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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, juergen.pfeifer@gmx.net *
* *
***************************************************************************/
#include "form.priv.h"
MODULE_ID("$Id: fty_num.c,v 1.14 2000/12/09 23:46:12 tom Exp $")
#if HAVE_LOCALE_H
#include <locale.h>
#endif
typedef struct {
int precision;
double low;
double high;
struct lconv* L;
} numericARG;
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void *Make_Numeric_Type(va_list * ap)
|
| Description : Allocate structure for numeric type argument.
|
| Return Values : Pointer to argument structure or NULL on error
+--------------------------------------------------------------------------*/
static void *Make_Numeric_Type(va_list * ap)
{
numericARG *argn = (numericARG *)malloc(sizeof(numericARG));
if (argn)
{
argn->precision = va_arg(*ap,int);
argn->low = va_arg(*ap,double);
argn->high = va_arg(*ap,double);
#if HAVE_LOCALE_H
argn->L = localeconv();
#else
argn->L = NULL;
#endif
}
return (void *)argn;
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void *Copy_Numeric_Type(const void * argp)
|
| Description : Copy structure for numeric type argument.
|
| Return Values : Pointer to argument structure or NULL on error.
+--------------------------------------------------------------------------*/
static void *Copy_Numeric_Type(const void * argp)
{
const numericARG *ap = (const numericARG *)argp;
numericARG *result = (numericARG *)0;
if (argp)
{
result = (numericARG *)malloc(sizeof(numericARG));
if (result)
*result = *ap;
}
return (void *)result;
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void Free_Numeric_Type(void * argp)
|
| Description : Free structure for numeric type argument.
|
| Return Values : -
+--------------------------------------------------------------------------*/
static void Free_Numeric_Type(void * argp)
{
if (argp)
free(argp);
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static bool Check_Numeric_Field(FIELD * field,
| const void * argp)
|
| Description : Validate buffer content to be a valid numeric value
|
| Return Values : TRUE - field is valid
| FALSE - field is invalid
+--------------------------------------------------------------------------*/
static bool Check_Numeric_Field(FIELD * field, const void * argp)
{
const numericARG *argn = (const numericARG *)argp;
double low = argn->low;
double high = argn->high;
int prec = argn->precision;
unsigned char *bp = (unsigned char *)field_buffer(field,0);
char *s = (char *)bp;
double val = 0.0;
struct lconv* L = argn->L;
char buf[64];
while(*bp && *bp==' ') bp++;
if (*bp)
{
if (*bp=='-' || *bp=='+')
bp++;
while(*bp)
{
if (!isdigit(*bp)) break;
bp++;
}
if (*bp==(
#if HAVE_LOCALE_H
(L && L->decimal_point) ? *(L->decimal_point) :
#endif
'.'))
{
bp++;
while(*bp)
{
if (!isdigit(*bp)) break;
bp++;
}
}
while(*bp && *bp==' ') bp++;
if (*bp=='\0')
{
val = atof(s);
if (low<high)
{
if (val<low || val>high) return FALSE;
}
sprintf(buf,"%.*f",(prec>0?prec:0),val);
set_field_buffer(field,0,buf);
return TRUE;
}
}
return FALSE;
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static bool Check_Numeric_Character(
| int c,
| const void * argp)
|
| Description : Check a character for the numeric type.
|
| Return Values : TRUE - character is valid
| FALSE - character is invalid
+--------------------------------------------------------------------------*/
static bool Check_Numeric_Character(int c, const void * argp)
{
const numericARG *argn = (const numericARG *)argp;
struct lconv* L = argn->L;
return (isdigit(c) ||
c == '+' ||
c == '-' ||
c == (
#if HAVE_LOCALE_H
(L && L->decimal_point) ? *(L->decimal_point) :
#endif
'.')
) ? TRUE : FALSE;
}
static FIELDTYPE typeNUMERIC = {
_HAS_ARGS | _RESIDENT,
1, /* this is mutable, so we can't be const */
(FIELDTYPE *)0,
(FIELDTYPE *)0,
Make_Numeric_Type,
Copy_Numeric_Type,
Free_Numeric_Type,
Check_Numeric_Field,
Check_Numeric_Character,
NULL,
NULL
};
NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_NUMERIC = &typeNUMERIC;
/* fty_num.c ends here */
|
