+static int sball_parsepkt(struct sball *sb, int id, char *data, int len)
+{
+ int i;
+ char c, *rd, *wr;
+
+ /* decode data packet, replacing escaped values with the correct ones */
+ rd = wr = data;
+ while(rd < data + len) {
+ if((c = *rd++) == '^') {
+ switch(*rd++) {
+ case 'Q':
+ *wr++ = 0x11; /* XON */
+ break;
+ case 'S':
+ *wr++ = 0x13; /* XOFF */
+ break;
+ case 'M':
+ *wr++ = 13; /* CR */
+ break;
+ case '^':
+ *wr++ = '^';
+ break;
+ default:
+ fprintf(stderr, "sball decode: ignoring invalid escape code: %xh\n", (unsigned int)c);
+ }
+ } else {
+ *wr++ = c;
+ }
+ }
+ len = wr - data; /* update the decoded length */
+
+ switch(id) {
+ case 'D':
+ if(len != 14) {
+ fprintf(stderr, "sball: invalid data packet, expected 14 bytes, got: %d\n", len);
+ return -1;
+ }
+
+#ifndef SBALL_BIG_ENDIAN
+ for(i=0; i<6; i++) {
+ data += 2;
+ c = data[0];
+ data[0] = data[1];
+ data[1] = c;
+ sb->mot[i] = *(short*)data;
+ }
+#else
+ memcpy(sb->mot, data + 2, 12);
+#endif
+ print_state(sb);
+ break;
+
+ case 'K':
+ if(len != 2) {
+ fprintf(stderr, "sball: invalid key packet, expected 2 bytes, got: %d\n", len);
+ return -1;
+ }
+ if(sb->flags & SB4000) break; /* ignore K packets from spaceball 4000 devices */
+
+ /* data[1] bits 0-3 -> buttons 0,1,2,3
+ * data[1] bits 4,5 (3003 L/R) -> buttons 0, 1
+ * data[0] bits 0-2 -> buttons 4,5,6
+ * data[0] bit 4 is (2003 pick) -> button 7
+ */
+ sb->keystate = (data[1] & 0xf) | ((data[1] >> 4) & 3) | ((data[0] & 7) << 4) |
+ ((data[0] & 0x10) >> 1);
+ print_state(sb);
+ break;
+
+ case '.':
+ if(len != 2) {
+ fprintf(stderr, "sball: invalid sb4k key packet, expected 2 bytes, got: %d\n", len);
+ return -1;
+ }
+ /* spaceball 4000 key packet */
+ sb->flags |= SB4000;
+ /* update orientation flag (actually don't bother) */
+ /*
+ if(data[0] & 0x20) {
+ sb->flags |= FLIPXY;
+ } else {
+ sb->flags &= ~FLIPXY;
+ }
+ */
+
+ /* data[1] bits 0-5 -> buttons 0,1,2,3,4,5
+ * data[1] bit 7 -> button 6
+ * data[0] bits 0-4 -> buttons 7,8,9,10,11
+ */
+ sb->keystate = (data[1] & 0x3f) | ((data[1] & 0x80) >> 1) | ((data[0] & 0x1f) << 7);
+ print_state(sb);
+ break;
+
+ case 'E':
+ fprintf(stderr, "sball: error:");
+ for(i=0; i<len; i++) {
+ if(isprint(data[i])) {
+ fprintf(stderr, " %c", data[i]);
+ } else {
+ fprintf(stderr, " %02xh", (unsigned int)data[i]);
+ }
+ }
+ break;
+
+ case 'M': /* ignore MSS responses */
+ break;
+
+ default:
+ /* DEBUG */
+ fprintf(stderr, "sball: got '%c' packet:", (char)id);
+ for(i=0; i<len; i++) {
+ fprintf(stderr, " %02x", (unsigned int)data[i]);
+ }
+ fputc('\n', stderr);
+ }
+ return 0;
+}
+
+static int guess_num_buttons(const char *verstr)
+{
+ int major, minor;
+ const char *s, *model;
+
+ if((s = strstr(verstr, "Firmware version"))) { /* spaceball */
+
+ /* if we got a model number, guess based on that */
+ if((model = strchr(s, '('))) {
+ if(memcmp(model, "(Model ", 7) == 0) {
+ model += 7;
+ } else {
+ model++;
+ }
+ switch(atoi(model)) {
+ case 2003:
+ return 8;
+ case 3003:
+ return 2;
+ case 5000:
+ return 12;
+ default:
+ break;
+ }
+ }
+ /* try to guess based on firmware number */
+ if(sscanf(s + 17, "%d.%d", &major, &minor) == 2 && major == 2) {
+ if(minor == 35 || minor == 62 || minor == 63) {
+ return 2; /* spaceball 3003/3003C */
+ }
+ if(minor == 42 || minor == 43 || minor == 45) {
+ /* 2.42 is also used by spaceball 2003C, but this should be
+ * caught before we get here by the model number guess
+ */
+ return 12; /* spaceball 4000flx/5000flx-a */
+ }
+ if(minor == 2 || minor == 13 || minor == 15) {
+ return 8; /* spaceball 1003/2003/2003c */
+ }
+ }
+ }
+
+ if(strstr(verstr, "MAGELLAN")) {
+ return 9; /* magellan spacemouse */
+ }
+
+ if(strstr(verstr, "SPACEBALL")) {
+ return 12; /* spaceball 5000 */
+ }
+
+ if(strstr(verstr, "CadMan")) {
+ return 2;
+ }
+
+ fprintf(stderr, "Can't guess number of buttons, default to 8, report this as a bug!\n");
+ return 8;
+}
+