gmessages.c

嵌入式下基于MiniGUI的Web Browser

    case G_LOG_LEVEL_ERROR:
      strcpy (level_prefix, "ERROR");
      to_stdout = FALSE;
      break;
    case G_LOG_LEVEL_CRITICAL:
      strcpy (level_prefix, "CRITICAL");
      to_stdout = FALSE;
      break;
    case G_LOG_LEVEL_WARNING:
      strcpy (level_prefix, "WARNING");
      to_stdout = FALSE;
      break;
    case G_LOG_LEVEL_MESSAGE:
      strcpy (level_prefix, "Message");
      to_stdout = FALSE;
      break;
    case G_LOG_LEVEL_INFO:
      strcpy (level_prefix, "INFO");
      break;
    case G_LOG_LEVEL_DEBUG:
      strcpy (level_prefix, "DEBUG");
      break;
    default:
      if (log_level)
	{
	  strcpy (level_prefix, "LOG-");
	  format_unsigned (level_prefix + 4, log_level & G_LOG_LEVEL_MASK, 16);
	}
      else
	strcpy (level_prefix, "LOG");
      break;
    }
  if (log_level & G_LOG_FLAG_RECURSION)
    strcat (level_prefix, " (recursed)");
  if (log_level & ALERT_LEVELS)
    strcat (level_prefix, " **");

  ensure_stdout_valid ();
#ifdef G_OS_WIN32
  win32_keep_fatal_message = (log_level & G_LOG_FLAG_FATAL) != 0;
  /* Use just stdout as stderr is hard to get redirected from the DOS prompt. */
  return stdout;
#else
  return to_stdout ? 1 : 2;
#endif
}

void
_g_log_fallback_handler (const gchar   *log_domain,
			 GLogLevelFlags log_level,
			 const gchar   *message,
			 gpointer       unused_data)
{
  gchar level_prefix[STRING_BUFFER_SIZE], pid_string[FORMAT_UNSIGNED_BUFSIZE];
  gboolean is_fatal = (log_level & G_LOG_FLAG_FATAL) != 0;
  GFileDescriptor fd;

  /* we can not call _any_ GLib functions in this fallback handler,
   * which is why we skip UTF-8 conversion, etc.
   * since we either recursed or ran out of memory, we're in a pretty
   * pathologic situation anyways, what we can do is giving the
   * the process ID unconditionally however.
   */

  fd = mklevel_prefix (level_prefix, log_level);
  if (!message)
    message = "(NULL) message";

  format_unsigned (pid_string, getpid (), 10);

  if (log_domain)
    write_string (fd, "\n");
  else
    write_string (fd, "\n** ");
  write_string (fd, "(process:");
  write_string (fd, pid_string);
  write_string (fd, "): ");
  if (log_domain)
    {
      write_string (fd, log_domain);
      write_string (fd, "-");
    }
  write_string (fd, level_prefix);
  write_string (fd, ": ");
  write_string (fd, message);
  if (is_fatal)
    write_string (fd, "\naborting...\n");
  else
    write_string (fd, "\n");
}

void
g_log_default_handler (const gchar   *log_domain,
		       GLogLevelFlags log_level,
		       const gchar   *message,
		       gpointer	      unused_data)
{
  gboolean is_fatal = (log_level & G_LOG_FLAG_FATAL) != 0;
  gchar level_prefix[STRING_BUFFER_SIZE], *string;
  GString *gstring;
  GFileDescriptor fd;

  /* we can be called externally with recursion for whatever reason */
  if (log_level & G_LOG_FLAG_RECURSION)
    {
      _g_log_fallback_handler (log_domain, log_level, message, unused_data);
      return;
    }

  g_messages_prefixed_init ();

  fd = mklevel_prefix (level_prefix, log_level);

  gstring = g_string_new ("");
  if (log_level & ALERT_LEVELS)
    g_string_append (gstring, "\n");
  if (!log_domain)
    g_string_append (gstring, "** ");

  if ((g_log_msg_prefix & log_level) == log_level)
    {
      const gchar *prg_name = g_get_prgname ();
      
      if (!prg_name)
	g_string_append_printf (gstring, "(process:%lu): ", (gulong)getpid ());
      else
	g_string_append_printf (gstring, "(%s:%lu): ", prg_name, (gulong)getpid ());
    }

  if (log_domain)
    {
      g_string_append (gstring, log_domain);
      g_string_append_c (gstring, '-');
    }
  g_string_append (gstring, level_prefix);

