path: root/string/strxfrm_l.c

/* Copyright (C) 1995-2025 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 <langinfo.h>
#include <locale.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>

#ifndef STRING_TYPE
# define STRING_TYPE char
# define USTRING_TYPE unsigned char
# define STRXFRM __strxfrm_l
# define STRLEN strlen
# define STPNCPY __stpncpy
# define WEIGHT_H "../locale/weight.h"
# define SUFFIX	MB
# define L(arg) arg
#endif

#define CONCAT(a,b) CONCAT1(a,b)
#define CONCAT1(a,b) a##b

/* Maximum string size that is calculated with cached indices.  Right now this
   is an arbitrary value open to optimizations.  SMALL_STR_SIZE * 4 has to be
   lower than __MAX_ALLOCA_CUTOFF.  Keep localedata/xfrm-test.c in sync.  */
#define SMALL_STR_SIZE 4095

#include "../locale/localeinfo.h"
#include WEIGHT_H

/* Group locale data for shorter parameter lists.  */
typedef struct
{
  uint32_t nrules;
  unsigned char *rulesets;
  USTRING_TYPE *weights;
  int32_t *table;
  USTRING_TYPE *extra;
  int32_t *indirect;
} locale_data_t;

#ifndef WIDE_CHAR_VERSION

/* We need UTF-8 encoding of numbers.  */
static int
utf8_encode (char *buf, int val)
{
  int retval;

  if (val < 0x80)
    {
      *buf++ = (char) val;
      retval = 1;
    }
  else
    {
      int step;

      for (step = 2; step < 6; ++step)
	if ((val & (~(uint32_t)0 << (5 * step + 1))) == 0)
	  break;
      retval = step;

      *buf = (unsigned char) (~0xff >> step);
      --step;
      do
	{
	  buf[step] = 0x80 | (val & 0x3f);
	  val >>= 6;
	}
      while (--step > 0);
      *buf |= val;
    }

  return retval;
}
#endif

/* Find next weight and rule index.  Inlined since called for every char.  */
static __always_inline size_t
find_idx (const USTRING_TYPE **us, int32_t *weight_idx,
	  unsigned char *rule_idx, const locale_data_t *l_data, const int pass)
{
  int32_t tmp = findidx (l_data->table, l_data->indirect, l_data->extra, us,
			 -1);
  *rule_idx = tmp >> 24;
  int32_t idx = tmp & 0xffffff</