msg-filters: added filter for too-many event in csdiff

Resolves: issues.redhat.com/browse/OSH-496

Added filter and test for error[too-many] findings in csdiff in order to apply the filter deterministically even if the location and the number of occurrences vary

Author: jperezdealgaba

src/lib/msg-filter.cc

@@ -78,6 +78,8 @@ MsgFilter::MsgFilter():
     d(new Private)
 {
     d->addMsgFilter("", "[0-9][0-9]* out of [0-9][0-9]* times");
+    // ignore error[too-many] events
+    d->addMsgFilter("", "[0-9]+ occurrences of warning\\[.*\\] exceeded the specified limit [0-9]+");
     d->addMsgFilter("UNUSED_VALUE",
             "\\(instance [0-9]+\\)");
     d->addMsgFilter("STRING_OVERFLOW",

tests/csdiff/CMakeLists.txt

@@ -90,5 +90,6 @@ test_csdiff(diff-misc 22-kernel-zstream-path)
 test_csdiff(diff-misc 23-cov-parser-key-event)
 test_csdiff(diff-misc 24-shellcheck-line-content)
 test_csdiff(diff-misc 25-llvm-17-path-filter)
+test_csdiff(diff-misc 26-too-many-events-filter)
 
 add_subdirectory(filter-file)

tests/csdiff/diff-misc/26-too-many-events-filter-add-z.err

@@ -0,0 +1,3 @@
+Error: SNYK_CODE_WARNING (CWE-190):
+<unknown>: error[too-many]: 15234 occurrences of warning[cpp/IntegerOverflow] exceeded the specified limit 1030123
+sqlite-src-3260000/tsrc/fts456.c:1304:5: note: 573 occurrences of warning[cpp/IntegerOverflow] were discarded because of this

tests/csdiff/diff-misc/26-too-many-events-filter-add.err

@@ -0,0 +1,5 @@
+Error: SNYK_CODE_WARNING (CWE-190):
+<unknown>: error[too-many]: 1573 occurrences of warning[cpp/IntegerOverflow] exceeded the specified limit 1024
+sqlite-src-3260000/tsrc/fts3.c:1304:5: note: 573 occurrences of warning[cpp/IntegerOverflow] were discarded because of this
+
+