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-rw-r--r--inet/idna_name_classify.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/inet/idna_name_classify.c b/inet/idna_name_classify.c
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index 0000000000..3683e1133f
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+++ b/inet/idna_name_classify.c
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+/* Classify a domain name for IDNA purposes.
+ Copyright (C) 2018 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
+ <http://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 becaue 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;
+}