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loadmsgcat.c

/* Load needed message catalogs.
   Copyright (C) 1995-1999, 2000, 2001 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library 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.  */

/* 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 <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.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 <stdlib.h>
#include <string.h>

#if defined HAVE_UNISTD_H || defined _LIBC
# include <unistd.h>
#endif

#ifdef _LIBC
# include <langinfo.h>
# include <locale.h>
#endif

#if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
    || (defined _LIBC && defined _POSIX_MAPPED_FILES)
# include <sys/mman.h>
# undef HAVE_MMAP
# define HAVE_MMAP      1
#else
# undef HAVE_MMAP
#endif

#include "gettext.h"
#include "gettextP.h"

#ifdef _LIBC
# include "../locale/localeinfo.h"
#endif

/* @@ end of prolog @@ */

#ifdef _LIBC
/* Rename the non ISO C functions.  This is required by the standard
   because some ISO C functions will require linking with this object
   file and the name space must not be polluted.  */
# define open   __open
# define close  __close
# define read   __read
# define mmap   __mmap
# define munmap __munmap
#endif

/* 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 PLURAL_PARSE __gettextparse
#else
# define PLURAL_PARSE gettextparse__
#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

/* For systems that distinguish between text and binary I/O.
   O_BINARY is usually declared in <fcntl.h>. */
#if !defined O_BINARY && defined _O_BINARY
  /* For MSC-compatible compilers.  */
# define O_BINARY _O_BINARY
# define O_TEXT _O_TEXT
#endif
#ifdef __BEOS__
  /* BeOS 5 has O_BINARY and O_TEXT, but they have no effect.  */
# undef O_BINARY
# undef O_TEXT
#endif
/* On reasonable systems, binary I/O is the default.  */
#ifndef O_BINARY
# define O_BINARY 0
#endif

/* We need a sign, whether a new catalog was loaded, which can be associated
   with all translations.  This is important if the translations are
   cached by one of GCC's features.  */
int _nl_msg_cat_cntr;

#if (defined __GNUC__ && !defined __APPLE_CC__) \
    || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)

/* These structs are the constant expression for the germanic plural
   form determination.  It represents the expression  "n != 1".  */
static const struct expression plvar =
{
  .nargs = 0,
  .operation = var,
};
static const struct expression plone =
{
  .nargs = 0,
  .operation = num,
  .val =
  {
    .num = 1
  }
};
static struct expression germanic_plural =
{
  .nargs = 2,
  .operation = not_equal,
  .val =
  {
    .args =
    {
      [0] = (struct expression *) &plvar,
      [1] = (struct expression *) &plone
    }
  }
};

# define INIT_GERMANIC_PLURAL()

#else

/* For compilers without support for ISO C 99 struct/union initializers:
   Initialization at run-time.  */

static struct expression plvar;
static struct expression plone;
static struct expression germanic_plural;

static void
init_germanic_plural ()
{
  if (plone.val.num == 0)
    {
      plvar.nargs = 0;
      plvar.operation = var;

      plone.nargs = 0;
      plone.operation = num;
      plone.val.num = 1;

      germanic_plural.nargs = 2;
      germanic_plural.operation = not_equal;
      germanic_plural.val.args[0] = &plvar;
      germanic_plural.val.args[1] = &plone;
    }
}

# define INIT_GERMANIC_PLURAL() init_germanic_plural ()

#endif


/* Initialize the codeset dependent parts of an opened message catalog.
   Return the header entry.  */
const char *
internal_function
_nl_init_domain_conv (domain_file, domain, domainbinding)
     struct loaded_l10nfile *domain_file;
     struct loaded_domain *domain;
     struct binding *domainbinding;
{
  /* Find out about the character set the file is encoded with.
     This can be found (in textual form) in the entry "".  If this
     entry does not exist or if this does not contain the `charset='
     information, we will assume the charset matches the one the
     current locale and we don't have to perform any conversion.  */
  char *nullentry;
  size_t nullentrylen;

  /* Preinitialize fields, to avoid recursion during _nl_find_msg.  */
  domain->codeset_cntr =
    (domainbinding != NULL ? domainbinding->codeset_cntr : 0);
#ifdef _LIBC
  domain->conv = (__gconv_t) -1;
#else
# if HAVE_ICONV
  domain->conv = (iconv_t) -1;
# endif
#endif
  domain->conv_tab = NULL;

