Add a (very!) trivial cache to the example authentication callback.

examples/libsmbclient/get_auth_data_fn.h

@@ -8,7 +8,23 @@ get_auth_data_fn(const char * pServer,
                  char * pPassword,
                  int maxLenPassword)
 {
-    char temp[128];
+    char            temp[128];
+    char            server[256] = { '\0' };
+    char            share[256] = { '\0' };
+    char            workgroup[256] = { '\0' };
+    char            username[256] = { '\0' };
+    char            password[256] = { '\0' };
+
+    if (strcmp(server, pServer) == 0 &&
+        strcmp(share, pShare) == 0 &&
+        *workgroup != '\0' &&
+        *username != '\0')
+    {
+        strncpy(pWorkgroup, workgroup, maxLenWorkgroup - 1);
+        strncpy(pUsername, username, maxLenUsername - 1);
+        strncpy(pPassword, password, maxLenPassword - 1);
+        return;
+    }
 
     fprintf(stdout, "Workgroup: [%s] ", pWorkgroup);
     fgets(temp, sizeof(temp), stdin);
@@ -48,4 +64,8 @@ get_auth_data_fn(const char * pServer,
     {
         strncpy(pPassword, temp, maxLenPassword - 1);
     }
+
+    strncpy(workgroup, pWorkgroup, sizeof(workgroup) - 1);
+    strncpy(username, pUsername, sizeof(username) - 1);
+    strncpy(password, pPassword, sizeof(password) - 1);
 }