| 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 |
|
|
#include <stdio.h> |
| 14 |
|
|
|
| 15 |
|
|
#include <signal.h> |
| 16 |
|
|
|
| 17 |
|
|
#include "color.h" |
| 18 |
|
|
|
| 19 |
|
|
#include "driver.h" |
| 20 |
|
|
|
| 21 |
|
|
#ifndef DEVPATH |
| 22 |
|
|
#define DEVPATH getenv("PATH") /* device search path */ |
| 23 |
|
|
#endif |
| 24 |
|
|
|
| 25 |
|
|
#ifndef BSD |
| 26 |
|
|
#define vfork fork |
| 27 |
|
|
#endif |
| 28 |
|
|
|
| 29 |
|
|
#ifndef WFLUSH |
| 30 |
|
|
#define WFLUSH 30 /* flush after this many rays */ |
| 31 |
|
|
#endif |
| 32 |
|
|
|
| 33 |
|
|
extern char *getpath(), *getenv(); |
| 34 |
|
|
|
| 35 |
|
|
int onsigio(); |
| 36 |
|
|
|
| 37 |
|
|
int comm_close(), comm_clear(), comm_paintr(), comm_errout(), |
| 38 |
|
|
comm_getcur(), comm_comout(), comm_comin(); |
| 39 |
|
|
|
| 40 |
|
|
struct driver comm_driver, comm_default = { |
| 41 |
|
|
comm_close, comm_clear, comm_paintr, comm_getcur, |
| 42 |
|
|
comm_comout, comm_comin, |
| 43 |
|
|
MAXRES, MAXRES, 0 |
| 44 |
|
|
}; |
| 45 |
|
|
|
| 46 |
|
|
FILE *devin, *devout; |
| 47 |
|
|
|
| 48 |
|
|
int devchild; |
| 49 |
|
|
|
| 50 |
|
|
|
| 51 |
|
|
struct driver * |
| 52 |
|
|
comm_init(argv) /* set up and execute driver */ |
| 53 |
|
|
char *argv[]; |
| 54 |
|
|
{ |
| 55 |
|
|
char *devname; |
| 56 |
|
|
int p1[2], p2[2]; |
| 57 |
|
|
|
| 58 |
|
|
if ((devname = getpath(argv[0], DEVPATH)) == NULL) { |
| 59 |
|
|
stderr_v(argv[0]); |
| 60 |
|
|
stderr_v(": not found\n"); |
| 61 |
|
|
return(NULL); |
| 62 |
|
|
} |
| 63 |
|
|
if (pipe(p1) == -1 || pipe(p2) == -1) |
| 64 |
|
|
goto syserr; |
| 65 |
|
|
if ((devchild = vfork()) == 0) { |
| 66 |
|
|
close(p1[1]); |
| 67 |
|
|
close(p2[0]); |
| 68 |
|
|
if (p1[0] != 0) { |
| 69 |
|
|
dup2(p1[0], 0); |
| 70 |
|
|
close(p1[0]); |
| 71 |
|
|
} |
| 72 |
|
|
if (p2[1] != 1) { |
| 73 |
|
|
dup2(p2[1], 1); |
| 74 |
|
|
close(p2[1]); |
| 75 |
|
|
} |
| 76 |
|
|
execv(devname, argv); |
| 77 |
|
|
stderr_v(devname); |
| 78 |
|
|
stderr_v(": cannot execute\n"); |
| 79 |
|
|
_exit(127); |
| 80 |
|
|
} |
| 81 |
|
|
if (devchild == -1) |
| 82 |
|
|
goto syserr; |
| 83 |
|
|
close(p1[0]); |
| 84 |
|
|
close(p2[1]); |
| 85 |
|
|
if ((devout = fdopen(p1[1], "w")) == NULL) |
| 86 |
|
|
goto syserr; |
| 87 |
|
|
if ((devin = fdopen(p2[0], "r")) == NULL) |
| 88 |
|
|
goto syserr; |
| 89 |
|
|
bcopy(&comm_default, &comm_driver, sizeof(comm_driver)); |
| 90 |
|
|
signal(SIGIO, onsigio); |
| 91 |
greg |
1.2 |
cmdvec = comm_comout; /* set error vectors */ |
| 92 |
greg |
1.1 |
if (wrnvec != NULL) |
| 93 |
|
|
wrnvec = comm_comout; |
| 94 |
|
|
return(&comm_driver); |
| 95 |
|
|
syserr: |
| 96 |
|
|
perror(argv[0]); |
| 97 |
|
|
return(NULL); |
| 98 |
|
|
} |
| 99 |
|
|
|
| 100 |
|
|
|
| 101 |
|
|
static |
| 102 |
|
|
comm_close() /* done with driver */ |
| 103 |
|
|
{ |
| 104 |
|
|
int pid; |
| 105 |
|
|
|
| 106 |
greg |
1.2 |
cmdvec = NULL; /* reset error vectors */ |
| 107 |
greg |
1.1 |
if (wrnvec != NULL) |
| 108 |
|
|
wrnvec = stderr_v; |
| 109 |
|
|
signal(SIGIO, SIG_DFL); |
| 110 |
|
|
fclose(devout); |
| 111 |
|
|
fclose(devin); |
| 112 |
|
|
while ((pid = wait(0)) != -1 && pid != devchild) |
| 113 |
|
|
; |
| 114 |
|
|
} |
| 115 |
|
|
|
| 116 |
|
|
|
| 117 |
|
|
static |
| 118 |
|
|
comm_clear(xres, yres) /* clear screen */ |
| 119 |
|
|
int xres, yres; |
| 120 |
|
|
{ |
| 121 |
|
|
putc(COM_CLEAR, devout); |
| 122 |
|
|
fwrite(&xres, sizeof(xres), 1, devout); |
