diff --git a/swad_changelog.h b/swad_changelog.h
index b666a050..343fa485 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -355,10 +355,11 @@ En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
 
-#define Log_PLATFORM_VERSION	"SWAD 18.6.2 (2018-10-17)"
+#define Log_PLATFORM_VERSION	"SWAD 18.6.3 (2018-10-17)"
 #define CSS_FILE		"swad18.4.css"
 #define JS_FILE			"swad17.17.1.js"
 /*
+        Version 18.6.3:   Oct 17, 2018  Some sprintf changed by snprintf or asprintf. (235954 lines)
         Version 18.6.2:   Oct 17, 2018  Some sprintf changed by snprintf. (235808 lines)
         Version 18.6.1:   Oct 16, 2018  Some sprintf changed by snprintf. (235755 lines)
         Version 18.6:     Oct 16, 2018  sprintf changed by snprintf in alerts. (235730 lines)
diff --git a/swad_chat.c b/swad_chat.c
index ccb96014..ac55b654 100644
--- a/swad_chat.c
+++ b/swad_chat.c
@@ -144,7 +144,9 @@ void Cht_ShowListOfAvailableChatRooms (void)
    /***** Link to chat available for all the users *****/
    IsLastItemInLevel[1] = (!Gbl.Usrs.Me.IBelongToCurrentCrs &&
                            !Gbl.Usrs.Me.MyDegs.Num);
-   sprintf (ThisRoomFullName,"%s (%s)",Txt_General,Txt_SEX_PLURAL_abc[Usr_SEX_ALL]);
+   snprintf (ThisRoomFullName,sizeof (ThisRoomFullName),
+	     "%s (%s)",
+	     Txt_General,Txt_SEX_PLURAL_abc[Usr_SEX_ALL]);
    Cht_WriteLinkToChat1 ("GBL_USR",Txt_SEX_PLURAL_Abc[Usr_SEX_ALL],ThisRoomFullName,1,IsLastItemInLevel);
    fprintf (Gbl.F.Out,"<img src=\"%s/chat64x64.gif\""
 	              " alt=\"%s\" title=\"%s\""
@@ -158,8 +160,9 @@ void Cht_ShowListOfAvailableChatRooms (void)
    switch (Gbl.Usrs.Me.Role.Logged)
      {
       case Rol_STD:
-         sprintf (ThisRoomFullName,"%s (%s)",
-                  Txt_General,Txt_ROLES_PLURAL_abc[Rol_STD][Usr_SEX_ALL]);
+         snprintf (ThisRoomFullName,sizeof (ThisRoomFullName),
+                   "%s (%s)",
+                   Txt_General,Txt_ROLES_PLURAL_abc[Rol_STD][Usr_SEX_ALL]);
          Cht_WriteLinkToChat1 ("GBL_STD",Txt_ROLES_PLURAL_BRIEF_Abc[Rol_STD],ThisRoomFullName,1,IsLastItemInLevel);
 	 fprintf (Gbl.F.Out,"<img src=\"%s/chat64x64.gif\""
 			    " alt=\"%s\" title=\"%s\""
@@ -170,8 +173,9 @@ void Cht_ShowListOfAvailableChatRooms (void)
          break;
       case Rol_NET:
       case Rol_TCH:
-         sprintf (ThisRoomFullName,"%s (%s)",
-                  Txt_General,Txt_ROLES_PLURAL_abc[Rol_TCH][Usr_SEX_ALL]);
+         snprintf (ThisRoomFullName,sizeof (ThisRoomFullName),
+                   "%s (%s)",
+                   Txt_General,Txt_ROLES_PLURAL_abc[Rol_TCH][Usr_SEX_ALL]);
          Cht_WriteLinkToChat1 ("GBL_TCH",Txt_ROLES_PLURAL_BRIEF_Abc[Rol_TCH],ThisRoomFullName,1,IsLastItemInLevel);
 	 fprintf (Gbl.F.Out,"<img src=\"%s/chat64x64.gif\""
 			    " alt=\"%s\" title=\"%s\""
@@ -196,9 +200,15 @@ void Cht_ShowListOfAvailableChatRooms (void)
 
       /* Link to the room of this degree */
       IsLastItemInLevel[1] = (NumMyDeg == Gbl.Usrs.Me.MyDegs.Num - 1);
-      sprintf (ThisRoomCode,"DEG_%ld",Deg.DegCod);
-      sprintf (ThisRoomShrtName,"%s",Deg.ShrtName);
-      sprintf (ThisRoomFullName,"%s %s",Txt_Degree,Deg.ShrtName);
+      snprintf (ThisRoomCode,sizeof (ThisRoomCode),
+	        "DEG_%ld",
+		Deg.DegCod);
+      snprintf (ThisRoomShrtName,sizeof (ThisRoomShrtName),
+	        "%s",
+		Deg.ShrtName);
+      snprintf (ThisRoomFullName,sizeof (ThisRoomFullName),
+	        "%s %s",
+		Txt_Degree,Deg.ShrtName);
       Cht_WriteLinkToChat1 (ThisRoomCode,ThisRoomShrtName,ThisRoomFullName,1,IsLastItemInLevel);
       Log_DrawLogo (Sco_SCOPE_DEG,Deg.DegCod,Deg.ShrtName,20,NULL,true);
       Cht_WriteLinkToChat2 (ThisRoomCode,ThisRoomFullName);
@@ -220,9 +230,15 @@ void Cht_ShowListOfAvailableChatRooms (void)
 
                /* Link to the room of this course */
                IsLastItemInLevel[2] = (NumRow == NumRows - 1);
-               sprintf (ThisRoomCode,"CRS_%ld",Crs.CrsCod);
-               sprintf (ThisRoomShrtName,"%s",Crs.ShrtName);
-               sprintf (ThisRoomFullName,"%s %s",Txt_Course,Crs.ShrtName);
+               snprintf (ThisRoomCode,sizeof (ThisRoomCode),
+        	         "CRS_%ld",
+			 Crs.CrsCod);
+               snprintf (ThisRoomShrtName,sizeof (ThisRoomShrtName),
+        	         "%s",
+			 Crs.ShrtName);
+               snprintf (ThisRoomFullName,sizeof (ThisRoomFullName),
+        	         "%s %s",
+			 Txt_Course,Crs.ShrtName);
                Cht_WriteLinkToChat1 (ThisRoomCode,ThisRoomShrtName,ThisRoomFullName,2,IsLastItemInLevel);
                fprintf (Gbl.F.Out,"<img src=\"%s/dot64x64.png\""
         	                  " alt=\"%s\" title=\"%s\""
@@ -448,7 +464,9 @@ void Cht_OpenChatWindow (void)
                Usr_MAX_BYTES_FULL_NAME);
 
    /***** Build the lists of available rooms *****/
-   sprintf (ListRoomCodes,"#%s",RoomCode);
+   snprintf (ListRoomCodes,sizeof (ListRoomCodes),
+	     "#%s",
+	     RoomCode);
    Str_Copy (ListRoomShrtNames,RoomShrtName,
              Cht_MAX_BYTES_ROOM_SHRT_NAMES);
    Str_Copy (ListRoomFullNames ,RoomFullName,
@@ -459,12 +477,15 @@ void Cht_OpenChatWindow (void)
       Str_Concat (ListRoomCodes,"|#GBL_USR",
                   Cht_MAX_BYTES_ROOM_CODES);
 
