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/* Copyright (c) 1988 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* devcomm.c - communication routines for separate drivers.
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*
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* 10/5/88
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*/
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#include <stdio.h>
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#include <signal.h>
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#include "color.h"
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#include "driver.h"
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#ifndef DEVPATH
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#define DEVPATH getenv("PATH") /* device search path */
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#endif
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#ifndef BSD
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#define vfork fork
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#endif
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#ifndef WFLUSH
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#define WFLUSH 50 /* flush after this many rays */
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#endif
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extern char *getpath(), *getenv();
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int onsigio();
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int comm_close(), comm_clear(), comm_paintr(), comm_errout(),
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comm_getcur(), comm_comout(), comm_comin();
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struct driver comm_driver, comm_default = {
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comm_close, comm_clear, comm_paintr, comm_getcur,
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comm_comout, comm_comin,
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MAXRES, MAXRES, 0
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};
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FILE *devin, *devout;
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int devchild;
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struct driver *
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comm_init(argv) /* set up and execute driver */
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char *argv[];
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{
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char *devname;
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int p1[2], p2[2];
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if ((devname = getpath(argv[0], DEVPATH)) == NULL) {
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stderr_v(argv[0]);
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stderr_v(": not found\n");
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return(NULL);
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}
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if (pipe(p1) == -1 || pipe(p2) == -1)
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goto syserr;
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if ((devchild = vfork()) == 0) {
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close(p1[1]);
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close(p2[0]);
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if (p1[0] != 0) {
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dup2(p1[0], 0);
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close(p1[0]);
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}
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if (p2[1] != 1) {
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dup2(p2[1], 1);
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close(p2[1]);
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}
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execv(devname, argv);
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stderr_v(devname);
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stderr_v(": cannot execute\n");
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_exit(127);
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}
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if (devchild == -1)
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goto syserr;
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close(p1[0]);
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close(p2[1]);
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if ((devout = fdopen(p1[1], "w")) == NULL)
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goto syserr;
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if ((devin = fdopen(p2[0], "r")) == NULL)
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goto syserr;
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bcopy(&comm_default, &comm_driver, sizeof(comm_driver));
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signal(SIGIO, onsigio);
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cmdvec = comm_comout; /* set error vectors */
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if (wrnvec != NULL)
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wrnvec = comm_comout;
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return(&comm_driver);
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syserr:
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perror(argv[0]);
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return(NULL);
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}
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static
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comm_close() /* done with driver */
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{
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int pid;
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cmdvec = NULL; /* reset error vectors */
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if (wrnvec != NULL)
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wrnvec = stderr_v;
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signal(SIGIO, SIG_DFL);
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fclose(devout);
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fclose(devin);
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while ((pid = wait(0)) != -1 && pid != devchild)
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;
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}
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static
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comm_clear(xres, yres) /* clear screen */
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int xres, yres;
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{
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putc(COM_CLEAR, devout);
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fwrite(&xres, sizeof(xres), 1, devout);
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fwrite(&yres, sizeof(yres), 1, devout);
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fflush(devout);
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}
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static
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comm_paintr(col, xmin, ymin, xmax, ymax) /* paint a rectangle */
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COLOR col;
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int xmin, ymin, xmax, ymax;
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{
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extern long nrays; /* number of rays traced */
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static long lastflush = 0; /* ray count at last flush */
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putc(COM_PAINTR, devout);
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fwrite(col, sizeof(COLOR), 1, devout);
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fwrite(&xmin, sizeof(xmin), 1, devout);
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fwrite(&ymin, sizeof(ymin), 1, devout);
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fwrite(&xmax, sizeof(xmax), 1, devout);
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fwrite(&ymax, sizeof(ymax), 1, devout);
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if (nrays - lastflush >= WFLUSH) {
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fflush(devout);
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lastflush = nrays;
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}
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}
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static int
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comm_getcur(xp, yp) /* get and return cursor position */
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int *xp, *yp;
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{
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int c;
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putc(COM_GETCUR, devout);
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fflush(devout);
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if (getc(devin) != COM_GETCUR)
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reply_error("getcur");
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c = getc(devin);
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fread(xp, sizeof(*xp), 1, devin);
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fread(yp, sizeof(*yp), 1, devin);
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return(c);
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}
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static
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comm_comout(str) /* print string to command line */
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char *str;
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{
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putc(COM_COMOUT, devout);
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myputs(str, devout);
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fflush(devout);
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}
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static
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comm_comin(buf) /* read string from command line */
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char *buf;
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{
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putc(COM_COMIN, devout);
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fflush(devout);
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if (getc(devin) != COM_COMIN)
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reply_error("comin");
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mygets(buf, devin);
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comm_driver.inpready = 0;
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}
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static
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comm_errout(str) /* display an error message */
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char *str;
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{
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comm_comout(str);
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stderr_v(str); /* send to standard error also */
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}
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static
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mygets(s, fp) /* get string from file (with nul) */
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register char *s;
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register FILE *fp;
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{
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register int c;
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while ((c = getc(fp)) != EOF)
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if ((*s++ = c) == '\0')
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return;
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*s = '\0';
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}
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static
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myputs(s, fp) /* put string to file (with nul) */
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register char *s;
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register FILE *fp;
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{
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do
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putc(*s, fp);
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while (*s++);
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}
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static
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reply_error(routine) /* what should we do here? */
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char *routine;
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{
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stderr_v(routine);
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stderr_v(": driver reply error\n");
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quit(1);
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}
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static
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onsigio() /* input ready */
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{
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comm_driver.inpready++;
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}
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