gutils.c

嵌入式下基于MiniGUI的Web Browser

      return (gchar *)file_name;
    }

#ifdef G_OS_WIN32
  /* Skip X:\ */
  if (g_ascii_isalpha (file_name[0]) && file_name[1] == ':' && file_name[2] == G_DIR_SEPARATOR)
    return (gchar *)file_name + 3;
#endif

  return NULL;
}

gchar*
g_path_get_dirname (const gchar	   *file_name)
{
  register gchar *base;
  register gsize len;    
  
  g_return_val_if_fail (file_name != NULL, NULL);
  
  base = strrchr (file_name, G_DIR_SEPARATOR);
  if (!base)
    return g_strdup (".");
  while (base > file_name && *base == G_DIR_SEPARATOR)
    base--;
  len = (guint) 1 + base - file_name;
  
  base = g_new (gchar, len + 1);
  g_memmove (base, file_name, len);
  base[len] = 0;
  
  return base;
}

gchar*
g_get_current_dir (void)
{
  gchar *buffer = NULL;
  gchar *dir = NULL;
  static gulong max_len = 0;

  if (max_len == 0) 
    max_len = (G_PATH_LENGTH == -1) ? 2048 : G_PATH_LENGTH;
  
  /* We don't use getcwd(3) on SUNOS, because, it does a popen("pwd")
   * and, if that wasn't bad enough, hangs in doing so.
   */
#if	(defined (sun) && !defined (__SVR4)) || !defined(HAVE_GETCWD)
  buffer = g_new (gchar, max_len + 1);
  *buffer = 0;
  dir = getwd (buffer);
#else	/* !sun || !HAVE_GETCWD */
  while (max_len < G_MAXULONG / 2)
    {
      buffer = g_new (gchar, max_len + 1);
      *buffer = 0;
      dir = getcwd (buffer, max_len);

      if (dir || errno != ERANGE)
	break;

      g_free (buffer);
      max_len *= 2;
    }
#endif	/* !sun || !HAVE_GETCWD */
  
  if (!dir || !*buffer)
    {
      /* hm, should we g_error() out here?
       * this can happen if e.g. "./" has mode \0000
       */
      buffer[0] = G_DIR_SEPARATOR;
      buffer[1] = 0;
    }

  dir = g_strdup (buffer);
  g_free (buffer);
  
  return dir;
}

G_CONST_RETURN gchar*
g_getenv (const gchar *variable)
{
#ifndef G_OS_WIN32
  g_return_val_if_fail (variable != NULL, NULL);

  return getenv (variable);
#else
  G_LOCK_DEFINE_STATIC (getenv);
  struct env_struct
  {
    gchar *key;
    gchar *value;
  } *env;
  static GArray *environs = NULL;
  gchar *system_env;
  guint length, i;
  gchar dummy[2];

  g_return_val_if_fail (variable != NULL, NULL);
  
  G_LOCK (getenv);

  if (!environs)
    environs = g_array_new (FALSE, FALSE, sizeof (struct env_struct));

  /* First we try to find the envinronment variable inside the already
   * found ones.
   */

  for (i = 0; i < environs->len; i++)
    {
      env = &g_array_index (environs, struct env_struct, i);
      if (strcmp (env->key, variable) == 0)
	{
	  g_assert (env->value);
	  G_UNLOCK (getenv);
	  return env->value;
	}
    }

  /* If not found, we ask the system */

  system_env = getenv (variable);
  if (!system_env)
    {
      G_UNLOCK (getenv);
      return NULL;
    }

  /* On Windows NT, it is relatively typical that environment variables
   * contain references to other environment variables. Handle that by
   * calling ExpandEnvironmentStrings.
   */

  g_array_set_size (environs, environs->len + 1);

  env = &g_array_index (environs, struct env_struct, environs->len - 1);

  /* First check how much space we need */
  length = ExpandEnvironmentStrings (system_env, dummy, 2);

