Improve one and two-letter scan list names (issue #206)

App/ui/helper.c

@@ -321,6 +321,16 @@ static void sort(int16_t *a, int16_t *b)
         x += 4;
       }
     }
+
+    bool IsEmptyName(const char *name, uint8_t len) {
+        if (name[0] == '\0' || name[0] == '\xff')
+            return true;
+        for (uint8_t i = 0; i < len; i++) {
+            if (name[i] != ' ' && name[i] != '\xff' && name[i] != '\0')
+                return false;
+        }
+        return true;
+    }
 #endif
     
 void UI_DrawLineBuffer(uint8_t (*buffer)[128], int16_t x1, int16_t y1, int16_t x2, int16_t y2, bool black)

App/ui/helper.h

@@ -38,6 +38,7 @@ void UI_DrawPixelBuffer(uint8_t (*buffer)[128], uint8_t x, uint8_t y, bool black
     void PutPixel(uint8_t x, uint8_t y, bool fill);
     void PutPixelStatus(uint8_t x, uint8_t y, bool fill);
     void GUI_DisplaySmallest(const char *pString, uint8_t x, uint8_t y, bool statusbar, bool fill);
+    bool IsEmptyName(const char *name, uint8_t len);
 #endif
 void UI_DrawLineBuffer(uint8_t (*buffer)[128], int16_t x1, int16_t y1, int16_t x2, int16_t y2, bool black);
 void UI_DrawRectangleBuffer(uint8_t (*buffer)[128], int16_t x1, int16_t y1, int16_t x2, int16_t y2, bool black);

App/ui/main.c

@@ -976,7 +976,7 @@ void UI_DisplayMain(void)
                         const char *name = gListName[countList - 1];
                         
                         // If name is empty/invalid, display number
-                        if (name[0] == '\0' || name[0] == '\xff') {
+                        if (IsEmptyName(name, sizeof(gListName[0]))) {
                             sprintf(String, "%02d", countList);
                             xStart = 117;  // 2-digit number aligned right
                             xDisplay = 119;

App/ui/menu.c

@@ -976,7 +976,7 @@ void UI_DisplayMenu(void)
                 const char *name = gListName[gSubMenuSelection - 1];
                 
                 // If first character is empty/invalid, display "N/A"
-                if (name[0] == '\0' || name[0] == '\xff')
+                if (IsEmptyName(name, sizeof(gListName[0])))
                     sprintf(String, "%02u", gSubMenuSelection);
                 else
                     sprintf(String, "%02u (%.3s)", gSubMenuSelection, name);
@@ -989,7 +989,7 @@ void UI_DisplayMenu(void)
             else {
                 const char *name = gListName[gSubMenuSelection - 1];
                 // If first character is empty/invalid, display "N/A"
-                if (name[0] == '\0' || name[0] == '\xff')
+                if (IsEmptyName(name, sizeof(gListName[0])))
                     sprintf(String, "%02u", gSubMenuSelection);
                 else
                     sprintf(String, "%02u (%.3s)", gSubMenuSelection, name);

App/ui/status.c

@@ -114,10 +114,7 @@ void UI_DisplayStatus()
                     const char *name = gListName[gEeprom.SCAN_LIST_DEFAULT - 1];
 
                     // Check if name is valid
-                    bool nameValid = (name[0] != '\0' && name[0] != '\xff');
-
-                    // Format the string
-                    if (nameValid) {
+                    if (!IsEmptyName(name, sizeof(gListName[0]))) {
                         sprintf(str, "%.3s%s", name, gEeprom.SCAN_LIST_ENABLED ? "+" : "");
                         end = gEeprom.SCAN_LIST_ENABLED ? 18 : 14;
                     }