1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.9 |
static const char RCSid[] = "$Id: devcomm.c,v 2.8 2003/07/02 01:15:20 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
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/* |
5 |
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* devcomm.c - communication routines for separate drivers. |
6 |
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* |
7 |
greg |
2.6 |
* External symbols declared in driver.h |
8 |
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*/ |
9 |
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10 |
greg |
2.7 |
#include "copyright.h" |
11 |
greg |
2.9 |
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12 |
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#include "platform.h" |
13 |
greg |
1.1 |
|
14 |
greg |
1.10 |
#include "standard.h" |
15 |
greg |
1.1 |
|
16 |
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#include "color.h" |
17 |
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18 |
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#include "driver.h" |
19 |
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20 |
greg |
2.2 |
#include "vfork.h" |
21 |
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22 |
greg |
1.1 |
#ifndef DEVPATH |
23 |
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#define DEVPATH getenv("PATH") /* device search path */ |
24 |
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#endif |
25 |
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26 |
greg |
2.6 |
static int comm_getcur(); |
27 |
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static void comm_close(), comm_clear(), comm_paintr(), |
28 |
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comm_comin(), comm_comout(), comm_flush(); |
29 |
greg |
1.1 |
|
30 |
greg |
1.12 |
struct driver comm_driver = { |
31 |
greg |
1.1 |
comm_close, comm_clear, comm_paintr, comm_getcur, |
32 |
greg |
1.12 |
comm_comout, comm_comin, comm_flush |
33 |
greg |
1.1 |
}; |
34 |
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35 |
greg |
2.6 |
static void mygets(), myputs(), reply_error(), getstate(); |
36 |
greg |
2.4 |
|
37 |
greg |
1.1 |
FILE *devin, *devout; |
38 |
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39 |
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int devchild; |
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41 |
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42 |
greg |
2.3 |
static struct driver * |
43 |
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final_connect() /* verify and initialize connection */ |
44 |
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{ |
45 |
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putw(COM_SENDM, devout); |
46 |
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fflush(devout); |
47 |
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if (getw(devin) != COM_RECVM) |
48 |
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return(NULL); |
49 |
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/* get driver parameters */ |
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getstate(); |
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/* set error vectors */ |
52 |
gregl |
2.5 |
erract[COMMAND].pf = comm_comout; |
53 |
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if (erract[WARNING].pf != NULL) |
54 |
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erract[WARNING].pf = comm_comout; |
55 |
greg |
2.3 |
return(&comm_driver); |
56 |
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} |
57 |
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58 |
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59 |
greg |
1.1 |
struct driver * |
60 |
greg |
2.3 |
slave_init(dname, id) /* run rview in slave mode */ |
61 |
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char *dname, *id; |
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{ |
63 |
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devchild = -1; /* we're the slave here */ |
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devout = stdout; /* use standard input */ |
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devin = stdin; /* and standard output */ |
66 |
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return(final_connect()); /* verify initialization */ |
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} |
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69 |
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70 |
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struct driver * |
71 |
greg |
1.7 |
comm_init(dname, id) /* set up and execute driver */ |
72 |
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char *dname, *id; |
73 |
greg |
1.1 |
{ |
74 |
greg |
2.6 |
char *dvcname; |
75 |
greg |
1.1 |
int p1[2], p2[2]; |
76 |
greg |
1.7 |
char pin[16], pout[16]; |
77 |
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/* find driver program */ |
78 |
greg |
2.6 |
if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) { |
79 |
gregl |
2.5 |
eputs(dname); |
80 |
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eputs(": not found\n"); |
81 |
greg |
1.1 |
return(NULL); |
82 |
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} |
83 |
greg |
2.8 |
#ifdef RHAS_FORK_EXEC |
84 |
greg |
1.7 |
/* open communication pipes */ |
85 |
greg |
1.1 |
if (pipe(p1) == -1 || pipe(p2) == -1) |
86 |
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goto syserr; |
87 |
greg |
1.7 |
if ((devchild = vfork()) == 0) { /* fork driver process */ |
88 |
greg |
1.1 |
close(p1[1]); |
