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/**************************************************************************** * * * GNAT COMPILER COMPONENTS * * * * S Y S D E P * * * * C Implementation File * * * * Copyright (C) 1992-2009, Free Software Foundation, Inc. * * * * GNAT is free software; you can redistribute it and/or modify it under * * terms of the GNU General Public License as published by the Free Soft- * * ware Foundation; either version 3, or (at your option) any later ver- * * sion. GNAT is distributed in the hope that it will be useful, but WITH- * * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * * or FITNESS FOR A PARTICULAR PURPOSE. * * * * As a special exception under Section 7 of GPL version 3, you are granted * * additional permissions described in the GCC Runtime Library Exception, * * version 3.1, as published by the Free Software Foundation. * * * * You should have received a copy of the GNU General Public License and * * a copy of the GCC Runtime Library Exception along with this program; * * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see * * <http://www.gnu.org/licenses/>. * * * * GNAT was originally developed by the GNAT team at New York University. * * Extensive contributions were provided by Ada Core Technologies Inc. * * * ****************************************************************************/ /* This file contains system dependent symbols that are referenced in the GNAT Run Time Library */ #ifdef __vxworks #include "ioLib.h" #if ! defined (__VXWORKSMILS__) #include "dosFsLib.h" #endif #if ! defined (__RTP__) && (! defined (VTHREADS) || defined (__VXWORKSMILS__)) # include "nfsLib.h" #endif #include "selectLib.h" #include "vxWorks.h" #endif #ifdef IN_RTS #define POSIX #include "tconfig.h" #include "tsystem.h" #include <fcntl.h> #include <sys/stat.h> #ifdef VMS #include <unixio.h> #endif #else #include "config.h" #include "system.h" #endif #include <time.h> #include <errno.h> #if defined (sun) && defined (__SVR4) && !defined (__vxworks) /* The declaration is present in <time.h> but conditionalized on a couple of macros we don't define. */ extern struct tm *localtime_r(const time_t *, struct tm *); #endif #include "adaint.h" /* mode_read_text open text file for reading rt for DOS and Windows NT, r for Unix mode_write_text truncate to zero length or create text file for writing wt for DOS and Windows NT, w for Unix mode_append_text append; open or create text file for writing at end-of-file at for DOS and Windows NT, a for Unix mode_read_binary open binary file for reading rb for DOS and Windows NT, r for Unix mode_write_binary truncate to zero length or create binary file for writing wb for DOS and Windows NT, w for Unix mode_append_binary append; open or create binary file for writing at end-of-file ab for DOS and Windows NT, a for Unix mode_read_text_plus open text file for update (reading and writing) r+t for DOS and Windows NT, r+ for Unix mode_write_text_plus truncate to zero length or create text file for update w+t for DOS and Windows NT, w+ for Unix mode_append_text_plus append; open or create text file for update, writing at end-of-file a+t for DOS and Windows NT, a+ for Unix mode_read_binary_plus open binary file for update (reading and writing) r+b for DOS and Windows NT, r+ for Unix mode_write_binary_plus truncate to zero length or create binary file for update w+b for DOS and Windows NT, w+ for Unix mode_append_binary_plus append; open or create binary file for update, writing at end-of-file a+b for DOS and Windows NT, a+ for Unix Notes: (1) Opening a file with read mode fails if the file does not exist or cannot be read. (2) Opening a file with append mode causes all subsequent writes to the file to be forced to the then current end-of-file, regardless of intervening calls to the fseek function. (3) When a file is opened with update mode, both input and output may be performed on the associated stream. However, output may not be directly followed by input without an intervening call to the fflush function or to a file positioning function (fseek, fsetpos, or rewind), and input may not be directly followed by output without an intervening call to a file positioning function, unless the input operation encounters end-of-file. The other target dependent declarations here are for the two functions __gnat_set_binary_mode and __gnat_set_text_mode: void __gnat_set_binary_mode (int handle); void __gnat_set_text_mode (int handle); These functions have no effect in Unix (or similar systems where there is no distinction between binary and text files), but in DOS (and similar systems where text mode does CR/LF translation), these functions allow the mode of the stream with the given handle (fileno can be used to get the handle of a stream) to be changed dynamically. The returned result is 0 if no error occurs and -1 if an error occurs. Finally there is a boolean (character) variable char __gnat_text_translation_required; which is zero (false) in Unix mode, and one (true) in DOS mode, with a true value indicating that text translation is required on text files and that fopen supports the trailing t and b modifiers. */ #if defined(WINNT) || defined (MSDOS) || defined (__EMX__) static const char *mode_read_text = "rt"; static const char *mode_write_text = "wt"; static const char *mode_append_text = "at"; static const char *mode_read_binary = "rb"; static const char *mode_write_binary = "wb"; static const char *mode_append_binary = "ab"; static const char *mode_read_text_plus = "r+t"; static const char *mode_write_text_plus = "w+t"; static const char *mode_append_text_plus = "a+t"; static const char *mode_read_binary_plus = "r+b"; static const char *mode_write_binary_plus = "w+b"; static const char *mode_append_binary_plus = "a+b"; const char __gnat_text_translation_required = 1; void __gnat_set_binary_mode (int handle) { _setmode (handle, O_BINARY); } void __gnat_set_text_mode (int handle) { _setmode (handle, O_TEXT); } #ifdef __MINGW32__ #include <windows.h> /* Return the name of the tty. Under windows there is no name for the tty, so this function, if connected to a tty, returns the generic name "console". */ char * __gnat_ttyname (int filedes) { if (isatty (filedes)) return "console"; else return NULL; } /* This function is needed to fix a bug under Win95/98. Under these platforms doing : ch1 = getch(); ch2 = fgetc (stdin); will put the same character into ch1 and ch2. It seem that the character read by getch() is not correctly removed from the buffer. Even a fflush(stdin) does not fix the bug. This bug does not appear under Window NT. So we have two version of this routine below one for 95/98 and one for NT/2000 version of Windows. There is also a special routine (winflushinit) that will be called only the first time to check which version of Windows we are running running on to set the right routine to use. This problem occurs when using Text_IO.Get_Line after Text_IO.Get_Immediate for example. Calling FlushConsoleInputBuffer just after getch() fix the bug under 95/98. */ #ifdef RTX static void winflush_nt (void); /* winflush_function will do nothing since we only have problems with Windows 95/98 which are not supported by RTX. */ static void (*winflush_function) (void) = winflush_nt; static void winflush_nt (void) { /* Does nothing as there is no problem under NT. */ } #else static void winflush_init (void); static void winflush_95 (void); static void winflush_nt (void); int __gnat_is_windows_xp (void); /* winflusfunction is set first to the winflushinit function which will check the OS version 95/98 or NT/2000 */ static void (*winflush_function) (void) = winflush_init; /* This function does the runtime check of the OS version and then sets winflush_function to the appropriate function and then call it. */ static void winflush_init (void) { DWORD dwVersion = GetVersion(); if (dwVersion < 0x80000000) /* Windows NT/2000 */ winflush_function = winflush_nt; else /* Windows 95/98 */ winflush_function = winflush_95; (*winflush_function)(); /* Perform the 'flush' */ } static void winflush_95 (void) { FlushConsoleInputBuffer (GetStdHandle (STD_INPUT_HANDLE)); } static