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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* Classify a domain name for IDNA purposes.
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Copyright (C) 2018-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <inet/net-internal.h>
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#include <stdbool.h>
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#include <string.h>
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#include <wchar.h>
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enum idna_name_classification
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__idna_name_classify (const char *name)
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{
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mbstate_t mbs;
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memset (&mbs, 0, sizeof (mbs));
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const char *p = name;
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const char *end = p + strlen (p) + 1;
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bool nonascii = false;
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bool backslash = false;
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while (true)
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{
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wchar_t wc;
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size_t result = mbrtowc (&wc, p, end - p, &mbs);
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if (result == 0)
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/* NUL terminator was reached. */
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break;
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else if (result == (size_t) -2)
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/* Incomplete trailing multi-byte character. This is an
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encoding error because we received the full name. */
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return idna_name_encoding_error;
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else if (result == (size_t) -1)
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{
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/* Other error, including EILSEQ. */
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if (errno == EILSEQ)
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return idna_name_encoding_error;
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else if (errno == ENOMEM)
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return idna_name_memory_error;
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else
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return idna_name_error;
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}
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else
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{
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/* A wide character was decoded. */
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p += result;
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if (wc == L'\\')
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backslash = true;
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else if (wc > 127)
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nonascii = true;
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}
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}
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if (nonascii)
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{
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if (backslash)
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return idna_name_nonascii_backslash;
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else
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return idna_name_nonascii;
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}
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else
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return idna_name_ascii;
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}
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