dcigettext.c

研读AxCrypt对加解密的处理方法

      domain->conv != (__gconv_t) -1
# else
#  if HAVE_ICONV
      domain->conv != (iconv_t) -1
#  endif
# endif
      )
    {
      /* We are supposed to do a conversion.  First allocate an
	 appropriate table with the same structure as the table
	 of translations in the file, where we can put the pointers
	 to the converted strings in.
	 There is a slight complication with plural entries.  They
	 are represented by consecutive NUL terminated strings.  We
	 handle this case by converting RESULTLEN bytes, including
	 NULs.  */

      if (domain->conv_tab == NULL
	  && ((domain->conv_tab =
		 (char **) calloc (nstrings + domain->n_sysdep_strings,
				   sizeof (char *)))
	      == NULL))
	/* Mark that we didn't succeed allocating a table.  */
	domain->conv_tab = (char **) -1;

      if (__builtin_expect (domain->conv_tab == (char **) -1, 0))
	/* Nothing we can do, no more memory.  */
	goto converted;

      if (domain->conv_tab[act] == NULL)
	{
	  /* We haven't used this string so far, so it is not
	     translated yet.  Do this now.  */
	  /* We use a bit more efficient memory handling.
	     We allocate always larger blocks which get used over
	     time.  This is faster than many small allocations.   */
	  __libc_lock_define_initialized (static, lock)
# define INITIAL_BLOCK_SIZE	4080
	  static unsigned char *freemem;
	  static size_t freemem_size;

	  const unsigned char *inbuf;
	  unsigned char *outbuf;
	  int malloc_count;
# ifndef _LIBC
	  transmem_block_t *transmem_list = NULL;
# endif

	  __libc_lock_lock (lock);

	  inbuf = (const unsigned char *) result;
	  outbuf = freemem + sizeof (size_t);

	  malloc_count = 0;
	  while (1)
	    {
	      transmem_block_t *newmem;
# ifdef _LIBC
	      size_t non_reversible;
	      int res;

	      if (freemem_size < sizeof (size_t))
		goto resize_freemem;

	      res = __gconv (domain->conv,
			     &inbuf, inbuf + resultlen,
			     &outbuf,
			     outbuf + freemem_size - sizeof (size_t),
			     &non_reversible);

	      if (res == __GCONV_OK || res == __GCONV_EMPTY_INPUT)
		break;

	      if (res != __GCONV_FULL_OUTPUT)
		{
		  __libc_lock_unlock (lock);
		  goto converted;
		}

	      inbuf = result;
# else
#  if HAVE_ICONV
	      const char *inptr = (const char *) inbuf;
	      size_t inleft = resultlen;
	      char *outptr = (char *) outbuf;
	      size_t outleft;

	      if (freemem_size < sizeof (size_t))
		goto resize_freemem;

	      outleft = freemem_size - sizeof (size_t);
	      if (iconv (domain->conv,
			 (ICONV_CONST char **) &inptr, &inleft,
			 &outptr, &outleft)
		  != (size_t) (-1))
		{
		  outbuf = (unsigned char *) outptr;
		  break;
		}
	      if (errno != E2BIG)
		{
		  __libc_lock_unlock (lock);
		  goto converted;
		}
#  endif
# endif

	    resize_freemem:
	      /* We must allocate a new buffer or resize the old one.  */
	      if (malloc_count > 0)
		{
		  ++malloc_count;
		  freemem_size = malloc_count * INITIAL_BLOCK_SIZE;
		  newmem = (transmem_block_t *) realloc (transmem_list,
							 freemem_size);
# ifdef _LIBC
		  if (newmem != NULL)
		    transmem_list = transmem_list->next;
		  else
		    {
		      struct transmem_list *old = transmem_list;

		      transmem_list = transmem_list->next;
		      free (old);
		    }
# endif
		}
	      else
		{
		  malloc_count = 1;
		  freemem_size = INITIAL_BLOCK_SIZE;
		  newmem = (transmem_block_t *) malloc (freemem_size);
		}
	      if (__builtin_expect (newmem == NULL, 0))
		{
		  freemem = NULL;
		  freemem_size = 0;
		  __libc_lock_unlock (lock);
		  goto converted;
		}

# ifdef _LIBC
	      /* Add the block to the list of blocks we have to free
                 at some point.  */
	      newmem->next = transmem_list;
	      transmem_list = newmem;

	      freemem = newmem->data;
	      freemem_size -= offsetof (struct transmem_list, data);
# else
	      transmem_list = newmem;
	      freemem = newmem;
# endif

	      outbuf = freemem + sizeof (size_t);
	    }

	  /* We have now in our buffer a converted string.  Put this
	     into the table of conversions.  */
	  *(size_t *) freemem = outbuf - freemem - sizeof (size_t);
	  domain->conv_tab[act] = (char *) freemem;
	  /* Shrink freemem, but keep it aligned.  */
	  freemem_size -= outbuf - freemem;
	  freemem = outbuf;
	  freemem += freemem_size & (alignof (size_t) - 1);
	  freemem_size = freemem_size & ~ (alignof (size_t) - 1);

