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static char *
isvalidname(char *rname)
{
#ifdef FOREIGN_REG
    return NULL;
#else
    const char    *rejectstr[] =
	{"肥", "胖", "豬頭", "小白", "小明", "路人", "老王", "老李", "寶貝",
	 "先生", "帥哥", "老頭", "小姊", "小姐", "美女", "小妹", "大頭",
	 "公主", "同學", "寶寶", "公子", "大頭", "小小", "小弟", "小妹",
	 "妹妹", "嘿", "嗯", "爺爺", "大哥", "無",
	 NULL};
    if( removespace(rname) && rname[0] < 0 &&
	strlen(rname) >= 4 &&
	!HaveRejectStr(rname, rejectstr) &&
	strncmp(rname, "小", 2) != 0   && //起頭是「小」
	strncmp(rname, "我是", 4) != 0 && //起頭是「我是」
	!(strlen(rname) == 4 && strncmp(&rname[2], "兒", 2) == 0) &&
	!(strlen(rname) >= 4 && strncmp(&rname[0], &rname[2], 2) == 0))
	return NULL;
    return "您的輸入似乎不正確";
#endif
 
}

prog.c: In function ‘isvalidname’:
prog.c:12:3: error: ‘NULL’ undeclared (first use in this function)
   NULL};
   ^
prog.c:12:3: note: each undeclared identifier is reported only once for each function it appears in
prog.c:13:5: warning: implicit declaration of function ‘removespace’ [-Wimplicit-function-declaration]
     if( removespace(rname) && rname[0] < 0 &&
     ^
prog.c:14:2: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration]
  strlen(rname) >= 4 &&
  ^
prog.c:14:2: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default]
prog.c:15:2: warning: implicit declaration of function ‘HaveRejectStr’ [-Wimplicit-function-declaration]
  !HaveRejectStr(rname, rejectstr) &&
  ^
prog.c:16:2: warning: implicit declaration of function ‘strncmp’ [-Wimplicit-function-declaration]
  strncmp(rname, "小", 2) != 0   && //起頭是「小」
  ^
prog.c:20:2: warning: return from incompatible pointer type [enabled by default]
  return NULL;
  ^
prog.c: At top level:
prog.c:2:1: warning: ‘isvalidname’ defined but not used [-Wunused-function]
 isvalidname(char *rname)
 ^

Standard output is empty