sldisply.c

一个C格式的脚本处理函数库源代码,可让你的C程序具有执行C格式的脚本文件

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/* Returns 0 if all goes well, -1 if terminal capabilities cannot be deduced,
 * or -2 if terminal cannot position the cursor.
 */
int SLtt_initialize (char *term)
{
   char *t, ch;
   int is_xterm;
   int almost_vtxxx;

   if (SLang_TT_Write_FD == -1)
     {
	/* Apparantly, this cannot fail according to the man pages. */
	SLang_TT_Write_FD = fileno (stdout);
     }
   
   if (term == NULL)
     {
	term = getenv ("TERM");
	if (term == NULL)
	  return -1;
     }

   if (_SLsecure_issetugid ()
       && ((term[0] == '.') || (NULL != strchr(term, '/'))))
     return -1;
   
   Linux_Console = (!strncmp (term, "linux", 5)
# ifdef linux
		    || !strncmp(term, "con", 3)
# endif
		    );

   t = term;

   if (strcmp(t, "vt52") && (*t++ == 'v') && (*t++ == 't')
       && (ch = *t, (ch >= '1') && (ch <= '9'))) Vt100_Like = 1;

   is_xterm = ((0 == strncmp (term, "xterm", 5))
	       || (0 == strncmp (term, "rxvt", 4))
	       || (0 == strncmp (term, "Eterm", 5)));

   almost_vtxxx = (Vt100_Like
		   || Linux_Console
		   || is_xterm
		   || !strcmp (term, "screen"));

# ifndef USE_TERMCAP
   if (NULL == (Terminfo = _SLtt_tigetent (term)))
     {
	if (almost_vtxxx) /* Special cases. */
	  {
	     int vt102 = 1;
	     if (!strcmp (term, "vt100")) vt102 = 0;
	     get_color_info ();
   	     SLtt_set_term_vtxxx (&vt102);
	     (void) SLtt_get_screen_size ();
	     return 0;
	  }
	return -1;
     }
# else				       /* USE_TERMCAP */
   if (1 != tgetent(Termcap_Buf, term))
     return -1;
   Termcap_String_Ptr = Termcap_String_Buf;
# endif				       /* NOT USE_TERMCAP */

   Termcap_Initalized = 1;

   Cls_Str = SLtt_tgetstr ("cl");
   Curs_Pos_Str = SLtt_tgetstr ("cm");

   if ((NULL == (Ins_Mode_Str = SLtt_tgetstr("im")))
       || ( NULL == (Eins_Mode_Str = SLtt_tgetstr("ei")))
       || ( NULL == (Del_Char_Str = SLtt_tgetstr("dc"))))
     SLtt_Term_Cannot_Insert = 1;

   Visible_Bell_Str = SLtt_tgetstr ("vb");
   Curs_Up_Str = SLtt_tgetstr ("up");
   Rev_Scroll_Str = SLtt_tgetstr("sr");
   Del_N_Lines_Str = SLtt_tgetstr("DL");
   Add_N_Lines_Str = SLtt_tgetstr("AL");

   /* Actually these are used to initialize terminals that use cursor
    * addressing.  Hard to believe.
    */
   Term_Init_Str = SLtt_tgetstr ("ti");
   Term_Reset_Str = SLtt_tgetstr ("te");

   /* If I do this for vtxxx terminals, arrow keys start sending ESC O A,
    * which I do not want.  This is mainly for HP terminals.
    */
   if ((almost_vtxxx == 0) || SLtt_Force_Keypad_Init)
     {
	Keypad_Init_Str = SLtt_tgetstr ("ks");
	Keypad_Reset_Str = SLtt_tgetstr ("ke");
     }

   /* Make up for defective termcap/terminfo databases */
   if ((Vt100_Like && (term[2] != '1'))
       || Linux_Console
       || is_xterm
       )
     {
	if (Del_N_Lines_Str == NULL) Del_N_Lines_Str = "\033[%dM";
	if (Add_N_Lines_Str == NULL) Add_N_Lines_Str = "\033[%dL";
     }

   Scroll_R_Str = SLtt_tgetstr("cs");

   SLtt_get_screen_size ();

   if ((Scroll_R_Str == NULL)
       || (((NULL == Del_N_Lines_Str) || (NULL == Add_N_Lines_Str))
	   && (NULL == Rev_Scroll_Str)))
     {
	if (is_xterm
	    || Linux_Console
	    )
	  {
	     /* Defective termcap mode!!!! */
	     SLtt_set_term_vtxxx (NULL);
	  }
	else SLtt_Term_Cannot_Scroll = 1;
     }

