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/****************************************************************************
* 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@gmx.net> 1995,1997 *
****************************************************************************/
#include "form.priv.h"
MODULE_ID("$Id$")
extern int winnstr(WINDOW *, char *, int);
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : bool data_behind(const FORM *form)
|
| Description : Check for off-screen data behind. This is nearly trivial
| becose the begin of a field is fixed.
|
| Return Values : TRUE - there are off-screen data behind
| FALSE - there are no off-screen data behind
+--------------------------------------------------------------------------*/
bool data_behind(const FORM *form)
{
bool result = FALSE;
if (form && (form->status & _POSTED) && form->current)
{
FIELD *field;
field = form->current;
if (!Single_Line_Field(field))
{
result = (form->toprow==0) ? FALSE : TRUE;
}
else
{
result = (form->begincol==0) ? FALSE : TRUE;
}
}
return(result);
}
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : static char * After_Last_Non_Pad_Position(
| char *buffer,
| int len,
| int pad)
|
| Description : Find the last position in the buffer that doesn't
| contain a padding character.
|
| Return Values : The pointer to this position
+--------------------------------------------------------------------------*/
INLINE
static char * After_Last_Non_Pad_Position(char *buffer, int len, int pad)
{
char *end = buffer + len;
assert(buffer && len>=0);
while ( (buffer < end) && (*(end-1)==pad) )
end--;
return end;
}
#define SMALL_BUFFER_SIZE (80)
/*---------------------------------------------------------------------------
| Facility : libnform
| Function : bool data_ahead(const FORM *form)
|
| Description : Check for off-screen data ahead. This is more difficult
| because a dynamic field has a variable end.
|
| Return Values : TRUE - there are off-screen data ahead
| FALSE - there are no off-screen data ahead
+--------------------------------------------------------------------------*/
bool data_ahead(const FORM *form)
{
bool result = FALSE;
if (form && (form->status & _POSTED) && form->current)
{
static char buffer[SMALL_BUFFER_SIZE + 1];
FIELD *field;
bool large_buffer;
bool cursor_moved = FALSE;
char *bp;
char *found_content;
int pos;
field = form->current;
assert(form->w != 0);
large_buffer = (field->cols > SMALL_BUFFER_SIZE);
if (large_buffer)
bp = (char *)malloc((size_t)(field->cols) + 1);
else
bp = buffer;
assert(bp != 0);
if (Single_Line_Field(field))
{
int check_len;
pos = form->begincol + field->cols;
while (pos < field->dcols)
{
check_len = field->dcols - pos;
if ( check_len >= field->cols )
check_len = field->cols;
cursor_moved = TRUE;
wmove(form->w,0,pos);
winnstr(form->w,bp,check_len);
found_content =
After_Last_Non_Pad_Position(bp,check_len,field->pad);
if (found_content==bp)
pos += field->cols;
else
{
result = TRUE;
break;
}
}
}
else
{
pos = form->toprow + field->rows;
while (pos < field->drows)
{
cursor_moved = TRUE;
wmove(form->w,pos,0);
pos++;
winnstr(form->w,bp,field->cols);
found_content =
After_Last_Non_Pad_Position(bp,field->cols,field->pad);
if (found_content!=bp)
{
result = TRUE;
break;
}
}
}
if (large_buffer)
free(bp);
if (cursor_moved)
wmove(form->w,form->currow,form->curcol);
}
return(result);
}
/* frm_data.c ends here */
|
