184 lines
6.1 KiB
C
184 lines
6.1 KiB
C
/****************************************************************************
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* Copyright (c) 1998,2000 Free Software Foundation, Inc. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the *
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* "Software"), to deal in the Software without restriction, including *
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* without limitation the rights to use, copy, modify, merge, publish, *
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* distribute, distribute with modifications, sublicense, and/or sell *
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* copies of the Software, and to permit persons to whom the Software is *
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* furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included *
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* in all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Except as contained in this notice, the name(s) of the above copyright *
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* holders shall not be used in advertising or otherwise to promote the *
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* sale, use or other dealings in this Software without prior written *
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* authorization. *
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****************************************************************************/
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/****************************************************************************
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* Author: Juergen Pfeifer <juergen.pfeifer@gmx.net> 1995,1997 *
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****************************************************************************/
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#include "form.priv.h"
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MODULE_ID("$Id: frm_data.c,v 1.7 2000/12/10 02:09:38 tom Exp $")
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : bool data_behind(const FORM *form)
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| Description : Check for off-screen data behind. This is nearly trivial
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| becose the begin of a field is fixed.
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| Return Values : TRUE - there are off-screen data behind
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| FALSE - there are no off-screen data behind
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+--------------------------------------------------------------------------*/
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NCURSES_EXPORT(bool)
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data_behind (const FORM *form)
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{
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bool result = FALSE;
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if (form && (form->status & _POSTED) && form->current)
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{
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FIELD *field;
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field = form->current;
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if (!Single_Line_Field(field))
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{
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result = (form->toprow==0) ? FALSE : TRUE;
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}
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else
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{
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result = (form->begincol==0) ? FALSE : TRUE;
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}
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}
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return(result);
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}
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : static char * After_Last_Non_Pad_Position(
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| char *buffer,
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| int len,
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| int pad)
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| Description : Find the last position in the buffer that doesn't
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| contain a padding character.
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| Return Values : The pointer to this position
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+--------------------------------------------------------------------------*/
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INLINE
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static char * After_Last_Non_Pad_Position(char *buffer, int len, int pad)
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{
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char *end = buffer + len;
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assert(buffer && len>=0);
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while ( (buffer < end) && (*(end-1)==pad) )
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end--;
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return end;
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}
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#define SMALL_BUFFER_SIZE (80)
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/*---------------------------------------------------------------------------
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| Facility : libnform
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| Function : bool data_ahead(const FORM *form)
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| Description : Check for off-screen data ahead. This is more difficult
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| because a dynamic field has a variable end.
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| Return Values : TRUE - there are off-screen data ahead
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| FALSE - there are no off-screen data ahead
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+--------------------------------------------------------------------------*/
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NCURSES_EXPORT(bool)
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data_ahead (const FORM *form)
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{
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bool result = FALSE;
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if (form && (form->status & _POSTED) && form->current)
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{
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static char buffer[SMALL_BUFFER_SIZE + 1];
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FIELD *field;
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bool large_buffer;
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bool cursor_moved = FALSE;
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char *bp;
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char *found_content;
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int pos;
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field = form->current;
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assert(form->w);
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large_buffer = (field->cols > SMALL_BUFFER_SIZE);
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if (large_buffer)
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bp = (char *)malloc((size_t)(field->cols) + 1);
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else
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bp = buffer;
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assert(bp);
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if (Single_Line_Field(field))
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{
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int check_len;
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pos = form->begincol + field->cols;
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while (pos < field->dcols)
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{
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check_len = field->dcols - pos;
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if ( check_len >= field->cols )
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check_len = field->cols;
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cursor_moved = TRUE;
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wmove(form->w,0,pos);
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winnstr(form->w,bp,check_len);
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found_content =
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After_Last_Non_Pad_Position(bp,check_len,field->pad);
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if (found_content==bp)
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pos += field->cols;
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else
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{
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result = TRUE;
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break;
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}
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}
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}
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else
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{
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pos = form->toprow + field->rows;
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while (pos < field->drows)
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{
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cursor_moved = TRUE;
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wmove(form->w,pos,0);
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pos++;
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winnstr(form->w,bp,field->cols);
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found_content =
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After_Last_Non_Pad_Position(bp,field->cols,field->pad);
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if (found_content!=bp)
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{
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result = TRUE;
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break;
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}
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}
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}
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if (large_buffer)
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free(bp);
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if (cursor_moved)
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wmove(form->w,form->currow,form->curcol);
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}
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return(result);
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}
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/* frm_data.c ends here */
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