-      sprintf (RoomShrtName,"|%s",Txt_SEX_PLURAL_Abc[Usr_SEX_ALL]);
+      snprintf (RoomShrtName,sizeof (RoomShrtName),
+	        "|%s",
+		Txt_SEX_PLURAL_Abc[Usr_SEX_ALL]);
       Str_Concat (ListRoomShrtNames,RoomShrtName,
                   Cht_MAX_BYTES_ROOM_SHRT_NAMES);
 
-      sprintf (RoomFullName,"|%s (%s)",
-               Txt_General,Txt_SEX_PLURAL_abc[Usr_SEX_ALL]);
+      snprintf (RoomFullName,sizeof (RoomFullName),
+	        "|%s (%s)",
+                Txt_General,Txt_SEX_PLURAL_abc[Usr_SEX_ALL]);
       Str_Concat (ListRoomFullNames,RoomFullName,
                   Cht_MAX_BYTES_ROOM_FULL_NAMES);
      }
@@ -475,12 +496,15 @@ void Cht_OpenChatWindow (void)
          Str_Concat (ListRoomCodes,"|#GBL_STD",
                      Cht_MAX_BYTES_ROOM_CODES);
 
-         sprintf (RoomShrtName,"|%s",Txt_ROLES_PLURAL_BRIEF_Abc[Rol_STD]);
+         snprintf (RoomShrtName,sizeof (RoomShrtName),
+                   "|%s",
+		   Txt_ROLES_PLURAL_BRIEF_Abc[Rol_STD]);
          Str_Concat (ListRoomShrtNames,RoomShrtName,
                      Cht_MAX_BYTES_ROOM_SHRT_NAMES);
 
-         sprintf (RoomFullName,"|%s (%s)",Txt_General,
-                  Txt_ROLES_PLURAL_abc[Rol_STD][Usr_SEX_ALL]);
+         snprintf (RoomFullName,sizeof (RoomFullName),
+                   "|%s (%s)",
+		   Txt_General,Txt_ROLES_PLURAL_abc[Rol_STD][Usr_SEX_ALL]);
 	 Str_Concat (ListRoomFullNames,RoomFullName,
 	             Cht_MAX_BYTES_ROOM_FULL_NAMES);
         }
@@ -492,12 +516,15 @@ void Cht_OpenChatWindow (void)
          Str_Concat (ListRoomCodes,"|#GBL_TCH",
                      Cht_MAX_BYTES_ROOM_CODES);
 
-         sprintf (RoomShrtName,"|%s",Txt_ROLES_PLURAL_BRIEF_Abc[Rol_TCH]);
+         snprintf (RoomShrtName,sizeof (RoomShrtName),
+                   "|%s",
+		   Txt_ROLES_PLURAL_BRIEF_Abc[Rol_TCH]);
          Str_Concat (ListRoomShrtNames,RoomShrtName,
                      Cht_MAX_BYTES_ROOM_SHRT_NAMES);
 
-         sprintf (RoomFullName,"|%s (%s)",
-                  Txt_General,Txt_ROLES_PLURAL_abc[Rol_TCH][Usr_SEX_ALL]);
+         snprintf (RoomFullName,sizeof (RoomFullName),
+                   "|%s (%s)",
+                   Txt_General,Txt_ROLES_PLURAL_abc[Rol_TCH][Usr_SEX_ALL]);
 	 Str_Concat (ListRoomFullNames,RoomFullName,
 	             Cht_MAX_BYTES_ROOM_FULL_NAMES);
         }
@@ -506,7 +533,9 @@ void Cht_OpenChatWindow (void)
 	NumMyDeg < Gbl.Usrs.Me.MyDegs.Num;
 	NumMyDeg++)
      {
-      sprintf (ThisRoomCode,"DEG_%ld",Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].DegCod);
+      snprintf (ThisRoomCode,sizeof (ThisRoomCode),
+	        "DEG_%ld",
+		Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].DegCod);
       if (strcmp (RoomCode,ThisRoomCode))
         {
          Str_Concat (ListRoomCodes,"|#",
@@ -518,13 +547,17 @@ void Cht_OpenChatWindow (void)
          Deg.DegCod = Gbl.Usrs.Me.MyDegs.Degs[NumMyDeg].DegCod;
          Deg_GetDataOfDegreeByCod (&Deg);
 
-         sprintf (ThisRoomShortName,"%s",Deg.ShrtName);
+         snprintf (ThisRoomShortName,sizeof (ThisRoomShortName),
+                   "%s",
+		   Deg.ShrtName);
          Str_Concat (ListRoomShrtNames,"|",
                      Cht_MAX_BYTES_ROOM_SHRT_NAMES);
          Str_Concat (ListRoomShrtNames,ThisRoomShortName,
                      Cht_MAX_BYTES_ROOM_SHRT_NAMES);
 
-         sprintf (ThisRoomFullName,"%s %s",Txt_Degree,Deg.ShrtName);
+         snprintf (ThisRoomFullName,sizeof (ThisRoomFullName),
+                   "%s %s",
+		   Txt_Degree,Deg.ShrtName);
          Str_Concat (ListRoomFullNames,"|",
                      Cht_MAX_BYTES_ROOM_FULL_NAMES);
          Str_Concat (ListRoomFullNames,ThisRoomFullName,
@@ -536,7 +569,9 @@ void Cht_OpenChatWindow (void)
 	NumMyCrs < Gbl.Usrs.Me.MyCrss.Num;
 	NumMyCrs++)
      {
-      sprintf (ThisRoomCode,"CRS_%ld",Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].CrsCod);
+      snprintf (ThisRoomCode,sizeof (ThisRoomCode),
+	        "CRS_%ld",
+		Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].CrsCod);
       if (strcmp (RoomCode,ThisRoomCode))
         {
          Str_Concat (ListRoomCodes,"|#",
@@ -548,13 +583,17 @@ void Cht_OpenChatWindow (void)
          Crs.CrsCod = Gbl.Usrs.Me.MyCrss.Crss[NumMyCrs].CrsCod;
          Crs_GetDataOfCourseByCod (&Crs);
 
-         sprintf (ThisRoomShortName,"%s",Crs.ShrtName);
+         snprintf (ThisRoomShortName,sizeof (ThisRoomShortName),
+                   "%s",
+		   Crs.ShrtName);
          Str_Concat (ListRoomShrtNames,"|",
                      Cht_MAX_BYTES_ROOM_SHRT_NAMES);
          Str_Concat (ListRoomShrtNames,ThisRoomShortName,
                      Cht_MAX_BYTES_ROOM_SHRT_NAMES);
 
-         sprintf (ThisRoomFullName,"%s %s",Txt_Course,Crs.ShrtName);
+         snprintf (ThisRoomFullName,sizeof (ThisRoomFullName),
+                   "%s %s",
+		   Txt_Course,Crs.ShrtName);
          Str_Concat (ListRoomFullNames,"|",
                      Cht_MAX_BYTES_ROOM_FULL_NAMES);
          Str_Concat (ListRoomFullNames,ThisRoomFullName,
diff --git a/swad_config.h b/swad_config.h
index 43a4ed32..97907c56 100644
--- a/swad_config.h
+++ b/swad_config.h
@@ -28,9 +28,9 @@
 /** Uncomment one of the following installations of SWAD or create your own **/
 /*****************************************************************************/
 
-//#define LOCALHOST_UBUNTU	// Comment this line if not applicable
+#define LOCALHOST_UBUNTU	// Comment this line if not applicable
 //#define OPENSWAD_ORG		// Comment this line if not applicable
-#define SWAD_UGR_ES		// Comment this line if not applicable
+//#define SWAD_UGR_ES		// Comment this line if not applicable
 //#define SWADBERRY_UGR_ES	// Comment this line if not applicable
 