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close(p2[0]); |
90 |
greg |
1.7 |
sprintf(pin, "%d", p1[0]); |
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sprintf(pout, "%d", p2[1]); |
92 |
greg |
2.6 |
execl(dvcname, dname, pin, pout, id, 0); |
93 |
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perror(dvcname); |
94 |
greg |
1.1 |
_exit(127); |
95 |
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} |
96 |
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if (devchild == -1) |
97 |
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goto syserr; |
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close(p1[0]); |
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close(p2[1]); |
100 |
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if ((devout = fdopen(p1[1], "w")) == NULL) |
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goto syserr; |
102 |
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if ((devin = fdopen(p2[0], "r")) == NULL) |
103 |
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goto syserr; |
104 |
greg |
2.3 |
return(final_connect()); /* verify initialization */ |
105 |
greg |
1.1 |
syserr: |
106 |
greg |
1.7 |
perror(dname); |
107 |
greg |
1.1 |
return(NULL); |
108 |
greg |
2.8 |
|
109 |
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#else /* ! RHAS_FORK_EXEC */ |
110 |
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111 |
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eputs(dname); |
112 |
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eputs(": no fork/exec\n"); |
113 |
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return(NULL); |
114 |
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115 |
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#endif /* ! RHAS_FORK_EXEC */ |
116 |
greg |
1.1 |
} |
117 |
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118 |
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119 |
greg |
2.6 |
static void |
120 |
greg |
1.1 |
comm_close() /* done with driver */ |
121 |
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{ |
122 |
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int pid; |
123 |
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124 |
gregl |
2.5 |
erract[COMMAND].pf = NULL; /* reset error vectors */ |
125 |
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if (erract[WARNING].pf != NULL) |
126 |
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erract[WARNING].pf = wputs; |
127 |
greg |
1.1 |
fclose(devout); |
128 |
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fclose(devin); |
129 |
greg |
2.3 |
if (devchild < 0) |
130 |
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return; |
131 |
greg |
1.1 |
while ((pid = wait(0)) != -1 && pid != devchild) |
132 |
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; |
133 |
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} |
134 |
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135 |
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136 |
greg |
2.6 |
static void |
137 |
greg |
1.1 |
comm_clear(xres, yres) /* clear screen */ |
138 |
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int xres, yres; |
139 |
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{ |
140 |
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putc(COM_CLEAR, devout); |
141 |
greg |
1.8 |
putw(xres, devout); |
142 |
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putw(yres, devout); |
143 |
greg |
1.1 |
fflush(devout); |
144 |
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} |
145 |
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146 |
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147 |
greg |
2.6 |
static void |
148 |
greg |
1.1 |
comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */ |
149 |
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COLOR col; |
150 |
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int xmin, ymin, xmax, ymax; |
151 |
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{ |
152 |
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putc(COM_PAINTR, devout); |
153 |
greg |
1.10 |
fwrite((char *)col, sizeof(COLOR), 1, devout); |
154 |
greg |
1.8 |
putw(xmin, devout); |
155 |
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putw(ymin, devout); |
156 |
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putw(xmax, devout); |
157 |
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putw(ymax, devout); |
158 |
greg |
1.12 |
} |
159 |
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160 |
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161 |
greg |
2.6 |
static void |
162 |
greg |
1.12 |
comm_flush() /* flush output to driver */ |
163 |
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{ |
164 |
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putc(COM_FLUSH, devout); |
165 |
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fflush(devout); |
166 |
greg |
1.13 |
if (getc(devin) != COM_FLUSH) |
167 |
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reply_error("flush"); |
168 |
greg |
1.17 |
getstate(); |
169 |
greg |
1.1 |
} |
170 |
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171 |
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172 |
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static int |
173 |
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comm_getcur(xp, yp) /* get and return cursor position */ |
174 |
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int *xp, *yp; |
175 |
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{ |
176 |
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int c; |