void winflush_nt (void) { /* Does nothing as there is no problem under NT. */ } int __gnat_is_windows_xp (void) { static int is_win_xp=0, is_win_xp_checked=0; if (!is_win_xp_checked) { OSVERSIONINFO version; is_win_xp_checked = 1; memset (&version, 0, sizeof (version)); version.dwOSVersionInfoSize = sizeof (version); is_win_xp = GetVersionEx (&version) && version.dwPlatformId == VER_PLATFORM_WIN32_NT && (version.dwMajorVersion > 5 || (version.dwMajorVersion == 5 && version.dwMinorVersion >= 1)); } return is_win_xp; } #endif #endif #else static const char *mode_read_text = "r"; static const char *mode_write_text = "w"; static const char *mode_append_text = "a"; static const char *mode_read_binary = "r"; static const char *mode_write_binary = "w"; static const char *mode_append_binary = "a"; static const char *mode_read_text_plus = "r+"; static const char *mode_write_text_plus = "w+"; static const char *mode_append_text_plus = "a+"; static const char *mode_read_binary_plus = "r+"; static const char *mode_write_binary_plus = "w+"; static const char *mode_append_binary_plus = "a+"; const char __gnat_text_translation_required = 0; /* These functions do nothing in non-DOS systems. */ void __gnat_set_binary_mode (int handle ATTRIBUTE_UNUSED) { } void __gnat_set_text_mode (int handle ATTRIBUTE_UNUSED) { } char * __gnat_ttyname (int filedes) { #if defined (__vxworks) || defined (__nucleus) return ""; #else extern char *ttyname (int); return ttyname (filedes); #endif /* defined (__vxworks) || defined (__nucleus) */ } #endif #if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \ || (defined (__osf__) && ! defined (__alpha_vxworks)) || defined (WINNT) \ || defined (__MACHTEN__) || defined (__hpux__) || defined (_AIX) \ || (defined (__svr4__) && defined (i386)) || defined (__Lynx__) \ || defined (__CYGWIN__) || defined (__FreeBSD__) || defined (__OpenBSD__) \ || defined (__GLIBC__) || defined (__APPLE__) #ifdef __MINGW32__ #if OLD_MINGW #include <termios.h> #else #include <conio.h> /* for getch(), kbhit() */ #endif #else #include <termios.h> #endif #else #if defined (VMS) extern char *decc$ga_stdscr; static int initted = 0; #endif #endif /* Implements the common processing for getc_immediate and getc_immediate_nowait. */ extern void getc_immediate (FILE *, int *, int *); extern void getc_immediate_nowait (FILE *, int *, int *, int *); extern void getc_immediate_common (FILE *, int *, int *, int *, int); /* Called by Get_Immediate (Foo); */ void getc_immediate (FILE *stream, int *ch, int *end_of_file) { int avail; getc_immediate_common (stream, ch, end_of_file, &avail, 1); } /* Called by Get_Immediate (Foo, Available); */ void getc_immediate_nowait (FILE *stream, int *ch, int *end_of_file, int *avail) { getc_immediate_common (stream, ch, end_of_file, avail, 0); } /* Called by getc_immediate () and getc_immediate_nowait () */ void getc_immediate_common (FILE *stream, int *ch, int *end_of_file, int *avail, int waiting) { #if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \ || (defined (__osf__) && ! defined (__alpha_vxworks)) \ || defined (__CYGWIN32__) || defined (__MACHTEN__) || defined (__hpux__) \ || defined (_AIX) || (defined (__svr4__) && defined (i386)) \ || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \ || defined (__GLIBC__) || defined (__APPLE__) char c; int nread; int good_one = 0; int eof_ch = 4; /* Ctrl-D */ int fd = fileno (stream); struct termios otermios_rec, termios_rec; if (isatty (fd)) { tcgetattr (fd, &termios_rec); memcpy (&otermios_rec, &termios_rec, sizeof (struct termios)); /* Set RAW mode, with no echo */ termios_rec.c_lflag = termios_rec.c_lflag & ~ICANON & ~ECHO; #if defined(linux) || defined (sun) || defined (sgi) || defined (__EMX__) \ || defined (__osf__) || defined (__MACHTEN__) || defined (__hpux__) \ || defined (_AIX) || (defined (__svr4__) && defined (i386)) \ || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \ || defined (__GLIBC__) || defined (__APPLE__) eof_ch = termios_rec.c_cc[VEOF]; /* If waiting (i.e. Get_Immediate (Char)), set MIN = 1 and wait for a character