1 /* Locale dependent transformation for case insensitive comparison of strings. 2 Copyright (C) 2009-2021 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2009. 4 5 This file is free software. 6 It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+". 7 You can redistribute it and/or modify it under either 8 - the terms of the GNU Lesser General Public License as published 9 by the Free Software Foundation; either version 3, or (at your 10 option) any later version, or 11 - the terms of the GNU General Public License as published by the 12 Free Software Foundation; either version 2, or (at your option) 13 any later version, or 14 - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+". 15 16 This file is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 Lesser General Public License and the GNU General Public License 20 for more details. 21 22 You should have received a copy of the GNU Lesser General Public 23 License and of the GNU General Public License along with this 24 program. If not, see <https://www.gnu.org/licenses/>. */ 25 26 #include <config.h> 27 28 /* Specification. */ 29 #include "unicase.h" 30 31 #include <errno.h> 32 #include <stdlib.h> 33 34 #include "uniconv.h" 35 36 char * 37 ulc_casexfrm (const char *s, size_t n, const char *iso639_language, /* */ 38 uninorm_t nf, 39 char *resultbuf, size_t *lengthp) 40 { 41 uint8_t convbuf[2048 / sizeof (uint8_t)]; 42 uint8_t *conv; 43 size_t conv_length; 44 char *result; 45 46 /* Convert the string to UTF-8. */ 47 conv_length = sizeof (convbuf) / sizeof (uint8_t); 48 conv = 49 u8_conv_from_encoding (locale_charset (), iconveh_error, s, n, NULL, 50 convbuf, &conv_length); 51 if (conv == NULL) 52 /* errno is set here. */ 53 return NULL; 54 55 /* Case-fold and normalize. */ 56 result = u8_casexfrm (conv, conv_length, iso639_language, nf, 57 resultbuf, lengthp); 58 if (result == NULL) 59 { 60 if (conv != convbuf) 61 { 62 int saved_errno = errno; 63 free (conv); 64 errno = saved_errno; 65 } 66 return NULL; 67 } 68 69 if (conv != convbuf) 70 free (conv); 71 return result; 72 }