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/* Implementation of the dcgettext(3) function

   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under 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.

   This program 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 General Public License for more details.

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

   along with this program; if not, write to the Free Software Foundation,

   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H

# include <config.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

#include <errno.h>

#ifndef errno

extern int errno;

#endif

#ifndef __set_errno

# define __set_errno(val) errno = (val)

#endif

#if defined STDC_HEADERS || defined _LIBC

# include <stdlib.h>

#else

char *getenv ();

# ifdef HAVE_MALLOC_H

#  include <malloc.h>

# else

void free ();

# endif

#endif

#if defined HAVE_STRING_H || defined _LIBC

# ifndef _GNU_SOURCE

#  define _GNU_SOURCE   1

# endif

# include <string.h>

#else

# include <strings.h>

#endif

#if !HAVE_STRCHR && !defined _LIBC

# ifndef strchr

#  define strchr index

# endif

#endif

#if defined HAVE_UNISTD_H || defined _LIBC

# include <unistd.h>

#endif

#include "gettext.h"

#include "gettextP.h"

#ifdef _LIBC

# include <libintl.h>

#else

# include "libgettext.h"

#endif

#include "hash-string.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.  */

# define getcwd __getcwd

# define stpcpy __stpcpy

#else

# if !defined HAVE_GETCWD

char *getwd ();

#  define getcwd(buf, max) getwd (buf)

# else

char *getcwd ();

# endif

# ifndef HAVE_STPCPY

static char *stpcpy PARAMS ((char *dest, const char *src));

# endif

#endif

/* Amount to increase buffer size by in each try.  */

#define PATH_INCR 32

/* The following is from pathmax.h.  */

/* Non-POSIX BSD systems might have gcc's limits.h, which doesn't define

   PATH_MAX but might cause redefinition warnings when sys/param.h is

   later included (as on MORE/BSD 4.3).  */

#if defined(_POSIX_VERSION) || (defined(HAVE_LIMITS_H) && !defined(__GNUC__))

# include <limits.h>

#endif

#ifndef _POSIX_PATH_MAX

# define _POSIX_PATH_MAX 255

#endif

#if !defined(PATH_MAX) && defined(_PC_PATH_MAX)

# define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 : pathconf ("/", _PC_PATH_MAX))

#endif

/* Don't include sys/param.h if it already has been.  */

#if defined(HAVE_SYS_PARAM_H) && !defined(PATH_MAX) && !defined(MAXPATHLEN)

# include <sys/param.h>

#endif

#if !defined(PATH_MAX) && defined(MAXPATHLEN)

# define PATH_MAX MAXPATHLEN

#endif

#ifndef PATH_MAX

# define PATH_MAX _POSIX_PATH_MAX

#endif

/* XPG3 defines the result of `setlocale (category, NULL)' as:

   ``Directs `setlocale()' to query `category' and return the current

     setting of `local'.''

   However it does not specify the exact format.  And even worse: POSIX

   defines this not at all.  So we can use this feature only on selected

   system (e.g. those using GNU C Library).  */

#ifdef _LIBC

# define HAVE_LOCALE_NULL

#endif

/* Name of the default domain used for gettext(3) prior any call to

   textdomain(3).  The default value for this is "messages".  */

const char _nl_default_default_domain[] = "messages";

/* Value used as the default domain for gettext(3).  */

const char *_nl_current_default_domain = _nl_default_default_domain;

/* Contains the default location of the message catalogs.  */

const char _nl_default_dirname[] = GNULOCALEDIR;

/* List with bindings of specific domains created by bindtextdomain()

   calls.  */

struct binding *_nl_domain_bindings;

/* Prototypes for local functions.  */

static char *find_msg PARAMS ((struct loaded_l10nfile *domain_file,

                               const char *msgid));

static const char *category_to_name PARAMS ((int category));

static const char *guess_category_value PARAMS ((int category,

                                                 const char *categoryname));

