In easycsv_read_value, check if row and col are valid

Signed-off-by: Pradana AUMARS <paumars@courrier.dev>

src/easycsv.c

@@ -162,12 +162,22 @@ easycsv_read_value(const easycsv *csv,
     easycsv_error(EASYCSV_ZEROROW, NULL);
     return NULL;
   }
+
+  if (row > easycsv_print_rows(csv)) {
+    easycsv_error(EASYCSV_ROWNOTEXIST, NULL);
+    return NULL;
+  }
   
   if (col == 0) {
     easycsv_error(EASYCSV_ZEROCOL, NULL);
     return NULL;
   }
 
+  if (col > easycsv_print_columns(csv)) {
+    easycsv_error(EASYCSV_COLNOTEXIST, NULL);
+    return NULL;
+  }
+
   /* Set file pointer to start */
   easycsv_rewind(csv);