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| Current File : //usr/src/contrib/ncurses/form/fty_enum.c |
/****************************************************************************
* Copyright (c) 1998-2006,2007 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. *
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****************************************************************************/
/***************************************************************************
* *
* Author : Juergen Pfeifer *
* *
***************************************************************************/
#include "form.priv.h"
MODULE_ID("$Id: fty_enum.c,v 1.22 2007/10/13 19:32:26 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 = typeMalloc(enumARG, 1);
if (argp)
{
int cnt = 0;
char **kp = (char **)0;
int ccase, cunique;
T((T_CREATE("enumARG %p"), argp));
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 = typeMalloc(enumARG, 1);
if (result)
{
T((T_CREATE("enumARG %p"), 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 whether 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 */