lib/uninorm/u-normxfrm.h

   1 /* Locale dependent transformation for comparison of Unicode strings.
   2    Copyright (C) 2009-2024 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 char *
  27 FUNC (const UNIT *s, size_t n, uninorm_t nf,
  28       char *resultbuf, size_t *lengthp)
  29 {
  30   UNIT normsbuf[2048 / sizeof (UNIT)];
  31   UNIT *norms;
  32   size_t norms_length;
  33   char convsbuf[2048];
  34   char *convs;
  35   size_t convs_length;
  36   char *result;
  37
  38   /* Normalize the Unicode string.  */
  39   norms_length = sizeof (normsbuf) / sizeof (UNIT);
  40   norms = U_NORMALIZE (nf, s, n, normsbuf, &norms_length);
  41   if (norms == NULL)
  42     /* errno is set here.  */
  43     return NULL;
  44
  45   /* Convert it to locale encoding.  */
  46   convs_length = sizeof (convsbuf) - 1;
  47   convs = U_CONV_TO_ENCODING (locale_charset (),
  48                               iconveh_error,
  49                               norms, norms_length,
  50                               NULL,
  51                               convsbuf, &convs_length);
  52   if (convs == NULL)
  53     {
  54       if (norms != normsbuf)
  55         {
  56           int saved_errno = errno;
  57           free (norms);
  58           errno = saved_errno;
  59         }
  60       return NULL;
  61     }
  62
  63   if (norms != normsbuf)
  64     free (norms);
  65
  66   /* Ensure one more byte is available.  */
  67   if (convs != convsbuf)
  68     {
  69       char *memory = (char *) realloc (convs, convs_length + 1);
  70       if (memory == NULL)
  71         {
  72           free (convs);
  73           errno = ENOMEM;
  74           return NULL;
  75         }
  76       convs = memory;
  77     }
  78
  79   /* Apply locale dependent transformations for comparison.  */
  80   result = amemxfrm (convs, convs_length, resultbuf, lengthp);
  81   if (result == NULL)
  82     {
  83       if (convs != convsbuf)
  84         {
  85           int saved_errno = errno;
  86           free (convs);
  87           errno = saved_errno;
  88         }
  89       return NULL;
  90     }
  91
  92   if (convs != convsbuf)
  93     free (convs);
  94   return result;
  95 }