bugfix: textui换行后删除字符，无法回退到上一行的问题

kernel/lib/libUI/textui.c

@@ -227,25 +227,27 @@ int textui_putchar_window(struct textui_window_t *window, uint16_t character, ui
     }
     else if (character == '\b') // 退格
     {
-
-        --window->vlines.chromatic[window->vline_operating].index;
+        char bufff[128] = {0};
+        --(window->vlines.chromatic[window->vline_operating].index);
         {
             uint16_t tmp = window->vlines.chromatic[window->vline_operating].index;
-            window->vlines.chromatic[window->vline_operating].chars[tmp].c = ' ';
-            textui_refresh_characters(window, window->vline_operating, tmp, 1);
+            if (tmp >= 0)
+            {
+                window->vlines.chromatic[window->vline_operating].chars[tmp].c = ' ';
+                textui_refresh_characters(window, window->vline_operating, tmp, 1);
+            }
         }
-
         // 需要向上缩一行
-        if (window->vlines.chromatic[window->vline_operating].index < 0)
+        if (window->vlines.chromatic[window->vline_operating].index <= 0)
         {
             window->vlines.chromatic[window->vline_operating].index = 0;
             memset(window->vlines.chromatic[window->vline_operating].chars, 0, sizeof(struct textui_char_chromatic_t) * window->chars_per_line);
-            --window->vline_operating;
+            --(window->vline_operating);
             if (unlikely(window->vline_operating < 0))
                 window->vline_operating = window->vlines_num - 1;
 
             // 考虑是否向上滚动
-            if (likely(window->vlines_used >= __private_info.actual_line))
+            if (likely(window->vlines_used > __private_info.actual_line))
             {
                 --window->top_vline;
                 if (unlikely(window->top_vline < 0))
@@ -256,7 +258,11 @@ int textui_putchar_window(struct textui_window_t *window, uint16_t character, ui
         }
     }
     else
+    {
+        if (window->vlines.chromatic[window->vline_operating].index == window->chars_per_line)
+            __textui_new_line(window, window->vline_operating);
         __textui_putchar_window(window, character, FRcolor, BKcolor);
+    }
 
     spin_unlock_irqrestore(&window->lock, rflags);
     return 0;

kernel/lib/libUI/textui.h

@@ -56,7 +56,7 @@ struct textui_vline_normal_t
 struct textui_vline_chromatic_t
 {
     struct textui_char_chromatic_t *chars;
-    uint16_t index; // 当前操作的位置
+    int16_t index; // 当前操作的位置
 };
 
 /**
@@ -68,8 +68,8 @@ struct textui_window_t
     struct List list;
 
     uint32_t id;          // 窗口id
-    uint16_t vlines_num;  // 虚拟行总数
-    uint16_t vlines_used; // 当前已经使用了的虚拟行总数
+    int16_t vlines_num;  // 虚拟行总数
+    int16_t vlines_used; // 当前已经使用了的虚拟行总数
 
     // 指向虚拟行的数组的指针（二选一）
     union
@@ -78,16 +78,16 @@ struct textui_window_t
         struct textui_vline_chromatic_t *chromatic;
     } vlines;
 
-    uint16_t top_vline;       // 位于最顶上的那一个虚拟行的行号
-    uint16_t vline_operating; // 正在操作的vline
-    uint16_t chars_per_line;  // 每行最大容纳的字符数
+    int16_t top_vline;       // 位于最顶上的那一个虚拟行的行号
+    int16_t vline_operating; // 正在操作的vline
+    int16_t chars_per_line;  // 每行最大容纳的字符数
     uint8_t flags;            // 窗口flag
     spinlock_t lock;          // 窗口操作锁
 };
 
 struct textui_private_info_t
 {
-    uint16_t actual_line;                   // 真实行的数量
+    int16_t actual_line;                   // 真实行的数量
     struct textui_window_t *current_window; // 当前的主窗口
     struct textui_window_t *default_window; // 默认print到的窗口
 };