Generalise the logging function to a function pointer

src/logging.c

@@ -34,6 +34,9 @@ struct UCLogModule_setting {
     int log_level;
 };
 
+struct UCLogArgs;
+typedef void (*uc_vlog_func)(const struct UCLogArgs *args, const char *fmt, va_list ap);
+
 struct UCLogDestination {
     struct TailQ entry;
     enum UC_LOG_DESTINATION dest_type;
@@ -57,6 +60,8 @@ struct UCLogDestination {
             struct UCLogRotateSettings rotate;
         } file;
     } type;
+
+    uc_vlog_func log_func;
 };
 
 /* Helper struct for arguments to our main logging function */
@@ -87,6 +92,9 @@ static const struct UCLogModule g_unknown_module = {
 //this list an anything contained within it.
 static UC_TAILQ_HEAD(g_destinations);
 static int uc_log_reopen_file(struct UCLogDestination *dest);
+static inline void uc_log_file_rotate_if_neeed(struct UCLogDestination *dest, time_t tstamp);
+static void uc_vlog_file(const struct UCLogArgs *args, const char *fmt, va_list ap);
+static void uc_vlog_syslog(const struct UCLogArgs *args, const char *fmt, va_list ap);
 //Uses enum UC_LOG_LEVEL as index
 static const char *const g_log_levels[] = {
     "UNKNOWN_0",
@@ -185,6 +193,7 @@ struct UCLogDestination *uc_log_new_stderr(int log_level, int log_location)
     dest->type.file.size = 0;
     dest->log_level = log_level;;
     dest->log_location = log_location;
+    dest->log_func = uc_vlog_file;
 
    return dest;
 }
@@ -217,6 +226,7 @@ struct UCLogDestination *uc_log_new_syslog(const char *ident, int facility, int
    dest->type.syslog.facility = facility;
    dest->log_level = log_level;;
    dest->log_location = log_location;
+   dest->log_func = uc_vlog_syslog;
 
    return dest;
 }
@@ -261,6 +271,8 @@ struct UCLogDestination *uc_log_new_file(const char *filename, int log_level, in
 
     dest->type.file.rotate.policy = UC_LOG_ROTATE_NONE;
 
+   dest->log_func = uc_vlog_file;
+
    return dest;
 }
 
@@ -453,16 +465,19 @@ void uc_log_init(struct UCLogModules *user_modules)
 }
 
 //hold g_log_lock while calling this
-static inline void uc_vlog_file(const struct UCLogArgs *args, time_t tstamp, const char *fmt, va_list ap)
+static void uc_vlog_file(const struct UCLogArgs *args, const char *fmt, va_list ap)
 {
     struct UCLogDestination *dest = args->dest;
     char time_buf[48];
     struct tm t;
+    time_t tstamp;
     int rc = 0;
 
     if (dest->type.file.file == NULL)
         return;
 
+    tstamp = time(NULL);
+
     localtime_r(&tstamp, &t);
     if (!args->raw) {
         snprintf(time_buf, sizeof time_buf, "%04d-%02d-%02d %02d:%02d:%02d",
@@ -495,10 +510,12 @@ static inline void uc_vlog_file(const struct UCLogArgs *args, time_t tstamp, con
         rc = fflush(dest->type.file.file); //strictly not needed for stderr
                                            // though stderr could be redirected to a file
     }
+
+    uc_log_file_rotate_if_neeed(dest, tstamp);
 }
 
 //hold g_log_lock while calling this
-static inline void uc_vlog_syslog(const struct UCLogArgs *args, const char *fmt, va_list ap)
+static void uc_vlog_syslog(const struct UCLogArgs *args, const char *fmt, va_list ap)
 {
     struct UCLogDestination *dest = args->dest;
     
@@ -705,25 +722,11 @@ void uc_logf(int log_level, int module, int raw,
             .raw = raw
         }; 
 
-        time_t tstamp;
+        //log_func will mess with the va_list,
-        //log func will mess with the va_list,
         //so make a copy
         va_copy(apc, ap);
 
-        switch (dest->dest_type) {
+        dest->log_func(&args, fmt, apc);
-            case UC_LDEST_SYSLOG:
-                uc_vlog_syslog(&args, fmt, apc);
-                break;
-            case UC_LDEST_STDERR:
-                tstamp = time(NULL);
-                uc_vlog_file(&args, tstamp,fmt, apc);
-                break;
-            case UC_LDEST_FILE:
-                tstamp = time(NULL);
-                uc_vlog_file(&args, tstamp, fmt, apc);
-                uc_log_file_rotate_if_neeed(dest, tstamp);
-                break;
-        }
 
         va_end(apc);
     }