8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
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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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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <console.h>
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#include <ipxe/keys.h>
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#include <ipxe/editstring.h>
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#include <readline/readline.h>
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/** @file
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*
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* Minimal readline
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*
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*/
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#define READLINE_MAX 256
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static void sync_console ( struct edit_string *string ) __nonnull;
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/**
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* Synchronise console with edited string
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*
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* @v string Editable string
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*/
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static void sync_console ( struct edit_string *string ) {
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unsigned int mod_start = string->mod_start;
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unsigned int mod_end = string->mod_end;
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unsigned int cursor = string->last_cursor;
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size_t len = strlen ( string->buf );
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/* Expand region back to old cursor position if applicable */
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if ( mod_start > string->last_cursor )
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mod_start = string->last_cursor;
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/* Expand region forward to new cursor position if applicable */
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if ( mod_end < string->cursor )
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mod_end = string->cursor;
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/* Backspace to start of region */
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while ( cursor > mod_start ) {
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putchar ( '\b' );
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cursor--;
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}
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/* Print modified region */
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while ( cursor < mod_end ) {
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putchar ( ( cursor >= len ) ? ' ' : string->buf[cursor] );
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cursor++;
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}
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/* Backspace to new cursor position */
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while ( cursor > string->cursor ) {
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putchar ( '\b' );
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cursor--;
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}
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}
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/**
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* Read line from console
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*
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* @v prompt Prompt string
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* @ret line Line read from console (excluding terminating newline)
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*
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* The returned line is allocated with malloc(); the caller must
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* eventually call free() to release the storage.
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*/
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char * readline ( const char *prompt ) {
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char buf[READLINE_MAX];
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struct edit_string string;
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int key;
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char *line;
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if ( prompt )
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printf ( "%s", prompt );
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memset ( &string, 0, sizeof ( string ) );
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string.buf = buf;
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string.len = sizeof ( buf );
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buf[0] = '\0';
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while ( 1 ) {
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key = edit_string ( &string, getkey() );
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sync_console ( &string );
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switch ( key ) {
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case CR:
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case LF:
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putchar ( '\n' );
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line = strdup ( buf );
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if ( ! line )
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printf ( "Out of memory\n" );
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return line;
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case CTRL_C:
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putchar ( '\n' );
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return NULL;
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default:
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/* Do nothing */
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break;
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}
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}
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}
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