blob/src command_hist.c,1.1,1.2

[Stefan E. <se...@us...>]

Update of /cvsroot/blob/blob/src
In directory usw-pr-cvs1:/tmp/cvs-serv24606

Modified Files:
	command_hist.c 
Log Message:
- simple command line history


Index: command_hist.c
===================================================================
RCS file: /cvsroot/blob/blob/src/command_hist.c,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -r1.1 -r1.2
--- command_hist.c	2001/10/05 11:48:11	1.1
+++ command_hist.c	2001/10/05 11:53:46	1.2
@@ -0,0 +1,260 @@
+/**********************************************************************
+ *	Command history
+ *
+ *	AUTOR:	SELETZ
+ *
+ *	Implements a simple command history
+ *
+ * Copyright (C) 2001 Stefan Eletzhofer <ste...@ww...>
+ *
+ * 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
+ * (at your option) 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ident "$Id$"
+
+/**********************************************************************
+ * Includes
+ */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "command.h"
+#include "errno.h"
+#include "init.h"
+#include "serial.h"
+#include "time.h"
+#include "types.h"
+#include "util.h"
+
+/**********************************************************************
+ * Defines / Makros
+ */
+
+#define CMDHIST_DEBUG 0
+
+#define MAX_HIST	32
+
+/**********************************************************************
+ * Programmglobale Variable
+ */
+
+/**********************************************************************
+ * Modulglobale Variable
+ */
+
+static int	is_initialized		= 0;
+static int	cmdhist_entries		= 0;
+static int	cmdhist_read		= 0;
+static int	cmdhist_write		= 0;
+static char cmdhistory[MAX_HIST][MAX_COMMANDLINE_LENGTH];
+
+
+/**********************************************************************
+ * Prototypen
+ */
+
+/**********************************************************************
+ * Exportierte Funktionen
+ */
+
+/*********************************************************************
+ * cmdhist_init
+ *
+ * AUTOR:		SELETZ
+ * REVISED:
+ *
+ * Initializes this module
+ *
+ */
+int cmdhist_init( void )
+{
+	int		i;
+
+	cmdhist_read = 0;
+	cmdhist_write = 0;
+	cmdhist_entries = 0;
+
+	i=MAX_HIST - 1;
+	while ( i-- ) {
+		cmdhistory[i][0]=0;
+	}
+
+	is_initialized = 1;
+	return 0;
+}
+
+
+/*********************************************************************
+ * cmd_push
+ *
+ * AUTOR:		SELETZ
+ * REVISED:
+ *
+ * Push a command to the history buffer
+ *
+ */
+int cmdhist_push( char *cmd )
+{
+	if ( !is_initialized ) {
+		cmdhist_init();
+	}
+
+	if ( !cmd )
+		return -EINVAL;
+
+	if ( strlen( cmd ) > MAX_COMMANDLINE_LENGTH )
+		return -EINVAL;
+
+	if ( strlen( cmd ) == 0 )
+		return 0;
+
+	strcpy( cmdhistory[ cmdhist_write ], cmd );
+
+	cmdhist_write ++;
+	cmdhist_write = cmdhist_write % MAX_HIST;
+
+	if ( cmdhist_entries < MAX_HIST )
+		cmdhist_entries++;
+
+#if CMDHIST_DEBUG
+	SerialOutputString( "e=" );
+	SerialOutputDec( cmdhist_entries );
+	SerialOutputString( " r=" );
+	SerialOutputDec( cmdhist_read );
+	SerialOutputString( " w=" );
+	SerialOutputDec( cmdhist_write );
+	SerialOutputString( "\n" );
+#endif
+
+	return 0;
+}
+
+
+/*********************************************************************
+ * cmdhist_reset
+ *
+ * AUTOR:		SELETZ
+ * REVISED:
+ *
+ * Resets read ptr
+ *
+ */
+int cmdhist_reset( void )
+{
+	cmdhist_read = cmdhist_write;
+
+	return 0;
+}
+
+
+
+/*********************************************************************
+ * cmd_next
+ *
+ * AUTOR:		seletz
+ * REVISED:
+ *
+ * Gets next command in history
+ *
+ */
+int cmdhist_next( char **cmd )
+{
+	int ptr;
+
+	if ( !is_initialized ) {
+		cmdhist_init();
+	}
+
+	if ( !cmdhist_entries )
+		return -EINVAL;
+
+	if ( !cmd )
+		return -EINVAL;
+
+	ptr = cmdhist_read;
+	
+	if ( ptr == 0 ) {
+		if ( cmdhist_entries != MAX_HIST )
+			return -EINVAL;
+		ptr = MAX_HIST - 1;
+	} else {
+		ptr--;
+	}
+
+	if ( !cmdhistory[ptr][0] )
+		return -EINVAL;
+
+	*cmd = cmdhistory[ptr];
+
+	cmdhist_read = ptr;
+
+#if CMDHIST_DEBUG
+	SerialOutputString( "e=" );
+	SerialOutputDec( cmdhist_entries );
+	SerialOutputString( " r=" );
+	SerialOutputDec( cmdhist_read );
+	SerialOutputString( " w=" );
+	SerialOutputDec( cmdhist_write );
+	SerialOutputString( "\n" );
+#endif
+
+	return 0;
+}
+
+
+/*********************************************************************
+ * cmd_prev
+ *
+ * AUTOR:		SELETZ
+ * REVISED:
+ *
+ * Gets previous command from history
+ *
+ */
+int cmdhist_prev( char **cmd )
+{
+	int ptr;
+
+	if ( !is_initialized ) {
+		cmdhist_init();
+	}
+
+	if ( !cmd )
+		return -EINVAL;
+
+	if ( !cmdhist_entries )
+		return -EINVAL;
+	
+	ptr = cmdhist_read + 1;
+	ptr = ptr % MAX_HIST;
+
+	if ( ptr == cmdhist_write )
+		return -EINVAL;
+
+	if ( !cmdhistory[ptr][0] )
+		return -EINVAL;
+
+	*cmd = cmdhistory[ptr];
+
+	cmdhist_read = ptr;
+
+	return 0;
+}
+
+/**********************************************************************
+ * Statische Funktionen
+ */