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1.1 root 1: /*
2: * Copyright (C) 2006 Michael Brown <[email protected]>.
3: *
4: * This program is free software; you can redistribute it and/or
5: * modify it under the terms of the GNU General Public License as
6: * published by the Free Software Foundation; either version 2 of the
7: * License, or any later version.
8: *
9: * This program is distributed in the hope that it will be useful, but
10: * WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12: * General Public License for more details.
13: *
14: * You should have received a copy of the GNU General Public License
15: * along with this program; if not, write to the Free Software
16: * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17: */
18:
19: FILE_LICENCE ( GPL2_OR_LATER );
20:
21: #include <assert.h>
22: #include <string.h>
23: #include <ipxe/keys.h>
24: #include <ipxe/editstring.h>
25:
26: /** @file
27: *
28: * Editable strings
29: *
30: */
31:
32: static void insert_delete ( struct edit_string *string, size_t delete_len,
33: const char *insert_text )
34: __attribute__ (( nonnull (1) ));
35: static void insert_character ( struct edit_string *string,
36: unsigned int character ) __nonnull;
37: static void delete_character ( struct edit_string *string ) __nonnull;
38: static void backspace ( struct edit_string *string ) __nonnull;
39: static void kill_eol ( struct edit_string *string ) __nonnull;
40:
41: /**
42: * Insert and/or delete text within an editable string
43: *
44: * @v string Editable string
45: * @v delete_len Length of text to delete from current cursor position
46: * @v insert_text Text to insert at current cursor position, or NULL
47: */
48: static void insert_delete ( struct edit_string *string, size_t delete_len,
49: const char *insert_text ) {
50: size_t old_len, max_delete_len, insert_len, max_insert_len, new_len;
51:
52: /* Calculate lengths */
53: old_len = strlen ( string->buf );
54: assert ( string->cursor <= old_len );
55: max_delete_len = ( old_len - string->cursor );
56: if ( delete_len > max_delete_len )
57: delete_len = max_delete_len;
58: insert_len = ( insert_text ? strlen ( insert_text ) : 0 );
59: max_insert_len = ( ( string->len - 1 ) - ( old_len - delete_len ) );
60: if ( insert_len > max_insert_len )
61: insert_len = max_insert_len;
62: new_len = ( old_len - delete_len + insert_len );
63:
64: /* Fill in edit history */
65: string->mod_start = string->cursor;
66: string->mod_end = ( ( new_len > old_len ) ? new_len : old_len );
67:
68: /* Move data following the cursor */
69: memmove ( ( string->buf + string->cursor + insert_len ),
70: ( string->buf + string->cursor + delete_len ),
71: ( max_delete_len + 1 - delete_len ) );
72:
73: /* Copy inserted text to cursor position */
74: memcpy ( ( string->buf + string->cursor ), insert_text, insert_len );
75: string->cursor += insert_len;
76: }
77:
78: /**
79: * Insert character at current cursor position
80: *
81: * @v string Editable string
82: * @v character Character to insert
83: */
84: static void insert_character ( struct edit_string *string,
85: unsigned int character ) {
86: char insert_text[2] = { character, '\0' };
87: insert_delete ( string, 0, insert_text );
88: }
89:
90: /**
91: * Delete character at current cursor position
92: *
93: * @v string Editable string
94: */
95: static void delete_character ( struct edit_string *string ) {
96: insert_delete ( string, 1, NULL );
97: }
98:
99: /**
100: * Delete character to left of current cursor position
101: *
102: * @v string Editable string
103: */
104: static void backspace ( struct edit_string *string ) {
105: if ( string->cursor > 0 ) {
106: string->cursor--;
107: delete_character ( string );
108: }
109: }
110:
111: /**
112: * Delete to end of line
113: *
114: * @v string Editable string
115: */
116: static void kill_eol ( struct edit_string *string ) {
117: insert_delete ( string, ~( ( size_t ) 0 ), NULL );
118: }
119:
120: /**
121: * Replace editable string
122: *
123: * @v string Editable string
124: * @v replacement Replacement string
125: */
126: void replace_string ( struct edit_string *string, const char *replacement ) {
127: string->cursor = 0;
128: insert_delete ( string, ~( ( size_t ) 0 ), replacement );
129: }
130:
131: /**
132: * Edit editable string
133: *
134: * @v string Editable string
135: * @v key Key pressed by user
136: * @ret key Key returned to application, or zero
137: *
138: * Handles keypresses and updates the content of the editable string.
139: * Basic line editing facilities (delete/insert/cursor) are supported.
140: * If edit_string() understands and uses the keypress it will return
141: * zero, otherwise it will return the original key.
142: *
143: * This function does not update the display in any way.
144: *
145: * The string's edit history will be updated to allow the caller to
146: * efficiently bring the display into sync with the string content.
147: */
148: int edit_string ( struct edit_string *string, int key ) {
149: int retval = 0;
150: size_t len = strlen ( string->buf );
151:
152: /* Prepare edit history */
153: string->last_cursor = string->cursor;
154: string->mod_start = string->cursor;
155: string->mod_end = string->cursor;
156:
157: /* Interpret key */
158: if ( ( key >= 0x20 ) && ( key <= 0x7e ) ) {
159: /* Printable character; insert at current position */
160: insert_character ( string, key );
161: } else switch ( key ) {
162: case KEY_BACKSPACE:
163: /* Backspace */
164: backspace ( string );
165: break;
166: case KEY_DC:
167: case CTRL_D:
168: /* Delete character */
169: delete_character ( string );
170: break;
171: case CTRL_K:
172: /* Delete to end of line */
173: kill_eol ( string );
174: break;
175: case KEY_HOME:
176: case CTRL_A:
177: /* Start of line */
178: string->cursor = 0;
179: break;
180: case KEY_END:
181: case CTRL_E:
182: /* End of line */
183: string->cursor = len;
184: break;
185: case KEY_LEFT:
186: case CTRL_B:
187: /* Cursor left */
188: if ( string->cursor > 0 )
189: string->cursor--;
190: break;
191: case KEY_RIGHT:
192: case CTRL_F:
193: /* Cursor right */
194: if ( string->cursor < len )
195: string->cursor++;
196: break;
197: default:
198: retval = key;
199: break;
200: }
201:
202: return retval;
203: }
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