fty_alnum.c

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/*
 * THIS CODE IS SPECIFICALLY EXEMPTED FROM THE NCURSES PACKAGE COPYRIGHT.
 * You may freely copy it for use as a template for your own field types.
 * If you develop a field type that might be of general use, please send
 * it back to the ncurses maintainers for inclusion in the next version.
 */
/***************************************************************************
*                                                                          *
*  Author : Juergen Pfeifer                                                *
*                                                                          *
***************************************************************************/

#include "form.priv.h"

MODULE_ID("$Id: fty_alnum.c,v 1.18 2005/08/20 18:26:16 tom Exp $")

#define thisARG alnumARG

typedef struct
  {
    int width;
  }
thisARG;

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static void *Make_This_Type(va_list *ap)
|
|   Description   :  Allocate structure for alphanumeric type argument.
|
|   Return Values :  Pointer to argument structure or NULL on error
+--------------------------------------------------------------------------*/
static void *
Make_This_Type(va_list *ap)
{
  thisARG *argp = (thisARG *) malloc(sizeof(thisARG));

  if (argp)
    argp->width = va_arg(*ap, int);

  return ((void *)argp);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static void *Copy_ThisType(const void *argp)
|
|   Description   :  Copy structure for alphanumeric type argument.
|
|   Return Values :  Pointer to argument structure or NULL on error.
+--------------------------------------------------------------------------*/
static void *
Copy_This_Type(const void *argp)
{
  const thisARG *ap = (const thisARG *)argp;
  thisARG *result = (thisARG *) malloc(sizeof(thisARG));

  if (result)
    *result = *ap;

  return ((void *)result);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static void Free_This_Type(void *argp)
|
|   Description   :  Free structure for alphanumeric type argument.
|
|   Return Values :  -
+--------------------------------------------------------------------------*/
static void
Free_This_Type(void *argp)
{
  if (argp)
    free(argp);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static bool Check_This_Character(
|                                      int c,
|                                      const void *argp)
|
|   Description   :  Check a character for the alphanumeric type.
|
|   Return Values :  TRUE  - character is valid
|                    FALSE - character is invalid
+--------------------------------------------------------------------------*/
static bool
Check_This_Character(int c, const void *argp GCC_UNUSED)
{
#if USE_WIDEC_SUPPORT
  if (iswalnum((wint_t) c))
    return TRUE;
#endif
  return (isalnum(UChar(c)) ? TRUE : FALSE);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  static bool Check_This_Field(
|                                      FIELD *field,
|                                      const void *argp)
|
|   Description   :  Validate buffer content to be a valid alphanumeric value
|
|   Return Values :  TRUE  - field is valid
|                    FALSE - field is invalid
+--------------------------------------------------------------------------*/
static bool
Check_This_Field(FIELD *field, const void *argp)
{
  int width = ((const thisARG *)argp)->width;
  unsigned char *bp = (unsigned char *)field_buffer(field, 0);
  bool result = (width < 0);

  Check_CTYPE_Field(result, bp, width, Check_This_Character);
  return (result);
}

static FIELDTYPE typeTHIS =
{
  _HAS_ARGS | _RESIDENT,
  1,                            /* this is mutable, so we can't be const */
  (FIELDTYPE *)0,
  (FIELDTYPE *)0,
  Make_This_Type,
  Copy_This_Type,
  Free_This_Type,
  Check_This_Field,
  Check_This_Character,
  NULL,
  NULL
};

NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_ALNUM = &typeTHIS;

/* fty_alnum.c ends here */

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