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 +--------------------------------------------------------------------------*/ 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 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) 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