比较字符串是否相等（忽略前后空格）

bool trim_strcmp(const char* s1, const char* s2)
{
    if (s1 == s2)
    {
        return true;
    }

    if ((NULL == s1) || (NULL == s2))
    {
        return false;
    }

    int s_s1 = -1;
    int e_s1 = strlen(s1);
    int c_s1 = 0;
    int s_s2 = -1;
    int e_s2 = strlen(s2);
    int c_s2 = 0;
    int blank = ' ';

    while (*(s1 + ++s_s1) == blank);
    while (*(s2 + ++s_s2) == blank);

    //全是空格
    if ((s_s1 == e_s1) && (s_s2 == e_s2))
    {
        return true;
    }

    while (*(s1 + --e_s1) == blank);
    while (*(s2 + --e_s2) == blank);

    c_s1 = e_s1 - s_s1 + 1;
    c_s2 = e_s2 - s_s2 + 1;

    return (c_s1 == c_s2)?(0 == strncmp(s1 + s_s1, s2 + s_s2, c_s1)):false;
}

测试结果：