   Del_Eol_Str = SLtt_tgetstr("ce");
   Del_Bol_Str = SLtt_tgetstr("cb");
   if (is_xterm && (Del_Bol_Str == NULL))
     Del_Bol_Str = "\033[1K";
   if (is_xterm && (Del_Eol_Str == NULL))
     Del_Eol_Str = "\033[K";

   Rev_Vid_Str = SLtt_tgetstr("mr");
   if (Rev_Vid_Str == NULL) Rev_Vid_Str = SLtt_tgetstr("so");

   Bold_Vid_Str = SLtt_tgetstr("md");

   /* Although xterm cannot blink, it does display the blinking characters
    * as bold ones.  Some Rxvt will display the background as high intensity.
    */
   if ((NULL == (Blink_Vid_Str = SLtt_tgetstr("mb")))
       && is_xterm)
     Blink_Vid_Str = "\033[5m";

   UnderLine_Vid_Str = SLtt_tgetstr("us");

   Start_Alt_Chars_Str = SLtt_tgetstr ("as");   /* smacs */
   End_Alt_Chars_Str = SLtt_tgetstr ("ae");   /* rmacs */
   Enable_Alt_Char_Set = SLtt_tgetstr ("eA");   /* enacs */
   SLtt_Graphics_Char_Pairs = SLtt_tgetstr ("ac");

   if (NULL == SLtt_Graphics_Char_Pairs)
     {
	/* make up for defective termcap/terminfo */
	if (Vt100_Like)
	  {
	     Start_Alt_Chars_Str = "\016";
	     End_Alt_Chars_Str = "\017";
	     Enable_Alt_Char_Set = "\033)0";
	  }
     }

    /* aixterm added by willi */
   if (is_xterm || !strncmp (term, "aixterm", 7))
     {
	Start_Alt_Chars_Str = "\016";
	End_Alt_Chars_Str = "\017";
	Enable_Alt_Char_Set = "\033(B\033)0";
     }

   if ((SLtt_Graphics_Char_Pairs == NULL) &&
       ((Start_Alt_Chars_Str == NULL) || (End_Alt_Chars_Str == NULL)))
     {
	SLtt_Has_Alt_Charset = 0;
	Enable_Alt_Char_Set = NULL;
     }
   else SLtt_Has_Alt_Charset = 1;

#ifdef AMIGA
   Enable_Alt_Char_Set = Start_Alt_Chars_Str = End_Alt_Chars_Str = NULL;
#endif

   /* status line capabilities */
   if ((SLtt_Has_Status_Line == -1)
       && (0 != (SLtt_Has_Status_Line = TGETFLAG ("hs"))))
     {
	Disable_Status_line_Str = SLtt_tgetstr ("ds");
	Return_From_Status_Line_Str = SLtt_tgetstr ("fs");
	Goto_Status_Line_Str = SLtt_tgetstr ("ts");
	/* Status_Line_Esc_Ok = TGETFLAG("es"); */
	Num_Status_Line_Columns = SLtt_tgetnum ("ws");
	if (Num_Status_Line_Columns < 0) Num_Status_Line_Columns = 0;
     }

   if (NULL == (Norm_Vid_Str = SLtt_tgetstr("me")))
     {
	Norm_Vid_Str = SLtt_tgetstr("se");
     }

   Cursor_Invisible_Str = SLtt_tgetstr("vi");
   Cursor_Visible_Str = SLtt_tgetstr("ve");

   Curs_F_Str = SLtt_tgetstr("RI");

# if 0
   if (NULL != Curs_F_Str)
     {
	Len_Curs_F_Str = strlen(Curs_F_Str);
     }
   else Len_Curs_F_Str = strlen(Curs_Pos_Str);
# endif

   Automatic_Margins = TGETFLAG ("am");
   /* No_Move_In_Standout = !TGETFLAG ("ms"); */
# ifdef HP_GLITCH_CODE
   Has_HP_Glitch = TGETFLAG ("xs");
# else
   Worthless_Highlight = TGETFLAG ("xs");
# endif

   if (Worthless_Highlight == 0)
     {				       /* Magic cookie glitch */
	Worthless_Highlight = (SLtt_tgetnum ("sg") > 0);
     }

   if (Worthless_Highlight)
     SLtt_Has_Alt_Charset = 0;

   Reset_Color_String = SLtt_tgetstr ("op");
   
