do not ignore negative characters (e.g. EOF and partial EOF); fix #2361 fix #2369

src/parse.y

@@ -3373,7 +3373,9 @@ nextc(parser_state *p)
         c = (unsigned char)*p->s++;
       }
   }
-  p->column++;
+  if (c >= 0) {
+    p->column++;
+  }
   if (c == '\r') {
     c = nextc(p);
     if (c != '\n') {
@@ -3396,8 +3398,9 @@ nextc(parser_state *p)
 static void
 pushback(parser_state *p, int c)
 {
-  if (c < 0) return;
-  p->column--;
+  if (c >= 0) {
+    p->column--;
+  }
   p->pb = cons((node*)(intptr_t)c, p->pb);
 }
 
@@ -3421,7 +3424,7 @@ peekc_n(parser_state *p, int n)
 
   do {
     c0 = nextc(p);
-    if (c0 < 0) return c0;
+    if (c0 == -1) return c0;    /* do not skip partial EOF */
     list = push(list, (node*)(intptr_t)c0);
   } while(n--);
   if (p->pb) {