logging: Some refactoring

src/nvt_log.c

@@ -14,7 +14,30 @@
 #define gettid() (pid_t)syscall(__NR_gettid)
 
 char            log_level = 0;
-char            log_stdout = 0;
+
+static FILE    *log_dest = NULL;
+
+void nvt_log_dest(int dest)
+{
+    switch (dest)
+    {
+    default:
+    case NVT_LOG_SYSLOG:
+        log_dest = NULL;
+        break;
+    case NVT_LOG_STDOUT:
+        log_dest = stdout;
+        break;
+    case NVT_LOG_STDERR:
+        log_dest = stderr;
+        break;
+    }
+}
+
+void nvt_log_level(int level)
+{
+    log_level = level;
+}
 
 static const char *_hms_txt(char *buf, unsigned int len)
 {
@@ -43,10 +66,10 @@ void nvt_log(int prio, const char *fmt, ...)
     va_start(arg, fmt);
     len = vsnprintf(buf, sizeof(buf), fmt, arg);
 
-    if (log_stdout)
+    if (log_dest)
     {
         eol = (len > 0 && buf[len - 1] != '\n') ? "\n" : "";
-        printf("%s: [%d] %d: %s%s",
+        fprintf(log_dest, "%s: [%d] %d: %s%s",
                 _hms_txt(buft, sizeof(buft)), gettid(), prio, buf, eol);
     }
     else

src/nvt_log.h

@@ -9,12 +9,17 @@
 #define _PRF_N_(no) __attribute__((__format__(__printf__, (no), (no) + 1)))
 #define _PRF2_ _PRF_N_(2)
 
+void            nvt_log_dest(int dest);
+void            nvt_log_level(int level);
 _PRF2_ void     nvt_log(int prio, const char *fmt, ...);
 void            nvt_log_buf(int prio, const char *txt,
                             const void *ptr, unsigned int len);
 
+#define NVT_LOG_SYSLOG  0
+#define NVT_LOG_STDOUT  1
+#define NVT_LOG_STDERR  2
+
 extern char     log_level;
-extern char     log_stdout;
 
 #define DBG(...) \
     if (log_level > 0) nvt_log(LOG_DEBUG, __VA_ARGS__)

src/ttynvt.c

@@ -1192,8 +1192,9 @@ int main(int argc, char *argv[])
         return 1;
     }
 
-    log_level = ttynvt_param.debug;
-    log_stdout = ttynvt_param.logstd;
+    nvt_log_level(ttynvt_param.debug);
+    if (ttynvt_param.logstd)
+        nvt_log_dest(NVT_LOG_STDOUT);
 
     if (!ttynvt_param.dev_name)
         ttynvt_param.dev_name = "ttyNVT0";