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|
/* $OpenBSD: fty_enum.c,v 1.9 2001/01/22 18:02:17 millert Exp $ */
/*
* 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("$From: fty_enum.c,v 1.15 2000/12/09 23:46:12 tom Exp $")
typedef struct {
char **kwds;
int count;
bool checkcase;
bool checkunique;
} enumARG;
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void *Make_Enum_Type( va_list * ap )
|
| Description : Allocate structure for enumeration type argument.
|
| Return Values : Pointer to argument structure or NULL on error
+--------------------------------------------------------------------------*/
static void *Make_Enum_Type(va_list * ap)
{
enumARG *argp = (enumARG *)malloc(sizeof(enumARG));
if (argp)
{
int cnt = 0;
char **kp = (char **)0;
int ccase, cunique;
argp->kwds = va_arg(*ap,char **);
ccase = va_arg(*ap,int);
cunique = va_arg(*ap,int);
argp->checkcase = ccase ? TRUE : FALSE;
argp->checkunique = cunique ? TRUE : FALSE;
kp = argp->kwds;
while( kp && (*kp++) ) cnt++;
argp->count = cnt;
}
return (void *)argp;
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void *Copy_Enum_Type( const void * argp )
|
| Description : Copy structure for enumeration type argument.
|
| Return Values : Pointer to argument structure or NULL on error.
+--------------------------------------------------------------------------*/
static void *Copy_Enum_Type(const void * argp)
{
enumARG *result = (enumARG *)0;
if (argp)
{
const enumARG *ap = (const enumARG *)argp;
result = (enumARG *)malloc(sizeof(enumARG));
if (result)
*result = *ap;
}
return (void *)result;
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static void Free_Enum_Type( void * argp )
|
| Description : Free structure for enumeration type argument.
|
| Return Values : -
+--------------------------------------------------------------------------*/
static void Free_Enum_Type(void * argp)
{
if (argp)
free(argp);
}
#define SKIP_SPACE(x) while(((*(x))!='\0') && (is_blank(*(x)))) (x)++
#define NOMATCH 0
#define PARTIAL 1
#define EXACT 2
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static int Compare(const unsigned char * s,
| const unsigned char * buf,
| bool ccase )
|
| Description : Check wether or not the text in 'buf' matches the
| text in 's', at least partial.
|
| Return Values : NOMATCH - buffer doesn't match
| PARTIAL - buffer matches partially
| EXACT - buffer matches exactly
+--------------------------------------------------------------------------*/
static int Compare(const unsigned char *s, const unsigned char *buf,
bool ccase)
{
SKIP_SPACE(buf); /* Skip leading spaces in both texts */
SKIP_SPACE(s);
if (*buf=='\0')
{
return (((*s)!='\0') ? NOMATCH : EXACT);
}
else
{
if (ccase)
{
while(*s++ == *buf)
{
if (*buf++=='\0') return EXACT;
}
}
else
{
while(toupper(*s++)==toupper(*buf))
{
if (*buf++=='\0') return EXACT;
}
}
}
/* At this location buf points to the first character where it no longer
matches with s. So if only blanks are following, we have a partial
match otherwise there is no match */
SKIP_SPACE(buf);
if (*buf)
return NOMATCH;
/* If it happens that the reference buffer is at its end, the partial
match is actually an exact match. */
return ((s[-1]!='\0') ? PARTIAL : EXACT);
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static bool Check_Enum_Field(
| FIELD * field,
| const void * argp)
|
| Description : Validate buffer content to be a valid enumeration value
|
| Return Values : TRUE - field is valid
| FALSE - field is invalid
+--------------------------------------------------------------------------*/
static bool Check_Enum_Field(FIELD * field, const void * argp)
{
char **kwds = ((const enumARG *)argp)->kwds;
bool ccase = ((const enumARG *)argp)->checkcase;
bool unique = ((const enumARG *)argp)->checkunique;
unsigned char *bp = (unsigned char *)field_buffer(field,0);
char *s, *t, *p;
int res;
while( kwds && (s=(*kwds++)) )
{
if ((res=Compare((unsigned char *)s,bp,ccase))!=NOMATCH)
{
p=t=s; /* t is at least a partial match */
if ((unique && res!=EXACT))
{
while( kwds && (p = *kwds++) )
{
if ((res=Compare((unsigned char *)p,bp,ccase))!=NOMATCH)
{
if (res==EXACT)
{
t = p;
break;
}
else
t = (char *)0;
}
}
}
if (t)
{
set_field_buffer(field,0,t);
return TRUE;
}
if (!p)
break;
}
}
return FALSE;
}
static const char *dummy[] = { (char *)0 };
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static bool Next_Enum(FIELD * field,
| const void * argp)
|
| Description : Check for the next enumeration value
|
| Return Values : TRUE - next value found and loaded
| FALSE - no next value loaded
+--------------------------------------------------------------------------*/
static bool Next_Enum(FIELD * field, const void * argp)
{
const enumARG *args = (const enumARG *)argp;
char **kwds = args->kwds;
bool ccase = args->checkcase;
int cnt = args->count;
unsigned char *bp = (unsigned char *)field_buffer(field,0);
if (kwds) {
while(cnt--)
{
if (Compare((unsigned char *)(*kwds++),bp,ccase)==EXACT)
break;
}
if (cnt<=0)
kwds = args->kwds;
if ((cnt>=0) || (Compare((const unsigned char *)dummy,bp,ccase)==EXACT))
{
set_field_buffer(field,0,*kwds);
return TRUE;
}
}
return FALSE;
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static bool Previous_Enum(
| FIELD * field,
| const void * argp)
|
| Description : Check for the previous enumeration value
|
| Return Values : TRUE - previous value found and loaded
| FALSE - no previous value loaded
+--------------------------------------------------------------------------*/
static bool Previous_Enum(FIELD * field, const void * argp)
{
const enumARG *args = (const enumARG *)argp;
int cnt = args->count;
char **kwds = &args->kwds[cnt-1];
bool ccase = args->checkcase;
unsigned char *bp = (unsigned char *)field_buffer(field,0);
if (kwds) {
while(cnt--)
{
if (Compare((unsigned char *)(*kwds--),bp,ccase)==EXACT)
break;
}
if (cnt<=0)
kwds = &args->kwds[args->count-1];
if ((cnt>=0) || (Compare((const unsigned char *)dummy,bp,ccase)==EXACT))
{
set_field_buffer(field,0,*kwds);
return TRUE;
}
}
return FALSE;
}
static FIELDTYPE typeENUM = {
_HAS_ARGS | _HAS_CHOICE | _RESIDENT,
1, /* this is mutable, so we can't be const */
(FIELDTYPE *)0,
(FIELDTYPE *)0,
Make_Enum_Type,
Copy_Enum_Type,
Free_Enum_Type,
Check_Enum_Field,
NULL,
Next_Enum,
Previous_Enum
};
NCURSES_EXPORT_VAR(FIELDTYPE*) TYPE_ENUM = &typeENUM;
/* fty_enum.c ends here */
|
