不要调用strlen不止一次每串。

  INT的endsWith（为const char * str中，为const char *后缀）
{
    如果（！STR ||！后缀）
        返回0;
    为size_t len​​str = strlen的（STR）;
    为size_t len​​suffix = strlen的（后缀）;
    如果（lensuffix＆GT; lenstr）
        返回0;
    返回STRNCMP（STR + lenstr  -  lensuffix，后缀，lensuffix）== 0;
}INT EndsWithFoo（为const char * STR）{返回的endsWith（STR，包含.foo）; }
 

编辑：为迂腐添加NULL检查。对于超迂腐，讨论是否应该返回非零值，如果这两个海峡和后缀都是NULL。

I want to make sure my string ends with ".foo". I am using C, a language I am not totally familiar with. The best way I have found to do it is below. Any C gurus want to make sure I'm doing this elegantly and wisely?

int EndsWithFoo(char *str)
{
    if(strlen(str) >= strlen(".foo"))
    {
        if(!strcmp(str + strlen(str) - strlen(".foo"), ".foo"))
        {
            return 1;
        }
    }
    return 0;
}

Don't call strlen more than once per string.

int EndsWith(const char *str, const char *suffix)
{
    if (!str || !suffix)
        return 0;
    size_t lenstr = strlen(str);
    size_t lensuffix = strlen(suffix);
    if (lensuffix >  lenstr)
        return 0;
    return strncmp(str + lenstr - lensuffix, suffix, lensuffix) == 0;
}

int EndsWithFoo(const char *str) { return EndsWith(str, ".foo"); }

EDIT: added NULL check for the pedantic. For the ultra pedantic, debate whether it should return non-zero if both str and suffix are both NULL.