ncurses 4.2

[ncurses.git] / form / fld_newftyp.c

diff --git a/form/fld_newftyp.c b/form/fld_newftyp.c
new file mode 100644 (file)
index 0000000..12487c9
--- /dev/null
+++ b/form/fld_newftyp.c
@@ -0,0 +1,125 @@
+/****************************************************************************
+ * Copyright (c) 1998 Free Software Foundation, Inc.                        *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *   Author: Juergen Pfeifer <Juergen.Pfeifer@T-Online.de> 1995,1997        *
+ ****************************************************************************/
+
+#include "form.priv.h"
+
+MODULE_ID("$Id: fld_newftyp.c,v 1.2 1998/02/11 12:13:44 tom Exp $")
+
+static FIELDTYPE const default_fieldtype = {
+  0,                   /* status                                      */
+  0L,                  /* reference count                             */
+  (FIELDTYPE *)0,      /* pointer to left  operand                    */
+  (FIELDTYPE *)0,      /* pointer to right operand                    */
+  NULL,                /* makearg function                            */
+  NULL,                /* copyarg function                            */
+  NULL,                /* freearg function                            */
+  NULL,                /* field validation function                   */
+  NULL,                /* Character check function                    */
+  NULL,                /* enumerate next function                     */
+  NULL                 /* enumerate previous function                 */
+};
+
+const FIELDTYPE* _nc_Default_FieldType = &default_fieldtype;
+\f
+/*---------------------------------------------------------------------------
+|   Facility      :  libnform  
+|   Function      :  FIELDTYPE *new_fieldtype(
+|                       bool (* const field_check)(FIELD *,const void *),
+|                       bool (* const char_check) (int, const void *) ) 
+|   
+|   Description   :  Create a new fieldtype. The application programmer must
+|                    write a field_check and a char_check function and give
+|                    them as input to this call.
+|                    If an error occurs, errno is set to                    
+|                       E_BAD_ARGUMENT  - invalid arguments
+|                       E_SYSTEM_ERROR  - system error (no memory)
+|
+|   Return Values :  Fieldtype pointer or NULL if error occured
++--------------------------------------------------------------------------*/
+FIELDTYPE *new_fieldtype(
+ bool (* const field_check)(FIELD *,const void *),
+ bool (* const char_check) (int,const void *) )
+{
+  FIELDTYPE *nftyp = (FIELDTYPE *)0;
+  
+  if ( (field_check) && (char_check) )
+    {
+      nftyp = (FIELDTYPE *)malloc(sizeof(FIELDTYPE));
+      if (nftyp)
+       {
+         *nftyp = default_fieldtype;
+         nftyp->fcheck = field_check;
+         nftyp->ccheck = char_check;
+       }
+      else
+       {
+         SET_ERROR( E_SYSTEM_ERROR );
+       }
+    }
+  else
+    {
+      SET_ERROR( E_BAD_ARGUMENT );
+    }
+  return nftyp;
+}
+
+/*---------------------------------------------------------------------------
+|   Facility      :  libnform  
+|   Function      :  int free_fieldtype(FIELDTYPE *typ)
+|   
+|   Description   :  Release the memory associated with this fieldtype.
+|
+|   Return Values :  E_OK            - success
+|                    E_CONNECTED     - there are fields referencing the type
+|                    E_BAD_ARGUMENT  - invalid fieldtype pointer
++--------------------------------------------------------------------------*/
+int free_fieldtype(FIELDTYPE *typ)
+{
+  if (!typ)
+    RETURN(E_BAD_ARGUMENT);
+
+  if (typ->ref!=0)
+    RETURN(E_CONNECTED);
+
+  if (typ->status & _RESIDENT)
+    RETURN(E_CONNECTED);
+
+  if (typ->status & _LINKED_TYPE)
+    {
+      if (typ->left ) typ->left->ref--;
+      if (typ->right) typ->right->ref--;
+    }
+  free(typ);
+  RETURN(E_OK);
+}
+
+/* fld_newftyp.c ends here */