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devmain.c
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Mon, May 13, 00:00

devmain.c
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#ifndef lint
static const char RCSid[] = "$Id: devmain.c,v 2.5 2016/08/18 00:52:48 greg Exp $";
#endif
/*
* devmain.c - main for independent drivers.
*
* Redefine your initialization routine to dinit.
*/
#include "copyright.h"
#include "standard.h"
#include "color.h"
#include "driver.h"
struct driver *dev = NULL; /* output device */
FILE *devin, *devout; /* communications channels */
char *progname; /* driver name */
int r_clear(), r_paintr(), r_getcur(), r_comout(), r_comin(), r_flush();
int (*dev_func[NREQUESTS])() = { /* request handlers */
r_clear, r_paintr,
r_getcur, r_comout,
r_comin, r_flush
};
main(argc, argv) /* set up communications and main loop */
int argc;
char *argv[];
{
extern struct driver *dinit();
int com;
/* set up I/O */
progname = argv[0];
if (argc < 3) {
eputs("arg count\n");
quit(1);
}
devin = fdopen(atoi(argv[1]), "r");
devout = fdopen(atoi(argv[2]), "w");
if (devin == NULL || devout == NULL || getw(devin) != COM_SENDM) {
eputs("connection failure\n");
quit(1);
}
/* open device */
if ((dev = dinit(argv[0], argv[3])) == NULL)
quit(1);
putw(COM_RECVM, devout); /* verify initialization */
sendstate();
fflush(devout);
/* loop on requests */
while ((com = getc(devin)) != EOF) {
if (com >= NREQUESTS || dev_func[com] == NULL) {
eputs("invalid request\n");
quit(1);
}
(*dev_func[com])(); /* process request */
}
quit(0); /* all done, clean up and exit */
}
void
quit(code) /* close device and exit */
int code;
{
if (dev != NULL)
(*dev->close)();
exit(code);
}
r_clear() /* clear screen */
{
int xres, yres;
xres = getw(devin);
yres = getw(devin);
(*dev->clear)(xres, yres);
}
r_paintr() /* paint a rectangle */
{
COLOR col;
int xmin, ymin, xmax, ymax;
getbinary((char *)col, sizeof(COLOR), 1, devin);
xmin = getw(devin); ymin = getw(devin);
xmax = getw(devin); ymax = getw(devin);
(*dev->paintr)(col, xmin, ymin, xmax, ymax);
}
r_flush() /* flush output */
{
if (dev->flush != NULL)
(*dev->flush)();
putc(COM_FLUSH, devout);
sendstate();
fflush(devout);
}
r_getcur() /* get and return cursor position */
{
int c;
int x, y;
/* get it if we can */
if (dev->getcur == NULL) {
c = ABORT;
x = y = 0;
} else
c = (*dev->getcur)(&x, &y);
/* reply */
putc(COM_GETCUR, devout);
putc(c, devout);
putw(x, devout);
putw(y, devout);
fflush(devout);
}
r_comout() /* print string to command line */
{
char str[256];
mygets(str, devin);
(*dev->comout)(str);
}
r_comin() /* read string from command line */
{
char buf[256], *prompt;
/* get prompt */
if (getc(devin)) {
mygets(buf, devin);
prompt = buf;
} else
prompt = NULL;
/* get string */
(*dev->comin)(buf, prompt);
/* reply */
putc(COM_COMIN, devout);
myputs(buf, devout);
sendstate();
fflush(devout);
}
mygets(s, fp) /* get string from file (with nul) */
register char *s;
register FILE *fp;
{
register int c;
while ((c = getc(fp)) != EOF)
if ((*s++ = c) == '\0')
return;
*s = '\0';
}
myputs(s, fp) /* put string to file (with nul) */
register char *s;
register FILE *fp;
{
do
putc(*s, fp);
while (*s++);
}
void
eputs(s) /* put string to stderr */
register char *s;
{
static int midline = 0;
if (!*s)
return;
if (!midline++) {
fputs(progname, stderr);
fputs(": ", stderr);
}
fputs(s, stderr);
if (s[strlen(s)-1] == '\n') {
fflush(stderr);
midline = 0;
}
}
sendstate() /* send driver state variables */
{
putbinary(&dev->pixaspect, sizeof(dev->pixaspect), 1, devout);
putw(dev->xsiz, devout);
putw(dev->ysiz, devout);
putw(dev->inpready, devout);
}

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