From 842613e27d4fa993191ab60f3fb133217b96f884 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Per=20Gr=C3=B6n?= <per@lumiary.com>
Date: Fri, 3 Feb 2023 14:16:11 +0000
Subject: [PATCH] Fix array out of bounds access bug

This bug is triggered if a line ends with a command without a number.
---
 src/parser.cpp        | 3 +++
 test/parser_tests.cpp | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/src/parser.cpp b/src/parser.cpp
index c78f9e5..4f459a6 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -247,6 +247,9 @@ namespace gpr {
       string cs = parse_line_comment_with_delimiter(";", s);
       return chunk(';', ';', cs);
     } else {
+      if (s.i + 1 >= s.s.size()) {
+        return parse_isolated_word(s);
+      }
       string next_next = *(s.remaining() + 1);
 
       if (!is_num_char(next_next[0])) {
diff --git a/test/parser_tests.cpp b/test/parser_tests.cpp
index b988c5a..6f962d5 100644
--- a/test/parser_tests.cpp
+++ b/test/parser_tests.cpp
@@ -151,6 +151,12 @@ namespace gpr {
     REQUIRE(p.get_block(0).get_chunk(4).tp() == CHUNK_TYPE_WORD);
   }
 
+  TEST_CASE("Parsing block only an isolated word 'P'") {
+    gcode_program p = parse_gcode("P");
+
+    REQUIRE(p.get_block(0).get_chunk(0).tp() == CHUNK_TYPE_WORD);
+  }
+
   TEST_CASE("Parse blank line") {
     gcode_program p =
       parse_gcode("G99 G82 R0.1 Z-0.1227 P F15.04\n   ");