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Start of generic editable string support
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@ -144,7 +144,7 @@ SRCDIRS += drivers/bitbash
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SRCDIRS += interface/pxe
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SRCDIRS += tests
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SRCDIRS += crypto
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SRCDIRS += hci/mucurses
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SRCDIRS += hci hci/mucurses
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SRCDIRS += commandline
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SRCDIRS += commandline/commands
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159
src/hci/editstring.c
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159
src/hci/editstring.c
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/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <assert.h>
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#include <string.h>
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#include <gpxe/editstring.h>
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/** @file
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*
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* Editable strings
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*
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*/
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/**
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* Insert and/or delete text within an editable string
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*
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* @v string Editable string
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* @v delete_len Length of text to delete from current cursor position
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* @v insert_text Text to insert at current cursor position, or NULL
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*/
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static void insert_delete ( struct edit_string *string, size_t delete_len,
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const char *insert_text ) {
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size_t old_len, max_delete_len, insert_len, max_insert_len;
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/* Calculate lengths */
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old_len = strlen ( string->buf );
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assert ( string->cursor <= old_len );
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max_delete_len = ( old_len - string->cursor );
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if ( delete_len > max_delete_len )
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delete_len = max_delete_len;
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insert_len = ( insert_text ? strlen ( insert_text ) : 0 );
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max_insert_len = ( ( string->len - 1 ) - ( old_len - delete_len ) );
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if ( insert_len > max_insert_len )
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insert_len = max_insert_len;
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/* Move data following the cursor */
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memmove ( ( string->buf + string->cursor + insert_len ),
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( string->buf + string->cursor + delete_len ),
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( max_delete_len + 1 - delete_len ) );
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/* Copy inserted text to cursor position */
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memcpy ( ( string->buf + string->cursor ), insert_text, insert_len );
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string->cursor += insert_len;
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}
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/**
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* Insert character at current cursor position
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*
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* @v string Editable string
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* @v character Character to insert
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*/
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static void insert_character ( struct edit_string *string,
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unsigned int character ) {
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char insert_text[2] = { character, '\0' };
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insert_delete ( string, 0, insert_text );
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}
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/**
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* Delete character at current cursor position
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*
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* @v string Editable string
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*/
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static void delete_character ( struct edit_string *string ) {
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insert_delete ( string, 1, NULL );
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}
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/**
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* Delete character to left of current cursor position
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*
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* @v string Editable string
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*/
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static void backspace ( struct edit_string *string ) {
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if ( string->cursor > 0 ) {
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string->cursor--;
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delete_character ( string );
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}
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}
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/**
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* Delete to end of line
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*
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* @v string Editable string
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*/
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static void kill_eol ( struct edit_string *string ) {
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insert_delete ( string, ~( ( size_t ) 0 ), NULL );
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}
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/**
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* Edit editable string
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*
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* @v string Editable string
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* @v key Key pressed by user
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* @ret key Key returned to application, or zero
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*
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* Handles keypresses and updates the content of the editable string.
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* Basic line editing facilities (delete/insert/cursor) are supported.
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* If edit_string() understands and uses the keypress it will return
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* zero, otherwise it will return the original key.
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*
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* This function does not update the display in any way.
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*/
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int edit_string ( struct edit_string *string, int key ) {
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int retval = 0;
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if ( ( key >= 0x20 ) && ( key <= 0x7e ) ) {
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/* Printable character; insert at current position */
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insert_character ( string, key );
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} else switch ( key ) {
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case 0x08: /* Ctrl-H */
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/* Backspace */
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backspace ( string );
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break;
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case 0x04: /* Ctrl-D */
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/* Delete character */
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delete_character ( string );
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break;
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case 0x0b: /* Ctrl-K */
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kill_eol ( string );
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break;
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case 0x01: /* Ctrl-A */
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/* Start of line */
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string->cursor = 0;
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break;
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case 0x05: /* Ctrl-E */
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/* End of line */
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string->cursor = strlen ( string->buf );
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break;
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case 0x02: /* Ctrl-B */
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/* Cursor left */
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if ( string->cursor > 0 )
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string->cursor--;
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break;
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case 0x06: /* Ctrl-F */
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/* Cursor right */
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if ( string->cursor < ( string->len - 1 ) )
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string->cursor++;
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break;
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default:
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retval = key;
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break;
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}
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return retval;
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}
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22
src/include/gpxe/editstring.h
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22
src/include/gpxe/editstring.h
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@ -0,0 +1,22 @@
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#ifndef _EDITSTRING_H
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#define _EDITSTRING_H
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/** @file
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*
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* Editable strings
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*
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*/
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/** An editable string */
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struct edit_string {
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/** Buffer for string */
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char *buf;
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/** Size of buffer (including terminating NUL) */
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size_t len;
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/** Cursor position */
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unsigned int cursor;
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};
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extern int edit_string ( struct edit_string *string, int key );
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#endif /* _EDITSTRING_H */
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