   /* Apparantly the difference between "AF" and "Sf" is that AF uses RGB, 
    * but Sf uses BGR.
    */
   Color_Fg_Str = SLtt_tgetstr ("AF"); /* ANSI setaf */
   if (Color_Fg_Str == NULL)
     {
	Color_Fg_Str = SLtt_tgetstr ("Sf");   /* setf */
	Is_Fg_BGR = (Color_Fg_Str != NULL);
     }
   Color_Bg_Str = SLtt_tgetstr ("AB"); /* ANSI setbf */
   if (Color_Bg_Str == NULL)
     {
	Color_Bg_Str = SLtt_tgetstr ("Sb");   /* setb */
	Is_Fg_BGR = (Color_Bg_Str != NULL);
     }

   if ((Max_Terminfo_Colors = SLtt_tgetnum ("Co")) < 0)
     Max_Terminfo_Colors = 8;

   if ((Color_Bg_Str != NULL) && (Color_Fg_Str != NULL))
     SLtt_Use_Ansi_Colors = 1;
   else
     {
#if 0
	Color_Fg_Str = "%?%p1%{7}%>%t\033[1;3%p1%{8}%m%dm%e\033[3%p1%dm%;";
	Color_Bg_Str = "%?%p1%{7}%>%t\033[5;4%p1%{8}%m%dm%e\033[4%p1%dm%;";
	Max_Terminfo_Colors = 16;
#else
	Color_Fg_Str = "\033[3%dm";
	Color_Bg_Str = "\033[4%dm";
	Max_Terminfo_Colors = 8;
#endif
     }

#if SLTT_HAS_NON_BCE_SUPPORT
   Can_Background_Color_Erase = TGETFLAG ("ut");   /* bce */
   /* Modern xterms have the BCE capability as well as the linux console */
   if (Can_Background_Color_Erase == 0)
     {
	Can_Background_Color_Erase = (Linux_Console
# if SLTT_XTERM_ALWAYS_BCE
				      || is_xterm
# endif
				      );
     }
#endif
   get_color_info ();

  
   if ((Cls_Str == NULL)
       || (Curs_Pos_Str == NULL))
     return -2;

   return 0;
}

#endif
/* Unix */

/* specific to vtxxx only */
void SLtt_enable_cursor_keys (void)
{
#ifdef __unix__
   if (Vt100_Like)
#endif
     tt_write_string("\033=\033[?1l");
}

#ifdef VMS
int SLtt_initialize (char *term)
{
   SLtt_get_terminfo ();
   return 0;
}

void SLtt_get_terminfo ()
{
   int zero = 0;

   /* Apparantly, this cannot fail according to the man pages. */
   if (SLang_TT_Write_FD == -1)
     SLang_TT_Write_FD = fileno (stdout);
   
   Can_Background_Color_Erase = 0;

   Color_Fg_Str = "\033[3%dm";
   Color_Bg_Str = "\033[4%dm";
   Max_Terminfo_Colors = 8;

   get_color_info ();

   SLtt_set_term_vtxxx(&zero);
   Start_Alt_Chars_Str = "\016";
   End_Alt_Chars_Str = "\017";
   SLtt_Has_Alt_Charset = 1;
   SLtt_Graphics_Char_Pairs = "aaffgghhjjkkllmmnnooqqssttuuvvwwxx";
   Enable_Alt_Char_Set = "\033(B\033)0";
   SLtt_get_screen_size ();
}
#endif

/* This sets term for vt102 terminals it parameter vt100 is 0.  If vt100
 * is non-zero, set terminal appropriate for a only vt100
 * (no add line capability). */

void SLtt_set_term_vtxxx(int *vt100)
{
   Norm_Vid_Str = "\033[m";

   Scroll_R_Str = "\033[%i%d;%dr";
   Cls_Str = "\033[2J\033[H";
   Rev_Vid_Str = "\033[7m";
   Bold_Vid_Str = "\033[1m";
   Blink_Vid_Str = "\033[5m";
   UnderLine_Vid_Str = "\033[4m";
   Del_Eol_Str = "\033[K";
   Del_Bol_Str = "\033[1K";
   Rev_Scroll_Str = "\033M";
   Curs_F_Str = "\033[%dC";
   /* Len_Curs_F_Str = 5; */
   Curs_Pos_Str = "\033[%i%d;%dH";
   if ((vt100 == NULL) || (*vt100 == 0))
     {
	Ins_Mode_Str = "\033[4h";
	Eins_Mode_Str = "\033[4l";
	Del_Char_Str =  "\033[P";
	Del_N_Lines_Str = "\033[%dM";
	Add_N_Lines_Str = "\033[%dL";
	SLtt_Term_Cannot_Insert = 0;
     }
   else
     {
	Del_N_Lines_Str = NULL;
	Add_N_Lines_Str = NULL;
	SLtt_Term_Cannot_Insert = 1;
     }
   SLtt_Term_Cannot_Scroll = 0;
   /* No_Move_In_Standout = 0; */
}

int SLtt_init_video (void)
{
   /*   send_string_to_term("\033[?6h"); */
   /* relative origin mode */
   tt_write_string (Term_Init_Str);
   tt_write_string (Keypad_Init_Str);
   SLtt_reset_scroll_region();
   SLtt_end_insert();
   tt_write_string (Enable_Alt_Char_Set);
   Video_Initialized = 1;
   return 0;
}

int SLtt_reset_video (void)
{
   SLtt_goto_rc (SLtt_Screen_Rows - 1, 0);
   Cursor_Set = 0;
   SLtt_normal_video ();	       /* MSKermit requires this  */
   tt_write_string(Norm_Vid_Str);

