guiuc0.c

uCGUI

/*************************************************************************************************************
                                                   uC/GUI
*                              Universal graphic software for embedded applications

File        : GUIUC0.C
Purpose     : Implementation of character and string services
************************************************************************************************************/
#include <stddef.h>           /* needed for definition of NULL */
#include "GUI.H"
 
#if GUI_SUPPORT_UNICODE

/*************************************************************************************************************
*        UNICODE routines                              
*************************************************************************************************************/

/************************************************** GUI_UC2DB ************************************************
 Convert Convert UNICODE 16-bit value into double byte version
   Byte0: First byte, msb
   Byte1: Last  byte, lsb
*************************************************************************************************************/
void GUI_UC2DB (U16 Code, U8* pOut) 
{
/* move regular ASCII to (unused) 0xE000-0xE0ff area */
  if (Code < 0x100) 
  {
    if (Code !=0)  /* end marker ? */
      Code += 0xe000;
  } 
  else 
  {
/* If Low byte 0: Move to (unused) 0xE100-0xE1ff area */
    if ((Code&0xff) == 0) 
    {
      Code = (Code>>8) +0xe100;
    }
  }
/* Convert into double byte, putting msb first*/
  *pOut++ = Code >> 8;     /* Save msb first */
  *pOut   = Code & 0xff;
}

/********************************************* GUI_DB2UC *****************************************************
 Convert Unicode double byte into UNICODE
   Byte0: First byte, msb
   Byte1: Last  byte, lsb
*************************************************************************************************************/
U16 GUI_DB2UC (U8 Byte0, U8 Byte1) 
{
  if (Byte0==0)
    return 0;
  if ((Byte0&0xfe) == 0xe0) 
  {
    if (Byte0 == 0xe0)        /* ASCII */
      return Byte1;
    return ((U16)Byte1)<<8;   /* low byte was zero */
  }
  return Byte1 | (((U16)Byte0)<<8);
}

#else

void GUIUC0_C(void) {} /* avoid empty object files */

#endif /* GUI_SUPPORT_UNICODE */