100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/*
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* Copyright (c) 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* arpa/inet/inet_pton.c
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* Convert string to network address.
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*/
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#include <sys/socket.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <string.h>
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int inet_pton(int af, const char* restrict src, void* restrict dst)
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{
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if ( af == AF_INET )
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{
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unsigned char ip[4];
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size_t index = 0;
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for ( int i = 0; i < 4; i++ )
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{
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if ( i && src[index++] != '.' )
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return 0;
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if ( src[index] < '0' || '9' < src[index] )
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return 0;
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int num = src[index++] - '0';
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if ( num )
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{
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if ( '0' <= src[index] && src[index] <= '9' )
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{
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num = 10 * num + src[index++] - '0';
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if ( '0' <= src[index] && src[index] <= '9' )
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{
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num = 10 * num + src[index++] - '0';
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if ( 256 <= num )
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return 0;
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}
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}
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}
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ip[i] = num;
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}
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if ( src[index] )
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return 0;
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memcpy(dst, ip, sizeof(ip));
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return 1;
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}
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else if ( af == AF_INET6 )
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{
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unsigned char ip[16];
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size_t index = 0;
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// TODO: Support for :: syntax.
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// TODO: Support for x:x:x:x:x:x:d.d.d.d syntax.
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for ( int i = 0; i < 8; i++ )
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{
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if ( i && src[index++] != ':' )
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return 0;
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int num = 0;
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for ( int j = 0; j < 4; j++ )
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{
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int dgt;
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if ( '0' <= src[index] && src[index] <= '9' )
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dgt = src[index] - '0';
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else if ( 'a' <= src[index] && src[index] <= 'f' )
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dgt = src[index] - 'a' + 10;
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else if ( 'A' <= src[index] && src[index] <= 'F' )
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dgt = src[index] - 'A' + 10;
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else
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{
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if ( j == 0 )
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return 0;
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break;
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}
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num = num << 4 | dgt;
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index++;
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}
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ip[2 * i + 0] = num >> 8 & 0xFF;
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ip[2 * i + 1] = num >> 0 & 0xFF;
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}
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if ( src[index] )
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return 0;
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memcpy(dst, ip, sizeof(ip));
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return 1;
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}
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else
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return errno = EAFNOSUPPORT, -1;
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}
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