1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: devcomm.c,v 2.11 2003/11/11 16:24:06 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* devcomm.c - communication routines for separate drivers. |
6 |
* |
7 |
* External symbols declared in driver.h |
8 |
*/ |
9 |
|
10 |
#include "copyright.h" |
11 |
|
12 |
#include <sys/types.h> |
13 |
#include <sys/wait.h> /* XXX platform specific */ |
14 |
|
15 |
#include "platform.h" |
16 |
#include "standard.h" |
17 |
#include "driver.h" |
18 |
|
19 |
#ifndef DEVPATH |
20 |
#define DEVPATH getenv("PATH") /* device search path */ |
21 |
#endif |
22 |
|
23 |
FILE *devin, *devout; |
24 |
int devchild; |
25 |
|
26 |
static struct driver * final_connect(void); |
27 |
static void mygets(char *s, FILE *fp); |
28 |
static void myputs(char *s, FILE *fp); |
29 |
static void reply_error(char *routine); |
30 |
static void getstate(void); |
31 |
|
32 |
static dr_closef_t comm_close; |
33 |
static dr_clearf_t comm_clear; |
34 |
static dr_paintrf_t comm_paintr; |
35 |
static dr_getcurf_t comm_getcur; |
36 |
static dr_comoutf_t comm_comout; |
37 |
static dr_cominf_t comm_comin; |
38 |
static dr_flushf_t comm_flush; |
39 |
|
40 |
struct driver comm_driver = { |
41 |
comm_close, comm_clear, comm_paintr, comm_getcur, |
42 |
comm_comout, comm_comin, comm_flush |
43 |
}; |
44 |
|
45 |
|
46 |
static struct driver * |
47 |
final_connect(void) /* verify and initialize connection */ |
48 |
{ |
49 |
putw(COM_SENDM, devout); |
50 |
fflush(devout); |
51 |
if (getw(devin) != COM_RECVM) |
52 |
return(NULL); |
53 |
/* get driver parameters */ |
54 |
getstate(); |
55 |
/* set error vectors */ |
56 |
erract[COMMAND].pf = comm_comout; |
57 |
if (erract[WARNING].pf != NULL) |
58 |
erract[WARNING].pf = comm_comout; |
59 |
return(&comm_driver); |
60 |
} |
61 |
|
62 |
|
63 |
extern struct driver * |
64 |
slave_init( /* run rview in slave mode */ |
65 |
char *dname, |
66 |
char *id |
67 |
) |
68 |
{ |
69 |
devchild = -1; /* we're the slave here */ |
70 |
devout = stdout; /* use standard input */ |
71 |
devin = stdin; /* and standard output */ |
72 |
return(final_connect()); /* verify initialization */ |
73 |
} |
74 |
|
75 |
|
76 |
extern struct driver * |
77 |
comm_init( /* set up and execute driver */ |
78 |
char *dname, |
79 |
char *id |
80 |
) |
81 |
{ |
82 |
char *dvcname; |
83 |
int p1[2], p2[2]; |
84 |
char pin[16], pout[16]; |
85 |
/* find driver program */ |
86 |
if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) { |
87 |
eputs(dname); |
88 |
eputs(": not found\n"); |
89 |
return(NULL); |
90 |
} |
91 |
#ifdef RHAS_FORK_EXEC |
92 |
/* open communication pipes */ |
93 |
if (pipe(p1) == -1 || pipe(p2) == -1) |
94 |
goto syserr; |
95 |
if ((devchild = fork()) == 0) { /* fork driver process */ |
96 |
close(p1[1]); |
97 |
close(p2[0]); |
98 |
sprintf(pin, "%d", p1[0]); |
99 |
sprintf(pout, "%d", p2[1]); |
100 |
execl(dvcname, dname, pin, pout, id, 0); |
101 |
perror(dvcname); |
102 |
_exit(127); |
103 |
} |
104 |
if (devchild == -1) |
105 |
goto syserr; |
106 |
close(p1[0]); |
107 |
close(p2[1]); |
108 |
if ((devout = fdopen(p1[1], "w")) == NULL) |
109 |
goto syserr; |
110 |
if ((devin = fdopen(p2[0], "r")) == NULL) |
111 |
goto syserr; |
112 |
return(final_connect()); /* verify initialization */ |
113 |
syserr: |
114 |
perror(dname); |
115 |
return(NULL); |
116 |
|
117 |
#else /* ! RHAS_FORK_EXEC */ |
118 |
|
119 |
eputs(dname); |
120 |
eputs(": no fork/exec\n"); |
121 |
return(NULL); |
122 |
|
123 |
#endif /* ! RHAS_FORK_EXEC */ |
124 |
} |
125 |
|
126 |
|