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

   some additional code emulating it.  */

#ifdef HAVE_ALLOCA

/* Nothing has to be done.  */

# define ADD_BLOCK(list, address) /* nothing */

# define FREE_BLOCKS(list) /* nothing */

#else

struct block_list

{

  void *address;

  struct block_list *next;

};

# define ADD_BLOCK(list, addr)                                                \

  do {                                                                        \

    struct block_list *newp = (struct block_list *) malloc (sizeof (*newp));  \

    /* If we cannot get a free block we cannot add the new element to         \

       the list.  */                                                          \

    if (newp != NULL) {                                                       \

      newp->address = (addr);                                                 \

      newp->next = (list);                                                    \

      (list) = newp;                                                          \

    }                                                                         \

  } while (0)

# define FREE_BLOCKS(list)                                                    \

  do {                                                                        \

    while (list != NULL) {                                                    \

      struct block_list *old = list;                                          \

      list = list->next;                                                      \

      free (old);                                                             \

    }                                                                         \

  } while (0)

# undef alloca

# define alloca(size) (malloc (size))

#endif  /* have alloca */

/* Names for the libintl functions are a problem.  They must not clash

   with existing names and they should follow ANSI C.  But this source

   code is also used in GNU C Library where the names have a __

   prefix.  So we have to make a difference here.  */

#ifdef _LIBC

# define DCGETTEXT __dcgettext

#else

# define DCGETTEXT dcgettext__

#endif

/* Look up MSGID in the DOMAINNAME message catalog for the current CATEGORY

   locale.  */

char *

DCGETTEXT (domainname, msgid, category)

     const char *domainname;

     const char *msgid;

     int category;

{

#ifndef HAVE_ALLOCA

  struct block_list *block_list = NULL;

#endif

  struct loaded_l10nfile *domain;

  struct binding *binding;

  const char *categoryname;

  const char *categoryvalue;

  char *dirname, *xdomainname;

  char *single_locale;

  char *retval;

  int saved_errno = errno;

  /* If no real MSGID is given return NULL.  */

  if (msgid == NULL)

    return NULL;

  /* If DOMAINNAME is NULL, we are interested in the default domain.  If

     CATEGORY is not LC_MESSAGES this might not make much sense but the

     defintion left this undefined.  */

  if (domainname == NULL)

    domainname = _nl_current_default_domain;

  /* First find matching binding.  */

  for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)

    {

      int compare = strcmp (domainname, binding->domainname);

      if (compare == 0)

        /* We found it!  */

        break;

      if (compare < 0)

        {

          /* It is not in the list.  */

          binding = NULL;

          break;

        }

    }

  if (binding == NULL)

    dirname = (char *) _nl_default_dirname;

  else if (binding->dirname[0] == '/')

    dirname = binding->dirname;

  else

    {

      /* We have a relative path.  Make it absolute now.  */

      size_t dirname_len = strlen (binding->dirname) + 1;

      size_t path_max;

      char *ret;

      path_max = (unsigned) PATH_MAX;

      path_max += 2;            /* The getcwd docs say to do this.  */

      dirname = (char *) alloca (path_max + dirname_len);

      ADD_BLOCK (block_list, dirname);

      __set_errno (0);

      while ((ret = getcwd (dirname, path_max)) == NULL && errno == ERANGE)

        {

          path_max += PATH_INCR;

          dirname = (char *) alloca (path_max + dirname_len);

          ADD_BLOCK (block_list, dirname);

          __set_errno (0);

        }

      if (ret == NULL)

        {

          /* We cannot get the current working directory.  Don't signal an

             error but simply return the default string.  */

          FREE_BLOCKS (block_list);

          __set_errno (saved_errno);

          return (char *) msgid;

        }

      stpcpy (stpcpy (strchr (dirname, '\0'), "/"), binding->dirname);

    }

  /* Now determine the symbolic name of CATEGORY and its value.  */

  categoryname = category_to_name (category);

  categoryvalue = guess_category_value (category, categoryname);

  xdomainname = (char *) alloca (strlen (categoryname)

