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