Add gPXE into the source tree; build unified imagesyslinux-3.70-pre7

1 files changed, 117 insertions, 0 deletions

diff --git a/gpxe/src/hci/readline.c b/gpxe/src/hci/readline.c
new file mode 100644
index 00000000..ff7a7679
--- /dev/null
+++ b/gpxe/src/hci/readline.c
@@ -0,0 +1,117 @@
+/*
+ * 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.
+ */
+
+#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;
+		}
+	}
+}