101 lines
3.4 KiB
C
Executable File
101 lines
3.4 KiB
C
Executable File
/* Compare UTF-8/UTF-16/UTF-32 strings using the collation rules of the current
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locale.
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Copyright (C) 2009-2024 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2009.
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This file is free software.
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It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
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You can redistribute it and/or modify it under either
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- the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3, or (at your
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option) any later version, or
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- the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version, or
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- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
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This file 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 and the GNU General Public License
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for more details.
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You should have received a copy of the GNU Lesser General Public
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License and of the GNU General Public License along with this
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program. If not, see <https://www.gnu.org/licenses/>. */
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int
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FUNC (const UNIT *s1, const UNIT *s2)
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{
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/* When this function succeeds, it sets errno back to its original value.
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When it fails, it sets errno, but also returns a meaningful return value,
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for the sake of callers which ignore errno. */
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int final_errno = errno;
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const char *encoding = locale_charset ();
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char *sl1;
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char *sl2;
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int result;
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/* Pass iconveh_error here, not iconveh_question_mark. Otherwise the
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conversion to locale encoding can do transliteration or map some
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characters to question marks, leading to results that depend on the
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iconv() implementation and are not obvious. */
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sl1 = U_STRCONV_TO_ENCODING (s1, encoding, iconveh_error);
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if (sl1 != NULL)
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{
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sl2 = U_STRCONV_TO_ENCODING (s2, encoding, iconveh_error);
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if (sl2 != NULL)
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{
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/* Compare sl1 and sl2. */
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errno = 0;
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result = strcoll (sl1, sl2);
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if (errno == 0)
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{
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/* strcoll succeeded. */
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free (sl1);
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free (sl2);
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/* The conversion to locale encoding can drop Unicode TAG
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characters. Therefore sl1 and sl2 may be equal when s1
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and s2 were in fact different. Return a nonzero result
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in this case. */
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if (result == 0)
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result = U_STRCMP (s1, s2);
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}
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else
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{
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/* strcoll failed. */
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final_errno = errno;
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free (sl1);
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free (sl2);
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result = U_STRCMP (s1, s2);
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}
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}
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else
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{
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/* s1 could be converted to locale encoding, s2 not. */
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final_errno = errno;
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free (sl1);
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result = -1;
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}
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}
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else
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{
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final_errno = errno;
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sl2 = U_STRCONV_TO_ENCODING (s2, encoding, iconveh_error);
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if (sl2 != NULL)
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{
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/* s2 could be converted to locale encoding, s1 not. */
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free (sl2);
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result = 1;
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}
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else
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{
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/* Neither s1 nor s2 could be converted to locale encoding. */
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result = U_STRCMP (s1, s2);
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}
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}
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errno = final_errno;
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return result;
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}
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