release/src/router/libncurses/menu/m_item_new.c

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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 /***************************************************************************
  34 * Module m_item_new                                                        *
  35 * Create and destroy menu items                                            *
  36 * Set and get marker string for menu                                       *
  37 ***************************************************************************/
  38
  39 #include "menu.priv.h"
  40
  41 #if USE_WIDEC_SUPPORT
  42 #if HAVE_WCTYPE_H
  43 #include <wctype.h>
  44 #endif
  45 #endif
  46
  47 MODULE_ID("$Id: m_item_new.c,v 1.30 2010/01/23 21:20:11 tom Exp $")
  48
  49 /*---------------------------------------------------------------------------
  50 |   Facility      :  libnmenu
  51 |   Function      :  bool Is_Printable_String(const char *s)
  52 |
  53 |   Description   :  Checks whether or not the string contains only printable
  54 |                    characters.
  55 |
  56 |   Return Values :  TRUE     - if string is printable
  57 |                    FALSE    - if string contains non-printable characters
  58 +--------------------------------------------------------------------------*/
  59 static bool
  60 Is_Printable_String(const char *s)
  61 {
  62   int result = TRUE;
  63
  64 #if USE_WIDEC_SUPPORT
  65   int count = mbstowcs(0, s, 0);
  66   wchar_t *temp = 0;
  67
  68   assert(s);
  69
  70   if (count > 0
  71       && (temp = typeCalloc(wchar_t, (2 + (unsigned)count))) != 0)
  72     {
  73       int n;
  74
  75       mbstowcs(temp, s, (unsigned)count);
  76       for (n = 0; n < count; ++n)
  77         if (!iswprint((wint_t) temp[n]))
  78           {
  79             result = FALSE;
  80             break;
  81           }
  82       free(temp);
  83     }
  84 #else
  85   assert(s);
  86   while (*s)
  87     {
  88       if (!isprint(UChar(*s)))
  89         {
  90           result = FALSE;
  91           break;
  92         }
  93       s++;
  94     }
  95 #endif
  96   return result;
  97 }
  98
  99 /*---------------------------------------------------------------------------
 100 |   Facility      :  libnmenu
 101 |   Function      :  ITEM *new_item(char *name, char *description)
 102 |
 103 |   Description   :  Create a new item with name and description. Return
 104 |                    a pointer to this new item.
 105 |                    N.B.: an item must(!) have a name.
 106 |
 107 |   Return Values :  The item pointer or NULL if creation failed.
 108 +--------------------------------------------------------------------------*/
 109 NCURSES_EXPORT(ITEM *)
 110 new_item(const char *name, const char *description)
 111 {
 112   ITEM *item;
 113
 114   T((T_CALLED("new_item(\"%s\", \"%s\")"),
 115      name ? name : "",
 116      description ? description : ""));
 117
 118   if (!name || (*name == '\0') || !Is_Printable_String(name))
 119     {
 120       item = (ITEM *) 0;
 121       SET_ERROR(E_BAD_ARGUMENT);
 122     }
 123   else
 124     {
 125       item = typeCalloc(ITEM, 1);
 126       if (item)
 127         {
 128           *item = _nc_Default_Item;     /* hope we have struct assignment */
 129
 130           item->name.length = strlen(name);
 131           item->name.str = name;
 132
 133           if (description && (*description != '\0') &&
 134               Is_Printable_String(description))
 135             {
 136               item->description.length = strlen(description);
 137               item->description.str = description;
 138             }
 139           else
 140             {
 141               item->description.length = 0;
 142               item->description.str = (char *)0;
 143             }
 144         }
 145       else
 146         SET_ERROR(E_SYSTEM_ERROR);
 147     }
 148   returnItem(item);
 149 }
 150
 151 /*---------------------------------------------------------------------------
 152 |   Facility      :  libnmenu
 153 |   Function      :  int free_item(ITEM *item)
 154 |
 155 |   Description   :  Free the allocated storage for this item.
 156 |                    N.B.: a connected item can't be freed.