  g_string_append (gstring, ": ");
  if (!message)
    g_string_append (gstring, "(NULL) message");
  else
    {
#if 0
      const gchar *charset;

      if (g_get_charset (&charset))
	g_string_append (gstring, message);	/* charset is UTF-8 already */
      else
	{
	  string = strdup_convert (message, charset);
	  g_string_append (gstring, string);
	  g_free (string);
	}
#else
      g_string_append (gstring, message);
#endif
    }
  if (is_fatal)
    g_string_append (gstring, "\naborting...\n");
  else
    g_string_append (gstring, "\n");

  string = g_string_free (gstring, FALSE);

  write_string (fd, string);
  g_free (string);
}

GPrintFunc
g_set_print_handler (GPrintFunc func)
{
  GPrintFunc old_print_func;
  
  g_mutex_lock (g_messages_lock);
  old_print_func = glib_print_func;
  glib_print_func = func;
  g_mutex_unlock (g_messages_lock);
  
  return old_print_func;
}

void
g_print (const gchar *format,
	 ...)
{
  va_list args;
  gchar *string;
  GPrintFunc local_glib_print_func;
  
  g_return_if_fail (format != NULL);
  
  va_start (args, format);
  string = g_strdup_vprintf (format, args);
  va_end (args);
  
  g_mutex_lock (g_messages_lock);
  local_glib_print_func = glib_print_func;
  g_mutex_unlock (g_messages_lock);
  
  if (local_glib_print_func)
    local_glib_print_func (string);
  else
    {
      ensure_stdout_valid ();
#if 0
      const gchar *charset;

      if (g_get_charset (&charset))
	fputs (string, stdout); /* charset is UTF-8 already */
      else
	{
	  gchar *lstring = strdup_convert (string, charset);

	  fputs (lstring, stdout);
	  g_free (lstring);
	}
#else
      fputs (string, stdout);
#endif
      fflush (stdout);
    }
  g_free (string);
}

GPrintFunc
g_set_printerr_handler (GPrintFunc func)
{
  GPrintFunc old_printerr_func;
  
  g_mutex_lock (g_messages_lock);
  old_printerr_func = glib_printerr_func;
  glib_printerr_func = func;
  g_mutex_unlock (g_messages_lock);
  
  return old_printerr_func;
}

void
g_printerr (const gchar *format,
	    ...)
{
  va_list args;
  gchar *string;
  GPrintFunc local_glib_printerr_func;
  
  g_return_if_fail (format != NULL);
  
  va_start (args, format);
  string = g_strdup_vprintf (format, args);
  va_end (args);
  
  g_mutex_lock (g_messages_lock);
  local_glib_printerr_func = glib_printerr_func;
  g_mutex_unlock (g_messages_lock);
  
  if (local_glib_printerr_func)
    local_glib_printerr_func (string);
  else
    {
#if 0
      const gchar *charset;

      if (g_get_charset (&charset))
	fputs (string, stderr); /* charset is UTF-8 already */
      else
	{
	  gchar *lstring = strdup_convert (string, charset);

	  fputs (lstring, stderr);
	  g_free (lstring);
	}
#else
      fputs (string, stderr); /* charset is UTF-8 already */
#endif
      fflush (stderr);
    }
  g_free (string);
}

#ifndef MB_LEN_MAX
#  define MB_LEN_MAX 8
#endif

#ifndef HAVE_C99_VSNPRINTF

typedef struct
{
  guint min_width;
  guint precision;
  gboolean alternate_format, zero_padding, adjust_left, locale_grouping;
  gboolean add_space, add_sign, possible_sign, seen_precision;
  gboolean mod_half, mod_long, mod_extra_long;
} PrintfArgSpec;

static gsize
printf_string_upper_bound (const gchar *format,
			   gboolean     may_warn,
			   va_list      args)
{
  static const gboolean honour_longs = SIZEOF_LONG > 4 || SIZEOF_VOID_P > 4;
  gsize len = 1;
  
  if (!format)
    return len;
  
  while (*format)
    {
      register gchar c = *format++;
      
      if (c != '%')
	len += 1;
      else /* (c == '%') */
	{
	  PrintfArgSpec spec = { 0, };
	  gboolean seen_l = FALSE, conv_done = FALSE;
	  gsize conv_len = 0;
	  const gchar *spec_start = format;
	  
	  do
	    {
	      c = *format++;
	      switch (c)
		{
		  GDoubleIEEE754 u_double;
		  guint v_uint;
		  gint v_int;
		  const gchar *v_string;
		  
