root/maint/gnulib/lib/unicase/u-casexfrm.h

/* */

INCLUDED FROM

DEFINITIONS

1. FUNC

   1 /* Locale dependent transformation for case insensitive comparison of Unicode
   2    strings.
   3    Copyright (C) 2009-2021 Free Software Foundation, Inc.
   4    Written by Bruno Haible <bruno@clisp.org>, 2009.
   5 
   6    This file is free software.
   7    It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
   8    You can redistribute it and/or modify it under either
   9      - the terms of the GNU Lesser General Public License as published
  10        by the Free Software Foundation; either version 3, or (at your
  11        option) any later version, or
  12      - the terms of the GNU General Public License as published by the
  13        Free Software Foundation; either version 2, or (at your option)
  14        any later version, or
  15      - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
  16 
  17    This file is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    Lesser General Public License and the GNU General Public License
  21    for more details.
  22 
  23    You should have received a copy of the GNU Lesser General Public
  24    License and of the GNU General Public License along with this
  25    program.  If not, see <https://www.gnu.org/licenses/>.  */
  26 
  27 char *
  28 FUNC (const UNIT *s, size_t n, const char *iso639_language, uninorm_t nf,
     /*  */
  29       char *resultbuf, size_t *lengthp)
  30 {
  31   UNIT foldedsbuf[2048 / sizeof (UNIT)];
  32   UNIT *foldeds;
  33   size_t foldeds_length;
  34   char convsbuf[2048];
  35   char *convs;
  36   size_t convs_length;
  37   char *result;
  38 
  39   /* Casefold and normalize the Unicode string.  */
  40   foldeds_length = sizeof (foldedsbuf) / sizeof (UNIT);
  41   foldeds = U_CASEFOLD (s, n, iso639_language, nf, foldedsbuf, &foldeds_length);
  42   if (foldeds == NULL)
  43     /* errno is set here.  */
  44     return NULL;
  45 
  46   /* Convert it to locale encoding.  */
  47   convs_length = sizeof (convsbuf) - 1;
  48   convs = U_CONV_TO_ENCODING (locale_charset (),
  49                               iconveh_error,
  50                               foldeds, foldeds_length,
  51                               NULL,
  52                               convsbuf, &convs_length);
  53   if (convs == NULL)
  54     {
  55       if (foldeds != foldedsbuf)
  56         {
  57           int saved_errno = errno;
  58           free (foldeds);
  59           errno = saved_errno;
  60         }
  61       return NULL;
  62     }
  63 
  64   if (foldeds != foldedsbuf)
  65     free (foldeds);
  66 
  67   /* Ensure one more byte is available.  */
  68   if (convs != convsbuf)
  69     {
  70       char *memory = (char *) realloc (convs, convs_length + 1);
  71       if (memory == NULL)
  72         {
  73           free (convs);
  74           errno = ENOMEM;
  75           return NULL;
  76         }
  77       convs = memory;
  78     }
  79 
  80   /* Apply locale dependent transformations for comparison.  */
  81   result = amemxfrm (convs, convs_length, resultbuf, lengthp);
  82   if (result == NULL)
  83     {
  84       if (convs != convsbuf)
  85         {
  86           int saved_errno = errno;
  87           free (convs);
  88           errno = saved_errno;
  89         }
  90       return NULL;
  91     }
  92 
  93   if (convs != convsbuf)
  94     free (convs);
  95   return result;
  96 }

/* */