--- lbbs/src/str_process.c	2025/11/10 12:53:16	1.29
+++ lbbs/src/str_process.c	2025/12/18 02:56:01	1.33
@@ -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 +76,7 @@ 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
+				log_debug("mbstowcs(%s) error\n", input_str);
 				wc_len = (UTF8_fixed_width ? 2 : 1); // Fallback
 			}
 			else
@@ -138,9 +140,7 @@ 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
+				log_debug("mbstowcs(%s) error\n", input_str);
 				wc_len = (UTF8_fixed_width ? 2 : 1); // Fallback
 			}
 			else
@@ -199,7 +199,7 @@ long split_data_lines(const char *p_buf,
 		// Exceed max_line_cnt
 		if (line_cnt + 1 >= line_offsets_count)
 		{
-			// log_error("Line count %d reaches limit %d\n", line_cnt + 1, line_offsets_count);
+			log_debug("Line count %d reaches limit %d\n", line_cnt + 1, line_offsets_count);
 			return line_cnt;
 		}