--- lbbs/src/str_process.c	2025/07/02 03:08:10	1.19
+++ lbbs/src/str_process.c	2025/10/18 12:06:10	1.21
@@ -20,6 +20,52 @@
 #include <stdio.h>
 #include <string.h>
 
+int str_length(const char *str, int skip_ctrl_seq)
+{
+	int i;
+	char c;
+	int ret = 0;
+
+	for (i = 0; str[i] != '\0'; i++)
+	{
+		c = str[i];
+
+		if (c == '\r' || c == '\7') // skip
+		{
+			continue;
+		}
+
+		if (skip_ctrl_seq && c == '\033' && str[i + 1] == '[') // Skip control sequence
+		{
+			i += 2;
+			while (str[i] != '\0' && str[i] != 'm')
+			{
+				i++;
+			}
+			continue;
+		}
+
+		// Process UTF-8 Chinese characters
+		if (c & 0x80) // head of multi-byte character
+		{
+			c = (c & 0x70) << 1;
+			while (c & 0x80)
+			{
+				i++;
+				c = (c & 0x7f) << 1;
+			}
+
+			ret += 2;
+		}
+		else
+		{
+			ret++;
+		}
+	}
+
+	return ret;
+}
+
 int split_line(const char *buffer, int max_display_len, int *p_eol, int *p_display_len, int skip_ctrl_seq)
 {
 	int i;
@@ -46,13 +92,20 @@ int split_line(const char *buffer, int m
 			continue;
 		}
 
-		if (c < 0 || c > 127) // GBK chinese character
+		if (c & 0x80) // head of multi-byte character
 		{
 			if (*p_display_len + 2 > max_display_len)
 			{
 				break;
 			}
-			i++;
+
+			c = (c & 0x70) << 1;
+			while (c & 0x80)
+			{
+				i++;
+				c = (c & 0x7f) << 1;
+			}
+
 			(*p_display_len) += 2;
 		}
 		else