		  /* beware of positional parameters
		   */
		case '$':
		  if (may_warn)
		    g_warning (G_GNUC_PRETTY_FUNCTION
			       "(): unable to handle positional parameters (%%n$)");
		  len += 1024; /* try adding some safety padding */
		  conv_done = TRUE;
		  break;
		  
		  /* parse flags
		   */
		case '#':
		  spec.alternate_format = TRUE;
		  break;
		case '0':
		  spec.zero_padding = TRUE;
		  break;
		case '-':
		  spec.adjust_left = TRUE;
		  break;
		case ' ':
		  spec.add_space = TRUE;
		  break;
		case '+':
		  spec.add_sign = TRUE;
		  break;
		case '\'':
		  spec.locale_grouping = TRUE;
		  break;
		  
		  /* parse output size specifications
		   */
		case '.':
		  spec.seen_precision = TRUE;
		  break;
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':
		  v_uint = c - '0';
		  c = *format;
		  while (c >= '0' && c <= '9')
		    {
		      format++;
		      v_uint = v_uint * 10 + c - '0';
		      c = *format;
		    }
		  if (spec.seen_precision)
		    spec.precision = MAX (spec.precision, v_uint);
		  else
		    spec.min_width = MAX (spec.min_width, v_uint);
		  break;
		case '*':
		  v_int = va_arg (args, int);
		  if (spec.seen_precision)
		    {
		      /* forget about negative precision */
		      if (v_int >= 0)
			spec.precision = MAX (spec.precision, v_int);
		    }
		  else
		    {
		      if (v_int < 0)
			{
			  v_int = - v_int;
			  spec.adjust_left = TRUE;
			}
		      spec.min_width = MAX (spec.min_width, v_int);
		    }
		  break;
		  
		  /* parse type modifiers
		   */
		case 'h':
		  spec.mod_half = TRUE;
		  break;
		case 'l':
		  if (!seen_l)
		    {
		      spec.mod_long = TRUE;
		      seen_l = TRUE;
		      break;
		    }
		  /* else, fall through */
		case 'L':
		case 'q':
		  spec.mod_long = TRUE;
		  spec.mod_extra_long = TRUE;
		  break;
		case 'z':
		case 'Z':
#if GLIB_SIZEOF_SIZE_T > 4
		  spec.mod_long = TRUE;
		  spec.mod_extra_long = TRUE;
#endif /* GLIB_SIZEOF_SIZE_T > 4 */
		  break;
		case 't':
#if GLIB_SIZEOF_PTRDIFF_T > 4
		  spec.mod_long = TRUE;
		  spec.mod_extra_long = TRUE;
#endif /* GLIB_SIZEOF_PTRDIFF_T > 4 */
		  break;
		case 'j':
#if GLIB_SIZEOF_INTMAX_T > 4
		  spec.mod_long = TRUE;
		  spec.mod_extra_long = TRUE;
#endif /* GLIB_SIZEOF_INTMAX_T > 4 */
		  break;
		  
		  /* parse output conversions
		   */
		case '%':
		  conv_len += 1;
		  break;
		case 'O':
		case 'D':
		case 'I':
		case 'U':
		  /* some C libraries feature long variants for these as well? */
		  spec.mod_long = TRUE;
		  /* fall through */
		case 'o':
		  conv_len += 2;
		  /* fall through */
		case 'd':
		case 'i':
		  conv_len += 1; /* sign */
		  /* fall through */
		case 'u':
		  conv_len += 4;
		  /* fall through */
		case 'x':
		case 'X':
		  spec.possible_sign = TRUE;
		  conv_len += 10;
		  if (spec.mod_long && honour_longs)
		    conv_len *= 2;
		  if (spec.mod_extra_long)
		    conv_len *= 2;
		  if (spec.mod_extra_long)
		    {
		      (void) va_arg (args, gint64);
		    }
		  else if (spec.mod_long)
		    (void) va_arg (args, long);
		  else
		    (void) va_arg (args, int);
		  break;
		case 'A':
		case 'a':
		  /*          0x */
		  conv_len += 2;
		  /* fall through */
		case 'g':
		case 'G':
		case 'e':
		case 'E':
		case 'f':
		  spec.possible_sign = TRUE;
		  /*          n   .   dddddddddddddddddddddddd   E   +-  eeee */
		  conv_len += 1 + 1 + MAX (24, spec.precision) + 1 + 1 + 4;
                  if (may_warn && spec.mod_extra_long)
		    g_warning (G_GNUC_PRETTY_FUNCTION
			       "(): unable to handle long double, collecting double only");
#ifdef HAVE_LONG_DOUBLE
#error need to implement special handling for long double
#endif
		  u_double.v_double = va_arg (args, double);
		  /* %f can expand up to all significant digits before '.' (308) */
		  if (c == 'f' &&
		      u_double.mpn.biased_exponent > 0 && u_double.mpn.biased_exponent < 2047)
		    {
		      gint exp = u_double.mpn.biased_exponent;
		      
