fixed str line handling

sys/utf8/string_list_picture_loop/Makefile

@@ -0,0 +1,14 @@
+CC = gcc
+
+CFLAGS = -g -Wall -I../../../csrc/. 
+
+SRC = $(shell ls ../../../csrc/*.c) $(shell ls ../common/*.c ) main.c 
+
+OBJ = $(SRC:.c=.o)
+
+u8g2_utf8: $(OBJ) 
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o u8g2_utf8
+
+clean:	
+	-rm $(OBJ) u8g2_utf8
+

sys/utf8/string_list_picture_loop/main.c

@@ -0,0 +1,45 @@
+
+#include "u8g2.h"
+#include <stdio.h>
+
+
+  
+u8g2_t u8g2;
+
+const char *str = "abc\ndef";
+
+int main(void)
+{
+  uint8_t i, cnt;
+
+  u8g2_SetupBuffer_Utf8(&u8g2, &u8g2_cb_r0);
+  u8x8_InitDisplay(u8g2_GetU8x8(&u8g2));
+  u8x8_SetPowerSave(u8g2_GetU8x8(&u8g2), 0);  
+  u8g2_SetFont(&u8g2, u8g2_font_helvB10_tr);
+  
+  
+#ifdef U8G2_WITH_HVLINE_COUNT
+    u8g2.hv_cnt = 0UL;
+#endif /* U8G2_WITH_HVLINE_COUNT */   
+        
+    u8g2_FirstPage(&u8g2);
+    i = 0;
+    cnt = u8x8_GetStringLineCnt(str);
+
+    do
+    {
+      for( i = 0; i < cnt; i++ )
+      {
+	u8g2_DrawStr(&u8g2, 0, i*12+11, u8x8_GetStringLine(i, str));
+      }      
+
+    } while( u8g2_NextPage(&u8g2) );
+#ifdef U8G2_WITH_HVLINE_COUNT
+    printf("hv cnt: %ld\n", u8g2.hv_cnt);
+#endif /* U8G2_WITH_HVLINE_COUNT */   
+    
+  utf8_show();
+  
+  return 0;
+}
+