  /* Then allocate that much, and actualy do the expansion and insert
   * the new found pair into our buffer 
   */

  env->value = g_malloc (length);
  env->key = g_strdup (variable);

  ExpandEnvironmentStrings (system_env, env->value, length);

  G_UNLOCK (getenv);
  return env->value;
#endif
}


G_LOCK_DEFINE_STATIC (g_utils_global);

static	gchar	*g_tmp_dir = NULL;
static	gchar	*g_user_name = NULL;
static	gchar	*g_real_name = NULL;
static	gchar	*g_home_dir = NULL;

/* HOLDS: g_utils_global_lock */
static void
g_get_any_init (void)
{
  if (!g_tmp_dir)
    {
      g_tmp_dir = g_strdup (g_getenv ("TMPDIR"));
      if (!g_tmp_dir)
	g_tmp_dir = g_strdup (g_getenv ("TMP"));
      if (!g_tmp_dir)
	g_tmp_dir = g_strdup (g_getenv ("TEMP"));
      
#ifdef P_tmpdir
      if (!g_tmp_dir)
	{
	  gsize k;    
	  g_tmp_dir = g_strdup (P_tmpdir);
	  k = strlen (g_tmp_dir);
	  if (k > 1 && g_tmp_dir[k - 1] == G_DIR_SEPARATOR)
	    g_tmp_dir[k - 1] = '\0';
	}
#endif
      
      if (!g_tmp_dir)
	{
#ifndef G_OS_WIN32
	  g_tmp_dir = g_strdup ("/tmp");
#else /* G_OS_WIN32 */
	  g_tmp_dir = g_strdup ("C:\\");
#endif /* G_OS_WIN32 */
	}
      
#ifdef G_OS_WIN32
      /* We check $HOME first for Win32, though it is a last resort for Unix
       * where we prefer the results of getpwuid().
       */
      g_home_dir = g_strdup (g_getenv ("HOME"));
      
      /* In case HOME is Unix-style (it happens), convert it to
       * Windows style.
       */
      if (g_home_dir)
	{
	  gchar *p;
	  while ((p = strchr (g_home_dir, '/')) != NULL)
	    *p = '\\';
	}

      if (!g_home_dir)
	{
	  /* USERPROFILE is probably the closest equivalent to $HOME? */
	  if (getenv ("USERPROFILE") != NULL)
	    g_home_dir = g_strdup (g_getenv ("USERPROFILE"));
	}

      if (!g_home_dir)
	{
	  /* At least at some time, HOMEDRIVE and HOMEPATH were used
	   * to point to the home directory, I think. But on Windows
	   * 2000 HOMEDRIVE seems to be equal to SYSTEMDRIVE, and
	   * HOMEPATH is its root "\"?
	   */
	  if (getenv ("HOMEDRIVE") != NULL && getenv ("HOMEPATH") != NULL)
	    {
	      gchar *homedrive, *homepath;
	      
	      homedrive = g_strdup (g_getenv ("HOMEDRIVE"));
	      homepath = g_strdup (g_getenv ("HOMEPATH"));
	      
	      g_home_dir = g_strconcat (homedrive, homepath, NULL);
	      g_free (homedrive);
	      g_free (homepath);
	    }
	}
#endif /* G_OS_WIN32 */
      
#ifdef HAVE_PWD_H
      {
	struct passwd *pw = NULL;
	gpointer buffer = NULL;
        gint error;
	
#  if defined (HAVE_POSIX_GETPWUID_R) || defined (HAVE_NONPOSIX_GETPWUID_R)
        struct passwd pwd;
#    ifdef _SC_GETPW_R_SIZE_MAX  
	/* This reurns the maximum length */
        glong bufsize = sysconf (_SC_GETPW_R_SIZE_MAX);
	
	if (bufsize < 0)
	  bufsize = 64;
#    else /* _SC_GETPW_R_SIZE_MAX */
        glong bufsize = 64;
#    endif /* _SC_GETPW_R_SIZE_MAX */
	
        do
          {
            g_free (buffer);
            buffer = g_malloc (bufsize);
	    errno = 0;
	    
