Implement buddyinfo suggestions

src/parsers/buddyinfo.cpp

@@ -67,11 +67,9 @@ zone parse_buddyinfo_line(const std::string& line)
 
         zn.name = tokens[ZONE_NAME];
 
-        // std::distance can be negative, but the conditional on line 46
-        // and the nature of the begin() and end() iterators means num_chunks
-        // should never be less than 0.
-        size_t num_chunks =
-            std::distance(tokens.begin() + FIRST_CHUNK, tokens.end());
+        // This line is protected from underflow thanks to the tokens size
+        // conditional above.
+        size_t num_chunks = tokens.size() - FIRST_CHUNK;
 
         zn.chunks.resize(num_chunks);
 

test/test_buddyinfo.cpp

@@ -9,7 +9,7 @@ TEST_CASE("Parse buddyinfo", "[procfs][buddyinfo]")
     pfs::zone expected;
     std::string line;
 
-    SECTION("Sample 1")
+    SECTION("Default size - Sample 1")
     {
         line = "Node 0, zone  Normal   216   55  189  101   84   38   37  "
                " 27    5    3  587";
@@ -19,7 +19,7 @@ TEST_CASE("Parse buddyinfo", "[procfs][buddyinfo]")
         expected.chunks  = {216, 55, 189, 101, 84, 38, 37, 27, 5, 3, 587};
     }
 
-    SECTION("Sample 2")
+    SECTION("Default size - Sample 2")
     {
         line = "Node 1, zone     DMA     1    1    1    0    2    1    1  "
                "  0    1    1    3";
@@ -29,8 +29,7 @@ TEST_CASE("Parse buddyinfo", "[procfs][buddyinfo]")
         expected.chunks  = {1, 1, 1, 0, 2, 1, 1, 0, 1, 1, 3};
     }
 
-    // 9 chunks instead of the default of 11
-    SECTION("Sample 3")
+    SECTION("Custom size - Smaller than default")
     {
         line = "Node 0, zone  Normal   189  101   84   38   37  "
                " 27    5    3  587";