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-rw-r--r--lib/unicase/u-is-invariant.h64
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diff --git a/lib/unicase/u-is-invariant.h b/lib/unicase/u-is-invariant.h
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+/* Test whether a Unicode string is invariant under a given case mapping.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+ This program 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 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
+
+int
+FUNC (const UNIT *s, size_t n,
+ UNIT * (*mapping) (const UNIT *s, size_t n, const char *iso639_language,
+ uninorm_t nf,
+ UNIT *resultbuf, size_t *lengthp),
+ const char *iso639_language,
+ bool *resultp)
+{
+ UNIT normsbuf[2048 / sizeof (UNIT)];
+ UNIT *norms;
+ size_t norms_length;
+ UNIT mappedbuf[2048 / sizeof (UNIT)];
+ UNIT *mapped;
+ size_t mapped_length;
+
+ /* Apply canonical decomposition to S. */
+ norms_length = sizeof (normsbuf) / sizeof (UNIT);
+ norms = U_NORMALIZE (UNINORM_NFD, s, n, normsbuf, &norms_length);
+ if (norms == NULL)
+ /* errno is set here. */
+ return -1;
+
+ /* Apply mapping. */
+ mapped_length = sizeof (mappedbuf) / sizeof (UNIT);
+ mapped = mapping (norms, norms_length, iso639_language, NULL,
+ mappedbuf, &mapped_length);
+ if (mapped == NULL)
+ {
+ if (norms != normsbuf)
+ {
+ int saved_errno = errno;
+ free (norms);
+ errno = saved_errno;
+ }
+ return -1;
+ }
+
+ /* Compare. */
+ *resultp = (mapped_length == norms_length
+ && U_CMP (mapped, norms, norms_length) == 0);
+
+ if (mapped != mappedbuf)
+ free (mapped);
+ if (norms != normsbuf)
+ free (norms);
+ return 0;
+}