62 lines
2.0 KiB
C
62 lines
2.0 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_ntop.c
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* Convert network address to string.
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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 <stdio.h>
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const char* inet_ntop(int af,
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const void* restrict src,
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char* restrict dst,
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socklen_t size)
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{
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if ( af == AF_INET )
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{
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const unsigned char* ip = (const unsigned char*) src;
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int len = snprintf(dst, size, "%u.%u.%u.%u",
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ip[0], ip[1], ip[2], ip[3]);
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if ( len < 0 )
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return NULL;
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if ( size <= (size_t) len )
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return errno = ENOSPC, (const char*) NULL;
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return dst;
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}
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else if ( af == AF_INET6 )
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{
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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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const unsigned char* ip = (const unsigned char*) src;
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int len = snprintf(dst, size, "%x:%x:%x:%x:%x:%x:%x:%x",
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ip[0] << 8 | ip[1], ip[2] << 8 | ip[3],
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ip[4] << 8 | ip[5], ip[6] << 8 | ip[7],
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ip[8] << 8 | ip[9], ip[10] << 8 | ip[11],
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ip[12] << 8 | ip[13], ip[14] << 8 | ip[15]);
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if ( len < 0 )
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return NULL;
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if ( size <= (size_t) len )
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return errno = ENOSPC, (const char*) NULL;
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return dst;
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}
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else
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return errno = EAFNOSUPPORT, NULL;
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}
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