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-rw-r--r--lib/unicase/u-casexfrm.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/lib/unicase/u-casexfrm.h b/lib/unicase/u-casexfrm.h
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+++ b/lib/unicase/u-casexfrm.h
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+/* Locale dependent transformation for case insensitive comparison of Unicode
+ strings.
+ 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/>. */
+
+char *
+FUNC (const UNIT *s, size_t n, const char *iso639_language, uninorm_t nf,
+ char *resultbuf, size_t *lengthp)
+{
+ UNIT foldedsbuf[2048 / sizeof (UNIT)];
+ UNIT *foldeds;
+ size_t foldeds_length;
+ char convsbuf[2048];
+ char *convs;
+ size_t convs_length;
+ char *result;
+
+ /* Casefold and normalize the Unicode string. */
+ foldeds_length = sizeof (foldedsbuf) / sizeof (UNIT);
+ foldeds = U_CASEFOLD (s, n, iso639_language, nf, foldedsbuf, &foldeds_length);
+ if (foldeds == NULL)
+ /* errno is set here. */
+ return NULL;
+
+ /* Convert it to locale encoding. */
+ convs_length = sizeof (convsbuf) - 1;
+ convs = U_CONV_TO_ENCODING (locale_charset (),
+ iconveh_error,
+ foldeds, foldeds_length,
+ NULL,
+ convsbuf, &convs_length);
+ if (convs == NULL)
+ {
+ if (foldeds != foldedsbuf)
+ {
+ int saved_errno = errno;
+ free (foldeds);
+ errno = saved_errno;
+ }
+ return NULL;
+ }
+
+ if (foldeds != foldedsbuf)
+ free (foldeds);
+
+ /* Ensure one more byte is available. */
+ if (convs != convsbuf)
+ {
+ char *memory = (char *) realloc (convs, convs_length + 1);
+ if (memory == NULL)
+ {
+ free (convs);
+ errno = ENOMEM;
+ return NULL;
+ }
+ convs = memory;
+ }
+
+ /* Apply locale dependent transformations for comparison. */
+ result = memxfrm (convs, convs_length, resultbuf, lengthp);
+ if (result == NULL)
+ {
+ if (convs != convsbuf)
+ {
+ int saved_errno = errno;
+ free (convs);
+ errno = saved_errno;
+ }
+ return NULL;
+ }
+
+ if (convs != convsbuf)
+ free (convs);
+ return result;
+}