str_to_ip ,ip_to_str

最新推荐文章于 2023-03-27 13:59:15 发布

原创最新推荐文章于 2023-03-27 13:59:15 发布 · 800 阅读

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#ip #str

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本文提供了两个用于IP地址转换的C语言函数：str_to_ip用于将点分十进制字符串转换为无符号整数形式的IP地址；ip_to_str则实现相反的转换过程，即将无符号整数形式的IP地址转换回点分十进制字符串形式。

unsigned int str_to_ip(const char *pStr)
{
    signed char j = 0;
    unsigned char cIp;
    unsigned int uiRet = 0;
    const char *p = pStr;

    cIp = (unsigned char)atoi(p);
    uiRet |= ( ((unsigned int)(cIp)) << (j*8) );
    j++;

    while ( (*p != 0) && j >= 0)
    {
        if (*p != '.')
        {
            p++;
            continue;
        }
        cIp = (unsigned char)atoi(++p);
        uiRet |= ( ((unsigned int)(cIp)) << (j*8) );
        j++;

    }

    return uiRet;
}


char * ip_to_str(const unsigned int iIp, char *pStr)
{
    unsigned char i;
    unsigned char cIp[4];

    for (i=0; i<4; i++)
        cIp[i] = (unsigned char)( (iIp>>(i*8)) & (0xff) );

    sprintf(pStr, "%d.%d.%d.%d", cIp[0], cIp[1], cIp[2], cIp[3]);
    return pStr;
}