1 /****************************************************************************
2 * Copyright 2020,2021 Thomas E. Dickey *
3 * Copyright 1998-2010,2013 Free Software Foundation, Inc. *
4 * *
5 * Permission is hereby granted, free of charge, to any person obtaining a *
6 * copy of this software and associated documentation files (the *
7 * "Software"), to deal in the Software without restriction, including *
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9 * distribute, distribute with modifications, sublicense, and/or sell *
10 * copies of the Software, and to permit persons to whom the Software is *
11 * furnished to do so, subject to the following conditions: *
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13 * The above copyright notice and this permission notice shall be included *
14 * in all copies or substantial portions of the Software. *
15 * *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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24 * Except as contained in this notice, the name(s) of the above copyright *
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28 ****************************************************************************/
29
30 /****************************************************************************
31 * Author: Juergen Pfeifer, 1995,1997 *
32 ****************************************************************************/
33
34 #include "form.priv.h"
35
36 MODULE_ID("$Id: frm_data.c,v 1.21 2021/06/17 21:11:08 tom Exp $")
37
38 /*---------------------------------------------------------------------------
39 | Facility : libnform
40 | Function : bool data_behind(const FORM *form)
41 |
42 | Description : Check for off-screen data behind. This is nearly trivial
43 | because the beginning of a field is fixed.
44 |
45 | Return Values : TRUE - there are off-screen data behind
46 | FALSE - there are no off-screen data behind
47 +--------------------------------------------------------------------------*/
FORM_EXPORT(bool)48 FORM_EXPORT(bool)
49 data_behind(const FORM *form)
50 {
51 bool result = FALSE;
52
53 T((T_CALLED("data_behind(%p)"), (const void *)form));
54
55 if (form && (form->status & _POSTED) && form->current)
56 {
57 FIELD *field;
58
59 field = form->current;
60 if (!Single_Line_Field(field))
61 {
62 result = (form->toprow == 0) ? FALSE : TRUE;
63 }
64 else
65 {
66 result = (form->begincol == 0) ? FALSE : TRUE;
67 }
68 }
69 returnBool(result);
70 }
71
72 /*---------------------------------------------------------------------------
73 | Facility : libnform
74 | Function : static char * Only_Padding(
75 | WINDOW *w,
76 | int len,
77 | int pad)
78 |
79 | Description : Test if 'length' cells starting at the current position
80 | contain a padding character.
81 |
82 | Return Values : true if only padding cells are found
83 +--------------------------------------------------------------------------*/
84 NCURSES_INLINE static bool
Only_Padding(WINDOW * w,int len,int pad)85 Only_Padding(WINDOW *w, int len, int pad)
86 {
87 bool result = TRUE;
88 int y, x, j;
89 FIELD_CELL cell;
90
91 getyx(w, y, x);
92 for (j = 0; j < len; ++j)
93 {
94 if (wmove(w, y, x + j) != ERR)
95 {
96 #if USE_WIDEC_SUPPORT
97 if (win_wch(w, &cell) != ERR)
98 {
99 if ((chtype)CharOf(cell) != ChCharOf(pad)
100 || cell.chars[1] != 0)
101 {
102 result = FALSE;
103 break;
104 }
105 }
106 #else
107 cell = (FIELD_CELL)winch(w);
108 if (ChCharOf(cell) != ChCharOf(pad))
109 {
110 result = FALSE;
111 break;
112 }
113 #endif
114 }
115 else
116 {
117 /* if an error, return true: no non-padding text found */
118 break;
119 }
120 }
121 /* no need to reset the cursor position; caller does this */
122 return result;
123 }
124
125 /*---------------------------------------------------------------------------
126 | Facility : libnform
127 | Function : bool data_ahead(const FORM *form)
128 |
129 | Description : Check for off-screen data ahead. This is more difficult
130 | because a dynamic field has a variable end.
131 |
132 | Return Values : TRUE - there are off-screen data ahead
133 | FALSE - there are no off-screen data ahead
134 +--------------------------------------------------------------------------*/
135 FORM_EXPORT(bool)
data_ahead(const FORM * form)136 data_ahead(const FORM *form)
137 {
138 bool result = FALSE;
139
140 T((T_CALLED("data_ahead(%p)"), (const void *)form));
141
142 if (form && (form->status & _POSTED) && form->current)
143 {
144 FIELD *field;
145 bool cursor_moved = FALSE;
146 int pos;
147
148 field = form->current;
149 assert(form->w);
150
151 if (Single_Line_Field(field))
152 {
153 pos = form->begincol + field->cols;
154 while (pos < field->dcols)
155 {
156 int check_len = field->dcols - pos;
157
158 if (check_len >= field->cols)
159 check_len = field->cols;
160 cursor_moved = TRUE;
161 wmove(form->w, 0, pos);
162 if (Only_Padding(form->w, check_len, field->pad))
163 pos += field->cols;
164 else
165 {
166 result = TRUE;
167 break;
168 }
169 }
170 }
171 else
172 {
173 pos = form->toprow + field->rows;
174 while (pos < field->drows)
175 {
176 cursor_moved = TRUE;
177 wmove(form->w, pos, 0);
178 pos++;
179 if (!Only_Padding(form->w, field->cols, field->pad))
180 {
181 result = TRUE;
182 break;
183 }
184 }
185 }
186
187 if (cursor_moved)
188 wmove(form->w, form->currow, form->curcol);
189 }
190 returnBool(result);
191 }
192
193 /* frm_data.c ends here */
194