int is_valid_ip(const char *ip)
{
int section = 0; //每一节的十进制值
int dot = 0; //几个点分隔符
int last = -1; //每一节中上一个字符
while(*ip){
if(*ip == '.'){
int is_valid_ip(const char *ip)
{
int section = 0; //每一节的十进制值
int dot = 0; //几个点分隔符
int last = -1; //每一节中上一个字符
while(*ip){
if(*ip == '.'){
dot++;
if(dot > 3){
return 0;
}
if(section >= 0 && section <=255){
section = 0;
}else{
return 0;
}
}else if(*ip >= '0' && *ip <= '9'){
section = section * 10 + *ip - '0';
if(last == '0'){
return 0;
}
}else{
return 0;
}
last = *ip;
ip++;
}
if(section >= 0 && section <=255){
section = 0;
}
return 1;
}
