Add doxygen function headers

src/util.c

@@ -9,12 +9,24 @@
 #include <stdio.h>
 #include <stdarg.h>
 
+
+/**
+ * @description Wrapper around getenv(3), allowing to set a default value
+ * @param name The name of the environment variable
+ * @param dflt The default value to set if the variable is not present.
+ * @return default value or value of environment variable.
+ */
 const char *getenv_default(const char *name, const char *dflt)
 {
     return getenv(name) ? : dflt;
 }
 
 
+/**
+ * @description Centralized exit point, called due to an error
+ * @param msg The message to display on stderr before killing the program
+ * @param ... Values for the format string.
+ */
 void die(const char *msg, ...)
 {
     va_list args;