   Current_Fgbg = 0xFFFFFFFFU;
   SLtt_set_alt_char_set (0);
   if (SLtt_Use_Ansi_Colors)
     {
	if (Reset_Color_String == NULL)
	  {
	     SLtt_Char_Type attr;
	     if (-1 != make_color_fgbg (NULL, NULL, &attr))
	       write_attributes (attr);
	     else tt_write_string ("\033[0m\033[m");
	  }
	else tt_write_string (Reset_Color_String);
	Current_Fgbg = 0xFFFFFFFFU;
     }
   SLtt_erase_line ();
   tt_write_string (Keypad_Reset_Str);
   tt_write_string (Term_Reset_Str);
   SLtt_flush_output ();
   Video_Initialized = 0;
   return 0;
}

void SLtt_bold_video (void)
{
   tt_write_string (Bold_Vid_Str);
}

int SLtt_set_mouse_mode (int mode, int force)
{
   char *term;

   if (force == 0)
     {
	if (NULL == (term = (char *) getenv("TERM"))) return -1;
	if (strncmp ("xterm", term, 5))
	  return -1;
     }

   if (mode)
     tt_write_string ("\033[?9h");
   else
     tt_write_string ("\033[?9l");

   return 0;
}

void SLtt_disable_status_line (void)
{
   if (SLtt_Has_Status_Line > 0)
     {
	tt_write_string (Disable_Status_line_Str);
	SLtt_flush_output ();
     }
}

int SLtt_write_to_status_line (char *s, int col)
{
   if ((SLtt_Has_Status_Line <= 0)
       || (Goto_Status_Line_Str == NULL)
       || (Return_From_Status_Line_Str == NULL))
     return -1;

   tt_printf (Goto_Status_Line_Str, col, 0);
   tt_write_string (s);
   tt_write_string (Return_From_Status_Line_Str);
   return 0;
}

void SLtt_get_screen_size (void)
{
#ifdef VMS
   int status, code;
   unsigned short chan;
   $DESCRIPTOR(dev_dsc, "SYS$INPUT:");
#endif
   int r = 0, c = 0;

#ifdef TIOCGWINSZ
   struct winsize wind_struct;

   do
     {
	if ((ioctl(1,TIOCGWINSZ,&wind_struct) == 0)
	    || (ioctl(0, TIOCGWINSZ, &wind_struct) == 0)
	    || (ioctl(2, TIOCGWINSZ, &wind_struct) == 0))
	  {
	     c = (int) wind_struct.ws_col;
	     r = (int) wind_struct.ws_row;
	     break;
	  }
     }
   while (errno == EINTR);

#endif

#ifdef VMS
   status = sys$assign(&dev_dsc,&chan,0,0,0);
   if (status & 1)
     {
	code = DVI$_DEVBUFSIZ;
	status = lib$getdvi(&code, &chan,0, &c, 0,0);
	if (!(status & 1))
	  c = 80;
	code = DVI$_TT_PAGE;
	status = lib$getdvi(&code, &chan,0, &r, 0,0);
	if (!(status & 1))
	  r = 24;
	sys$dassgn(chan);
     }
#endif

   if (r <= 0)
     {
	char *s = getenv ("LINES");
	if (s != NULL) r = atoi (s);
     }

   if (c <= 0)
     {
	char *s = getenv ("COLUMNS");
	if (s != NULL) c = atoi (s);
     }

   if ((r <= 0) || (r > SLTT_MAX_SCREEN_ROWS)) r = 24;
   if ((c <= 0) || (c > SLTT_MAX_SCREEN_COLS)) c = 80;
   SLtt_Screen_Rows = r;
   SLtt_Screen_Cols = c;
}

#if SLTT_HAS_NON_BCE_SUPPORT
int _SLtt_get_bce_color_offset (void)
{
   if ((SLtt_Use_Ansi_Colors == 0)
       || Can_Background_Color_Erase
       || SLtt_Use_Blink_For_ACS)      /* in this case, we cannot lose a color */
     Bce_Color_Offset = 0;
   else
     {
	if (GET_BG(Ansi_Color_Map[0].fgbg) == SLSMG_COLOR_DEFAULT)
	  Bce_Color_Offset = 0;
	else
	  Bce_Color_Offset = 1;
     }
   
   return Bce_Color_Offset;
}
#endif