127 |
static void |
128 |
comm_close(void) /* done with driver */ |
129 |
{ |
130 |
int pid; |
131 |
|
132 |
erract[COMMAND].pf = NULL; /* reset error vectors */ |
133 |
if (erract[WARNING].pf != NULL) |
134 |
erract[WARNING].pf = wputs; |
135 |
fclose(devout); |
136 |
fclose(devin); |
137 |
if (devchild < 0) |
138 |
return; |
139 |
while ((pid = wait(0)) != -1 && pid != devchild) |
140 |
; |
141 |
} |
142 |
|
143 |
|
144 |
static void |
145 |
comm_clear( /* clear screen */ |
146 |
int xres, |
147 |
int yres |
148 |
) |
149 |
{ |
150 |
putc(COM_CLEAR, devout); |
151 |
putw(xres, devout); |
152 |
putw(yres, devout); |
153 |
fflush(devout); |
154 |
} |
155 |
|
156 |
|
157 |
static void |
158 |
comm_paintr( /* paint a rectangle */ |
159 |
COLOR col, |
160 |
int xmin, |
161 |
int ymin, |
162 |
int xmax, |
163 |
int ymax |
164 |
) |
165 |
{ |
166 |
putc(COM_PAINTR, devout); |
167 |
fwrite((char *)col, sizeof(COLOR), 1, devout); |
168 |
putw(xmin, devout); |
169 |
putw(ymin, devout); |
170 |
putw(xmax, devout); |
171 |
putw(ymax, devout); |
172 |
} |
173 |
|
174 |
|
175 |
static void |
176 |
comm_flush(void) /* flush output to driver */ |
177 |
{ |
178 |
putc(COM_FLUSH, devout); |
179 |
fflush(devout); |
180 |
if (getc(devin) != COM_FLUSH) |
181 |
reply_error("flush"); |
182 |
getstate(); |
183 |
} |
184 |
|
185 |
|
186 |
static int |
187 |
comm_getcur( /* get and return cursor position */ |
188 |
int *xp, |
189 |
int *yp |
190 |
) |
191 |
{ |
192 |
int c; |
193 |
|
194 |
putc(COM_GETCUR, devout); |
195 |
fflush(devout); |
196 |
if (getc(devin) != COM_GETCUR) |
197 |
reply_error("getcur"); |
198 |
c = getc(devin); |
199 |
*xp = getw(devin); |
200 |
*yp = getw(devin); |
201 |
return(c); |
202 |
} |
203 |
|
204 |
|
205 |
static void |
206 |
comm_comout( /* print string to command line */ |
207 |
char *str |
208 |
) |
209 |
{ |
210 |
putc(COM_COMOUT, devout); |
211 |
myputs(str, devout); |
212 |
if (str[strlen(str)-1] == '\n') |
213 |
fflush(devout); |
214 |
} |
215 |
|
216 |
|
217 |
static void |
218 |
comm_comin( /* read string from command line */ |
219 |
char *buf, |
220 |
char *prompt |
221 |
) |
222 |
{ |
223 |
putc(COM_COMIN, devout); |
224 |
if (prompt == NULL) |
225 |
putc(0, devout); |
226 |
else { |
227 |
putc(1, devout); |
228 |
myputs(prompt, devout); |
229 |
} |
230 |
fflush(devout); |
231 |
if (getc(devin) != COM_COMIN) |
232 |
reply_error("comin"); |
233 |
mygets(buf, devin); |
234 |
getstate(); |
235 |
} |
236 |
|
237 |
|
238 |
static void |
239 |
mygets( /* get string from file (with nul) */ |
240 |
register char *s, |
241 |
register FILE *fp |
242 |
) |
243 |
{ |
244 |
register int c; |
245 |
|
246 |
while ((c = getc(fp)) != EOF) |
247 |
if ((*s++ = c) == '\0') |
248 |
return; |
249 |
*s = '\0'; |
250 |
} |
251 |
|
252 |
|
253 |
static void |
254 |
myputs( /* put string to file (with nul) */ |
255 |
register char *s, |
256 |
register FILE *fp |
257 |
) |
258 |
{ |
259 |
do |
260 |
putc(*s, fp); |
261 |
while (*s++); |
262 |
} |
263 |
|
264 |
|
265 |
static void |
266 |
reply_error( /* what should we do here? */ |
267 |
char *routine |
268 |
) |
269 |
{ |
270 |
eputs(routine); |
271 |
eputs(": driver reply error\n"); |
272 |
quit(1); |
273 |
} |
274 |
|
275 |
|
276 |
static void |
277 |
getstate(void) /* get driver state variables */ |
278 |
{ |
279 |
fread((char *)&comm_driver.pixaspect, |
280 |
sizeof(comm_driver.pixaspect), 1, devin); |
281 |
comm_driver.xsiz = getw(devin); |
282 |
comm_driver.ysiz = getw(devin); |
283 |
comm_driver.inpready = getw(devin); |
284 |
} |