| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include<arpa/inet.h> |
| #include<netinet/in.h> |
| #include<stdlib.h> |
| |
| #include"private/ErrnoRestorer.h" |
| |
| // The difference between inet_network(3) and inet_addr(3) is that |
| // inet_network uses host order and inet_addr network order. |
| in_addr_t inet_network(constchar* cp){ |
| in_addr_t network_order= inet_addr(cp); |
| return ntohl(network_order); |
| } |
| |
| in_addr_t inet_addr(constchar* cp){ |
| in_addr addr; |
| return inet_aton(cp,&addr)? addr.s_addr: INADDR_NONE; |
| } |
| |
| int inet_aton(constchar* cp, in_addr* addr){ |
| ErrnoRestorer errno_restorer; |
| |
| unsignedlong parts[4]; |
| size_t i; |
| for(i=0; i<4;++i){ |
| char* end; |
| errno=0; |
| parts[i]= strtoul(cp,&end,0); |
| if(errno!=0|| end== cp||(*end!='.'&&*end!='\0'))return0; |
| if(*end=='\0')break; |
| cp= end+1; |
| } |
| |
| uint32_t result=0; |
| if(i==0){ |
| // a (a 32-bit). |
| if(parts[0]>0xffffffff)return0; |
| result= parts[0]; |
| }elseif(i==1){ |
| // a.b (b 24-bit). |
| if(parts[0]>0xff|| parts[1]>0xffffff)return0; |
| result=(parts[0]<<24)| parts[1]; |
| }elseif(i==2){ |
| // a.b.c (c 16-bit). |
| if(parts[0]>0xff|| parts[1]>0xff|| parts[2]>0xffff)return0; |
| result=(parts[0]<<24)|(parts[1]<<16)| parts[2]; |
| }elseif(i==3){ |
| // a.b.c.d (d 8-bit). |
| if(parts[0]>0xff|| parts[1]>0xff|| parts[2]>0xff|| parts[3]>0xff)return0; |
| result=(parts[0]<<24)|(parts[1]<<16)|(parts[2]<<8)| parts[3]; |
| }else{ |
| return0; |
| } |
| |
| if(addr!=nullptr) addr->s_addr= htonl(result); |
| return1; |
| } |
