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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
59 lines
2.8 KiB
C
59 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 et 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/dns/dns.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Writes dotted hostname to DNS message wire.
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*
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* The wire format is basically a sequence of Pascal strings, for each
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* label in the name. We only do enough validation to maintain protocol
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* invariants.
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*
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* @param name is a dotted NUL-terminated hostname string
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* @return bytes written (excluding NUL) or -1 w/ errno
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*/
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int PascalifyDnsName(uint8_t *buf, size_t size, const char *name) {
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size_t i, j, k, namelen;
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if ((namelen = strlen(name)) > DNS_NAME_MAX) return enametoolong();
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i = 0;
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if (size || namelen) {
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if (namelen + 1 > size) return enospc();
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buf[0] = '\0';
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j = 0;
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for (;;) {
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for (k = 0; name[j + k] && name[j + k] != '.'; ++k) {
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buf[i + k + 1] = name[j + k];
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}
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if (k) {
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if (k > DNS_LABEL_MAX) return enametoolong();
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buf[i] = k;
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i += k + 1;
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}
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j += k + 1;
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if (!name[j - 1]) {
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break;
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}
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}
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buf[i] = '\0';
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}
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return i;
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}
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