 /*****************************************************************************/
diff --git a/swad_connected.c b/swad_connected.c
index c483a917..0ce282e2 100644
--- a/swad_connected.c
+++ b/swad_connected.c
@@ -97,8 +97,10 @@ void Con_ShowConnectedUsrs (void)
 
    /***** Start box *****/
    /* Current time */
-   sprintf (Gbl.Title,"%s<div id=\"connected_current_time\"></div>",
-	    Txt_Connected_users);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     "%s"
+	     "<div id=\"connected_current_time\"></div>",
+	     Txt_Connected_users);
    Box_StartBox (NULL,Gbl.Title,Con_PutIconToUpdateConnected,
 		 Hlp_USERS_Connected,Box_NOT_CLOSABLE);
    fprintf (Gbl.F.Out,"<script type=\"text/javascript\">"
diff --git a/swad_convert_briefcases.c b/swad_convert_briefcases.c
index 9e3709f2..84d5aa8d 100644
--- a/swad_convert_briefcases.c
+++ b/swad_convert_briefcases.c
@@ -52,17 +52,20 @@ int main (void)
    char OldPathUsr[PATH_MAX + 1];
    char Command[1024 + PATH_MAX * 2];
 
-   sprintf (Command,"mv %s/%s %s/%s_backup",
-	    PATH_SWAD_PRIVATE,FOLDER_USR,
-	    PATH_SWAD_PRIVATE,FOLDER_USR);
+   snprintf (Command,sizeof (Command),
+	     "mv %s/%s %s/%s_backup",
+	     PATH_SWAD_PRIVATE,FOLDER_USR,
+	     PATH_SWAD_PRIVATE,FOLDER_USR);
    ExecuteCommand (Command);
-   sprintf (Command,"mkdir %s/%s",
-	    PATH_SWAD_PRIVATE,FOLDER_USR);
+   snprintf (Command,sizeof (Command),
+	     "mkdir %s/%s",
+	     PATH_SWAD_PRIVATE,FOLDER_USR);
    ExecuteCommand (Command);
    for (i=0; i<100; i++)
      {
-      sprintf (Command,"mkdir %s/%s/%02u",
-	       PATH_SWAD_PRIVATE,FOLDER_USR,i);
+      snprintf (Command,sizeof (Command),
+	        "mkdir %s/%s/%02u",
+	        PATH_SWAD_PRIVATE,FOLDER_USR,i);
       ExecuteCommand (Command);
      }
 
@@ -98,13 +101,15 @@ int main (void)
 		    {
                      Str_Copy (UsrID,row[1],
                                ID_MAX_BYTES_USR_ID);	// UsrID
-                     sprintf (OldPathUsr,"%s/%s_backup/%c/%s",
-                	      PATH_SWAD_PRIVATE,FOLDER_USR,UsrID[strlen (UsrID)-1],UsrID);
+                     snprintf (OldPathUsr,sizeof (OldPathUsr),
+                	       "%s/%s_backup/%c/%s",
+                	       PATH_SWAD_PRIVATE,FOLDER_USR,UsrID[strlen (UsrID)-1],UsrID);
                      if (CheckIfPathExists (OldPathUsr))
                        {
-                        sprintf (Command,"mv %s %s/%s/%02u/%ld",
-                	         OldPathUsr,
-                	         PATH_SWAD_PRIVATE,FOLDER_USR,(unsigned) (UsrCod % 100),UsrCod);
+                        snprintf (Command,sizeof (Command),
+                                  "mv %s %s/%s/%02u/%ld",
+                	          OldPathUsr,
+                	          PATH_SWAD_PRIVATE,FOLDER_USR,(unsigned) (UsrCod % 100),UsrCod);
                         ExecuteCommand (Command);
                         NumUsrs++;
                        }
@@ -112,9 +117,10 @@ int main (void)
 	}
      }
    mysql_free_result (mysql_res);
-   sprintf (Command,"chown -R %s:%s %s/%s",
-	    WEB_USER,WEB_USER,
-	    PATH_SWAD_PRIVATE,FOLDER_USR);
+   snprintf (Command,sizeof (Command),
+	     "chown -R %s:%s %s/%s",
+	     WEB_USER,WEB_USER,
+	     PATH_SWAD_PRIVATE,FOLDER_USR);
    ExecuteCommand (Command);
 
    printf ("# Rows : %u\n"
diff --git a/swad_convert_photos.c b/swad_convert_photos.c
index c7c9e049..dff23a2d 100644
--- a/swad_convert_photos.c
+++ b/swad_convert_photos.c
@@ -53,17 +53,20 @@ int main (void)
    char OldPathPhoto[PATH_MAX + 1];
    char Command[1024 + PATH_MAX * 2];
 
-   sprintf (Command,"mv %s/%s %s/%s_backup",
-	    PATH_SWAD_PRIVATE,FOLDER_PHOTO,
-	    PATH_SWAD_PRIVATE,FOLDER_PHOTO);
+   snprintf (Command,sizeof (Command),
+	     "mv %s/%s %s/%s_backup",
+	     PATH_SWAD_PRIVATE,FOLDER_PHOTO,
+	     PATH_SWAD_PRIVATE,FOLDER_PHOTO);
    ExecuteCommand (Command);
-   sprintf (Command,"mkdir %s/%s",
-	    PATH_SWAD_PRIVATE,FOLDER_PHOTO);
+   snprintf (Command,sizeof (Command),
+	     "mkdir %s/%s",
+	     PATH_SWAD_PRIVATE,FOLDER_PHOTO);
    ExecuteCommand (Command);
    for (i=0; i<100; i++)
      {
-      sprintf (Command,"mkdir %s/%s/%02u",
-	       PATH_SWAD_PRIVATE,FOLDER_PHOTO,i);
+      snprintf (Command,sizeof (Command),
+	        "mkdir %s/%s/%02u",
+	        PATH_SWAD_PRIVATE,FOLDER_PHOTO,i);
       ExecuteCommand (Command);
      }
 
@@ -99,23 +102,27 @@ int main (void)
 		    {
                      Str_Copy (UsrID,row[1],
                                ID_MAX_BYTES_USR_ID);	// UsrID
-                     sprintf (OldPathPhoto,"%s/%s_backup/%s_original.jpg",
-                	      PATH_SWAD_PRIVATE,FOLDER_PHOTO,UsrID);
+                     snprintf (OldPathPhoto,sizeof (OldPathPhoto),
+                	       "%s/%s_backup/%s_original.jpg",
+                	       PATH_SWAD_PRIVATE,FOLDER_PHOTO,UsrID);
                      if (CheckIfPathExists (OldPathPhoto))
                        {
-                        sprintf (Command,"cp -a %s %s/%s/%02u/%ld_original.jpg",
-                	         OldPathPhoto,
-                	         PATH_SWAD_PRIVATE,FOLDER_PHOTO,(unsigned) (UsrCod % 100),UsrCod);
+                        snprintf (Command,sizeof (Command),
+                                  "cp -a %s %s/%s/%02u/%ld_original.jpg",
+                	          OldPathPhoto,
+                	          PATH_SWAD_PRIVATE,FOLDER_PHOTO,(unsigned) (UsrCod % 100),UsrCod);
                         ExecuteCommand (Command);
                        }
 
