[router] bindings for go (#13384)

Signed-off-by: ybyang <ybyang7@iflytek.com>

sgl-router/bindings/golang/src/error.rs

@@ -0,0 +1,50 @@
+//! Error handling for FFI functions
+
+use std::ffi::CString;
+use std::os::raw::c_char;
+use std::ptr;
+
+/// Error codes returned by FFI functions
+#[repr(C)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum SglErrorCode {
+    Success = 0,
+    InvalidArgument = 1,
+    TokenizationError = 2,
+    ParsingError = 3,
+    MemoryError = 4,
+    UnknownError = 99,
+}
+
+/// Helper to set error message in FFI output parameter
+pub fn set_error_message(error_out: *mut *mut c_char, message: &str) {
+    unsafe {
+        if !error_out.is_null() {
+            if let Ok(cstr) = CString::new(message) {
+                *error_out = cstr.into_raw();
+            } else {
+                *error_out = ptr::null_mut();
+            }
+        }
+    }
+}
+
+/// Helper to set error message from format string
+pub fn set_error_message_fmt(error_out: *mut *mut c_char, fmt: std::fmt::Arguments) {
+    if !error_out.is_null() {
+        let msg = format!("{}", fmt);
+        set_error_message(error_out, &msg);
+    }
+}
+
+/// Helper to clear error message
+pub fn clear_error_message(error_out: *mut *mut c_char) {
+    unsafe {
+        if !error_out.is_null() {
+            *error_out = ptr::null_mut();
+        }
+    }
+}
+
+// Helper functions for error handling
+// Note: Some helper functions are kept for potential future use