		      exp -= G_IEEE754_DOUBLE_BIAS;
		      exp = exp * G_LOG_2_BASE_10 + 1;
		      conv_len += ABS (exp);	/* exp can be <0 */
		    }
		  /* some printf() implementations require extra padding for rounding */
		  conv_len += 2;
		  /* we can't really handle locale specific grouping here */
		  if (spec.locale_grouping)
		    conv_len *= 2;
		  break;
		case 'C':
		  spec.mod_long = TRUE;
                  /* fall through */
		case 'c':
		  conv_len += spec.mod_long ? MB_LEN_MAX : 1;
		  (void) va_arg (args, int);
		  break;
		case 'S':
		  spec.mod_long = TRUE;
		  /* fall through */
		case 's':
		  v_string = va_arg (args, char*);
		  if (!v_string)
		    conv_len += 8; /* hold "(null)" */
		  else if (spec.seen_precision)
		    conv_len += spec.precision;
		  else
		    conv_len += strlen (v_string);
		  conv_done = TRUE;
		  if (spec.mod_long)
		    {
		      if (may_warn)
			g_warning (G_GNUC_PRETTY_FUNCTION
				   "(): unable to handle wide char strings");
		      len += 1024; /* try adding some safety padding */
		    }
		  break;
		case 'P': /* do we actually need this? */
		  /* fall through */
		case 'p':
		  spec.alternate_format = TRUE;
		  conv_len += 10;
		  if (honour_longs)
		    conv_len *= 2;
		  /* fall through */
		case 'n':
		  conv_done = TRUE;
		  (void) va_arg (args, void*);
		  break;
		case 'm':
		  /* there's not much we can do to be clever */
		  v_string = g_strerror (errno);
		  v_uint = v_string ? strlen (v_string) : 0;
		  conv_len += MAX (256, v_uint);
		  break;
		  
		  /* handle invalid cases
		   */
		case '\000':
		  /* no conversion specification, bad bad */
		  conv_len += format - spec_start;
		  break;
		default:
		  if (may_warn)
		    g_warning (G_GNUC_PRETTY_FUNCTION
			       "(): unable to handle `%c' while parsing format",
			       c);
		  break;
		}
	      conv_done |= conv_len > 0;
	    }
	  while (!conv_done);
	  /* handle width specifications */
	  conv_len = MAX (conv_len, MAX (spec.precision, spec.min_width));
	  /* handle flags */
	  conv_len += spec.alternate_format ? 2 : 0;
	  conv_len += (spec.add_space || spec.add_sign || spec.possible_sign);
	  /* finally done */
	  len += conv_len;
	} /* else (c == '%') */
    } /* while (*format) */
  
  return len;
}

#endif /* !HAVE_C99_VSNPRINTF */


gsize
g_printf_string_upper_bound (const gchar *format,
			     va_list      args)
{
#if HAVE_C99_VSNPRINTF
  gchar c;
  return vsnprintf (&c, 1, format, args) + 1;
#else
  return printf_string_upper_bound (format, TRUE, args);
#endif
}

void
g_messages_init (void)
{
  g_messages_lock = g_mutex_new ();
  g_log_depth = g_private_new (NULL);
  g_messages_prefixed_init ();
  _g_debug_init ();
}

gboolean _g_debug_initialized = FALSE;
guint _g_debug_flags = 0;

void
_g_debug_init (void) 
{
  const gchar *val;
  
  _g_debug_initialized = TRUE;
  
  val = g_getenv ("G_DEBUG");
  if (val != NULL)
    {
      static const GDebugKey keys[] = {
	{"fatal_warnings", G_DEBUG_FATAL_WARNINGS}
      };
      
      _g_debug_flags = g_parse_debug_string (val, keys, G_N_ELEMENTS (keys));
    }
  
  if (_g_debug_flags & G_DEBUG_FATAL_WARNINGS) 
    {
      GLogLevelFlags fatal_mask;
      
      fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
      fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
      g_log_set_always_fatal (fatal_mask);
    }
}