                                 + strlen (domainname) + 5);

  ADD_BLOCK (block_list, xdomainname);

  stpcpy (stpcpy (stpcpy (stpcpy (xdomainname, categoryname), "/"),

                  domainname),

          ".mo");

  /* Creating working area.  */

  single_locale = (char *) alloca (strlen (categoryvalue) + 1);

  ADD_BLOCK (block_list, single_locale);

  /* Search for the given string.  This is a loop because we perhaps

     got an ordered list of languages to consider for th translation.  */

  while (1)

    {

      /* Make CATEGORYVALUE point to the next element of the list.  */

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

        ++categoryvalue;

      if (categoryvalue[0] == '\0')

        {

          /* The whole contents of CATEGORYVALUE has been searched but

             no valid entry has been found.  We solve this situation

             by implicitly appending a "C" entry, i.e. no translation

             will take place.  */

          single_locale[0] = 'C';

          single_locale[1] = '\0';

        }

      else

        {

          char *cp = single_locale;

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

            *cp++ = *categoryvalue++;

          *cp = '\0';

        }

      /* If the current locale value is C (or POSIX) we don't load a

         domain.  Return the MSGID.  */

      if (strcmp (single_locale, "C") == 0

          || strcmp (single_locale, "POSIX") == 0)

        {

          FREE_BLOCKS (block_list);

          __set_errno (saved_errno);

          return (char *) msgid;

        }

      /* Find structure describing the message catalog matching the

         DOMAINNAME and CATEGORY.  */

      domain = _nl_find_domain (dirname, single_locale, xdomainname);

      if (domain != NULL)

        {

          retval = find_msg (domain, msgid);

          if (retval == NULL)

            {

              int cnt;

              for (cnt = 0; domain->successor[cnt] != NULL; ++cnt)

                {

                  retval = find_msg (domain->successor[cnt], msgid);

                  if (retval != NULL)

                    break;

                }

            }

          if (retval != NULL)

            {

              FREE_BLOCKS (block_list);

              __set_errno (saved_errno);

              return retval;

            }

        }

    }

  /* NOTREACHED */

}

#ifdef _LIBC

/* Alias for function name in GNU C Library.  */

weak_alias (__dcgettext, dcgettext);

#endif

static char *

find_msg (domain_file, msgid)

     struct loaded_l10nfile *domain_file;

     const char *msgid;

{

  size_t top, act, bottom;

  struct loaded_domain *domain;

  if (domain_file->decided == 0)

    _nl_load_domain (domain_file);

  if (domain_file->data == NULL)

    return NULL;

  domain = (struct loaded_domain *) domain_file->data;

  /* Locate the MSGID and its translation.  */

  if (domain->hash_size > 2 && domain->hash_tab != NULL)

    {

      /* Use the hashing table.  */

      nls_uint32 len = strlen (msgid);

      nls_uint32 hash_val = hash_string (msgid);

      nls_uint32 idx = hash_val % domain->hash_size;

      nls_uint32 incr = 1 + (hash_val % (domain->hash_size - 2));

      nls_uint32 nstr = W (domain->must_swap, domain->hash_tab[idx]);

      if (nstr == 0)

        /* Hash table entry is empty.  */

        return NULL;

      if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len

          && strcmp (msgid,

                     domain->data + W (domain->must_swap,

                                       domain->orig_tab[nstr - 1].offset)) == 0)

        return (char *) domain->data + W (domain->must_swap,

                                          domain->trans_tab[nstr - 1].offset);

      while (1)

        {

          if (idx >= domain->hash_size - incr)

            idx -= domain->hash_size - incr;

          else

            idx += incr;

          nstr = W (domain->must_swap, domain->hash_tab[idx]);

          if (nstr == 0)

            /* Hash table entry is empty.  */

            return NULL;

          if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len

              && strcmp (msgid,

                         domain->data + W (domain->must_swap,

                                           domain->orig_tab[nstr - 1].offset))

