+ add 'stdout' variant for log destination

configs/f2b.conf.in

@@ -2,6 +2,7 @@
 includes = ${CMAKE_INSTALL_FULL_SYSCONFDIR}/f2b/conf-enabled
 pidfile = /var/run/f2b.pid
 statedir = ${CMAKE_INSTALL_FULL_LOCALSTATEDIR}/lib/f2b
+; valid destinations: stdout, stderr, syslog, file (logfile option should be set)
 logdest = syslog
 loglevel = info
 logfile = /var/log/f2b.log

src/log.c

@@ -10,7 +10,12 @@
 #include <sys/syslog.h>
 
 static log_msgtype_t minlevel = log_info;
-static enum { log_stderr = 0, log_file = 1, log_syslog = 2 } dest = log_stderr;
+static enum {
+  log_stderr = 0,
+  log_stdout = 1,
+  log_file   = 2,
+  log_syslog = 3
+} dest = log_stderr;
 static FILE *logfile = NULL;
 
 static const char *loglevels[] = {
@@ -79,6 +84,13 @@ void f2b_log_set_level(const char *level) {
   if (strcmp(level, "fatal") == 0) { minlevel = log_fatal; return; }
 }
 
+void f2b_log_to_stdout() {
+  if (logfile && logfile != stdout)
+    fclose(logfile);
+  dest = log_stdout;
+  logfile = stdout;
+}
+
 void f2b_log_to_stderr() {
   if (logfile && logfile != stderr)
     fclose(logfile);

src/log.h

@@ -52,6 +52,8 @@ void f2b_log_set_level(const char *level);
  * @param path Path for logfile
  */
 void f2b_log_to_file  (const char *path);
+/** @brief Use logging to stdout */
+void f2b_log_to_stdout();
 /** @brief Use logging to stderr */
 void f2b_log_to_stderr();
 /** @brief Use logging to syslog */