diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8x8_string.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8x8_string.c	Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,170 @@
+/*
+
+  u8x8_string.c
+  
+  string line procedures
+  
+  Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
+
+  Copyright (c) 2016, olikraus@gmail.com
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without modification, 
+  are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice, this list 
+    of conditions and the following disclaimer.
+    
+  * Redistributions in binary form must reproduce the above copyright notice, this 
+    list of conditions and the following disclaimer in the documentation and/or other 
+    materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
+  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
+  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.    
+
+*/
+
+#include "u8x8.h"
+
+uint8_t u8x8_GetStringLineCnt(const char *str)
+{
+  char e;
+  uint8_t line_cnt = 1;
+  if ( str == NULL )
+    return 0;
+  for(;;)
+  {
+    e = *str;
+    if ( e == '\0' )
+      break;
+    str++;
+    if ( e == '\n' )
+      line_cnt++;
+  }
+  return line_cnt;
+}
+
+
+/*
+    Assumes strings, separated by '\n' in "str".
+    Returns the string at index "line_idx". First strng has line_idx = 0
+    Example:
+      Returns "xyz" for line_idx = 1 with str = "abc\nxyz"
+    Support both UTF8 and normal strings.
+*/
+const char *u8x8_GetStringLineStart(uint8_t line_idx, const char *str )
+{
+  char e;
+  uint8_t line_cnt = 1;
+  
+  if ( line_idx == 0 )
+    return str;
+
+  for(;;)
+  {
+    e = *str;
+    if ( e == '\0' )
+      break;
+    str++;
+    if ( e == '\n' )
+    {
+      if ( line_cnt == line_idx )
+	return str;
+      line_cnt++;
+    }
+  }
+  return NULL;	/* line not found */
+}
+
+/* copy until first '\n' or '\0' in str */
+/* Important: There is no string overflow check, ensure */
+/* that the destination buffer is large enough */
+void u8x8_CopyStringLine(char *dest, uint8_t line_idx, const char *str)
+{
+  if ( dest == NULL )
+    return;
+  str = u8x8_GetStringLineStart( line_idx, str );
+  if ( str != NULL )
+  {
+    for(;;)
+    {
+      if ( *str == '\n' || *str == '\0' )
+	break;
+      *dest = *str;
+      dest++;
+      str++;
+    }
+  }
+  *dest = '\0';
+}
+
+/*
+  Draw a string
+  Extend the string to size "w"
+  Center the string within "w"
+  return the size of the string
+
+*/
+uint8_t u8x8_DrawUTF8Line(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t w, const char *s)
+{
+  uint8_t d, lw;
+  uint8_t cx, dx;
+    
+  d = 0;
+  
+  lw = u8x8_GetUTF8Len(u8x8, s);
+  if ( lw < w )
+  {
+    d = w;
+    d -=lw;
+    d /= 2;
+  }
+    
+  cx = x;
+  dx = cx + d;
+  while( cx < dx )
+  {
+    u8x8_DrawUTF8(u8x8, cx, y, " ");
+    cx++;
+  }
+  cx += u8x8_DrawUTF8(u8x8, cx, y, s);
+  dx = x + w;
+  while( cx < dx )
+  {
+    u8x8_DrawUTF8(u8x8, cx, y, " ");
+    cx++;
+  }
+  cx -= x;
+  return cx;
+}
+
+/*
+  draw several lines at position x,y.
+  lines are stored in s and must be separated with '\n'.
+  lines can be centered with respect to "w" 
+  if s == NULL nothing is drawn and 0 is returned
+  returns the number of lines in s
+*/
+uint8_t u8x8_DrawUTF8Lines(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t w, const char *s)
+{
+  uint8_t i;
+  uint8_t cnt;
+  cnt = u8x8_GetStringLineCnt(s);
+  for( i = 0; i < cnt; i++ )
+  {
+    u8x8_DrawUTF8Line(u8x8, x, y, w, u8x8_GetStringLineStart(i, s));
+    y++;
+  }
+  return cnt;
+}