                 == 0)

            return (char *) domain->data

              + W (domain->must_swap, domain->trans_tab[nstr - 1].offset);

        }

      /* NOTREACHED */

    }

  /* Now we try the default method:  binary search in the sorted

     array of messages.  */

  bottom = 0;

  top = domain->nstrings;

  while (bottom < top)

    {

      int cmp_val;

      act = (bottom + top) / 2;

      cmp_val = strcmp (msgid, domain->data

                               + W (domain->must_swap,

                                    domain->orig_tab[act].offset));

      if (cmp_val < 0)

        top = act;

      else if (cmp_val > 0)

        bottom = act + 1;

      else

        break;

    }

  /* If an translation is found return this.  */

  return bottom >= top ? NULL : (char *) domain->data

                                + W (domain->must_swap,

                                     domain->trans_tab[act].offset);

}

/* Return string representation of locale CATEGORY.  */

static const char *

category_to_name (category)

     int category;

{

  const char *retval;

  switch (category)

  {

#ifdef LC_COLLATE

  case LC_COLLATE:

    retval = "LC_COLLATE";

    break;

#endif

#ifdef LC_CTYPE

  case LC_CTYPE:

    retval = "LC_CTYPE";

    break;

#endif

#ifdef LC_MONETARY

  case LC_MONETARY:

    retval = "LC_MONETARY";

    break;

#endif

#ifdef LC_NUMERIC

  case LC_NUMERIC:

    retval = "LC_NUMERIC";

    break;

#endif

#ifdef LC_TIME

  case LC_TIME:

    retval = "LC_TIME";

    break;

#endif

#ifdef LC_MESSAGES

  case LC_MESSAGES:

    retval = "LC_MESSAGES";

    break;

#endif

#ifdef LC_RESPONSE

  case LC_RESPONSE:

    retval = "LC_RESPONSE";

    break;

#endif

#ifdef LC_ALL

  case LC_ALL:

    /* This might not make sense but is perhaps better than any other

       value.  */

    retval = "LC_ALL";

    break;

#endif

  default:

    /* If you have a better idea for a default value let me know.  */

    retval = "LC_XXX";

  }

  return retval;

}

/* Guess value of current locale from value of the environment variables.  */

static const char *

guess_category_value (category, categoryname)

     int category;

     const char *categoryname;

{

  const char *retval;

  /* The highest priority value is the `LANGUAGE' environment

     variable.  This is a GNU extension.  */

  retval = getenv ("LANGUAGE");

  if (retval != NULL && retval[0] != '\0')

    return retval;

  /* `LANGUAGE' is not set.  So we have to proceed with the POSIX

     methods of looking to `LC_ALL', `LC_xxx', and `LANG'.  On some

     systems this can be done by the `setlocale' function itself.  */

#if defined HAVE_SETLOCALE && defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL

  return setlocale (category, NULL);

#else

  /* Setting of LC_ALL overwrites all other.  */

  retval = getenv ("LC_ALL");

  if (retval != NULL && retval[0] != '\0')

    return retval;

  /* Next comes the name of the desired category.  */

  retval = getenv (categoryname);

  if (retval != NULL && retval[0] != '\0')

    return retval;

  /* Last possibility is the LANG environment variable.  */

  retval = getenv ("LANG");

  if (retval != NULL && retval[0] != '\0')

    return retval;

  /* We use C as the default domain.  POSIX says this is implementation

     defined.  */

  return "C";

#endif

}

/* @@ begin of epilog @@ */

/* We don't want libintl.a to depend on any other library.  So we

   avoid the non-standard function stpcpy.  In GNU C Library this

   function is available, though.  Also allow the symbol HAVE_STPCPY

   to be defined.  */

#if !_LIBC && !HAVE_STPCPY

static char *

stpcpy (dest, src)

     char *dest;

     const char *src;

{

  while ((*dest++ = *src++) != '\0')

    /* Do nothing. */ ;

  return dest - 1;

}

#endif