/* Find the first occurrence in S of any character in ACCEPT.  */
extern char *strpbrk (char *__s, const char *__accept)__THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
/* Return the length of the initial segment of S whichconsists entirely of characters in ACCEPT.
该函数返回 s 中第一个不在字符串 accept 中出现的字符下标。 */
extern size_t strspn (const char *__s, const char *__accept)__THROW __attribute_pure__ __nonnull ((1, 2));

现在结合代码和上面示例进行解析：
http_conn::HTTP_CODE http_conn::parse_request_line(char *text)
{m_url = strpbrk(text, " t");
//m_url=t/chapter17/user.html HTTP/1.1if (!m_url){return BAD_REQUEST;}*m_url++ = '0';
//将t替换为0  m_url=/chapter17/...char *method = text;
//应为有0的存在，method=POSTif (strcasecmp(method, "GET") == 0)m_method = GET;else if (strcasecmp(method, "POST") == 0){m_method = POST;cgi = 1;}elsereturn BAD_REQUEST;m_url += strspn(m_url, " t");
//确保第一个不是空格 m_url=/chapter17/...m_version = strpbrk(m_url, " t");
//m_version=tHTTP/1.1if (!m_version)return BAD_REQUEST;*m_version++ = '0';
//将t替换为0  m_version=HTTP1.1m_version += strspn(m_version, " t");if (strcasecmp(m_version, "HTTP/1.1") != 0)return BAD_REQUEST;if (strncasecmp(m_url, "http://", 7) == 0){m_url += 7;m_url = strchr(m_url, '/');}if (strncasecmp(m_url, "https://", 8) == 0){m_url += 8;m_url = strchr(m_url, '/');}if (!m_url || m_url[0] != '/')return BAD_REQUEST;//当url为/时，显示判断界面if (strlen(m_url) == 1)strcat(m_url, "judge.html");m_check_state = CHECK_STATE_HEADER;return NO_REQUEST;
}

char *strcpy(char *strDest，const char *strSrc);
微软中的此函数的参数说明：
/***
*char *strcpy(dst, src) - copy one string over another
*
*Purpose:
*       Copies the string src into the spot specified by
*       dest; assumes enough room.
*
*Entry:
*       char * dst - string over which "src" is to be copied
*       const char * src - string to be copied over "dst"
*
*Exit:
*       The address of "dst"
*
*Exceptions:
*******************************************************************************/

char * __cdecl strcpy(char * dst, const char * src)
{char * cp = dst;while( *cp++ = *src++ );               /* Copy src over dst */return( dst );//这块要注意一下返回dst，而不是cp，因为cp是栈上的变量，如果强行返回，
//会导致输出为乱码
}

char str[20];
int length = strlen( strcpy(str, “Hello World”) );