--- lbbs/src/str_process.c	2025/11/08 08:21:31	1.28
+++ lbbs/src/str_process.c	2025/11/17 12:16:48	1.31
@@ -6,6 +6,10 @@
  * Copyright (C) 2004-2025  Leaflet <leaflet@leafok.com>
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include "common.h"
 #include "log.h"
 #include "str_process.h"
@@ -38,14 +42,14 @@ int str_length(const char *str, int skip
 
 		if (skip_ctrl_seq && c == '\033' && str[i + 1] == '[') // Skip control sequence
 		{
-			for (i = i + 2; isdigit(str[i]) || str[i] == ';' || str[i] == '?'; i++)
+			for (i = i + 2; isdigit((int)str[i]) || str[i] == ';' || str[i] == '?'; i++)
 				;
 
 			if (str[i] == 'm') // valid
 			{
 				// skip
 			}
-			else if (isalpha(str[i]))
+			else if (isalpha((int)str[i]))
 			{
 				// unsupported ANSI CSI command
 			}
@@ -72,9 +76,15 @@ int str_length(const char *str, int skip
 
 			if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
 			{
+#ifdef _DEBUG
 				log_error("mbstowcs(%s) error\n", input_str);
+#endif
+				wc_len = (UTF8_fixed_width ? 2 : 1); // Fallback
+			}
+			else
+			{
+				wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));
 			}
-			wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));
 
 			i += (str_len - 1);
 			ret += wc_len;
@@ -132,9 +142,16 @@ int split_line(const char *buffer, int m
 
 			if (mbstowcs(wcs, input_str, 1) == (size_t)-1)
 			{
+#ifdef _DEBUG
 				log_error("mbstowcs(%s) error\n", input_str);
+#endif
+				wc_len = (UTF8_fixed_width ? 2 : 1); // Fallback
 			}
-			wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));
+			else
+			{
+				wc_len = (UTF8_fixed_width ? 2 : wcwidth(wcs[0]));
+			}
+
 			if (*p_display_len + wc_len > max_display_len)
 			{
 				break;