-                     sprintf (OldPathPhoto,"%s/%s_backup/%s.jpg",
-                	      PATH_SWAD_PRIVATE,FOLDER_PHOTO,UsrID);
+                     snprintf (OldPathPhoto,sizeof (OldPathPhoto),
+                	       "%s/%s_backup/%s.jpg",
+                	       PATH_SWAD_PRIVATE,FOLDER_PHOTO,UsrID);
                      if (CheckIfPathExists (OldPathPhoto))
                        {
-                        sprintf (Command,"cp -a %s %s/%s/%02u/%ld.jpg",
-                	         OldPathPhoto,
-                	         PATH_SWAD_PRIVATE,FOLDER_PHOTO,(unsigned) (UsrCod % 100),UsrCod);
+                        snprintf (Command,sizeof (Command),
+                                  "cp -a %s %s/%s/%02u/%ld.jpg",
+                	          OldPathPhoto,
+                	          PATH_SWAD_PRIVATE,FOLDER_PHOTO,(unsigned) (UsrCod % 100),UsrCod);
                         ExecuteCommand (Command);
                         NumPhotos++;
                        }
@@ -123,13 +130,15 @@ int main (void)
 	}
      }
    mysql_free_result (mysql_res);
-   sprintf (Command,"chown -R %s:%s %s/%s",
-	    WEB_USER,WEB_USER,
-	    PATH_SWAD_PRIVATE,FOLDER_PHOTO);
+   snprintf (Command,sizeof (Command),
+	     "chown -R %s:%s %s/%s",
+	     WEB_USER,WEB_USER,
+	     PATH_SWAD_PRIVATE,FOLDER_PHOTO);
    ExecuteCommand (Command);
 
-   sprintf (Command,"rm -f %s/%s/*.jpg",
-	    PATH_SWAD_PUBLIC,FOLDER_PHOTO);
+   snprintf (Command,sizeof (Command),
+	     "rm -f %s/%s/*.jpg",
+	     PATH_SWAD_PUBLIC,FOLDER_PHOTO);
    ExecuteCommand (Command);
 
    printf ("# Rows : %u\n"
diff --git a/swad_convert_works.c b/swad_convert_works.c
index e5ba770e..4b5a7ca4 100644
--- a/swad_convert_works.c
+++ b/swad_convert_works.c
@@ -82,21 +82,28 @@ int main (void)
      }
    if ((NumCrss = (unsigned) mysql_num_rows (mysql_res_crs)))
      {
-      for (NumCrs=0; NumCrs<NumCrss; NumCrs++)
+      for (NumCrs = 0;
+	   NumCrs < NumCrss;
+	   NumCrs++)
 	{
 	 row = mysql_fetch_row (mysql_res_crs);
 	 if (row[0])
 	    if (row[0][0])
 	       if (sscanf (row[0],"%ld",&CrsCod) == 1)	// CrsCod
 		 {
-		  sprintf (OldPathUsrs,"%s/%s/%ld/%s",
-			   PATH_SWAD_PRIVATE,FOLDER_CRS,CrsCod,FOLDER_USR);
+		  snprintf (OldPathUsrs,sizeof (OldPathUsrs),
+			    "%s/%s/%ld/%s",
+			    PATH_SWAD_PRIVATE,FOLDER_CRS,CrsCod,FOLDER_USR);
 		  if (CheckIfPathExists (OldPathUsrs))
 		    {
-		     sprintf (Command,"mv %s %s_backup",OldPathUsrs,OldPathUsrs);
+		     snprintf (Command,sizeof (Command),
+			       "mv %s %s_backup",
+			       OldPathUsrs,OldPathUsrs);
 		     ExecuteCommand (Command);
 
-		     sprintf (Command,"mkdir %s",OldPathUsrs);
+		     snprintf (Command,sizeof (Command),
+			       "mkdir %s",
+			       OldPathUsrs);
 		     ExecuteCommand (Command);
 
 		     sprintf (Query,"SELECT usr_IDs.UsrCod,usr_IDs.UsrID"
@@ -128,27 +135,38 @@ int main (void)
 				      {
 				       Str_Copy (UsrID,row[1],
 				                 ID_MAX_BYTES_USR_ID,62);	// UsrID
-				       sprintf (OldPathUsr,"%s_backup/%s",OldPathUsrs,UsrID);
+				       snprintf (OldPathUsr,sizeof (OldPathUsr),
+					         "%s_backup/%s",
+						 OldPathUsrs,UsrID);
 				       if (CheckIfPathExists (OldPathUsr))
 					 {
-					  sprintf (Path02u,"%s/%02u",
-						   OldPathUsrs,(unsigned) (UsrCod % 100));
+					  snprintf (Path02u,sizeof (Path02u),
+						    "%s/%02u",
+						    OldPathUsrs,(unsigned) (UsrCod % 100));
 					  if (!CheckIfPathExists (Path02u))
 					    {
-					     sprintf (Command,"mkdir %s",Path02u);
+					     snprintf (Command,sizeof (Command),
+						       "mkdir %s",
+						       Path02u);
 					     ExecuteCommand (Command);
 					    }
-					  sprintf (Command,"mv %s %s/%ld",OldPathUsr,Path02u,UsrCod);
+					  snprintf (Command,sizeof (Command),
+						    "mv %s %s/%ld",
+						    OldPathUsr,Path02u,UsrCod);
 					  ExecuteCommand (Command);
 					 }
 				      }
 		          }
 			mysql_free_result (mysql_res_usr);
 		       }
-		     sprintf (Command,"chown -R %s:%s %s",WEB_USER,WEB_USER,OldPathUsrs);
+		     snprintf (Command,sizeof (Command),
+			       "chown -R %s:%s %s",
+			       WEB_USER,WEB_USER,OldPathUsrs);
 		     ExecuteCommand (Command);
 /*
-		     sprintf (Command,"rm -Rf %s_backup",OldPathUsrs);
+		     snprintf (Command,sizeof (Command),
+		               "rm -Rf %s_backup",
+		               OldPathUsrs);
 		     ExecuteCommand (Command);
 */
 		     printf ("\n");
diff --git a/swad_country.c b/swad_country.c
index 7c367f10..96863779 100644
--- a/swad_country.c
+++ b/swad_country.c
@@ -385,8 +385,9 @@ static void Cty_Configuration (bool PrintView)
 	 /* Form to go to see institutions of this country */
 	 Act_StartFormGoTo (ActSeeIns);
 	 Cty_PutParamCtyCod (Gbl.CurrentCty.Cty.CtyCod);
-	 sprintf (Gbl.Title,Txt_Institutions_of_COUNTRY_X,
-	          Gbl.CurrentCty.Cty.Name[Gbl.Prefs.Language]);
+	 snprintf (Gbl.Title,sizeof (Gbl.Title),
+	           Txt_Institutions_of_COUNTRY_X,
+	           Gbl.CurrentCty.Cty.Name[Gbl.Prefs.Language]);
 	 Act_LinkFormSubmit (Gbl.Title,"DAT",NULL);
 	 fprintf (Gbl.F.Out,"%u</a>",
 		  Ins_GetNumInssInCty (Gbl.CurrentCty.Cty.CtyCod));
@@ -803,7 +804,9 @@ void Cty_DrawCountryMapAndNameWithLink (struct Country *Cty,Act_Action_t Action,
    fprintf (Gbl.F.Out,"<div class=\"%s\">",ClassContainer);
 
    /***** Link to action *****/
-   sprintf (Gbl.Title,Txt_Go_to_X,Cty->Name[Gbl.Prefs.Language]);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     Txt_Go_to_X,
+	     Cty->Name[Gbl.Prefs.Language]);
    Act_LinkFormSubmit (Gbl.Title,ClassLink,NULL);
 
    /***** Draw country map *****/
@@ -852,12 +855,13 @@ bool Cty_CheckIfCountryMapExists (struct Country *Cty)
   {
    char PathMap[PATH_MAX + 1];
 
