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- /****************************************************************************
- * Copyright (c) 1998,2000 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, 1995,1997 *
- * Contact: http://www.familiepfeifer.de/Contact.aspx?Lang=en *
- ****************************************************************************/
-
- #include "form.priv.h"
-
- MODULE_ID("$Id: frm_data.c,v 1.8 2002/07/06 15:33:27 juergen Exp $")
-
- /*---------------------------------------------------------------------------
- | 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
- +--------------------------------------------------------------------------*/
- NCURSES_EXPORT(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
- +--------------------------------------------------------------------------*/
- NCURSES_EXPORT(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);
-
- large_buffer = (field->cols > SMALL_BUFFER_SIZE);
- if (large_buffer)
- bp = (char *)malloc((size_t)(field->cols) + 1);
- else
- bp = buffer;
-
- assert(bp);
-
- 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 */
-