path: root/locale/loadlocale.c

/* Functions to read locale data files.
   Copyright (C) 1996-2025 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library 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 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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 the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef _POSIX_MAPPED_FILES
# include <sys/mman.h>
#endif
#include <sys/stat.h>

#include <not-cancel.h>
#include "localeinfo.h"


static const size_t _nl_category_num_items[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
  [category] = _NL_ITEM_INDEX (_NL_NUM_##category),
#include "categories.def"
#undef	DEFINE_CATEGORY
};


#define NO_PAREN(arg, rest...) arg, ##rest

/* The size of the array must be specified explicitly because some of
   the 'items' may be subarrays, which will cause the compiler to deduce
   an incorrect size from the initializer.  */
#define DEFINE_CATEGORY(category, category_name, items, a) \
static const enum value_type _nl_value_type_##category     \
  [_NL_ITEM_INDEX (_NL_NUM_##category)] = { NO_PAREN items };
#define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
  [_NL_ITEM_INDEX (element)] = type,
#include "categories.def"
#undef DEFINE_CATEGORY

static const enum value_type *const _nl_value_types[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
  [category] = _nl_value_type_##category,
#include "categories.def"
#undef DEFINE_CATEGORY
};

/* Fill in LOCDATA->private for the LC_CTYPE category.  */
static void
_nl_intern_locale_data_fill_cache_ctype (struct __locale_data *locdata)
{
  struct lc_ctype_data *data = locdata->private;

  /* Default to no translation.  Assumes zero initialization of *data.  */
  memset (data->outdigit_bytes, 1, sizeof (data->outdigit_bytes));

  for (int i = 0; i <= 9; ++i)
    {
      const char *digit
	= locdata->values[_NL_ITEM_INDEX (_NL_CTYPE_OUTDIGIT0_MB + i)].string;
      unsigned char len;
      if (digit[0] != '0' + i || digit[1] != '\0')
	 {
	   data->outdigit_translation_needed = true;
	   len = strlen (locdata->values[_NL_ITEM_INDEX
					 (_NL_CTYPE_OUTDIGIT0_MB + i)].string);
	 }
      else
	len = 1;
      data->outdigit_bytes[i] = len;
      if (i == 0)
	data->outdigit_bytes_all_equal = len;
      else if (data->outdigit_bytes_all_equal != len)
	data->outdigit_bytes_all_equal = 0;
    }
}

/* Updates data in LOCDATA->private for CATEGORY.  */
static void
_nl_intern_locale_data_fill_cache (int category, struct __locale_data *locdata)
{
  switch (category)
    {
    case LC_CTYPE:
      _nl_intern_locale_data_fill_cache_ctype (locdata);
      break;
    }
}

/* Returns the number of bytes allocated of struct __locale_data for
   CATEGORY.  */
static size_t
_nl_intern_locale_data_extra_size (int category)
{
  switch (category)
    {
    case LC_CTYPE:
      return sizeof (struct lc_ctype_data);
    default:
      return 0;
    }
}

struct __locale_data *
_nl_intern_locale_data (int category, const void *data, size_t datasize)
{
  const struct
    {
      unsigned int magic;
      unsigned int nstrings;
      unsigned int strindex[0];
    } *const filedata = data;
  struct __locale_data *newdata;
  size_t cnt;

  if (__builtin_expect (datasize < sizeof *filedata, 0)
      || __builtin_expect (filedata->magic != LIMAGIC (category), 0))
    {
      /* Bad data file.  */
      __set_errno (EINVAL);
      return NULL;
    }

  if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
			0)
      || (__builtin_expect (sizeof *filedata
			    + filedata->nstrings * sizeof (unsigned int)
			    >= datasize, 0)))
    {
      /* Insufficient data.  */
      __set_errno (EINVAL);
      return NULL;
    }

  size_t base_size = (sizeof *newdata
		      + filedata->nstrings * sizeof (union locale_data_value));
  size_t extra_size = _nl_intern_locale_data_extra_size (category);

  newdata = malloc (base_size + extra_size);
  if (newdata == NULL)
    return NULL;

  newdata->filedata = (void *) filedata;
  newdata->filesize = datasize;
  if (extra_size == 0)
    newdata->private = NULL;
  else
    {
      newdata->private = (char *) newdata + base_size;
      memset (newdata->private, 0, extra_size);
    }
  newdata->usage_count = 0;
  newdata->use_translit = 0;
  newdata->nstrings = filedata->nstrings;
  for (cnt = 0; cnt < newdata->nstrings; ++cnt)
    {
      size_t