#    ifdef HAVE_POSIX_GETPWUID_R
	    error = getpwuid_r (getuid (), &pwd, buffer, bufsize, &pw);
            error = error < 0 ? errno : error;
#    else /* HAVE_NONPOSIX_GETPWUID_R */
#      ifdef _AIX
	    error = getpwuid_r (getuid (), &pwd, buffer, bufsize);
	    pw = error == 0 ? &pwd : NULL;
#      else /* !_AIX */
            pw = getpwuid_r (getuid (), &pwd, buffer, bufsize);
            error = pw ? 0 : errno;
#      endif /* !_AIX */            
#    endif /* HAVE_NONPOSIX_GETPWUID_R */
	    
	    if (!pw)
	      {
		/* we bail out prematurely if the user id can't be found
		 * (should be pretty rare case actually), or if the buffer
		 * should be sufficiently big and lookups are still not
		 * successfull.
		 */
		if (error == 0 || error == ENOENT)
		  {
		    g_warning ("getpwuid_r(): failed due to unknown user id (%lu)",
			       (gulong) getuid ());
		    break;
		  }
		if (bufsize > 32 * 1024)
		  {
		    g_warning ("getpwuid_r(): failed due to: %s.",
			       g_strerror (error));
		    break;
		  }
		
		bufsize *= 2;
	      }
	  }
	while (!pw);
#  endif /* HAVE_POSIX_GETPWUID_R || HAVE_NONPOSIX_GETPWUID_R */
	
	if (!pw)
	  {
	    setpwent ();
	    pw = getpwuid (getuid ());
	    endpwent ();
	  }
	if (pw)
	  {
	    g_user_name = g_strdup (pw->pw_name);
	    g_real_name = g_strdup (pw->pw_gecos);
	    if (!g_home_dir)
	      g_home_dir = g_strdup (pw->pw_dir);
	  }
	g_free (buffer);
      }
      
#else /* !HAVE_PWD_H */
      
#  ifdef G_OS_WIN32
      {
	guint len = UNLEN+1;
	gchar buffer[UNLEN+1];
	
	if (GetUserName ((LPTSTR) buffer, (LPDWORD) &len))
	  {
	    g_user_name = g_strdup (buffer);
	    g_real_name = g_strdup (buffer);
	  }
      }
#  endif /* G_OS_WIN32 */

#endif /* !HAVE_PWD_H */

      if (!g_home_dir)
	g_home_dir = g_strdup (g_getenv ("HOME"));
      
#ifdef __EMX__
      /* change '\\' in %HOME% to '/' */
      g_strdelimit (g_home_dir, "\\",'/');
#endif
      if (!g_user_name)
	g_user_name = g_strdup ("somebody");
      if (!g_real_name)
	g_real_name = g_strdup ("Unknown");
      else
	{
	  gchar *p;

	  for (p = g_real_name; *p; p++)
	    if (*p == ',')
	      {
		*p = 0;
		p = g_strdup (g_real_name);
		g_free (g_real_name);
		g_real_name = p;
		break;
	      }
	}
    }
}

G_CONST_RETURN gchar*
g_get_user_name (void)
{
  G_LOCK (g_utils_global);
  if (!g_tmp_dir)
    g_get_any_init ();
  G_UNLOCK (g_utils_global);
  
  return g_user_name;
}

G_CONST_RETURN gchar*
g_get_real_name (void)
{
  G_LOCK (g_utils_global);
  if (!g_tmp_dir)
    g_get_any_init ();
  G_UNLOCK (g_utils_global);
 
  return g_real_name;
}

/* Return the home directory of the user. If there is a HOME
 * environment variable, its value is returned, otherwise use some
 * system-dependent way of finding it out. If no home directory can be
 * deduced, return NULL.
 */

