core: add facility2str() function

Add support to get the facility number given the facility string.

dprint.c

@@ -90,13 +90,27 @@ int str2facility(char *s)
 {
 	int i;
 
-	for( i=0; str_fac[i] ; i++) {
+	for (i=0; str_fac[i]; i++) {
 		if (!strcasecmp(s,str_fac[i]))
 			return int_fac[i];
 	}
 	return -1;
 }
 
+char* facility2str(int fl, int *len)
+{
+	int i;
+
+	for (i=0; str_fac[i]; i++) {
+		if (fl == int_fac[i]) {
+			*len = strlen(str_fac[i]);
+			return str_fac[i];
+		}
+	}
+
+	return NULL;
+}
+
 /* fixup function for log_facility cfg parameter */
 int log_facility_fixup(void *handle, str *gname, str *name, void **val)
 {

dprint.h

@@ -160,6 +160,8 @@ extern volatile int dprint_crit;
 #endif
 
 int str2facility(char *s);
+char* facility2str(int fl, int *len);
+
 int log_facility_fixup(void *handle, str *gname, str *name, void **val);
 
 void dprint_color(int level);