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/* Classify a domain name for IDNA purposes.
Copyright (C) 2018-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <inet/net-internal.h>
#include <stdbool.h>
#include <string.h>
#include <wchar.h>
enum idna_name_classification
__idna_name_classify (const char *name)
{
mbstate_t mbs;
memset (&mbs, 0, sizeof (mbs));
const char *p = name;
const char *end = p + strlen (p) + 1;
bool nonascii = false;
bool backslash = false;
while (true)
{
wchar_t wc;
size_t result = mbrtowc (&wc, p, end - p, &mbs);
if (result == 0)
/* NUL terminator was reached. */
break;
else if (result == (size_t) -2)
/* Incomplete trailing multi-byte character. This is an
encoding error because we received the full name. */
return idna_name_encoding_error;
else if (result == (size_t) -1)
{
/* Other error, including EILSEQ. */
if (errno == EILSEQ)
return idna_name_encoding_error;
else if (errno == ENOMEM)
return idna_name_memory_error;
else
return idna_name_error;
}
else
{
/* A wide character was decoded. */
p += result;
if (wc == L'\\')
backslash = true;
else if (wc > 127)
nonascii = true;
}
}
if (nonascii)
{
if (backslash)
return idna_name_nonascii_backslash;
else
return idna_name_nonascii;
}
else
return idna_name_ascii;
}
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