G_CONST_RETURN gchar*
g_get_home_dir (void)
{
  G_LOCK (g_utils_global);
  if (!g_tmp_dir)
    g_get_any_init ();
  G_UNLOCK (g_utils_global);
  
  return g_home_dir;
}

/* Return a directory to be used to store temporary files. This is the
 * value of the TMPDIR, TMP or TEMP environment variables (they are
 * checked in that order). If none of those exist, use P_tmpdir from
 * stdio.h.  If that isn't defined, return "/tmp" on POSIXly systems,
 * and C:\ on Windows.
 */

G_CONST_RETURN gchar*
g_get_tmp_dir (void)
{
  G_LOCK (g_utils_global);
  if (!g_tmp_dir)
    g_get_any_init ();
  G_UNLOCK (g_utils_global);
  
  return g_tmp_dir;
}

G_LOCK_DEFINE (g_prgname);
static gchar *g_prgname = NULL;

gchar*
g_get_prgname (void)
{
  gchar* retval;

  G_LOCK (g_prgname);
  retval = g_prgname;
  G_UNLOCK (g_prgname);

  return retval;
}

void
g_set_prgname (const gchar *prgname)
{
  G_LOCK (g_prgname);
  g_free (g_prgname);
  g_prgname = g_strdup (prgname);
  G_UNLOCK (g_prgname);
}

guint
g_direct_hash (gconstpointer v)
{
  return GPOINTER_TO_UINT (v);
}

gboolean
g_direct_equal (gconstpointer v1,
		gconstpointer v2)
{
  return v1 == v2;
}

gboolean
g_int_equal (gconstpointer v1,
	     gconstpointer v2)
{
  return *((const gint*) v1) == *((const gint*) v2);
}

guint
g_int_hash (gconstpointer v)
{
  return *(const gint*) v;
}

/**
 * g_nullify_pointer:
 * @nullify_location: the memory address of the pointer.
 * 
 * Set the pointer at the specified location to %NULL.
 **/
void
g_nullify_pointer (gpointer *nullify_location)
{
  g_return_if_fail (nullify_location != NULL);

  *nullify_location = NULL;
}

/**
 * g_get_codeset:
 * 
 * Get the codeset for the current locale.
 * 
 * Return value: a newly allocated string containing the name
 * of the codeset. This string must be freed with g_free().
 **/
gchar *
g_get_codeset (void)
{
#ifdef HAVE_CODESET  
  char *result = nl_langinfo (CODESET);
  return g_strdup (result);
#else
#ifdef G_PLATFORM_WIN32
  return g_strdup_printf ("CP%d", GetACP ());
#else
  /* FIXME: Do something more intelligent based on setlocale (LC_CTYPE, NULL)
   */
  return g_strdup ("ISO-8859-1");
#endif
#endif
}

#ifdef ENABLE_NLS

#include <libintl.h>

#ifdef G_PLATFORM_WIN32

G_WIN32_DLLMAIN_FOR_DLL_NAME (static, dll_name)

static const gchar *
_glib_get_locale_dir (void)
{
  static const gchar *cache = NULL;
  if (cache == NULL)
    cache = g_win32_get_package_installation_subdirectory
      (GETTEXT_PACKAGE, dll_name, "lib\\locale");

  return cache;
}

#undef GLIB_LOCALE_DIR
#define GLIB_LOCALE_DIR _glib_get_locale_dir ()

#endif /* G_PLATFORM_WIN32 */

G_CONST_RETURN gchar *
_glib_gettext (const gchar *str)
{
  static gboolean _glib_gettext_initialized = FALSE;

  if (!_glib_gettext_initialized)
    {
      bindtextdomain(GETTEXT_PACKAGE, GLIB_LOCALE_DIR);
#    ifdef HAVE_BIND_TEXTDOMAIN_CODESET
      bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
#    endif
      _glib_gettext_initialized = TRUE;
    }
  
  return dgettext (GETTEXT_PACKAGE, str);
}

#endif /* ENABLE_NLS */