freebsd-dev/contrib/ncurses/menu/m_pattern.c

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/****************************************************************************
 *   Author: Juergen Pfeifer <juergen.pfeifer@gmx.net> 1995,1997            *
 ****************************************************************************/

/***************************************************************************
* Module m_pattern                                                         *
* Pattern matching handling                                                *
***************************************************************************/

#include "menu.priv.h"

MODULE_ID("$Id: m_pattern.c,v 1.6 2000/12/10 02:16:48 tom Exp $")

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  char *menu_pattern(const MENU *menu)
|   
|   Description   :  Return the value of the pattern buffer.
|
|   Return Values :  NULL          - if there is no pattern buffer allocated
|                    EmptyString   - if there is a pattern buffer but no
|                                    pattern is stored
|                    PatternString - as expected
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(char *)
menu_pattern (const MENU * menu)
{
  return (menu ? (menu->pattern ? menu->pattern : "") : (char *)0);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  int set_menu_pattern(MENU *menu, const char *p)
|   
|   Description   :  Set the match pattern for a menu and position to the
|                    first item that matches.
|
|   Return Values :  E_OK              - success
|                    E_BAD_ARGUMENT    - invalid menu or pattern pointer
|                    E_NOT_CONNECTED   - no items connected to menu
|                    E_BAD_STATE       - menu in user hook routine
|                    E_NO_MATCH        - no item matches pattern
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
set_menu_pattern (MENU *menu, const char *p)
{
  ITEM *matchitem;
  int   matchpos;
  
  if (!menu || !p)	
    RETURN(E_BAD_ARGUMENT);
  
  if (!(menu->items))
    RETURN(E_NOT_CONNECTED);
  
  if ( menu->status & _IN_DRIVER )
    RETURN(E_BAD_STATE);
  
  Reset_Pattern(menu);
  
  if (!(*p))
    {
      pos_menu_cursor(menu);
      RETURN(E_OK);
    }
  
  if (menu->status & _LINK_NEEDED) 
    _nc_Link_Items(menu);
  
  matchpos  = menu->toprow;
  matchitem = menu->curitem;
  assert(matchitem);
  
  while(*p)
    {
      if ( !isprint((unsigned char)(*p)) || 
	  (_nc_Match_Next_Character_In_Item_Name(menu,*p,&matchitem) != E_OK) )
	{
	  Reset_Pattern(menu);
	  pos_menu_cursor(menu);
	  RETURN(E_NO_MATCH);
	}
      p++;
    }			
  
  /* This is reached if there was a match. So we position to the new item */
  Adjust_Current_Item(menu,matchpos,matchitem);
  RETURN(E_OK);
}

/* m_pattern.c ends here */