gui__strcmp.c

ucgui的3.98版本的源代码

/*
*********************************************************************************************************
*                                             uC/GUI V3.98
*                        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__strcmp.c
Purpose     : Implementation of said function
---------------------------END-OF-HEADER------------------------------
*/

#include <stddef.h>           /* needed for definition of NULL */
#include "GUI_Protected.h"

/*********************************************************************
*
*       public code
*
**********************************************************************
*/
/*********************************************************************
*
*       GUI__strcmp
*
* Purpose:
*   Replacement for the strcmp function. The advantage is that it can
*   be called with NULL pointer(s).
*   A NULL string is treated as a an empty string ("").
* Return value:
*   0 if identical
*   1 else
*/
int GUI__strcmp(const char GUI_UNI_PTR * s0, const char GUI_UNI_PTR * s1) {
  if (s0 == NULL) {
    s0 = "";
  }
  if (s1 == NULL) {
    s1 = "";
  }
  do {
    if (*s0 != *s1) {
      return 1;
    }
    s1++;
  } while (*++s0);
  if (*s1) {
    return 1;    /* Not equal, since s1 is longer than s0 */
  }
  return 0;      /* Equal ! */
}

/*********************************************************************
*
*       GUI__strcmp_hp
*
* Purpose:
*  Replacement for the strcmp function. The advantage is that it can
*  be called with NULL pointer or 0 handle.
*  A NULL string is treated as a an empty string ("").
* Return value:
*  0 if identical
*  1 else
*/
int GUI__strcmp_hp(GUI_HMEM  hs0, const char GUI_UNI_PTR * s1) {
  const char* s0 = NULL;
  if (hs0) {
    s0 = (const char*)GUI_ALLOC_h2p(hs0);
  }
  return GUI__strcmp(s0, s1);
}

/*************************** End of file ****************************/