  /* Get the header entry.  */
  nullentry = _nl_find_msg (domain_file, domainbinding, "", &nullentrylen);

  if (nullentry != NULL)
    {
#if defined _LIBC || HAVE_ICONV
      const char *charsetstr;

      charsetstr = strstr (nullentry, "charset=");
      if (charsetstr != NULL)
      {
        size_t len;
        char *charset;
        const char *outcharset;

        charsetstr += strlen ("charset=");
        len = strcspn (charsetstr, " \t\n");

        charset = (char *) alloca (len + 1);
# if defined _LIBC || HAVE_MEMPCPY
        *((char *) mempcpy (charset, charsetstr, len)) = '\0';
# else
        memcpy (charset, charsetstr, len);
        charset[len] = '\0';
# endif

        /* The output charset should normally be determined by the
           locale.  But sometimes the locale is not used or not correctly
           set up, so we provide a possibility for the user to override
           this.  Moreover, the value specified through
           bind_textdomain_codeset overrides both.  */
        if (domainbinding != NULL && domainbinding->codeset != NULL)
          outcharset = domainbinding->codeset;
        else
          {
            outcharset = getenv ("OUTPUT_CHARSET");
            if (outcharset == NULL || outcharset[0] == '\0')
            {
# ifdef _LIBC
              outcharset = (*_nl_current[LC_CTYPE])->values[_NL_ITEM_INDEX (CODESET)].string;
# else
#  if HAVE_ICONV
              extern const char *locale_charset (void);
              outcharset = locale_charset ();
#  endif
# endif
            }
          }

# ifdef _LIBC
        /* We always want to use transliteration.  */
        outcharset = norm_add_slashes (outcharset, "TRANSLIT");
        charset = norm_add_slashes (charset, NULL);
        if (__gconv_open (outcharset, charset, &domain->conv,
                      GCONV_AVOID_NOCONV)
            != __GCONV_OK)
          domain->conv = (__gconv_t) -1;
# else
#  if HAVE_ICONV
        /* When using GNU libiconv, we want to use transliteration.  */
#   if _LIBICONV_VERSION >= 0x0105
        len = strlen (outcharset);
        {
          char *tmp = (char *) alloca (len + 10 + 1);
          memcpy (tmp, outcharset, len);
          memcpy (tmp + len, "//TRANSLIT", 10 + 1);
          outcharset = tmp;
        }
#   endif
        domain->conv = iconv_open (outcharset, charset);
#   if _LIBICONV_VERSION >= 0x0105
        freea (outcharset);
#   endif
#  endif
# endif

        freea (charset);
      }
#endif /* _LIBC || HAVE_ICONV */
    }

  return nullentry;
}

/* Frees the codeset dependent parts of an opened message catalog.  */
void
internal_function
_nl_free_domain_conv (domain)
     struct loaded_domain *domain;
{
  if (domain->conv_tab != NULL && domain->conv_tab != (char **) -1)
    free (domain->conv_tab);

#ifdef _LIBC
  if (domain->conv != (__gconv_t) -1)
    __gconv_close (domain->conv);
#else
# if HAVE_ICONV
  if (domain->conv != (iconv_t) -1)
    iconv_close (domain->conv);
# endif
#endif
}

/* Load the message catalogs specified by FILENAME.  If it is no valid
   message catalog do nothing.  */
void
internal_function
_nl_load_domain (domain_file, domainbinding)
     struct loaded_l10nfile *domain_file;
     struct binding *domainbinding;
{
  int fd;
  size_t size;
#ifdef _LIBC
  struct stat64 st;
#else
  struct stat st;
#endif
  struct mo_file_header *data = (struct mo_file_header *) -1;
  int use_mmap = 0;
  struct loaded_domain *domain;
  const char *nullentry;

  domain_file->decided = 1;
  domain_file->data = NULL;

  /* Note that it would be useless to store domainbinding in domain_file
     because domainbinding might be == NULL now but != NULL later (after
     a call to bind_textdomain_codeset).  */

  /* If the record does not represent a valid locale the FILENAME
     might be NULL.  This can happen when according to the given
     specification the locale file name is different for XPG and CEN
     syntax.  */
  if (domain_file->filename == NULL)
    return;

  /* Try to open the addressed file.  */
  fd = open (domain_file->filename, O_RDONLY | O_BINARY);
  if (fd == -1)
    return;

  /* We must know about the size of the file.  */
  if (
#ifdef _LIBC
      __builtin_expect (fstat64 (fd, &st) != 0, 0)
#else
      __builtin_expect (fstat (fd, &st) != 0, 0)
#endif
      || __builtin_expect ((size = (size_t) st.st_size) != st.st_size, 0)
      || __builtin_expect (size < sizeof (struct mo_file_header), 0))
    {
      /* Something went wrong.  */
      close (fd);
      return;
    }

#ifdef HAVE_MMAP
  /* Now we are ready to load the file.  If mmap() is available we try
     this first.  If not available or it failed we try to load it.  */
  data = (struct mo_file_header *) mmap (NULL, size, PROT_READ,
                               MAP_PRIVATE, fd, 0);

  if (__builtin_expect (data != (struct mo_file_header *) -1, 1))
    {
      /* mmap() call was successful.  */
      close (fd);
      use_mmap = 1;
    }
#endif

