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-rw-r--r--Source/CursesDialog/form/frm_data.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/Source/CursesDialog/form/frm_data.c b/Source/CursesDialog/form/frm_data.c
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+++ b/Source/CursesDialog/form/frm_data.c
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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 */