forever. This doesn't seem to effect Ctrl-Z or Ctrl-C processing except on OS/2 where Ctrl-C won't work right unless we do a read loop. Luckily we can delay a bit between iterations. If not waiting (i.e. Get_Immediate (Char, Available)), don't wait for anything but timeout immediately. */ #ifdef __EMX__ termios_rec.c_cc[VMIN] = 0; termios_rec.c_cc[VTIME] = waiting; #else termios_rec.c_cc[VMIN] = waiting; termios_rec.c_cc[VTIME] = 0; #endif #endif tcsetattr (fd, TCSANOW, &termios_rec); while (! good_one) { /* Read is used here instead of fread, because fread doesn't work on Solaris5 and Sunos4 in this situation. Maybe because we are mixing calls that use file descriptors and streams. */ nread = read (fd, &c, 1); if (nread > 0) { /* On Unix terminals, Ctrl-D (EOT) is an End of File. */ if (c == eof_ch) { *avail = 0; *end_of_file = 1; good_one = 1; } /* Everything else is ok */ else if (c != eof_ch) { *avail = 1; *end_of_file = 0; good_one = 1; } } else if (! waiting) { *avail = 0; *end_of_file = 0; good_one = 1; } else good_one = 0; } tcsetattr (fd, TCSANOW, &otermios_rec); *ch = c; } else #elif defined (VMS) int fd = fileno (stream); if (isatty (fd)) { if (initted == 0) { decc$bsd_initscr (); initted = 1; } decc$bsd_cbreak (); *ch = decc$bsd_wgetch (decc$ga_stdscr); if (*ch == 4) *end_of_file = 1; else *end_of_file = 0; *avail = 1; decc$bsd_nocbreak (); } else #elif defined (__MINGW32__) int fd = fileno (stream); int char_waiting; int eot_ch = 4; /* Ctrl-D */ if (isatty (fd)) { if (waiting) { *ch = getch (); (*winflush_function) (); if (*ch == eot_ch) *end_of_file = 1; else *end_of_file = 0; *avail = 1; } else /* ! waiting */ { char_waiting = kbhit(); if (char_waiting == 1) { *avail = 1; *ch = getch (); (*winflush_function) (); if (*ch == eot_ch) *end_of_file = 1; else *end_of_file = 0; } else { *avail = 0; *end_of_file = 0; } } } else #elif defined (__vxworks) /* Bit masks of file descriptors to read from. */ struct fd_set readFds; /* Timeout before select returns if nothing can be read. */ struct timeval timeOut; char c; int fd = fileno (stream); int nread; int option; int readable; int status; int width; if (isatty (fd)) { /* If we do not want to wait, we have to set up fd in RAW mode. This should be done outside this function as setting fd in RAW mode under vxWorks flushes the buffer of fd. If the RAW mode was set here, the buffer would be empty and we would always return that no character is available */ if (! waiting) { /* Initialization of timeOut for its use with select. */ timeOut.tv_sec = 0; timeOut.tv_usec = 0; /* Initialization of readFds for its use with select; FD is the only file descriptor to be monitored */ FD_ZERO (&readFds); FD_SET (fd, &readFds); width = 2; /* We do all this processing to emulate a non blocking read. */ readable = select (width, &readFds, NULL, NULL, &timeOut); if (readable == ERROR) *avail = -1, *end_of_file = -1; /* No character available in input. */ else if (readable == 0) *avail = 0, *end_of_file = 0; else { nread = read (fd, &c, 1); if (nread > 0) *avail = 1, *end_of_file = 0; /* End Of File. */ else if (nread == 0) *avail = 0, *end_of_file = 1; /* Error. */ else *avail = -1, *end_of_file = -1; } } /* We have to wait until we get a character */ else { *avail = -1; *end_of_file = -1; /* Save the current mode of FD. */ option = ioctl (fd, FIOGETOPTIONS, 0); /* Set FD in RAW mode. */ status = ioctl (fd, FIOSETOPTIONS, OPT_RAW); if (status != -1) { nread = read (fd, &c, 1); if (nread > 0) *avail = 1, *end_of_file = 0; /* End of file. */ else if (nread == 0) *avail = 0, *end_of_file = 1; /* Else there is an ERROR. */ } /* Revert FD to its previous mode. */ status = ioctl (fd, FIOSETOPTIONS, option); } *ch = c; } else #endif { /* If we're not on a terminal, then we don't need any fancy processing. Also this is the only thing that's left if we're not on one of the supported systems; which means that for non supported systems, get_immediate may wait for a carriage return on terminals. */ *ch = fgetc (stream); if (feof (stream)) { *end_of_file = 1; *avail = 0; } else { *end_of_file = 0; *avail = 1; } } } /* The following definitions are provided in NT to support Windows based Ada programs. */ #ifdef WINNT #include <windows.h> /* Provide functions to echo the values passed to WinMain (windows bindings will want to import these). We use the same names as the routines used by AdaMagic for compatibility. */ char *rts_get_hInstance (void); char *rts_get_hPrevInstance (void); char *rts_get_lpCommandLine (void); int rts_get_nShowCmd (void); char * rts_get_hInstance (void) { return (char *)GetModuleHandleA (0); } char * rts_get_hPrevInstance (void) { return 0; } char * rts_get_lpCommandLine (void) { return GetCommandLineA (); } int rts_get_nShowCmd (void) { return 1; } #endif /* WINNT */ #ifdef VMS /* This gets around a problem with using the old threads library on VMS 7.0. */ extern long get_gmtoff (void); long get_gmtoff (void) { time_t t; struct tm *ts; t = time ((time_t) 0); ts = localtime (&t); return ts->tm_gmtoff; } #endif /* This value is returned as the time zone offset when a valid value cannot be determined. It is simply a bizarre value that will never occur. It is 3 days plus 73 seconds (offset is in seconds). */ long __gnat_invalid_tzoff = 259273; /* Definition of __gnat_localtime_r used by a-calend.adb */ #if defined (__EMX__) || defined (__MINGW32__) #ifdef CERT /* For the Cert run times on native Windows we use dummy functions for locking and unlocking tasks since we do not support multiple threads on this configuration (Cert run time on native Windows). */ void dummy (void) {} void (*Lock_Task) () = &dummy; void (*Unlock_Task) () = &dummy; #else #define Lock_Task system__soft_links__lock_task extern void (*Lock_Task) (void); #define Unlock_Task system__soft_links__unlock_task extern void (*Unlock_Task) (void); #endif /* Reentrant localtime for Windows and OS/2. */ extern void __gnat_localtime_tzoff (const time_t *, long *); static const unsigned long long w32_epoch_offset = 11644473600ULL; void __gnat_localtime_tzoff (const time_t *timer, long *off) { union { FILETIME ft_time; unsigned long long ull_time; } utc_time, local_time; SYSTEMTIME utc_sys_time, local_sys_time; TIME_ZONE_INFORMATION tzi; BOOL status = 1; DWORD tzi_status; (*Lock_Task) (); #ifdef RTX tzi_status = GetTimeZoneInformation (&tzi); *off = tzi.Bias; if (tzi_status == TIME_ZONE_ID_STANDARD) /* The system is operating in the range covered by the StandardDate member. */ *off = *off + tzi.StandardBias; else if (tzi_status == TIME_ZONE_ID_DAYLIGHT) /* The system is operating in the range covered by the DaylightDate member. */ *off = *off + tzi.DaylightBias; *off = *off * -60; #else /* First convert unix time_t structure to windows FILETIME format. */ utc_time.ull_time = ((unsigned long long) *timer + w32_epoch_offset) * 10000000ULL; tzi_status = GetTimeZoneInformation (&tzi); /* If GetTimeZoneInformation does not return a value between 0 and 2 then it means that we were not able to retrieve timezone informations. Note that we cannot use here FileTimeToLocalFileTime as Windows will use in always in this case the current timezone setting. As suggested on MSDN we use the following three system calls to get the right information. Note also that starting with Windows Vista new functions are provided to get timezone settings that depend on the year. We cannot use them as we still support Windows XP and Windows 2003. */ status = (tzi_status >= 0 && tzi_status <= 2) && FileTimeToSystemTime (&utc_time.ft_time, &utc_sys_time) && SystemTimeToTzSpecificLocalTime (&tzi, &utc_sys_time, &local_sys_time) && SystemTimeToFileTime (&local_sys_time, &local_time.ft_time); if (!status) /* An error occurs so return invalid_tzoff. */ *off = __gnat_invalid_tzoff; else if (local_time.ull_time > utc_time.ull_time) *off = (long) ((local_time.ull_time - utc_time.ull_time) / 10000000ULL); else *off = - (long) ((utc_time.ull_time - local_time.ull_time) / 10000000ULL); #endif (*Unlock_Task) (); } #else /* On Lynx, all time values are treated in GMT */ #if defined (__Lynx__) /* As of LynxOS 3.1.0a patch level 040, LynuxWorks changes the