-   sprintf (PathMap,"%s/%s/%s/%s/%s.png",
-	    Cfg_PATH_SWAD_PUBLIC,
-	    Cfg_FOLDER_PUBLIC_ICON,
-	    Cfg_ICON_FOLDER_COUNTRIES,
-	    Cty->Alpha2,
-	    Cty->Alpha2);
+   snprintf (PathMap,sizeof (PathMap),
+	     "%s/%s/%s/%s/%s.png",
+	     Cfg_PATH_SWAD_PUBLIC,
+	     Cfg_FOLDER_PUBLIC_ICON,
+	     Cfg_ICON_FOLDER_COUNTRIES,
+	     Cty->Alpha2,
+	     Cty->Alpha2);
    return Fil_CheckIfPathExists (PathMap);
   }
 
@@ -1015,21 +1019,25 @@ void Cty_GetListCountries (Cty_GetExtraData_t GetExtraData)
               Lan <= Txt_NUM_LANGUAGES;
               Lan++)
            {
-            sprintf (StrField,"countries.Name_%s,",
-        	     Txt_STR_LANG_ID[Lan]);
+            snprintf (StrField,sizeof (StrField),
+        	      "countries.Name_%s,",
+        	      Txt_STR_LANG_ID[Lan]);
             Str_Concat (SubQueryNam1,StrField,
                         Cty_MAX_BYTES_SUBQUERY_CTYS);
-            sprintf (StrField,"Name_%s,",
-        	     Txt_STR_LANG_ID[Lan]);
+            snprintf (StrField,sizeof (StrField),
+        	      "Name_%s,",
+        	      Txt_STR_LANG_ID[Lan]);
             Str_Concat (SubQueryNam2,StrField,
                         Cty_MAX_BYTES_SUBQUERY_CTYS);
 
-            sprintf (StrField,"countries.WWW_%s,",
-        	     Txt_STR_LANG_ID[Lan]);
+            snprintf (StrField,sizeof (StrField),
+        	      "countries.WWW_%s,",
+        	      Txt_STR_LANG_ID[Lan]);
             Str_Concat (SubQueryWWW1,StrField,
                         Cty_MAX_BYTES_SUBQUERY_CTYS);
-            sprintf (StrField,"WWW_%s,",
-        	     Txt_STR_LANG_ID[Lan]);
+            snprintf (StrField,sizeof (StrField),
+        	      "WWW_%s,",
+        	      Txt_STR_LANG_ID[Lan]);
             Str_Concat (SubQueryWWW2,StrField,
                         Cty_MAX_BYTES_SUBQUERY_CTYS);
            }
@@ -1311,17 +1319,25 @@ bool Cty_GetDataOfCountryByCod (struct Country *Cty,Cty_GetExtraData_t GetExtraD
 	      Lan <= Txt_NUM_LANGUAGES;
 	      Lan++)
 	   {
-	    sprintf (StrField,"countries.Name_%s,",Txt_STR_LANG_ID[Lan]);
+	    snprintf (StrField,sizeof (StrField),
+		      "countries.Name_%s,",
+		      Txt_STR_LANG_ID[Lan]);
 	    Str_Concat (SubQueryNam1,StrField,
 	                Cty_MAX_BYTES_SUBQUERY_CTYS);
-	    sprintf (StrField,"Name_%s,",Txt_STR_LANG_ID[Lan]);
+	    snprintf (StrField,sizeof (StrField),
+		      "Name_%s,",
+		      Txt_STR_LANG_ID[Lan]);
 	    Str_Concat (SubQueryNam2,StrField,
 	                Cty_MAX_BYTES_SUBQUERY_CTYS);
 
-	    sprintf (StrField,"countries.WWW_%s,",Txt_STR_LANG_ID[Lan]);
+	    snprintf (StrField,sizeof (StrField),
+		      "countries.WWW_%s,",
+		      Txt_STR_LANG_ID[Lan]);
 	    Str_Concat (SubQueryWWW1,StrField,
 	                Cty_MAX_BYTES_SUBQUERY_CTYS);
-	    sprintf (StrField,"WWW_%s,",Txt_STR_LANG_ID[Lan]);
+	    snprintf (StrField,sizeof (StrField),
+		      "WWW_%s,",
+		      Txt_STR_LANG_ID[Lan]);
 	    Str_Concat (SubQueryWWW2,StrField,
 	                Cty_MAX_BYTES_SUBQUERY_CTYS);
 	   }
@@ -1773,7 +1789,9 @@ void Cty_RenameCountry (void)
 	 else
 	   {
 	    /* Update the table changing old name by new name */
-	    sprintf (FieldName,"Name_%s",Txt_STR_LANG_ID[Language]);
+	    snprintf (FieldName,sizeof (FieldName),
+		      "Name_%s",
+		      Txt_STR_LANG_ID[Language]);
 	    Cty_UpdateCtyNameDB (Cty->CtyCod,FieldName,NewCtyName);
 
 	    /* Write message to show the change made */
@@ -2149,7 +2167,9 @@ void Cty_RecFormNewCountry (void)
         	 Lan <= Txt_NUM_LANGUAGES;
         	 Lan++)
               {
-               sprintf (ParamName,"Name_%s",Txt_STR_LANG_ID[Lan]);
+               snprintf (ParamName,sizeof (ParamName),
+        	         "Name_%s",
+			 Txt_STR_LANG_ID[Lan]);
                Par_GetParToText (ParamName,Cty->Name[Lan],Cty_MAX_BYTES_NAME);
 
                if (Cty->Name[Lan][0])	// If there's a country name
@@ -2172,7 +2192,9 @@ void Cty_RecFormNewCountry (void)
                   break;
                  }
 
-               sprintf (ParamName,"WWW_%s",Txt_STR_LANG_ID[Lan]);
+               snprintf (ParamName,sizeof (ParamName),
+        	         "WWW_%s",
+			 Txt_STR_LANG_ID[Lan]);
                Par_GetParToText (ParamName,Cty->WWW[Lan],Cns_MAX_BYTES_WWW);
               }
            }
@@ -2218,7 +2240,9 @@ static void Cty_CreateCountry (struct Country *Cty)
 	Lan <= Txt_NUM_LANGUAGES;
 	Lan++)
      {
-      sprintf (StrField,",Name_%s",Txt_STR_LANG_ID[Lan]);
+      snprintf (StrField,sizeof (StrField),
+	        ",Name_%s",
+		Txt_STR_LANG_ID[Lan]);
       Str_Concat (SubQueryNam1,StrField,
                   Cty_MAX_BYTES_SUBQUERY_CTYS);
 
@@ -2229,7 +2253,9 @@ static void Cty_CreateCountry (struct Country *Cty)
       Str_Concat (SubQueryNam2,"'",
                   Cty_MAX_BYTES_SUBQUERY_CTYS_NAME);
 
-      sprintf (StrField,",WWW_%s",Txt_STR_LANG_ID[Lan]);
+      snprintf (StrField,sizeof (StrField),
+	        ",WWW_%s",
+		Txt_STR_LANG_ID[Lan]);
       Str_Concat (SubQueryWWW1,StrField,
                   Cty_MAX_BYTES_SUBQUERY_CTYS);
 