 157 |
 158 |   Return Values :  E_OK              - success
 159 |                    E_BAD_ARGUMENT    - invalid value has been passed
 160 |                    E_CONNECTED       - item is still connected to a menu
 161 +--------------------------------------------------------------------------*/
 162 NCURSES_EXPORT(int)
 163 free_item(ITEM * item)
 164 {
 165   T((T_CALLED("free_item(%p)"), (void *)item));
 166
 167   if (!item)
 168     RETURN(E_BAD_ARGUMENT);
 169
 170   if (item->imenu)
 171     RETURN(E_CONNECTED);
 172
 173   free(item);
 174
 175   RETURN(E_OK);
 176 }
 177
 178 /*---------------------------------------------------------------------------
 179 |   Facility      :  libnmenu
 180 |   Function      :  int set_menu_mark( MENU *menu, const char *mark )
 181 |
 182 |   Description   :  Set the mark string used to indicate the current
 183 |                    item (single-valued menu) or the selected items
 184 |                    (multi-valued menu).
 185 |                    The mark argument may be NULL, in which case no
 186 |                    marker is used.
 187 |                    This might be a little bit tricky, because this may
 188 |                    affect the geometry of the menu, which we don't allow
 189 |                    if it is already posted.
 190 |
 191 |   Return Values :  E_OK               - success
 192 |                    E_BAD_ARGUMENT     - an invalid value has been passed
 193 |                    E_SYSTEM_ERROR     - no memory to store mark
 194 +--------------------------------------------------------------------------*/
 195 NCURSES_EXPORT(int)
 196 set_menu_mark(MENU * menu, const char *mark)
 197 {
 198   unsigned l;
 199
 200   T((T_CALLED("set_menu_mark(%p,%s)"), (void *)menu, _nc_visbuf(mark)));
 201
 202   if (mark && (*mark != '\0') && Is_Printable_String(mark))
 203     l = strlen(mark);
 204   else
 205     l = 0;
 206
 207   if (menu)
 208     {
 209       char *old_mark = menu->mark;
 210       unsigned short old_status = menu->status;
 211
 212       if (menu->status & _POSTED)
 213         {
 214           /* If the menu is already posted, the geometry is fixed. Then
 215              we can only accept a mark with exactly the same length */
 216           if (menu->marklen != (int)l)
 217             RETURN(E_BAD_ARGUMENT);
 218         }
 219       menu->marklen = l;
 220       if (l)
 221         {
 222           menu->mark = strdup(mark);
 223           if (menu->mark)
 224             {
 225               strcpy(menu->mark, mark);
 226               if (menu != &_nc_Default_Menu)
 227                 menu->status |= _MARK_ALLOCATED;
 228             }
 229           else
 230             {
 231               menu->mark = old_mark;
 232               menu->marklen = (old_mark != 0) ? strlen(old_mark) : 0;
 233               RETURN(E_SYSTEM_ERROR);
 234             }
 235         }
 236       else
 237         menu->mark = (char *)0;
 238
 239       if ((old_status & _MARK_ALLOCATED) && old_mark)
 240         free(old_mark);
 241
 242       if (menu->status & _POSTED)
 243         {
 244           _nc_Draw_Menu(menu);
 245           _nc_Show_Menu(menu);
 246         }
 247       else
 248         {
 249           /* Recalculate the geometry */
 250           _nc_Calculate_Item_Length_and_Width(menu);
 251         }
 252     }
 253   else
 254     {
 255       returnCode(set_menu_mark(&_nc_Default_Menu, mark));
 256     }
 257   RETURN(E_OK);
 258 }
 259
 260 /*---------------------------------------------------------------------------
 261 |   Facility      :  libnmenu
 262 |   Function      :  char *menu_mark(const MENU *menu)
 263 |
 264 |   Description   :  Return a pointer to the marker string
 265 |
 266 |   Return Values :  The marker string pointer or NULL if no marker defined
 267 +--------------------------------------------------------------------------*/
 268 NCURSES_EXPORT(const char *)
 269 menu_mark(const MENU * menu)
 270 {
 271   T((T_CALLED("menu_mark(%p)"), (const void *)menu));
 272   returnPtr(Normalize_Menu(menu)->mark);
 273 }
 274
 275 /* m_item_new.c */