wchar.c

来自「ST5518机顶盒系统文件系统源代码！绝对超值！」· C语言 代码 · 共 145 行

/******************************************************************************

    File Name   : wchar.c

    Description : A local implementation of wchar.h

******************************************************************************/

/* Includes ---------------------------------------------------------------- */

#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include "wchar.h"

/* Private Types ----------------------------------------------------------- */

/* Private Constants ------------------------------------------------------- */

/* Private Variables ------------------------------------------------------- */

/* Private Macros ---------------------------------------------------------- */

/* Private Function Prototypes --------------------------------------------- */

/* Functions --------------------------------------------------------------- */



/******************************************************************************
Function Name : wcscpy
  Description : Copy a wchar_t string into another
   Parameters :
******************************************************************************/
wchar_t *wcscpy (wchar_t * dst, const wchar_t * src)
{
    wchar_t *rtn = dst;

    while (*src)
        *dst++ = *src++;
    *dst = L'\0';               /* final "\0" */

    return rtn;
}

/******************************************************************************
Function Name : wcslen
  Description : Calculate length of a string of wchar_t
   Parameters :
******************************************************************************/
int wcslen (const wchar_t * string)
{
    const wchar_t *ptr = string;
    int number = 0;

    while (*ptr++)
        number++;

    return number;
}

/******************************************************************************
Function Name : wcsncmp
  Description : Compare two strings of wchar_t
   Parameters :
******************************************************************************/
int wcsncmp (const wchar_t * string1, const wchar_t * string2, int MaxLength)
{
    const wchar_t *str1, *str2;
    int security = 0;

    str1 = string1;
    str2 = string2;
    while ((*str1 == *str2) && (security++ < MaxLength) && *str1)
    {
        str1++;
        str2++;
    }
    if (security >= MaxLength)
        return 0;
    if (*str1 < *str2)
        return -1;
    if (*str1 > *str2)
        return 1;
    return 0;
}


/******************************************************************************
Function Name : wcscvt
  Description : Convert a char* into a wchar_t*
   Parameters :
******************************************************************************/
wchar_t *wcscvt (const char *input, wchar_t * output)
{
    wchar_t *rtn = output;
        
    while (*input)
        *(output++) = (wchar_t) *(input++);
        
    *output = L'\0';

    return rtn;
}

/******************************************************************************
Function Name : wcschr
  Description : Searches for the first wide character in a wide string
   Parameters :
******************************************************************************/
int wcschr (const wchar_t * ParsedString, wchar_t ElementToSearch)
{
    const wchar_t *ptr = ParsedString;
    int count = 0;

    while (*ptr != ElementToSearch)
    {
        count++;
        if (!*ptr++)
            return -1;
    }
    return count;
}

/******************************************************************************
Function Name : wcschr2
  Description : Searches for the first wide character in a wide string.
                We look for an occurs of either Element1 or Element2.
                This function is heavily used.
   Parameters :
******************************************************************************/
int wcschr2 (const wchar_t * ParsedString, wchar_t Element1, wchar_t Element2)
{
    const wchar_t *ptr = ParsedString;
    int count = 0;

    while ((*ptr != Element1) && (*ptr != Element2))
    {
        count++;
        if (!*ptr++)
            return -1;
    }
    return count;
}