是否有一个C函数来查找字符串的子串的第二次出现？ [英] Is there a C function to find the second occurrence of substring in string?

问题描述

有一个C函数查找子串的字符串中第二次出现？

Is there a C function to find the second occurrence of sub-string in string?

即。字符串 - 。213文件状态550访问被拒绝550访问被拒绝

i.e. String - "213 File status 550 Access Denied. 550 Access Denied."

该函数将返回550找到两次......

This function would return "550 found twice"....

推荐答案

使用的strstr 。

int count_550s(char const *str)
{
    char const *p = str;
    int count;
    for (count = 0; ; ++count) {
        p = strstr(p, "550");
        if (!p)
            break;
        p++;
    }
    return count;
}

编辑：忘了回归

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