strpbrk.c

来自「test file nucleus source」· C语言 代码 · 共 87 行

/*************************************************************************
*
*               Copyright Mentor Graphics Corporation 2002
*                         All Rights Reserved.
*
* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS
* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS
* SUBJECT TO LICENSE TERMS.
*
*************************************************************************/

/*************************************************************************
* FILE NAME                                     VERSION
*
*       strpbrk.c                               Nucleus Common Library 1.1
*
* DESCRIPTION
*
*       This file contains the implementation of NCL_strpbrk.
*
* DATA STRUCTURES
*
*       None.
*
* FUNCTIONS
*
*       NCL_strpbrk
*
* DEPENDENCIES
*
*       ncl.h
*       string.h
*       nucleus.h
*
************************************************************************/

#define NU_NCL_SOURCE_FILE

#include "ncl\inc\ncl.h"
#include "ncl\inc\string.h"
#include "plus\nucleus.h"                                /* MMU Support */

/*************************************************************************
*
*   FUNCTION
*
*       NCL_strpbrk
*
*   DESCRIPTION
*
*       Return a pointer to the first occurence in s1 of any character
*       contained in the string s2. Return 0 if no characters from s2
*       exist in s1.
*
*   INPUTS
*
*       s1                  String to search within
*       s2                  Characters to search for
*
*   OUTPUTS
*
*       char*               Pointer to first occurance of any chars
*                             within s2 in s1.
*
*************************************************************************/

char *NCL_strpbrk(register const char *s1, register const char *s2)
{
    register const char *p;
    register char c;

    while ((c = *s1++) != 0)
    {
        p = s2;
        do
        {
            if (*p == c)
            {
                return (char *)(s1 - 1);
            }
        } while (*p++);
    }

    return (char *)0;
}