| 123 |
|
|
fwrite(&yres, sizeof(yres), 1, devout); |
| 124 |
|
|
fflush(devout); |
| 125 |
|
|
} |
| 126 |
|
|
|
| 127 |
|
|
|
| 128 |
|
|
static |
| 129 |
|
|
comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */ |
| 130 |
|
|
COLOR col; |
| 131 |
|
|
int xmin, ymin, xmax, ymax; |
| 132 |
|
|
{ |
| 133 |
|
|
extern long nrays; /* number of rays traced */ |
| 134 |
|
|
static long lastflush = 0; /* ray count at last flush */ |
| 135 |
|
|
|
| 136 |
|
|
putc(COM_PAINTR, devout); |
| 137 |
|
|
fwrite(col, sizeof(COLOR), 1, devout); |
| 138 |
|
|
fwrite(&xmin, sizeof(xmin), 1, devout); |
| 139 |
|
|
fwrite(&ymin, sizeof(ymin), 1, devout); |
| 140 |
|
|
fwrite(&xmax, sizeof(xmax), 1, devout); |
| 141 |
|
|
fwrite(&ymax, sizeof(ymax), 1, devout); |
| 142 |
|
|
if (nrays - lastflush >= WFLUSH) { |
| 143 |
|
|
fflush(devout); |
| 144 |
|
|
lastflush = nrays; |
| 145 |
|
|
} |
| 146 |
|
|
} |
| 147 |
|
|
|
| 148 |
|
|
|
| 149 |
|
|
static int |
| 150 |
|
|
comm_getcur(xp, yp) /* get and return cursor position */ |
| 151 |
|
|
int *xp, *yp; |
| 152 |
|
|
{ |
| 153 |
|
|
int c; |
| 154 |
|
|
|
| 155 |
|
|
putc(COM_GETCUR, devout); |
| 156 |
|
|
fflush(devout); |
| 157 |
|
|
if (getc(devin) != COM_GETCUR) |
| 158 |
|
|
reply_error("getcur"); |
| 159 |
|
|
c = getc(devin); |
| 160 |
|
|
fread(xp, sizeof(*xp), 1, devin); |
| 161 |
|
|
fread(yp, sizeof(*yp), 1, devin); |
| 162 |
|
|
return(c); |
| 163 |
|
|
} |
| 164 |
|
|
|
| 165 |
|
|
|
| 166 |
|
|
static |
| 167 |
|
|
comm_comout(str) /* print string to command line */ |
| 168 |
|
|
char *str; |
| 169 |
|
|
{ |
| 170 |
|
|
putc(COM_COMOUT, devout); |
| 171 |
|
|
myputs(str, devout); |
| 172 |
|
|
} |
| 173 |
|
|
|
| 174 |
|
|
|
| 175 |
|
|
static |
| 176 |
|
|
comm_comin(buf) /* read string from command line */ |
| 177 |
|
|
char *buf; |
| 178 |
|
|
{ |
| 179 |
|
|
putc(COM_COMIN, devout); |
| 180 |
|
|
fflush(devout); |
| 181 |
|
|
if (getc(devin) != COM_COMIN) |
| 182 |
|
|
reply_error("comin"); |
| 183 |
|
|
mygets(buf, devin); |
| 184 |
|
|
comm_driver.inpready = 0; |
| 185 |
|
|
} |
| 186 |
|
|
|
| 187 |
|
|
|
| 188 |
|
|
static |
| 189 |
|
|
comm_errout(str) /* display an error message */ |
| 190 |
|
|
char *str; |
| 191 |
|
|
{ |
| 192 |
|
|
comm_comout(str); |
| 193 |
|
|
stderr_v(str); /* send to standard error also */ |
| 194 |
|
|
} |
| 195 |
|
|
|
| 196 |
|
|
|
| 197 |
|
|
static |
| 198 |
|
|
mygets(s, fp) /* get string from file (with nul) */ |
| 199 |
|
|
register char *s; |
| 200 |
|
|
register FILE *fp; |
| 201 |
|
|
{ |
| 202 |
|
|
register int c; |
| 203 |
|
|
|
| 204 |
|
|
while ((c = getc(fp)) != EOF) |
| 205 |
|
|
if ((*s++ = c) == '\0') |
| 206 |
|
|
return; |
| 207 |
|
|
*s = '\0'; |
| 208 |
|
|
} |
| 209 |
|
|
|
| 210 |
|
|
|
| 211 |
|
|
static |
| 212 |
|
|
myputs(s, fp) /* put string to file (with nul) */ |
| 213 |
|
|
register char *s; |
| 214 |
|
|
register FILE *fp; |
| 215 |
|
|
{ |
| 216 |
|
|
do |
| 217 |
|
|
putc(*s, fp); |
| 218 |
|
|
while (*s++); |
| 219 |
|
|
} |
| 220 |
|
|
|
| 221 |
|
|
|
| 222 |
|
|
static |
| 223 |
|
|
reply_error(routine) /* what should we do here? */ |
| 224 |
|
|
char *routine; |
| 225 |
|
|
{ |
| 226 |
|
|
stderr_v(routine); |
| 227 |
|
|
stderr_v(": driver reply error\n"); |
| 228 |
|
|
quit(1); |
| 229 |
|
|
} |
| 230 |
|
|
|
| 231 |
|
|
|
| 232 |
|
|
static |
| 233 |
|
|
onsigio() /* input ready */ |
| 234 |
|
|
{ |
| 235 |
|
|
comm_driver.inpready++; |
| 236 |
|
|
} |
