diff --git a/example/main.c b/example/main.c
index 095266b..aaddf59 100644
--- a/example/main.c
+++ b/example/main.c
@@ -146,7 +146,7 @@ int main(void)
     ft_destroy_table(table);
 
     /*-------------------------------------------------------------*/
-#ifdef FT_HAVE_WCHAR
+#if defined(FT_HAVE_WCHAR) && !defined(FT_MICROSOFT_COMPILER)
     setlocale(LC_CTYPE, "");
 
     table = ft_create_table();
diff --git a/src/string_buffer.c b/src/string_buffer.c
index 344bd50..3780e58 100644
--- a/src/string_buffer.c
+++ b/src/string_buffer.c
@@ -316,30 +316,28 @@ int buffer_printf(string_buffer_t *buffer, size_t buffer_row, char *buf, size_t
 
 
     int  written = 0;
-    written += SNPRINT_N_CHARS(buf + written, buf_len - written, left, SPACE_CHAR);
-    if (written < 0)
-        return written;
-
+    int tmp = 0;
     const CHAR_TYPE *beg = NULL;
     const CHAR_TYPE *end = NULL;
+    CHAR_TYPE old_value;
+
+    CHCK_RSLT_ADD_TO_WRITTEN(SNPRINT_N_CHARS(buf + written, buf_len - written, left, SPACE_CHAR));
+
     STR_N_SUBSTRING(buffer->BUFFER_STR, NEWLINE_CHAR, buffer_row, &beg, &end);
     if (beg == NULL || end == NULL)
         return -1;
-    CHAR_TYPE old_value = *end;
+    old_value = *end;
     *(CHAR_TYPE *)end = NULL_CHAR;
 
-    written += SNPRINTF(buf + written, buf_len - written, SNPRINTF_FMT_STR, (int)(end - beg), beg);
+    CHCK_RSLT_ADD_TO_WRITTEN(SNPRINTF(buf + written, buf_len - written, SNPRINTF_FMT_STR, (int)(end - beg), beg));
     *(CHAR_TYPE *)end = old_value;
-    if (written < 0)
-        return written;
-    written += SNPRINT_N_CHARS(buf + written,  buf_len - written, (int)(content_width - STR_ITER_WIDTH(beg, end)), SPACE_CHAR);
-    if (written < 0)
-        return written;
-
-
-    written += SNPRINT_N_CHARS(buf + written, buf_len - written, right, SPACE_CHAR);
+    CHCK_RSLT_ADD_TO_WRITTEN(SNPRINT_N_CHARS(buf + written,  buf_len - written, (int)(content_width - STR_ITER_WIDTH(beg, end)), SPACE_CHAR));
+    CHCK_RSLT_ADD_TO_WRITTEN(SNPRINT_N_CHARS(buf + written, buf_len - written, right, SPACE_CHAR));
     return written;
 
+clear:
+    return -1;
+
 #undef CHAR_TYPE
 #undef NULL_CHAR
 #undef NEWLINE_CHAR
@@ -399,29 +397,28 @@ int buffer_wprintf(string_buffer_t *buffer, size_t buffer_row, wchar_t *buf, siz
         return -1;
 
     int  written = 0;
-    written += SNPRINT_N_CHARS(buf + written, buf_len - written, left, SPACE_CHAR);
-    if (written < 0)
-        return written;
-
+    int tmp = 0;
     const CHAR_TYPE *beg = NULL;
     const CHAR_TYPE *end = NULL;
+    CHAR_TYPE old_value;
+
+    CHCK_RSLT_ADD_TO_WRITTEN(SNPRINT_N_CHARS(buf + written, buf_len - written, left, SPACE_CHAR));
+
     STR_N_SUBSTRING(buffer->BUFFER_STR, NEWLINE_CHAR, buffer_row, &beg, &end);
     if (beg == NULL || end == NULL)
         return -1;
-    CHAR_TYPE old_value = *end;
+    old_value = *end;
     *(CHAR_TYPE *)end = NULL_CHAR;
 
-    written += SNPRINTF(buf + written, buf_len - written, SNPRINTF_FMT_STR, (int)(end - beg), beg);
+    CHCK_RSLT_ADD_TO_WRITTEN(SNPRINTF(buf + written, buf_len - written, SNPRINTF_FMT_STR, (int)(end - beg), beg));
     *(CHAR_TYPE *)end = old_value;
-    if (written < 0)
-        return written;
-    written += SNPRINT_N_CHARS(buf + written,  buf_len - written, (int)(content_width - STR_ITER_WIDTH(beg, end)), SPACE_CHAR);
-    if (written < 0)
-        return written;
-
-    written += SNPRINT_N_CHARS(buf + written, buf_len - written, right, SPACE_CHAR);
+    CHCK_RSLT_ADD_TO_WRITTEN(SNPRINT_N_CHARS(buf + written,  buf_len - written, (int)(content_width - STR_ITER_WIDTH(beg, end)), SPACE_CHAR));
+    CHCK_RSLT_ADD_TO_WRITTEN(SNPRINT_N_CHARS(buf + written, buf_len - written, right, SPACE_CHAR));
     return written;
 
+clear:
+    return -1;
+
 #undef CHAR_TYPE
 #undef NULL_CHAR
 #undef NEWLINE_CHAR