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 |
#include "standard.h" |
14 |
|
15 |
#include "color.h" |
16 |
|
17 |
#include "driver.h" |
18 |
|
19 |
#include "vfork.h" |
20 |
|
21 |
#ifndef DEVPATH |
22 |
#define DEVPATH getenv("PATH") /* device search path */ |
23 |
#endif |
24 |
|
25 |
static int comm_close(), comm_clear(), comm_paintr(), |
26 |
comm_getcur(), comm_comout(), comm_comin(), comm_flush(); |
27 |
|
28 |
struct driver comm_driver = { |
29 |
comm_close, comm_clear, comm_paintr, comm_getcur, |
30 |
comm_comout, comm_comin, comm_flush |
31 |
}; |
32 |
|
33 |
static int mygets(), myputs(), reply_error(), getstate(); |
34 |
|
35 |
FILE *devin, *devout; |
36 |
|
37 |
int devchild; |
38 |
|
39 |
|
40 |
static struct driver * |
41 |
final_connect() /* verify and initialize connection */ |
42 |
{ |
43 |
putw(COM_SENDM, devout); |
44 |
fflush(devout); |
45 |
if (getw(devin) != COM_RECVM) |
46 |
return(NULL); |
47 |
/* get driver parameters */ |
48 |
getstate(); |
49 |
/* set error vectors */ |
50 |
cmdvec = comm_comout; |
51 |
if (wrnvec != NULL) |
52 |
wrnvec = comm_comout; |
53 |
return(&comm_driver); |
54 |
} |
55 |
|
56 |
|
57 |
struct driver * |
58 |
slave_init(dname, id) /* run rview in slave mode */ |
59 |
char *dname, *id; |
60 |
{ |
61 |
devchild = -1; /* we're the slave here */ |
62 |
devout = stdout; /* use standard input */ |
63 |
devin = stdin; /* and standard output */ |
64 |
return(final_connect()); /* verify initialization */ |
65 |
} |
66 |
|
67 |
|
68 |
struct driver * |
69 |
comm_init(dname, id) /* set up and execute driver */ |
70 |
char *dname, *id; |
71 |
{ |
72 |
char *devname; |
73 |
int p1[2], p2[2]; |
74 |
char pin[16], pout[16]; |
75 |
/* find driver program */ |
76 |
if ((devname = getpath(dname, DEVPATH, X_OK)) == NULL) { |
77 |
stderr_v(dname); |
78 |
stderr_v(": not found\n"); |
79 |
return(NULL); |
80 |
} |
81 |
/* open communication pipes */ |
82 |
if (pipe(p1) == -1 || pipe(p2) == -1) |
83 |
goto syserr; |
84 |
if ((devchild = vfork()) == 0) { /* fork driver process */ |
85 |
close(p1[1]); |
86 |
close(p2[0]); |
87 |
sprintf(pin, "%d", p1[0]); |
88 |
sprintf(pout, "%d", p2[1]); |
89 |
execl(devname, dname, pin, pout, id, 0); |
90 |
perror(devname); |
91 |
_exit(127); |
92 |
} |
93 |
if (devchild == -1) |
94 |
goto syserr; |
95 |
close(p1[0]); |
96 |
close(p2[1]); |
97 |
if ((devout = fdopen(p1[1], "w")) == NULL) |
98 |
goto syserr; |
99 |
if ((devin = fdopen(p2[0], "r")) == NULL) |
100 |
goto syserr; |
101 |
return(final_connect()); /* verify initialization */ |
102 |
syserr: |
103 |
perror(dname); |
104 |
return(NULL); |
105 |
} |
106 |
|
107 |
|
108 |
static |
109 |
comm_close() /* done with driver */ |
110 |
{ |
111 |
int pid; |
112 |
|
113 |
cmdvec = NULL; /* reset error vectors */ |
114 |
if (wrnvec != NULL) |
115 |
wrnvec = stderr_v; |
116 |
fclose(devout); |
117 |
fclose(devin); |
118 |
if (devchild < 0) |
119 |
return; |
120 |
while ((pid = wait(0)) != -1 && pid != devchild) |
121 |
; |
122 |
} |
123 |
|
124 |
|
125 |
static |
126 |
comm_clear(xres, yres) /* clear screen */ |
127 |
int xres, yres; |
128 |
{ |
129 |
putc(COM_CLEAR, devout); |
130 |
putw(xres, devout); |
131 |
putw(yres, devout); |
132 |
fflush(devout); |
133 |
} |
134 |
|
135 |
|
136 |
static |
137 |
comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */ |
138 |
COLOR col; |
139 |
int xmin, ymin, xmax, ymax; |
140 |
{ |
141 |
putc(COM_PAINTR, devout); |
142 |
fwrite((char *)col, sizeof(COLOR), 1, devout); |
143 |
putw(xmin, devout); |
144 |
putw(ymin, devout); |
145 |
putw(xmax, devout); |
146 |
putw(ymax, devout); |
147 |
} |
148 |
|
149 |
|
150 |
static |
151 |
comm_flush() /* flush output to driver */ |
152 |
{ |
153 |
putc(COM_FLUSH, devout); |
154 |
fflush(devout); |
155 |
if (getc(devin) != COM_FLUSH) |
156 |
reply_error("flush"); |
157 |
getstate(); |
158 |
} |
159 |
|
160 |
|
161 |
static int |
162 |
comm_getcur(xp, yp) /* get and return cursor position */ |
163 |
int *xp, *yp; |
164 |
{ |
165 |
int c; |
166 |
|
167 |
putc(COM_GETCUR, devout); |
168 |
fflush(devout); |
169 |
if (getc(devin) != COM_GETCUR) |
170 |
reply_error("getcur"); |
171 |
c = getc(devin); |
172 |
*xp = getw(devin); |
173 |
*yp = getw(devin); |
174 |
return(c); |
175 |
} |
176 |
|
177 |
|
178 |
static |
179 |
comm_comout(str) /* print string to command line */ |
180 |
char *str; |
181 |
{ |
182 |
putc(COM_COMOUT, devout); |
183 |
myputs(str, devout); |
184 |
if (str[strlen(str)-1] == '\n') |
185 |
fflush(devout); |
186 |
} |
187 |
|
188 |
|
189 |
static |
190 |
comm_comin(buf, prompt) /* read string from command line */ |
191 |
char *buf; |
192 |
char *prompt; |
193 |
{ |
194 |
putc(COM_COMIN, devout); |
195 |
if (prompt == NULL) |
196 |
putc(0, devout); |
197 |
else { |
198 |
putc(1, devout); |
199 |
myputs(prompt, devout); |
200 |
} |
201 |
fflush(devout); |
202 |
if (getc(devin) != COM_COMIN) |
203 |
reply_error("comin"); |
204 |
mygets(buf, devin); |
205 |
getstate(); |
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 |
} |
242 |
|
243 |
|
244 |
static |
245 |
getstate() /* get driver state variables */ |
246 |
{ |
247 |
fread((char *)&comm_driver.pixaspect, |
248 |
sizeof(comm_driver.pixaspect), 1, devin); |
249 |
comm_driver.xsiz = getw(devin); |
250 |
comm_driver.ysiz = getw(devin); |
251 |
comm_driver.inpready = getw(devin); |
252 |
} |