prototype to the C library function localtime_r from the POSIX.4 Draft 9 to the POSIX 1.c version. Before this change the following spec is required. Only use when ___THREADS_POSIX4ad4__ is defined, the Lynx convention when building against the legacy API. */ extern void __gnat_localtime_tzoff (const time_t *, long *); void __gnat_localtime_tzoff (const time_t *timer, long *off) { *off = 0; } #else /* VMS does not need __gnat_locatime_tzoff */ #if defined (VMS) /* Other targets except Lynx, VMS and Windows provide a standard locatime_r */ #else #define Lock_Task system__soft_links__lock_task extern void (*Lock_Task) (void); #define Unlock_Task system__soft_links__unlock_task extern void (*Unlock_Task) (void); extern void __gnat_localtime_tzoff (const time_t *, long *); void __gnat_localtime_tzoff (const time_t *timer, long *off) { struct tm tp; /* AIX, HPUX, SGI Irix, Sun Solaris */ #if defined (_AIX) || defined (__hpux__) || defined (sgi) || defined (sun) { (*Lock_Task) (); localtime_r (timer, &tp); *off = (long) -timezone; (*Unlock_Task) (); /* Correct the offset if Daylight Saving Time is in effect */ if (tp.tm_isdst > 0) *off = *off + 3600; } /* VxWorks */ #elif defined (__vxworks) #include <stdlib.h> { (*Lock_Task) (); localtime_r (timer, &tp); /* Try to read the environment variable TIMEZONE. The variable may not have been initialize, in that case return an offset of zero (0) for UTC. */ char *tz_str = getenv ("TIMEZONE"); if ((tz_str == NULL) || (*tz_str == '\0')) *off = 0; else { char *tz_start, *tz_end; /* The format of the data contained in TIMEZONE is N::U:S:E where N is the name of the time zone, U are the minutes difference from UTC, S is the start of DST in mmddhh and E is the end of DST in mmddhh. Extracting the value of U involves setting two pointers, one at the beginning and one at the end of the value. The end pointer is then set to null in order to delimit a string slice for atol to process. */ tz_start = index (tz_str, ':') + 2; tz_end = index (tz_start, ':'); tz_end = '\0'; /* The Ada layer expects an offset in seconds. Note that we must reverse the sign of the result since west is positive and east is negative on VxWorks targets. */ *off = -atol (tz_start) * 60; /* Correct the offset if Daylight Saving Time is in effect */ if (tp.tm_isdst > 0) *off = *off + 3600; } (*Unlock_Task) (); } /* Darwin, Free BSD, Linux, Tru64, where component tm_gmtoff is present in struct tm */ #elif defined (__APPLE__) || defined (__FreeBSD__) || defined (linux) ||\ (defined (__alpha__) && defined (__osf__)) || defined (__GLIBC__) { localtime_r (timer, &tp); *off = tp.tm_gmtoff; } /* Default: treat all time values in GMT */ #else *off = 0; #endif } #endif #endif #endif #ifdef __vxworks #include <taskLib.h> /* __gnat_get_task_options is used by s-taprop.adb only for VxWorks. This function returns the options to be set when creating a new task. It fetches the options assigned to the current task (parent), so offering some user level control over the options for a task hierarchy. It forces VX_FP_TASK because it is almost always required. On processors with the SPE category, VX_SPE_TASK is needed to enable the SPE. */ extern int __gnat_get_task_options (void); int __gnat_get_task_options (void) { int options; /* Get the options for the task creator */ taskOptionsGet (taskIdSelf (), &options); /* Force VX_FP_TASK because it is almost always required */ options |= VX_FP_TASK; #if defined (__SPE__) options |= VX_SPE_TASK; #endif /* Mask those bits that are not under user control */ #ifdef VX_USR_TASK_OPTIONS return options & VX_USR_TASK_OPTIONS; #else return options; #endif } #endif int __gnat_is_file_not_found_error (int errno_val) { switch (errno_val) { case ENOENT: #ifdef __vxworks /* In the case of VxWorks, we also have to take into account various * filesystem-specific variants of this error. */ #if ! defined (__VXWORKSMILS__) case S_dosFsLib_FILE_NOT_FOUND: #endif #if ! defined (__RTP__) && (! defined (VTHREADS) || defined (__VXWORKSMILS__)) case S_nfsLib_NFSERR_NOENT: #endif #endif return 1; default: return 0; } }