@@ -2379,9 +2405,10 @@ unsigned Cty_ListCtysFound (const char *Query)
      {
       /***** Start box and table *****/
       /* Number of countries found */
-      sprintf (Gbl.Title,"%u %s",
-               NumCtys,NumCtys == 1 ? Txt_country :
-				      Txt_countries);
+      snprintf (Gbl.Title,sizeof (Gbl.Title),
+	        "%u %s",
+                NumCtys,NumCtys == 1 ? Txt_country :
+				       Txt_countries);
       Box_StartBoxTable (NULL,Gbl.Title,NULL,
                          NULL,Box_NOT_CLOSABLE,2);
 
diff --git a/swad_course.c b/swad_course.c
index 82cc571e..445480b1 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -448,8 +448,10 @@ static void Crs_Configuration (bool PrintView)
                The_ClassForm[Gbl.Prefs.Theme],
                Txt_Indicators);
       Act_StartForm (ActReqStaCrs);
-      sprintf (Gbl.Title,"%u %s %u",
-               Indicators.NumIndicators,Txt_of_PART_OF_A_TOTAL,Ind_NUM_INDICATORS);
+      snprintf (Gbl.Title,sizeof (Gbl.Title),
+	        "%u %s %u",
+                Indicators.NumIndicators,
+		Txt_of_PART_OF_A_TOTAL,Ind_NUM_INDICATORS);
       Act_LinkFormSubmit (Gbl.Title,"DAT",NULL);
       fprintf (Gbl.F.Out,"%s "
                          "<img src=\"%s/%s\" alt=\"%s\""
@@ -544,7 +546,9 @@ static void Crs_WriteListMyCoursesToSelectOne (void)
    char ClassHighlight[64];
 
    ClassNormal = The_ClassForm[Gbl.Prefs.Theme];
-   sprintf (ClassHighlight,"%s LIGHT_BLUE",The_ClassFormDark[Gbl.Prefs.Theme]);
+   snprintf (ClassHighlight,sizeof (ClassHighlight),
+	     "%s LIGHT_BLUE",
+	     The_ClassFormDark[Gbl.Prefs.Theme]);
 
    /***** Start box *****/
    Box_StartBox (NULL,Txt_My_courses,Crs_PutIconToSearchCourses,
@@ -734,7 +738,9 @@ static void Crs_WriteListMyCoursesToSelectOne (void)
 		  Lay_IndentDependingOnLevel (5,IsLastItemInLevel);
                   Act_StartForm (ActMyCrs);
 		  Crs_PutParamCrsCod (Crs.CrsCod);
-		  sprintf (Gbl.Title,Txt_Go_to_X,Crs.ShrtName);
+		  snprintf (Gbl.Title,sizeof (Gbl.Title),
+			    Txt_Go_to_X,
+			    Crs.ShrtName);
 		  Act_LinkFormSubmit (Gbl.Title,
 		                      Highlight ? ClassHighlight :
         	                                  ClassNormal,NULL);
@@ -1135,7 +1141,9 @@ static void Crs_ListCourses (void)
    unsigned Year;
 
    /***** Start box *****/
-   sprintf (Gbl.Title,Txt_Courses_of_DEGREE_X,Gbl.CurrentDeg.Deg.ShrtName);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     Txt_Courses_of_DEGREE_X,
+	     Gbl.CurrentDeg.Deg.ShrtName);
    Box_StartBox (NULL,Gbl.Title,Crs_PutIconsListCourses,
                  Hlp_DEGREE_Courses,Box_NOT_CLOSABLE);
 
@@ -1284,7 +1292,9 @@ static bool Crs_ListCoursesOfAYearForSeeing (unsigned Year)
 		  TxtClassStrong,BgColor);
 	 Act_StartFormGoTo (ActSeeCrsInf);
 	 Crs_PutParamCrsCod (Crs->CrsCod);
-	 sprintf (Gbl.Title,Txt_Go_to_X,Crs->FullName);
+	 snprintf (Gbl.Title,sizeof (Gbl.Title),
+	           Txt_Go_to_X,
+		   Crs->FullName);
 	 Act_LinkFormSubmit (Gbl.Title,TxtClassStrong,NULL);
 	 fprintf (Gbl.F.Out,"%s</a>",
 		  Crs->FullName);
@@ -2274,11 +2284,13 @@ static void Crs_EmptyCourseCompletely (long CrsCod)
       DB_QueryDELETE (Query,"can not remove users from a course");
 
       /***** Remove directories of the course *****/
-      sprintf (PathRelCrs,"%s/%s/%ld",
-	       Cfg_PATH_SWAD_PRIVATE,Cfg_FOLDER_CRS,CrsCod);
+      snprintf (PathRelCrs,sizeof (PathRelCrs),
+	        "%s/%s/%ld",
+	        Cfg_PATH_SWAD_PRIVATE,Cfg_FOLDER_CRS,CrsCod);
       Fil_RemoveTree (PathRelCrs);
-      sprintf (PathRelCrs,"%s/%s/%ld",
-	       Cfg_PATH_SWAD_PUBLIC,Cfg_FOLDER_CRS,CrsCod);
+      snprintf (PathRelCrs,sizeof (PathRelCrs),
+	        "%s/%s/%ld",
+	        Cfg_PATH_SWAD_PUBLIC,Cfg_FOLDER_CRS,CrsCod);
       Fil_RemoveTree (PathRelCrs);
      }
   }
@@ -2881,7 +2893,9 @@ static void Crs_PutButtonToGoToCrs (void)
      {
       Act_StartForm (ActSeeCrsInf);
       Crs_PutParamCrsCod (Gbl.Degs.EditingCrs.CrsCod);
-      sprintf (Gbl.Title,Txt_Go_to_X,Gbl.Degs.EditingCrs.ShrtName);
+      snprintf (Gbl.Title,sizeof (Gbl.Title),
+	        Txt_Go_to_X,
+		Gbl.Degs.EditingCrs.ShrtName);
       Btn_PutConfirmButton (Gbl.Title);
       Act_EndForm ();
      }
@@ -2901,7 +2915,9 @@ static void Crs_PutButtonToRegisterInCrs (void)
    // If the course beeing edited is different to the current one...
    if (Gbl.Degs.EditingCrs.CrsCod != Gbl.CurrentCrs.Crs.CrsCod)
       Crs_PutParamCrsCod (Gbl.Degs.EditingCrs.CrsCod);
-   sprintf (Gbl.Title,Txt_Register_me_in_X,Gbl.Degs.EditingCrs.ShrtName);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     Txt_Register_me_in_X,
+	     Gbl.Degs.EditingCrs.ShrtName);
    Btn_PutCreateButton (Gbl.Title);
    Act_EndForm ();
   }
@@ -3075,9 +3091,10 @@ void Crs_GetAndWriteCrssOfAUsr (const struct UsrData *UsrDat,Rol_Role_t Role)
                          NULL,Box_NOT_CLOSABLE,2);
 
       /* Heading row */
-      sprintf (Gbl.Title,Txt_USER_in_COURSE,
-               Role == Rol_UNK ? Txt_User[Usr_SEX_UNKNOWN] : // Role == Rol_UNK ==> any role
-        	                     Txt_ROLES_SINGUL_Abc[Role][UsrDat->Sex]);
+      snprintf (Gbl.Title,sizeof (Gbl.Title),
+	        Txt_USER_in_COURSE,
+                Role == Rol_UNK ? Txt_User[Usr_SEX_UNKNOWN] : // Role == Rol_UNK ==> any role
+        	                  Txt_ROLES_SINGUL_Abc[Role][UsrDat->Sex]);
       fprintf (Gbl.F.Out,"<tr>"
                          "<th colspan=\"7\" class=\"LEFT_MIDDLE\">%s:</th>"
                          "</tr>"
@@ -3153,9 +3170,10 @@ unsigned Crs_ListCrssFound (const char *Query)
      {
       /***** Start box and table *****/
       /* Number of courses found */
-      sprintf (Gbl.Title,"%u %s",
-               NumCrss,(NumCrss == 1) ? Txt_course :
-	                                Txt_courses);
+      snprintf (Gbl.Title,sizeof (Gbl.Title),
+	        "%u %s",
+                NumCrss,(NumCrss == 1) ? Txt_course :
+	                                 Txt_courses);
       Box_StartBoxTable (NULL,Gbl.Title,NULL,
                          NULL,Box_NOT_CLOSABLE,2);
 
