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#ifndef lint
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static const char RCSid[] = "$Id: devcomm.c,v 2.19 2016/08/18 00:52:48 greg Exp $";
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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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* External symbols declared in driver.h
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*/
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#include "copyright.h"
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#include <sys/types.h>
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#if !defined(_WIN32) && !defined(_WIN64)
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#include <sys/wait.h>
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#endif
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#include "paths.h"
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#include "platform.h"
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#include "standard.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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FILE *devin, *devout;
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int devchild;
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static struct driver * final_connect(void);
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static void mygets(char *s, FILE *fp);
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static void myputs(const char *s, FILE *fp);
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static void reply_error(char *routine);
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static void getstate(void);
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static dr_closef_t comm_close;
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static dr_clearf_t comm_clear;
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static dr_paintrf_t comm_paintr;
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static dr_getcurf_t comm_getcur;
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static dr_comoutf_t comm_comout;
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static dr_cominf_t comm_comin;
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static dr_flushf_t comm_flush;
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struct driver comm_driver = {
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comm_close, comm_clear, comm_paintr, comm_getcur,
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comm_comout, comm_comin, comm_flush
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};
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static struct driver *
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final_connect(void) /* verify and initialize connection */
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{
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putw(COM_SENDM, devout);
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fflush(devout);
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if (getw(devin) != COM_RECVM)
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return(NULL);
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/* get driver parameters */
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getstate();
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/* set error vectors */
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erract[COMMAND].pf = comm_comout;
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/* doesn't work with raypcalls.c
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if (erract[WARNING].pf != NULL)
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erract[WARNING].pf = comm_comout;
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*/
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return(&comm_driver);
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}
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struct driver *
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slave_init( /* run rview in slave mode */
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char *dname,
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char *id
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)
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{
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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 */
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return(final_connect()); /* verify initialization */
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}
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struct driver *
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comm_init( /* set up and execute driver */
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char *dname,
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char *id
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)
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{
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char *dvcname;
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int p1[2], p2[2];
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char pin[16], pout[16];
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/* find driver program */
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if ((dvcname = getpath(dname, DEVPATH, X_OK)) == NULL) {
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eputs(dname);
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eputs(": not found\n");
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return(NULL);
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}
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#ifdef RHAS_FORK_EXEC
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/* open communication pipes */
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if (pipe(p1) == -1 || pipe(p2) == -1)
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goto syserr;
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if ((devchild = fork()) == 0) { /* fork driver process */
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close(p1[1]);
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close(p2[0]);
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sprintf(pin, "%d", p1[0]);
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sprintf(pout, "%d", p2[1]);
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execl(dvcname, dname, pin, pout, id, NULL);
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perror(dvcname);
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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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/*
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* Close write stream on exec to avoid multiprocessing deadlock.
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* No use in read stream without it, so set flag there as well.
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*/
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fcntl(p1[1], F_SETFD, FD_CLOEXEC);
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fcntl(p2[0], F_SETFD, FD_CLOEXEC);
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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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return(final_connect()); /* verify initialization */
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syserr:
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perror(dname);
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return(NULL);
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#else /* ! RHAS_FORK_EXEC */
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eputs(dname);
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eputs(": no fork/exec\n");
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return(NULL);
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#endif /* ! RHAS_FORK_EXEC */
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}
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static void
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comm_close(void) /* done with driver */
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{
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int pid;
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erract[COMMAND].pf = NULL; /* reset error vectors */
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if (erract[WARNING].pf != NULL)
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erract[WARNING].pf = wputs;
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fclose(devout);
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fclose(devin);
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if (devchild < 0)
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return;
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#if !defined(_WIN32) && !defined(_WIN64)
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while ((pid = wait(0)) != -1 && pid != devchild)
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;
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#endif
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}
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static void
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comm_clear( /* clear screen */
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int xres,
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int yres
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)
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{
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putc(COM_CLEAR, devout);
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putw(xres, devout);
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putw(yres, devout);
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fflush(devout);
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}
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static void
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comm_paintr( /* paint a rectangle */
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COLOR col,
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int xmin,
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int ymin,
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int xmax,
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int ymax
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)
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{
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putc(COM_PAINTR, devout);
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putbinary(col, sizeof(COLOR), 1, devout);
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putw(xmin, devout);
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putw(ymin, devout);
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putw(xmax, devout);
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putw(ymax, devout);
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}
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static void
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comm_flush(void) /* flush output to driver */
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{
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putc(COM_FLUSH, devout);
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fflush(devout);
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if (getc(devin) != COM_FLUSH)
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reply_error("flush");
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getstate();
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}
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static int
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comm_getcur( /* get and return cursor position */
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int *xp,
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int *yp
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)
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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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*xp = getw(devin);
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*yp = getw(devin);
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return(c);
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}
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static void
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comm_comout( /* print string to command line */
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const char *str
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)
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{
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putc(COM_COMOUT, devout);
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myputs(str, devout);
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if (str[strlen(str)-1] == '\n')
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fflush(devout);
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}
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static void
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comm_comin( /* read string from command line */
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char *buf,
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char *prompt
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)
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{
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putc(COM_COMIN, devout);
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if (prompt == NULL)
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putc(0, devout);
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else {
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putc(1, devout);
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myputs(prompt, devout);
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}
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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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getstate();
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}
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static void
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mygets( /* get string from file (with nul) */
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char *s,
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FILE *fp
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)
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{
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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 void
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myputs( /* put string to file (with nul) */
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const char *s,
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FILE *fp
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)
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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 void
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reply_error( /* what should we do here? */
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char *routine
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)
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{
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eputs(routine);
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eputs(": driver reply error\n");
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quit(1);
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}
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static void
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getstate(void) /* get driver state variables */
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{
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getbinary((char *)&comm_driver.pixaspect,
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sizeof(comm_driver.pixaspect), 1, devin);
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comm_driver.xsiz = getw(devin);
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comm_driver.ysiz = getw(devin);
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comm_driver.inpready = getw(devin);
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}
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