236			}