gui__strlen.c

来自「STM32F103ZET6+UCOSII+UCGUI源码」· C语言 代码 · 共 47 行

/*
*********************************************************************************************************
*                                                uC/GUI
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : GUI__strlen.c
Purpose     : Implementation of GUI__strlen
---------------------------END-OF-HEADER------------------------------
*/

#include "GUI_Protected.h"

/*********************************************************************
*
*       public code
*
**********************************************************************
*/
/*********************************************************************
*
*       GUI__strlen
*
* Purpose:
*  Replacement for the strlen function. The advantage is that it can
*  be called with a NULL pointer, in which case -1 is returned.
*/
int GUI__strlen(const char GUI_UNI_PTR * s) {
  int r = -1;
  if (s) {
    do {
      r++;
    } while (*s++);
  }
  return r;
}

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