@@ -3298,7 +3316,9 @@ static void Crs_WriteRowCrsData (unsigned NumCrs,MYSQL_ROW row,bool WriteColumnA
             StyleNoBR,BgColor);
    Act_StartFormGoTo (ActSeeDegInf);
    Deg_PutParamDegCod (Deg.DegCod);
-   sprintf (Gbl.Title,Txt_Go_to_X,row[2]);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     Txt_Go_to_X,
+	     row[2]);
    Act_LinkFormSubmit (Gbl.Title,StyleNoBR,NULL);
    Log_DrawLogo (Sco_SCOPE_DEG,Deg.DegCod,Deg.ShrtName,20,"CENTER_TOP",true);
    fprintf (Gbl.F.Out," %s (%s)"
@@ -3318,7 +3338,9 @@ static void Crs_WriteRowCrsData (unsigned NumCrs,MYSQL_ROW row,bool WriteColumnA
             Style,BgColor);
    Act_StartFormGoTo (ActSeeCrsInf);
    Crs_PutParamCrsCod (CrsCod);
-   sprintf (Gbl.Title,Txt_Go_to_X,row[6]);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     Txt_Go_to_X,
+	     row[6]);
    Act_LinkFormSubmit (Gbl.Title,Style,NULL);
    fprintf (Gbl.F.Out,"%s</a>",row[5]);
    Act_EndForm ();
diff --git a/swad_cryptography.c b/swad_cryptography.c
index 53beffb4..89b3dafa 100644
--- a/swad_cryptography.c
+++ b/swad_cryptography.c
@@ -149,7 +149,8 @@ void Cry_CreateUniqueNameEncrypted (char UniqueNameEncrypted[Cry_BYTES_ENCRYPTED
    char UniqueNamePlain[Cns_MAX_BYTES_IP + 1 + 10 + 1 + 10 + 1 + 10 + 1];
 
    NumCall++;
-   sprintf (UniqueNamePlain,"%s-%lx-%x-%x",
-            Gbl.IP,Gbl.StartExecutionTimeUTC,Gbl.PID,NumCall);
+   snprintf (UniqueNamePlain,sizeof (UniqueNamePlain),
+	     "%s-%lx-%x-%x",
+             Gbl.IP,Gbl.StartExecutionTimeUTC,Gbl.PID,NumCall);
    Cry_EncryptSHA256Base64 (UniqueNamePlain,UniqueNameEncrypted);	// Make difficult to guess a unique name
   }
diff --git a/swad_database.c b/swad_database.c
index c27dc7eb..5bbf6e67 100644
--- a/swad_database.c
+++ b/swad_database.c
@@ -3195,9 +3195,10 @@ void DB_FreeMySQLResult (MYSQL_RES **mysql_res)
 
 void DB_ExitOnMySQLError (const char *Message)
   {
-   char BigErrorMsg[1024 * 1024];
+   char BigErrorMsg[64 * 1024];
 
-   sprintf (BigErrorMsg,"Database error: %s (%s).",
-            Message,mysql_error (&Gbl.mysql));
+   snprintf (BigErrorMsg,sizeof (BigErrorMsg),
+	     "Database error: %s (%s).",
+             Message,mysql_error (&Gbl.mysql));
    Lay_ShowErrorAndExit (BigErrorMsg);
   }
diff --git a/swad_date.c b/swad_date.c
index bb332db6..ff16af81 100644
--- a/swad_date.c
+++ b/swad_date.c
@@ -251,13 +251,15 @@ void Dat_GetAndConvertCurrentDateTime (void)
    Gbl.Now.Time.Second = tm_ptr->tm_sec;
 
    /***** Initialize current date in format YYYYMMDD *****/
-   sprintf (Gbl.Now.Date.YYYYMMDD,"%04u%02u%02u",
-            Gbl.Now.Date.Year,Gbl.Now.Date.Month,Gbl.Now.Date.Day);
+   snprintf (Gbl.Now.Date.YYYYMMDD,sizeof (Gbl.Now.Date.YYYYMMDD),
+	     "%04u%02u%02u",
+             Gbl.Now.Date.Year,Gbl.Now.Date.Month,Gbl.Now.Date.Day);
 
    /***** Initialize current time in format YYYYMMDDHHMMSS *****/
-   sprintf (Gbl.Now.YYYYMMDDHHMMSS,"%04u%02u%02u%02u%02u%02u",
-            Gbl.Now.Date.Year,Gbl.Now.Date.Month,Gbl.Now.Date.Day,
-            Gbl.Now.Time.Hour,Gbl.Now.Time.Minute,Gbl.Now.Time.Second);
+   snprintf (Gbl.Now.YYYYMMDDHHMMSS,sizeof (Gbl.Now.YYYYMMDDHHMMSS),
+	     "%04u%02u%02u%02u%02u%02u",
+             Gbl.Now.Date.Year,Gbl.Now.Date.Month,Gbl.Now.Date.Day,
+             Gbl.Now.Time.Hour,Gbl.Now.Time.Minute,Gbl.Now.Time.Second);
 
    /***** Compute what day was yesterday *****/
    Dat_GetDateBefore (&Gbl.Now.Date,&Gbl.Yesterday);
@@ -393,22 +395,25 @@ void Dat_ConvDateToDateStr (struct Date *Date,char StrDate[Cns_MAX_BYTES_DATE +
       switch (Gbl.Prefs.DateFormat)
         {
 	 case Dat_FORMAT_YYYY_MM_DD:
-	    sprintf (StrDate,"%04u-%02u-%02u",
-		     Date->Year,
-		     Date->Month,
-		     Date->Day);
+	    snprintf (StrDate,Cns_MAX_BYTES_DATE,
+		      "%04u-%02u-%02u",
+		      Date->Year,
+		      Date->Month,
+		      Date->Day);
 	    break;
 	 case Dat_FORMAT_DD_MONTH_YYYY:
-	    sprintf (StrDate,"%u&nbsp;%s&nbsp;%04u",
-		     Date->Day,
-		     Txt_MONTHS_SMALL_SHORT[Date->Month - 1],
-		     Date->Year);
+	    snprintf (StrDate,Cns_MAX_BYTES_DATE,
+		      "%u&nbsp;%s&nbsp;%04u",
+		      Date->Day,
+		      Txt_MONTHS_SMALL_SHORT[Date->Month - 1],
+		      Date->Year);
 	    break;
 	 case Dat_FORMAT_MONTH_DD_YYYY:
-	    sprintf (StrDate,"%s&nbsp;%u,&nbsp;%04u",
-		     Txt_MONTHS_SMALL_SHORT[Date->Month - 1],
-		     Date->Day,
-		     Date->Year);
+	    snprintf (StrDate,Cns_MAX_BYTES_DATE,
+		      "%s&nbsp;%u,&nbsp;%04u",
+		      Txt_MONTHS_SMALL_SHORT[Date->Month - 1],
+		      Date->Day,
+		      Date->Year);
 	    break;
         }
   }
@@ -776,13 +781,15 @@ void Dat_GetBrowserTimeZone (char BrowserTimeZone[Dat_MAX_BYTES_TIME_ZONE + 1])
       /* Convert from minutes to +-hh:mm */
       // BrowserTimeZone must have space for strings in +hh:mm format (6 chars + \0)
       if (ClientUTCMinusLocal > 0)
-	 sprintf (BrowserTimeZone,"-%02u:%02u",
-		  (unsigned) ClientUTCMinusLocal / 60,
-		  (unsigned) ClientUTCMinusLocal % 60);
+	 snprintf (BrowserTimeZone,Dat_MAX_BYTES_TIME_ZONE,
+	           "-%02u:%02u",
+		   (unsigned) ClientUTCMinusLocal / 60,
+		   (unsigned) ClientUTCMinusLocal % 60);
       else	// ClientUTCMinusLocal <= 0
-	 sprintf (BrowserTimeZone,"+%02u:%02u",
-		  (unsigned) (-ClientUTCMinusLocal) / 60,
-		  (unsigned) (-ClientUTCMinusLocal) % 60);
+	 snprintf (BrowserTimeZone,Dat_MAX_BYTES_TIME_ZONE,
+	           "+%02u:%02u",
+		   (unsigned) (-ClientUTCMinusLocal) / 60,
+		   (unsigned) (-ClientUTCMinusLocal) % 60);
      }
   }
 
