Only recognise DECCPR as a position report, so it is distinct from F3

demo.c

@@ -61,12 +61,12 @@ int main(int argc, char *argv[])
       if(key.type == TERMKEY_TYPE_MOUSE) {
         int line, col;
         termkey_interpret_mouse(tk, &key, NULL, NULL, &line, &col);
-        printf("%s at line=%d, col=%d)\n", buffer, line, col);
+        printf("%s at line=%d, col=%d\n", buffer, line, col);
       }
       else if(key.type == TERMKEY_TYPE_POSITION) {
         int line, col;
         termkey_interpret_position(tk, &key, &line, &col);
-        printf("Cursor position report at line=%d, col=%d)\n", line, col);
+        printf("Cursor position report at line=%d, col=%d\n", line, col);
       }
       else {
         printf("%s\n", buffer);
@@ -80,7 +80,7 @@ int main(int argc, char *argv[])
       if(key.type == TERMKEY_TYPE_UNICODE &&
          key.modifiers == 0 &&
          key.code.codepoint == '?') {
-        printf("\033[6n");
+        printf("\033[?6n");
         fflush(stdout);
       }
     }

driver-csi.c

@@ -257,30 +257,23 @@ TermKeyResult termkey_interpret_mouse(TermKey *tk, const TermKeyKey *key, TermKe
 }
 
 /*
- * Handler for CSI R position reports
+ * Handler for CSI ? R position reports
  * A plain CSI R with no arguments is probably actually <F3>
  */
 
 static TermKeyResult handle_csi_R(TermKey *tk, TermKeyKey *key, int cmd, long *arg, int args)
 {
   switch(cmd) {
-    case 'R':
-      switch(args) {
-        case 0:
-          key->type = TERMKEY_TYPE_FUNCTION;
-          key->code.number = 3;
-          return TERMKEY_RES_KEY;
+    case 'R'|'?'<<8:
+      if(args < 2)
+        return TERMKEY_RES_NONE;
 
-        case 2:
-          key->type = TERMKEY_TYPE_POSITION;
-          termkey_key_set_linecol(key, arg[1], arg[0]);
-          return TERMKEY_RES_KEY;
+      key->type = TERMKEY_TYPE_POSITION;
+      termkey_key_set_linecol(key, arg[1], arg[0]);
+      return TERMKEY_RES_KEY;
 
-        default:
-          return TERMKEY_RES_NONE;
-      }
     default:
-      return TERMKEY_RES_NONE;
+      return handle_csi_ss3_full(tk, key, cmd, arg, args);
   }
 }
 

man/termkey.7

@@ -132,7 +132,7 @@ protocol (\f(CWCSI M\fP followed by three bytes),
 .SM SGR
 encoding (\f(CWCSI < ... M\fP, as requested by \f(CWCSI ? 1006 h\fP), and rxvt encoding (\f(CWCSI ... M\fP, as requested by \f(CWCSI ? 1015 h\fP). Which encoding is in use is inferred automatically by \fBtermkey\fP, and does not need to be specified explicitly.
 .SS Position Events
-The \fBTERMKEY_TYPE_POSITION\fP event type indicates a cursor position report. This is typically sent by a terminal in response to the Report Cursor Position command (\f(CWCSI 6 n\fP). The event bytes are opaque, but can be obtained by calling \fBtermkey_interpret_position\fP(3) passing the event structure and pointers to integers to store the result in.
+The \fBTERMKEY_TYPE_POSITION\fP event type indicates a cursor position report. This is typically sent by a terminal in response to the Report Cursor Position command (\f(CWCSI ? 6 n\fP). The event bytes are opaque, but can be obtained by calling \fBtermkey_interpret_position\fP(3) passing the event structure and pointers to integers to store the result in. Note that only a DEC CPR sequence (\f(CWCSI ? R\fP) is recognised, and not the non-DEC prefixed \f(CWCSI R\fP because the latter could be interpreted as the \f(CWF3\fP function key instead.
 .SS Unrecognised CSIs
 The \fBTERMKEY_TYPE_UNKNOWN_CSI\fP event type indicates a CSI sequence that the \fBtermkey\fP does not recognise. It will have been extracted from the stream, but is available to the application to inspect by calling \fBtermkey_interpret_csi\fP(3). It is important that if the application wishes to inspect this sequence it is done immediately, before any other IO operations on the \fBtermkey\fP instance (specifically, before calling \fBtermkey_waitkey\fP() or \fBtermkey_getkey\fP() again), otherwise the buffer space consumed by the sequence will be overwritten.
 .SH "SEE ALSO"

t/31position.c

@@ -11,7 +11,7 @@ int main(int argc, char *argv[])
 
   tk = termkey_new_abstract("vt100", 0);
 
-  termkey_push_bytes(tk, "\e[15;7R", 7);
+  termkey_push_bytes(tk, "\e[?15;7R", 8);
 
   is_int(termkey_getkey(tk, &key), TERMKEY_RES_KEY, "getkey yields RES_KEY for position report");