61 lines
2.8 KiB
C
61 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above 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 │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/fmt/itoa.h"
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#include "libc/sysv/consts/af.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Formats internet address to string.
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*
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* @param af can be AF_INET
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* @param src is the binary-encoded address, e.g. &addr->sin_addr
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* @param dst is the output string buffer
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* @param size is bytes in dst, which needs 16+ for IPv4
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* @return dst on success or NULL w/ errno
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*/
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const char *inet_ntop(int af, const void *src, char *dst, uint32_t size) {
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char *p;
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unsigned char *ip4;
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if (src) {
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if (af == AF_INET) {
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if (size >= 16) {
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p = dst;
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ip4 = src;
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p += uint64toarray_radix10(ip4[0], p);
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*p++ = '.';
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p += uint64toarray_radix10(ip4[1], p);
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*p++ = '.';
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p += uint64toarray_radix10(ip4[2], p);
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*p++ = '.';
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p += uint64toarray_radix10(ip4[3], p);
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*p = '\0';
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return dst;
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} else {
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enospc();
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}
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} else {
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eafnosupport();
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}
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} else {
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einval();
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}
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if (size) dst[0] = '\0';
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return NULL;
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}
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