1 /* $OpenBSD: frm_data.c,v 1.9 2023/10/17 09:52:10 nicm Exp $ */
2 /****************************************************************************
3 * Copyright 2020,2021 Thomas E. Dickey *
4 * Copyright 1998-2010,2013 Free Software Foundation, Inc. *
5 * *
6 * Permission is hereby granted, free of charge, to any person obtaining a *
7 * copy of this software and associated documentation files (the *
8 * "Software"), to deal in the Software without restriction, including *
9 * without limitation the rights to use, copy, modify, merge, publish, *
10 * distribute, distribute with modifications, sublicense, and/or sell *
11 * copies of the Software, and to permit persons to whom the Software is *
12 * furnished to do so, subject to the following conditions: *
13 * *
14 * The above copyright notice and this permission notice shall be included *
15 * in all copies or substantial portions of the Software. *
16 * *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
24 * *
25 * Except as contained in this notice, the name(s) of the above copyright *
26 * holders shall not be used in advertising or otherwise to promote the *
27 * sale, use or other dealings in this Software without prior written *
28 * authorization. *
29 ****************************************************************************/
30
31 /****************************************************************************
32 * Author: Juergen Pfeifer, 1995,1997 *
33 ****************************************************************************/
34
35 #include "form.priv.h"
36
37 MODULE_ID("$Id: frm_data.c,v 1.9 2023/10/17 09:52:10 nicm Exp $")
38
39 /*---------------------------------------------------------------------------
40 | Facility : libnform
41 | Function : bool data_behind(const FORM *form)
42 |
43 | Description : Check for off-screen data behind. This is nearly trivial
44 | because the beginning of a field is fixed.
45 |
46 | Return Values : TRUE - there are off-screen data behind
47 | FALSE - there are no off-screen data behind
48 +--------------------------------------------------------------------------*/
FORM_EXPORT(bool)49 FORM_EXPORT(bool)
50 data_behind(const FORM *form)
51 {
52 bool result = FALSE;
53
54 T((T_CALLED("data_behind(%p)"), (const void *)form));
55
56 if (form && (form->status & _POSTED) && form->current)
57 {
58 FIELD *field;
59
60 field = form->current;
61 if (!Single_Line_Field(field))
62 {
63 result = (form->toprow == 0) ? FALSE : TRUE;
64 }
65 else
66 {
67 result = (form->begincol == 0) ? FALSE : TRUE;
68 }
69 }
70 returnBool(result);
71 }
72
73 /*---------------------------------------------------------------------------
74 | Facility : libnform
75 | Function : static char * Only_Padding(
76 | WINDOW *w,
77 | int len,
78 | int pad)
79 |
80 | Description : Test if 'length' cells starting at the current position
81 | contain a padding character.
82 |
83 | Return Values : true if only padding cells are found
84 +--------------------------------------------------------------------------*/
85 NCURSES_INLINE static bool
Only_Padding(WINDOW * w,int len,int pad)86 Only_Padding(WINDOW *w, int len, int pad)
87 {
88 bool result = TRUE;
89 int y, x, j;
90 FIELD_CELL cell;
91
92 getyx(w, y, x);
93 for (j = 0; j < len; ++j)
94 {
95 if (wmove(w, y, x + j) != ERR)
96 {
97 #if USE_WIDEC_SUPPORT
98 if (win_wch(w, &cell) != ERR)
99 {
100 if ((chtype)CharOf(cell) != ChCharOf(pad)
101 || cell.chars[1] != 0)
102 {
103 result = FALSE;
104 break;
105 }
106 }
107 #else
108 cell = (FIELD_CELL)winch(w);
109 if (ChCharOf(cell) != ChCharOf(pad))
110 {
111 result = FALSE;
112 break;
113 }
114 #endif
115 }
116 else
117 {
118 /* if an error, return true: no non-padding text found */
119 break;
120 }
121 }
122 /* no need to reset the cursor position; caller does this */
123 return result;
124 }
125
126 /*---------------------------------------------------------------------------
127 | Facility : libnform
128 | Function : bool data_ahead(const FORM *form)
129 |
130 | Description : Check for off-screen data ahead. This is more difficult
131 | because a dynamic field has a variable end.
132 |
133 | Return Values : TRUE - there are off-screen data ahead
134 | FALSE - there are no off-screen data ahead
135 +--------------------------------------------------------------------------*/
136 FORM_EXPORT(bool)
data_ahead(const FORM * form)137 data_ahead(const FORM *form)
138 {
139 bool result = FALSE;
140
141 T((T_CALLED("data_ahead(%p)"), (const void *)form));
142
143 if (form && (form->status & _POSTED) && form->current)
144 {
145 FIELD *field;
146 bool cursor_moved = FALSE;
147 int pos;
148
149 field = form->current;
150 assert(form->w);
151
152 if (Single_Line_Field(field))
153 {
154 pos = form->begincol + field->cols;
155 while (pos < field->dcols)
156 {
157 int check_len = field->dcols - pos;
158
159 if (check_len >= field->cols)
160 check_len = field->cols;
161 cursor_moved = TRUE;
162 wmove(form->w, 0, pos);
163 if (Only_Padding(form->w, check_len, field->pad))
164 pos += field->cols;
165 else
166 {
167 result = TRUE;
168 break;
169 }
170 }
171 }
172 else
173 {
174 pos = form->toprow + field->rows;
175 while (pos < field->drows)
176 {
177 cursor_moved = TRUE;
178 wmove(form->w, pos, 0);
179 pos++;
180 if (!Only_Padding(form->w, field->cols, field->pad))
181 {
182 result = TRUE;
183 break;
184 }
185 }
186 }
187
188 if (cursor_moved)
189 wmove(form->w, form->currow, form->curcol);
190 }
191 returnBool(result);
192 }
193
194 /* frm_data.c ends here */
195