/**************************************************************************** * 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 */