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/*
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <console.h>
#include <gpxe/keys.h>
#include <gpxe/editstring.h>
#include <readline/readline.h>
/** @file
*
* Minimal readline
*
*/
#define READLINE_MAX 256
static void sync_console ( struct edit_string *string ) __nonnull;
/**
* Synchronise console with edited string
*
* @v string Editable string
*/
static void sync_console ( struct edit_string *string ) {
unsigned int mod_start = string->mod_start;
unsigned int mod_end = string->mod_end;
unsigned int cursor = string->last_cursor;
size_t len = strlen ( string->buf );
/* Expand region back to old cursor position if applicable */
if ( mod_start > string->last_cursor )
mod_start = string->last_cursor;
/* Expand region forward to new cursor position if applicable */
if ( mod_end < string->cursor )
mod_end = string->cursor;
/* Backspace to start of region */
while ( cursor > mod_start ) {
putchar ( '\b' );
cursor--;
}
/* Print modified region */
while ( cursor < mod_end ) {
putchar ( ( cursor >= len ) ? ' ' : string->buf[cursor] );
cursor++;
}
/* Backspace to new cursor position */
while ( cursor > string->cursor ) {
putchar ( '\b' );
cursor--;
}
}
/**
* Read line from console
*
* @v prompt Prompt string
* @ret line Line read from console (excluding terminating newline)
*
* The returned line is allocated with malloc(); the caller must
* eventually call free() to release the storage.
*/
char * readline ( const char *prompt ) {
char buf[READLINE_MAX];
struct edit_string string;
int key;
char *line;
if ( prompt )
printf ( "%s", prompt );
memset ( &string, 0, sizeof ( string ) );
string.buf = buf;
string.len = sizeof ( buf );
buf[0] = '\0';
while ( 1 ) {
key = edit_string ( &string, getkey() );
sync_console ( &string );
switch ( key ) {
case CR:
case LF:
putchar ( '\n' );
line = strdup ( buf );
if ( ! line )
printf ( "Out of memory\n" );
return line;
case CTRL_C:
putchar ( '\n' );
return NULL;
default:
/* Do nothing */
break;
}
}
}
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