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#include <newlib.h>

#ifdef _MB_CAPABLE

/* Handle aliases for locale names.

   Copyright (C) 1995-1999, 2000, 2001 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

/* Tell glibc's <string.h> to provide a prototype for mempcpy().

   This must come before <config.h> because <config.h> may include

   <features.h>, and once <features.h> has been included, it's too late.  */

#ifndef _GNU_SOURCE

# define _GNU_SOURCE    1

#endif

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <ctype.h>

#include <stdio.h>

#if defined _GLIBC || defined HAVE___FSETLOCKING

# include <stdio_ext.h>

#endif

#include <sys/types.h>

#ifdef __GNUC__

# define alloca __builtin_alloca

# define HAVE_ALLOCA 1

#else

# if defined HAVE_ALLOCA_H || defined _LIBC

#  include <alloca.h>

# else

#  ifdef _AIX

 #pragma alloca

#  else

#   ifndef alloca

char *alloca ();

#   endif

#  endif

# endif

#endif

#if defined STDC_HEADERS || defined _LIBC

# include <stdlib.h>

#else

# ifdef HAVE_MALLOC_H

#  include <malloc.h>

# else

void free ();

# endif

#endif

#if defined HAVE_STRING_H || defined _LIBC

# include <string.h>

#else

# include <strings.h>

# ifndef memcpy

#  define memcpy(Dst, Src, Num) (bcopy (Src, Dst, Num), (Dst))

# endif

#endif

#if !HAVE_STRCHR && !defined _LIBC

# ifndef strchr

#  define strchr index

# endif

#endif

#include "gettextP.h"

/* @@ end of prolog @@ */

#ifdef _LIBC

/* Rename the non ANSI C functions.  This is required by the standard

   because some ANSI C functions will require linking with this object

   file and the name space must not be polluted.  */

#ifdef _GLIBC

# define strcasecmp __strcasecmp

# ifndef mempcpy

#  define mempcpy __mempcpy

# endif

# define HAVE_MEMPCPY   1

# define HAVE___FSETLOCKING     1

#endif

/* We need locking here since we can be called from different places.  */

# include <bits/libc-lock.h>

__libc_lock_define_initialized (static, lock);

#endif

#ifndef internal_function

# define internal_function

#endif

/* Some optimizations for glibc.  */

#ifdef _GLIBC

# define FEOF(fp)               feof_unlocked (fp)

# define FGETS(buf, n, fp)      fgets_unlocked (buf, n, fp)

#else

# define FEOF(fp)               feof (fp)

# define FGETS(buf, n, fp)      fgets (buf, n, fp)

#endif

/* For those losing systems which don't have `alloca' we have to add

   some additional code emulating it.  */

#ifdef HAVE_ALLOCA

# define freea(p) /* nothing */

#else

# define alloca(n) malloc (n)

# define freea(p) free (p)

#endif

#if defined _LIBC_REENTRANT || defined HAVE_FGETS_UNLOCKED

# undef fgets

# define fgets(buf, len, s) fgets_unlocked (buf, len, s)

#endif

#if defined _LIBC_REENTRANT || defined HAVE_FEOF_UNLOCKED

# undef feof

# define feof(s) feof_unlocked (s)

#endif

struct alias_map

{

  const char *alias;

  const char *value;

};

static char *string_space;

static size_t string_space_act;

static size_t string_space_max;

static struct alias_map *map;

static size_t nmap;

static size_t maxmap;

/* Prototypes for local functions.  */

static size_t read_alias_file PARAMS ((const char *fname, int fname_len))

     internal_function;

static int extend_alias_table PARAMS ((void));

static int alias_compare PARAMS ((const struct alias_map *map1,

                                  const struct alias_map *map2));

const char *

_nl_expand_alias (name)

    const char *name;

{

  static const char *locale_alias_path = LOCALE_ALIAS_PATH;

  struct alias_map *retval;

  const char *result = NULL;

  size_t added;

#ifdef _LIBC

  __libc_lock_lock (lock);

#endif

  do

    {

      struct alias_map item;

      item.alias = name;

      if (nmap > 0)

        retval = (struct alias_map *) bsearch (&item, map, nmap,

                                               sizeof (struct alias_map),

                                               (int (*) PARAMS ((const void *,

                                                                 const void *))

                                                ) alias_compare);

      else

        retval = NULL;

      /* We really found an alias.  Return the value.  */

      if (retval != NULL)

        {

          result = retval->value;

          break;

        }

      /* Perhaps we can find another alias file.  */

      added = 0;

      while (added == 0 && locale_alias_path[0] != '\0')

        {

          const char *start;

          while (locale_alias_path[0] == ':')

            ++locale_alias_path;

          start = locale_alias_path;

          while (locale_alias_path[0] != '\0' && locale_alias_path[0] != ':')

            ++locale_alias_path;

          if (start < locale_alias_path)

            added = read_alias_file (start, locale_alias_path - start);

        }

    }

  while (added != 0);

#ifdef _LIBC

  __libc_lock_unlock (lock);

#endif

  return result;

}

static size_t

internal_function

read_alias_file (fname, fname_len)

     const char *fname;

     int fname_len;

{

  FILE *fp;

  char *full_fname;

  size_t added;

  static const char aliasfile[] = "/locale.alias";

  full_fname = (char *) alloca (fname_len + sizeof aliasfile);

#ifdef HAVE_MEMPCPY

  mempcpy (mempcpy (full_fname, fname, fname_len),

           aliasfile, sizeof aliasfile);

