Address review comments

cpp/ql/lib/change-notes/2022-02-02-detect-creat-in-openat.md

@@ -1,4 +1,4 @@
 ---
 category: minorAnalysis
 ---
-* he `cpp/world-writable-file-creation` query now only detects `open` and `openat` calls with the `O_CREAT` or `O_TMPFILE` flag.
+* The `cpp/world-writable-file-creation` query now only detects `open` and `openat` calls with the `O_CREAT` or `O_TMPFILE` flag.

cpp/ql/lib/semmle/code/cpp/commons/unix/Constants.qll

@@ -13,7 +13,7 @@ bindingset[input]
 int parseOctal(string input) {
   input.regexpMatch("0[0-7]+") and
   result =
-    sum(int ix |
+    strictsum(int ix |
       ix in [1 .. input.length()]
     |
       8.pow(input.length() - (ix + 1)) * input.charAt(ix).toInt()

cpp/ql/src/Security/CWE/CWE-732/FilePermissions.qll

@@ -6,7 +6,7 @@ int parseHex(string input) {
   exists(string lowerCaseInput | lowerCaseInput = input.toLowerCase() |
     lowerCaseInput.regexpMatch("0x[0-9a-f]+") and
     result =
-      sum(int ix |
+      strictsum(int ix |
         ix in [2 .. input.length()]
       |
         16.pow(input.length() - (ix + 1)) * "0123456789abcdef".indexOf(lowerCaseInput.charAt(ix))
@@ -14,6 +14,10 @@ int parseHex(string input) {
   )
 }
 
+/**
+ * Gets the value defined by the `O_CREAT` macro if the macro
+ * exists and if every definition defines the same value.
+ */
 int o_creat() {
   result =
     unique(int v |
@@ -23,6 +27,10 @@ int o_creat() {
     )
 }
 
+/**
+ * Gets the value defined by the `O_TMPFILE` macro if the macro
+ * exists and if every definition defines the same value.
+ */
 int o_tmpfile() {
   result =
     unique(int v |