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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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|
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#include "copyright.h" |
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|
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#include "standard.h" |
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|
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#include "color.h" |
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|
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#include "driver.h" |
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|
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struct driver *dev = NULL; /* output device */ |
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|
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FILE *devin, *devout; /* communications channels */ |
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|
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char *progname; /* driver name */ |
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|
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int r_clear(), r_paintr(), r_getcur(), r_comout(), r_comin(), r_flush(); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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mygets(str, devin); |
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(*dev->comout)(str); |
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} |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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} |
