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