Add configurable log level as optional CLI argument

All three programs now accept an optional second argument [log-level]
(trace, debug, info, warning, error, fatal) defaulting to info. The
level is applied by setting the logger context pointer directly,
avoiding a memory leak that would occur from overwriting the
heap-allocated logger struct. Also documents the ASan leak-check
workflow in CLAUDE.md.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/common.c b/src/common.c
index d102868..7d378f1 100644
--- a/src/common.c
+++ b/src/common.c
@@ -59,6 +59,26 @@ loadFile (const char *const path)
  * Security Helpers
  * ======================================================================== */
 
+int
+parseLogLevel (const char *name)
+{
+  static const struct
+  {
+    const char *name;
+    UA_LogLevel level;
+  } levels[] = {
+    { "trace", UA_LOGLEVEL_TRACE }, { "debug", UA_LOGLEVEL_DEBUG },
+    { "info", UA_LOGLEVEL_INFO },   { "warning", UA_LOGLEVEL_WARNING },
+    { "error", UA_LOGLEVEL_ERROR }, { "fatal", UA_LOGLEVEL_FATAL },
+  };
+  for (size_t i = 0; i < sizeof (levels) / sizeof (levels[0]); i++)
+    {
+      if (strcmp (name, levels[i].name) == 0)
+        return (int)levels[i].level;
+    }
+  return -1;
+}
+
 UA_MessageSecurityMode
 parseSecurityMode (const char *name)
 {