177 |
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178 |
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putc(COM_GETCUR, devout); |
179 |
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fflush(devout); |
180 |
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if (getc(devin) != COM_GETCUR) |
181 |
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reply_error("getcur"); |
182 |
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c = getc(devin); |
183 |
greg |
1.8 |
*xp = getw(devin); |
184 |
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*yp = getw(devin); |
185 |
greg |
1.1 |
return(c); |
186 |
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} |
187 |
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188 |
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189 |
greg |
2.6 |
static void |
190 |
greg |
1.1 |
comm_comout(str) /* print string to command line */ |
191 |
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char *str; |
192 |
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{ |
193 |
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putc(COM_COMOUT, devout); |
194 |
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myputs(str, devout); |
195 |
greg |
1.18 |
if (str[strlen(str)-1] == '\n') |
196 |
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fflush(devout); |
197 |
greg |
1.1 |
} |
198 |
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199 |
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200 |
greg |
2.6 |
static void |
201 |
greg |
1.11 |
comm_comin(buf, prompt) /* read string from command line */ |
202 |
greg |
1.1 |
char *buf; |
203 |
greg |
1.11 |
char *prompt; |
204 |
greg |
1.1 |
{ |
205 |
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putc(COM_COMIN, devout); |
206 |
greg |
1.11 |
if (prompt == NULL) |
207 |
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putc(0, devout); |
208 |
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else { |
209 |
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putc(1, devout); |
210 |
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myputs(prompt, devout); |
211 |
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} |
212 |
greg |
1.1 |
fflush(devout); |
213 |
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if (getc(devin) != COM_COMIN) |
214 |
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reply_error("comin"); |
215 |
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mygets(buf, devin); |
216 |
greg |
1.17 |
getstate(); |
217 |
greg |
1.1 |
} |
218 |
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219 |
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220 |
greg |
2.6 |
static void |
221 |
greg |
1.1 |
mygets(s, fp) /* get string from file (with nul) */ |
222 |
|
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register char *s; |
223 |
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register FILE *fp; |
224 |
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{ |
225 |
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register int c; |
226 |
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227 |
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while ((c = getc(fp)) != EOF) |
228 |
|
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if ((*s++ = c) == '\0') |
229 |
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return; |
230 |
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*s = '\0'; |
231 |
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} |
232 |
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233 |
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234 |
greg |
2.6 |
static void |
235 |
greg |
1.1 |
myputs(s, fp) /* put string to file (with nul) */ |
236 |
|
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register char *s; |
237 |
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register FILE *fp; |
238 |
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{ |
239 |
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do |
240 |
|
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putc(*s, fp); |
241 |
|
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while (*s++); |
242 |
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} |
243 |
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244 |
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245 |
greg |
2.6 |
static void |
246 |
greg |
1.1 |
reply_error(routine) /* what should we do here? */ |
247 |
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char *routine; |
248 |
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{ |
249 |
gregl |
2.5 |
eputs(routine); |
250 |
|
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eputs(": driver reply error\n"); |
251 |
greg |
1.1 |
quit(1); |
252 |
greg |
1.17 |
} |
253 |
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254 |
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255 |
greg |
2.6 |
static void |
256 |
greg |
1.17 |
getstate() /* get driver state variables */ |
257 |
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{ |
258 |
|
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fread((char *)&comm_driver.pixaspect, |
259 |
|
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sizeof(comm_driver.pixaspect), 1, devin); |
260 |
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comm_driver.xsiz = getw(devin); |
261 |
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comm_driver.ysiz = getw(devin); |
262 |
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comm_driver.inpready = getw(devin); |
263 |
greg |
1.1 |
} |