diff --git a/swad_degree.c b/swad_degree.c
index 9276e2e3..7b79e9a7 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -243,7 +243,9 @@ void Deg_DrawDegreeLogoAndNameWithLink (struct Degree *Deg,Act_Action_t Action,
    Deg_PutParamDegCod (Deg->DegCod);
 
    /***** Link to action *****/
-   sprintf (Gbl.Title,Txt_Go_to_X,Deg->FullName);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     Txt_Go_to_X,
+	     Deg->FullName);
    Act_LinkFormSubmit (Gbl.Title,ClassLink,NULL);
 
    /***** Draw degree logo *****/
@@ -510,8 +512,9 @@ static void Deg_Configuration (bool PrintView)
 	 /* Form to go to see courses of this degree */
 	 Act_StartFormGoTo (ActSeeCrs);
 	 Deg_PutParamDegCod (Gbl.CurrentDeg.Deg.DegCod);
-	 sprintf (Gbl.Title,Txt_Courses_of_DEGREE_X,
-	          Gbl.CurrentDeg.Deg.ShrtName);
+	 snprintf (Gbl.Title,sizeof (Gbl.Title),
+	           Txt_Courses_of_DEGREE_X,
+	           Gbl.CurrentDeg.Deg.ShrtName);
 	 Act_LinkFormSubmit (Gbl.Title,"DAT",NULL);
 	 fprintf (Gbl.F.Out,"%u</a>",
 		  Crs_GetNumCrssInDeg (Gbl.CurrentDeg.Deg.DegCod));
@@ -1173,7 +1176,9 @@ static void Deg_ListDegrees (void)
    unsigned NumDeg;
 
    /***** Start box *****/
-   sprintf (Gbl.Title,Txt_Degrees_of_CENTRE_X,Gbl.CurrentCtr.Ctr.ShrtName);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     Txt_Degrees_of_CENTRE_X,
+	     Gbl.CurrentCtr.Ctr.ShrtName);
    Box_StartBox (NULL,Gbl.Title,Deg_PutIconsListDegrees,
                  Hlp_CENTRE_Degrees,Box_NOT_CLOSABLE);
 
@@ -1351,8 +1356,9 @@ void Deg_EditDegrees (void)
    DT_GetListDegreeTypes (Sco_SCOPE_SYS,DT_ORDER_BY_DEGREE_TYPE);
 
    /***** Start box *****/
-   sprintf (Gbl.Title,Txt_Degrees_of_CENTRE_X,
-            Gbl.CurrentCtr.Ctr.FullName);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     Txt_Degrees_of_CENTRE_X,
+             Gbl.CurrentCtr.Ctr.FullName);
    Box_StartBox (NULL,Gbl.Title,Deg_PutIconsEditingDegrees,
                  Hlp_CENTRE_Degrees,Box_NOT_CLOSABLE);
 
@@ -1877,10 +1883,11 @@ void Deg_RemoveDegreeCompletely (long DegCod)
    Brw_RemoveDegFilesFromDB (DegCod);
 
    /***** Remove directories of the degree *****/
-   sprintf (PathDeg,"%s/%s/%02u/%u",
-	    Cfg_PATH_SWAD_PUBLIC,Cfg_FOLDER_DEG,
-	    (unsigned) (DegCod % 100),
-	    (unsigned) DegCod);
+   snprintf (PathDeg,sizeof (PathDeg),
+	     "%s/%s/%02u/%u",
+	     Cfg_PATH_SWAD_PUBLIC,Cfg_FOLDER_DEG,
+	     (unsigned) (DegCod % 100),
+	     (unsigned) DegCod);
    Fil_RemoveTree (PathDeg);
 
    /***** Remove administrators of this degree *****/
@@ -2288,7 +2295,9 @@ void Deg_ShowAlertAndButtonToGoToDeg (void)
    if (Gbl.Degs.EditingDeg.DegCod != Gbl.CurrentDeg.Deg.DegCod)
      {
       /***** Alert with button to go to degree *****/
-      sprintf (Gbl.Title,Txt_Go_to_X,Gbl.Degs.EditingDeg.ShrtName);
+      snprintf (Gbl.Title,sizeof (Gbl.Title),
+	        Txt_Go_to_X,
+		Gbl.Degs.EditingDeg.ShrtName);
       Ale_ShowAlertAndButton (Gbl.Alert.Type,Gbl.Alert.Txt,
                               ActSeeCrs,NULL,NULL,Deg_PutParamGoToDeg,
                               Btn_CONFIRM_BUTTON,Gbl.Title);
@@ -2580,9 +2589,10 @@ unsigned Deg_ListDegsFound (const char *Query)
      {
       /***** Start box and table *****/
       /* Number of degrees found */
-      sprintf (Gbl.Title,"%u %s",
-               NumDegs,(NumDegs == 1) ? Txt_degree :
-        	                        Txt_degrees);
+      snprintf (Gbl.Title,sizeof (Gbl.Title),
+	        "%u %s",
+                NumDegs,(NumDegs == 1) ? Txt_degree :
+        	                         Txt_degrees);
       Box_StartBoxTable (NULL,Gbl.Title,NULL,
                          NULL,Box_NOT_CLOSABLE,2);
 
diff --git a/swad_enrolment.c b/swad_enrolment.c
index 4019d63f..11593bc9 100644
--- a/swad_enrolment.c
+++ b/swad_enrolment.c
@@ -25,6 +25,8 @@
 /*********************************** Headers *********************************/
 /*****************************************************************************/
 
+#define _GNU_SOURCE 		// For asprintf
+#include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For exit, system, malloc, free, rand, etc.
 #include <string.h>		// For string functions
 
@@ -2154,10 +2156,11 @@ void Enr_GetNotifEnrolmentRequest (char SummaryStr[Ntf_MAX_BYTES_SUMMARY + 1],
                       Ntf_MAX_BYTES_SUMMARY);
 
             if (GetContent)
-               if ((*ContentStr = (char *) malloc (256)))
-                  /* Write desired role into content */
-                  sprintf (*ContentStr,"%s",	// TODO: Write more info in this content
-                           Txt_ROLES_SINGUL_Abc[DesiredRole][UsrDat.Sex]);
+               /* Write desired role into content */
+               if (asprintf (ContentStr,
+        	             "%s",	// TODO: Write more info in this content
+                             Txt_ROLES_SINGUL_Abc[DesiredRole][UsrDat.Sex]) < 0)
+                  Lay_ShowErrorAndExit ("Not enough memory to store string.");
 
             /* Free memory used for user's data */
             Usr_UsrDataDestructor (&UsrDat);