* sources/* : add const on errcb arg

src/sources/files.c

@@ -23,13 +23,13 @@ typedef struct f2b_file_t {
 struct _config {
   char path[256];
   char error[256];
-  void (*errcb)(char *errstr);
+  void (*errcb)(const char *errstr);
   f2b_file_t *files;
   f2b_file_t *current;
 };
 
 static void
-errcb_stub(char *str) {
+errcb_stub(const char *str) {
   assert(str != NULL);
   (void)(str);
 }
@@ -146,7 +146,7 @@ error(cfg_t *cfg) {
 }
 
 void
-errcb(cfg_t *cfg, void (*cb)(char *errstr)) {
+errcb(cfg_t *cfg, void (*cb)(const char *errstr)) {
   assert(cfg != NULL);
   assert(cb  != NULL);
 

src/sources/mcast.c

@@ -21,7 +21,7 @@
 struct _config {
   char name[32];
   char error[256];
-  void (*errcb)(char *errstr);
+  void (*errcb)(const char *errstr);
   char baddr[INET6_ADDRSTRLEN]; /**< bind address */
   char maddr[INET_ADDRSTRLEN];  /**< multicast address */
   char mport[6];                /**< multicast port */
@@ -30,7 +30,7 @@ struct _config {
 };
 
 static void
-errcb_stub(char *str) {
+errcb_stub(const char *str) {
   assert(str != NULL);
   (void)(str);
 }
@@ -97,7 +97,7 @@ error(cfg_t *cfg) {
 }
 
 void
-errcb(cfg_t *cfg, void (*cb)(char *errstr)) {
+errcb(cfg_t *cfg, void (*cb)(const char *errstr)) {
   assert(cfg != NULL);
   assert(cb  != NULL);
 

src/sources/portknock.c

@@ -26,13 +26,13 @@ typedef struct f2b_port_t {
 struct _config {
   char name[32];
   char error[256];
-  void (*errcb)(char *errstr);
+  void (*errcb)(const char *errstr);
   f2b_port_t *ports;
   f2b_port_t *current;
 };
 
 static void
-errcb_stub(char *str) {
+errcb_stub(const char *str) {
   assert(str != NULL);
   (void)(str);
 }
@@ -124,7 +124,7 @@ error(cfg_t *cfg) {
 }
 
 void
-errcb(cfg_t *cfg, void (*cb)(char *errstr)) {
+errcb(cfg_t *cfg, void (*cb)(const char *errstr)) {
   assert(cfg != NULL);
   assert(cb  != NULL);
 

src/sources/source.h

@@ -104,7 +104,7 @@ extern char   *error(cfg_t *cfg);
  * @param cb Error callback
  * @note Optional, if this function is not called, processing errors will be suppressed
  */
-extern void    errcb(cfg_t *cfg, void (*cb)(char *errstr));
+extern void    errcb(cfg_t *cfg, void (*cb)(const char *errstr));
 /**
  * @brief Allocate resources and start processing
  * @param cfg Module handler