2 files changed, 15 insertions, 15 deletions

diff --git a/include/plist/plist.h b/include/plist/plist.h
index b666d2f..c5af845 100644
--- a/include/plist/plist.h
+++ b/include/plist/plist.h
@@ -50,17 +50,17 @@ typedef enum {
 plist_t plist_new_dict();
 plist_t plist_new_array();
 //Plist edition, create a new root if node is NULL
-plist_t plist_add_sub_element( plist_t node, plist_type type, void* value, uint64_t length);
+plist_t plist_add_sub_element( plist_t node, plist_type type, const void* value, uint64_t length);
 
 //Plist edition, only work for dict and array node
 void plist_add_sub_node(plist_t node, plist_t subnode);
 
-void plist_add_sub_key_el(plist_t node, char* val);
-void plist_add_sub_string_el(plist_t node, char* val);
+void plist_add_sub_key_el(plist_t node, const char* val);
+void plist_add_sub_string_el(plist_t node, const char* val);
 void plist_add_sub_bool_el(plist_t node, uint8_t val);
 void plist_add_sub_uint_el(plist_t node, uint64_t val);
 void plist_add_sub_real_el(plist_t node, double val);
-void plist_add_sub_data_el(plist_t node, char* val, uint64_t length);
+void plist_add_sub_data_el(plist_t node, const char* val, uint64_t length);
 
 
 //plist free
@@ -72,9 +72,9 @@ plist_t plist_get_next_sibling(plist_t node);
 plist_t plist_get_prev_sibling(plist_t node);
 
 //utili function to find first (and only the first encountred) corresponding node
-plist_t plist_find_node(plist_t plist, plist_type type, void *value, uint64_t length);
-plist_t plist_find_node_by_key(plist_t plist, char *value);
-plist_t plist_find_node_by_string(plist_t plist, char *value);
+plist_t plist_find_node(plist_t plist, plist_type type, const void *value, uint64_t length);
+plist_t plist_find_node_by_key(plist_t plist, const char *value);
+plist_t plist_find_node_by_string(plist_t plist, const char *value);
 
 void plist_get_type_and_value(plist_t node, plist_type * type, void *value, uint64_t * length);
 
diff --git a/src/plist.c b/src/plist.c
index 74868cc..709f12d 100644
--- a/src/plist.c
+++ b/src/plist.c
@@ -71,7 +71,7 @@ plist_t plist_new_array()
         return plist_new_node(data);
 }
 
-plist_t plist_add_sub_element(plist_t node, plist_type type, void *value, uint64_t length)
+plist_t plist_add_sub_element(plist_t node, plist_type type, const void *value, uint64_t length)
 {
         //only structured types can have children
         plist_type node_type = plist_get_node_type(node);
@@ -140,7 +140,7 @@ plist_t plist_get_prev_sibling(plist_t node)
         return (plist_t) g_node_prev_sibling((GNode *) node);
 }
 
-static char compare_node_value(plist_type type, plist_data_t data, void *value, uint64_t length)
+static char compare_node_value(plist_type type, plist_data_t data, const void *value, uint64_t length)
 {
         char res = FALSE;
         switch (type) {
@@ -172,7 +172,7 @@ static char compare_node_value(plist_type type, plist_data_t data, void *value,
         return res;
 }
 
-plist_t plist_find_node(plist_t plist, plist_type type, void *value, uint64_t length)
+plist_t plist_find_node(plist_t plist, plist_type type, const void *value, uint64_t length)
 {
         if (!plist)
                 return NULL;
@@ -194,12 +194,12 @@ plist_t plist_find_node(plist_t plist, plist_type type, void *value, uint64_t le
         return NULL;
 }
 
-plist_t plist_find_node_by_key(plist_t plist, char *value)
+plist_t plist_find_node_by_key(plist_t plist, const char *value)
 {
         return plist_find_node(plist, PLIST_KEY, value, strlen(value));
 }
 
-plist_t plist_find_node_by_string(plist_t plist, char *value)
+plist_t plist_find_node_by_string(plist_t plist, const char *value)
 {
         return plist_find_node(plist, PLIST_STRING, value, strlen(value));
 }
@@ -268,12 +268,12 @@ void plist_add_sub_node(plist_t node, plist_t subnode)
         }
 }
 
-void plist_add_sub_key_el(plist_t node, char *val)
+void plist_add_sub_key_el(plist_t node, const char *val)
 {
         plist_add_sub_element(node, PLIST_KEY, val, strlen(val));
 }
 
-void plist_add_sub_string_el(plist_t node, char *val)
+void plist_add_sub_string_el(plist_t node, const char *val)
 {
         plist_add_sub_element(node, PLIST_STRING, val, strlen(val));
 }
@@ -293,7 +293,7 @@ void plist_add_sub_real_el(plist_t node, double val)
         plist_add_sub_element(node, PLIST_REAL, &val, sizeof(double));
 }
 
-void plist_add_sub_data_el(plist_t node, char *val, uint64_t length)
+void plist_add_sub_data_el(plist_t node, const char *val, uint64_t length)
 {
         plist_add_sub_element(node, PLIST_DATA, val, length);
 }