#else

  memcpy (full_fname, fname, fname_len);

  memcpy (&full_fname[fname_len], aliasfile, sizeof aliasfile);

#endif

  fp = fopen (full_fname, "r");

  freea (full_fname);

  if (fp == NULL)

    return 0;

#ifdef HAVE___FSETLOCKING

  /* No threads present.  */

  __fsetlocking (fp, FSETLOCKING_BYCALLER);

#endif

  added = 0;

  while (!FEOF (fp))

    {

      /* It is a reasonable approach to use a fix buffer here because

         a) we are only interested in the first two fields

         b) these fields must be usable as file names and so must not

            be that long

       */

      char buf[BUFSIZ];

      char *alias;

      char *value;

      char *cp;

      if (FGETS (buf, sizeof buf, fp) == NULL)

        /* EOF reached.  */

        break;

      /* Possibly not the whole line fits into the buffer.  Ignore

         the rest of the line.  */

      if (strchr (buf, '\n') == NULL)

        {

          char altbuf[BUFSIZ];

          do

            if (FGETS (altbuf, sizeof altbuf, fp) == NULL)

              /* Make sure the inner loop will be left.  The outer loop

                 will exit at the `feof' test.  */

              break;

          while (strchr (altbuf, '\n') == NULL);

        }

      cp = buf;

      /* Ignore leading white space.  */

      while (isspace (cp[0]))

        ++cp;

      /* A leading '#' signals a comment line.  */

      if (cp[0] != '\0' && cp[0] != '#')

        {

          alias = cp++;

          while (cp[0] != '\0' && !isspace (cp[0]))

            ++cp;

          /* Terminate alias name.  */

          if (cp[0] != '\0')

            *cp++ = '\0';

          /* Now look for the beginning of the value.  */

          while (isspace (cp[0]))

            ++cp;

          if (cp[0] != '\0')

            {

              size_t alias_len;

              size_t value_len;

              value = cp++;

              while (cp[0] != '\0' && !isspace (cp[0]))

                ++cp;

              /* Terminate value.  */

              if (cp[0] == '\n')

                {

                  /* This has to be done to make the following test

                     for the end of line possible.  We are looking for

                     the terminating '\n' which do not overwrite here.  */

                  *cp++ = '\0';

                  *cp = '\n';

                }

              else if (cp[0] != '\0')

                *cp++ = '\0';

              if (nmap >= maxmap)

                if (__builtin_expect (extend_alias_table (), 0))

                  return added;

              alias_len = strlen (alias) + 1;

              value_len = strlen (value) + 1;

              if (string_space_act + alias_len + value_len > string_space_max)

                {

                  /* Increase size of memory pool.  */

                  size_t new_size = (string_space_max

                                     + (alias_len + value_len > 1024

                                        ? alias_len + value_len : 1024));

                  char *new_pool = (char *) realloc (string_space, new_size);

                  if (new_pool == NULL)

                    return added;

                  if (__builtin_expect (string_space != new_pool, 0))

                    {

                      size_t i;

                      for (i = 0; i < nmap; i++)

                        {

                          map[i].alias += new_pool - string_space;

                          map[i].value += new_pool - string_space;

                        }

                    }

                  string_space = new_pool;

                  string_space_max = new_size;

                }

              map[nmap].alias = memcpy (&string_space[string_space_act],

                                        alias, alias_len);

              string_space_act += alias_len;

              map[nmap].value = memcpy (&string_space[string_space_act],

                                        value, value_len);

              string_space_act += value_len;

              ++nmap;

              ++added;

            }

        }

    }

  /* Should we test for ferror()?  I think we have to silently ignore

     errors.  --drepper  */

  fclose (fp);

  if (added > 0)

    qsort (map, nmap, sizeof (struct alias_map),

           (int (*) PARAMS ((const void *, const void *))) alias_compare);

  return added;

}

static int

extend_alias_table ()

{

  size_t new_size;

  struct alias_map *new_map;

  new_size = maxmap == 0 ? 100 : 2 * maxmap;

  new_map = (struct alias_map *) realloc (map, (new_size

                                                * sizeof (struct alias_map)));

  if (new_map == NULL)

    /* Simply don't extend: we don't have any more core.  */

    return -1;

  map = new_map;

  maxmap = new_size;

  return 0;

}

#ifdef _LIBC

static void __attribute__ ((unused))

free_mem (void)

{

  if (string_space != NULL)

    free (string_space);

  if (map != NULL)

    free (map);

}

text_set_element (__libc_subfreeres, free_mem);

#endif

static int

alias_compare (map1, map2)

     const struct alias_map *map1;

     const struct alias_map *map2;

{

#if defined _LIBC || defined HAVE_STRCASECMP

  return strcasecmp (map1->alias, map2->alias);

#else

  const unsigned char *p1 = (const unsigned char *) map1->alias;

  const unsigned char *p2 = (const unsigned char *) map2->alias;

  unsigned char c1, c2;

  if (p1 == p2)

    return 0;

  do

    {

      /* I know this seems to be odd but the tolower() function in

         some systems libc cannot handle nonalpha characters.  */

      c1 = isupper (*p1) ? tolower (*p1) : *p1;

      c2 = isupper (*p2) ? tolower (*p2) : *p2;

      if (c1 == '\0')

        break;

      ++p1;

      ++p2;

    }

  while (c1 == c2);

  return c1 - c2;

#endif

}

#endif /* _MB_CAPABLE */