54 lines
2.7 KiB
C
54 lines
2.7 KiB
C
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/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/fmt/fmt.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/sock.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/sysv/consts/af.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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if (src) {
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if (af == AF_INET) {
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unsigned char *p = (unsigned char *)src;
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if (snprintf(dst, size, "%hhu.%hhu.%hhu.%hhu", p[0], p[1], p[2], p[3]) <
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size) {
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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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