| /* Test whether case matters for a Unicode string. |
| Copyright (C) 2009-2020 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 <https://www.gnu.org/licenses/>. */ |
| |
| int |
| FUNC (const UNIT *s, size_t n, const char *iso639_language, |
| bool *resultp) |
| { |
| UNIT normsbuf[2048 / sizeof (UNIT)]; |
| UNIT *norms; |
| size_t norms_length; |
| UNIT mappedbuf[2048 / sizeof (UNIT)]; |
| UNIT *mapped_toupper; |
| UNIT *mapped_tolower; |
| UNIT *mapped_totitle; |
| 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; |
| |
| mapped_length = sizeof (mappedbuf) / sizeof (UNIT); |
| |
| /* Apply toupper mapping. */ |
| mapped_toupper = U_TOUPPER (norms, norms_length, iso639_language, NULL, |
| mappedbuf, &mapped_length); |
| if (mapped_toupper == NULL) |
| goto fail; |
| |
| /* Compare. */ |
| if (!(mapped_length == norms_length |
| && U_CMP (mapped_toupper, norms, norms_length) == 0)) |
| { |
| if (mapped_toupper != mappedbuf) |
| free (mapped_toupper); |
| goto yes; |
| } |
| |
| /* Apply tolower mapping. */ |
| mapped_tolower = U_TOLOWER (norms, norms_length, iso639_language, NULL, |
| mapped_toupper, &mapped_length); |
| if (mapped_tolower == NULL) |
| { |
| if (mapped_toupper != mappedbuf) |
| { |
| int saved_errno = errno; |
| free (mapped_toupper); |
| errno = saved_errno; |
| } |
| goto fail; |
| } |
| |
| if (mapped_toupper != mapped_tolower && mapped_toupper != mappedbuf) |
| free (mapped_toupper); |
| |
| /* Compare. */ |
| if (!(mapped_length == norms_length |
| && U_CMP (mapped_tolower, norms, norms_length) == 0)) |
| { |
| if (mapped_tolower != mappedbuf) |
| free (mapped_tolower); |
| goto yes; |
| } |
| |
| /* Apply totitle mapping. */ |
| mapped_totitle = U_TOTITLE (norms, norms_length, iso639_language, NULL, |
| mapped_tolower, &mapped_length); |
| if (mapped_totitle == NULL) |
| { |
| if (mapped_tolower != mappedbuf) |
| { |
| int saved_errno = errno; |
| free (mapped_tolower); |
| errno = saved_errno; |
| } |
| goto fail; |
| } |
| |
| if (mapped_tolower != mapped_totitle && mapped_tolower != mappedbuf) |
| free (mapped_tolower); |
| |
| /* Compare. */ |
| if (!(mapped_length == norms_length |
| && U_CMP (mapped_totitle, norms, norms_length) == 0)) |
| { |
| if (mapped_totitle != mappedbuf) |
| free (mapped_totitle); |
| goto yes; |
| } |
| |
| if (mapped_totitle != mappedbuf) |
| free (mapped_totitle); |
| if (norms != normsbuf) |
| free (norms); |
| *resultp = false; |
| return 0; |
| |
| yes: |
| if (norms != normsbuf) |
| free (norms); |
| *resultp = true; |
| return 0; |
| |
| fail: |
| if (norms != normsbuf) |
| { |
| int saved_errno = errno; |
| free (norms); |
| errno = saved_errno; |
| } |
| return -1; |
| } |