  /* If the data is not yet available (i.e. mmap'ed) we try to load
     it manually.  */
  if (data == (struct mo_file_header *) -1)
    {
      size_t to_read;
      char *read_ptr;

      data = (struct mo_file_header *) malloc (size);
      if (data == NULL)
      return;

      to_read = size;
      read_ptr = (char *) data;
      do
      {
        long int nb = (long int) read (fd, read_ptr, to_read);
        if (nb <= 0)
          {
#ifdef EINTR
            if (nb == -1 && errno == EINTR)
            continue;
#endif
            close (fd);
            return;
          }
        read_ptr += nb;
        to_read -= nb;
      }
      while (to_read > 0);

      close (fd);
    }

  /* Using the magic number we can test whether it really is a message
     catalog file.  */
  if (__builtin_expect (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED,
                  0))
    {
      /* The magic number is wrong: not a message catalog file.  */
#ifdef HAVE_MMAP
      if (use_mmap)
      munmap ((caddr_t) data, size);
      else
#endif
      free (data);
      return;
    }

  domain = (struct loaded_domain *) malloc (sizeof (struct loaded_domain));
  if (domain == NULL)
    return;
  domain_file->data = domain;

  domain->data = (char *) data;
  domain->use_mmap = use_mmap;
  domain->mmap_size = size;
  domain->must_swap = data->magic != _MAGIC;

  /* Fill in the information about the available tables.  */
  switch (W (domain->must_swap, data->revision))
    {
    case 0:
      domain->nstrings = W (domain->must_swap, data->nstrings);
      domain->orig_tab = (struct string_desc *)
      ((char *) data + W (domain->must_swap, data->orig_tab_offset));
      domain->trans_tab = (struct string_desc *)
      ((char *) data + W (domain->must_swap, data->trans_tab_offset));
      domain->hash_size = W (domain->must_swap, data->hash_tab_size);
      domain->hash_tab = (nls_uint32 *)
      ((char *) data + W (domain->must_swap, data->hash_tab_offset));
      break;
    default:
      /* This is an invalid revision.  */
#ifdef HAVE_MMAP
      if (use_mmap)
      munmap ((caddr_t) data, size);
      else
#endif
      free (data);
      free (domain);
      domain_file->data = NULL;
      return;
    }

  /* Now initialize the character set converter from the character set
     the file is encoded with (found in the header entry) to the domain's
     specified character set or the locale's character set.  */
  nullentry = _nl_init_domain_conv (domain_file, domain, domainbinding);

  /* Also look for a plural specification.  */
  if (nullentry != NULL)
    {
      const char *plural;
      const char *nplurals;

      plural = strstr (nullentry, "plural=");
      nplurals = strstr (nullentry, "nplurals=");
      if (plural == NULL || nplurals == NULL)
      goto no_plural;
      else
      {
        /* First get the number.  */
        char *endp;
        unsigned long int n;
        struct parse_args args;

        nplurals += 9;
        while (*nplurals != '\0' && isspace (*nplurals))
          ++nplurals;
#if defined HAVE_STRTOUL || defined _LIBC
        n = strtoul (nplurals, &endp, 10);
#else
        for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
          n = n * 10 + (*endp - '0');
#endif
        domain->nplurals = n;
        if (nplurals == endp)
          goto no_plural;

        /* Due to the restrictions bison imposes onto the interface of the
           scanner function we have to put the input string and the result
           passed up from the parser into the same structure which address
           is passed down to the parser.  */
        plural += 7;
        args.cp = plural;
        if (PLURAL_PARSE (&args) != 0)
          goto no_plural;
        domain->plural = args.res;
      }
    }
  else
    {
      /* By default we are using the Germanic form: singular form only
         for `one', the plural form otherwise.  Yes, this is also what
         English is using since English is a Germanic language.  */
    no_plural:
      INIT_GERMANIC_PLURAL ();
      domain->plural = &germanic_plural;
      domain->nplurals = 2;
    }
}


#ifdef _LIBC
void
internal_function
_nl_unload_domain (domain)
     struct loaded_domain *domain;
{
  if (domain->plural != &germanic_plural)
    __gettext_free_exp (domain->plural);

  _nl_free_domain_conv (domain);

# ifdef _POSIX_MAPPED_FILES
  if (domain->use_mmap)
    munmap ((caddr_t) domain->data, domain->mmap_size);
  else
# endif     /* _POSIX_MAPPED_FILES */
    free ((void *) domain->data);

  free (domain);
}
#endif

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