	  __libc_lock_unlock (lock);
	}

      /* Now domain->conv_tab[act] contains the translation of all
	 the plural variants.  */
      result = domain->conv_tab[act] + sizeof (size_t);
      resultlen = *(size_t *) domain->conv_tab[act];
    }

 converted:
  /* The result string is converted.  */

#endif /* _LIBC || HAVE_ICONV */

  *lengthp = resultlen;
  return result;
}


/* Look up a plural variant.  */
static char *
internal_function
plural_lookup (struct loaded_l10nfile *domain, unsigned long int n,
	       const char *translation, size_t translation_len)
{
  struct loaded_domain *domaindata = (struct loaded_domain *) domain->data;
  unsigned long int index;
  const char *p;

  index = plural_eval (domaindata->plural, n);
  if (index >= domaindata->nplurals)
    /* This should never happen.  It means the plural expression and the
       given maximum value do not match.  */
    index = 0;

  /* Skip INDEX strings at TRANSLATION.  */
  p = translation;
  while (index-- > 0)
    {
#ifdef _LIBC
      p = __rawmemchr (p, '\0');
#else
      p = strchr (p, '\0');
#endif
      /* And skip over the NUL byte.  */
      p++;

      if (p >= translation + translation_len)
	/* This should never happen.  It means the plural expression
	   evaluated to a value larger than the number of variants
	   available for MSGID1.  */
	return (char *) translation;
    }
  return (char *) p;
}

#ifndef _LIBC
/* Return string representation of locale CATEGORY.  */
static const char *
internal_function
category_to_name (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;
}
#endif

/* Guess value of current locale from value of the environment variables
   or system-dependent defaults.  */
static const char *
internal_function
guess_category_value (int category, const char *categoryname)
{
  const char *language;
  const char *locale;
#ifndef _LIBC
  const char *language_default;
  int locale_defaulted;
#endif

  /* We use the settings in the following order:
     1. The value of the environment variable 'LANGUAGE'.  This is a GNU
        extension.  Its value can be a colon-separated list of locale names.
     2. The value of the environment variable 'LC_ALL', 'LC_xxx', or 'LANG'.
        More precisely, the first among these that is set to a non-empty value.
        This is how POSIX specifies it.  The value is a single locale name.
     3. A system-dependent preference list of languages.  Its value can be a
        colon-separated list of locale names.
     4. A system-dependent default locale name.
     This way:
       - System-dependent settings can be overridden by environment variables.
       - If the system provides both a list of languages and a default locale,
         the former is used.  */

  /* Fetch the locale name, through the POSIX method of looking to `LC_ALL',
     `LC_xxx', and `LANG'.  On some systems this can be done by the
     `setlocale' function itself.  */
#ifdef _LIBC
  locale = __current_locale_name (category);
#else
  locale = _nl_locale_name_posix (category, categoryname);
  locale_defaulted = 0;
  if (locale == NULL)
    {
      locale = _nl_locale_name_default ();
      locale_defaulted = 1;
    }
#endif

  /* Ignore LANGUAGE and its system-dependent analogon if the locale is set
     to "C" because
     1. "C" locale usually uses the ASCII encoding, and most international
	messages use non-ASCII characters. These characters get displayed
	as question marks (if using glibc's iconv()) or as invalid 8-bit
	characters (because other iconv()s refuse to convert most non-ASCII
	characters to ASCII). In any case, the output is ugly.
     2. The precise output of some programs in the "C" locale is specified
	by POSIX and should not depend on environment variables like
	"LANGUAGE" or system-dependent information.  We allow such programs
        to use gettext().  */
  if (strcmp (locale, "C") == 0)
    return locale;

  /* The highest priority value is the value of the 'LANGUAGE' environment
     variable.  */
  language = getenv ("LANGUAGE");
  if (language != NULL && language[0] != '\0')
    return language;
#ifndef _LIBC
  /* The next priority value is the locale name, if not defaulted.  */
  if (locale_defaulted)
    {
      /* The next priority value is the default language preferences list. */
      language_default = _nl_language_preferences_default ();
      if (language_default != NULL)
        return language_default;
    }
  /* The least priority value is the locale name, if defaulted.  */
#endif
  return locale;
}

/* @@ 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 (char *dest, const char *src)
{
  while ((*dest++ = *src++) != '\0')
    /* Do nothing. */ ;
  return dest - 1;
}
#endif

#if !_LIBC && !HAVE_MEMPCPY
static void *
mempcpy (void *dest, const void *src, size_t n)
{
  return (void *) ((char *) memcpy (dest, src, n) + n);
}
#endif


#ifdef _LIBC
/* If we want to free all resources we have to do some work at
   program's end.  */
libc_freeres_fn (free_mem)
{
  void *old;

  while (_nl_domain_bindings != NULL)
    {
      struct binding *oldp = _nl_domain_bindings;
      _nl_domain_bindings = _nl_domain_bindings->next;
      if (oldp->dirname != INTUSE(_nl_default_dirname))
	/* Yes, this is a pointer comparison.  */
	free (oldp->dirname);
      free (oldp->codeset);
      free (oldp);
    }

  if (_nl_current_default_domain != _nl_default_default_domain)
    /* Yes, again a pointer comparison.  */
    free ((char *) _nl_current_default_domain);

  /* Remove the search tree with the known translations.  */
  __tdestroy (root, free);
  root = NULL;

  while (transmem_list != NULL)
    {
      old = transmem_list;
      transmem_list = transmem_list->next;
      free (old);
    }
}
#endif