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m_item_new.c
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C/C++ Source or Header
|
1996-09-28
|
7KB
|
189 lines
/***************************************************************************
* COPYRIGHT NOTICE *
****************************************************************************
* ncurses is copyright (C) 1992-1995 *
* Zeyd M. Ben-Halim *
* zmbenhal@netcom.com *
* Eric S. Raymond *
* esr@snark.thyrsus.com *
* *
* Permission is hereby granted to reproduce and distribute ncurses *
* by any means and for any fee, whether alone or as part of a *
* larger distribution, in source or in binary form, PROVIDED *
* this notice is included with any such distribution, and is not *
* removed from any of its header files. Mention of ncurses in any *
* applications linked with it is highly appreciated. *
* *
* ncurses comes AS IS with no warranty, implied or expressed. *
* *
***************************************************************************/
/***************************************************************************
* Module menu_item_new *
* Create and destroy menu items *
* Set and get marker string for menu
***************************************************************************/
#include "menu.priv.h"
/*---------------------------------------------------------------------------
| Facility : libnmenu
| Function : bool Is_Printable_String(const char *s)
|
| Description : Checks whether or not the string contains only printable
| characters.
|
| Return Values : TRUE - if string is printable
| FALSE - if string contains non-printable characters
+--------------------------------------------------------------------------*/
static bool Is_Printable_String(const char *s)
{
assert(s);
while(*s)
{
if (!isprint((unsigned char)*s))
return FALSE;
s++;
}
return TRUE;
}
/*---------------------------------------------------------------------------
| Facility : libnmenu
| Function : ITEM *new_item(char *name, char *description)
|
| Description : Create a new item with name and description. Return
| a pointer to this new item.
| N.B.: an item must(!) have a name.
|
| Return Values : The item pointer or NULL if creation failed.
+--------------------------------------------------------------------------*/
ITEM *new_item(char *name, char *description)
{
ITEM *item;
if ( !name || (*name == '\0') || !Is_Printable_String(name) )
{
item = (ITEM *)0;
SET_ERROR( E_BAD_ARGUMENT );
}
else
{
item = (ITEM *)calloc(1,sizeof(ITEM));
if (item)
{
*item = _nc_Default_Item; /* hope we have struct assignment */
item->name.str = name;
item->name.length = strlen(name);
item->description.str = description;
if (description && Is_Printable_String(description))
item->description.length = strlen(description);
else
{
item->description.length = 0;
item->description.str = (char *)0;
}
}
else
SET_ERROR( E_SYSTEM_ERROR );
}
return(item);
}
/*---------------------------------------------------------------------------
| Facility : libnmenu
| Function : int free_item(ITEM *item)
|
| Description : Free the allocated storage for this item.
| N.B.: a connected item can't be freed.
|
| Return Values : E_OK - success
| E_BAD_ARGUMENT - invalid value has been passed
| E_CONNECTED - item is still connected to a menu
+--------------------------------------------------------------------------*/
int free_item(ITEM * item)
{
if (!item)
RETURN( E_BAD_ARGUMENT );
if (item->imenu)
RETURN( E_CONNECTED );
free(item);
RETURN( E_OK );
}
/*---------------------------------------------------------------------------
| Facility : libnmenu
| Function : int set_menu_mark( MENU *menu, char *mark )
|
| Description : Set the mark string used to indicate the current
| item (single-valued menu) or the selected items
| (multi-valued menu).
| The mark argument may be NULL, in which case no
| marker is used.
| This might be a little bit tricky, because this may
| affect the geometry of the menu, which we don't allow
| if it is already posted.
|
| Return Values : E_OK - success
| E_BAD_ARGUMENT - an invalid value has been passed
+--------------------------------------------------------------------------*/
int set_menu_mark(MENU * menu, char * mark)
{
int l;
if ( mark && *mark && Is_Printable_String(mark) )
l = strlen(mark);
else
l = 0;
if ( menu )
{
if (menu->status & _POSTED)
{
/* If the menu is already posted, the geometry is fixed. Then
we can only accept a mark with exactly the same length */
if (menu->marklen != l)
RETURN(E_BAD_ARGUMENT);
}
menu->mark = l ? mark : (char *)0;
menu->marklen = l;
if (menu->status & _POSTED)
{
_nc_Draw_Menu( menu );
_nc_Show_Menu( menu );
}
else
{
/* Recalculate the geometry */
_nc_Calculate_Item_Length_and_Width( menu );
}
}
else
{
_nc_Default_Menu.mark = l ? mark : (char *)0;
_nc_Default_Menu.marklen = l;
}
RETURN(E_OK);
}
/*---------------------------------------------------------------------------
| Facility : libnmenu
| Function : char *menu_mark(const MENU *menu)
|
| Description : Return a pointer to the marker string
|
| Return Values : The marker string pointer or NULL if no marker defined
+--------------------------------------------------------------------------*/
char *menu_mark(const MENU * menu)
{
return Normalize_Menu( menu )->mark;
}
/* m_item_new.c */