/* Lowercase mapping for UTF-8 strings (locale dependent).

   Copyright (C) 2009-2026 Free Software Foundation, Inc.

   Written by Bruno Haible <bruno@clisp.org>, 2009.

   This file is free software.

   It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".

   You can redistribute it and/or modify it under either

     - the terms of the GNU Lesser General Public License as published

       by the Free Software Foundation, either version 3, or (at your

       option) any later version, or

     - the terms of the GNU General Public License as published by the

       Free Software Foundation; either version 2, or (at your option)

       any later version, or

     - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".

   This file 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 and the GNU General Public License

   for more details.

   You should have received a copy of the GNU Lesser General Public

   License and of the GNU General Public License along with this

   program.  If not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */

#include "unicase.h"

#include <stddef.h>

#include "unicase/unicasemap.h"

#include "unicase/special-casing.h"

uint8_t *

u8_tolower (const uint8_t *s, size_t n, const char *iso639_language,

            uninorm_t nf,

            uint8_t *resultbuf, size_t *lengthp)

{

  return u8_casemap (s, n,

                     unicase_empty_prefix_context, unicase_empty_suffix_context,

                     iso639_language,

                     uc_tolower, offsetof (struct special_casing_rule, lower[0]),

                     nf,

                     resultbuf, lengthp);

}

#ifdef TEST

#include <locale.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

/* Read the contents of an input stream, and return it, terminated with a NUL

   byte. */

char *

read_file (FILE *stream)

{

#define BUFSIZE 4096

  char *buf = NULL;

  int alloc = 0;

  int size = 0;

  while (! feof (stream))

    {

      if (size + BUFSIZE > alloc)

        {

          alloc = alloc + alloc / 2;

          if (alloc < size + BUFSIZE)

            alloc = size + BUFSIZE;

          buf = realloc (buf, alloc);

          if (buf == NULL)

            {

              fprintf (stderr, "out of memory\n");

              exit (1);

            }

        }

      int count = fread (buf + size, 1, BUFSIZE, stream);

      if (count == 0)

        {

          if (ferror (stream))

            {

              perror ("fread");

              exit (1);

            }

        }

      else

        size += count;

    }

  buf = realloc (buf, size + 1);

  if (buf == NULL)

    {

      fprintf (stderr, "out of memory\n");

      exit (1);

    }

  buf[size] = '\0';

  return buf;

#undef BUFSIZE

}

int

main (int argc, char * argv[])

{

  setlocale (LC_ALL, "");

  if (argc == 1)

    {

      /* Display the lower case of the input string.  */

      char *input = read_file (stdin);

      int length = strlen (input);

      size_t output_length;

      uint8_t *output =

        u8_tolower ((uint8_t *) input, length, uc_locale_language (),

                    NULL,

                    NULL, &output_length);

      fwrite (output, 1, output_length, stdout);

      return 0;

    }

  else

    return 1;

}

#endif /* TEST */